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strawberry-audio-player-win.../src/covermanager/discogscoverprovider.cpp

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/*
* Strawberry Music Player
* This file was part of Clementine.
* Copyright 2012, Martin Björklund <mbj4668@gmail.com>
* Copyright 2016-2021, 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 "config.h"
#include <memory>
#include <algorithm>
#include <type_traits>
#include <QtGlobal>
#include <QObject>
#include <QByteArray>
#include <QList>
#include <QPair>
#include <QSet>
#include <QMap>
#include <QQueue>
#include <QVariant>
#include <QString>
#include <QStringList>
#include <QUrl>
#include <QUrlQuery>
#include <QTimer>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>
#include <QJsonArray>
#include <QtDebug>
#include "core/application.h"
#include "core/logging.h"
#include "core/networkaccessmanager.h"
#include "core/utilities.h"
#include "albumcoverfetcher.h"
#include "jsoncoverprovider.h"
#include "discogscoverprovider.h"
const char *DiscogsCoverProvider::kUrlSearch = "https://api.discogs.com/database/search";
const char *DiscogsCoverProvider::kAccessKeyB64 = "dGh6ZnljUGJlZ1NEeXBuSFFxSVk=";
const char *DiscogsCoverProvider::kSecretKeyB64 = "ZkFIcmlaSER4aHhRSlF2U3d0bm5ZVmdxeXFLWUl0UXI=";
const int DiscogsCoverProvider::kRequestsDelay = 1000;
DiscogsCoverProvider::DiscogsCoverProvider(Application *app, NetworkAccessManager *network, QObject *parent)
: JsonCoverProvider("Discogs", false, false, 0.0, false, false, app, network, parent),
timer_flush_requests_(new QTimer(this)) {
timer_flush_requests_->setInterval(kRequestsDelay);
timer_flush_requests_->setSingleShot(false);
QObject::connect(timer_flush_requests_, &QTimer::timeout, this, &DiscogsCoverProvider::FlushRequests);
}
DiscogsCoverProvider::~DiscogsCoverProvider() {
while (!replies_.isEmpty()) {
QNetworkReply *reply = replies_.takeFirst();
QObject::disconnect(reply, nullptr, this, nullptr);
reply->abort();
reply->deleteLater();
}
timer_flush_requests_->stop();
queue_search_requests_.clear();
queue_release_requests_.clear();
requests_search_.clear();
}
bool DiscogsCoverProvider::StartSearch(const QString &artist, const QString &album, const QString &title, const int id) {
Q_UNUSED(title);
if (artist.isEmpty() || album.isEmpty()) return false;
std::shared_ptr<DiscogsCoverSearchContext> search = std::make_shared<DiscogsCoverSearchContext>(id, artist, album);
requests_search_.insert(search->id, search);
queue_search_requests_.enqueue(search);
if (!timer_flush_requests_->isActive()) {
timer_flush_requests_->start();
}
return true;
}
void DiscogsCoverProvider::CancelSearch(const int id) {
if (requests_search_.contains(id)) requests_search_.remove(id);
}
void DiscogsCoverProvider::FlushRequests() {
if (!queue_release_requests_.isEmpty()) {
SendReleaseRequest(queue_release_requests_.dequeue());
return;
}
if (!queue_search_requests_.isEmpty()) {
SendSearchRequest(queue_search_requests_.dequeue());
return;
}
timer_flush_requests_->stop();
}
void DiscogsCoverProvider::SendSearchRequest(std::shared_ptr<DiscogsCoverSearchContext> search) {
ParamList params = ParamList() << Param("format", "album")
<< Param("artist", search->artist.toLower())
<< Param("release_title", search->album.toLower());
switch (search->type) {
case DiscogsCoverType_Master:
params << Param("type", "master");
break;
case DiscogsCoverType_Release:
params << Param("type", "release");
break;
}
QNetworkReply *reply = CreateRequest(QUrl(kUrlSearch), params);
QObject::connect(reply, &QNetworkReply::finished, this, [this, reply, search]() { HandleSearchReply(reply, search->id); });
}
QNetworkReply *DiscogsCoverProvider::CreateRequest(QUrl url, const ParamList &params_provided) {
ParamList params = ParamList() << Param("key", QByteArray::fromBase64(kAccessKeyB64))
<< Param("secret", QByteArray::fromBase64(kSecretKeyB64))
<< params_provided;
QUrlQuery url_query;
QStringList query_items;
// Encode the arguments
typedef QPair<QByteArray, QByteArray> EncodedParam;
for (const Param &param : params) {
EncodedParam encoded_param(QUrl::toPercentEncoding(param.first), QUrl::toPercentEncoding(param.second));
query_items << QString(encoded_param.first + "=" + encoded_param.second);
url_query.addQueryItem(encoded_param.first, encoded_param.second);
}
url.setQuery(url_query);
// Sign the request
const QByteArray data_to_sign = QString("GET\n%1\n%2\n%3").arg(url.host(), url.path(), query_items.join("&")).toUtf8();
const QByteArray signature(Utilities::HmacSha256(QByteArray::fromBase64(kSecretKeyB64), data_to_sign));
// Add the signature to the request
url_query.addQueryItem("Signature", QUrl::toPercentEncoding(signature.toBase64()));
QNetworkRequest req(url);
#if QT_VERSION >= QT_VERSION_CHECK(5, 9, 0)
req.setAttribute(QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::NoLessSafeRedirectPolicy);
#else
req.setAttribute(QNetworkRequest::FollowRedirectsAttribute, true);
#endif
QNetworkReply *reply = network_->get(req);
replies_ << reply;
qLog(Debug) << "Discogs: Sending request" << url;
return reply;
}
QByteArray DiscogsCoverProvider::GetReplyData(QNetworkReply *reply) {
QByteArray data;
if (reply->error() == QNetworkReply::NoError && reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() == 200) {
data = reply->readAll();
}
else {
if (reply->error() != QNetworkReply::NoError && reply->error() < 200) {
// This is a network error, there is nothing more to do.
