Add "Smart Playlists" for subsonic

Notes:
- These playlists allow access to the subsonic feature of pulling new, frequently played, and so on albums.
- See: http://www.subsonic.org/pages/api.jsp#getAlbumList for the subsonic description
- The subsonic api is inherently album oriented.  Therefore at the moment the "count" argument for GenerateMore is used as the number of albums to pull, which hopefully isn't a problem.
- Could be made more efficient by multi-threading the fetch of the songs for each album

src/CMakeLists.txt

@@ -197,6 +197,7 @@ set(SOURCES
   internet/subsonic/subsonicservice.cpp
   internet/subsonic/subsonicsettingspage.cpp
   internet/subsonic/subsonicurlhandler.cpp
+  internet/subsonic/subsonicdynamicplaylist.cpp
 
   library/groupbydialog.cpp
   library/library.cpp
@@ -499,6 +500,7 @@ set(HEADERS
   internet/subsonic/subsonicservice.h
   internet/subsonic/subsonicsettingspage.h
   internet/subsonic/subsonicurlhandler.h
+  internet/subsonic/subsonicdynamicplaylist.h
 
   library/groupbydialog.h
   library/library.h

src/internet/subsonic/subsonicdynamicplaylist.cpp

@@ -0,0 +1,259 @@
+/* This file is part of Clementine.
+   Copyright 2015, Nick Lanham <nick@afternight.org>
+
+   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 "subsonicdynamicplaylist.h"
+
+#include <QEventLoop>
+#include <QFileInfo>
+#include <QSslConfiguration>
+#include <QXmlStreamReader>
+
+#include "core/application.h"
+#include "core/logging.h"
+#include "core/network.h"
+#include "core/taskmanager.h"
+#include "core/timeconstants.h"
+#include "internet/core/internetplaylistitem.h"
+
+SubsonicDynamicPlaylist::SubsonicDynamicPlaylist()
+  : stat_(QueryStat_Newest),
+    offset_(0) {}
+
+SubsonicDynamicPlaylist::SubsonicDynamicPlaylist(const QString& name,
+                                                 QueryStat stat)
+  : stat_(stat),
+    offset_(0) {
+  set_name(name);
+}
+
+void SubsonicDynamicPlaylist::Load(const QByteArray& data) {
+  QDataStream s(data);
+  s >> *this;
+}
+
+void SubsonicDynamicPlaylist::Load(QueryStat stat) {
+  stat_ = stat;
+}
+
+QByteArray SubsonicDynamicPlaylist::Save() const {
+  QByteArray ret;
+  QDataStream s(&ret, QIODevice::WriteOnly);
+  s << *this;
+  return ret;
+}
+
+// copied from SubsonicService
+QNetworkReply* SubsonicDynamicPlaylist::Send(QNetworkAccessManager& network, const QUrl& url, const bool usesslv3) {
+  QNetworkRequest request(url);
+  // Don't try and check the authenticity of the SSL certificate - it'll almost
+  // certainly be self-signed.
+  QSslConfiguration sslconfig = QSslConfiguration::defaultConfiguration();
+  sslconfig.setPeerVerifyMode(QSslSocket::VerifyNone);
+  if (usesslv3) {
+    sslconfig.setProtocol(QSsl::SslV3);
+  }
+  request.setSslConfiguration(sslconfig);
+  QNetworkReply* reply = network.get(request);
+  return reply;
+}
+
+PlaylistItemList SubsonicDynamicPlaylist::Generate() { return GenerateMore(10); }
+
+PlaylistItemList SubsonicDynamicPlaylist::GenerateMore(int count) {
+  SubsonicService* service = InternetModel::Service<SubsonicService>();
+  int task_id = service->app_->task_manager()->StartTask(tr("Fetching Playlist Items"));
+  QUrl url = service->BuildRequestUrl("GetAlbumList");
+  QNetworkAccessManager network;
+
+  switch (stat_) {
+    case QueryStat::QueryStat_Newest:
+      url.addQueryItem("type","newest");
+      break;
+    case QueryStat::QueryStat_Highest:
+      url.addQueryItem("type","highest");
+      break;
+    case QueryStat::QueryStat_Frequent:
+      url.addQueryItem("type","frequent");
+      break;
+    case QueryStat::QueryStat_Recent:
+      url.addQueryItem("type","recent");
+      break;
+  case QueryStat::QueryStat_Starred:
+      url.addQueryItem("type","starred");
+      break;
+    case QueryStat::QueryStat_Random:
+      url.addQueryItem("type","random");
+      break;
+  }
+
+  if (count > 500) count = 500;  // 500 limit per subsonic api
+  if (count != 10) { // 10 is default
+    url.addQueryItem("size",QString::number(count));
+  }
+
+  if (offset_ != 0) { // 0 is default
+    url.addQueryItem("offset",QString::number(offset_));
+  }
+
+  PlaylistItemList items;
+
+  QNetworkReply* reply = Send(network,url,service->usesslv3_);
+
+  // wait for reply
+  {
+    QEventLoop loop;
+    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
+    loop.exec();
+  }
+
+  if (reply->error() != QNetworkReply::NoError) {
+    qLog(Warning) << "HTTP error returned from Subsonic:" << reply->errorString()
+                  << ", url:" << url.toString();
+    service->app_->task_manager()->SetTaskFinished(task_id);
