Add podcasts support WIP

CMakeLists.txt

@@ -338,6 +338,12 @@ if(WIN32)
   add_definitions(-DSTATIC_GETOPT -D_UNICODE)
 endif()
 
+if(BUILD_WITH_QT6)
+  pkg_check_modules(LIBMYGPO libmygpo-qt6)
+else()
+  pkg_check_modules(LIBMYGPO libmygpo-qt5)
+endif()
+
 if(WIN32 AND NOT MSVC)
   # RC compiler
   string(REPLACE "gcc" "windres" CMAKE_RC_COMPILER_INIT ${CMAKE_C_COMPILER})
@@ -451,6 +457,8 @@ optional_component(EBUR128 ON "EBU R 128 loudness normalization"
   DEPENDS "gstreamer" HAVE_GSTREAMER
 )
 
+optional_component(PODCASTS ON "Podcasts support" DEPENDS "libmygpo" LIBMYGPO_FOUND)
+
 if(APPLE OR WIN32)
   set(USE_BUNDLE_DEFAULT ON)
 else()

src/CMakeLists.txt

@@ -939,11 +939,75 @@ optional_source(HAVE_MOODBAR
     settings/moodbarsettingspage.ui
 )
 
+
 # EBU R 128
 optional_source(HAVE_EBUR128
   SOURCES engine/ebur128analysis.cpp
 )
 
+optional_source(HAVE_PODCASTS
+  SOURCES
+    podcasts/gpoddersync.cpp
+    podcasts/gpoddertoptagsmodel.cpp
+    podcasts/gpoddertoptagspage.cpp
+    podcasts/itunessearchpage.cpp
+    podcasts/podcastbackend.cpp
+    podcasts/podcastservice.cpp
+    podcasts/podcast.cpp
+    podcasts/podcastdownloader.cpp
+    podcasts/podcastupdater.cpp
+    podcasts/podcastdeleter.cpp
+    podcasts/podcastdiscoverymodel.cpp
+    podcasts/podcastepisode.cpp
+    podcasts/podcastinfodialog.cpp
+    podcasts/podcastinfowidget.cpp
+    podcasts/podcastparser.cpp
+    podcasts/podcastservicemodel.cpp
+    podcasts/podcasturlloader.cpp
+    podcasts/gpoddersearchpage.cpp
+    podcasts/addpodcastbyurl.cpp
+    podcasts/addpodcastdialog.cpp
+    podcasts/addpodcastpage.cpp
+    podcasts/episodeinfowidget.cpp
+    podcasts/fixedopmlpage.cpp
+    settings/podcastsettingspage.cpp
+  HEADERS
+    podcasts/addpodcastbyurl.h
+    podcasts/addpodcastdialog.h
+    podcasts/addpodcastpage.h
+    podcasts/episodeinfowidget.h
+    podcasts/fixedopmlpage.h
+    podcasts/gpoddersync.h
+    podcasts/gpoddertoptagsmodel.h
+    podcasts/gpoddertoptagspage.h
+    podcasts/itunessearchpage.h
+    podcasts/opmlcontainer.h
+    podcasts/podcastbackend.h
+    podcasts/podcastdeleter.h
+    podcasts/podcastdiscoverymodel.h
+    podcasts/podcastdownloader.h
+    podcasts/podcastepisode.h
+    podcasts/podcast.h
+    podcasts/podcastinfodialog.h
+    podcasts/podcastinfowidget.h
+    podcasts/podcastparser.h
+    podcasts/podcastservice.h
+    podcasts/podcastservicemodel.h
+    podcasts/podcastupdater.h
+    podcasts/podcasturlloader.h
+    podcasts/gpoddersearchpage.h
+    settings/podcastsettingspage.h
+  UI
+    podcasts/addpodcastbyurl.ui
+    podcasts/addpodcastdialog.ui
+    podcasts/episodeinfowidget.ui
+    podcasts/itunessearchpage.ui
+    podcasts/podcastinfodialog.ui
+    podcasts/podcastinfowidget.ui
+    podcasts/gpoddersearchpage.ui
+    settings/podcastsettingspage.ui
+)
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/version.h.in ${CMAKE_CURRENT_BINARY_DIR}/version.h)
 
@@ -1059,6 +1123,10 @@ if(USE_TAGPARSER AND TAGPARSER_FOUND)
   link_directories(${TAGPARSER_LIBRARY_DIRS})
 endif()
 
+if(HAVE_PODCASTS)
+  link_directories(${LIBMYGPO_LIBRARY_DIRS})
+endif()
+
 if(HAVE_QTSPARKLE)
   link_directories(${QTSPARKLE_LIBRARY_DIRS})
 endif()
@@ -1214,6 +1282,11 @@ if(HAVE_LIBMTP)
   target_link_libraries(strawberry_lib PRIVATE ${LIBMTP_LIBRARIES})
 endif()
 
+if(HAVE_PODCASTS)
+  target_include_directories(strawberry_lib SYSTEM PRIVATE ${LIBMYGPO_INCLUDE_DIRS})
+  target_link_libraries(strawberry_lib PRIVATE ${LIBMYGPO_LIBRARIES})
+endif(HAVE_PODCASTS)
+
 if(APPLE)
   target_link_libraries(strawberry_lib PRIVATE
     "-framework AppKit"

src/config.h.in

@@ -33,6 +33,7 @@
 #cmakedefine HAVE_QOBUZ
 
 #cmakedefine HAVE_MOODBAR
+#cmakedefine HAVE_PODCASTS
 
 #cmakedefine HAVE_KEYSYMDEF_H
 #cmakedefine HAVE_XF86KEYSYM_H

src/core/application.cpp

@@ -102,7 +102,16 @@
 #include "radios/radioservices.h"
 #include "radios/radiobackend.h"
 
+#ifdef HAVE_PODCASTS
+#  include "podcasts/podcastbackend.h"
+#  include "podcasts/gpoddersync.h"
+#  include "podcasts/podcastdownloader.h"
+#  include "podcasts/podcastupdater.h"
+#  include "podcasts/podcastdeleter.h"
+#endif
+
 using std::make_shared;
+
 using namespace std::chrono_literals;
 
 class ApplicationImpl {
@@ -200,6 +209,21 @@ class ApplicationImpl {
 #ifdef HAVE_MOODBAR
         moodbar_loader_([app]() { return new MoodbarLoader(app); }),
         moodbar_controller_([app]() { return new MoodbarController(app); }),
+#endif
+#ifdef HAVE_PODCASTS
+        podcast_backend_([app]() {
+          PodcastBackend* backend = new PodcastBackend(app, app);
+          app->MoveToThread(backend, database_->thread());
+          return backend;
+        }),
+        gpodder_sync_([app]() { return new GPodderSync(app, app); }),
+        podcast_downloader_([app]() { return new PodcastDownloader(app, app); }),
+        podcast_updater_([app]() { return new PodcastUpdater(app, app); }),
+        podcast_deleter_([app]() {
+          PodcastDeleter* deleter = new PodcastDeleter(app, app);
+          app->MoveToNewThread(deleter);
+          return deleter;
+        }),
 #endif
         lastfm_import_([app]() { return new LastFMImport(app->network()); })
   {}
@@ -226,6 +250,13 @@ class ApplicationImpl {
 #ifdef HAVE_MOODBAR
   Lazy<MoodbarLoader> moodbar_loader_;
   Lazy<MoodbarController> moodbar_controller_;
+#endif
+#ifdef HAVE_PODCASTS
+  Lazy<PodcastBackend> podcast_backend_;
+  Lazy<GPodderSync> gpodder_sync_;
+  Lazy<PodcastDownloader> podcast_downloader_;
+  Lazy<PodcastUpdater> podcast_updater_;
+  Lazy<PodcastDeleter> podcast_deleter_;
 #endif
   Lazy<LastFMImport> lastfm_import_;
 
@@ -359,3 +390,10 @@ SharedPtr<LastFMImport> Application::lastfm_import() const { return p_->lastfm_i
 SharedPtr<MoodbarController> Application::moodbar_controller() const { return p_->moodbar_controller_.ptr(); }
 SharedPtr<MoodbarLoader> Application::moodbar_loader() const { return p_->moodbar_loader_.ptr(); }
 #endif
+#ifdef HAVE_PODCASTS
+PodcastBackend *Application::podcast_backend() const { return p_->podcast_backend_.get(); }
+GPodderSync *Application::gpodder_sync() const { return p_->gpodder_sync_.get(); }
+PodcastDownloader *Application::podcast_downloader() const { return p_->podcast_downloader_.get(); }
+PodcastUpdater *Application::podcast_updater() const { return p_->podcast_updater_.get(); }
+PodcastDeleter *Application::podcast_deleter() const { return p_->podcast_deleter_.get(); }
+#endif

src/core/application.h

@@ -64,6 +64,14 @@ class RadioServices;
 class MoodbarController;
 class MoodbarLoader;
 #endif
+#ifdef HAVE_PODCASTS
+class PodcastBackend;
+class GPodderSync;
+class PodcastDownloader;
+class PodcastUpdater;
+class PodcastDeleter;
+#endif
+
 
 class Application : public QObject {
   Q_OBJECT
@@ -104,6 +112,13 @@ class Application : public QObject {
   SharedPtr<MoodbarController> moodbar_controller() const;
   SharedPtr<MoodbarLoader> moodbar_loader() const;
 #endif
+#ifdef HAVE_PODCASTS
+  PodcastBackend *podcast_backend() const;
+  GPodderSync *gpodder_sync() const;
+  PodcastDownloader *podcast_downloader() const;
+  PodcastUpdater *podcast_updater() const;
+  PodcastDeleter *podcast_deleter() const;
+#endif
 
   SharedPtr<LastFMImport> lastfm_import() const;
 

src/podcasts/addpodcastbyurl.cpp

@@ -0,0 +1,116 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QString>
+#include <QUrl>
+#include <QClipboard>
+#include <QMessageBox>
+
+#include "core/iconloader.h"
+#include "podcastdiscoverymodel.h"
+#include "podcasturlloader.h"
+#include "addpodcastbyurl.h"
+#include "ui_addpodcastbyurl.h"
+
+AddPodcastByUrl::AddPodcastByUrl(Application *app, QWidget *parent)
+    : AddPodcastPage(app, parent),
+      ui_(new Ui_AddPodcastByUrl),
+      loader_(new PodcastUrlLoader(this)) {
+
+  ui_->setupUi(this);
+  QObject::connect(ui_->go, &QPushButton::clicked, this, &AddPodcastByUrl::GoClicked);
+  setWindowIcon(IconLoader::Load("podcast"));
+
+}
+
+AddPodcastByUrl::~AddPodcastByUrl() { delete ui_; }
+
+void AddPodcastByUrl::SetUrlAndGo(const QUrl &url) {
+
+  ui_->url->setText(url.toString());
+  GoClicked();
+
+}
+
+void AddPodcastByUrl::SetOpml(const OpmlContainer &opml) {
+
+  ui_->url->setText(opml.url.toString());
+  model()->clear();
+  model()->CreateOpmlContainerItems(opml, model()->invisibleRootItem());
+
+}
+
+void AddPodcastByUrl::GoClicked() {
+
+  emit Busy(true);
+  model()->clear();
+
+  PodcastUrlLoaderReply* reply = loader_->Load(ui_->url->text());
+  ui_->url->setText(reply->url().toString());
+
+  QObject::connect(reply, &PodcastUrlLoaderReply::Finished, this, [this, reply]() { RequestFinished(reply); });
+
+}
+
+void AddPodcastByUrl::RequestFinished(PodcastUrlLoaderReply *reply) {
+
+  reply->deleteLater();
+
+  emit Busy(false);
+
+  if (!reply->is_success()) {
+    QMessageBox::warning(this, tr("Failed to load podcast"), reply->error_text(), QMessageBox::Close);
+    return;
+  }
+
+  switch (reply->result_type()) {
+    case PodcastUrlLoaderReply::Type_Podcast:
+      for (const Podcast& podcast : reply->podcast_results()) {
+        model()->appendRow(model()->CreatePodcastItem(podcast));
+      }
+      break;
+
+    case PodcastUrlLoaderReply::Type_Opml:
+      model()->CreateOpmlContainerItems(reply->opml_results(), model()->invisibleRootItem());
+      break;
+  }
+
+}
+
+void AddPodcastByUrl::Show() {
+
+  ui_->url->setFocus();
+
+  const QClipboard *clipboard = QApplication::clipboard();
+  QStringList contents;
+  contents << clipboard->text(QClipboard::Selection) << clipboard->text(QClipboard::Clipboard);
+
+  for (const QString &content : contents) {
+    if (content.contains("://")) {
+      ui_->url->setText(content);
+      return;
+    }
+  }
+
+}

src/podcasts/addpodcastbyurl.h

@@ -0,0 +1,60 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ADDPODCASTBYURL_H
+#define ADDPODCASTBYURL_H
+
+#include <QObject>
+#include <QUrl>
+
+#include "addpodcastpage.h"
+#include "opmlcontainer.h"
+
+class Application;
+class AddPodcastPage;
+class PodcastUrlLoader;
+class PodcastUrlLoaderReply;
+class Ui_AddPodcastByUrl;
+
+class AddPodcastByUrl : public AddPodcastPage {
+  Q_OBJECT
+
+ public:
+  explicit AddPodcastByUrl(Application *app, QWidget *parent = nullptr);
+  ~AddPodcastByUrl();
+
+  void Show();
+
+  void SetOpml(const OpmlContainer &opml);
+  void SetUrlAndGo(const QUrl &url);
+
+ private slots:
+  void GoClicked();
+  void RequestFinished(PodcastUrlLoaderReply *reply);
+
+ private:
+  Ui_AddPodcastByUrl *ui_;
+  PodcastUrlLoader *loader_;
+};
+
+#endif  // ADDPODCASTBYURL_H

src/podcasts/addpodcastbyurl.ui

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AddPodcastByUrl</class>
+ <widget class="QWidget" name="AddPodcastByUrl">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>431</width>
+    <height>51</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Enter a URL</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>If you know the URL of a podcast, enter it below and press Go.</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLineEdit" name="url"/>
+     </item>
+     <item>
+      <widget class="QPushButton" name="go">
+       <property name="text">
+        <string>Go</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <connections>
+  <connection>
+   <sender>url</sender>
+   <signal>returnPressed()</signal>
+   <receiver>go</receiver>
+   <slot>click()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>109</x>
+     <y>24</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>429</x>
+     <y>49</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/podcasts/addpodcastdialog.cpp

@@ -0,0 +1,270 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QDialog>
+#include <QVariant>
+#include <QString>
+#include <QUrl>
+#include <QDir>
+#include <QFileDialog>
+#include <QTimer>
+#include <QPushButton>
+#include <QListWidget>
+#include <QItemSelectionModel>
+
+#include "core/application.h"
+#include "core/iconloader.h"
+#include "widgets/widgetfadehelper.h"
+#include "fixedopmlpage.h"
+#include "gpoddersearchpage.h"
+#include "gpoddertoptagspage.h"
+#include "itunessearchpage.h"
+#include "podcastbackend.h"
+#include "podcastdiscoverymodel.h"
+#include "addpodcastbyurl.h"
+#include "podcastinfowidget.h"
+#include "addpodcastdialog.h"
+#include "ui_addpodcastdialog.h"
+
+const char *AddPodcastDialog::kBbcOpmlUrl = "http://www.bbc.co.uk/podcasts.opml";
+const char *AddPodcastDialog::kCbcOpmlUrl = "http://cbc.ca/podcasts.opml";
+
+AddPodcastDialog::AddPodcastDialog(Application *app, QWidget *parent)
+    : QDialog(parent),
+      app_(app),
+      ui_(new Ui_AddPodcastDialog),
+      last_opml_path_(QDir::homePath()) {
+
+  ui_->setupUi(this);
+  ui_->details->SetApplication(app);
+  ui_->results->SetExpandOnReset(false);
+  ui_->results->SetAddOnDoubleClick(false);
+  ui_->results_stack->setCurrentWidget(ui_->results_page);
+
+  fader_ = new WidgetFadeHelper(ui_->details_scroll_area);
+
+  QObject::connect(ui_->provider_list, &QListWidget::currentRowChanged, this, &AddPodcastDialog::ChangePage);
+  QObject::connect(ui_->details, &PodcastInfoWidget::LoadingFinished, fader_, &WidgetFadeHelper::StartFade);
+  QObject::connect(ui_->results, &AutoExpandingTreeView::doubleClicked, this, &AddPodcastDialog::PodcastDoubleClicked);
+
+  // Create Add and Remove Podcast buttons
+  add_button_ = new QPushButton(IconLoader::Load("list-add"), tr("Add Podcast"), this);
+  add_button_->setEnabled(false);
+  connect(add_button_, &QPushButton::clicked, this, &AddPodcastDialog::AddPodcast);
+  ui_->button_box->addButton(add_button_, QDialogButtonBox::ActionRole);
+
+  remove_button_ = new QPushButton(IconLoader::Load("list-remove"), tr("Unsubscribe"), this);
+  remove_button_->setEnabled(false);
+  connect(remove_button_, &QPushButton::clicked, this, &AddPodcastDialog::RemovePodcast);
+  ui_->button_box->addButton(remove_button_, QDialogButtonBox::ActionRole);
+
+  QPushButton *settings_button = new QPushButton(IconLoader::Load("configure"), tr("Configure podcasts..."), this);
+  connect(settings_button, &QPushButton::clicked, this, &AddPodcastDialog::OpenSettingsPage);
+  ui_->button_box->addButton(settings_button, QDialogButtonBox::ResetRole);
+
+  // Create an Open OPML file button
+  QPushButton *open_opml_button = new QPushButton(IconLoader::Load("document-open"), tr("Open OPML file..."), this);
+  QObject::connect(open_opml_button, &QPushButton::clicked, this, &AddPodcastDialog::OpenOPMLFile);
+  ui_->button_box->addButton(open_opml_button, QDialogButtonBox::ResetRole);
+
+  // Add providers
+  by_url_page_ = new AddPodcastByUrl(app, this);
+  AddPage(by_url_page_);
+  AddPage(new FixedOpmlPage(QUrl(kBbcOpmlUrl), tr("BBC Podcasts"), IconLoader::Load("bbc"), app, this));
+  AddPage(new FixedOpmlPage(QUrl(kCbcOpmlUrl), tr("CBC Podcasts"), IconLoader::Load("cbc"), app, this));
+  AddPage(new GPodderTopTagsPage(app, this));
+  AddPage(new GPodderSearchPage(app, this));
+  AddPage(new ITunesSearchPage(app, this));
+
+  ui_->provider_list->setCurrentRow(0);
+}
+
+AddPodcastDialog::~AddPodcastDialog() { delete ui_; }
+
+void AddPodcastDialog::ShowWithUrl(const QUrl& url) {
+
+  by_url_page_->SetUrlAndGo(url);
+  ui_->provider_list->setCurrentRow(0);
+  show();
+
+}
+
+void AddPodcastDialog::ShowWithOpml(const OpmlContainer& opml) {
+
+  by_url_page_->SetOpml(opml);
+  ui_->provider_list->setCurrentRow(0);
+  show();
+
+}
+
+void AddPodcastDialog::AddPage(AddPodcastPage *page) {
+
+  pages_.append(page);
+  page_is_busy_.append(false);
+
+  ui_->stack->addWidget(page);
+  new QListWidgetItem(page->windowIcon(), page->windowTitle(), ui_->provider_list);
+
+  QObject::connect(page, &AddPodcastPage::Busy, this, &AddPodcastDialog::PageBusyChanged);
+
+}
+
+void AddPodcastDialog::ChangePage(const int index) {
+
+  AddPodcastPage *page = pages_[index];
+
+  ui_->stack->setCurrentIndex(index);
+  ui_->stack->setVisible(page->has_visible_widget());
+  ui_->results->setModel(page->model());
+
+  ui_->results_stack->setCurrentWidget(page_is_busy_[index] ? ui_->busy_page : ui_->results_page);
+
+  QObject::connect(ui_->results->selectionModel(), &QItemSelectionModel::currentRowChanged, this, &AddPodcastDialog::ChangePodcast);
+  ChangePodcast(QModelIndex());
+  CurrentPageBusyChanged(page_is_busy_[index]);
+
+  page->Show();
+
+}
+
+void AddPodcastDialog::ChangePodcast(const QModelIndex &current) {
+
+  QVariant podcast_variant = current.data(PodcastDiscoveryModel::Role_Podcast);
+
+  // If the selected item is invalid or not a podcast, hide the details pane.
+  if (podcast_variant.isNull()) {
+    ui_->details_scroll_area->hide();
+    add_button_->setEnabled(false);
+    remove_button_->setEnabled(false);
+    return;
+  }
+
+  current_podcast_ = podcast_variant.value<Podcast>();
+
+  // Start the blur+fade if there's already a podcast in the details pane.
+  if (ui_->details_scroll_area->isVisible()) {
+    fader_->StartBlur();
+  }
+  else {
+    ui_->details_scroll_area->show();
+  }
+
+  // Update the details pane
+  ui_->details->SetPodcast(current_podcast_);
+
+  // Is the user already subscribed to this podcast?
+  Podcast subscribed_podcast = app_->podcast_backend()->GetSubscriptionByUrl(current_podcast_.url());
+  const bool is_subscribed = subscribed_podcast.url().isValid();
+
+  if (is_subscribed) {
+    // Use the one from the database which will contain the ID.
+    current_podcast_ = subscribed_podcast;
+  }
+
+  add_button_->setEnabled(!is_subscribed);
+  remove_button_->setEnabled(is_subscribed);
+
+}
+
+void AddPodcastDialog::PageBusyChanged(const bool busy) {
+
+  const int index = pages_.indexOf(qobject_cast<AddPodcastPage*>(sender()));
+  if (index == -1) return;
+
+  page_is_busy_[index] = busy;
+
+  if (index == ui_->provider_list->currentRow()) {
+    CurrentPageBusyChanged(busy);
+  }
+
+}
+
+void AddPodcastDialog::CurrentPageBusyChanged(const bool busy) {
+
+  ui_->results_stack->setCurrentWidget(busy ? ui_->busy_page : ui_->results_page);
+  ui_->stack->setDisabled(busy);
+
+  QTimer::singleShot(0, this, &AddPodcastDialog::SelectFirstPodcast);
+
+}
+
+void AddPodcastDialog::SelectFirstPodcast() {
+
+  // Select the first item if there was one.
+  const PodcastDiscoveryModel *model = pages_[ui_->provider_list->currentRow()]->model();
+  if (model->rowCount() > 0) {
+    ui_->results->selectionModel()->setCurrentIndex(model->index(0, 0), QItemSelectionModel::ClearAndSelect);
+  }
+
+}
+
+void AddPodcastDialog::AddPodcast() {
+
+  app_->podcast_backend()->Subscribe(&current_podcast_);
+  add_button_->setEnabled(false);
+  remove_button_->setEnabled(true);
+
+}
+
+void AddPodcastDialog::PodcastDoubleClicked(const QModelIndex &idx) {
+
+  QVariant podcast_variant = idx.data(PodcastDiscoveryModel::Role_Podcast);
+  if (podcast_variant.isNull()) {
+    return;
+  }
+
+  current_podcast_ = podcast_variant.value<Podcast>();
+  app_->podcast_backend()->Subscribe(&current_podcast_);
+
+  add_button_->setEnabled(false);
+  remove_button_->setEnabled(true);
+
+}
+
+void AddPodcastDialog::RemovePodcast() {
+
+  app_->podcast_backend()->Unsubscribe(current_podcast_);
+  current_podcast_.set_database_id(-1);
+  add_button_->setEnabled(true);
+  remove_button_->setEnabled(false);
+
+}
+
+void AddPodcastDialog::OpenSettingsPage() {
+  //app_->OpenSettingsDialogAtPage(SettingsDialog::Page_Podcasts);
+}
+
+void AddPodcastDialog::OpenOPMLFile() {
+
+  const QString filename = QFileDialog::getOpenFileName(this, tr("Open OPML file"), last_opml_path_, "OPML files (*.opml)");
+
+  if (filename.isEmpty()) {
+    return;
+  }
+
+  last_opml_path_ = filename;
+
+  by_url_page_->SetUrlAndGo(QUrl::fromLocalFile(last_opml_path_));
+  ChangePage(ui_->stack->indexOf(by_url_page_));
+
+}

src/podcasts/addpodcastdialog.h

@@ -0,0 +1,91 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ADDPODCASTDIALOG_H
+#define ADDPODCASTDIALOG_H
+
+#include <QDialog>
+#include <QList>
+#include <QString>
+#include <QUrl>
+
+#include "podcast.h"
+
+class Application;
+class AddPodcastByUrl;
+class AddPodcastPage;
+class OpmlContainer;
+class WidgetFadeHelper;
+class Ui_AddPodcastDialog;
+
+class AddPodcastDialog : public QDialog {
+  Q_OBJECT
+
+ public:
+  explicit AddPodcastDialog(Application *app, QWidget *parent = nullptr);
+  ~AddPodcastDialog();
+
+  // Convenience methods that open the dialog at the Add By Url page and fill it with either a URL (which is then fetched), or a pre-fetched OPML container.
+  void ShowWithUrl(const QUrl &url);
+  void ShowWithOpml(const OpmlContainer &opml);
+
+ private slots:
+  void OpenSettingsPage();
+  void AddPodcast();
+  void PodcastDoubleClicked(const QModelIndex &idx);
+  void RemovePodcast();
+  void ChangePage(const int index);
+  void ChangePodcast(const QModelIndex &current);
+
+  void PageBusyChanged(const bool busy);
+  void CurrentPageBusyChanged(const bool busy);
+
+  void SelectFirstPodcast();
+
+  void OpenOPMLFile();
+
+ private:
+  void AddPage(AddPodcastPage *page);
+
+ private:
+  static const char *kBbcOpmlUrl;
+  static const char *kCbcOpmlUrl;
+
+  Application *app_;
+
+  Ui_AddPodcastDialog *ui_;
+  QPushButton *add_button_;
+  QPushButton *remove_button_;
+
+  QList<AddPodcastPage*> pages_;
+  QList<bool> page_is_busy_;
+  AddPodcastByUrl *by_url_page_;
+
+  WidgetFadeHelper *fader_;
+
+  Podcast current_podcast_;
+
+  QString last_opml_path_;
+};
+
+#endif  // ADDPODCASTDIALOG_H

src/podcasts/addpodcastdialog.ui

@@ -0,0 +1,276 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AddPodcastDialog</class>
+ <widget class="QDialog" name="AddPodcastDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>941</width>
+    <height>473</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Add podcast</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_3">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QListWidget" name="provider_list">
+       <property name="maximumSize">
+        <size>
+         <width>200</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="horizontalScrollBarPolicy">
+        <enum>Qt::ScrollBarAlwaysOff</enum>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>32</width>
+         <height>32</height>
+        </size>
+       </property>
+       <property name="uniformItemSizes">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <widget class="QStackedWidget" name="stack">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QStackedWidget" name="results_stack">
+         <property name="currentIndex">
+          <number>0</number>
+         </property>
+         <widget class="QWidget" name="results_page">
+          <layout class="QVBoxLayout" name="verticalLayout_2">
+           <property name="spacing">
+            <number>0</number>
+           </property>
+           <property name="leftMargin">
+            <number>0</number>
+           </property>
+           <property name="topMargin">
+            <number>0</number>
+           </property>
+           <property name="rightMargin">
+            <number>0</number>
+           </property>
+           <property name="bottomMargin">
+            <number>0</number>
+           </property>
+           <item>
+            <widget class="AutoExpandingTreeView" name="results">
+             <property name="editTriggers">
+              <set>QAbstractItemView::NoEditTriggers</set>
+             </property>
+             <property name="uniformRowHeights">
+              <bool>true</bool>
+             </property>
+             <attribute name="headerVisible">
+              <bool>false</bool>
+             </attribute>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+         <widget class="QWidget" name="busy_page">
+          <layout class="QVBoxLayout" name="verticalLayout_4">
+           <property name="spacing">
+            <number>0</number>
+           </property>
+           <property name="leftMargin">
+            <number>0</number>
+           </property>
+           <property name="topMargin">
+            <number>0</number>
+           </property>
+           <property name="rightMargin">
+            <number>0</number>
+           </property>
+           <property name="bottomMargin">
+            <number>0</number>
+           </property>
+           <item>
+            <spacer name="verticalSpacer_2">
+             <property name="orientation">
+              <enum>Qt::Vertical</enum>
+             </property>
+             <property name="sizeHint" stdset="0">
+              <size>
+               <width>0</width>
+               <height>192</height>
+              </size>
+             </property>
+            </spacer>
+           </item>
+           <item>
+            <layout class="QHBoxLayout" name="horizontalLayout_2">
+             <item>
+              <spacer name="horizontalSpacer">
+               <property name="orientation">
+                <enum>Qt::Horizontal</enum>
+               </property>
+               <property name="sizeHint" stdset="0">
+                <size>
+                 <width>40</width>
+                 <height>20</height>
+                </size>
+               </property>
+              </spacer>
+             </item>
+             <item>
+              <widget class="BusyIndicator" name="widget" native="true">
+               <property name="text" stdset="0">
+                <string>Loading...</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <spacer name="horizontalSpacer_2">
+               <property name="orientation">
+                <enum>Qt::Horizontal</enum>
+               </property>
+               <property name="sizeHint" stdset="0">
+                <size>
+                 <width>40</width>
+                 <height>20</height>
+                </size>
+               </property>
+              </spacer>
+             </item>
+            </layout>
+           </item>
+           <item>
+            <spacer name="verticalSpacer">
+             <property name="orientation">
+              <enum>Qt::Vertical</enum>
+             </property>
+             <property name="sizeHint" stdset="0">
+              <size>
+               <width>0</width>
+               <height>0</height>
+              </size>
+             </property>
+            </spacer>
+           </item>
+          </layout>
+         </widget>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <widget class="QScrollArea" name="details_scroll_area">
+       <property name="minimumSize">
+        <size>
+         <width>250</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>250</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="horizontalScrollBarPolicy">
+        <enum>Qt::ScrollBarAlwaysOff</enum>
+       </property>
+       <property name="widgetResizable">
+        <bool>true</bool>
+       </property>
+       <widget class="PodcastInfoWidget" name="details">
+        <property name="geometry">
+         <rect>
+          <x>0</x>
+          <y>0</y>
+          <width>248</width>
+          <height>415</height>
+         </rect>
+        </property>
+       </widget>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="button_box">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>BusyIndicator</class>
+   <extends>QWidget</extends>
+   <header>widgets/busyindicator.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>PodcastInfoWidget</class>
+   <extends>QWidget</extends>
+   <header>podcasts/podcastinfowidget.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>AutoExpandingTreeView</class>
+   <extends>QTreeView</extends>
+   <header>widgets/autoexpandingtreeview.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>button_box</sender>
+   <signal>accepted()</signal>
+   <receiver>AddPodcastDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>836</x>
+     <y>463</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>button_box</sender>
+   <signal>rejected()</signal>
+   <receiver>AddPodcastDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>885</x>
+     <y>463</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/podcasts/addpodcastpage.cpp

