156 lines
4.2 KiB
C++
156 lines
4.2 KiB
C++
/* Copyright 2013-2015 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Env.h"
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#include "MD5EtagDownload.h"
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#include <FileSystem.h>
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#include <QCryptographicHash>
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#include <QDebug>
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MD5EtagDownload::MD5EtagDownload(QUrl url, QString target_path) : NetAction()
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{
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m_url = url;
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m_target_path = target_path;
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m_status = Job_NotStarted;
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}
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void MD5EtagDownload::start()
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{
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QString filename = m_target_path;
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m_output_file.setFileName(filename);
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// if there already is a file and md5 checking is in effect and it can be opened
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if (m_output_file.exists() && m_output_file.open(QIODevice::ReadOnly))
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{
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// get the md5 of the local file.
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m_local_md5 =
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QCryptographicHash::hash(m_output_file.readAll(), QCryptographicHash::Md5)
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.toHex()
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.constData();
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m_output_file.close();
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// if we are expecting some md5sum, compare it with the local one
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if (!m_expected_md5.isEmpty())
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{
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// skip if they match
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if(m_local_md5 == m_expected_md5)
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{
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qDebug() << "Skipping " << m_url.toString() << ": md5 match.";
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emit succeeded(m_index_within_job);
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return;
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}
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}
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else
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{
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// no expected md5. we use the local md5sum as an ETag
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}
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}
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if (!FS::ensureFilePathExists(filename))
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{
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emit failed(m_index_within_job);
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return;
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}
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QNetworkRequest request(m_url);
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qDebug() << "Downloading " << m_url.toString() << " local MD5: " << m_local_md5;
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if(!m_local_md5.isEmpty())
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{
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request.setRawHeader(QString("If-None-Match").toLatin1(), m_local_md5.toLatin1());
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}
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if(!m_expected_md5.isEmpty())
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qDebug() << "Expecting " << m_expected_md5;
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request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
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// Go ahead and try to open the file.
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// If we don't do this, empty files won't be created, which breaks the updater.
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// Plus, this way, we don't end up starting a download for a file we can't open.
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if (!m_output_file.open(QIODevice::WriteOnly))
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{
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emit failed(m_index_within_job);
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return;
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}
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auto worker = ENV.qnam();
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QNetworkReply *rep = worker->get(request);
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m_reply.reset(rep);
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connect(rep, SIGNAL(downloadProgress(qint64, qint64)),
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SLOT(downloadProgress(qint64, qint64)));
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connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
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connect(rep, SIGNAL(error(QNetworkReply::NetworkError)),
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SLOT(downloadError(QNetworkReply::NetworkError)));
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connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
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}
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void MD5EtagDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
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{
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m_total_progress = bytesTotal;
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m_progress = bytesReceived;
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emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
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}
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void MD5EtagDownload::downloadError(QNetworkReply::NetworkError error)
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{
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qCritical() << "Error" << error << ":" << m_reply->errorString() << "while downloading"
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<< m_reply->url();
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m_status = Job_Failed;
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}
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void MD5EtagDownload::downloadFinished()
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{
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// if the download succeeded
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if (m_status != Job_Failed)
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{
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// nothing went wrong...
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m_status = Job_Finished;
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m_output_file.close();
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// FIXME: compare with the real written data md5sum
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// this is just an ETag
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qDebug() << "Finished " << m_url.toString() << " got " << m_reply->rawHeader("ETag").constData();
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m_reply.reset();
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emit succeeded(m_index_within_job);
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return;
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}
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// else the download failed
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else
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{
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m_output_file.close();
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m_output_file.remove();
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m_reply.reset();
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emit failed(m_index_within_job);
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return;
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}
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}
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void MD5EtagDownload::downloadReadyRead()
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{
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if (!m_output_file.isOpen())
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{
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if (!m_output_file.open(QIODevice::WriteOnly))
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{
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/*
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* Can't open the file... the job failed
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*/
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m_reply->abort();
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emit failed(m_index_within_job);
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return;
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}
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}
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m_output_file.write(m_reply->readAll());
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}
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