path: root/archived/projt-launcher/launcher/Json.cpp

// SPDX-License-Identifier: GPL-3.0-only
// SPDX-FileCopyrightText: 2026 Project Tick
// SPDX-FileContributor: Project Tick Team
/*
 *  ProjT Launcher - Minecraft Launcher
 *  Copyright (C) 2026 Project Tick
 *
 *  This program 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, version 3.
 *
 *  This program 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 this program.  If not, write to the Free Software Foundation,
 *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
/* === Upstream License Block (Do Not Modify) ==============================
 *
 *  Prism Launcher - Minecraft Launcher
 *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
 *
 *  This program 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, version 3.
 *
 *  This program 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 this program.  If not, write to the Free Software Foundation,
 *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *      Copyright 2013-2021 MultiMC Contributors
 *
 *      Licensed under the Apache License, Version 2.0 (the "License");
 *      you may not use this file except in compliance with the License.
 *      You may obtain a copy of the License at
 *
 *          http://www.apache.org/licenses/LICENSE-2.0
 *
 *      Unless required by applicable law or agreed to in writing, software
 *      distributed under the License is distributed on an "AS IS" BASIS,
 *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *      See the License for the specific language governing permissions and
 *      limitations under the License.
 *
   ======================================================================== */

#include "Json.h"

#include <QFile>

#include <math.h>
#include "FileSystem.h"

namespace Json
{
	void write(const QJsonDocument& doc, const QString& filename)
	{
		FS::write(filename, doc.toJson());
	}
	void write(const QJsonObject& object, const QString& filename)
	{
		write(QJsonDocument(object), filename);
	}
	void write(const QJsonArray& array, const QString& filename)
	{
		write(QJsonDocument(array), filename);
	}

	QByteArray toText(const QJsonObject& obj)
	{
		return QJsonDocument(obj).toJson(QJsonDocument::Compact);
	}
	QByteArray toText(const QJsonArray& array)
	{
		return QJsonDocument(array).toJson(QJsonDocument::Compact);
	}

	static bool isBinaryJson(const QByteArray& data)
	{
		decltype(QJsonDocument::BinaryFormatTag) tag = QJsonDocument::BinaryFormatTag;
		return memcmp(data.constData(), &tag, sizeof(QJsonDocument::BinaryFormatTag)) == 0;
	}
	QJsonDocument requireDocument(const QByteArray& data, const QString& what)
	{
		if (isBinaryJson(data))
		{
			// Binary JSON is not supported by this application
			throw JsonException(what + ": Invalid JSON. Binary JSON unsupported");
		}
		else
		{
			QJsonParseError error;
			QJsonDocument doc = QJsonDocument::fromJson(data, &error);
			if (error.error != QJsonParseError::NoError)
			{
				throw JsonException(what + ": Error parsing JSON: " + error.errorString());
			}
			return doc;
		}
	}
	QJsonDocument requireDocument(const QString& filename, const QString& what)
	{
		return requireDocument(FS::read(filename), what);
	}
	QJsonObject requireObject(const QJsonDocument& doc, const QString& what)
	{
		if (!doc.isObject())
		{
			throw JsonException(what + " is not an object");
		}
		return doc.object();
	}
	QJsonArray requireArray(const QJsonDocument& doc, const QString& what)
	{
		if (!doc.isArray())
		{
			throw JsonException(what + " is not an array");
		}
		return doc.array();
	}

	void writeString(QJsonObject& to, const QString& key, const QString& value)
	{
		if (!value.isEmpty())
		{
			to.insert(key, value);
		}
	}

	void writeStringList(QJsonObject& to, const QString& key, const QStringList& values)
	{
		if (!values.isEmpty())
		{
			QJsonArray array;
			for (auto value : values)
			{
				array.append(value);
			}
			to.insert(key, array);
		}
	}

	template <>
	QJsonValue toJson<QUrl>(const QUrl& url)
	{
		return QJsonValue(url.toString(QUrl::FullyEncoded));
	}
	template <>
	QJsonValue toJson<QByteArray>(const QByteArray& data)
	{
		return QJsonValue(QString::fromLatin1(data.toHex()));
	}
	template <>
	QJsonValue toJson<QDateTime>(const QDateTime& datetime)
	{
		return QJsonValue(datetime.toString(Qt::ISODate));
	}
	template <>
	QJsonValue toJson<QDir>(const QDir& dir)
	{
		return QDir::current().relativeFilePath(dir.absolutePath());
	}
	template <>
	QJsonValue toJson<QUuid>(const QUuid& uuid)
	{
		return uuid.toString();
	}
	template <>
	QJsonValue toJson<QVariant>(const QVariant& variant)
	{
		return QJsonValue::fromVariant(variant);
	}

	template <>
	QByteArray requireIsType<QByteArray>(const QJsonValue& value, const QString& what)
	{
		const QString string = ensureIsType<QString>(value, what);
		// ensure that the string can be safely cast to Latin1
		if (string != QString::fromLatin1(string.toLatin1()))
		{
			throw JsonException(what + " is not encodable as Latin1");
		}
		return QByteArray::fromHex(string.toLatin1());
	}