@@ -0,0 +1,36 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QWidget>
+
+#include "addpodcastpage.h"
+
+#include "podcastdiscoverymodel.h"
+
+AddPodcastPage::AddPodcastPage(Application *app, QWidget *parent)
+    : QWidget(parent), model_(new PodcastDiscoveryModel(app, this)) {}
+
+void AddPodcastPage::SetModel(PodcastDiscoveryModel *model) {
+  delete model_;
+  model_ = model;
+}

src/podcasts/addpodcastpage.h

@@ -0,0 +1,53 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ADDPODCASTPAGE_H
+#define ADDPODCASTPAGE_H
+
+#include <QWidget>
+
+class Application;
+class PodcastDiscoveryModel;
+
+class AddPodcastPage : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit AddPodcastPage(Application *app, QWidget *parent = nullptr);
+
+  PodcastDiscoveryModel *model() const { return model_; }
+
+  virtual bool has_visible_widget() const { return true; }
+  virtual void Show() {}
+
+ signals:
+  void Busy(bool busy);
+
+ protected:
+  void SetModel(PodcastDiscoveryModel *model);
+
+ private:
+  PodcastDiscoveryModel *model_;
+};
+
+#endif  // ADDPODCASTPAGE_H

src/podcasts/episodeinfowidget.cpp

@@ -0,0 +1,49 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+   Copyright 2018, Jim Broadus <jbroadus@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QWidget>
+
+#include "core/utilities.h"
+
+#include "episodeinfowidget.h"
+#include "ui_episodeinfowidget.h"
+
+EpisodeInfoWidget::EpisodeInfoWidget(QWidget *parent)
+    : QWidget(parent), ui_(new Ui_EpisodeInfoWidget), app_(nullptr) {
+
+  ui_->setupUi(this);
+
+}
+
+EpisodeInfoWidget::~EpisodeInfoWidget() { delete ui_; }
+
+void EpisodeInfoWidget::SetApplication(Application *app) { app_ = app; }
+
+void EpisodeInfoWidget::SetEpisode(const PodcastEpisode &episode) {
+
+  episode_ = episode;
+  ui_->title->setText(episode.title());
+  ui_->description->setText(episode.description());
+  ui_->author->setText(episode.author());
+  ui_->date->setText(episode.publication_date().toString("d MMMM yyyy"));
+  ui_->duration->setText(Utilities::PrettyTime(episode.duration_secs()));
+
+}

src/podcasts/episodeinfowidget.h

@@ -0,0 +1,50 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+   Copyright 2018, Jim Broadus <jbroadus@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef EPISODEINFOWIDGET_H
+#define EPISODEINFOWIDGET_H
+
+#include <QWidget>
+
+#include "podcastepisode.h"
+
+class Application;
+class Ui_EpisodeInfoWidget;
+
+class EpisodeInfoWidget : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit EpisodeInfoWidget(QWidget *parent = nullptr);
+  ~EpisodeInfoWidget();
+
+  void SetApplication(Application *app);
+
+  void SetEpisode(const PodcastEpisode &episode);
+
+ private:
+  Ui_EpisodeInfoWidget *ui_;
+
+  Application *app_;
+  PodcastEpisode episode_;
+};
+
+#endif  // EPISODEINFOWIDGET_H

src/podcasts/episodeinfowidget.ui

@@ -0,0 +1,137 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>EpisodeInfoWidget</class>
+ <widget class="QWidget" name="EpisodeInfoWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>398</width>
+    <height>551</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <property name="styleSheet">
+   <string notr="true">#title {
+	font-weight: bold;
+}
+
+#description {
+	font-size: smaller;
+}
+
+QLineEdit {
+  background: transparent;
+}</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="sizeConstraint">
+    <enum>QLayout::SetMinAndMaxSize</enum>
+   </property>
+   <item>
+    <widget class="QLabel" name="title">
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="description">
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QGridLayout" name="gridLayout">
+     <property name="sizeConstraint">
+      <enum>QLayout::SetMinAndMaxSize</enum>
+     </property>
+     <item row="0" column="0">
+      <widget class="QLabel" name="author_label">
+       <property name="text">
+        <string>Author</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QLineEdit" name="date">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLineEdit" name="author">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="0">
+      <widget class="QLabel" name="date_label">
+       <property name="text">
+        <string>Date</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="2" column="0">
+      <widget class="QLabel" name="duration_label">
+       <property name="text">
+        <string>Duration</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="2" column="1">
+      <widget class="QLineEdit" name="duration">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>0</width>
+       <height>0</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

src/podcasts/fixedopmlpage.cpp

@@ -0,0 +1,82 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QString>
+#include <QUrl>
+#include <QIcon>
+#include <QMessageBox>
+
+#include "podcastdiscoverymodel.h"
+#include "podcasturlloader.h"
+
+#include "fixedopmlpage.h"
+
+FixedOpmlPage::FixedOpmlPage(const QUrl &opml_url, const QString &title, const QIcon &icon, Application *app, QWidget *parent)
+    : AddPodcastPage(app, parent),
+      loader_(new PodcastUrlLoader(this)),
+      opml_url_(opml_url),
+      done_initial_load_(false) {
+
+  setWindowTitle(title);
+  setWindowIcon(icon);
+
+}
+
+void FixedOpmlPage::Show() {
+
+  if (!done_initial_load_) {
+    emit Busy(true);
+    done_initial_load_ = true;
+
+    PodcastUrlLoaderReply *reply = loader_->Load(opml_url_);
+    QObject::connect(reply, &PodcastUrlLoaderReply::Finished, this, [this, reply]() { LoadFinished(reply); });
+  }
+
+}
+
+void FixedOpmlPage::LoadFinished(PodcastUrlLoaderReply *reply) {
+
+  reply->deleteLater();
+  emit Busy(false);
+
+  if (!reply->is_success()) {
+    QMessageBox::warning(this, tr("Failed to load podcast"), reply->error_text(), QMessageBox::Close);
+    return;
+  }
+
+  switch (reply->result_type()) {
+    case PodcastUrlLoaderReply::Type_Podcast:{
+      const PodcastList podcasts = reply->podcast_results();
+      for (const Podcast &podcast : podcasts) {
+        model()->appendRow(model()->CreatePodcastItem(podcast));
+      }
+      break;
+    }
+
+    case PodcastUrlLoaderReply::Type_Opml:
+      model()->CreateOpmlContainerItems(reply->opml_results(), model()->invisibleRootItem());
+      break;
+  }
+
+}

src/podcasts/fixedopmlpage.h

@@ -0,0 +1,56 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef FIXEDOPMLPAGE_H
+#define FIXEDOPMLPAGE_H
+
+#include <QObject>
+#include <QUrl>
+#include <QIcon>
+
+#include "addpodcastpage.h"
+
+class Application;
+class PodcastUrlLoader;
+class PodcastUrlLoaderReply;
+
+class FixedOpmlPage : public AddPodcastPage {
+  Q_OBJECT
+
+ public:
+  FixedOpmlPage(const QUrl &opml_url, const QString &title, const QIcon &icon, Application *app, QWidget *parent = nullptr);
+
+  bool has_visible_widget() const { return false; }
+  void Show();
+
+ private slots:
+  void LoadFinished(PodcastUrlLoaderReply *reply);
+
+ private:
+  PodcastUrlLoader *loader_;
+  QUrl opml_url_;
+
+  bool done_initial_load_;
+};
+
+#endif  // FIXEDOPMLPAGE_H

src/podcasts/gpoddersearchpage.cpp

@@ -0,0 +1,100 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QMessageBox>
+#include <QPushButton>
+
+#include "core/application.h"
+#include "core/iconloader.h"
+#include "core/networkaccessmanager.h"
+#include "podcast.h"
+#include "podcastdiscoverymodel.h"
+
+#include "gpoddersearchpage.h"
+#include "ui_gpoddersearchpage.h"
+
+GPodderSearchPage::GPodderSearchPage(Application *app, QWidget *parent)
+    : AddPodcastPage(app, parent),
+      ui_(new Ui_GPodderSearchPage),
+      network_(new NetworkAccessManager(this)),
+      api_(new mygpo::ApiRequest(network_)) {
+
+  ui_->setupUi(this);
+  QObject::connect(ui_->search, &QPushButton::clicked, this, &GPodderSearchPage::SearchClicked);
+  setWindowIcon(IconLoader::Load("mygpo"));
+
+}
+
+GPodderSearchPage::~GPodderSearchPage() {
+
+  delete ui_;
+  delete api_;
+
+}
+
+void GPodderSearchPage::SearchClicked() {
+
+  emit Busy(true);
+
+  mygpo::PodcastListPtr list(api_->search(ui_->query->text()));
+  QObject::connect(list.data(), &mygpo::PodcastList::finished, this, [this, list]() { SearchFinished(list); });
+  QObject::connect(list.data(), &mygpo::PodcastList::parseError, this, [this, list]() { SearchFailed(list); });
+  QObject::connect(list.data(), &mygpo::PodcastList::requestError, this, [this, list]() { SearchFailed(list); });
+
+}
+
+void GPodderSearchPage::SearchFinished(mygpo::PodcastListPtr list) {
+
+  emit Busy(false);
+
+  model()->clear();
+
+  for (mygpo::PodcastPtr gpo_podcast : list->list()) {
+    Podcast podcast;
+    podcast.InitFromGpo(gpo_podcast.data());
+
+    model()->appendRow(model()->CreatePodcastItem(podcast));
+  }
+
+}
+
+void GPodderSearchPage::SearchFailed(mygpo::PodcastListPtr list) {
+
+  emit Busy(false);
+
+  model()->clear();
+
+  if (QMessageBox::warning(
+        nullptr, tr("Failed to fetch podcasts"),
+        tr("There was a problem communicating with gpodder.net"),
+        QMessageBox::Retry | QMessageBox::Close,
+        QMessageBox::Retry) != QMessageBox::Retry) {
+    return;
+  }
+
+  // Try doing the search again.
+  SearchClicked();
+
+}
+
+void GPodderSearchPage::Show() { ui_->query->setFocus(); }

src/podcasts/gpoddersearchpage.h

@@ -0,0 +1,57 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GPODDERSEARCHPAGE_H
+#define GPODDERSEARCHPAGE_H
+
+#include <ApiRequest.h>
+
+#include "addpodcastpage.h"
+
+class QNetworkAccessManager;
+
+class Application;
+class Ui_GPodderSearchPage;
+
+class GPodderSearchPage : public AddPodcastPage {
+  Q_OBJECT
+
+ public:
+  explicit GPodderSearchPage(Application *app, QWidget *parent = nullptr);
+  ~GPodderSearchPage();
+
+  void Show();
+
+ private slots:
+  void SearchClicked();
+  void SearchFinished(mygpo::PodcastListPtr list);
+  void SearchFailed(mygpo::PodcastListPtr list);
+
+ private:
+  Ui_GPodderSearchPage *ui_;
+
+  QNetworkAccessManager *network_;
+  mygpo::ApiRequest *api_;
+};
+
+#endif  // GPODDERSEARCHPAGE_H

src/podcasts/gpoddersearchpage.ui

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>GPodderSearchPage</class>
+ <widget class="QWidget" name="GPodderSearchPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>538</width>
+    <height>69</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Search gpodder.net</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Enter search terms below to find podcasts on gpodder.net</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLineEdit" name="query"/>
+     </item>
+     <item>
+      <widget class="QPushButton" name="search">
+       <property name="text">
+        <string>Search</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <connections>
+  <connection>
+   <sender>query</sender>
+   <signal>returnPressed()</signal>
+   <receiver>search</receiver>
+   <slot>click()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>130</x>
+     <y>45</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>198</x>
+     <y>46</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/podcasts/gpoddersync.cpp

@@ -0,0 +1,415 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QCoreApplication>
+#include <QSet>
+#include <QList>
+#include <QMap>
+#include <QString>
+#include <QUrl>
+#include <QHostInfo>
+#include <QNetworkReply>
+#include <QNetworkCookieJar>
+#include <QSettings>
+#include <QTimer>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/networkaccessmanager.h"
+#include "core/timeconstants.h"
+#include "core/utilities.h"
+#include "podcastbackend.h"
+#include "podcasturlloader.h"
+#include "gpoddersync.h"
+
+const char *GPodderSync::kSettingsGroup = "Podcasts";
+const int GPodderSync::kFlushUpdateQueueDelay = 30 * kMsecPerSec;   // 30 seconds
+const int GPodderSync::kGetUpdatesInterval = 30 * 60 * kMsecPerSec; // 30 minutes
+const int GPodderSync::kRequestTimeout = 30 * kMsecPerSec;          // 30 seconds
+
+GPodderSync::GPodderSync(Application *app, QObject *parent)
+    : QObject(parent),
+      app_(app),
+      network_(new NetworkAccessManager(this)),
+      backend_(app_->podcast_backend()),
+      loader_(new PodcastUrlLoader(this)),
+      get_updates_timer_(new QTimer(this)),
+      flush_queue_timer_(new QTimer(this)),
+      flushing_queue_(false) {
+
+  ReloadSettings();
+  LoadQueue();
+
+  QObject::connect(app_, &Application::SettingsChanged, this, &GPodderSync::ReloadSettings);
+  QObject::connect(backend_, &PodcastBackend::SubscriptionAdded, this, &GPodderSync::SubscriptionAdded);
+  QObject::connect(backend_, &PodcastBackend::SubscriptionRemoved, this, &GPodderSync::SubscriptionRemoved);
+
+  get_updates_timer_->setInterval(kGetUpdatesInterval);
+  connect(get_updates_timer_, &QTimer::timeout, this, &GPodderSync::GetUpdatesNow);
+
+  flush_queue_timer_->setInterval(kFlushUpdateQueueDelay);
+  flush_queue_timer_->setSingleShot(true);
+  QObject::connect(flush_queue_timer_, &QTimer::timeout, this, &GPodderSync::FlushUpdateQueue);
+
+  if (is_logged_in()) {
+    GetUpdatesNow();
+    flush_queue_timer_->start();
+    get_updates_timer_->start();
+  }
+}
+
+GPodderSync::~GPodderSync() {}
+
+QString GPodderSync::DeviceId() {
+
+  return QString("%1-%2").arg(qApp->applicationName(), QHostInfo::localHostName()).toLower();
+
+}
+
+QString GPodderSync::DefaultDeviceName() {
+  return tr("%1 on %2").arg(qApp->applicationName(), QHostInfo::localHostName());
+}
+
+bool GPodderSync::is_logged_in() const {
+  return !username_.isEmpty() && !password_.isEmpty() && api_;
+}
+
+void GPodderSync::ReloadSettings() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  username_ = s.value("gpodder_username").toString();
+  password_ = s.value("gpodder_password").toString();
+  last_successful_get_ = s.value("gpodder_last_get").toDateTime();
+
+  s.endGroup();
+
+  if (!username_.isEmpty() && !password_.isEmpty()) {
+    api_.reset(new mygpo::ApiRequest(username_, password_, network_));
+  }
+
+}
+
+void GPodderSync::Login(const QString &username, const QString &password, const QString &device_name) {
+
+  api_.reset(new mygpo::ApiRequest(username, password, network_));
+
+  QNetworkReply *reply = api_->renameDevice(username, DeviceId(), device_name, mygpo::Device::DESKTOP);
+  QObject::connect(reply, &QNetworkReply::finished, this, [this, reply, username, password]() { LoginFinished(reply, username, password); });
+
+}
+
+void GPodderSync::LoginFinished(QNetworkReply *reply, const QString &username, const QString &password) {
+
+  reply->deleteLater();
+
+  if (reply->error() == QNetworkReply::NoError) {
+    username_ = username;
+    password_ = password;
+
+    QSettings s;
+    s.beginGroup(kSettingsGroup);
+    s.setValue("gpodder_username", username);
+    s.setValue("gpodder_password", password);
+    s.endGroup();
+
+    DoInitialSync();
+    emit LoginSuccess();
+  }
+  else {
+    api_.reset();
+    emit LoginFailure(reply->errorString());
+  }
+
+}
+
+void GPodderSync::Logout() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  s.remove("gpodder_username");
+  s.remove("gpodder_password");
+  s.remove("gpodder_last_get");
+  s.endGroup();
+
+  api_.reset();
+
+  // Remove session cookies. QNetworkAccessManager takes ownership of the new object and frees the previous.
+  network_->setCookieJar(new QNetworkCookieJar());
+
+}
+
+void GPodderSync::GetUpdatesNow() {
+
+  if (!is_logged_in()) return;
+
+  qlonglong timestamp = 0;
+  if (last_successful_get_.isValid()) {
+    timestamp = last_successful_get_.toSecsSinceEpoch();
+  }
+
+  mygpo::DeviceUpdatesPtr reply(api_->deviceUpdates(username_, DeviceId(), timestamp));
+  QObject::connect(reply.data(), &mygpo::DeviceUpdates::finished, this, [this, reply]() { DeviceUpdatesFinished(reply); });
+  QObject::connect(reply.data(), &mygpo::DeviceUpdates::parseError, this, &GPodderSync::DeviceUpdatesParseError);
+  QObject::connect(reply.data(), &mygpo::DeviceUpdates::requestError, this, &GPodderSync::DeviceUpdatesRequestError);
+
+}
+
+void GPodderSync::DeviceUpdatesParseError() {
+  qLog(Warning) << "Failed to get gpodder device updates: parse error";
+}
+
+void GPodderSync::DeviceUpdatesRequestError(QNetworkReply::NetworkError error) {
+  qLog(Warning) << "Failed to get gpodder device updates:" << error;
+}
+
+void GPodderSync::DeviceUpdatesFinished(mygpo::DeviceUpdatesPtr reply) {
+
+  // Remember episode actions for each podcast, so when we add a new podcast
+  // we can apply the actions immediately.
+  QMap<QUrl, QList<mygpo::EpisodePtr>> episodes_by_podcast;
+  for (mygpo::EpisodePtr episode : reply->updateList()) {
+    episodes_by_podcast[episode->podcastUrl()].append(episode);
+  }
+
+  for (mygpo::PodcastPtr podcast : reply->addList()) {
+    const QUrl url(podcast->url());
+
+    // Are we subscribed to this podcast already?
+    Podcast existing_podcast = backend_->GetSubscriptionByUrl(url);
+    if (existing_podcast.is_valid()) {
+      // Just apply actions to this existing podcast
+      ApplyActions(episodes_by_podcast[url], existing_podcast.mutable_episodes());
+      backend_->UpdateEpisodes(existing_podcast.episodes());
+      continue;
+    }
+
+    // Start loading the podcast.  Remember actions and apply them after we have a list of the episodes.
+    PodcastUrlLoaderReply *loader_reply = loader_->Load(url);
+    QObject::connect(loader_reply, &PodcastUrlLoaderReply::Finished, this, [this, loader_reply, url, episodes_by_podcast]() { NewPodcastLoaded(loader_reply, url, episodes_by_podcast[url]); });
+  }
+
+  // Unsubscribe from podcasts that were removed.
+  for (const QUrl &url : reply->removeList()) {
+    backend_->Unsubscribe(backend_->GetSubscriptionByUrl(url));
+  }
+
+  last_successful_get_ = QDateTime::currentDateTime();
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  s.setValue("gpodder_last_get", last_successful_get_);
+  s.endGroup();
+
+}
+
+void GPodderSync::NewPodcastLoaded(PodcastUrlLoaderReply *reply, const QUrl &url, const QList<mygpo::EpisodePtr> &actions) {
+
+  reply->deleteLater();
+
+  if (!reply->is_success()) {
+    qLog(Warning) << "Error fetching podcast at" << url << ":" << reply->error_text();
+    return;
+  }
+
+  if (reply->result_type() != PodcastUrlLoaderReply::Type_Podcast) {
+    qLog(Warning) << "The URL" << url << "no longer contains a podcast";
+    return;
+  }
+
+  // Apply the actions to the episodes in the podcast.
+  for (Podcast podcast : reply->podcast_results()) {
+    ApplyActions(actions, podcast.mutable_episodes());
+
+    // Add the subscription
+    backend_->Subscribe(&podcast);
+  }
+}
+
+void GPodderSync::ApplyActions(const QList<QSharedPointer<mygpo::Episode>> &actions, PodcastEpisodeList *episodes) {
+
+  for (PodcastEpisodeList::iterator it = episodes->begin(); it != episodes->end(); ++it) {
+    // Find an action for this episode
+    for (mygpo::EpisodePtr action : actions) {
+      if (action->url() != it->url()) continue;
+
+      switch (action->status()) {
+        case mygpo::Episode::PLAY:
+        case mygpo::Episode::DOWNLOAD:
+          it->set_listened(true);
+          break;
+
+        default:
+          break;
+      }
+      break;
+    }
+  }
+
+}
+
+void GPodderSync::SubscriptionAdded(const Podcast &podcast) {
+
+  if (!is_logged_in()) return;
+
+  const QUrl &url = podcast.url();
+
+  queued_remove_subscriptions_.remove(url);
+  queued_add_subscriptions_.insert(url);
+
+  SaveQueue();
+  flush_queue_timer_->start();
+
+}
+
+void GPodderSync::SubscriptionRemoved(const Podcast &podcast) {
+
+  if (!is_logged_in()) return;
+
+  const QUrl &url = podcast.url();
+
+  queued_remove_subscriptions_.insert(url);
+  queued_add_subscriptions_.remove(url);
+
+  SaveQueue();
+  flush_queue_timer_->start();
+
+}
+
+namespace {
+template<typename T>
+void WriteContainer(const T &container, QSettings *s, const char *array_name, const char *item_name) {
+
+  s->beginWriteArray(array_name, container.count());
+  int index = 0;
+  for (const auto &item : container) {
+    s->setArrayIndex(index++);
+    s->setValue(item_name, item);
+  }
+  s->endArray();
+
+}
+
+template<typename T>
+void ReadContainer(T *container, QSettings *s, const char *array_name, const char *item_name) {
+
+  container->clear();
+  const int count = s->beginReadArray(array_name);
+  for (int i = 0; i < count; ++i) {
+    s->setArrayIndex(i);
+    *container << s->value(item_name).value<typename T::value_type>();
+  }
+  s->endArray();
+
+}
+}  // namespace
+
+void GPodderSync::SaveQueue() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  WriteContainer(queued_add_subscriptions_, &s, "gpodder_queued_add_subscriptions", "url");
+  WriteContainer(queued_remove_subscriptions_, &s, "gpodder_queued_remove_subscriptions", "url");
+  s.endGroup();
+
+}
+
+void GPodderSync::LoadQueue() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  ReadContainer(&queued_add_subscriptions_, &s, "gpodder_queued_add_subscriptions", "url");
+  ReadContainer(&queued_remove_subscriptions_, &s, "gpodder_queued_remove_subscriptions", "url");
+  s.endGroup();
+
+}
+
+void GPodderSync::FlushUpdateQueue() {
+
+  if (!is_logged_in() || flushing_queue_) return;
+
+  QSet<QUrl> all_urls = queued_add_subscriptions_ + queued_remove_subscriptions_;
+  if (all_urls.isEmpty()) return;
+
+  flushing_queue_ = true;
+  mygpo::AddRemoveResultPtr reply(api_->addRemoveSubscriptions(username_, DeviceId(), queued_add_subscriptions_.values(), queued_remove_subscriptions_.values()));
+
+  qLog(Info) << "Sending" << all_urls.count() << "changes to gpodder.net";
+
+  QObject::connect(reply.data(), &mygpo::AddRemoveResult::finished, this, [this, all_urls]() { AddRemoveFinished(all_urls.values()); });
+  QObject::connect(reply.data(), &mygpo::AddRemoveResult::parseError, this, &GPodderSync::AddRemoveParseError);
+  QObject::connect(reply.data(), &mygpo::AddRemoveResult::requestError, this, &GPodderSync::AddRemoveRequestError);
+}
+
+void GPodderSync::AddRemoveParseError() {
+
+  flushing_queue_ = false;
+  qLog(Warning) << "Failed to update gpodder subscriptions: parse error";
+
+}
+
+void GPodderSync::AddRemoveRequestError(QNetworkReply::NetworkError err) {
+
+  flushing_queue_ = false;
+  qLog(Warning) << "Failed to update gpodder subscriptions:" << err;
+
+}
+
+void GPodderSync::AddRemoveFinished(const QList<QUrl> &affected_urls) {
+
+  flushing_queue_ = false;
+
+  // Remove the URLs from the queue.
+  for (const QUrl &url : affected_urls) {
+    queued_add_subscriptions_.remove(url);
+    queued_remove_subscriptions_.remove(url);
+  }
+
+  SaveQueue();
+
+  // Did more change in the mean time?
+  if (!queued_add_subscriptions_.isEmpty() ||
+    !queued_remove_subscriptions_.isEmpty()) {
+    flush_queue_timer_->start();
+  }
+
+}
+
+void GPodderSync::DoInitialSync() {
+
+  // Get updates from the server
+  GetUpdatesNow();
+  get_updates_timer_->start();
+
+  // Send our complete list of subscriptions
+  queued_remove_subscriptions_.clear();
+  queued_add_subscriptions_.clear();
+  for (const Podcast &podcast : backend_->GetAllSubscriptions()) {
+    queued_add_subscriptions_.insert(podcast.url());
+  }
+
+  SaveQueue();
+  FlushUpdateQueue();
+
+}

