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/* Copyright 2013-2015 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 "CacheDownload.h"
#include <QCryptographicHash>
#include <QFileInfo>
#include <QDateTime>
#include <QDebug>
#include "Env.h"
#include <FileSystem.h>
CacheDownload::CacheDownload(QUrl url, MetaEntryPtr entry)
: NetAction(), md5sum(QCryptographicHash::Md5)
{
m_url = url;
m_entry = entry;
m_target_path = entry->getFullPath();
m_status = Job_NotStarted;
}
void CacheDownload::start()
{
m_status = Job_InProgress;
if (!m_entry->isStale())
{
m_status = Job_Finished;
emit succeeded(m_index_within_job);
return;
}
// create a new save file
m_output_file.reset(new QSaveFile(m_target_path));
// if there already is a file and md5 checking is in effect and it can be opened
if (!FS::ensureFilePathExists(m_target_path))
{
qCritical() << "Could not create folder for " + m_target_path;
m_status = Job_Failed;
emit failed(m_index_within_job);
return;
}
if (!m_output_file->open(QIODevice::WriteOnly))
{
qCritical() << "Could not open " + m_target_path + " for writing";
m_status = Job_Failed;
emit failed(m_index_within_job);
return;
}
qDebug() << "Downloading " << m_url.toString();
QNetworkRequest request(m_url);
// check file consistency first.
QFile current(m_target_path);
if(current.exists() && current.size() != 0)
{
if (m_entry->getRemoteChangedTimestamp().size())
request.setRawHeader(QString("If-Modified-Since").toLatin1(),
m_entry->getRemoteChangedTimestamp().toLatin1());
if (m_entry->getETag().size())
request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->getETag().toLatin1());
}
request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Cached)");
auto worker = ENV.qnam();
QNetworkReply *rep = worker->get(request);
m_reply.reset(rep);
connect(rep, SIGNAL(downloadProgress(qint64, qint64)),
SLOT(downloadProgress(qint64, qint64)));
connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
connect(rep, SIGNAL(error(QNetworkReply::NetworkError)),
SLOT(downloadError(QNetworkReply::NetworkError)));
connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
}
void CacheDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
m_total_progress = bytesTotal;
m_progress = bytesReceived;
emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
}
void CacheDownload::downloadError(QNetworkReply::NetworkError error)
{
// error happened during download.
qCritical() << "Failed " << m_url.toString() << " with reason " << error;
m_status = Job_Failed;
}
void CacheDownload::downloadFinished()
{
QVariant redirect = m_reply->header(QNetworkRequest::LocationHeader);
QString redirectURL;
if(redirect.isValid())
{
redirectURL = redirect.toString();
}
// FIXME: This is a hack for https://bugreports.qt-project.org/browse/QTBUG-41061
else if(m_reply->hasRawHeader("Location"))
{
auto data = m_reply->rawHeader("Location");
if(data.size() > 2 && data[0] == '/' && data[1] == '/')
redirectURL = m_reply->url().scheme() + ":" + data;
}
if (!redirectURL.isEmpty())
{
m_url = QUrl(redirect.toString());
qDebug() << "Following redirect to " << m_url.toString();
start();
return;
}
// if the download succeeded
if (m_status == Job_Failed)
{
m_output_file->cancelWriting();
m_reply.reset();
emit failed(m_index_within_job);
return;
}
// if we wrote any data to the save file, we try to commit the data to the real file.
if (wroteAnyData)
{
// nothing went wrong...
if (m_output_file->commit())
{
m_status = Job_Finished;
m_entry->setMD5Sum(md5sum.result().toHex().constData());
}
else
{
qCritical() << "Failed to commit changes to " << m_target_path;
m_output_file->cancelWriting();
m_reply.reset();
m_status = Job_Failed;
emit failed(m_index_within_job);
return;
}
}
else
{
m_status = Job_Finished;
}
// then get rid of the save file
m_output_file.reset();
QFileInfo output_file_info(m_target_path);
m_entry->setETag(m_reply->rawHeader("ETag").constData());
if (m_reply->hasRawHeader("Last-Modified"))
{
m_entry->setRemoteChangedTimestamp(m_reply->rawHeader("Last-Modified").constData());
}
m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch());
m_entry->setStale(false);
ENV.metacache()->updateEntry(m_entry);
m_reply.reset();
emit succeeded(m_index_within_job);
return;
}
void CacheDownload::downloadReadyRead()
{
QByteArray ba = m_reply->readAll();
md5sum.addData(ba);
if (m_output_file->write(ba) != ba.size())
{
qCritical() << "Failed writing into " + m_target_path;
m_status = Job_Failed;
m_reply->abort();
emit failed(m_index_within_job);
}
wroteAnyData = true;
}
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