+    return items; // empty
+  }
+
+  reply->deleteLater();
+  QXmlStreamReader reader(reply);
+  reader.readNextStartElement();
+  if (reader.name() != "subsonic-response") {
+    qLog(Warning) << "Not a subsonic-response, aboring playlist fetch";
+    service->app_->task_manager()->SetTaskFinished(task_id);
+    return items;
+  }
+
+  if (reader.attributes().value("status") != "ok") {
+    reader.readNextStartElement();
+    int error = reader.attributes().value("code").toString().toInt();
+    qLog(Warning) << "An error occured fetching data.  Code: "<<error<<" Message: "<<reader.attributes().value("message").toString();
+  }
+
+  reader.readNextStartElement();
+  if (reader.name() != "albumList") {
+    qLog(Warning) << "albumList tag expected.  Aboring playlist fetch";
+    service->app_->task_manager()->SetTaskFinished(task_id);
+    return items;
+  }
+
+  while (reader.readNextStartElement()) {
+    if (reader.name() != "album") {
+      qLog(Warning) << "album tag expected. Aboring playlist fetch";
+      service->app_->task_manager()->SetTaskFinished(task_id);
+      return items;
+    }
+
+    qLog(Debug) << "Getting album: "<<reader.attributes().value("album").toString();
+    GetAlbum(service,items,reader.attributes().value("id").toString(),network,service->usesslv3_);
+
+    reader.skipCurrentElement();
+  }
+  offset_+=count;
+  service->app_->task_manager()->SetTaskFinished(task_id);
+  return items;
+}
+
+void SubsonicDynamicPlaylist::GetAlbum(SubsonicService* service, PlaylistItemList& list, QString id, QNetworkAccessManager& network, const bool usesslv3) {
+  QUrl url = service->BuildRequestUrl("getAlbum");
+  url.addQueryItem("id", id);
+  QNetworkReply* reply = Send(network, url, usesslv3);
+
+  { // wait for reply
+    QEventLoop loop;
+    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
+    loop.exec();
+  }
+
+  if (reply->error() != QNetworkReply::NoError) {
+    qLog(Warning) << "HTTP error returned from Subsonic:" << reply->errorString()
+                  << ", url:" << url.toString();
+    return;
+  }
+
+    QXmlStreamReader reader(reply);
+  reader.readNextStartElement();
+
+  if (reader.name() != "subsonic-response") {
+    qLog(Warning) << "Not a subsonic-response. Aborting playlist fetch.";
+    return;
+  }
+
+  if (reader.attributes().value("status") != "ok") {
+    qLog(Warning) << "Status not okay. Aborting playlist fetch.";
+    return;
+  }
+
+  // Read album information
+  reader.readNextStartElement();
+  if (reader.name() != "album") {
+    qLog(Warning) << "album tag expected. Aborting playlist fetch.";
+    return;
+  }
+
+  QString album_artist = reader.attributes().value("artist").toString();
+
+  // Read song information
+  while (reader.readNextStartElement()) {
+    if (reader.name() != "song") {
+      qLog(Warning) << "song tag expected. Aborting playlist fetch.";
+      return;
+    }
+
+    Song song;
+    QString id = reader.attributes().value("id").toString();
+    song.set_title(reader.attributes().value("title").toString());
+    song.set_album(reader.attributes().value("album").toString());
+    song.set_track(reader.attributes().value("track").toString().toInt());
+    song.set_disc(reader.attributes().value("discNumber").toString().toInt());
+    song.set_artist(reader.attributes().value("artist").toString());
+    song.set_albumartist(album_artist);
+    song.set_bitrate(reader.attributes().value("bitRate").toString().toInt());
+    song.set_year(reader.attributes().value("year").toString().toInt());
+    song.set_genre(reader.attributes().value("genre").toString());
+    qint64 length = reader.attributes().value("duration").toString().toInt();
+    length *= kNsecPerSec;
+    song.set_length_nanosec(length);
+    QUrl url = QUrl(QString("subsonic://%1").arg(id));
+    song.set_url(url);
+    song.set_filesize(reader.attributes().value("size").toString().toInt());
+    QFileInfo fi(reader.attributes().value("path").toString());
+    song.set_basefilename(fi.fileName());
+    // We need to set these to satisfy the database constraints
+    song.set_directory_id(0);
+    song.set_mtime(0);
+    song.set_ctime(0);
+
+
+    list << std::shared_ptr<PlaylistItem>(
+      new InternetPlaylistItem(service,song));
+
+    reader.skipCurrentElement();
+  }
+}
+
+QDataStream& operator<<(QDataStream& s, const SubsonicDynamicPlaylist& p) {
+  s << quint8(p.stat_);
+  return s;
+}
+
+QDataStream& operator>>(QDataStream& s, SubsonicDynamicPlaylist& p) {
+  quint8 stat;
+  s >> stat;
+  p.stat_ = SubsonicDynamicPlaylist::QueryStat(stat);
+  return s;
+}
+
+