src/podcasts/gpoddersync.h

@@ -0,0 +1,125 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GPODDERSYNC_H
+#define GPODDERSYNC_H
+
+#include <QObject>
+#include <QScopedPointer>
+#include <QSet>
+#include <QList>
+#include <QString>
+#include <QDateTime>
+#include <QUrl>
+#include <QNetworkReply>
+
+#include <ApiRequest.h>
+
+#include "podcastepisode.h"
+
+class QTimer;
+
+class Application;
+class NetworkAccessManager;
+class Podcast;
+class PodcastBackend;
+class PodcastUrlLoader;
+class PodcastUrlLoaderReply;
+
+class GPodderSync : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit GPodderSync(Application *app, QObject *parent = nullptr);
+  ~GPodderSync();
+
+  static const char *kSettingsGroup;
+  static const int kFlushUpdateQueueDelay;
+  static const int kGetUpdatesInterval;
+  static const int kRequestTimeout;
+
+  static QString DefaultDeviceName();
+  static QString DeviceId();
+
+  bool is_logged_in() const;
+
+  // Tries to login using the given username and password.  Also sets the device name and type on gpodder.net.
+  // If login succeeds the username and password will be saved in QSettings.
+  void Login(const QString &username, const QString &password, const QString &device_name);
+
+  // Clears any saved username and password from QSettings.
+  void Logout();
+
+ signals:
+  void LoginSuccess();
+  void LoginFailure(const QString &error);
+
+ public slots:
+  void GetUpdatesNow();
+
+ private slots:
+  void ReloadSettings();
+  void LoginFinished(QNetworkReply *reply, const QString &username, const QString &password);
+
+  void DeviceUpdatesFinished(mygpo::DeviceUpdatesPtr reply);
+  void DeviceUpdatesParseError();
+  void DeviceUpdatesRequestError(QNetworkReply::NetworkError error);
+
+  void NewPodcastLoaded(PodcastUrlLoaderReply *reply, const QUrl &url, const QList<mygpo::EpisodePtr> &actions);
+
+  void ApplyActions(const QList<mygpo::EpisodePtr> &actions, PodcastEpisodeList *episodes);
+
+  void SubscriptionAdded(const Podcast &podcast);
+  void SubscriptionRemoved(const Podcast &podcast);
+  void FlushUpdateQueue();
+
+  void AddRemoveFinished(const QList<QUrl> &affected_urls);
+  void AddRemoveParseError();
+  void AddRemoveRequestError(QNetworkReply::NetworkError error);
+
+ private:
+  void LoadQueue();
+  void SaveQueue();
+
+  void DoInitialSync();
+
+ private:
+  Application *app_;
+  NetworkAccessManager *network_;
+  QScopedPointer<mygpo::ApiRequest> api_;
+
+  PodcastBackend *backend_;
+  PodcastUrlLoader *loader_;
+
+  QString username_;
+  QString password_;
+  QDateTime last_successful_get_;
+  QTimer *get_updates_timer_;
+
+  QTimer *flush_queue_timer_;
+  QSet<QUrl> queued_add_subscriptions_;
+  QSet<QUrl> queued_remove_subscriptions_;
+  bool flushing_queue_;
+};
+
+#endif  // GPODDERSYNC_H

src/podcasts/gpoddertoptagsmodel.cpp

@@ -0,0 +1,115 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QMessageBox>
+
+#include <ApiRequest.h>
+
+#include "core/application.h"
+
+#include "gpoddertoptagsmodel.h"
+#include "gpoddertoptagspage.h"
+#include "podcast.h"
+
+GPodderTopTagsModel::GPodderTopTagsModel(mygpo::ApiRequest *api, Application *app, QObject *parent)
+    : PodcastDiscoveryModel(app, parent), api_(api) {}
+
+bool GPodderTopTagsModel::hasChildren(const QModelIndex &parent) const {
+
+  if (parent.isValid() && parent.data(Role_Type).toInt() == Type_Folder) {
+    return true;
+  }
+
+  return PodcastDiscoveryModel::hasChildren(parent);
+
+}
+
+bool GPodderTopTagsModel::canFetchMore(const QModelIndex &parent) const {
+
+  if (parent.isValid() && parent.data(Role_Type).toInt() == Type_Folder &&
+    !parent.data(Role_HasLazyLoaded).toBool()) {
+    return true;
+  }
+
+  return PodcastDiscoveryModel::canFetchMore(parent);
+
+}
+
+void GPodderTopTagsModel::fetchMore(const QModelIndex &parent) {
+
+  if (!parent.isValid() || parent.data(Role_Type).toInt() != Type_Folder ||
+    parent.data(Role_HasLazyLoaded).toBool()) {
+    return;
+  }
+  setData(parent, true, Role_HasLazyLoaded);
+
+  // Create a little Loading... item.
+  itemFromIndex(parent)->appendRow(CreateLoadingIndicator());
+
+  mygpo::PodcastListPtr list(api_->podcastsOfTag(GPodderTopTagsPage::kMaxTagCount, parent.data().toString()));
+
+  QObject::connect(list.get(), &mygpo::PodcastList::finished, this, [this, parent, list]() { PodcastsOfTagFinished(parent, list.data()); });
+  QObject::connect(list.get(), &mygpo::PodcastList::parseError, this, [this, parent, list]() { PodcastsOfTagFailed(parent, list.data()); });
+  QObject::connect(list.get(), &mygpo::PodcastList::requestError, this, [this, parent, list]() { PodcastsOfTagFailed(parent, list.data()); });
+
+}
+
+void GPodderTopTagsModel::PodcastsOfTagFinished(const QModelIndex &parent, mygpo::PodcastList *list) {
+
+  QStandardItem *parent_item = itemFromIndex(parent);
+  if (!parent_item) return;
+
+  // Remove the Loading... item.
+  while (parent_item->hasChildren()) {
+    parent_item->removeRow(0);
+  }
+
+  for (mygpo::PodcastPtr gpo_podcast : list->list()) {
+    Podcast podcast;
+    podcast.InitFromGpo(gpo_podcast.data());
+
+    parent_item->appendRow(CreatePodcastItem(podcast));
+  }
+
+}
+
+void GPodderTopTagsModel::PodcastsOfTagFailed(const QModelIndex &parent, mygpo::PodcastList*) {
+
+  QStandardItem *parent_item = itemFromIndex(parent);
+  if (!parent_item) return;
+
+  // Remove the Loading... item.
+  while (parent_item->hasChildren()) {
+    parent_item->removeRow(0);
+  }
+
+  if (QMessageBox::warning(nullptr, tr("Failed to fetch podcasts"), tr("There was a problem communicating with gpodder.net"), QMessageBox::Retry | QMessageBox::Close, QMessageBox::Retry) != QMessageBox::Retry) {
+    return;
+  }
+
+  // Try fetching the list again.
+  setData(parent, false, Role_HasLazyLoaded);
+  fetchMore(parent);
+
+}

src/podcasts/gpoddertoptagsmodel.h

@@ -0,0 +1,61 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GPODDERTOPTAGSMODEL_H
+#define GPODDERTOPTAGSMODEL_H
+
+#include <QObject>
+
+#include "podcastdiscoverymodel.h"
+
+namespace mygpo {
+class ApiRequest;
+class PodcastList;
+}  // namespace mygpo
+
+class Application;
+
+class GPodderTopTagsModel : public PodcastDiscoveryModel {
+  Q_OBJECT
+
+ public:
+  GPodderTopTagsModel(mygpo::ApiRequest *api, Application *app, QObject *parent = nullptr);
+
+  enum Role {
+    Role_HasLazyLoaded = PodcastDiscoveryModel::RoleCount,
+    RoleCount
+  };
+
+  bool hasChildren(const QModelIndex &parent) const;
+  bool canFetchMore(const QModelIndex &parent) const;
+  void fetchMore(const QModelIndex &parent);
+
+ private slots:
+  void PodcastsOfTagFinished(const QModelIndex &parent, mygpo::PodcastList *list);
+  void PodcastsOfTagFailed(const QModelIndex &parent, mygpo::PodcastList *list);
+
+ private:
+  mygpo::ApiRequest *api_;
+};
+
+#endif  // GPODDERTOPTAGSMODEL_H

src/podcasts/gpoddertoptagspage.cpp

@@ -0,0 +1,93 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QMessageBox>
+
+#include "TagList.h"
+
+#include "core/application.h"
+#include "core/networkaccessmanager.h"
+#include "core/iconloader.h"
+
+#include "gpoddertoptagsmodel.h"
+#include "gpoddertoptagspage.h"
+
+const int GPodderTopTagsPage::kMaxTagCount = 100;
+
+GPodderTopTagsPage::GPodderTopTagsPage(Application *app, QWidget *parent)
+    : AddPodcastPage(app, parent),
+      network_(new NetworkAccessManager(this)),
+      api_(new mygpo::ApiRequest(network_)),
+      done_initial_load_(false) {
+
+  setWindowTitle(tr("gpodder.net directory"));
+  setWindowIcon(IconLoader::Load("mygpo"));
+
+  SetModel(new GPodderTopTagsModel(api_, app, this));
+
+}
+
+GPodderTopTagsPage::~GPodderTopTagsPage() { delete api_; }
+
+void GPodderTopTagsPage::Show() {
+
+  if (!done_initial_load_) {
+    // Start the request for list of top-level tags
+    emit Busy(true);
+    done_initial_load_ = true;
+
+    mygpo::TagListPtr tag_list(api_->topTags(kMaxTagCount));
+    QObject::connect(tag_list.get(), &mygpo::TagList::finished, this, [this, tag_list]() { TagListLoaded(tag_list); });
+    QObject::connect(tag_list.get(), &mygpo::TagList::parseError, this, [this]() { TagListFailed(); });
+    QObject::connect(tag_list.get(), &mygpo::TagList::requestError, this, [this]() { TagListFailed(); });
+  }
+
+}
+
+void GPodderTopTagsPage::TagListLoaded(mygpo::TagListPtr tag_list) {
+
+  emit Busy(false);
+
+  for (mygpo::TagPtr tag : tag_list->list()) {
+    model()->appendRow(model()->CreateFolder(tag->tag()));
+  }
+
+}
+
+void GPodderTopTagsPage::TagListFailed() {
+
+  emit Busy(false);
+  done_initial_load_ = false;
+
+  if (QMessageBox::warning(
+        nullptr, tr("Failed to fetch directory"),
+        tr("There was a problem communicating with gpodder.net"),
+        QMessageBox::Retry | QMessageBox::Close,
+        QMessageBox::Retry) != QMessageBox::Retry) {
+    return;
+  }
+
+  // Try doing the search again.
+  Show();
+
+}

src/podcasts/gpoddertoptagspage.h

@@ -0,0 +1,59 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GPODDERTOPTAGSPAGE_H
+#define GPODDERTOPTAGSPAGE_H
+
+#include <QObject>
+
+#include <ApiRequest.h>
+
+#include "addpodcastpage.h"
+
+class Application;
+class NetworkAccessManager;
+
+class GPodderTopTagsPage : public AddPodcastPage {
+  Q_OBJECT
+
+ public:
+  explicit GPodderTopTagsPage(Application *app, QWidget *parent = nullptr);
+  ~GPodderTopTagsPage();
+
+  static const int kMaxTagCount;
+
+  virtual bool has_visible_widget() const { return false; }
+  virtual void Show();
+
+ private slots:
+  void TagListLoaded(mygpo::TagListPtr tag_list);
+  void TagListFailed();
+
+ private:
+  NetworkAccessManager *network_;
+  mygpo::ApiRequest *api_;
+
+  bool done_initial_load_;
+};
+
+#endif  // GPODDERTOPTAGSPAGE_H

src/podcasts/itunessearchpage.cpp

@@ -0,0 +1,133 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QJsonDocument>
+#include <QJsonParseError>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QUrl>
+#include <QUrlQuery>
+#include <QMessageBox>
+#include <QPushButton>
+
+#include "core/networkaccessmanager.h"
+#include "core/iconloader.h"
+#include "podcast.h"
+#include "podcastdiscoverymodel.h"
+#include "itunessearchpage.h"
+#include "ui_itunessearchpage.h"
+
+const char* ITunesSearchPage::kUrlBase = "http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?country=US&media=podcast";
+
+ITunesSearchPage::ITunesSearchPage(Application* app, QWidget* parent)
+    : AddPodcastPage(app, parent),
+      ui_(new Ui_ITunesSearchPage),
+      network_(new NetworkAccessManager(this)) {
+
+  ui_->setupUi(this);
+
+  QObject::connect(ui_->search, &QPushButton::clicked, this, &ITunesSearchPage::SearchClicked);
+  setWindowIcon(IconLoader::Load("itunes"));
+
+}
+
+ITunesSearchPage::~ITunesSearchPage() { delete ui_; }
+
+void ITunesSearchPage::SearchClicked() {
+
+  emit Busy(true);
+
+  QUrl url(QUrl::fromEncoded(kUrlBase));
+  QUrlQuery url_query;
+  url_query.addQueryItem("term", ui_->query->text());
+  url.setQuery(url_query);
+
+  QNetworkReply *reply = network_->get(QNetworkRequest(url));
+  QObject::connect(reply, &QNetworkReply::finished, this, [this, reply]() { SearchFinished(reply); });
+
+}
+
+void ITunesSearchPage::SearchFinished(QNetworkReply* reply) {
+
+  reply->deleteLater();
+  emit Busy(false);
+
+  model()->clear();
+
+  // Was there a network error?
+  if (reply->error() != QNetworkReply::NoError) {
+    QMessageBox::warning(this, tr("Failed to fetch podcasts"), reply->errorString());
+    return;
+  }
+
+  QJsonParseError error;
+  QJsonDocument json_document = QJsonDocument::fromJson(reply->readAll(), &error);
+
+  if (error.error != QJsonParseError::NoError) {
+    QMessageBox::warning(this, tr("Failed to fetch podcasts"), tr("There was a problem parsing the response from the iTunes Store"));
+    return;
+  }
+
+  QJsonObject json_data = json_document.object();
+
+  // Was there an error message in the JSON?
+  if (json_data.contains("errorMessage")) {
+    QMessageBox::warning(this, tr("Failed to fetch podcasts"), json_data["errorMessage"].toString());
+    return;
+  }
+
+  QJsonArray array = json_data["results"].toArray();
+  for (const QJsonValueRef &result : array) {
+    if (!result.isObject()) continue;
+    QJsonObject json_result = result.toObject();
+    if (json_result["kind"].toString() != "podcast") {
+      continue;
+    }
+    
+    if (!json_result.contains("artistName") ||
+        !json_result.contains("trackName") ||
+        !json_result.contains("feedUrl") ||
+        !json_result.contains("trackViewUrl") ||
+        !json_result.contains("artworkUrl30") ||
+        !json_result.contains("artworkUrl100")) {
+      continue;
+    }
+
+    Podcast podcast;
+    podcast.set_author(json_result["artistName"].toString());
+    podcast.set_title(json_result["trackName"].toString());
+    podcast.set_url(QUrl(json_result["feedUrl"].toString()));
+    podcast.set_link(QUrl(json_result["trackViewUrl"].toString()));
+    podcast.set_image_url_small(QUrl(json_result["artworkUrl30"].toString()));
+    podcast.set_image_url_large(QUrl(json_result["artworkUrl100"].toString()));
+
+    model()->appendRow(model()->CreatePodcastItem(podcast));
+  }
+
+}
+
+void ITunesSearchPage::Show() { ui_->query->setFocus(); }

src/podcasts/itunessearchpage.h

@@ -0,0 +1,56 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ITUNESSEARCHPAGE_H
+#define ITUNESSEARCHPAGE_H
+
+#include "addpodcastpage.h"
+
+class Ui_ITunesSearchPage;
+
+class QNetworkReply;
+
+class NetworkAccessManager;
+
+class ITunesSearchPage : public AddPodcastPage {
+  Q_OBJECT
+
+ public:
+  ITunesSearchPage(Application *app, QWidget *parent);
+  ~ITunesSearchPage();
+
+  void Show();
+
+ private slots:
+  void SearchClicked();
+  void SearchFinished(QNetworkReply *reply);
+
+ private:
+  static const char *kUrlBase;
+
+  Ui_ITunesSearchPage *ui_;
+
+  NetworkAccessManager *network_;
+};
+
+#endif  // ITUNESSEARCHPAGE_H

src/podcasts/itunessearchpage.ui

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ITunesSearchPage</class>
+ <widget class="QWidget" name="ITunesSearchPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>516</width>
+    <height>69</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Search iTunes</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Enter search terms below to find podcasts in the iTunes Store</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLineEdit" name="query"/>
+     </item>
+     <item>
+      <widget class="QPushButton" name="search">
+       <property name="text">
+        <string>Search</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <connections>
+  <connection>
+   <sender>query</sender>
+   <signal>returnPressed()</signal>
+   <receiver>search</receiver>
+   <slot>click()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>237</x>
+     <y>52</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>461</x>
+     <y>55</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/podcasts/opmlcontainer.h

@@ -0,0 +1,45 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef OPMLCONTAINER_H
+#define OPMLCONTAINER_H
+
+#include <QList>
+#include <QString>
+#include <QUrl>
+
+#include "podcast.h"
+
+class OpmlContainer {
+ public:
+  // Only set for the top-level container
+  QUrl url;
+
+  QString name;
+  QList<OpmlContainer> containers;
+  PodcastList feeds;
+};
+
+Q_DECLARE_METATYPE(OpmlContainer)
+
+#endif  // OPMLCONTAINER_H

src/podcasts/podcast.cpp

@@ -0,0 +1,194 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QSharedData>
+#include <QVariant>
+#include <QVariantMap>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+#include <QDataStream>
+#include <QDateTime>
+#include <QSqlQuery>
+
+#include "core/utilities.h"
+
+#include "podcast.h"
+
+#include <Podcast.h>
+
+const QStringList Podcast::kColumns = QStringList() << "url"
+                                                    << "title"
+                                                    << "description"
+                                                    << "copyright"
+                                                    << "link"
+                                                    << "image_url_large"
+                                                    << "image_url_small"
+                                                    << "author"
+                                                    << "owner_name"
+                                                    << "owner_email"
+                                                    << "last_updated"
+                                                    << "last_update_error"
+                                                    << "extra";
+
+const QString Podcast::kColumnSpec = Podcast::kColumns.join(", ");
+const QString Podcast::kJoinSpec = Utilities::Prepend("p.", Podcast::kColumns).join(", ");
+const QString Podcast::kBindSpec = Utilities::Prepend(":", Podcast::kColumns).join(", ");
+const QString Podcast::kUpdateSpec = Utilities::Updateify(Podcast::kColumns).join(", ");
+
+struct Podcast::Private : public QSharedData {
+  Private();
+
+  int database_id_;
+  QUrl url_;
+
+  QString title_;
+  QString description_;
+  QString copyright_;
+  QUrl link_;
+  QUrl image_url_large_;
+  QUrl image_url_small_;
+
+  // iTunes extensions
+  QString author_;
+  QString owner_name_;
+  QString owner_email_;
+
+  QDateTime last_updated_;
+  QString last_update_error_;
+
+  QVariantMap extra_;
+
+  // These are stored in a different table
+  PodcastEpisodeList episodes_;
+};
+
+Podcast::Private::Private() : database_id_(-1) {}
+
+Podcast::Podcast() : d(new Private) {}
+
+Podcast::Podcast(const Podcast &other) : d(other.d) {}
+
+Podcast::~Podcast() {}
+
+Podcast &Podcast::operator=(const Podcast &other) {
+  d = other.d;
+  return *this;
+}
+
+int Podcast::database_id() const { return d->database_id_; }
+const QUrl &Podcast::url() const { return d->url_; }
+const QString &Podcast::title() const { return d->title_; }
+const QString &Podcast::description() const { return d->description_; }
+const QString &Podcast::copyright() const { return d->copyright_; }
+const QUrl &Podcast::link() const { return d->link_; }
+const QUrl &Podcast::image_url_large() const { return d->image_url_large_; }
+const QUrl &Podcast::image_url_small() const { return d->image_url_small_; }
+const QString &Podcast::author() const { return d->author_; }
+const QString &Podcast::owner_name() const { return d->owner_name_; }
+const QString &Podcast::owner_email() const { return d->owner_email_; }
+const QDateTime &Podcast::last_updated() const { return d->last_updated_; }
+const QString &Podcast::last_update_error() const {
+  return d->last_update_error_;
+}
+const QVariantMap &Podcast::extra() const { return d->extra_; }
+QVariant Podcast::extra(const QString &key) const { return d->extra_[key]; }
+
+void Podcast::set_database_id(const int v) { d->database_id_ = v; }
+void Podcast::set_url(const QUrl &v) { d->url_ = v; }
+void Podcast::set_title(const QString &v) { d->title_ = v; }
+void Podcast::set_description(const QString &v) { d->description_ = v; }
+void Podcast::set_copyright(const QString &v) { d->copyright_ = v; }
+void Podcast::set_link(const QUrl &v) { d->link_ = v; }
+void Podcast::set_image_url_large(const QUrl &v) { d->image_url_large_ = v; }
+void Podcast::set_image_url_small(const QUrl &v) { d->image_url_small_ = v; }
+void Podcast::set_author(const QString &v) { d->author_ = v; }
+void Podcast::set_owner_name(const QString &v) { d->owner_name_ = v; }
+void Podcast::set_owner_email(const QString &v) { d->owner_email_ = v; }
+void Podcast::set_last_updated(const QDateTime &v) { d->last_updated_ = v; }
+void Podcast::set_last_update_error(const QString &v) { d->last_update_error_ = v; }
+void Podcast::set_extra(const QVariantMap &v) { d->extra_ = v; }
+void Podcast::set_extra(const QString &key, const QVariant &value) { d->extra_[key] = value; }
+
+const PodcastEpisodeList &Podcast::episodes() const { return d->episodes_; }
+PodcastEpisodeList* Podcast::mutable_episodes() { return &d->episodes_; }
+void Podcast::set_episodes(const PodcastEpisodeList &v) { d->episodes_ = v; }
+void Podcast::add_episode(const PodcastEpisode &episode) { d->episodes_.append(episode); }
+
+void Podcast::InitFromQuery(const QSqlQuery &query) {
+
+  d->database_id_ = query.value(0).toInt();
+  d->url_ = QUrl::fromEncoded(query.value(1).toByteArray());
+  d->title_ = query.value(2).toString();
+  d->description_ = query.value(3).toString();
+  d->copyright_ = query.value(4).toString();
+  d->link_ = QUrl::fromEncoded(query.value(5).toByteArray());
+  d->image_url_large_ = QUrl::fromEncoded(query.value(6).toByteArray());
+  d->image_url_small_ = QUrl::fromEncoded(query.value(7).toByteArray());
+  d->author_ = query.value(8).toString();
+  d->owner_name_ = query.value(9).toString();
+  d->owner_email_ = query.value(10).toString();
+  d->last_updated_ = QDateTime::fromSecsSinceEpoch(query.value(11).toUInt());
+  d->last_update_error_ = query.value(12).toString();
+
+  QDataStream extra_stream(query.value(13).toByteArray());
+  extra_stream >> d->extra_;
+
+}
+
+void Podcast::BindToQuery(QSqlQuery* query) const {
+
+  query->bindValue(":url", d->url_.toEncoded());
+  query->bindValue(":title", d->title_);
+  query->bindValue(":description", d->description_);
+  query->bindValue(":copyright", d->copyright_);
+  query->bindValue(":link", d->link_.toEncoded());
+  query->bindValue(":image_url_large", d->image_url_large_.toEncoded());
+  query->bindValue(":image_url_small", d->image_url_small_.toEncoded());
+  query->bindValue(":author", d->author_);
+  query->bindValue(":owner_name", d->owner_name_);
+  query->bindValue(":owner_email", d->owner_email_);
+  query->bindValue(":last_updated", d->last_updated_.toSecsSinceEpoch());
+  query->bindValue(":last_update_error", d->last_update_error_);
+
+  QByteArray extra;
+  QDataStream extra_stream(&extra, QIODevice::WriteOnly);
+  extra_stream << d->extra_;
+
+  query->bindValue(":extra", extra);
+
+}
+
+void Podcast::InitFromGpo(const mygpo::Podcast* podcast) {
+
+  d->url_ = podcast->url();
+  d->title_ = podcast->title();
+  d->description_ = podcast->description();
+  d->link_ = podcast->website();
+  d->image_url_large_ = podcast->logoUrl();
+
+  set_extra("gpodder:subscribers", podcast->subscribers());
+  set_extra("gpodder:subscribers_last_week", podcast->subscribersLastWeek());
+  set_extra("gpodder:page", podcast->mygpoUrl());
+
+}

src/podcasts/podcast.h

@@ -0,0 +1,114 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCAST_H
+#define PODCAST_H
+
+#include <QSharedData>
+#include <QSharedDataPointer>
+#include <QVariant>
+#include <QVariantMap>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+#include <QSqlQuery>
+
+#include "podcastepisode.h"
+
+namespace mygpo {
+class Podcast;
+}  // namespace mygpo
+
+class Podcast {
+ public:
+  Podcast();
+  Podcast(const Podcast &other);
+  ~Podcast();
+
+  static const QStringList kColumns;
+  static const QString kColumnSpec;
+  static const QString kJoinSpec;
+  static const QString kBindSpec;
+  static const QString kUpdateSpec;
+
+  void InitFromQuery(const QSqlQuery &query);
+  void InitFromGpo(const mygpo::Podcast *podcast);
+
+  void BindToQuery(QSqlQuery *query) const;
+
+  bool is_valid() const { return database_id() != -1; }
+
+  int database_id() const;
+  const QUrl &url() const;
+  const QString &title() const;
+  const QString &description() const;
+  const QString &copyright() const;
+  const QUrl &link() const;
+  const QUrl &image_url_large() const;
+  const QUrl &image_url_small() const;
+  const QString &author() const;
+  const QString &owner_name() const;
+  const QString &owner_email() const;
+  const QDateTime &last_updated() const;
+  const QString &last_update_error() const;
+  const QVariantMap &extra() const;
+  QVariant extra(const QString &key) const;
+
+  void set_database_id(const int v);
+  void set_url(const QUrl &v);
+  void set_title(const QString &v);
+  void set_description(const QString &v);
+  void set_copyright(const QString &v);
+  void set_link(const QUrl &v);
+  void set_image_url_large(const QUrl &v);
+  void set_image_url_small(const QUrl &v);
+  void set_author(const QString &v);
+  void set_owner_name(const QString &v);
+  void set_owner_email(const QString &v);
+  void set_last_updated(const QDateTime &v);
+  void set_last_update_error(const QString &v);
+  void set_extra(const QVariantMap &v);
+  void set_extra(const QString &key, const QVariant &value);
+
+  // Small images are suitable for 16x16 icons in lists.  Large images are used in detailed information displays.
+  const QUrl &ImageUrlLarge() const { return image_url_large().isValid() ? image_url_large() : image_url_small(); }
+  const QUrl &ImageUrlSmall() const { return image_url_small().isValid() ? image_url_small() : image_url_large(); }
+
+  // These are stored in a different database table, and aren't loaded or persisted by InitFromQuery or BindToQuery.
+  const PodcastEpisodeList &episodes() const;
+  PodcastEpisodeList *mutable_episodes();
+  void set_episodes(const PodcastEpisodeList &v);
+  void add_episode(const PodcastEpisode &episode);
+
+  Podcast &operator=(const Podcast &other);
+
+ private:
+  struct Private;
+  QSharedDataPointer<Private> d;
+};
+Q_DECLARE_METATYPE(Podcast)
+
+typedef QList<Podcast> PodcastList;
+Q_DECLARE_METATYPE(QList<Podcast>)
+
+#endif  // PODCAST_H

