Add base classes for HTTP and Json

src/core/jsonbaserequest.cpp

@@ -0,0 +1,103 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2025, 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 <QByteArray>
+#include <QNetworkReply>
+#include <QJsonDocument>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QJsonParseError>
+
+#include "networkaccessmanager.h"
+#include "jsonbaserequest.h"
+
+using namespace Qt::Literals::StringLiterals;
+
+JsonBaseRequest::JsonBaseRequest(const SharedPtr<NetworkAccessManager> network, QObject *parent)
+    : HttpBaseRequest(network, parent) {}
+
+JsonBaseRequest::JsonObjectResult JsonBaseRequest::GetJsonObject(const QByteArray &data) {
+
+  if (data.isEmpty()) {
+    return JsonObjectResult(ErrorCode::ParseError, "Empty data from server"_L1);
+  }
+
+  QJsonParseError json_error;
+  const QJsonDocument json_document = QJsonDocument::fromJson(data, &json_error);
+  if (json_error.error != QJsonParseError::NoError) {
+    return JsonObjectResult(ErrorCode::ParseError, json_error.errorString());
+  }
+
+  if (json_document.isEmpty()) {
+    return JsonObjectResult(ErrorCode::ParseError, "Received empty Json document."_L1);
+  }
+
+  if (!json_document.isObject()) {
+    return JsonObjectResult(ErrorCode::ParseError, "Json document is not an object."_L1);
+  }
+
+  const QJsonObject json_object = json_document.object();
+  if (json_object.isEmpty()) {
+    return JsonObjectResult(ErrorCode::ParseError, "Received empty Json object."_L1);
+  }
+
+  return json_object;
+
+}
+
+JsonBaseRequest::JsonValueResult JsonBaseRequest::GetJsonValue(const QJsonObject &json_object, const QString &name) {
+
+  if (!json_object.contains(name)) {
+    return JsonValueResult(ErrorCode::ParseError, QStringLiteral("Json object is missing value %1.").arg(name));
+  }
+
+  return json_object[name];
+
+}
+
+JsonBaseRequest::JsonObjectResult JsonBaseRequest::GetJsonObject(const QJsonObject &json_object, const QString &name) {
+
+  if (!json_object.contains(name)) {
+    return JsonValueResult(ErrorCode::ParseError, QStringLiteral("Json object is missing object %1.").arg(name));
+  }
+
+  const QJsonValue json_value = json_object[name];
+  if (!json_value.isObject()) {
+    return JsonValueResult(ErrorCode::ParseError, QStringLiteral("Json value %1 is not a object.").arg(name));
+  }
+
+  return json_value.toObject();
+
+}
+
+JsonBaseRequest::JsonArrayResult JsonBaseRequest::GetJsonArray(const QJsonObject &json_object, const QString &name) {
+
+  const JsonValueResult json_value_result = GetJsonValue(json_object, name);
+  if (!json_value_result.success()) {
+    return JsonArrayResult(ErrorCode::ParseError, json_value_result.error_message);
+  }
+
+  if (!json_value_result.json_value.isArray()) {
+    return JsonArrayResult(ErrorCode::ParseError, QStringLiteral("Json object value %1 is not a array.").arg(name));
+  }
+
+  return json_value_result.json_value.toArray();
+
+}