src/internet/subsonic/subsonicdynamicplaylist.h

@@ -0,0 +1,75 @@
+/* This file is part of Clementine.
+   Copyright 2015, Nick Lanham <nick@afternight.org>
+
+   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 INTERNET_SUBSONIC_SUBSONICDYNAMICPLAYLIST_H_
+#define INTERNET_SUBSONIC_SUBSONICDYNAMICPLAYLIST_H_
+
+#include "smartplaylists/generator.h"
+
+#include <QNetworkAccessManager>
+
+class SubsonicService;
+
+class SubsonicDynamicPlaylist : public smart_playlists::Generator {
+  Q_OBJECT
+  friend QDataStream& operator<<(QDataStream& s,
+                                 const SubsonicDynamicPlaylist& p);
+  friend QDataStream& operator>>(QDataStream& s, SubsonicDynamicPlaylist& p);
+
+ public:
+
+  // things that subsonic can return to us, persisted so only add at end
+  enum QueryStat {
+    QueryStat_Newest = 0,
+    QueryStat_Highest = 1,
+    QueryStat_Frequent = 2,
+    QueryStat_Recent = 3,
+    QueryStat_Starred = 4,
+    QueryStat_Random =5,
+  };
+
+  SubsonicDynamicPlaylist();
+  SubsonicDynamicPlaylist(const QString& name, QueryStat stat);
+
+  QString type() const { return "Subsonic"; }
+
+  void Load(const QByteArray& data);
+  void Load(QueryStat stat);
+  QByteArray Save() const;
+
+  PlaylistItemList Generate();
+
+  bool is_dynamic() const { return true; }
+  PlaylistItemList GenerateMore(int count);
+
+ private:
+  void GetAlbum(SubsonicService* service, PlaylistItemList& list, QString id, QNetworkAccessManager& network, const bool usesslv3);
+  // need our own one since we run in a different thread from service
+  QNetworkReply* Send(QNetworkAccessManager& network, const QUrl& url, const bool usesslv3);
+
+ private:
+  QueryStat stat_;
+  int offset_;
+  SubsonicService* service_;
+};
+
+#include "subsonicservice.h"
+
+QDataStream& operator<<(QDataStream& s, const SubsonicDynamicPlaylist& p);
+QDataStream& operator>>(QDataStream& s, SubsonicDynamicPlaylist& p);
+
+#endif // INTERNET_SUBSONIC_SUBSONICDYNAMICPLAYLIST_H_