src/podcasts/podcastbackend.cpp

@@ -0,0 +1,368 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QMutexLocker>
+#include <QSqlDatabase>
+#include <QSqlQuery>
+#include <QUrl>
+
+#include "core/application.h"
+#include "core/database.h"
+#include "core/logging.h"
+#include "core/scopedtransaction.h"
+
+#include "podcastbackend.h"
+
+PodcastBackend::PodcastBackend(Application *app, QObject *parent)
+    : QObject(parent), app_(app), db_(app->database()) {}
+
+void PodcastBackend::Subscribe(Podcast *podcast) {
+
+  // If this podcast is already in the database, do nothing
+  if (podcast->is_valid()) {
+    return;
+  }
+
+  // If there's an entry in the database with the same URL, take its data.
+  Podcast existing_podcast = GetSubscriptionByUrl(podcast->url());
+  if (existing_podcast.is_valid()) {
+    *podcast = existing_podcast;
+    return;
+  }
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+  ScopedTransaction t(&db);
+
+  // Insert the podcast.
+  QSqlQuery q(db);
+  q.prepare("INSERT INTO podcasts (" + Podcast::kColumnSpec + ") VALUES (" + Podcast::kBindSpec + ")");
+  podcast->BindToQuery(&q);
+
+  q.exec();
+  if (db_->CheckErrors(q)) return;
+
+  // Update the database ID.
+  const int database_id = q.lastInsertId().toInt();
+  podcast->set_database_id(database_id);
+
+  // Update the IDs of any episodes.
+  PodcastEpisodeList *episodes = podcast->mutable_episodes();
+  for (auto it = episodes->begin(); it != episodes->end(); ++it) {
+    it->set_podcast_database_id(database_id);
+  }
+
+  // Add those episodes to the database.
+  AddEpisodes(episodes, &db);
+
+  t.Commit();
+
+  emit SubscriptionAdded(*podcast);
+}
+
+void PodcastBackend::Unsubscribe(const Podcast &podcast) {
+
+  // If this podcast is not already in the database, do nothing
+  if (!podcast.is_valid()) {
+    return;
+  }
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+  ScopedTransaction t(&db);
+
+  // Remove the podcast.
+  QSqlQuery q(db);
+  q.prepare("DELETE FROM podcasts WHERE ROWID = :id");
+  q.bindValue(":id", podcast.database_id());
+  q.exec();
+  if (db_->CheckErrors(q)) return;
+
+  // Remove all episodes in the podcast
+  q.prepare("DELETE FROM podcast_episodes WHERE podcast_id = :id");
+  q.bindValue(":id", podcast.database_id());
+  q.exec();
+  if (db_->CheckErrors(q)) return;
+
+  t.Commit();
+
+  emit SubscriptionRemoved(podcast);
+
+}
+
+void PodcastBackend::AddEpisodes(PodcastEpisodeList *episodes, QSqlDatabase *db) {
+
+  QSqlQuery q(*db);
+  q.prepare("INSERT INTO podcast_episodes (" + PodcastEpisode::kColumnSpec + ") VALUES (" + PodcastEpisode::kBindSpec + ")");
+
+  for (auto it = episodes->begin(); it != episodes->end(); ++it) {
+    it->BindToQuery(&q);
+    q.exec();
+    if (db_->CheckErrors(q)) continue;
+
+    const int database_id = q.lastInsertId().toInt();
+    it->set_database_id(database_id);
+  }
+
+}
+
+void PodcastBackend::AddEpisodes(PodcastEpisodeList *episodes) {
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+  ScopedTransaction t(&db);
+
+  AddEpisodes(episodes, &db);
+  t.Commit();
+
+  emit EpisodesAdded(*episodes);
+
+}
+
+void PodcastBackend::UpdateEpisodes(const PodcastEpisodeList &episodes) {
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+  ScopedTransaction t(&db);
+
+  QSqlQuery q(db);
+  q.prepare("UPDATE podcast_episodes SET listened = :listened, listened_date = :listened_date, downloaded = :downloaded, local_url = :local_url WHERE ROWID = :id");
+
+  for (const PodcastEpisode &episode : episodes) {
+    q.bindValue(":listened", episode.listened());
+    q.bindValue(":listened_date", episode.listened_date().toSecsSinceEpoch());
+    q.bindValue(":downloaded", episode.downloaded());
+    q.bindValue(":local_url", episode.local_url().toEncoded());
+    q.bindValue(":id", episode.database_id());
+    q.exec();
+    db_->CheckErrors(q);
+  }
+
+  t.Commit();
+
+  emit EpisodesUpdated(episodes);
+
+}
+
+PodcastList PodcastBackend::GetAllSubscriptions() {
+
+  PodcastList ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + Podcast::kColumnSpec + " FROM podcasts");
+  q.exec();
+  if (db_->CheckErrors(q)) return ret;
+
+  while (q.next()) {
+    Podcast podcast;
+    podcast.InitFromQuery(q);
+    ret << podcast;
+  }
+
+  return ret;
+
+}
+
+Podcast PodcastBackend::GetSubscriptionById(const int id) {
+
+  Podcast ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + Podcast::kColumnSpec + " FROM podcasts WHERE ROWID = :id");
+  q.bindValue(":id", id);
+  q.exec();
+  if (!db_->CheckErrors(q) && q.next()) {
+    ret.InitFromQuery(q);
+  }
+
+  return ret;
+
+}
+
+Podcast PodcastBackend::GetSubscriptionByUrl(const QUrl &url) {
+
+  Podcast ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + Podcast::kColumnSpec + " FROM podcasts WHERE url = :url");
+  q.bindValue(":url", url.toEncoded());
+  q.exec();
+  if (!db_->CheckErrors(q) && q.next()) {
+    ret.InitFromQuery(q);
+  }
+
+  return ret;
+
+}
+
+PodcastEpisodeList PodcastBackend::GetEpisodes(const int podcast_id) {
+
+  PodcastEpisodeList ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE podcast_id = :id ORDER BY publication_date DESC");
+  q.bindValue(":id", podcast_id);
+  q.exec();
+  if (db_->CheckErrors(q)) return ret;
+
+  while (q.next()) {
+    PodcastEpisode episode;
+    episode.InitFromQuery(q);
+    ret << episode;
+  }
+
+  return ret;
+
+}
+
+PodcastEpisode PodcastBackend::GetEpisodeById(const int id) {
+
+  PodcastEpisode ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE ROWID = :id");
+  q.bindValue(":id", id);
+  q.exec();
+  if (!db_->CheckErrors(q) && q.next()) {
+    ret.InitFromQuery(q);
+  }
+
+  return ret;
+
+}
+
+PodcastEpisode PodcastBackend::GetEpisodeByUrl(const QUrl &url) {
+
+  PodcastEpisode ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE url = :url");
+  q.bindValue(":url", url.toEncoded());
+  q.exec();
+  if (!db_->CheckErrors(q) && q.next()) {
+    ret.InitFromQuery(q);
+  }
+
+  return ret;
+
+}
+
+PodcastEpisode PodcastBackend::GetEpisodeByUrlOrLocalUrl(const QUrl &url) {
+
+  PodcastEpisode ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE url = :url OR local_url = :url");
+  q.bindValue(":url", url.toEncoded());
+  q.exec();
+  if (!db_->CheckErrors(q) && q.next()) {
+    ret.InitFromQuery(q);
+  }
+
+  return ret;
+
+}
+
+PodcastEpisodeList PodcastBackend::GetOldDownloadedEpisodes(const QDateTime &max_listened_date) {
+
+  PodcastEpisodeList ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE downloaded = 'true' AND listened_date <= :max_listened_date");
+  q.bindValue(":max_listened_date", max_listened_date.toSecsSinceEpoch());
+  q.exec();
+  if (db_->CheckErrors(q)) return ret;
+
+  while (q.next()) {
+    PodcastEpisode episode;
+    episode.InitFromQuery(q);
+    ret << episode;
+  }
+
+  return ret;
+
+}
+
+PodcastEpisode PodcastBackend::GetOldestDownloadedListenedEpisode() {
+
+  PodcastEpisode ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE downloaded = 'true' AND listened = 'true' ORDER BY listened_date ASC");
+  q.exec();
+  if (db_->CheckErrors(q)) return ret;
+  q.next();
+  ret.InitFromQuery(q);
+
+  return ret;
+
+}
+
+PodcastEpisodeList PodcastBackend::GetNewDownloadedEpisodes() {
+
+  PodcastEpisodeList ret;
+
+  QMutexLocker l(db_->Mutex());
+  QSqlDatabase db(db_->Connect());
+
+  QSqlQuery q(db);
+  q.prepare("SELECT ROWID, " + PodcastEpisode::kColumnSpec + " FROM podcast_episodes WHERE downloaded = 'true' AND listened = 'false'");
+  q.exec();
+  if (db_->CheckErrors(q)) return ret;
+
+  while (q.next()) {
+    PodcastEpisode episode;
+    episode.InitFromQuery(q);
+    ret << episode;
+  }
+
+  return ret;
+
+}

src/podcasts/podcastbackend.h

@@ -0,0 +1,98 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTBACKEND_H
+#define PODCASTBACKEND_H
+
+#include <QObject>
+#include <QDateTime>
+#include <QUrl>
+
+#include "podcast.h"
+
+class QSqlDatabase;
+
+class Application;
+class Database;
+
+class PodcastBackend : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit PodcastBackend(Application *app, QObject *parent = nullptr);
+
+  // Adds the podcast and any included Episodes to the database.
+  // Updates the podcast with a database ID.
+  // If this podcast already has an ID set, this function does nothing.
+  // If a podcast with this URL already exists in the database,
+  // this function just updates the ID field in the provided podcast.
+  void Subscribe(Podcast *podcast);
+
+  // Removes the Podcast with the given ID from the database.
+  // Also removes any episodes associated with this podcast.
+  void Unsubscribe(const Podcast &podcast);
+
+  // Returns a list of all the subscribed podcasts.
+  // For efficiency the Podcast objects returned won't contain any PodcastEpisode objects - get them separately if you want them.
+  PodcastList GetAllSubscriptions();
+  Podcast GetSubscriptionById(const int id);
+  Podcast GetSubscriptionByUrl(const QUrl &url);
+
+  // Returns podcast episodes that match various keys.  All these queries are indexed.
+  PodcastEpisodeList GetEpisodes(const int podcast_id);
+  PodcastEpisode GetEpisodeById(const int id);
+  PodcastEpisode GetEpisodeByUrl(const QUrl &url);
+  PodcastEpisode GetEpisodeByUrlOrLocalUrl(const QUrl &url);
+  PodcastEpisode GetOldestDownloadedListenedEpisode();
+
+  // Returns a list of episodes that have local data (downloaded=true) but were last listened to before the given QDateTime.
+  // This query is NOT indexed so it involves a full search of the table.
+  PodcastEpisodeList GetOldDownloadedEpisodes(const QDateTime &max_listened_date);
+  PodcastEpisodeList GetNewDownloadedEpisodes();
+
+  // Adds episodes to the database.  Every episode must have a valid podcast_database_id set already.
+  void AddEpisodes(PodcastEpisodeList *episodes);
+
+  // Updates the editable fields (listened, listened_date, downloaded, and local_url) on episodes that must already exist in the database.
+  void UpdateEpisodes(const PodcastEpisodeList &episodes);
+
+ signals:
+  void SubscriptionAdded(const Podcast &podcast);
+  void SubscriptionRemoved(const Podcast &podcast);
+
+  // Emitted when episodes are added to a subscription that *already exists*.
+  void EpisodesAdded(const PodcastEpisodeList &episodes);
+
+  // Emitted when existing episodes are updated.
+  void EpisodesUpdated(const PodcastEpisodeList &episodes);
+
+ private:
+  // Adds each episode to the database, setting their IDs after inserting each one.
+  void AddEpisodes(PodcastEpisodeList *episodes, QSqlDatabase *db);
+
+ private:
+  Application *app_;
+  Database *db_;
+};
+
+#endif  // PODCASTBACKEND_H

src/podcasts/podcastdeleter.cpp

@@ -0,0 +1,124 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QFile>
+#include <QDateTime>
+#include <QTimer>
+#include <QSettings>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/timeconstants.h"
+#include "core/utilities.h"
+#include "collection/collectiondirectorymodel.h"
+#include "collection/collectionmodel.h"
+#include "podcastbackend.h"
+#include "podcastdeleter.h"
+
+const char *PodcastDeleter::kSettingsGroup = "Podcasts";
+const int PodcastDeleter::kAutoDeleteCheckIntervalMsec = 60 * 6 * 60 * kMsecPerSec;
+
+PodcastDeleter::PodcastDeleter(Application *app, QObject *parent)
+    : QObject(parent),
+      app_(app),
+      backend_(app_->podcast_backend()),
+      delete_after_secs_(0),
+      auto_delete_timer_(new QTimer(this)) {
+
+  ReloadSettings();
+  auto_delete_timer_->setSingleShot(true);
+  AutoDelete();
+  QObject::connect(auto_delete_timer_, &QTimer::timeout, this, &PodcastDeleter::AutoDelete);
+  QObject::connect(app_, &Application::SettingsChanged, this, &PodcastDeleter::ReloadSettings);
+
+}
+
+void PodcastDeleter::DeleteEpisode(const PodcastEpisode &episode) {
+
+  // Delete the local file
+  if (!QFile::remove(episode.local_url().toLocalFile())) {
+    qLog(Warning) << "The local file" << episode.local_url().toLocalFile() << "could not be removed";
+  }
+
+  // Update the episode in the DB
+  PodcastEpisode episode_copy(episode);
+  episode_copy.set_downloaded(false);
+  episode_copy.set_local_url(QUrl());
+  episode_copy.set_listened_date(QDateTime());
+  backend_->UpdateEpisodes(PodcastEpisodeList() << episode_copy);
+
+}
+
+void PodcastDeleter::ReloadSettings() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  delete_after_secs_ = s.value("delete_after", 0).toInt();
+  s.endGroup();
+
+  AutoDelete();
+
+}
+
+void PodcastDeleter::AutoDelete() {
+
+  if (delete_after_secs_ <= 0) {
+    return;
+  }
+  auto_delete_timer_->stop();
+  QDateTime max_date = QDateTime::currentDateTime();
+  qint64 timeout_ms;
+  PodcastEpisode oldest_episode;
+  QDateTime oldest_episode_time;
+  max_date = max_date.addSecs(-delete_after_secs_);
+
+  PodcastEpisodeList old_episodes = backend_->GetOldDownloadedEpisodes(max_date);
+
+  qLog(Info) << "Deleting" << old_episodes.count()
+             << "episodes because they were last listened to"
+             << (delete_after_secs_ / kSecsPerDay) << "days ago";
+
+  for (const PodcastEpisode& episode : old_episodes) {
+    DeleteEpisode(episode);
+  }
+
+  oldest_episode = backend_->GetOldestDownloadedListenedEpisode();
+  if (!oldest_episode.listened_date().isValid()) {
+    oldest_episode_time = QDateTime::currentDateTime();
+  }
+  else {
+    oldest_episode_time = oldest_episode.listened_date();
+  }
+
+  timeout_ms = QDateTime::currentDateTime().toMSecsSinceEpoch();
+  timeout_ms -= oldest_episode_time.toMSecsSinceEpoch();
+  timeout_ms = (delete_after_secs_ * kMsecPerSec) - timeout_ms;
+  qLog(Info) << "Timeout for autodelete set to:" << timeout_ms << "ms";
+  if (timeout_ms >= 0) {
+    auto_delete_timer_->setInterval(timeout_ms);
+  }
+  else {
+    auto_delete_timer_->setInterval(kAutoDeleteCheckIntervalMsec);
+  }
+  auto_delete_timer_->start();
+
+}

src/podcasts/podcastdeleter.h

@@ -0,0 +1,56 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTDELETER_H
+#define PODCASTDELETER_H
+
+#include <QObject>
+
+#include "podcast.h"
+#include "podcastepisode.h"
+
+class QTimer;
+
+class Application;
+class PodcastBackend;
+
+class PodcastDeleter : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit PodcastDeleter(Application *app, QObject *parent = nullptr);
+  static const char *kSettingsGroup;
+  static const int kAutoDeleteCheckIntervalMsec;
+
+ public slots:
+  // Deletes downloaded data for this episode
+  void DeleteEpisode(const PodcastEpisode &episode);
+  void AutoDelete();
+  void ReloadSettings();
+
+ private:
+  Application *app_;
+  PodcastBackend *backend_;
+  int delete_after_secs_;
+  QTimer *auto_delete_timer_;
+};
+
+#endif  // PODCASTDELETER_H

src/podcasts/podcastdiscoverymodel.cpp

@@ -0,0 +1,125 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "podcastdiscoverymodel.h"
+
+#include <QStandardItemModel>
+#include <QStandardItem>
+#include <QSet>
+#include <QString>
+#include <QUrl>
+#include <QIcon>
+
+#include "core/application.h"
+#include "core/iconloader.h"
+#include "core/standarditemiconloader.h"
+#include "opmlcontainer.h"
+#include "podcast.h"
+
+PodcastDiscoveryModel::PodcastDiscoveryModel(Application *app, QObject *parent)
+    : QStandardItemModel(parent),
+      app_(app),
+      icon_loader_(new StandardItemIconLoader(app->album_cover_loader(), this)),
+      default_icon_(IconLoader::Load("podcast")) {
+
+  icon_loader_->SetModel(this);
+
+}
+
+QVariant PodcastDiscoveryModel::data(const QModelIndex &idx, int role) const {
+
+  if (idx.isValid() && role == Qt::DecorationRole && !QStandardItemModel::data(idx, Role_StartedLoadingImage).toBool()) {
+    const QUrl image_url = QStandardItemModel::data(idx, Role_ImageUrl).toUrl();
+    if (image_url.isValid()) {
+      const_cast<PodcastDiscoveryModel*>(this)->LazyLoadImage(image_url, idx);
+    }
+  }
+
+  return QStandardItemModel::data(idx, role);
+
+}
+
+QStandardItem *PodcastDiscoveryModel::CreatePodcastItem(const Podcast &podcast) {
+
+  QStandardItem *item = new QStandardItem;
+  item->setIcon(default_icon_);
+  item->setText(podcast.title());
+  item->setData(QVariant::fromValue(podcast), Role_Podcast);
+  item->setData(Type_Podcast, Role_Type);
+  item->setData(podcast.ImageUrlSmall(), Role_ImageUrl);
+  return item;
+
+}
+
+QStandardItem *PodcastDiscoveryModel::CreateFolder(const QString &name) {
+
+  if (folder_icon_.isNull()) {
+    folder_icon_ = IconLoader::Load("folder");
+  }
+
+  QStandardItem *item = new QStandardItem;
+  item->setIcon(folder_icon_);
+  item->setText(name);
+  item->setData(Type_Folder, Role_Type);
+  return item;
+
+}
+
+QStandardItem *PodcastDiscoveryModel::CreateOpmlContainerItem(const OpmlContainer &container) {
+
+  QStandardItem *item = CreateFolder(container.name);
+  CreateOpmlContainerItems(container, item);
+  return item;
+
+}
+
+void PodcastDiscoveryModel::CreateOpmlContainerItems(const OpmlContainer &container, QStandardItem *parent) {
+
+  for (const OpmlContainer &child : container.containers) {
+    QStandardItem *child_item = CreateOpmlContainerItem(child);
+    parent->appendRow(child_item);
+  }
+
+  for (const Podcast &child : container.feeds) {
+    QStandardItem *child_item = CreatePodcastItem(child);
+    parent->appendRow(child_item);
+  }
+
+}
+
+void PodcastDiscoveryModel::LazyLoadImage(const QUrl &url, const QModelIndex &idx) {
+
+  QStandardItem *item = itemFromIndex(idx);
+  item->setData(true, Role_StartedLoadingImage);
+  icon_loader_->LoadIcon(url, QUrl(), item);
+
+}
+
+QStandardItem *PodcastDiscoveryModel::CreateLoadingIndicator() {
+
+  QStandardItem *item = new QStandardItem;
+  item->setText(tr("Loading..."));
+  item->setData(Type_LoadingIndicator, Role_Type);
+  return item;
+
+}

src/podcasts/podcastdiscoverymodel.h

@@ -0,0 +1,79 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTDISCOVERYMODEL_H
+#define PODCASTDISCOVERYMODEL_H
+
+#include <QStandardItemModel>
+#include <QString>
+#include <QUrl>
+#include <QIcon>
+
+#include "covermanager/albumcoverloaderoptions.h"
+
+class Application;
+class OpmlContainer;
+class OpmlFeed;
+class Podcast;
+class StandardItemIconLoader;
+
+class PodcastDiscoveryModel : public QStandardItemModel {
+  Q_OBJECT
+
+ public:
+  explicit PodcastDiscoveryModel(Application *app, QObject *parent = nullptr);
+
+  enum Type {
+    Type_Folder,
+    Type_Podcast,
+    Type_LoadingIndicator
+  };
+
+  enum Role {
+    Role_Podcast = Qt::UserRole,
+    Role_Type,
+    Role_ImageUrl,
+    Role_StartedLoadingImage,
+    RoleCount
+  };
+
+  void CreateOpmlContainerItems(const OpmlContainer &container, QStandardItem *parent);
+  QStandardItem *CreateOpmlContainerItem(const OpmlContainer &container);
+  QStandardItem *CreatePodcastItem(const Podcast &podcast);
+  QStandardItem *CreateFolder(const QString &name);
+  QStandardItem *CreateLoadingIndicator();
+
+  QVariant data(const QModelIndex &idx, int role) const override;
+
+ private:
+  void LazyLoadImage(const QUrl &url, const QModelIndex &idx);
+
+ private:
+  Application *app_;
+  StandardItemIconLoader *icon_loader_;
+
+  QIcon default_icon_;
+  QIcon folder_icon_;
+};
+
+#endif  // PODCASTDISCOVERYMODEL_H

src/podcasts/podcastdownloader.cpp

@@ -0,0 +1,288 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "podcastdownloader.h"
+
+#include <QString>
+#include <QDateTime>
+#include <QDir>
+#include <QFile>
+#include <QFileInfo>
+#include <QList>
+#include <QString>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QSettings>
+#include <QTimer>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/networkaccessmanager.h"
+#include "core/tagreaderclient.h"
+#include "core/timeconstants.h"
+#include "core/utilities.h"
+#include "podcastbackend.h"
+
+const char *PodcastDownloader::kSettingsGroup = "Podcasts";
+
+Task::Task(const PodcastEpisode &episode, QFile *file, PodcastBackend *backend)
+    : file_(file),
+      episode_(episode),
+      backend_(backend),
+      network_(new NetworkAccessManager(this)),
+      req_(QNetworkRequest(episode.url())),
+      reply_(network_->get(req_)) {
+
+  QObject::connect(reply_, &QNetworkReply::readyRead, this, &Task::reading);
+  QObject::connect(reply_, &QNetworkReply::finished, this, &Task::finishedInternal);
+  QObject::connect(reply_, &QNetworkReply::downloadProgress, this, &Task::downloadProgressInternal);
+
+  emit ProgressChanged(episode_, PodcastDownload::Queued, 0);
+
+}
+
+PodcastEpisode Task::episode() const { return episode_; }
+
+void Task::reading() {
+
+  qint64 bytes = 0;
+  forever {
+    bytes = reply_->bytesAvailable();
+    if (bytes <= 0) break;
+
+    file_->write(reply_->read(bytes));
+  }
+
+}
+void Task::finishedPublic() {
+
+  disconnect(reply_, &QNetworkReply::readyRead, nullptr, nullptr);
+  disconnect(reply_, &QNetworkReply::downloadProgress, nullptr, nullptr);
+  disconnect(reply_, &QNetworkReply::finished, nullptr, nullptr);
+
+  emit ProgressChanged(episode_, PodcastDownload::NotDownloading, 0);
+
+  // Delete the file
+  file_->remove();
+
+  emit finished(this);
+
+}
+
+void Task::finishedInternal() {
+
+  reply_->deleteLater();
+
+  if (reply_->error() != QNetworkReply::NoError) {
+    qLog(Warning) << "Error downloading episode:" << reply_->errorString();
+    emit ProgressChanged(episode_, PodcastDownload::NotDownloading, 0);
+    // Delete the file
+    file_->remove();
+    emit finished(this);
+    reply_ = nullptr;
+    return;
+  }
+
+  qLog(Info) << "Download of" << file_->fileName() << "finished";
+
+  // Tell the database the episode has been updated.  Get it from the DB again in case the listened field changed in the mean time.
+  PodcastEpisode episode = episode_;
+  episode.set_downloaded(true);
+  episode.set_local_url(QUrl::fromLocalFile(file_->fileName()));
+  backend_->UpdateEpisodes(PodcastEpisodeList() << episode);
+  Podcast podcast = backend_->GetSubscriptionById(episode.podcast_database_id());
+  Song song = episode_.ToSong(podcast);
+
+  emit ProgressChanged(episode_, PodcastDownload::Finished, 0);
+
+  // I didn't ecountered even a single podcast with a correct metadata
+  TagReaderClient::Instance()->SaveFileBlocking(file_->fileName(), song);
+  emit finished(this);
+
+  reply_ = nullptr;
+
+}
+
+void Task::downloadProgressInternal(qint64 received, qint64 total) {
+
+  if (total <= 0) {
+    emit ProgressChanged(episode_, PodcastDownload::Downloading, 0);
+  }
+  else {
+    emit ProgressChanged(episode_, PodcastDownload::Downloading, static_cast<float>(received) / total * 100);
+  }
+
+}
+
+PodcastDownloader::PodcastDownloader(Application *app, QObject *parent)
+    : QObject(parent),
+      app_(app),
+      backend_(app_->podcast_backend()),
+      network_(new NetworkAccessManager(this)),
+      disallowed_filename_characters_("[^a-zA-Z0-9_~ -]"),
+      auto_download_(false) {
+
+  QObject::connect(backend_, &PodcastBackend::EpisodesAdded, this, &PodcastDownloader::EpisodesAdded);
+  QObject::connect(backend_, &PodcastBackend::SubscriptionAdded, this, &PodcastDownloader::SubscriptionAdded);
+  QObject::connect(app_, &Application::SettingsChanged, this, &PodcastDownloader::ReloadSettings);
+
+  ReloadSettings();
+
+}
+
+QString PodcastDownloader::DefaultDownloadDir() const {
+
+  return QDir::homePath() + "/Podcasts";
+
+}
+
+void PodcastDownloader::ReloadSettings() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  auto_download_ = s.value("auto_download", false).toBool();
+  download_dir_ = s.value("download_dir", DefaultDownloadDir()).toString();
+
+}
+
+QString PodcastDownloader::FilenameForEpisode(const QString &directory, const PodcastEpisode &episode) const {
+
+  const QString file_extension = QFileInfo(episode.url().path()).suffix();
+  int count = 0;
+
+  // The file name contains the publication date and episode title
+  QString base_filename = episode.publication_date().date().toString(Qt::ISODate) + "-" + SanitiseFilenameComponent(episode.title());
+
+  // Add numbers on to the end of the filename until we find one that doesn't exist.
+  forever {
+    QString filename;
+
+    if (count == 0) {
+      filename = QString("%1/%2.%3").arg(directory, base_filename, file_extension);
+    }
+    else {
+      filename = QString("%1/%2 (%3).%4").arg(directory, base_filename, QString::number(count), file_extension);
+    }
+
+    if (!QFile::exists(filename)) {
+      return filename;
+    }
+
+    ++count;
+  }
+
+}
+
+void PodcastDownloader::DownloadEpisode(const PodcastEpisode &episode) {
+
+  for (Task *tas : list_tasks_) {
+    if (tas->episode().database_id() == episode.database_id()) {
+      return;
+    }
+  }
+
+  Podcast podcast = backend_->GetSubscriptionById(episode.podcast_database_id());
+  if (!podcast.is_valid()) {
+    qLog(Warning) << "The podcast that contains episode" << episode.url() << "doesn't exist any more";
+    return;
+  }
+  const QString directory = download_dir_ + "/" + SanitiseFilenameComponent(podcast.title());
+  const QString filepath = FilenameForEpisode(directory, episode);
+
+  // Open the output file
+  if (!QDir(directory).exists()) QDir().mkpath(directory);
+  QFile *file = new QFile(filepath);
+  if (!file->open(QIODevice::WriteOnly)) {
+    qLog(Warning) << "Could not open the file" << filepath << "for writing";
+    return;
+  }
+
+  Task *task = new Task(episode, file, backend_);
+
+  list_tasks_ << task;
+  qLog(Info) << "Downloading" << task->episode().url() << "to" << filepath;
+  QObject::connect(task, &Task::finished, this, &PodcastDownloader::ReplyFinished);
+  QObject::connect(task, &Task::ProgressChanged, this, &PodcastDownloader::ProgressChanged);
+
+}
+
+void PodcastDownloader::ReplyFinished(Task *task) {
+
+  list_tasks_.removeAll(task);
+  delete task;
+
+}
+
+QString PodcastDownloader::SanitiseFilenameComponent(const QString &text) const {
+
+  return QString(text).replace(disallowed_filename_characters_, " ") .simplified();
+
+}
+
+void PodcastDownloader::SubscriptionAdded(const Podcast &podcast) {
+
+  EpisodesAdded(podcast.episodes());
+
+}
+
+void PodcastDownloader::EpisodesAdded(const PodcastEpisodeList &episodes) {
+
+  if (auto_download_) {
+    for (const PodcastEpisode &episode : episodes) {
+      DownloadEpisode(episode);
+    }
+  }
+
+}
+
+PodcastEpisodeList PodcastDownloader::EpisodesDownloading(const PodcastEpisodeList &episodes) {
+
+  PodcastEpisodeList ret;
+  for (Task *tas : list_tasks_) {
+    for (const PodcastEpisode &episode : episodes) {
+      if (tas->episode().database_id() == episode.database_id()) {
+        ret << episode;
+      }
+    }
+  }
+  return ret;
+
+}
+
+void PodcastDownloader::cancelDownload(const PodcastEpisodeList &episodes) {
+
+  QList<Task*> ta;
+  for (Task *tas : list_tasks_) {
+    for (const PodcastEpisode &episode : episodes) {
+      if (tas->episode().database_id() == episode.database_id()) {
+        ta << tas;
+      }
+    }
+  }
+  for (Task *tas : ta) {
+    tas->finishedPublic();
+    list_tasks_.removeAll(tas);
+  }
+
+}

