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Clementine-audio-player-Mac.../src/covers/discogscoverprovider.cpp

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/* This file is part of Clementine.
Copyright 2012, Martin Björklund <mbj4668@gmail.com>
Copyright 2018, Jonas Kvinge <jonas@jkvinge.net>
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 "discogscoverprovider.h"
#include <QByteArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QList>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QPair>
#include <QString>
#include <QStringList>
#include <QUrlQuery>
#include <QVariant>
#include "core/closure.h"
#include "core/logging.h"
#include "core/network.h"
#include "core/utilities.h"
const char* DiscogsCoverProvider::kUrlSearch =
"https://api.discogs.com/database/search";
const char* DiscogsCoverProvider::kUrlReleases =
"https://api.discogs.com/releases";
const char* DiscogsCoverProvider::kAccessKeyB64 =
"YVR4Yk5JTnlmUkhFY0pTaldid2c=";
const char* DiscogsCoverProvider::kSecretKeyB64 =
"QkJNb2tMVXVUVFhSRWRUVmZDc0ZGamZmSWRjdHZRVno=";
DiscogsCoverProvider::DiscogsCoverProvider(QObject* parent)
: CoverProvider("Discogs", false, parent),
network_(new NetworkAccessManager(this)) {}
bool DiscogsCoverProvider::StartSearch(const QString& artist,
const QString& album, int s_id) {
DiscogsCoverSearchContext* s_ctx = new DiscogsCoverSearchContext;
s_ctx->id = s_id;
s_ctx->artist = artist;
s_ctx->album = album;
s_ctx->r_count = 0;
requests_search_.insert(s_id, s_ctx);
SendSearchRequest(s_ctx);
return true;
}
void DiscogsCoverProvider::CancelSearch(int id) {
delete requests_search_.take(id);
}
bool DiscogsCoverProvider::StartRelease(DiscogsCoverSearchContext* s_ctx,
int r_id, QString resource_url) {
DiscogsCoverReleaseContext* r_ctx = new DiscogsCoverReleaseContext;
s_ctx->r_count++;
r_ctx->id = r_id;
r_ctx->resource_url = resource_url;
r_ctx->s_id = s_ctx->id;
requests_release_.insert(r_id, r_ctx);
SendReleaseRequest(s_ctx, r_ctx);
return true;
}
void DiscogsCoverProvider::SendSearchRequest(DiscogsCoverSearchContext* s_ctx) {
typedef QPair<QString, QString> Arg;
typedef QList<Arg> ArgList;
typedef QPair<QByteArray, QByteArray> EncodedArg;
typedef QList<EncodedArg> EncodedArgList;
ArgList args =
ArgList() << Arg("key", QByteArray::fromBase64(kAccessKeyB64))
<< Arg("secret", QByteArray::fromBase64(kSecretKeyB64));
args.append(Arg("type", "release"));
if (!s_ctx->artist.isEmpty()) {
args.append(Arg("artist", s_ctx->artist.toLower()));
}
if (!s_ctx->album.isEmpty()) {
args.append(Arg("release_title", s_ctx->album.toLower()));
}
QUrlQuery url_query;
QUrl url(kUrlSearch);
QStringList query_items;
// Encode the arguments
for (const Arg& arg : args) {
EncodedArg encoded_arg(QUrl::toPercentEncoding(arg.first),
QUrl::toPercentEncoding(arg.second));
query_items << QString(encoded_arg.first + "=" + encoded_arg.second);
url_query.addQueryItem(encoded_arg.first, encoded_arg.second);
}
// 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()));
url.setQuery(url_query);
QNetworkReply* reply = network_->get(QNetworkRequest(url));
NewClosure(reply, SIGNAL(error(QNetworkReply::NetworkError)), this,
SLOT(SearchRequestError(QNetworkReply::NetworkError,
QNetworkReply*, int)),
reply, s_ctx->id);
NewClosure(reply, SIGNAL(finished()), this,
SLOT(HandleSearchReply(QNetworkReply*, int)), reply, s_ctx->id);
}
void DiscogsCoverProvider::SendReleaseRequest(
DiscogsCoverSearchContext* s_ctx, DiscogsCoverReleaseContext* r_ctx) {
typedef QPair<QString, QString> Arg;
typedef QList<Arg> ArgList;
typedef QPair<QByteArray, QByteArray> EncodedArg;
typedef QList<EncodedArg> EncodedArgList;
QUrlQuery url_query;
QStringList query_items;
ArgList args =
ArgList() << Arg("key", QByteArray::fromBase64(kAccessKeyB64))
<< Arg("secret", QByteArray::fromBase64(kSecretKeyB64));
// Encode the arguments
for (const Arg& arg : args) {
EncodedArg encoded_arg(QUrl::toPercentEncoding(arg.first),
QUrl::toPercentEncoding(arg.second));
query_items << QString(encoded_arg.first + "=" + encoded_arg.second);
url_query.addQueryItem(encoded_arg.first, encoded_arg.second);
}
QUrl url(r_ctx->resource_url);
// 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()));