src/internet/subsonic/subsonicservice.cpp

@@ -43,8 +43,11 @@
 #include "globalsearch/librarysearchprovider.h"
 #include "internet/core/internetmodel.h"
 #include "internet/subsonic/subsonicurlhandler.h"
+#include "internet/subsonic/subsonicdynamicplaylist.h"
 #include "library/librarybackend.h"
 #include "library/libraryfilterwidget.h"
+#include "smartplaylists/generator.h"
+#include "smartplaylists/querygenerator.h"
 #include "ui/iconloader.h"
 
 const char* SubsonicService::kServiceName = "Subsonic";
@@ -83,9 +86,34 @@ SubsonicService::SubsonicService(Application* app, InternetModel* parent)
   connect(library_backend_, SIGNAL(TotalSongCountUpdated(int)),
           SLOT(UpdateTotalSongCount(int)));
 
+  using smart_playlists::Generator;
+  using smart_playlists::GeneratorPtr;
+
   library_model_ = new LibraryModel(library_backend_, app_, this);
   library_model_->set_show_various_artists(false);
-  library_model_->set_show_smart_playlists(false);
+  library_model_->set_show_smart_playlists(true);
+  library_model_->set_default_smart_playlists(
+    LibraryModel::DefaultGenerators()
+    << (LibraryModel::GeneratorList()
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Newest"),
+                          SubsonicDynamicPlaylist::QueryStat_Newest))
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Random"),
+                          SubsonicDynamicPlaylist::QueryStat_Random))
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Frequently Played"),
+                          SubsonicDynamicPlaylist::QueryStat_Frequent))
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Top Rated"),
+                          SubsonicDynamicPlaylist::QueryStat_Highest))
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Recently Played"),
+                          SubsonicDynamicPlaylist::QueryStat_Recent))
+        << GeneratorPtr(new SubsonicDynamicPlaylist(
+                          tr("Starred"),
+                          SubsonicDynamicPlaylist::QueryStat_Starred))
+      ));
 
   library_filter_ = new LibraryFilterWidget(0);
   library_filter_->SetSettingsGroup(kSettingsGroup);

src/internet/subsonic/subsonicservice.h

@@ -26,6 +26,7 @@
 
 #include "internet/core/internetmodel.h"
 #include "internet/core/internetservice.h"
+#include "internet/subsonic/subsonicdynamicplaylist.h"
 
 class QNetworkAccessManager;
 class QNetworkReply;
@@ -109,6 +110,8 @@ class SubsonicService : public InternetService {
   // boilerplate.
   QNetworkReply* Send(const QUrl& url);
 
+  friend PlaylistItemList SubsonicDynamicPlaylist::GenerateMore(int);
+
   static const char* kServiceName;
   static const char* kSettingsGroup;
   static const char* kApiVersion;

src/smartplaylists/generator.cpp

@@ -19,6 +19,7 @@
 #include "querygenerator.h"
 #include "core/logging.h"
 #include "internet/jamendo/jamendodynamicplaylist.h"
+#include "internet/subsonic/subsonicdynamicplaylist.h"
 
 #include <QSettings>
 
@@ -35,6 +36,9 @@ GeneratorPtr Generator::Create(const QString& type) {
     return GeneratorPtr(new QueryGenerator);
   else if (type == "Jamendo")
     return GeneratorPtr(new JamendoDynamicPlaylist);
+  else if (type == "Subsonic") {
+    return GeneratorPtr(new SubsonicDynamicPlaylist);
+  }
 
   qLog(Warning) << "Invalid playlist generator type:" << type;
   return GeneratorPtr();