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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 "Env.h"
#include "MD5EtagDownload.h"
#include <FileSystem.h>
#include <QCryptographicHash>
#include <QDebug>
MD5EtagDownload::MD5EtagDownload(QUrl url, QString target_path) : NetAction()
{
m_url = url;
m_target_path = target_path;
m_status = Job_NotStarted;
}
void MD5EtagDownload::start()
{
QString filename = m_target_path;
m_output_file.setFileName(filename);
// if there already is a file and md5 checking is in effect and it can be opened
if (m_output_file.exists() && m_output_file.open(QIODevice::ReadOnly))
{
// get the md5 of the local file.
m_local_md5 =
QCryptographicHash::hash(m_output_file.readAll(), QCryptographicHash::Md5)
.toHex()
.constData();
m_output_file.close();
// if we are expecting some md5sum, compare it with the local one
if (!m_expected_md5.isEmpty())
{
// skip if they match
if(m_local_md5 == m_expected_md5)
{
qDebug() << "Skipping " << m_url.toString() << ": md5 match.";
emit succeeded(m_index_within_job);
return;
}
}
else
{
// no expected md5. we use the local md5sum as an ETag
}
}
if (!FS::ensureFilePathExists(filename))
{
emit failed(m_index_within_job);
return;
}
QNetworkRequest request(m_url);
qDebug() << "Downloading " << m_url.toString() << " local MD5: " << m_local_md5;
if(!m_local_md5.isEmpty())
{
request.setRawHeader(QString("If-None-Match").toLatin1(), m_local_md5.toLatin1());
}
if(!m_expected_md5.isEmpty())
qDebug() << "Expecting " << m_expected_md5;
request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
// Go ahead and try to open the file.
// If we don't do this, empty files won't be created, which breaks the updater.
// Plus, this way, we don't end up starting a download for a file we can't open.
if (!m_output_file.open(QIODevice::WriteOnly))
{
emit failed(m_index_within_job);
return;
}
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 MD5EtagDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
m_total_progress = bytesTotal;
m_progress = bytesReceived;
emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
}
void MD5EtagDownload::downloadError(QNetworkReply::NetworkError error)
{
qCritical() << "Error" << error << ":" << m_reply->errorString() << "while downloading"
<< m_reply->url();
m_status = Job_Failed;
}
void MD5EtagDownload::downloadFinished()
{
// if the download succeeded
if (m_status != Job_Failed)
{
// nothing went wrong...
m_status = Job_Finished;
m_output_file.close();
// FIXME: compare with the real written data md5sum
// this is just an ETag
qDebug() << "Finished " << m_url.toString() << " got " << m_reply->rawHeader("ETag").constData();
m_reply.reset();
emit succeeded(m_index_within_job);
return;
}
// else the download failed
else
{
m_output_file.close();
m_output_file.remove();
m_reply.reset();
emit failed(m_index_within_job);
return;
}
}
void MD5EtagDownload::downloadReadyRead()
{
if (!m_output_file.isOpen())
{
if (!m_output_file.open(QIODevice::WriteOnly))
{
/*
* Can't open the file... the job failed
*/
m_reply->abort();
emit failed(m_index_within_job);
return;
}
}
m_output_file.write(m_reply->readAll());
}
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