QString error = QString("%1 (%2)").arg(reply->errorString()).arg(reply->error());
Error(error);
}
else {
// See if there is Json data containing "message" - then use that instead.
data = reply->readAll();
QString error;
QJsonParseError json_error;
QJsonDocument json_doc = QJsonDocument::fromJson(data, &json_error);
if (json_error.error == QJsonParseError::NoError && !json_doc.isEmpty() && json_doc.isObject()) {
QJsonObject json_obj = json_doc.object();
if (json_obj.contains("message")) {
error = json_obj["message"].toString();
}
}
if (error.isEmpty()) {
if (reply->error() != QNetworkReply::NoError) {
error = QString("%1 (%2)").arg(reply->errorString()).arg(reply->error());
}
else {
error = QString("Received HTTP code %1").arg(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt());
}
}
Error(error);
}
return QByteArray();
}
return data;
}
void DiscogsCoverProvider::HandleSearchReply(QNetworkReply *reply, const quint64 id) {
if (!replies_.contains(reply)) return;
replies_.removeAll(reply);
QObject::disconnect(reply, nullptr, this, nullptr);
reply->deleteLater();
if (!requests_search_.contains(id)) return;
std::shared_ptr<DiscogsCoverSearchContext> search = requests_search_.value(id);
QByteArray data = GetReplyData(reply);
if (data.isEmpty()) {
EndSearch(search);
return;
}
QJsonObject json_obj = ExtractJsonObj(data);
if (json_obj.isEmpty()) {
EndSearch(search);
return;
}
QJsonValue value_results;
if (json_obj.contains("results")) {
value_results = json_obj["results"];
}
else if (json_obj.contains("message")) {
QString message = json_obj["message"].toString();
Error(QString("%1").arg(message));
EndSearch(search);
return;
}
else {
Error("Json object is missing results.", json_obj);
EndSearch(search);
return;
}
if (!value_results.isArray()) {
Error("Missing results array.", value_results);
EndSearch(search);
return;
}
QJsonArray array_results = value_results.toArray();
for (QJsonValueRef value_result : array_results) {
if (!value_result.isObject()) {
Error("Invalid Json reply, results value is not a object.");
continue;
}
QJsonObject obj_result = value_result.toObject();
if (!obj_result.contains("id") || !obj_result.contains("title") || !obj_result.contains("resource_url")) {
Error("Invalid Json reply, results value object is missing ID, title or resource_url.", obj_result);
continue;
}
quint64 release_id = obj_result["id"].toInt();
QUrl resource_url(obj_result["resource_url"].toString());
QString title = obj_result["title"].toString();
if (title.contains(" - ")) {
QStringList title_splitted = title.split(" - ");
if (title_splitted.count() == 2) {
QString artist = title_splitted.first();
title = title_splitted.last();
if (artist.compare(search->artist, Qt::CaseInsensitive) != 0 && title.compare(search->album, Qt::CaseInsensitive) != 0) continue;
}
}
if (!resource_url.isValid()) continue;
if (search->requests_release_.contains(release_id)) {
continue;
}
StartReleaseRequest(search, release_id, resource_url);
}
if (search->requests_release_.count() == 0) {
if (search->type == DiscogsCoverType_Master) {
search->type = DiscogsCoverType_Release;
queue_search_requests_.enqueue(search);
}
else {
EndSearch(search);
}
}
}
void DiscogsCoverProvider::StartReleaseRequest(std::shared_ptr<DiscogsCoverSearchContext> search, const quint64 release_id, const QUrl &url) {
DiscogsCoverReleaseContext release(search->id, release_id, url);
search->requests_release_.insert(release_id, release);
queue_release_requests_.enqueue(release);
if (!timer_flush_requests_->isActive()) {
timer_flush_requests_->start();
}
}
void DiscogsCoverProvider::SendReleaseRequest(const DiscogsCoverReleaseContext &release) {
QNetworkReply *reply = CreateRequest(release.url);
QObject::connect(reply, &QNetworkReply::finished, this, [this, reply, release]() { HandleReleaseReply(reply, release.search_id, release.id); });
}
void DiscogsCoverProvider::HandleReleaseReply(QNetworkReply *reply, const quint64 search_id, const quint64 release_id) {
if (!replies_.contains(reply)) return;
