Add podcasts support WIP

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