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/* SPDX-FileCopyrightText: 2026 Project Tick
* SPDX-FileContributor: Project Tick
* SPDX-License-Identifier: GPL-3.0-or-later
*
* MeshMC - A Custom Launcher for Minecraft
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2015-2021 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 "BaseEntity.h"
#include "net/Download.h"
#include "net/HttpMetaCache.h"
#include "net/NetJob.h"
#include "Json.h"
#include "BuildConfig.h"
#include "Application.h"
class ParsingValidator : public Net::Validator
{
public: /* con/des */
ParsingValidator(Meta::BaseEntity* entity) : m_entity(entity) {};
virtual ~ParsingValidator() {};
public: /* methods */
bool init(QNetworkRequest&) override
{
return true;
}
bool write(QByteArray& data) override
{
this->data.append(data);
return true;
}
bool abort() override
{
return true;
}
bool validate(QNetworkReply&) override
{
auto fname = m_entity->localFilename();
try {
auto doc = Json::requireDocument(data, fname);
auto obj = Json::requireObject(doc, fname);
m_entity->parse(obj);
return true;
} catch (const Exception& e) {
qWarning() << "Unable to parse response:" << e.cause();
return false;
}
}
private: /* data */
QByteArray data;
Meta::BaseEntity* m_entity;
};
Meta::BaseEntity::~BaseEntity() {}
QUrl Meta::BaseEntity::url() const
{
return QUrl(BuildConfig.META_URL).resolved(localFilename());
}
bool Meta::BaseEntity::loadLocalFile()
{
const QString fname = QDir("meta").absoluteFilePath(localFilename());
if (!QFile::exists(fname)) {
return false;
}
// TODO: check if the file has the expected checksum
try {
auto doc = Json::requireDocument(fname, fname);
auto obj = Json::requireObject(doc, fname);
parse(obj);
return true;
} catch (const Exception& e) {
qDebug()
<< QString("Unable to parse file %1: %2").arg(fname, e.cause());
// just make sure it's gone and we never consider it again.
QFile::remove(fname);
return false;
}
}
void Meta::BaseEntity::load(Net::Mode loadType)
{
// load local file if nothing is loaded yet
if (!isLoaded()) {
if (loadLocalFile()) {
m_loadStatus = LoadStatus::Local;
}
}
// if we need remote update, run the update task
if (loadType == Net::Mode::Offline || !shouldStartRemoteUpdate()) {
return;
}
m_updateTask =
new NetJob(QObject::tr("Download of meta file %1").arg(localFilename()),
APPLICATION->network());
auto url = this->url();
auto entry =
APPLICATION->metacache()->resolveEntry("meta", localFilename());
entry->setStale(true);
auto dl = Net::Download::makeCached(url, entry);
/*
* The validator parses the file and loads it into the object.
* If that fails, the file is not written to storage.
*/
dl->addValidator(new ParsingValidator(this));
m_updateTask->addNetAction(dl);
m_updateStatus = UpdateStatus::InProgress;
QObject::connect(m_updateTask.get(), &NetJob::succeeded, [this]() {
m_loadStatus = LoadStatus::Remote;
m_updateStatus = UpdateStatus::Succeeded;
});
QObject::connect(m_updateTask.get(), &NetJob::failed,
[this]() { m_updateStatus = UpdateStatus::Failed; });
m_updateTask->start();
}
bool Meta::BaseEntity::isLoaded() const
{
return m_loadStatus > LoadStatus::NotLoaded;
}
bool Meta::BaseEntity::shouldStartRemoteUpdate() const
{
// TODO: version-locks and offline mode?
return m_updateStatus != UpdateStatus::InProgress;
}
Task::Ptr Meta::BaseEntity::getCurrentTask()
{
if (m_updateStatus == UpdateStatus::InProgress) {
return m_updateTask;
}
return nullptr;
}
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