pollymc/launcher/meta/BaseEntity.cpp

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/* 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 */
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ParsingValidator(Meta::BaseEntity *entity) : m_entity(entity)
{
};
virtual ~ParsingValidator()
{
};
public: /* methods */
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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
{
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auto doc = Json::requireDocument(data, fname);
auto obj = Json::requireObject(doc, fname);
m_entity->parse(obj);
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return true;
}
catch (const Exception &e)
{
qWarning() << "Unable to parse response:" << e.cause();
return false;
}
}
private: /* data */
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QByteArray data;
Meta::BaseEntity *m_entity;
};
Meta::BaseEntity::~BaseEntity()
{
}
QUrl Meta::BaseEntity::url() const
{
auto s = APPLICATION->settings();
QString metaOverride = s->get("MetaURLOverride").toString();
if(metaOverride.isEmpty())
{
return QUrl(BuildConfig.META_URL).resolved(localFilename());
}
else
{
return QUrl(metaOverride).resolved(localFilename());
}
}
bool Meta::BaseEntity::loadLocalFile()
{
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const QString fname = QDir("meta").absoluteFilePath(localFilename());
if (!QFile::exists(fname))
{
return false;
}
// TODO: check if the file has the expected checksum
try
{
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auto doc = Json::requireDocument(fname, fname);
auto obj = Json::requireObject(doc, fname);
parse(obj);
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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;
}
}
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void Meta::BaseEntity::load(Net::Mode loadType)
{
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// 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());
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auto url = this->url();
auto entry = APPLICATION->metacache()->resolveEntry("meta", localFilename());
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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);
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m_updateStatus = UpdateStatus::InProgress;
QObject::connect(m_updateTask.get(), &NetJob::succeeded, [&]()
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{
m_loadStatus = LoadStatus::Remote;
m_updateStatus = UpdateStatus::Succeeded;
m_updateTask.reset();
});
QObject::connect(m_updateTask.get(), &NetJob::failed, [&]()
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{
m_updateStatus = UpdateStatus::Failed;
m_updateTask.reset();
});
m_updateTask->start();
}
bool Meta::BaseEntity::isLoaded() const
{
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return m_loadStatus > LoadStatus::NotLoaded;
}
bool Meta::BaseEntity::shouldStartRemoteUpdate() const
{
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// TODO: version-locks and offline mode?
return m_updateStatus != UpdateStatus::InProgress;
}
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Task::Ptr Meta::BaseEntity::getCurrentTask()
{
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if(m_updateStatus == UpdateStatus::InProgress)
{
return m_updateTask;
}
return nullptr;
}