replies_.removeAll(reply);
QObject::disconnect(reply, nullptr, this, nullptr);
reply->deleteLater();
if (!requests_search_.contains(search_id)) return;
std::shared_ptr<DiscogsCoverSearchContext> search = requests_search_.value(search_id);
if (!search->requests_release_.contains(release_id)) return;
const DiscogsCoverReleaseContext &release = search->requests_release_.value(release_id);
QByteArray data = GetReplyData(reply);
if (data.isEmpty()) {
EndSearch(search, release.id);
return;
}
QJsonObject json_obj = ExtractJsonObj(data);
if (json_obj.isEmpty()) {
EndSearch(search, release.id);
return;
}
if (!json_obj.contains("artists") || !json_obj.contains("title")) {
Error("Json reply object is missing artists or title.", json_obj);
EndSearch(search, release.id);
return;
}
if (!json_obj.contains("images")) {
EndSearch(search, release.id);
return;
}
QJsonValue value_artists = json_obj["artists"];
if (!value_artists.isArray()) {
Error("Json reply object artists is not a array.", value_artists);
EndSearch(search, release.id);
return;
}
QJsonArray array_artists = value_artists.toArray();
int i = 0;
QString artist;
for (const QJsonValueRef value_artist : array_artists) {
if (!value_artist.isObject()) {
Error("Invalid Json reply, atists array value is not a object.");
continue;
}
QJsonObject obj_artist = value_artist.toObject();
if (!obj_artist.contains("name") ) {
Error("Invalid Json reply, artists array value object is missing name.", obj_artist);
continue;
}
artist = obj_artist["name"].toString();
++i;
if (artist == search->artist) break;
}
if (artist.isEmpty()) {
EndSearch(search, release.id);
return;
}
if (i > 1 && artist != search->artist) artist = "Various artists";
QString album = json_obj["title"].toString();
if (artist != search->artist && album != search->album) {
EndSearch(search, release.id);
return;
}
QJsonValue value_images = json_obj["images"];
if (!value_images.isArray()) {
Error("Json images is not an array.");
EndSearch(search, release.id);
return;
}
QJsonArray array_images = value_images.toArray();
if (array_images.isEmpty()) {
Error("Invalid Json reply, images array is empty.");
EndSearch(search, release.id);
return;
}
for (const QJsonValueRef value_image : array_images) {
if (!value_image.isObject()) {
Error("Invalid Json reply, images array value is not an object.");
continue;
}
QJsonObject obj_image = value_image.toObject();
if (!obj_image.contains("type") || !obj_image.contains("resource_url") || !obj_image.contains("width") || !obj_image.contains("height")) {
Error("Invalid Json reply, images array value object is missing type, resource_url, width or height.", obj_image);
continue;
}
QString type = obj_image["type"].toString();
if (type != "primary") {
continue;
}
int width = obj_image["width"].toInt();
int height = obj_image["height"].toInt();
if (width < 300 || height < 300) continue;
const float aspect_score = float(1.0) - float(std::max(width, height) - std::min(width, height)) / float(std::max(height, width));
if (aspect_score < 0.85) continue;
CoverProviderSearchResult result;
result.artist = artist;
result.album = album;
result.image_url = QUrl(obj_image["resource_url"].toString());
if (result.image_url.isEmpty()) continue;
search->results.append(result);
}
emit SearchResults(search->id, search->results);
search->results.clear();
EndSearch(search, release.id);
}
void DiscogsCoverProvider::EndSearch(std::shared_ptr<DiscogsCoverSearchContext> search, const quint64 release_id) {
if (search->requests_release_.contains(release_id)) {
search->requests_release_.remove(release_id);
}
if (search->requests_release_.count() <= 0) {
requests_search_.remove(search->id);
emit SearchFinished(search->id, search->results);
}
if (queue_release_requests_.isEmpty() && queue_search_requests_.isEmpty()) {
timer_flush_requests_->stop();
}
}
void DiscogsCoverProvider::Error(const QString &error, const QVariant &debug) {
qLog(Error) << "Discogs:" << error;
if (debug.isValid()) qLog(Debug) << debug;
}
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