Add setting for lyric providers and add more providers

Fixes #335

src/lyrics/geniuslyricsprovider.h

@@ -0,0 +1,108 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2020, 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 GENIUSLYRICSPROVIDER_H
+#define GENIUSLYRICSPROVIDER_H
+
+#include "config.h"
+
+#include <memory.h>
+
+#include <QtGlobal>
+#include <QObject>
+#include <QList>
+#include <QMap>
+#include <QVariant>
+#include <QString>
+#include <QStringList>
+#include <QUrl>
+#include <QSslError>
+#include <QJsonArray>
+
+#include "jsonlyricsprovider.h"
+#include "lyricsfetcher.h"
+
+class QNetworkAccessManager;
+class QNetworkReply;
+
+class LocalRedirectServer;
+
+class GeniusLyricsProvider : public JsonLyricsProvider {
+  Q_OBJECT
+
+ public:
+  explicit GeniusLyricsProvider(QObject *parent = nullptr);
+
+  bool IsAuthenticated() { return !access_token_.isEmpty(); }
+  void Authenticate();
+  void Deauthenticate() { access_token_.clear(); }
+
+  bool StartSearch(const QString &artist, const QString &album, const QString &title, quint64 id);
+  void CancelSearch(const quint64 id);
+
+ public:
+  struct GeniusLyricsLyricContext {
+    explicit GeniusLyricsLyricContext() {}
+    QString artist;
+    QString title;
+    QUrl url;
+  };
+  struct GeniusLyricsSearchContext {
+    explicit GeniusLyricsSearchContext() : id(-1) {}
+    int id;
+    QString artist;
+    QString title;
+    QMap<QUrl, GeniusLyricsLyricContext> requests_lyric_;
+    LyricsSearchResults results;
+  };
+
+ private:
+  void RequestAccessToken(const QUrl &url, const QUrl &redirect_url);
+  void AuthError(const QString &error = QString(), const QVariant &debug = QVariant());
+  void Error(const QString &error, const QVariant &debug = QVariant());
+  void EndSearch(std::shared_ptr<GeniusLyricsSearchContext> search, const GeniusLyricsLyricContext lyric = GeniusLyricsLyricContext());
+
+ private slots:
+  void HandleLoginSSLErrors(QList<QSslError> ssl_errors);
+  void RedirectArrived();
+  void AccessTokenRequestFinished(QNetworkReply *reply);
+  void HandleSearchReply(QNetworkReply *reply, const quint64 id);
+  void HandleLyricReply(QNetworkReply *reply, const int search_id, const QUrl &url);
+
+ private:
+  static const char *kSettingsGroup;
+  static const char *kClientIDB64;
+  static const char *kClientSecretB64;
+  static const char *kOAuthAuthorizeUrl;
+  static const char *kOAuthAccessTokenUrl;
+  static const char *kOAuthRedirectUrl;
+  static const char *kUrlSearch;
+
+ private:
+  QNetworkAccessManager *network_;
+  LocalRedirectServer *server_;
+  QString code_verifier_;
+  QString code_challenge_;
+  QString access_token_;
+  QStringList login_errors_;
+  QMap<int, std::shared_ptr<GeniusLyricsSearchContext>> requests_search_;
+
+};
+
+#endif  // GENIUSLYRICSPROVIDER_H