src/podcasts/podcastdownloader.h

@@ -0,0 +1,129 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTDOWNLOADER_H
+#define PODCASTDOWNLOADER_H
+
+#include <memory>
+
+#include <QObject>
+#include <QFile>
+#include <QSet>
+#include <QList>
+#include <QQueue>
+#include <QString>
+#include <QRegularExpression>
+#include <QNetworkRequest>
+
+#include "core/networkaccessmanager.h"
+#include "podcast.h"
+#include "podcastepisode.h"
+
+class Application;
+class PodcastBackend;
+
+class NetworkAccessManager;
+class QNetworkReply;
+
+namespace PodcastDownload {
+enum State {
+  NotDownloading,
+  Queued,
+  Downloading,
+  Finished
+};
+}
+
+class Task : public QObject {
+  Q_OBJECT
+
+ public:
+  Task(const PodcastEpisode &episode, QFile *file, PodcastBackend *backend);
+  PodcastEpisode episode() const;
+
+ signals:
+  void ProgressChanged(const PodcastEpisode &episode, const PodcastDownload::State state, const int percent);
+  void finished(Task *task);
+
+ public slots:
+  void finishedPublic();
+
+ private slots:
+  void reading();
+  void downloadProgressInternal(qint64 received, qint64 total);
+  void finishedInternal();
+
+ private:
+  std::unique_ptr<QFile> file_;
+  PodcastEpisode episode_;
+  PodcastBackend *backend_;
+  std::unique_ptr<NetworkAccessManager> network_;
+  QNetworkRequest req_;
+  QNetworkReply *reply_;
+};
+
+class PodcastDownloader : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit PodcastDownloader(Application *app, QObject *parent = nullptr);
+
+  PodcastEpisodeList EpisodesDownloading(const PodcastEpisodeList &episodes);
+  QString DefaultDownloadDir() const;
+
+ public slots:
+  // Adds the episode to the download queue
+  void DownloadEpisode(const PodcastEpisode &episode);
+  void cancelDownload(const PodcastEpisodeList &episodes);
+
+ signals:
+  void ProgressChanged(const PodcastEpisode &episode, const PodcastDownload::State state, const int percent);
+
+ private slots:
+  void ReloadSettings();
+
+  void SubscriptionAdded(const Podcast &podcast);
+  void EpisodesAdded(const PodcastEpisodeList &episodes);
+
+  void ReplyFinished(Task *task);
+
+ private:
+  QString FilenameForEpisode(const QString &directory, const PodcastEpisode &episode) const;
+  QString SanitiseFilenameComponent(const QString &text) const;
+
+ private:
+  static const char *kSettingsGroup;
+
+  Application *app_;
+  PodcastBackend *backend_;
+  NetworkAccessManager *network_;
+
+  QRegularExpression disallowed_filename_characters_;
+
+  bool auto_download_;
+  QString download_dir_;
+
+  QList<Task*> list_tasks_;
+};
+
+#endif  // PODCASTDOWNLOADER_H

src/podcasts/podcastepisode.cpp

@@ -0,0 +1,231 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <limits>
+
+#include <QSharedData>
+#include <QIODevice>
+#include <QFile>
+#include <QFileInfo>
+#include <QDataStream>
+#include <QVariant>
+#include <QVariantMap>
+#include <QByteArray>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+#include <QDateTime>
+#include <QSqlQuery>
+
+#include "core/logging.h"
+#include "core/timeconstants.h"
+#include "core/utilities.h"
+#include "podcast.h"
+#include "podcastepisode.h"
+
+const QStringList PodcastEpisode::kColumns = QStringList() << "podcast_id"
+                                                           << "title"
+                                                           << "description"
+                                                           << "author"
+                                                           << "publication_date"
+                                                           << "duration_secs"
+                                                           << "url"
+                                                           << "listened"
+                                                           << "listened_date"
+                                                           << "downloaded"
+                                                           << "local_url"
+                                                           << "extra";
+
+const QString PodcastEpisode::kColumnSpec = PodcastEpisode::kColumns.join(", ");
+const QString PodcastEpisode::kJoinSpec = Utilities::Prepend("e.", PodcastEpisode::kColumns).join(", ");
+const QString PodcastEpisode::kBindSpec = Utilities::Prepend(":", PodcastEpisode::kColumns).join(", ");
+const QString PodcastEpisode::kUpdateSpec = Utilities::Updateify(PodcastEpisode::kColumns).join(", ");
+
+struct PodcastEpisode::Private : public QSharedData {
+  Private();
+
+  int database_id_;
+  int podcast_database_id_;
+
+  QString title_;
+  QString description_;
+  QString author_;
+  QDateTime publication_date_;
+  int duration_secs_;
+  QUrl url_;
+
+  bool listened_;
+  QDateTime listened_date_;
+
+  bool downloaded_;
+  QUrl local_url_;
+
+  QVariantMap extra_;
+};
+
+PodcastEpisode::Private::Private()
+    : database_id_(-1),
+      podcast_database_id_(-1),
+      duration_secs_(-1),
+      listened_(false),
+      downloaded_(false) {}
+
+PodcastEpisode::PodcastEpisode() : d(new Private) {}
+
+PodcastEpisode::PodcastEpisode(const PodcastEpisode &other) : d(other.d) {}
+
+PodcastEpisode::~PodcastEpisode() {}
+
+PodcastEpisode &PodcastEpisode::operator=(const PodcastEpisode &other) {
+  d = other.d;
+  return *this;
+}
+
+int PodcastEpisode::database_id() const { return d->database_id_; }
+int PodcastEpisode::podcast_database_id() const {
+  return d->podcast_database_id_;
+}
+const QString &PodcastEpisode::title() const { return d->title_; }
+const QString &PodcastEpisode::description() const { return d->description_; }
+const QString &PodcastEpisode::author() const { return d->author_; }
+const QDateTime &PodcastEpisode::publication_date() const { return d->publication_date_; }
+int PodcastEpisode::duration_secs() const { return d->duration_secs_; }
+const QUrl &PodcastEpisode::url() const { return d->url_; }
+bool PodcastEpisode::listened() const { return d->listened_; }
+const QDateTime &PodcastEpisode::listened_date() const { return d->listened_date_; }
+bool PodcastEpisode::downloaded() const { return d->downloaded_; }
+const QUrl &PodcastEpisode::local_url() const { return d->local_url_; }
+const QVariantMap &PodcastEpisode::extra() const { return d->extra_; }
+QVariant PodcastEpisode::extra(const QString &key) const { return d->extra_[key]; }
+
+void PodcastEpisode::set_database_id(const int v) { d->database_id_ = v; }
+void PodcastEpisode::set_podcast_database_id(const int v) { d->podcast_database_id_ = v; }
+void PodcastEpisode::set_title(const QString &v) { d->title_ = v; }
+void PodcastEpisode::set_description(const QString &v) { d->description_ = v; }
+void PodcastEpisode::set_author(const QString &v) { d->author_ = v; }
+void PodcastEpisode::set_publication_date(const QDateTime &v) { d->publication_date_ = v; }
+void PodcastEpisode::set_duration_secs(int v) { d->duration_secs_ = v; }
+void PodcastEpisode::set_url(const QUrl &v) { d->url_ = v; }
+void PodcastEpisode::set_listened(const bool v) { d->listened_ = v; }
+void PodcastEpisode::set_listened_date(const QDateTime &v) { d->listened_date_ = v; }
+void PodcastEpisode::set_downloaded(const bool v) { d->downloaded_ = v; }
+void PodcastEpisode::set_local_url(const QUrl &v) { d->local_url_ = v; }
+void PodcastEpisode::set_extra(const QVariantMap &v) { d->extra_ = v; }
+void PodcastEpisode::set_extra(const QString &key, const QVariant &value) { d->extra_[key] = value; }
+
+void PodcastEpisode::InitFromQuery(const QSqlQuery &query) {
+
+  d->database_id_ = query.value(0).toInt();
+  d->podcast_database_id_ = query.value(1).toInt();
+  d->title_ = query.value(2).toString();
+  d->description_ = query.value(3).toString();
+  d->author_ = query.value(4).toString();
+  d->publication_date_ = QDateTime::fromSecsSinceEpoch(query.value(5).toUInt());
+  d->duration_secs_ = query.value(6).toInt();
+  d->url_ = QUrl::fromEncoded(query.value(7).toByteArray());
+  d->listened_ = query.value(8).toBool();
+
+  // After setting QDateTime to invalid state, it's saved into database as time_t,
+  // when this number std::numeric_limits<unsigned int>::max() (4294967295) is read back from database, it creates a valid QDateTime.
+  // So to make it behave consistently, this change is needed.
+  if (query.value(9).toUInt() == std::numeric_limits<unsigned int>::max()) {
+    d->listened_date_ = QDateTime();
+  }
+  else {
+    d->listened_date_ = QDateTime::fromSecsSinceEpoch(query.value(9).toUInt());
+  }
+
+  d->downloaded_ = query.value(10).toBool();
+  d->local_url_ = QUrl::fromEncoded(query.value(11).toByteArray());
+
+  QDataStream extra_stream(query.value(12).toByteArray());
+  extra_stream >> d->extra_;
+
+}
+
+void PodcastEpisode::BindToQuery(QSqlQuery* query) const {
+
+  query->bindValue(":podcast_id", d->podcast_database_id_);
+  query->bindValue(":title", d->title_);
+  query->bindValue(":description", d->description_);
+  query->bindValue(":author", d->author_);
+  query->bindValue(":publication_date", d->publication_date_.toSecsSinceEpoch());
+  query->bindValue(":duration_secs", d->duration_secs_);
+  query->bindValue(":url", d->url_.toEncoded());
+  query->bindValue(":listened", d->listened_);
+  query->bindValue(":listened_date", d->listened_date_.toSecsSinceEpoch());
+  query->bindValue(":downloaded", d->downloaded_);
+  query->bindValue(":local_url", d->local_url_.toEncoded());
+
+  QByteArray extra;
+  QDataStream extra_stream(&extra, QIODevice::WriteOnly);
+  extra_stream << d->extra_;
+
+  query->bindValue(":extra", extra);
+
+}
+
+Song PodcastEpisode::ToSong(const Podcast &podcast) const {
+
+  Song ret;
+  ret.set_valid(true);
+  ret.set_title(title().simplified());
+  ret.set_artist(author().simplified());
+  ret.set_length_nanosec(kNsecPerSec * duration_secs());
+  ret.set_year(publication_date().date().year());
+  ret.set_comment(description());
+  ret.set_id(database_id());
+  ret.set_ctime(publication_date().toSecsSinceEpoch());
+  ret.set_genre(QString("Podcast"));
+  //ret.set_genre_id3(186);
+
+  if (listened() && listened_date().isValid()) {
+    ret.set_mtime(listened_date().toSecsSinceEpoch());
+  }
+  else {
+    ret.set_mtime(publication_date().toSecsSinceEpoch());
+  }
+
+  if (ret.length_nanosec() < 0) {
+    ret.set_length_nanosec(-1);
+  }
+
+  if (downloaded() && QFile::exists(local_url().toLocalFile())) {
+    ret.set_url(local_url());
+  }
+  else {
+    ret.set_url(url());
+  }
+
+  ret.set_basefilename(QFileInfo(ret.url().path()).fileName());
+
+  // Use information from the podcast if it's set
+  if (podcast.is_valid()) {
+    ret.set_album(podcast.title().simplified());
+    ret.set_art_automatic(podcast.ImageUrlLarge());
+
+    if (author().isEmpty()) ret.set_artist(podcast.title().simplified());
+  }
+  return ret;
+
+}

src/podcasts/podcastepisode.h

@@ -0,0 +1,100 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTEPISODE_H
+#define PODCASTEPISODE_H
+
+#include <QSharedDataPointer>
+#include <QVariant>
+#include <QVariantMap>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+#include <QDateTime>
+#include <QSqlQuery>
+
+#include "core/song.h"
+
+class Podcast;
+
+class PodcastEpisode {
+ public:
+  PodcastEpisode();
+  PodcastEpisode(const PodcastEpisode &other);
+  ~PodcastEpisode();
+
+  static const QStringList kColumns;
+  static const QString kColumnSpec;
+  static const QString kJoinSpec;
+  static const QString kBindSpec;
+  static const QString kUpdateSpec;
+
+  void InitFromQuery(const QSqlQuery &query);
+  void BindToQuery(QSqlQuery *query) const;
+
+  Song ToSong(const Podcast &podcast) const;
+
+  bool is_valid() const { return database_id() != -1; }
+
+  int database_id() const;
+  int podcast_database_id() const;
+  const QString &title() const;
+  const QString &description() const;
+  const QString &author() const;
+  const QDateTime &publication_date() const;
+  int duration_secs() const;
+  const QUrl &url() const;
+  bool listened() const;
+  const QDateTime &listened_date() const;
+  bool downloaded() const;
+  const QUrl &local_url() const;
+  const QVariantMap &extra() const;
+  QVariant extra(const QString &key) const;
+
+  void set_database_id(const int v);
+  void set_podcast_database_id(int v);
+  void set_title(const QString &v);
+  void set_description(const QString &v);
+  void set_author(const QString &v);
+  void set_publication_date(const QDateTime &v);
+  void set_duration_secs(int v);
+  void set_url(const QUrl &v);
+  void set_listened(const bool v);
+  void set_listened_date(const QDateTime &v);
+  void set_downloaded(const bool v);
+  void set_local_url(const QUrl &v);
+  void set_extra(const QVariantMap &v);
+  void set_extra(const QString &key, const QVariant &value);
+
+  PodcastEpisode &operator=(const PodcastEpisode &other);
+
+ private:
+  struct Private;
+  QSharedDataPointer<Private> d;
+};
+Q_DECLARE_METATYPE(PodcastEpisode)
+
+typedef QList<PodcastEpisode> PodcastEpisodeList;
+Q_DECLARE_METATYPE(QList<PodcastEpisode>)
+
+#endif  // PODCASTEPISODE_H

src/podcasts/podcastinfodialog.cpp

@@ -0,0 +1,59 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+   Copyright 2018, Jim Broadus <jbroadus@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QDialog>
+
+#include "core/application.h"
+#include "podcastepisode.h"
+#include "podcastinfodialog.h"
+#include "ui_podcastinfodialog.h"
+
+PodcastInfoDialog::PodcastInfoDialog(Application *app, QWidget *parent)
+    : QDialog(parent), app_(app), ui_(new Ui_PodcastInfoDialog) {
+
+  ui_->setupUi(this);
+  ui_->podcast_details->SetApplication(app);
+  ui_->episode_details->SetApplication(app);
+
+}
+
+PodcastInfoDialog::~PodcastInfoDialog() { delete ui_; }
+
+void PodcastInfoDialog::ShowPodcast(const Podcast &podcast) {
+
+  ui_->episode_info_scroll_area->hide();
+  ui_->podcast_url->setText(podcast.url().toString());
+  ui_->podcast_url->setReadOnly(true);
+  ui_->podcast_details->SetPodcast(podcast);
+  show();
+
+}
+
+void PodcastInfoDialog::ShowEpisode(const PodcastEpisode &episode, const Podcast &podcast) {
+
+  ui_->episode_info_scroll_area->show();
+  ui_->podcast_url->setText(episode.url().toString());
+  ui_->podcast_url->setReadOnly(true);
+  ui_->podcast_details->SetPodcast(podcast);
+  ui_->episode_details->SetEpisode(episode);
+  show();
+
+}

src/podcasts/podcastinfodialog.h

@@ -0,0 +1,48 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+   Copyright 2018, Jim Broadus <jbroadus@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTINFODIALOG_H
+#define PODCASTINFODIALOG_H
+
+#include <QDialog>
+
+class Application;
+class Podcast;
+class PodcastEpisode;
+class Ui_PodcastInfoDialog;
+
+class PodcastInfoDialog : public QDialog {
+  Q_OBJECT
+
+ public:
+  explicit PodcastInfoDialog(Application *app, QWidget *parent = nullptr);
+  ~PodcastInfoDialog();
+
+  void ShowPodcast(const Podcast &podcast);
+  void ShowEpisode(const PodcastEpisode &episode, const Podcast &podcast);
+
+ private:
+  Application *app_;
+
+  Ui_PodcastInfoDialog *ui_;
+};
+
+#endif  // PODCASTINFODIALOG_H

src/podcasts/podcastinfodialog.ui

@@ -0,0 +1,142 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PodcastInfoDialog</class>
+ <widget class="QDialog" name="PodcastInfoDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>493</width>
+    <height>415</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Podcast Information</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_3">
+   <item>
+    <widget class="QLineEdit" name="podcast_url"/>
+   </item>
+   <item>
+    <widget class="QScrollArea" name="episode_info_scroll_area">
+     <property name="enabled">
+      <bool>true</bool>
+     </property>
+     <property name="minimumSize">
+      <size>
+       <width>250</width>
+       <height>100</height>
+      </size>
+     </property>
+     <property name="horizontalScrollBarPolicy">
+      <enum>Qt::ScrollBarAlwaysOff</enum>
+     </property>
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="EpisodeInfoWidget" name="episode_details">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>473</width>
+        <height>158</height>
+       </rect>
+      </property>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <widget class="QScrollArea" name="podcast_info_scroll_area">
+     <property name="minimumSize">
+      <size>
+       <width>250</width>
+       <height>100</height>
+      </size>
+     </property>
+     <property name="maximumSize">
+      <size>
+       <width>16777215</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="horizontalScrollBarPolicy">
+      <enum>Qt::ScrollBarAlwaysOff</enum>
+     </property>
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="PodcastInfoWidget" name="podcast_details">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>473</width>
+        <height>157</height>
+       </rect>
+      </property>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>PodcastInfoWidget</class>
+   <extends>QWidget</extends>
+   <header>podcasts/podcastinfowidget.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>EpisodeInfoWidget</class>
+   <extends>QWidget</extends>
+   <header location="global">podcasts/episodeinfowidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>PodcastInfoDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>PodcastInfoDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/podcasts/podcastinfowidget.cpp

@@ -0,0 +1,134 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QWidget>
+#include <QImage>
+#include <QPixmap>
+#include <QColor>
+#include <QPalette>
+#include <QLabel>
+
+#include "core/application.h"
+#include "covermanager/albumcoverloader.h"
+#include "covermanager/albumcoverloaderoptions.h"
+#include "covermanager/albumcoverloaderresult.h"
+#include "podcastinfowidget.h"
+#include "ui_podcastinfowidget.h"
+
+PodcastInfoWidget::PodcastInfoWidget(QWidget *parent)
+    : QWidget(parent),
+      ui_(new Ui_PodcastInfoWidget),
+      app_(nullptr),
+      image_id_(0) {
+
+  ui_->setupUi(this);
+
+  cover_options_.desired_height_ = 180;
+  ui_->image->setFixedSize(cover_options_.desired_height_, cover_options_.desired_height_);
+
+  // Set the colour of all the labels
+  const bool light = palette().color(QPalette::Base).value() > 128;
+  const QColor color = palette().color(QPalette::Dark);
+  QPalette label_palette(palette());
+  label_palette.setColor(QPalette::WindowText, light ? color.darker(150) : color.lighter(125));
+
+  for (QLabel* label : findChildren<QLabel*>()) {
+    if (label->property("field_label").toBool()) {
+      label->setPalette(label_palette);
+    }
+  }
+
+}
+
+PodcastInfoWidget::~PodcastInfoWidget() { delete ui_; }
+
+void PodcastInfoWidget::SetApplication(Application *app) {
+
+  app_ = app;
+  connect(app_->album_cover_loader(), &AlbumCoverLoader::AlbumCoverLoaded, this, &PodcastInfoWidget::AlbumCoverLoaded);
+
+}
+
+namespace {
+template<typename T>
+void SetText(const QString& value, T* label, QLabel* buddy_label = nullptr) {
+
+  const bool visible = !value.isEmpty();
+
+  label->setVisible(visible);
+  if (buddy_label) {
+    buddy_label->setVisible(visible);
+  }
+
+  if (visible) {
+    label->setText(value);
+  }
+
+}
+}  // namespace
+
+void PodcastInfoWidget::SetPodcast(const Podcast &podcast) {
+
+  if (image_id_) {
+    app_->album_cover_loader()->CancelTask(image_id_);
+    image_id_ = 0;
+  }
+
+  podcast_ = podcast;
+
+  if (podcast.ImageUrlLarge().isValid()) {
+    // Start loading an image for this item.
+    image_id_ = app_->album_cover_loader()->LoadImageAsync(cover_options_, podcast.ImageUrlLarge(), QUrl());
+  }
+
+  ui_->image->hide();
+
+  SetText(podcast.title(), ui_->title);
+  SetText(podcast.description(), ui_->description);
+  SetText(podcast.copyright(), ui_->copyright, ui_->copyright_label);
+  SetText(podcast.author(), ui_->author, ui_->author_label);
+  SetText(podcast.owner_name(), ui_->owner, ui_->owner_label);
+  SetText(podcast.link().toString(), ui_->website, ui_->website_label);
+  SetText(podcast.extra("gpodder:subscribers").toString(), ui_->subscribers, ui_->subscribers_label);
+
+  if (!image_id_) {
+    emit LoadingFinished();
+  }
+
+}
+
+void PodcastInfoWidget::AlbumCoverLoaded(const quint64 id, const AlbumCoverLoaderResult &result) {
+
+  if (id != image_id_) {
+    return;
+  }
+  image_id_ = 0;
+
+  if (result.success && !result.image_scaled.isNull()) {
+    ui_->image->setPixmap(QPixmap::fromImage(result.image_scaled));
+    ui_->image->show();
+  }
+
+  emit LoadingFinished();
+
+}

src/podcasts/podcastinfowidget.h

@@ -0,0 +1,65 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTINFOWIDGET_H
+#define PODCASTINFOWIDGET_H
+
+#include <QWidget>
+
+#include "podcast.h"
+#include "covermanager/albumcoverloaderoptions.h"
+#include "covermanager/albumcoverloaderresult.h"
+
+class Application;
+class Ui_PodcastInfoWidget;
+
+class QLabel;
+
+class PodcastInfoWidget : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit PodcastInfoWidget(QWidget *parent = nullptr);
+  ~PodcastInfoWidget();
+
+  void SetApplication(Application *app);
+
+  void SetPodcast(const Podcast& podcast);
+
+ signals:
+  void LoadingFinished();
+
+ private slots:
+  void AlbumCoverLoaded(const quint64 id, const AlbumCoverLoaderResult &result);
+
+ private:
+  Ui_PodcastInfoWidget *ui_;
+
+  AlbumCoverLoaderOptions cover_options_;
+
+  Application *app_;
+  Podcast podcast_;
+  quint64 image_id_;
+};
+
+#endif  // PODCASTINFOWIDGET_H

src/podcasts/podcastinfowidget.ui

@@ -0,0 +1,220 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PodcastInfoWidget</class>
+ <widget class="QWidget" name="PodcastInfoWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>398</width>
+    <height>551</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <property name="styleSheet">
+   <string notr="true">#title {
+	font-weight: bold;
+}
+
+#description {
+	font-size: smaller;
+}
+
+QLineEdit {
+  background: transparent;
+}</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="sizeConstraint">
+    <enum>QLayout::SetMinAndMaxSize</enum>
+   </property>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <property name="spacing">
+      <number>0</number>
+     </property>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QLabel" name="image">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_2">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QLabel" name="title">
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="description">
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QGridLayout" name="gridLayout">
+     <property name="sizeConstraint">
+      <enum>QLayout::SetMinAndMaxSize</enum>
+     </property>
+     <item row="4" column="1">
+      <widget class="QLineEdit" name="website">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="0">
+      <widget class="QLabel" name="author_label">
+       <property name="text">
+        <string>Author</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="2" column="1">
+      <widget class="QLineEdit" name="owner">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="0">
+      <widget class="QLabel" name="website_label">
+       <property name="text">
+        <string>Website</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLineEdit" name="copyright">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0">
+      <widget class="QLabel" name="copyright_label">
+       <property name="text">
+        <string>Copyright</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QLineEdit" name="author">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="2" column="0">
+      <widget class="QLabel" name="owner_label">
+       <property name="text">
+        <string>Owner</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="3" column="0">
+      <widget class="QLabel" name="subscribers_label">
+       <property name="text">
+        <string>Subscribers</string>
+       </property>
+       <property name="field_label" stdset="0">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="3" column="1">
+      <widget class="QLineEdit" name="subscribers">
+       <property name="frame">
+        <bool>false</bool>
+       </property>
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>0</width>
+       <height>0</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

