Add Subsonic support (#180)

src/subsonic/subsonicbaserequest.cpp

@@ -0,0 +1,207 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2019, 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 <QObject>
+#include <QByteArray>
+#include <QPair>
+#include <QList>
+#include <QString>
+#include <QUrl>
+#include <QUrlQuery>
+#include <QSslConfiguration>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QJsonParseError>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QJsonValue>
+
+#include "core/logging.h"
+#include "core/network.h"
+#include "subsonicservice.h"
+#include "subsonicbaserequest.h"
+
+SubsonicBaseRequest::SubsonicBaseRequest(SubsonicService *service, NetworkAccessManager *network, QObject *parent) :
+      QObject(parent),
+      service_(service),
+      network_(network)
+      {}
+
+SubsonicBaseRequest::~SubsonicBaseRequest() {
+
+  while (!replies_.isEmpty()) {
+    QNetworkReply *reply = replies_.takeFirst();
+    disconnect(reply, 0, nullptr, 0);
+    if (reply->isRunning()) reply->abort();
+    reply->deleteLater();
+  }
+
+}
+
+QUrl SubsonicBaseRequest::CreateUrl(const QString &ressource_name, const QList<Param> &params_provided) {
+
+  ParamList params = ParamList() << params_provided
+                                 << Param("c", client_name())
+                                 << Param("v", api_version())
+                                 << Param("f", "json")
+                                 << Param("u", username())
+                                 << Param("p", QString("enc:" + password().toUtf8().toHex()));
+
+  QUrlQuery url_query;
+  for (const Param& param : params) {
+    EncodedParam encoded_param(QUrl::toPercentEncoding(param.first), QUrl::toPercentEncoding(param.second));
+    url_query.addQueryItem(encoded_param.first, encoded_param.second);
+  }
+
+  QUrl url;
+  url.setScheme("https");
+  url.setHost(hostname());
+  if (port() > 0 && port() != 443)
+    url.setPort(port());
+  url.setPath(QString("/rest/") + ressource_name);
+  url.setQuery(url_query);
+
+  return url;
+
+}
+
+QNetworkReply *SubsonicBaseRequest::CreateGetRequest(const QString &ressource_name, const QList<Param> &params_provided) {
+
+  QUrl url = CreateUrl(ressource_name, params_provided);
+  QNetworkRequest req(url);
+
+  if (!verify_certificate()) {
+    QSslConfiguration sslconfig = QSslConfiguration::defaultConfiguration();
+    sslconfig.setPeerVerifyMode(QSslSocket::VerifyNone);
+    req.setSslConfiguration(sslconfig);
+  }
+
+  req.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
+
+  QNetworkReply *reply = network_->get(req);
+  replies_ << reply;
+
+  //qLog(Debug) << "Subsonic: Sending request" << url;
+
+  return reply;
+
+}
+
+QByteArray SubsonicBaseRequest::GetReplyData(QNetworkReply *reply, QString &error) {
+
+  if (replies_.contains(reply)) {
+    replies_.removeAll(reply);
+    reply->deleteLater();
+  }
+
+  QByteArray data;
+
+  if (reply->error() == QNetworkReply::NoError) {
+    data = reply->readAll();
+  }
+  else {
+    if (reply->error() < 200) {
+      // This is a network error, there is nothing more to do.
+      error = Error(QString("%1 (%2)").arg(reply->errorString()).arg(reply->error()));
+    }
+    else {
+      // See if there is Json data containing "error" - then use that instead.
+      data = reply->readAll();
+      QJsonParseError parse_error;
+      QJsonDocument json_doc = QJsonDocument::fromJson(data, &parse_error);
+      QString failure_reason;
+      if (parse_error.error == QJsonParseError::NoError && !json_doc.isNull() && !json_doc.isEmpty() && json_doc.isObject()) {
+        QJsonObject json_obj = json_doc.object();
+        if (!json_obj.isEmpty() && json_obj.contains("error")) {
+          QJsonValue json_error = json_obj["error"];
+          if (json_error.isObject()) {
+            json_obj = json_error.toObject();
+            if (!json_obj.isEmpty() && json_obj.contains("code") && json_obj.contains("message")) {
+              int code = json_obj["code"].toInt();
+              QString message = json_obj["message"].toString();
+              failure_reason = QString("%1 (%2)").arg(message).arg(code);
+            }
+          }
+        }
+      }
+      if (failure_reason.isEmpty()) {
+        failure_reason = QString("%1 (%2)").arg(reply->errorString()).arg(reply->error());
+      }
+      error = Error(failure_reason);
+    }
+    return QByteArray();
+  }
+
+  return data;
+
+}
+
+QJsonObject SubsonicBaseRequest::ExtractJsonObj(QByteArray &data, QString &error) {
+
+  QJsonParseError json_error;
+  QJsonDocument json_doc = QJsonDocument::fromJson(data, &json_error);
+
+  if (json_error.error != QJsonParseError::NoError) {
+    error = Error("Reply from server missing Json data.", data);
+    return QJsonObject();
+  }
+
+  if (json_doc.isNull() || json_doc.isEmpty()) {
+    error = Error("Received empty Json document.", data);
+    return QJsonObject();
+  }
+
+  if (!json_doc.isObject()) {
+    error = Error("Json document is not an object.", json_doc);
+    return QJsonObject();
+  }
+
+  QJsonObject json_obj = json_doc.object();
+  if (json_obj.isEmpty()) {
+    error = Error("Received empty Json object.", json_doc);
+    return QJsonObject();
+  }
+
+  if (!json_obj.contains("subsonic-response")) {
+    error = Error("Json reply is missing subsonic-response.", json_obj);
+    return QJsonObject();
+  }
+
+  QJsonValue json_response = json_obj["subsonic-response"];
+  if (!json_response.isObject()) {
+    error = Error("Json response is not an object.", json_response);
+    return QJsonObject();
+  }
+  json_obj = json_response.toObject();
+
+  return json_obj;
+
+}
+
+QString SubsonicBaseRequest::Error(QString error, QVariant debug) {
+
+  qLog(Error) << "Subsonic:" << error;
+  if (debug.isValid()) qLog(Debug) << debug;
+
+  return error;
+
+}