	template <>
	QJsonArray requireIsType<QJsonArray>(const QJsonValue& value, const QString& what)
	{
		if (!value.isArray())
		{
			throw JsonException(what + " is not an array");
		}
		return value.toArray();
	}

	template <>
	QString requireIsType<QString>(const QJsonValue& value, const QString& what)
	{
		if (!value.isString())
		{
			throw JsonException(what + " is not a string");
		}
		return value.toString();
	}

	template <>
	bool requireIsType<bool>(const QJsonValue& value, const QString& what)
	{
		if (!value.isBool())
		{
			throw JsonException(what + " is not a bool");
		}
		return value.toBool();
	}

	template <>
	double requireIsType<double>(const QJsonValue& value, const QString& what)
	{
		if (!value.isDouble())
		{
			throw JsonException(what + " is not a double");
		}
		// Burada value'nin double'a çevrilmesi bekleniyor. Eğer value uygun değilse, Qt varsayılan olarak 0 döndürür.
		return value.toDouble();
	}

	template <>
	int requireIsType<int>(const QJsonValue& value, const QString& what)
	{
		const double doubl = requireIsType<double>(value, what);
		if (fmod(doubl, 1) != 0)
		{
			throw JsonException(what + " is not an integer");
		}
		return int(doubl);
	}

	template <>
	QDateTime requireIsType<QDateTime>(const QJsonValue& value, const QString& what)
	{
		const QString string	 = requireIsType<QString>(value, what);
		const QDateTime datetime = QDateTime::fromString(string, Qt::ISODate);
		if (!datetime.isValid())
		{
			throw JsonException(what + " is not a ISO formatted date/time value");
		}
		return datetime;
	}

	template <>
	QUrl requireIsType<QUrl>(const QJsonValue& value, const QString& what)
	{
		const QString string = ensureIsType<QString>(value, what);
		if (string.isEmpty())
		{
			return QUrl();
		}
		const QUrl url = QUrl(string, QUrl::StrictMode);
		if (!url.isValid())
		{
			throw JsonException(what + " is not a correctly formatted URL");
		}
		return url;
	}

	template <>
	QDir requireIsType<QDir>(const QJsonValue& value, const QString& what)
	{
		const QString string = requireIsType<QString>(value, what);

		// Security: Prevent path traversal attacks
		if (QFileInfo(string).isAbsolute())
		{
			throw JsonException(what + ": Absolute paths are not allowed");
		}

		// Sanitize path - remove dangerous characters and sequences
		QString sanitized = string;
		sanitized.replace("..", "");  // Remove parent directory references
		sanitized.replace("\\", "/"); // Normalize separators
		// Remove other potentially dangerous characters
		sanitized.remove(QRegularExpression("[<>:\"|?*]"));

		return QDir::current().absoluteFilePath(sanitized);
	}

	template <>
	QUuid requireIsType<QUuid>(const QJsonValue& value, const QString& what)
	{
		const QString string = requireIsType<QString>(value, what);
		const QUuid uuid	 = QUuid(string);
		if (uuid.toString() != string) // converts back => valid
		{
			throw JsonException(what + " is not a valid UUID");
		}
		return uuid;
	}

	template <>
	QJsonObject requireIsType<QJsonObject>(const QJsonValue& value, const QString& what)
	{
		if (!value.isObject())
		{
			throw JsonException(what + " is not an object");
		}
		return value.toObject();
	}

	template <>
	QVariant requireIsType<QVariant>(const QJsonValue& value, const QString& what)
	{
		if (value.isNull() || value.isUndefined())
		{
			throw JsonException(what + " is null or undefined");
		}
		return value.toVariant();
	}

	template <>
	QJsonValue requireIsType<QJsonValue>(const QJsonValue& value, const QString& what)
	{
		if (value.isNull() || value.isUndefined())
		{
			throw JsonException(what + " is null or undefined");
		}
		return value;
	}

	QStringList toStringList(const QString& jsonString)
	{
		QJsonParseError parseError;
		QJsonDocument doc = QJsonDocument::fromJson(jsonString.toUtf8(), &parseError);

		if (parseError.error != QJsonParseError::NoError || !doc.isArray())
			return {};
		try
		{
			return ensureIsArrayOf<QString>(doc.array(), "");
		}
		catch (Json::JsonException&)
		{
			return {};
		}
	}

	QString fromStringList(const QStringList& list)
	{
		QJsonArray array;
		for (const QString& str : list)
		{
			array.append(str);
		}

		QJsonDocument doc(toJsonArray(list));
		return QString::fromUtf8(doc.toJson(QJsonDocument::Compact));
	}

	QVariantMap toMap(const QString& jsonString)
	{
		QJsonParseError parseError;
		QJsonDocument doc = QJsonDocument::fromJson(jsonString.toUtf8(), &parseError);

		if (parseError.error != QJsonParseError::NoError || !doc.isObject())
			return {};

		QJsonObject obj = doc.object();
		return obj.toVariantMap();
	}

	QString fromMap(const QVariantMap& map)
	{
		QJsonObject obj = QJsonObject::fromVariantMap(map);
		QJsonDocument doc(obj);
		return QString::fromUtf8(doc.toJson(QJsonDocument::Compact));
	}

} // namespace Json