src/podcasts/podcastparser.cpp

@@ -0,0 +1,376 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QByteArray>
+#include <QString>
+#include <QUrl>
+#include <QDateTime>
+#include <QXmlStreamReader>
+#include <QRegularExpression>
+
+#include "core/logging.h"
+#include "core/utilities.h"
+#include "podcastparser.h"
+#include "opmlcontainer.h"
+
+// Namespace constants must be lower case.
+const char *PodcastParser::kAtomNamespace = "http://www.w3.org/2005/atom";
+const char *PodcastParser::kItunesNamespace = "http://www.itunes.com/dtds/podcast-1.0.dtd";
+
+PodcastParser::PodcastParser() {
+  supported_mime_types_ << "application/rss+xml"
+                        << "application/xml"
+                        << "text/x-opml"
+                        << "text/xml";
+}
+
+bool PodcastParser::SupportsContentType(const QString &content_type) const {
+
+  if (content_type.isEmpty()) {
+    // Why not have a go.
+    return true;
+  }
+
+  for (const QString &mime_type : supported_mime_types()) {
+    if (content_type.contains(mime_type)) {
+      return true;
+    }
+  }
+  return false;
+
+}
+
+bool PodcastParser::TryMagic(const QByteArray &data) const {
+  QString str(QString::fromUtf8(data));
+  return str.contains(QRegularExpression("<rss\\b")) || str.contains(QRegularExpression("<opml\\b"));
+}
+
+QVariant PodcastParser::Load(QIODevice *device, const QUrl &url) const {
+
+  QXmlStreamReader reader(device);
+
+  while (!reader.atEnd()) {
+    switch (reader.readNext()) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader.name().toString();
+        if (name == "rss") {
+          Podcast podcast;
+          if (!ParseRss(&reader, &podcast)) {
+            return QVariant();
+          }
+          else {
+            podcast.set_url(url);
+            return QVariant::fromValue(podcast);
+          }
+        }
+        else if (name == "opml") {
+          OpmlContainer container;
+          if (!ParseOpml(&reader, &container)) {
+            return QVariant();
+          }
+          else {
+            container.url = url;
+            return QVariant::fromValue(container);
+          }
+        }
+
+        return QVariant();
+      }
+
+      default:
+        break;
+    }
+  }
+
+  return QVariant();
+
+}
+
+bool PodcastParser::ParseRss(QXmlStreamReader *reader, Podcast *ret) const {
+
+  if (!Utilities::ParseUntilElement(reader, "channel")) {
+    return false;
+  }
+
+  ParseChannel(reader, ret);
+  return true;
+
+}
+
+void PodcastParser::ParseChannel(QXmlStreamReader *reader, Podcast *ret) const {
+
+  while (!reader->atEnd()) {
+    QXmlStreamReader::TokenType type = reader->readNext();
+    switch (type) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader->name().toString();
+        const QString lower_namespace = reader->namespaceUri().toString().toLower();
+
+        if (name == "title") {
+          ret->set_title(reader->readElementText());
+        }
+        else if (name == "link" && lower_namespace.isEmpty()) {
+          ret->set_link(QUrl::fromEncoded(reader->readElementText().toLatin1()));
+        }
+        else if (name == "description") {
+          ret->set_description(reader->readElementText());
+        }
+        else if (name == "owner" && lower_namespace == kItunesNamespace) {
+          ParseItunesOwner(reader, ret);
+        }
+        else if (name == "image") {
+          ParseImage(reader, ret);
+        }
+        else if (name == "copyright") {
+          ret->set_copyright(reader->readElementText());
+        }
+        else if (name == "link" && lower_namespace == kAtomNamespace && ret->url().isEmpty() && reader->attributes().value("rel").toString() == "self") {
+          ret->set_url(QUrl::fromEncoded(reader->readElementText().toLatin1()));
+        }
+        else if (name == "item") {
+          ParseItem(reader, ret);
+        }
+        else {
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        break;
+      }
+
+      case QXmlStreamReader::EndElement:
+        return;
+
+      default:
+        break;
+    }
+  }
+
+}
+
+void PodcastParser::ParseImage(QXmlStreamReader *reader, Podcast *ret) const {
+
+  while (!reader->atEnd()) {
+    QXmlStreamReader::TokenType type = reader->readNext();
+    switch (type) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader->name().toString();
+        if (name == "url") {
+          ret->set_image_url_large(
+            QUrl::fromEncoded(reader->readElementText().toLatin1()));
+        }
+        else {
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        break;
+      }
+
+      case QXmlStreamReader::EndElement:
+        return;
+
+      default:
+        break;
+    }
+  }
+
+}
+
+void PodcastParser::ParseItunesOwner(QXmlStreamReader *reader, Podcast *ret) const {
+
+  while (!reader->atEnd()) {
+    QXmlStreamReader::TokenType type = reader->readNext();
+    switch (type) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader->name().toString();
+        if (name == "name") {
+          ret->set_owner_name(reader->readElementText());
+        }
+        else if (name == "email") {
+          ret->set_owner_email(reader->readElementText());
+        }
+        else {
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        break;
+      }
+
+      case QXmlStreamReader::EndElement:
+        return;
+
+      default:
+        break;
+    }
+  }
+
+}
+
+void PodcastParser::ParseItem(QXmlStreamReader *reader, Podcast *ret) const {
+
+  PodcastEpisode episode;
+
+  while (!reader->atEnd()) {
+    QXmlStreamReader::TokenType type = reader->readNext();
+    switch (type) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader->name().toString();
+        const QString lower_namespace = reader->namespaceUri().toString().toLower();
+
+        if (name == "title") {
+          episode.set_title(reader->readElementText());
+        }
+        else if (name == "description") {
+          episode.set_description(reader->readElementText());
+        }
+        else if (name == "pubDate") {
+          QString date = reader->readElementText();
+          episode.set_publication_date(Utilities::ParseRFC822DateTime(date));
+          if (!episode.publication_date().isValid()) {
+            qLog(Error) << "Unable to parse date:" << date;
+          }
+        }
+        else if (name == "duration" && lower_namespace == kItunesNamespace) {
+          // http://www.apple.com/itunes/podcasts/specs.html
+          QStringList parts = reader->readElementText().split(':');
+          if (parts.count() == 2) {
+            episode.set_duration_secs(parts[0].toInt() * 60 + parts[1].toInt());
+          }
+          else if (parts.count() >= 3) {
+            episode.set_duration_secs(parts[0].toInt() * 60 * 60 + parts[1].toInt() * 60 + parts[2].toInt());
+          }
+        }
+        else if (name == "enclosure") {
+          const QString type2 = reader->attributes().value("type").toString();
+          const QUrl url = QUrl::fromEncoded(reader->attributes().value("url").toString().toLatin1());
+          if (type2.startsWith("audio/") || type2.startsWith("x-audio/")) {
+            episode.set_url(url);
+          }
+          // If the URL doesn't have a type, see if it's one of the obvious types
+          else if (type2.isEmpty() && (url.path().endsWith(".mp3", Qt::CaseInsensitive) || url.path().endsWith(".m4a", Qt::CaseInsensitive) || url.path().endsWith(".wav", Qt::CaseInsensitive))) {
+            episode.set_url(url);
+          }
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        else if (name == "author" && lower_namespace == kItunesNamespace) {
+          episode.set_author(reader->readElementText());
+        }
+        else {
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        break;
+      }
+
+      case QXmlStreamReader::EndElement:
+        if (!episode.publication_date().isValid()) {
+          episode.set_publication_date(QDateTime::currentDateTime());
+        }
+        if (!episode.url().isEmpty()) {
+          ret->add_episode(episode);
+        }
+        return;
+
+      default:
+        break;
+    }
+  }
+
+}
+
+bool PodcastParser::ParseOpml(QXmlStreamReader *reader, OpmlContainer *ret) const {
+
+  if (!Utilities::ParseUntilElement(reader, "body")) {
+    return false;
+  }
+
+  ParseOutline(reader, ret);
+
+  // OPML files sometimes consist of a single top level container.
+  OpmlContainer *top = ret;
+  while (top->feeds.count() == 0 && top->containers.count() == 1) {
+    top = &top->containers[0];
+  }
+  if (top != ret) {
+    // Copy the sub-container to a temporary location first.
+    OpmlContainer tmp = *top;
+    *ret = tmp;
+  }
+
+  return true;
+
+}
+
+void PodcastParser::ParseOutline(QXmlStreamReader *reader, OpmlContainer *ret) const {
+
+  while (!reader->atEnd()) {
+    QXmlStreamReader::TokenType type = reader->readNext();
+    switch (type) {
+      case QXmlStreamReader::StartElement: {
+        const QString name = reader->name().toString();
+        if (name != "outline") {
+          Utilities::ConsumeCurrentElement(reader);
+          continue;
+        }
+
+        QXmlStreamAttributes attributes = reader->attributes();
+
+        if (attributes.value("type").toString() == "rss") {
+          // Parse the feed and add it to this container
+          Podcast podcast;
+          podcast.set_description(attributes.value("description").toString());
+
+          QString title = attributes.value("title").toString();
+          if (title.isEmpty()) {
+            title = attributes.value("text").toString();
+          }
+          podcast.set_title(title);
+          podcast.set_image_url_large(QUrl::fromEncoded(attributes.value("imageHref").toString().toLatin1()));
+          podcast.set_url(QUrl::fromEncoded(attributes.value("xmlUrl").toString().toLatin1()));
+          ret->feeds.append(podcast);
+
+          // Consume any children and the EndElement.
+          Utilities::ConsumeCurrentElement(reader);
+        }
+        else {
+          // Create a new child container
+          OpmlContainer child;
+
+          // Take the name from the fullname attribute first if it exists.
+          child.name = attributes.value("fullname").toString();
+          if (child.name.isEmpty()) {
+            child.name = attributes.value("text").toString();
+          }
+
+          // Parse its contents and add it to this container
+          ParseOutline(reader, &child);
+          ret->containers.append(child);
+        }
+
+        break;
+      }
+
+      case QXmlStreamReader::EndElement:
+        return;
+
+      default:
+        break;
+    }
+  }
+
+}

src/podcasts/podcastparser.h

@@ -0,0 +1,72 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTPARSER_H
+#define PODCASTPARSER_H
+
+#include <QByteArray>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+
+#include "podcast.h"
+
+class QIODevice;
+class QXmlStreamReader;
+
+class OpmlContainer;
+
+// Reads XML data from a QIODevice.
+// Returns either a Podcast or an OpmlContainer depending on what was inside the XML document.
+class PodcastParser {
+ public:
+  PodcastParser();
+
+  static const char *kAtomNamespace;
+  static const char *kItunesNamespace;
+
+  const QStringList &supported_mime_types() const { return supported_mime_types_; }
+  bool SupportsContentType(const QString &content_type) const;
+
+  // You should check the type of the returned QVariant to see whether it contains a Podcast or an OpmlContainer.
+  // If the QVariant isNull then an error occurred parsing the XML.
+  QVariant Load(QIODevice *device, const QUrl &url) const;
+
+  // Really quick test to see if some data might be supported.  Load() might still return a null QVariant.
+  bool TryMagic(const QByteArray &data) const;
+
+ private:
+  bool ParseRss(QXmlStreamReader *reader, Podcast *ret) const;
+  void ParseChannel(QXmlStreamReader *reader, Podcast *ret) const;
+  void ParseImage(QXmlStreamReader *reader, Podcast *ret) const;
+  void ParseItunesOwner(QXmlStreamReader *reader, Podcast *ret) const;
+  void ParseItem(QXmlStreamReader *reader, Podcast *ret) const;
+
+  bool ParseOpml(QXmlStreamReader *reader, OpmlContainer *ret) const;
+  void ParseOutline(QXmlStreamReader *reader, OpmlContainer *ret) const;
+
+ private:
+  QStringList supported_mime_types_;
+};
+
+#endif  // PODCASTPARSER_H

src/podcasts/podcastservice.cpp

@@ -0,0 +1,919 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012-2013, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2013-2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2014, Simeon Bird <sbird@andrew.cmu.edu>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <memory>
+
+#include "podcastservice.h"
+
+#include <QObject>
+#include <QtConcurrentRun>
+#include <QSet>
+#include <QMap>
+#include <QVariant>
+#include <QString>
+#include <QIcon>
+#include <QDateTime>
+#include <QFont>
+#include <QStandardItemModel>
+#include <QStandardItem>
+#include <QSortFilterProxyModel>
+#include <QMenu>
+#include <QAction>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/mergedproxymodel.h"
+#include "core/iconloader.h"
+#include "core/standarditemiconloader.h"
+//#include "podcastsmodel.h"
+#include "podcastservicemodel.h"
+#include "collection/collectionview.h"
+#include "opmlcontainer.h"
+#include "podcastbackend.h"
+#include "podcastdeleter.h"
+#include "podcastdownloader.h"
+#include "podcastinfodialog.h"
+#include "podcastupdater.h"
+#include "addpodcastdialog.h"
+#include "organize/organizedialog.h"
+#include "organize/organizeerrordialog.h"
+#include "playlist/playlistmanager.h"
+#include "device/devicemanager.h"
+#include "device/devicestatefiltermodel.h"
+#include "device/deviceview.h"
+
+const char* PodcastService::kServiceName = "Podcasts";
+const char *PodcastService::kSettingsGroup = "Podcasts";
+
+class PodcastSortProxyModel : public QSortFilterProxyModel {
+ public:
+  explicit PodcastSortProxyModel(QObject *parent = nullptr);
+
+ protected:
+  bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
+};
+
+PodcastService::PodcastService(Application *app, QObject *parent)
+    : InternetService(Song::Source_Unknown, kServiceName, QString(), QString(), SettingsDialog::Page_Appearance, app, parent),
+      use_pretty_covers_(true),
+      hide_listened_(false),
+      show_episodes_(0),
+      icon_loader_(new StandardItemIconLoader(app->album_cover_loader(), this)),
+      backend_(app->podcast_backend()),
+      model_(new PodcastServiceModel(this)),
+      proxy_(new PodcastSortProxyModel(this)),
+      root_(nullptr),
+      organize_dialog_(new OrganizeDialog(app_->task_manager())) {
+
+  icon_loader_->SetModel(model_);
+  proxy_->setSourceModel(model_);
+  proxy_->setDynamicSortFilter(true);
+  proxy_->sort(0);
+
+  QObject::connect(backend_, &PodcastBackend::SubscriptionAdded, this, &PodcastService::SubscriptionAdded);
+  QObject::connect(backend_, &PodcastBackend::SubscriptionRemoved, this, &PodcastService::SubscriptionRemoved);
+  QObject::connect(backend_, &PodcastBackend::EpisodesAdded, this, &PodcastService::EpisodesAdded);
+  QObject::connect(backend_, &PodcastBackend::EpisodesUpdated, this, &PodcastService::EpisodesUpdated);
+
+  QObject::connect(app_->playlist_manager(), &PlaylistManager::CurrentSongChanged, this, &PodcastService::CurrentSongChanged);
+  QObject::connect(organize_dialog_.get(), &OrganizeDialog::FileCopied, this, &PodcastService::FileCopied);
+
+}
+
+PodcastService::~PodcastService() {}
+
+PodcastSortProxyModel::PodcastSortProxyModel(QObject *parent) : QSortFilterProxyModel(parent) {}
+
+bool PodcastSortProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const {
+
+  Q_UNUSED(left)
+  Q_UNUSED(right)
+
+#if 0
+  const int left_type = left.data(InternetModel::Role_Type).toInt();
+  const int right_type = right.data(InternetModel::Role_Type).toInt();
+
+  // The special Add Podcast item comes first
+  if (left_type == PodcastService::Type_AddPodcast)
+    return true;
+  else if (right_type == PodcastService::Type_AddPodcast)
+    return false;
+
+  // Otherwise we only compare identical typed items.
+  if (left_type != right_type)
+    return QSortFilterProxyModel::lessThan(left, right);
+
+  switch (left_type) {
+    case PodcastService::Type_Podcast:
+      return left.data().toString().localeAwareCompare(right.data().toString()) < 0;
+
+    case PodcastService::Type_Episode: {
+      const PodcastEpisode left_episode = left.data(PodcastService::Role_Episode).value<PodcastEpisode>();
+      const PodcastEpisode right_episode = right.data(PodcastService::Role_Episode).value<PodcastEpisode>();
+
+      return left_episode.publication_date() > right_episode.publication_date();
+    }
+
+    default:
+      return QSortFilterProxyModel::lessThan(left, right);
+  }
+#endif
+  return false;
+
+}
+
+QStandardItem *PodcastService::CreateRootItem() {
+
+#if 0
+  root_ = new QStandardItem(IconLoader::Load("podcast"), tr("Podcasts"));
+  root_->setData(true, InternetModel::Role_CanLazyLoad);
+  return root_;
+#endif
+  return nullptr;
+
+}
+
+void PodcastService::CopyToDevice() {
+
+  if (selected_episodes_.isEmpty() && explicitly_selected_podcasts_.isEmpty()) {
+    CopyToDevice(backend_->GetNewDownloadedEpisodes());
+  }
+  else {
+    CopyToDevice(selected_episodes_, explicitly_selected_podcasts_);
+  }
+
+}
+
+void PodcastService::CopyToDevice(const PodcastEpisodeList &episodes_list) {
+
+  SongList songs;
+  Podcast podcast;
+  for (const PodcastEpisode &episode : episodes_list) {
+    podcast = backend_->GetSubscriptionById(episode.podcast_database_id());
+    songs.append(episode.ToSong(podcast));
+  }
+
+  if (songs.isEmpty()) return;
+
+  organize_dialog_->SetDestinationModel(app_->device_manager()->connected_devices_model(), true);
+  organize_dialog_->SetCopy(true);
+  if (organize_dialog_->SetSongs(songs)) organize_dialog_->show();
+
+
+}
+
+void PodcastService::CopyToDevice(const QModelIndexList &episode_indexes, const QModelIndexList &podcast_indexes) {
+
+  PodcastEpisodeList episodes;
+  for (const QModelIndex &idx : episode_indexes) {
+    PodcastEpisode episode_tmp = idx.data(Role_Episode).value<PodcastEpisode>();
+    if (episode_tmp.downloaded()) episodes << episode_tmp;
+  }
+
+  for (const QModelIndex &idx : podcast_indexes) {
+    for (int i = 0; i < idx.model()->rowCount(idx); ++i) {
+      const QModelIndex &idx2 = idx.model()->index(i, 0, idx);
+      PodcastEpisode episode_tmp = idx2.data(Role_Episode).value<PodcastEpisode>();
+      if (episode_tmp.downloaded() && !episode_tmp.listened())
+        episodes << episode_tmp;
+    }
+  }
+  SongList songs;
+  for (const PodcastEpisode &episode : episodes) {
+    Podcast podcast = backend_->GetSubscriptionById(episode.podcast_database_id());
+    songs.append(episode.ToSong(podcast));
+  }
+
+  organize_dialog_->SetDestinationModel(app_->device_manager()->connected_devices_model(), true);
+  organize_dialog_->SetCopy(true);
+  if (organize_dialog_->SetSongs(songs)) organize_dialog_->show();
+
+}
+
+void PodcastService::CancelDownload() {
+  CancelDownload(selected_episodes_, explicitly_selected_podcasts_);
+}
+
+void PodcastService::CancelDownload(const QModelIndexList &episode_indexes, const QModelIndexList &podcast_indexes) {
+
+  PodcastEpisodeList episodes;
+  for (const QModelIndex &idx : episode_indexes) {
+    if (!idx.isValid()) continue;
+    PodcastEpisode episode_tmp = idx.data(Role_Episode).value<PodcastEpisode>();
+    episodes << episode_tmp;
+  }
+
+  for (const QModelIndex &idx : podcast_indexes) {
+    if (!idx.isValid()) continue;
+    for (int i = 0; i < idx.model()->rowCount(idx); ++i) {
+      const QModelIndex &idx2 = idx.model()->index(i, 0, idx);
+      if (!idx2.isValid()) continue;
+      PodcastEpisode episode_tmp = idx2.data(Role_Episode).value<PodcastEpisode>();
+      episodes << episode_tmp;
+    }
+  }
+  episodes = app_->podcast_downloader()->EpisodesDownloading(episodes);
+  app_->podcast_downloader()->cancelDownload(episodes);
+
+}
+
+void PodcastService::LazyPopulate(QStandardItem *parent) {
+
+  Q_UNUSED(parent)
+#if 0
+  switch (parent->data(InternetModel::Role_Type).toInt()) {
+    case InternetModel::Type_Service:
+      PopulatePodcastList(model_->invisibleRootItem());
+      model()->merged_model()->AddSubModel(parent->index(), proxy_);
+      break;
+  }
+#endif
+
+}
+
+void PodcastService::PopulatePodcastList(QStandardItem *parent) {
+
+  // Do this here since the downloader won't be created yet in the ctor.
+  QObject::connect(app_->podcast_downloader(), &PodcastDownloader::ProgressChanged, this, &PodcastService::DownloadProgressChanged);
+
+  if (default_icon_.isNull()) {
+    default_icon_ = IconLoader::Load("podcast");
+  }
+
+  PodcastList podcasts = backend_->GetAllSubscriptions();
+  for (const Podcast &podcast : podcasts) {
+    parent->appendRow(CreatePodcastItem(podcast));
+  }
+
+}
+
+void PodcastService::ClearPodcastList(QStandardItem *parent) {
+  parent->removeRows(0, parent->rowCount());
+}
+
+void PodcastService::UpdatePodcastText(QStandardItem *item, const int unlistened_count) const {
+
+  const Podcast podcast = item->data(Role_Podcast).value<Podcast>();
+
+  QString title = podcast.title().simplified();
+  QFont font;
+
+  if (unlistened_count > 0) {
+    // Add the number of new episodes after the title.
+    title.append(QString(" (%1)").arg(unlistened_count));
+
+    // Set a bold font
+    font.setBold(true);
+  }
+
+  item->setFont(font);
+  item->setText(title);
+
+}
+
+void PodcastService::UpdateEpisodeText(QStandardItem *item, const PodcastDownload::State state, const int percent) {
+
+  const PodcastEpisode episode = item->data(Role_Episode).value<PodcastEpisode>();
+
+  QString title = episode.title().simplified();
+  QString tooltip;
+  QFont font;
+  QIcon icon;
+
+  // Unlistened episodes are bold
+  if (!episode.listened()) {
+    font.setBold(true);
+  }
+
+  // Downloaded episodes get an icon
+  if (episode.downloaded()) {
+    if (downloaded_icon_.isNull()) {
+      downloaded_icon_ = IconLoader::Load("document-save");
+    }
+    icon = downloaded_icon_;
+  }
+
+  // Queued or downloading episodes get icons, tooltips, and maybe a title.
+  switch (state) {
+    case PodcastDownload::Queued:
+      if (queued_icon_.isNull()) {
+        queued_icon_ = IconLoader::Load("user-away");
+      }
+      icon = queued_icon_;
+      tooltip = tr("Download queued");
+      break;
+
+    case PodcastDownload::Downloading:
+      if (downloading_icon_.isNull()) {
+        downloading_icon_ = IconLoader::Load("go-down");
+      }
+      icon = downloading_icon_;
+      tooltip = tr("Downloading (%1%)...").arg(percent);
+      title = QString("[ %1% ] %2").arg(QString::number(percent), episode.title());
+      break;
+
+    case PodcastDownload::Finished:
+    case PodcastDownload::NotDownloading:
+      break;
+  }
+
+  item->setFont(font);
+  item->setText(title);
+  item->setIcon(icon);
+
+}
+
+void PodcastService::UpdatePodcastText(QStandardItem *item, const PodcastDownload::State state, const int percent) {
+
+  const Podcast podcast = item->data(Role_Podcast).value<Podcast>();
+
+  QString tooltip;
+  QIcon icon;
+
+  // Queued or downloading podcasts get icons, tooltips, and maybe a title.
+  switch (state) {
+    case PodcastDownload::Queued:
+      if (queued_icon_.isNull()) {
+        queued_icon_ = IconLoader::Load("user-away");
+      }
+      icon = queued_icon_;
+      item->setIcon(icon);
+      tooltip = tr("Download queued");
+      break;
+
+    case PodcastDownload::Downloading:
+      if (downloading_icon_.isNull()) {
+        downloading_icon_ = IconLoader::Load("go-down");
+      }
+      icon = downloading_icon_;
+      item->setIcon(icon);
+      tooltip = tr("Downloading (%1%)...").arg(percent);
+      break;
+
+    case PodcastDownload::Finished:
+    case PodcastDownload::NotDownloading:
+      if (podcast.ImageUrlSmall().isValid()) {
+        icon_loader_->LoadIcon(podcast.ImageUrlSmall(), QUrl(), item);
+      }
+      else {
+        item->setIcon(default_icon_);
+      }
+      break;
+  }
+
+}
+
+QStandardItem *PodcastService::CreatePodcastItem(const Podcast &podcast) {
+
+  QStandardItem *item = new QStandardItem;
+
+  // Add the episodes in this podcast and gather aggregate stats.
+  int unlistened_count = 0;
+  qint64 number = 0;
+  for (const PodcastEpisode &episode :
+    backend_->GetEpisodes(podcast.database_id())) {
+    if (!episode.listened()) {
+      unlistened_count++;
+    }
+
+    if (episode.listened() && hide_listened_) {
+      continue;
+    }
+    else {
+      item->appendRow(CreatePodcastEpisodeItem(episode));
+      ++number;
+    }
+
+    if ((number >= show_episodes_) && (show_episodes_ != 0)) {
+      break;
+    }
+  }
+
+  item->setIcon(default_icon_);
+  //item->setData(Type_Podcast, InternetModel::Role_Type);
+  item->setData(QVariant::fromValue(podcast), Role_Podcast);
+  item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsDragEnabled | Qt::ItemIsSelectable);
+  UpdatePodcastText(item, unlistened_count);
+
+  // Load the podcast's image if it has one
+  if (podcast.ImageUrlSmall().isValid()) {
+    icon_loader_->LoadIcon(podcast.ImageUrlSmall(), QUrl(), item);
+  }
+
+  podcasts_by_database_id_[podcast.database_id()] = item;
+
+  return item;
+
+}
+
+QStandardItem *PodcastService::CreatePodcastEpisodeItem(const PodcastEpisode &episode) {
+
+  QStandardItem *item = new QStandardItem;
+  item->setText(episode.title().simplified());
+  //item->setData(Type_Episode, InternetModel::Role_Type);
+  item->setData(QVariant::fromValue(episode), Role_Episode);
+  //item->setData(InternetModel::PlayBehaviour_UseSongLoader, InternetModel::Role_PlayBehaviour);
+  item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsDragEnabled | Qt::ItemIsSelectable);
+
+  UpdateEpisodeText(item);
+
+  episodes_by_database_id_[episode.database_id()] = item;
+
+  return item;
+
+}
+
+void PodcastService::ShowContextMenu(const QPoint &global_pos) {
+
+  if (!context_menu_) {
+    context_menu_ = new QMenu;
+    context_menu_->addAction(IconLoader::Load("list-add"), tr("Add podcast..."), this, &PodcastService::AddPodcast);
+    context_menu_->addAction(IconLoader::Load("view-refresh"), tr("Update all podcasts"), app_->podcast_updater(), &PodcastUpdater::UpdateAllPodcastsNow);
+
+    context_menu_->addSeparator();
+    //context_menu_->addActions(GetPlaylistActions());
+
+    context_menu_->addSeparator();
+    update_selected_action_ = context_menu_->addAction(IconLoader::Load("view-refresh"), tr("Update this podcast"), this, &PodcastService::UpdateSelectedPodcast);
+    download_selected_action_ = context_menu_->addAction(IconLoader::Load("download"), "", this, &PodcastService::DownloadSelectedEpisode);
+    info_selected_action_ = context_menu_->addAction(IconLoader::Load("about-info"), tr("Podcast information"), this, &PodcastService::PodcastInfo);
+    delete_downloaded_action_ = context_menu_->addAction(IconLoader::Load("edit-delete"), tr("Delete downloaded data"), this, &PodcastService::DeleteDownloadedData);
+    copy_to_device_ = context_menu_->addAction(IconLoader::Load("multimedia-player-ipod-mini-blue"), tr("Copy to device..."), this, QOverload<>::of(&PodcastService::CopyToDevice));
+    cancel_download_ = context_menu_->addAction(IconLoader::Load("cancel"), tr("Cancel download"), this, QOverload<>::of(&PodcastService::CancelDownload));
+    remove_selected_action_ = context_menu_->addAction(IconLoader::Load("list-remove"), tr("Unsubscribe"), this, QOverload<>::of(&PodcastService::RemoveSelectedPodcast));
+
+    context_menu_->addSeparator();
+    set_new_action_ = context_menu_->addAction(tr("Mark as new"), this, &PodcastService::SetNew);
+    set_listened_action_ = context_menu_->addAction(tr("Mark as listened"), this, QOverload<>::of(&PodcastService::SetListened));
+
+    context_menu_->addSeparator();
+    context_menu_->addAction(IconLoader::Load("configure"), tr("Configure podcasts..."), this, &PodcastService::ShowConfig);
+
+    copy_to_device_->setDisabled(app_->device_manager()->connected_devices_model()->rowCount() == 0);
+    connect(app_->device_manager()->connected_devices_model(), &DeviceStateFilterModel::IsEmptyChanged, copy_to_device_, &QAction::setDisabled);
+  }
+
+  selected_episodes_.clear();
+  selected_podcasts_.clear();
+  explicitly_selected_podcasts_.clear();
+  QSet<int> podcast_ids;
+#if 0
+  for (const QModelIndex &index : model()->selected_indexes()) {
+    switch (index.data(InternetModel::Role_Type).toInt()) {
+      case Type_Podcast: {
+        const int id = index.data(Role_Podcast).value<Podcast>().database_id();
+        if (!podcast_ids.contains(id)) {
+          selected_podcasts_.append(index);
+          explicitly_selected_podcasts_.append(index);
+          podcast_ids.insert(id);
+        }
+        break;
+      }
+
+      case Type_Episode: {
+        selected_episodes_.append(index);
+
+        // Add the parent podcast as well.
+        const QModelIndex parent = index.parent();
+        const int id = parent.data(Role_Podcast).value<Podcast>().database_id();
+        if (!podcast_ids.contains(id)) {
+          selected_podcasts_.append(parent);
+          podcast_ids.insert(id);
+        }
+        break;
+      }
+    }
+  }
+#endif
+
+  const bool episodes = !selected_episodes_.isEmpty();
+  const bool podcasts = !selected_podcasts_.isEmpty();
+
+  update_selected_action_->setEnabled(podcasts);
+  remove_selected_action_->setEnabled(podcasts);
+  set_new_action_->setEnabled(episodes || podcasts);
+  set_listened_action_->setEnabled(episodes || podcasts);
+  cancel_download_->setEnabled(episodes || podcasts);
+
+  if (selected_episodes_.count() == 1) {
+    const PodcastEpisode episode = selected_episodes_[0].data(Role_Episode).value<PodcastEpisode>();
+    const bool downloaded = episode.downloaded();
+    const bool listened = episode.listened();
+
+    download_selected_action_->setEnabled(!downloaded);
+    delete_downloaded_action_->setEnabled(downloaded);
+
+    if (explicitly_selected_podcasts_.isEmpty()) {
+      set_new_action_->setEnabled(listened);
+      set_listened_action_->setEnabled(!listened || !episode.listened_date().isValid());
+    }
+  }
+  else {
+    download_selected_action_->setEnabled(episodes);
+    delete_downloaded_action_->setEnabled(episodes);
+  }
+
+  if (selected_podcasts_.count() == 1) {
+    if (selected_episodes_.count() == 1) {
+      info_selected_action_->setText(tr("Episode information"));
+      info_selected_action_->setEnabled(true);
+    }
+    else {
+      info_selected_action_->setText(tr("Podcast information"));
+      info_selected_action_->setEnabled(true);
+    }
+  }
+  else {
+    info_selected_action_->setText(tr("Podcast information"));
+    info_selected_action_->setEnabled(false);
+  }
+
+  if (explicitly_selected_podcasts_.isEmpty() && selected_episodes_.isEmpty()) {
+    PodcastEpisodeList epis = backend_->GetNewDownloadedEpisodes();
+    set_listened_action_->setEnabled(!epis.isEmpty());
+  }
+
+  if (selected_episodes_.count() > 1) {
+    download_selected_action_->setText(
+      tr("Download %n episodes", "", selected_episodes_.count()));
+  }
+  else {
+    download_selected_action_->setText(tr("Download this episode"));
+  }
+
+  //GetAppendToPlaylistAction()->setEnabled(episodes || podcasts);
+  //GetReplacePlaylistAction()->setEnabled(episodes || podcasts);
+  //GetOpenInNewPlaylistAction()->setEnabled(episodes || podcasts);
+
+  context_menu_->popup(global_pos);
+
+}
+
+void PodcastService::UpdateSelectedPodcast() {
+
+  for (const QModelIndex &index : selected_podcasts_) {
+    app_->podcast_updater()->UpdatePodcastNow(
+      index.data(Role_Podcast).value<Podcast>());
+  }
+
+}
+
+void PodcastService::RemoveSelectedPodcast() {
+
+  for (const QModelIndex &index : selected_podcasts_) {
+    backend_->Unsubscribe(index.data(Role_Podcast).value<Podcast>());
+  }
+
+}
+
+void PodcastService::ReloadSettings() {
+
+  InitialLoadSettings();
+  ClearPodcastList(model_->invisibleRootItem());
+  PopulatePodcastList(model_->invisibleRootItem());
+
+}
+
+void PodcastService::InitialLoadSettings() {
+
+  QSettings s;
+
+  s.beginGroup(CollectionSettingsPage::kSettingsGroup);
+  use_pretty_covers_ = s.value("pretty_covers", true).toBool();
+  s.endGroup();
+
+  s.beginGroup(kSettingsGroup);
+  hide_listened_ = s.value("hide_listened", false).toBool();
+  show_episodes_ = s.value("show_episodes", 0).toInt();
+  s.endGroup();
+
+  // TODO(notme): reload the podcast icons that are already loaded?
+
+}
+
+void PodcastService::EnsureAddPodcastDialogCreated() {
+  add_podcast_dialog_.reset(new AddPodcastDialog(app_));
+}
+
+void PodcastService::AddPodcast() {
+
+  EnsureAddPodcastDialogCreated();
+  add_podcast_dialog_->show();
+
+}
+
+void PodcastService::FileCopied(int database_id) {
+  SetListened(PodcastEpisodeList() << backend_->GetEpisodeById(database_id), true);
+}
+
+void PodcastService::SubscriptionAdded(const Podcast &podcast) {
+
+  // Ensure the root item is lazy loaded already
+  LazyLoadRoot();
+
+  // The podcast might already be in the list - maybe the LazyLoadRoot() above
+  // added it.
+  QStandardItem *item = podcasts_by_database_id_[podcast.database_id()];
+  if (!item) {
+    item = CreatePodcastItem(podcast);
+    model_->appendRow(item);
+  }
+
+  //emit ScrollToIndex(MapToMergedModel(item->index()));
+
+}
+
+void PodcastService::SubscriptionRemoved(const Podcast &podcast) {
+
+  QStandardItem *item = podcasts_by_database_id_.take(podcast.database_id());
+  if (item) {
+    // Remove any episode ID -> item mappings for the episodes in this podcast.
+    for (int i = 0; i < item->rowCount(); ++i) {
+      QStandardItem *episode_item = item->child(i);
+      const int episode_id = episode_item->data(Role_Episode).value<PodcastEpisode>().database_id();
+
+      episodes_by_database_id_.remove(episode_id);
+    }
+
+    // Remove this episode's row
+    model_->removeRow(item->row());
+  }
+
+}
+
+void PodcastService::EpisodesAdded(const PodcastEpisodeList &episodes) {
+
+  QSet<int> seen_podcast_ids;
+
+  for (const PodcastEpisode &episode : episodes) {
+    const int database_id = episode.podcast_database_id();
+    QStandardItem *parent = podcasts_by_database_id_[database_id];
+    if (!parent) continue;
+
+    parent->appendRow(CreatePodcastEpisodeItem(episode));
+    if (!seen_podcast_ids.contains(database_id)) {
+      // Update the unlistened count text once for each podcast
+      int unlistened_count = 0;
+      for (const PodcastEpisode &i : backend_->GetEpisodes(database_id)) {
+        if (!i.listened()) {
+          ++unlistened_count;
+        }
+      }
+
+      UpdatePodcastText(parent, unlistened_count);
+      seen_podcast_ids.insert(database_id);
+    }
+    const Podcast podcast = parent->data(Role_Podcast).value<Podcast>();
+    ReloadPodcast(podcast);
+  }
+
+}
+
+void PodcastService::EpisodesUpdated(const PodcastEpisodeList &episodes) {
+
+  QSet<int> seen_podcast_ids;
+  QMap<int, Podcast> podcasts_map;
+
+  for (const PodcastEpisode &episode : episodes) {
+    const int podcast_database_id = episode.podcast_database_id();
+    QStandardItem *item = episodes_by_database_id_[episode.database_id()];
+    QStandardItem *parent = podcasts_by_database_id_[podcast_database_id];
+    if (!item || !parent) continue;
+    // Update the episode data on the item, and update the item's text.
+    item->setData(QVariant::fromValue(episode), Role_Episode);
+    UpdateEpisodeText(item);
+
+    // Update the parent podcast's text too.
+    if (!seen_podcast_ids.contains(podcast_database_id)) {
+      // Update the unlistened count text once for each podcast
+      int unlistened_count = 0;
+      for (const PodcastEpisode &i : backend_->GetEpisodes(podcast_database_id)) {
+        if (!i.listened()) {
+          ++unlistened_count;
+        }
+      }
+
+      UpdatePodcastText(parent, unlistened_count);
+      seen_podcast_ids.insert(podcast_database_id);
+    }
+    const Podcast podcast = parent->data(Role_Podcast).value<Podcast>();
+    podcasts_map[podcast.database_id()] = podcast;
+  }
+
+  QList<Podcast> podcast_values = podcasts_map.values();
+  for (const Podcast &podcast_tmp : podcast_values) {
+    ReloadPodcast(podcast_tmp);
+  }
+
+}
+
+void PodcastService::DownloadSelectedEpisode() {
+
+  for (const QModelIndex &idx : selected_episodes_) {
+    app_->podcast_downloader()->DownloadEpisode(idx.data(Role_Episode).value<PodcastEpisode>());
+  }
+
+}
+
+void PodcastService::PodcastInfo() {
+
+  if (selected_podcasts_.isEmpty()) {
+    // Should never happen.
+    return;
+  }
+  const Podcast podcast = selected_podcasts_[0].data(Role_Podcast).value<Podcast>();
+  podcast_info_dialog_.reset(new PodcastInfoDialog(app_));
+
+  if (selected_episodes_.count() == 1) {
+    const PodcastEpisode episode = selected_episodes_[0].data(Role_Episode).value<PodcastEpisode>();
+    podcast_info_dialog_->ShowEpisode(episode, podcast);
+  }
+  else {
+    podcast_info_dialog_->ShowPodcast(podcast);
+  }
+
+}
+
+void PodcastService::DeleteDownloadedData() {
+
+  for (const QModelIndex &idx : selected_episodes_) {
+    app_->podcast_deleter()->DeleteEpisode(idx.data(Role_Episode).value<PodcastEpisode>());
+  }
+
+}
+
+void PodcastService::DownloadProgressChanged(const PodcastEpisode &episode, const PodcastDownload::State state, const int percent) {
+
+  QStandardItem *item = episodes_by_database_id_[episode.database_id()];
+  QStandardItem *item2 = podcasts_by_database_id_[episode.podcast_database_id()];
+  if (!item || !item2) return;
+
+  UpdateEpisodeText(item, state, percent);
+  UpdatePodcastText(item2, state, percent);
+
+}
+
+void PodcastService::ShowConfig() {
+  //app_->OpenSettingsDialogAtPage(SettingsDialog::Page_Podcasts);
+}
+
+void PodcastService::CurrentSongChanged(const Song &metadata) {
+
+  // This does two db queries, and we are called on every song change, so run this off the main thread.
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+  (void)QtConcurrent::run(&PodcastService::UpdatePodcastListenedStateAsync, this, metadata);
+#else
+  (void)QtConcurrent::run(this, &PodcastService::UpdatePodcastListenedStateAsync, metadata);
+#endif
+}
+
+void PodcastService::UpdatePodcastListenedStateAsync(const Song &metadata) {
+
+  // Check whether this song is one of our podcast episodes.
+  PodcastEpisode episode = backend_->GetEpisodeByUrlOrLocalUrl(metadata.url());
+  if (!episode.is_valid()) return;
+
+  // Mark it as listened if it's not already
+  if (!episode.listened() || !episode.listened_date().isValid()) {
+    episode.set_listened(true);
+    episode.set_listened_date(QDateTime::currentDateTime());
+    backend_->UpdateEpisodes(PodcastEpisodeList() << episode);
+  }
+
+}
+
+void PodcastService::SetNew() {
+  SetListened(selected_episodes_, explicitly_selected_podcasts_, false);
+}
+
+void PodcastService::SetListened() {
+
+  if (selected_episodes_.isEmpty() && explicitly_selected_podcasts_.isEmpty()) {
+    SetListened(backend_->GetNewDownloadedEpisodes(), true);
+  }
+  else {
+    SetListened(selected_episodes_, explicitly_selected_podcasts_, true);
+  }
+
+}
+
+void PodcastService::SetListened(const PodcastEpisodeList &episodes_list, const bool listened) {
+
+  PodcastEpisodeList episodes;
+  QDateTime current_date_time = QDateTime::currentDateTime();
+  for (PodcastEpisode episode : episodes_list) {
+    episode.set_listened(listened);
+    if (listened) {
+      episode.set_listened_date(current_date_time);
+    }
+    episodes << episode;
+  }
+
+  backend_->UpdateEpisodes(episodes);
+
+}
+
+void PodcastService::SetListened(const QModelIndexList &episode_indexes, const QModelIndexList& podcast_indexes, const bool listened) {
+
+  PodcastEpisodeList episodes;
+
+  // Get all the episodes from the indexes.
+  for (const QModelIndex& index : episode_indexes) {
+    episodes << index.data(Role_Episode).value<PodcastEpisode>();
+  }
+
+  for (const QModelIndex& podcast : podcast_indexes) {
+    for (int i = 0; i < podcast.model()->rowCount(podcast); ++i) {
+      const QModelIndex& index = podcast.model()->index(i, 0, podcast);
+      episodes << index.data(Role_Episode).value<PodcastEpisode>();
+    }
+  }
+
+  // Update each one with the new state and maybe the listened time.
+  QDateTime current_date_time = QDateTime::currentDateTime();
+  for (int i = 0; i < episodes.count(); ++i) {
+    PodcastEpisode *episode = &episodes[i];
+    episode->set_listened(listened);
+    if (listened) {
+      episode->set_listened_date(current_date_time);
+    }
+  }
+
+  backend_->UpdateEpisodes(episodes);
+
+}
+
+QModelIndex PodcastService::MapToMergedModel(const QModelIndex &idx) const {
+
+  Q_UNUSED(idx)
+  //return model()->merged_model()->mapFromSource(proxy_->mapFromSource(index));
+  return QModelIndex();
+
+}
+
+void PodcastService::LazyLoadRoot() {
+
+#if 0
+  if (root_->data(InternetModel::Role_CanLazyLoad).toBool()) {
+    root_->setData(false, InternetModel::Role_CanLazyLoad);
+    LazyPopulate(root_);
+  }
+#endif
+
+}
+
+void PodcastService::SubscribeAndShow(const QVariant &podcast_or_opml) {
+
+  if (podcast_or_opml.canConvert<Podcast>()) {
+    Podcast podcast(podcast_or_opml.value<Podcast>());
+    backend_->Subscribe(&podcast);
+
+    // Lazy load the root item if it hasn't been already
+    LazyLoadRoot();
+
+    QStandardItem *item = podcasts_by_database_id_[podcast.database_id()];
+    if (item) {
+      // There will be an item already if this podcast was already there, otherwise it'll be scrolled to when the item is created.
+      //emit ScrollToIndex(MapToMergedModel(item->index()));
+    }
+  }
+  else if (podcast_or_opml.canConvert<OpmlContainer>()) {
+    EnsureAddPodcastDialogCreated();
+
+    add_podcast_dialog_->ShowWithOpml(podcast_or_opml.value<OpmlContainer>());
+  }
+
+}
+
+void PodcastService::ReloadPodcast(const Podcast &podcast) {
+
+  if (!(hide_listened_ || (show_episodes_ > 0))) {
+    return;
+  }
+  QStandardItem *item = podcasts_by_database_id_[podcast.database_id()];
+
+  model_->invisibleRootItem()->removeRow(item->row());
+  model_->invisibleRootItem()->appendRow(CreatePodcastItem(podcast));
+
+}

