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/* Copyright 2015-2017 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 "Json.h"
#include "net/Download.h"
#include "net/HttpMetaCache.h"
#include "net/NetJob.h"
#include "Env.h"
#include "Json.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
{
m_entity->parse(Json::requireObject(Json::requireDocument(data, fname), fname));
return true;
}
catch (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("https://meta.multimc.org").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
{
parse(Json::requireObject(Json::requireDocument(fname, fname), fname));
return true;
}
catch (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()
{
// 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(!shouldStartRemoteUpdate())
{
return;
}
NetJob *job = new NetJob(QObject::tr("Download of meta file %1").arg(localFilename()));
auto url = this->url();
auto entry = ENV.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));
job->addNetAction(dl);
m_updateStatus = UpdateStatus::InProgress;
m_updateTask.reset(job);
QObject::connect(job, &NetJob::succeeded, [&]()
{
m_loadStatus = LoadStatus::Remote;
m_updateStatus = UpdateStatus::Succeeded;
m_updateTask.reset();
});
QObject::connect(job, &NetJob::failed, [&]()
{
m_updateStatus = UpdateStatus::Failed;
m_updateTask.reset();
});
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;
}
shared_qobject_ptr<Task> Meta::BaseEntity::getCurrentTask()
{
if(m_updateStatus == UpdateStatus::InProgress)
{
return m_updateTask;
}
return nullptr;
}
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