url.setQuery(url_query);
QNetworkReply* reply = network_->get(QNetworkRequest(url));
NewClosure(reply, SIGNAL(error(QNetworkReply::NetworkError)), this,
SLOT(ReleaseRequestError(QNetworkReply::NetworkError,
QNetworkReply*, int, int)),
reply, s_ctx->id, r_ctx->id);
NewClosure(reply, SIGNAL(finished()), this,
SLOT(HandleReleaseReply(QNetworkReply*, int, int)), reply,
s_ctx->id, r_ctx->id);
}
void DiscogsCoverProvider::HandleSearchReply(QNetworkReply* reply, int s_id) {
reply->deleteLater();
if (!requests_search_.contains(s_id)) return;
DiscogsCoverSearchContext* s_ctx = requests_search_.value(s_id);
QJsonDocument json_doc = QJsonDocument::fromJson(reply->readAll());
if ((json_doc.isNull()) || (!json_doc.isObject())) {
qLog(Error) << "Discogs: Failed to create JSON doc.";
EndSearch(s_ctx);
return;
}
QJsonObject json_obj = json_doc.object();
if (json_obj.isEmpty()) {
qLog(Error) << "Discogs: Failed to create JSON object.";
EndSearch(s_ctx);
return;
}
QVariantMap reply_map = json_obj.toVariantMap();
if (!reply_map.contains("results")) {
EndSearch(s_ctx);
return;
}
QVariantList results = reply_map["results"].toList();
int i = 0;
for (const QVariant& result : results) {
QVariantMap result_map = result.toMap();
if ((result_map.contains("id")) && (result_map.contains("resource_url"))) {
int r_id = result_map["id"].toInt();
QString title = result_map["title"].toString();
QString resource_url = result_map["resource_url"].toString();
if (resource_url.isEmpty()) continue;
StartRelease(s_ctx, r_id, resource_url);
i++;
}
}
if (i <= 0) EndSearch(s_ctx);
}
void DiscogsCoverProvider::HandleReleaseReply(QNetworkReply* reply, int s_id,
int r_id) {
reply->deleteLater();
if (!requests_release_.contains(r_id)) return;
DiscogsCoverReleaseContext* r_ctx = requests_release_.value(r_id);
if (!requests_search_.contains(s_id)) {
EndSearch(r_ctx);
return;
}
DiscogsCoverSearchContext* s_ctx = requests_search_.value(s_id);
QJsonDocument json_doc = QJsonDocument::fromJson(reply->readAll());
if ((json_doc.isNull()) || (!json_doc.isObject())) {
qLog(Error) << "Discogs: Failed to create JSON doc.";
EndSearch(s_ctx, r_ctx);
return;
}
QJsonObject json_obj = json_doc.object();
if (json_obj.isEmpty()) {
qLog(Error) << "Discogs: JSON object is empty.";
EndSearch(s_ctx, r_ctx);
return;
}
QVariantMap reply_map = json_obj.toVariantMap();
if (!reply_map.contains("images")) {
EndSearch(s_ctx, r_ctx);
return;
}
QVariantList results = reply_map["images"].toList();
for (const QVariant& result : results) {
QVariantMap result_map = result.toMap();
CoverSearchResult cover_result;
cover_result.description = s_ctx->title;
if (result_map.contains("type")) {
QString type = result_map["type"].toString();
if (type != "primary") continue;
}
if (result_map.contains("resource_url")) {
cover_result.image_url = QUrl(result_map["resource_url"].toString());
}
if (cover_result.image_url.isEmpty()) continue;
s_ctx->results.append(cover_result);
}
EndSearch(s_ctx, r_ctx);
}
void DiscogsCoverProvider::SearchRequestError(QNetworkReply::NetworkError error,
QNetworkReply* reply, int s_id) {
if (!requests_search_.contains(s_id)) return;
DiscogsCoverSearchContext* s_ctx = requests_search_.value(s_id);
EndSearch(s_ctx);
}
void DiscogsCoverProvider::ReleaseRequestError(
QNetworkReply::NetworkError error, QNetworkReply* reply, int s_id,
int r_id) {
if (!requests_release_.contains(r_id)) return;
DiscogsCoverReleaseContext* r_ctx = requests_release_.value(r_id);
if (!requests_search_.contains(s_id)) {
EndSearch(r_ctx);
return;
}
DiscogsCoverSearchContext* s_ctx = requests_search_.value(s_id);
EndSearch(s_ctx, r_ctx);
}
void DiscogsCoverProvider::EndSearch(DiscogsCoverSearchContext* s_ctx,
DiscogsCoverReleaseContext* r_ctx) {
delete requests_release_.take(r_ctx->id);
s_ctx->r_count--;
if (s_ctx->r_count <= 0) EndSearch(s_ctx);
}
void DiscogsCoverProvider::EndSearch(DiscogsCoverSearchContext* s_ctx) {
requests_search_.remove(s_ctx->id);
emit SearchFinished(s_ctx->id, s_ctx->results);
delete s_ctx;
}
void DiscogsCoverProvider::EndSearch(DiscogsCoverReleaseContext* r_ctx) {
delete requests_release_.take(r_ctx->id);
}
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