src/podcasts/podcastservice.h

@@ -0,0 +1,178 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012-2013, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2013-2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2014, Simeon Bird <sbird@andrew.cmu.edu>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTSERVICE_H
+#define PODCASTSERVICE_H
+
+#include <memory>
+
+#include <QMap>
+#include <QIcon>
+#include <QScopedPointer>
+
+//#include "internet/internetmodel.h"
+#include "internet/internetservice.h"
+#include "podcastdeleter.h"
+#include "podcastdownloader.h"
+
+class QMenu;
+class QAction;
+
+class AddPodcastDialog;
+class PodcastInfoDialog;
+class OrganizeDialog;
+class Podcast;
+class PodcastBackend;
+class PodcastEpisode;
+class StandardItemIconLoader;
+
+class QStandardItemModel;
+class QStandardItem;
+class QSortFilterProxyModel;
+
+class PodcastService : public InternetService {
+  Q_OBJECT
+
+ public:
+  PodcastService(Application *app, QObject *parent);
+  ~PodcastService();
+
+  static const char *kServiceName;
+  static const char *kSettingsGroup;
+
+  enum Type {
+    Type_AddPodcast = 0,
+    Type_Podcast,
+    Type_Episode
+  };
+
+  enum Role {
+    Role_Podcast = 0,
+    Role_Episode
+  };
+
+  QStandardItem *CreateRootItem();
+  void LazyPopulate(QStandardItem *parent);
+  bool has_initial_load_settings() const { return true; }
+  void ShowContextMenu(const QPoint &global_pos);
+  void ReloadSettings();
+  void InitialLoadSettings();
+  // Called by SongLoader when the user adds a Podcast URL directly.
+  // Adds a subscription to the podcast and displays it in the UI.
+  // If the QVariant contains an OPML file then this displays it in the Add Podcast dialog.
+  void SubscribeAndShow(const QVariant &podcast_or_opml);
+
+ public slots:
+  void AddPodcast();
+  void FileCopied(const int database_id);
+
+ private slots:
+  void UpdateSelectedPodcast();
+  void ReloadPodcast(const Podcast &podcast);
+  void RemoveSelectedPodcast();
+  void DownloadSelectedEpisode();
+  void PodcastInfo();
+  void DeleteDownloadedData();
+  void SetNew();
+  void SetListened();
+  void ShowConfig();
+
+  void SubscriptionAdded(const Podcast &podcast);
+  void SubscriptionRemoved(const Podcast &podcast);
+  void EpisodesAdded(const PodcastEpisodeList &episodes);
+  void EpisodesUpdated(const PodcastEpisodeList &episodes);
+
+  void DownloadProgressChanged(const PodcastEpisode &episode, PodcastDownload::State state, int percent);
+
+  void CurrentSongChanged(const Song &metadata);
+
+  void CopyToDevice();
+  void CopyToDevice(const PodcastEpisodeList &episodes_list);
+  void CopyToDevice(const QModelIndexList &episode_indexes, const QModelIndexList &podcast_indexes);
+  void CancelDownload();
+  void CancelDownload(const QModelIndexList &episode_indexes, const QModelIndexList &podcast_indexes);
+
+ private:
+  void EnsureAddPodcastDialogCreated();
+
+  void UpdatePodcastListenedStateAsync(const Song &metadata);
+  void PopulatePodcastList(QStandardItem *parent);
+  void ClearPodcastList(QStandardItem *parent);
+  void UpdatePodcastText(QStandardItem *item, const int unlistened_count) const;
+  void UpdateEpisodeText(QStandardItem *item, const PodcastDownload::State state = PodcastDownload::NotDownloading, const int percent = 0);
+  void UpdatePodcastText(QStandardItem *item, const PodcastDownload::State state = PodcastDownload::NotDownloading, const int percent = 0);
+
+  QStandardItem *CreatePodcastItem(const Podcast &podcast);
+  QStandardItem *CreatePodcastEpisodeItem(const PodcastEpisode &episode);
+
+  QModelIndex MapToMergedModel(const QModelIndex &idx) const;
+
+  void SetListened(const QModelIndexList &episode_indexes, const QModelIndexList &podcast_indexes, const bool listened);
+  void SetListened(const PodcastEpisodeList &episodes_list, bool listened);
+
+  void LazyLoadRoot();
+
+ private:
+  bool use_pretty_covers_;
+  bool hide_listened_;
+  qint64 show_episodes_;
+  StandardItemIconLoader *icon_loader_;
+
+  // The podcast icon
+  QIcon default_icon_;
+
+  // Episodes get different icons depending on their state
+  QIcon queued_icon_;
+  QIcon downloading_icon_;
+  QIcon downloaded_icon_;
+
+  PodcastBackend *backend_;
+  QStandardItemModel *model_;
+  QSortFilterProxyModel *proxy_;
+
+  QMenu *context_menu_;
+  QAction *update_selected_action_;
+  QAction *remove_selected_action_;
+  QAction *download_selected_action_;
+  QAction *info_selected_action_;
+  QAction *delete_downloaded_action_;
+  QAction *set_new_action_;
+  QAction *set_listened_action_;
+  QAction *copy_to_device_;
+  QAction *cancel_download_;
+  QStandardItem *root_;
+  std::unique_ptr<OrganizeDialog> organize_dialog_;
+
+  QModelIndexList explicitly_selected_podcasts_;
+  QModelIndexList selected_podcasts_;
+  QModelIndexList selected_episodes_;
+
+  QMap<int, QStandardItem*> podcasts_by_database_id_;
+  QMap<int, QStandardItem*> episodes_by_database_id_;
+
+  std::unique_ptr<AddPodcastDialog> add_podcast_dialog_;
+  std::unique_ptr<PodcastInfoDialog> podcast_info_dialog_;
+};
+
+#endif  // PODCASTSERVICE_H

src/podcasts/podcastservicemodel.cpp

@@ -0,0 +1,101 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QList>
+#include <QVariant>
+#include <QUrl>
+#include <QMimeData>
+
+#include "podcastservicemodel.h"
+
+#include "podcastservice.h"
+#include "playlist/songmimedata.h"
+
+PodcastServiceModel::PodcastServiceModel(QObject* parent) : QStandardItemModel(parent) {}
+
+QMimeData* PodcastServiceModel::mimeData(const QModelIndexList &indexes) const {
+  SongMimeData *data = new SongMimeData;
+  QList<QUrl> urls;
+#if 0
+  for (const QModelIndex& index : indexes) {
+    switch (index.data(InternetModel::Role_Type).toInt()) {
+      case PodcastService::Type_Episode:
+        MimeDataForEpisode(index, data, &urls);
+        break;
+
+      case PodcastService::Type_Podcast:
+        MimeDataForPodcast(index, data, &urls);
+        break;
+    }
+  }
+#endif
+
+  data->setUrls(urls);
+  return data;
+
+}
+
+void PodcastServiceModel::MimeDataForEpisode(const QModelIndex &idx, SongMimeData *data, QList<QUrl>* urls) const {
+
+  QVariant episode_variant = idx.data(PodcastService::Role_Episode);
+  if (!episode_variant.isValid()) return;
+
+  PodcastEpisode episode(episode_variant.value<PodcastEpisode>());
+
+  // Get the podcast from the index's parent
+  Podcast podcast;
+  QVariant podcast_variant = idx.parent().data(PodcastService::Role_Podcast);
+  if (podcast_variant.isValid()) {
+    podcast = podcast_variant.value<Podcast>();
+  }
+
+  Song song = episode.ToSong(podcast);
+
+  data->songs << song;
+  *urls << song.url();
+
+}
+
+void PodcastServiceModel::MimeDataForPodcast(const QModelIndex &idx, SongMimeData *data, QList<QUrl> *urls) const {
+
+  // Get the podcast
+  Podcast podcast;
+  QVariant podcast_variant = idx.data(PodcastService::Role_Podcast);
+  if (podcast_variant.isValid()) {
+    podcast = podcast_variant.value<Podcast>();
+  }
+
+  // Add each child episode
+  const int children = idx.model()->rowCount(idx);
+  for (int i = 0; i < children; ++i) {
+    QVariant episode_variant = idx.model()->index(i, 0, idx).data(PodcastService::Role_Episode);
+    if (!episode_variant.isValid()) continue;
+
+    PodcastEpisode episode(episode_variant.value<PodcastEpisode>());
+    Song song = episode.ToSong(podcast);
+
+    data->songs << song;
+    *urls << song.url();
+  }
+
+}

src/podcasts/podcastservicemodel.h

@@ -0,0 +1,46 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTSERVICEMODEL_H
+#define PODCASTSERVICEMODEL_H
+
+#include <QStandardItemModel>
+#include <QList>
+#include <QUrl>
+
+class SongMimeData;
+
+class PodcastServiceModel : public QStandardItemModel {
+  Q_OBJECT
+
+ public:
+  explicit PodcastServiceModel(QObject *parent = nullptr);
+
+  QMimeData* mimeData(const QModelIndexList &indexes) const;
+
+ private:
+  void MimeDataForPodcast(const QModelIndex &idx, SongMimeData* data, QList<QUrl> *urls) const;
+  void MimeDataForEpisode(const QModelIndex &idx, SongMimeData* data, QList<QUrl> *urls) const;
+};
+
+#endif  // PODCASTSERVICEMODEL_H

src/podcasts/podcastupdater.cpp

@@ -0,0 +1,194 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "podcastupdater.h"
+
+#include <QObject>
+#include <QSet>
+#include <QList>
+#include <QUrl>
+#include <QDateTime>
+#include <QTimer>
+#include <QSettings>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/timeconstants.h"
+#include "podcastbackend.h"
+#include "podcasturlloader.h"
+
+const char *PodcastUpdater::kSettingsGroup = "Podcasts";
+
+PodcastUpdater::PodcastUpdater(Application *app, QObject *parent)
+    : QObject(parent),
+      app_(app),
+      update_interval_secs_(0),
+      update_timer_(new QTimer(this)),
+      loader_(new PodcastUrlLoader(this)),
+      pending_replies_(0) {
+
+  update_timer_->setSingleShot(true);
+
+  QObject::connect(app_, &Application::SettingsChanged, this, &PodcastUpdater::ReloadSettings);
+  QObject::connect(update_timer_, &QTimer::timeout, this, &PodcastUpdater::UpdateAllPodcastsNow);
+  QObject::connect(app_->podcast_backend(), &PodcastBackend::SubscriptionAdded, this, &PodcastUpdater::SubscriptionAdded);
+
+  ReloadSettings();
+
+}
+
+void PodcastUpdater::ReloadSettings() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  last_full_update_ = s.value("last_full_update").toDateTime();
+  update_interval_secs_ = s.value("update_interval_secs").toInt();
+
+  s.endGroup();
+
+  RestartTimer();
+
+}
+
+void PodcastUpdater::SaveSettings() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  s.setValue("last_full_update", last_full_update_);
+  s.endGroup();
+
+}
+
+void PodcastUpdater::RestartTimer() {
+
+  // Stop any existing timer
+  update_timer_->stop();
+
+  if (pending_replies_ > 0) {
+    // We're still waiting for replies from the last update - don't do anything.
+    return;
+  }
+
+  if (update_interval_secs_ > 0) {
+    if (!last_full_update_.isValid()) {
+      // Updates are enabled and we've never updated before.  Do it now.
+      qLog(Info) << "Updating podcasts for the first time";
+      UpdateAllPodcastsNow();
+    }
+    else {
+      const QDateTime next_update = last_full_update_.addSecs(update_interval_secs_);
+      const int secs_until_next_update = QDateTime::currentDateTime().secsTo(next_update);
+
+      if (secs_until_next_update < 0) {
+        qLog(Info) << "Updating podcasts" << (-secs_until_next_update) << "seconds late";
+        UpdateAllPodcastsNow();
+      }
+      else {
+        qLog(Info) << "Updating podcasts at" << next_update << "(in" << secs_until_next_update << "seconds)";
+        update_timer_->start(secs_until_next_update * kMsecPerSec);
+      }
+    }
+  }
+
+}
+
+void PodcastUpdater::SubscriptionAdded(const Podcast& podcast) {
+
+  // Only update a new podcast immediately if it doesn't have an episode list.
+  // We assume that the episode list has already been fetched recently otherwise.
+  if (podcast.episodes().isEmpty()) {
+    UpdatePodcastNow(podcast);
+  }
+
+}
+
+void PodcastUpdater::UpdatePodcastNow(const Podcast& podcast) {
+
+  PodcastUrlLoaderReply *reply = loader_->Load(podcast.url());
+  QObject::connect(reply, &PodcastUrlLoaderReply::Finished, this, [this, reply, podcast]() { PodcastLoaded(reply, podcast, false); });
+
+}
+
+void PodcastUpdater::UpdateAllPodcastsNow() {
+
+  PodcastList podcasts = app_->podcast_backend()->GetAllSubscriptions();
+  for (const Podcast &podcast : podcasts) {
+    PodcastUrlLoaderReply *reply = loader_->Load(podcast.url());
+    QObject::connect(reply, &PodcastUrlLoaderReply::Finished, this, [this, reply, podcast]() { PodcastLoaded(reply, podcast, true); });
+
+    ++pending_replies_;
+  }
+
+}
+
+void PodcastUpdater::PodcastLoaded(PodcastUrlLoaderReply *reply, const Podcast& podcast, bool one_of_many) {
+
+  reply->deleteLater();
+
+  if (one_of_many) {
+    --pending_replies_;
+    if (pending_replies_ == 0) {
+      // This was the last reply we were waiting for.  Save this time as being
+      // the last successful update and restart the timer.
+      last_full_update_ = QDateTime::currentDateTime();
+      SaveSettings();
+      RestartTimer();
+    }
+  }
+
+  if (!reply->is_success()) {
+    qLog(Warning) << "Error fetching podcast at" << podcast.url() << ":" << reply->error_text();
+    return;
+  }
+
+  if (reply->result_type() != PodcastUrlLoaderReply::Type_Podcast) {
+    qLog(Warning) << "The URL" << podcast.url() << "no longer contains a podcast";
+    return;
+  }
+
+  // Get the episode URLs we had for this podcast already.
+  QSet<QUrl> existing_urls;
+  for (const PodcastEpisode &episode :
+    app_->podcast_backend()->GetEpisodes(podcast.database_id())) {
+    existing_urls.insert(episode.url());
+  }
+
+  // Add any new episodes
+  PodcastEpisodeList new_episodes;
+  PodcastList reply_podcasts = reply->podcast_results();
+  for (const Podcast &reply_podcast : reply_podcasts) {
+    PodcastEpisodeList episodes = reply_podcast.episodes();
+    for (const PodcastEpisode &episode : episodes) {
+      if (!existing_urls.contains(episode.url())) {
+        PodcastEpisode episode_copy(episode);
+        episode_copy.set_podcast_database_id(podcast.database_id());
+        new_episodes.append(episode_copy);
+      }
+    }
+  }
+
+  app_->podcast_backend()->AddEpisodes(&new_episodes);
+  qLog(Info) << "Added" << new_episodes.count() << "new episodes for" << podcast.url();
+
+}

src/podcasts/podcastupdater.h

@@ -0,0 +1,71 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTUPDATER_H
+#define PODCASTUPDATER_H
+
+#include <QObject>
+#include <QDateTime>
+
+class Application;
+class Podcast;
+class PodcastUrlLoader;
+class PodcastUrlLoaderReply;
+
+class QTimer;
+
+// Responsible for updating podcasts when they're first subscribed to, and then updating them at regular intervals afterwards.
+class PodcastUpdater : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit PodcastUpdater(Application *app, QObject *parent = nullptr);
+
+ public slots:
+  void UpdateAllPodcastsNow();
+  void UpdatePodcastNow(const Podcast &podcast);
+
+ private slots:
+  void ReloadSettings();
+
+  void SubscriptionAdded(const Podcast &podcast);
+  void PodcastLoaded(PodcastUrlLoaderReply *reply, const Podcast &podcast, const bool one_of_many);
+
+ private:
+  void RestartTimer();
+  void SaveSettings();
+
+ private:
+  static const char *kSettingsGroup;
+
+  Application *app_;
+
+  QDateTime last_full_update_;
+  int update_interval_secs_;
+
+  QTimer *update_timer_;
+  PodcastUrlLoader *loader_;
+  int pending_replies_;
+};
+
+#endif  // PODCASTUPDATER_H

src/podcasts/podcasturlloader.cpp

@@ -0,0 +1,250 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QObject>
+#include <QUrl>
+#include <QUrlQuery>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+
+#include "core/logging.h"
+#include "core/networkaccessmanager.h"
+#include "core/utilities.h"
+#include "podcasturlloader.h"
+#include "podcastparser.h"
+
+const int PodcastUrlLoader::kMaxRedirects = 5;
+
+PodcastUrlLoader::PodcastUrlLoader(QObject* parent)
+    : QObject(parent),
+      network_(new NetworkAccessManager(this)),
+      parser_(new PodcastParser),
+      html_link_re_("<link (.*)>"),
+      html_link_rel_re_("rel\\s*=\\s*['\"]?\\s*alternate"),
+      html_link_type_re_("type\\s*=\\s*['\"]?([^'\" ]+)"),
+      html_link_href_re_("href\\s*=\\s*['\"]?([^'\" ]+)") {
+
+  //html_link_re_.setMinimal(true);
+  //html_link_re_.setCaseSensitivity(Qt::CaseInsensitive);
+
+}
+
+PodcastUrlLoader::~PodcastUrlLoader() { delete parser_; }
+
+QUrl PodcastUrlLoader::FixPodcastUrl(const QString& url_text) {
+
+  QString url_text_copy(url_text.trimmed());
+
+  // Thanks gpodder!
+  QuickPrefixList quick_prefixes = QuickPrefixList()
+    << QuickPrefix("fb:", "http://feeds.feedburner.com/%1")
+    << QuickPrefix("yt:", "https://www.youtube.com/rss/user/%1/videos.rss")
+    << QuickPrefix("sc:", "https://soundcloud.com/%1")
+    << QuickPrefix("fm4od:", "http://onapp1.orf.at/webcam/fm4/fod/%1.xspf")
+    << QuickPrefix("ytpl:", "https://gdata.youtube.com/feeds/api/playlists/%1");
+
+  // Check if it matches one of the quick prefixes.
+  for (QuickPrefixList::const_iterator it = quick_prefixes.constBegin(); it != quick_prefixes.constEnd(); ++it) {
+    if (url_text_copy.startsWith(it->first)) {
+      url_text_copy = it->second.arg(url_text_copy.mid(it->first.length()));
+    }
+  }
+
+  if (!url_text_copy.contains("://")) {
+    url_text_copy.prepend("http://");
+  }
+
+  return FixPodcastUrl(QUrl(url_text_copy));
+
+}
+
+QUrl PodcastUrlLoader::FixPodcastUrl(const QUrl& url_orig) {
+
+  QUrl url(url_orig);
+  QUrlQuery url_query(url);
+
+  // Replace schemes
+  if (url.scheme().isEmpty() || url.scheme() == "feed" || url.scheme() == "itpc" || url.scheme() == "itms") {
+    url.setScheme("http");
+  }
+  else if (url.scheme() == "zune" && url.host() == "subscribe" &&
+    !url_query.queryItems().isEmpty()) {
+    url = QUrl(url_query.queryItems()[0].second);
+  }
+
+  return url;
+
+}
+
+PodcastUrlLoaderReply* PodcastUrlLoader::Load(const QString& url_text) {
+  return Load(FixPodcastUrl(url_text));
+}
+
+PodcastUrlLoaderReply* PodcastUrlLoader::Load(const QUrl& url) {
+
+  // Create a reply
+  PodcastUrlLoaderReply* reply = new PodcastUrlLoaderReply(url, this);
+
+  // Create a state object to track this request
+  RequestState* state = new RequestState;
+  state->redirects_remaining_ = kMaxRedirects + 1;
+  state->reply_ = reply;
+
+  // Start the first request
+  NextRequest(url, state);
+
+  return reply;
+
+}
+
+void PodcastUrlLoader::SendErrorAndDelete(const QString& error_text, RequestState* state) {
+
+  state->reply_->SetFinished(error_text);
+  delete state;
+
+}
+
+void PodcastUrlLoader::NextRequest(const QUrl& url, RequestState* state) {
+
+  // Stop the request if there have been too many redirects already.
+  if (state->redirects_remaining_-- == 0) {
+    SendErrorAndDelete(tr("Too many redirects"), state);
+    return;
+  }
+
+  qLog(Debug) << "Loading URL" << url;
+
+  QNetworkRequest req(url);
+  req.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::AlwaysNetwork);
+  QNetworkReply* network_reply = network_->get(req);
+
+  QObject::connect(network_reply, &QNetworkReply::finished, this, [this, state, network_reply]() { RequestFinished(state, network_reply); });
+
+}
+
+void PodcastUrlLoader::RequestFinished(RequestState* state, QNetworkReply* reply) {
+
+  reply->deleteLater();
+
+  if (reply->attribute(QNetworkRequest::RedirectionTargetAttribute).isValid()) {
+    const QUrl next_url = reply->url().resolved(reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl());
+
+    NextRequest(next_url, state);
+    return;
+  }
+
+  // Check for errors.
+  if (reply->error() != QNetworkReply::NoError) {
+    SendErrorAndDelete(reply->errorString(), state);
+    return;
+  }
+
+  const QVariant http_status = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
+  if (http_status.isValid() && http_status.toInt() != 200) {
+    SendErrorAndDelete(
+      QString("HTTP %1: %2").arg(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute) .toString(), reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString()),
+      state);
+    return;
+  }
+
+  // Check the mime type.
+  const QString content_type = reply->header(QNetworkRequest::ContentTypeHeader).toString();
+  if (parser_->SupportsContentType(content_type)) {
+    const QVariant ret = parser_->Load(reply, reply->url());
+
+    if (ret.canConvert<Podcast>()) {
+      state->reply_->SetFinished(PodcastList() << ret.value<Podcast>());
+    }
+    else if (ret.canConvert<OpmlContainer>()) {
+      state->reply_->SetFinished(ret.value<OpmlContainer>());
+    }
+    else {
+      SendErrorAndDelete(tr("Failed to parse the XML for this RSS feed"),
+        state);
+      return;
+    }
+
+    delete state;
+    return;
+  }
+  else if (content_type.contains("text/html")) {
+    // I don't want a full HTML parser here, so do this the dirty way.
+    const QString page_text = QString::fromUtf8(reply->readAll());
+    //int pos = 0;
+#if 0
+    while ((pos = html_link_re_.indexIn(page_text, pos)) != -1) {
+      const QString link = html_link_re_.cap(1).toLower();
+      pos += html_link_re_.matchedLength();
+
+      if (html_link_rel_re_.indexIn(link) == -1 ||
+        html_link_type_re_.indexIn(link) == -1 ||
+        html_link_href_re_.indexIn(link) == -1) {
+        continue;
+      }
+
+      const QString link_type = html_link_type_re_.cap(1);
+      const QString href = Utilities::DecodeHtmlEntities(html_link_href_re_.cap(1));
+
+      if (parser_->supported_mime_types().contains(link_type)) {
+        NextRequest(QUrl(href), state);
+        return;
+      }
+    }
+#endif
+
+    SendErrorAndDelete(tr("HTML page did not contain any RSS feeds"), state);
+  }
+  else {
+    SendErrorAndDelete(tr("Unknown content-type") + ": " + content_type, state);
+  }
+
+}
+
+PodcastUrlLoaderReply::PodcastUrlLoaderReply(const QUrl& url, QObject* parent)
+    : QObject(parent), url_(url), finished_(false) {}
+
+void PodcastUrlLoaderReply::SetFinished(const PodcastList& results) {
+
+  result_type_ = Type_Podcast;
+  podcast_results_ = results;
+  finished_ = true;
+  emit Finished(true);
+
+}
+
+void PodcastUrlLoaderReply::SetFinished(const OpmlContainer& results) {
+
+  result_type_ = Type_Opml;
+  opml_results_ = results;
+  finished_ = true;
+  emit Finished(true);
+
+}
+
+void PodcastUrlLoaderReply::SetFinished(const QString& error_text) {
+
+  error_text_ = error_text;
+  finished_ = true;
+  emit Finished(false);
+
+}

src/podcasts/podcasturlloader.h

@@ -0,0 +1,119 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2012, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PODCASTURLLOADER_H
+#define PODCASTURLLOADER_H
+
+#include <QObject>
+#include <QRegularExpression>
+
+#include "opmlcontainer.h"
+#include "podcast.h"
+
+class PodcastParser;
+
+class QNetworkAccessManager;
+class QNetworkReply;
+
+class PodcastUrlLoaderReply : public QObject {
+  Q_OBJECT
+
+ public:
+  PodcastUrlLoaderReply(const QUrl& url, QObject* parent);
+
+  enum ResultType { Type_Podcast,
+    Type_Opml };
+
+  const QUrl& url() const { return url_; }
+  bool is_finished() const { return finished_; }
+  bool is_success() const { return error_text_.isEmpty(); }
+  const QString& error_text() const { return error_text_; }
+
+  ResultType result_type() const { return result_type_; }
+  const PodcastList& podcast_results() const { return podcast_results_; }
+  const OpmlContainer& opml_results() const { return opml_results_; }
+
+  void SetFinished(const QString& error_text);
+  void SetFinished(const PodcastList& results);
+  void SetFinished(const OpmlContainer& results);
+
+ signals:
+  void Finished(bool success);
+
+ private:
+  QUrl url_;
+  bool finished_;
+  QString error_text_;
+
+  ResultType result_type_;
+  PodcastList podcast_results_;
+  OpmlContainer opml_results_;
+};
+
+class PodcastUrlLoader : public QObject {
+  Q_OBJECT
+
+ public:
+  explicit PodcastUrlLoader(QObject* parent = nullptr);
+  ~PodcastUrlLoader();
+
+  static const int kMaxRedirects;
+
+  PodcastUrlLoaderReply* Load(const QString& url_text);
+  PodcastUrlLoaderReply* Load(const QUrl& url);
+
+  // Both the FixPodcastUrl functions replace common podcatcher URL schemes
+  // like itpc:// or zune:// with their http:// equivalents.  The QString
+  // overload also cleans up user-entered text a bit - stripping whitespace and
+  // applying shortcuts like sc:tag.
+  static QUrl FixPodcastUrl(const QString& url_text);
+  static QUrl FixPodcastUrl(const QUrl& url);
+
+ private:
+  struct RequestState {
+    int redirects_remaining_;
+    PodcastUrlLoaderReply* reply_;
+  };
+
+  typedef QPair<QString, QString> QuickPrefix;
+  typedef QList<QuickPrefix> QuickPrefixList;
+
+ private slots:
+  void RequestFinished(RequestState* state, QNetworkReply* reply);
+
+ private:
+  void SendErrorAndDelete(const QString& error_text, RequestState* state);
+  void NextRequest(const QUrl& url, RequestState* state);
+
+ private:
+  QNetworkAccessManager* network_;
+  PodcastParser* parser_;
+
+  QRegularExpression html_link_re_;
+  QRegularExpression whitespace_re_;
+  QRegularExpression html_link_rel_re_;
+  QRegularExpression html_link_type_re_;
+  QRegularExpression html_link_href_re_;
+};
+
+#endif  // PODCASTURLLOADER_H

src/settings/podcastsettingspage.cpp

@@ -0,0 +1,146 @@
+/* This file is part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+   Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+   Copyright 2014, John Maguire <john.maguire@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "podcastsettingspage.h"
+
+#include <QFileDialog>
+#include <QSettings>
+
+#include "core/application.h"
+#include "core/timeconstants.h"
+#include "core/iconloader.h"
+#include "collection/collectiondirectorymodel.h"
+#include "collection/collectionmodel.h"
+#include "podcasts/gpoddersync.h"
+#include "podcasts/podcastdownloader.h"
+#include "settingsdialog.h"
+#include "ui_podcastsettingspage.h"
+
+const char* PodcastSettingsPage::kSettingsGroup = "Podcasts";
+
+PodcastSettingsPage::PodcastSettingsPage(SettingsDialog* dialog)
+    : SettingsPage(dialog), ui_(new Ui_PodcastSettingsPage) {
+  ui_->setupUi(this);
+  setWindowIcon(IconLoader::Load("podcast"));
+
+  connect(ui_->login, SIGNAL(clicked()), SLOT(LoginClicked()));
+  connect(ui_->login_state, SIGNAL(LoginClicked()), SLOT(LoginClicked()));
+  connect(ui_->login_state, SIGNAL(LogoutClicked()), SLOT(LogoutClicked()));
+  connect(ui_->download_dir_browse, SIGNAL(clicked()),
+    SLOT(DownloadDirBrowse()));
+
+  GPodderSync* gsync = dialog->app()->gpodder_sync();
+  connect(gsync, SIGNAL(LoginSuccess()), SLOT(GpodderLoginSuccess()));
+  connect(gsync, SIGNAL(LoginFailure(const QString&)), SLOT(GpodderLoginFailure(const QString&)));
+
+  ui_->login_state->AddCredentialField(ui_->username);
+  ui_->login_state->AddCredentialField(ui_->device_name);
+  ui_->login_state->AddCredentialField(ui_->password);
+  ui_->login_state->AddCredentialGroup(ui_->login_group);
+
+  ui_->check_interval->setItemData(0, 0);             // manually
+  ui_->check_interval->setItemData(1, 10 * 60);       // 10 minutes
+  ui_->check_interval->setItemData(2, 20 * 60);       // 20 minutes
+  ui_->check_interval->setItemData(3, 30 * 60);       // 30 minutes
+  ui_->check_interval->setItemData(4, 60 * 60);       // 1 hour
+  ui_->check_interval->setItemData(5, 2 * 60 * 60);   // 2 hours
+  ui_->check_interval->setItemData(6, 6 * 60 * 60);   // 6 hours
+  ui_->check_interval->setItemData(7, 12 * 60 * 60);  // 12 hours
+}
+
+PodcastSettingsPage::~PodcastSettingsPage() { delete ui_; }
+
+void PodcastSettingsPage::Load() {
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  const int update_interval = s.value("update_interval_secs", 0).toInt();
+  ui_->check_interval->setCurrentIndex(
+    ui_->check_interval->findData(update_interval));
+
+  const QString default_download_dir =
+    dialog()->app()->podcast_downloader()->DefaultDownloadDir();
+  ui_->download_dir->setText(QDir::toNativeSeparators(
+    s.value("download_dir", default_download_dir).toString()));
+
+  ui_->auto_download->setChecked(s.value("auto_download", false).toBool());
+  ui_->hide_listened->setChecked(s.value("hide_listened", false).toBool());
+  ui_->delete_after->setValue(s.value("delete_after", 0).toInt() / kSecsPerDay);
+  ui_->show_episodes->setValue(s.value("show_episodes", 0).toInt());
+  ui_->username->setText(s.value("gpodder_username").toString());
+  ui_->device_name->setText(
+    s.value("gpodder_device_name", GPodderSync::DefaultDeviceName())
+      .toString());
+
+  if (dialog()->app()->gpodder_sync()->is_logged_in()) {
+    ui_->login_state->SetLoggedIn(LoginStateWidget::LoggedIn,
+      ui_->username->text());
+  }
+  else {
+    ui_->login_state->SetLoggedIn(LoginStateWidget::LoggedOut);
+  }
+}
+
+void PodcastSettingsPage::Save() {
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  s.setValue("update_interval_secs", ui_->check_interval->itemData(ui_->check_interval->currentIndex()));
+  s.setValue("download_dir",
+    QDir::fromNativeSeparators(ui_->download_dir->text()));
+  s.setValue("auto_download", ui_->auto_download->isChecked());
+  s.setValue("hide_listened", ui_->hide_listened->isChecked());
+  s.setValue("delete_after", ui_->delete_after->value() * kSecsPerDay);
+  s.setValue("show_episodes", ui_->show_episodes->value());
+  s.setValue("gpodder_device_name", ui_->device_name->text());
+}
+
+void PodcastSettingsPage::LoginClicked() {
+  ui_->login_state->SetLoggedIn(LoginStateWidget::LoginInProgress);
+
+  dialog()->app()->gpodder_sync()->Login(
+    ui_->username->text(), ui_->password->text(), ui_->device_name->text());
+}
+
+void PodcastSettingsPage::GpodderLoginSuccess() {
+  ui_->login_state->SetLoggedIn(LoginStateWidget::LoggedIn,
+    ui_->username->text());
+  ui_->login_state->SetAccountTypeVisible(false);
+}
+
+void PodcastSettingsPage::GpodderLoginFailure(const QString& error) {
+  ui_->login_state->SetLoggedIn(LoginStateWidget::LoggedOut,
+    ui_->username->text());
+  ui_->login_state->SetAccountTypeVisible(true);
+  ui_->login_state->SetAccountTypeText(tr("Login failed") + ": " + error);
+}
+
+void PodcastSettingsPage::LogoutClicked() {
+  ui_->login_state->SetLoggedIn(LoginStateWidget::LoggedOut);
+  ui_->password->clear();
+  dialog()->app()->gpodder_sync()->Logout();
+}
+
+void PodcastSettingsPage::DownloadDirBrowse() {
+  QString directory = QFileDialog::getExistingDirectory(
+    this, tr("Choose podcast download directory"), ui_->download_dir->text());
+  if (directory.isEmpty()) return;
+
+  ui_->download_dir->setText(QDir::toNativeSeparators(directory));
+}

src/settings/podcastsettingspage.h

@@ -0,0 +1,52 @@
+/* This file is part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+   Copyright 2014, John Maguire <john.maguire@gmail.com>
+   Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PODCASTSETTINGSPAGE_H
+#define PODCASTSETTINGSPAGE_H
+
+#include "settingspage.h"
+
+class Ui_PodcastSettingsPage;
+
+class PodcastSettingsPage : public SettingsPage {
+  Q_OBJECT
+
+ public:
+  explicit PodcastSettingsPage(SettingsDialog* dialog);
+  ~PodcastSettingsPage();
+
+  static const char* kSettingsGroup;
+
+  void Load();
+  void Save();
+
+ private slots:
+  void LoginClicked();
+  void LogoutClicked();
+
+  void GpodderLoginSuccess();
+  void GpodderLoginFailure(const QString& error);
+
+  void DownloadDirBrowse();
+
+ private:
+  Ui_PodcastSettingsPage* ui_;
+};
+
+#endif  // PODCASTSETTINGSPAGE_H

src/settings/podcastsettingspage.ui

@@ -0,0 +1,290 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PodcastSettingsPage</class>
+ <widget class="QWidget" name="PodcastSettingsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>616</width>
+    <height>656</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Podcasts</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
+      <string>Updating</string>
+     </property>
+     <layout class="QFormLayout" name="formLayout">
+      <item row="0" column="0">
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>Check for new episodes</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QComboBox" name="check_interval">
+        <item>
+         <property name="text">
+          <string>Manually</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 10 minutes</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 20 minutes</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 30 minutes</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every hour</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 2 hours</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 6 hours</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Every 12 hours</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_4">
+        <property name="text">
+         <string>Download episodes to</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="0" colspan="2">
+       <widget class="QCheckBox" name="auto_download">
+        <property name="text">
+         <string>Download new episodes automatically</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QLineEdit" name="download_dir"/>
+        </item>
+        <item>
+         <widget class="QPushButton" name="download_dir_browse">
+          <property name="text">
+           <string>Browse...</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Cleaning up</string>
+     </property>
+     <layout class="QFormLayout" name="formLayout_2">
+      <property name="fieldGrowthPolicy">
+       <enum>QFormLayout::AllNonFixedFieldsGrow</enum>
+      </property>
+      <item row="0" column="0">
+       <widget class="QLabel" name="label_2">
+        <property name="text">
+         <string>Delete played episodes</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QSpinBox" name="delete_after">
+        <property name="specialValueText">
+         <string>Manually</string>
+        </property>
+        <property name="suffix">
+         <string> days</string>
+        </property>
+        <property name="prefix">
+         <string>After </string>
+        </property>
+        <property name="maximum">
+         <number>30</number>
+        </property>
+        <property name="empty_text" stdset="0">
+         <string/>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_4">
+     <property name="title">
+      <string>Appearance</string>
+     </property>
+     <layout class="QFormLayout" name="formLayout_4">
+      <property name="fieldGrowthPolicy">
+       <enum>QFormLayout::AllNonFixedFieldsGrow</enum>
+      </property>
+      <item row="0" column="0">
+       <widget class="QCheckBox" name="hide_listened">
+        <property name="text">
+         <string>Don't show listened episodes</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QSpinBox" name="show_episodes">
+        <property name="specialValueText">
+         <string>All</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_8">
+        <property name="text">
+         <string>Number of episodes to show</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_3">
+     <property name="title">
+      <string>gpodder.net</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Clementine can synchronize your subscription list with your other computers and podcast applications.  &lt;a href=&quot;https://gpodder.net/register/&quot;&gt;Create an account&lt;/a&gt;.</string>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+        <property name="openExternalLinks">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="LoginStateWidget" name="login_state" native="true"/>
+      </item>
+      <item>
+       <widget class="QWidget" name="login_group" native="true">
+        <layout class="QFormLayout" name="formLayout_3">
+         <property name="margin">
+          <number>0</number>
+         </property>
+         <item row="0" column="0">
+          <widget class="QLabel" name="label_5">
+           <property name="text">
+            <string>Username</string>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="1">
+          <layout class="QHBoxLayout" name="horizontalLayout">
+           <item>
+            <widget class="QLineEdit" name="username"/>
+           </item>
+           <item>
+            <widget class="QPushButton" name="login">
+             <property name="text">
+              <string>Sign in</string>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </item>
+         <item row="1" column="0">
+          <widget class="QLabel" name="label_6">
+           <property name="text">
+            <string>Password</string>
+           </property>
+          </widget>
+         </item>
+         <item row="1" column="1">
+          <widget class="QLineEdit" name="password">
+           <property name="echoMode">
+            <enum>QLineEdit::Password</enum>
+           </property>
+          </widget>
+         </item>
+         <item row="2" column="0">
+          <widget class="QLabel" name="label_7">
+           <property name="text">
+            <string>Device name</string>
+           </property>
+          </widget>
+         </item>
+         <item row="2" column="1">
+          <widget class="QLineEdit" name="device_name"/>
+         </item>
+        </layout>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>0</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>LoginStateWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/loginstatewidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>check_interval</tabstop>
+  <tabstop>download_dir</tabstop>
+  <tabstop>download_dir_browse</tabstop>
+  <tabstop>auto_download</tabstop>
+  <tabstop>delete_after</tabstop>
+  <tabstop>username</tabstop>
+  <tabstop>password</tabstop>
+  <tabstop>device_name</tabstop>
+  <tabstop>login</tabstop>
+ </tabstops>
+ <connections/>
+</ui>

src/widgets/widgetfadehelper.cpp

@@ -0,0 +1,168 @@
+/* This file is part of Clementine.
+   Copyright 2010, David Sansome <me@davidsansome.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "widgetfadehelper.h"
+
+#include <QPainter>
+#include <QResizeEvent>
+#include <QTimeLine>
+#include <QtDebug>
+
+#include "core/qt_blurimage.h"
+
+const int WidgetFadeHelper::kLoadingPadding = 9;
+const int WidgetFadeHelper::kLoadingBorderRadius = 10;
+
+WidgetFadeHelper::WidgetFadeHelper(QWidget* parent, const int msec)
+    : QWidget(parent),
+      parent_(parent),
+      blur_timeline_(new QTimeLine(msec, this)),
+      fade_timeline_(new QTimeLine(msec, this)) {
+  parent->installEventFilter(this);
+
+  connect(blur_timeline_, SIGNAL(valueChanged(qreal)), SLOT(update()));
+  connect(fade_timeline_, SIGNAL(valueChanged(qreal)), SLOT(update()));
+  connect(fade_timeline_, SIGNAL(finished()), SLOT(FadeFinished()));
+
+  hide();
+}
+
+bool WidgetFadeHelper::eventFilter(QObject* obj, QEvent* event) {
+  // We're only interested in our parent's resize events
+  if (obj != parent_ || event->type() != QEvent::Resize) return false;
+
+  // Don't care if we're hidden
+  if (!isVisible()) return false;
+
+  QResizeEvent* re = static_cast<QResizeEvent*>(event);
+  if (re->oldSize() == re->size()) {
+    // Ignore phoney resize events
+    return false;
+  }
+
+  // Get a new capture of the parent
+  hide();
+  CaptureParent();
+  show();
+  return false;
+}
+
+void WidgetFadeHelper::StartBlur() {
+  CaptureParent();
+
+  // Cover the parent
+  raise();
+  show();
+
+  // Start the timeline
+  blur_timeline_->stop();
+  blur_timeline_->start();
+
+  setAttribute(Qt::WA_TransparentForMouseEvents, false);
+}
+
+void WidgetFadeHelper::CaptureParent() {
+  // Take a "screenshot" of the window
+  original_pixmap_ = parent_->grab();
+  QImage original_image = original_pixmap_.toImage();
+
+  // Blur it
+  QImage blurred(original_image.size(), QImage::Format_ARGB32_Premultiplied);
+  blurred.fill(Qt::transparent);
+
+  QPainter blur_painter(&blurred);
+  blur_painter.save();
+  qt_blurImage(&blur_painter, original_image, 10.0, true, false);
+  blur_painter.restore();
+
+  // Draw some loading text over the top
+  QFont loading_font(font());
+  loading_font.setBold(true);
+  QFontMetrics loading_font_metrics(loading_font);
+
+  const QString loading_text = tr("Loading...");
+  const QSize loading_size(
+      kLoadingPadding * 2 + loading_font_metrics.width(loading_text),
+      kLoadingPadding * 2 + loading_font_metrics.height());
+  const QRect loading_rect((blurred.width() - loading_size.width()) / 2, 100,
+                           loading_size.width(), loading_size.height());
+
+  blur_painter.setRenderHint(QPainter::Antialiasing);
+  blur_painter.setRenderHint(QPainter::HighQualityAntialiasing);
+
+  blur_painter.translate(0.5, 0.5);
+  blur_painter.setPen(QColor(200, 200, 200, 255));
+  blur_painter.setBrush(QColor(200, 200, 200, 192));
+  blur_painter.drawRoundedRect(loading_rect, kLoadingBorderRadius,
+                               kLoadingBorderRadius);
+
+  blur_painter.setPen(palette().brush(QPalette::Text).color());
+  blur_painter.setFont(loading_font);
+  blur_painter.drawText(loading_rect.translated(-1, -1), Qt::AlignCenter,
+                        loading_text);
+  blur_painter.translate(-0.5, -0.5);
+
+  blur_painter.end();
+
+  blurred_pixmap_ = QPixmap::fromImage(blurred);
+
+  resize(parent_->size());
+}
+
+void WidgetFadeHelper::StartFade() {
+
+  if (blur_timeline_->state() == QTimeLine::Running) {
+    // Blur timeline is still running, so we need render the current state
+    // into a new pixmap.
+    QPixmap pixmap(original_pixmap_);
+    QPainter painter(&pixmap);
+    painter.setOpacity(blur_timeline_->currentValue());
+    painter.drawPixmap(0, 0, blurred_pixmap_);
+    painter.end();
+    blurred_pixmap_ = pixmap;
+  }
+  blur_timeline_->stop();
+  original_pixmap_ = QPixmap();
+
+  // Start the timeline
+  fade_timeline_->stop();
+  fade_timeline_->start();
+
+  setAttribute(Qt::WA_TransparentForMouseEvents, true);
+
+}
+
+void WidgetFadeHelper::paintEvent(QPaintEvent*) {
+  QPainter p(this);
+
+  if (fade_timeline_->state() != QTimeLine::Running) {
+    // We're fading in the blur
+    p.drawPixmap(0, 0, original_pixmap_);
+    p.setOpacity(blur_timeline_->currentValue());
+  } else {
+    // Fading out the blur into the new image
+    p.setOpacity(1.0 - fade_timeline_->currentValue());
+  }
+
+  p.drawPixmap(0, 0, blurred_pixmap_);
+}
+
+void WidgetFadeHelper::FadeFinished() {
+  hide();
+  original_pixmap_ = QPixmap();
+  blurred_pixmap_ = QPixmap();
+}

src/widgets/widgetfadehelper.h

@@ -0,0 +1,57 @@
+/* This file is part of Clementine.
+   Copyright 2010, David Sansome <me@davidsansome.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef WIDGETFADEHELPER_H
+#define WIDGETFADEHELPER_H
+
+#include <QWidget>
+
+class QTimeLine;
+
+class WidgetFadeHelper : public QWidget {
+  Q_OBJECT
+
+ public:
+  WidgetFadeHelper(QWidget* parent, const int msec = 500);
+
+ public slots:
+  void StartBlur();
+  void StartFade();
+
+ protected:
+  void paintEvent(QPaintEvent*);
+  bool eventFilter(QObject* obj, QEvent* event);
+
+ private slots:
+  void FadeFinished();
+
+ private:
+  void CaptureParent();
+
+ private:
+  static const int kLoadingPadding;
+  static const int kLoadingBorderRadius;
+
+  QWidget* parent_;
+  QTimeLine* blur_timeline_;
+  QTimeLine* fade_timeline_;
+
+  QPixmap original_pixmap_;
+  QPixmap blurred_pixmap_;
+};
+
+#endif  // WIDGETFADEHELPER_H