311 lines
8.7 KiB
C++
311 lines
8.7 KiB
C++
/* Copyright 2013-2021 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 "Download.h"
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#include <QFileInfo>
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#include <QDateTime>
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#include <QDebug>
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#include "FileSystem.h"
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#include "ChecksumValidator.h"
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#include "MetaCacheSink.h"
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#include "ByteArraySink.h"
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#include "BuildConfig.h"
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namespace Net {
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Download::Download():NetAction()
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{
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m_status = Job_NotStarted;
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}
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Download::Ptr Download::makeCached(QUrl url, MetaEntryPtr entry, Options options)
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{
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Download * dl = new Download();
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dl->m_url = url;
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dl->m_options = options;
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auto md5Node = new ChecksumValidator(QCryptographicHash::Md5);
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auto cachedNode = new MetaCacheSink(entry, md5Node);
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dl->m_sink.reset(cachedNode);
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dl->m_target_path = entry->getFullPath();
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return dl;
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}
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Download::Ptr Download::makeByteArray(QUrl url, QByteArray *output, Options options)
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{
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Download * dl = new Download();
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dl->m_url = url;
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dl->m_options = options;
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dl->m_sink.reset(new ByteArraySink(output));
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return dl;
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}
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Download::Ptr Download::makeFile(QUrl url, QString path, Options options)
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{
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Download * dl = new Download();
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dl->m_url = url;
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dl->m_options = options;
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dl->m_sink.reset(new FileSink(path));
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return dl;
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}
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void Download::addValidator(Validator * v)
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{
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m_sink->addValidator(v);
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}
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void Download::startImpl()
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{
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if(m_status == Job_Aborted)
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{
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qWarning() << "Attempt to start an aborted Download:" << m_url.toString();
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emit aborted(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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m_status = m_sink->init(request);
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switch(m_status)
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{
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case Job_Finished:
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emit succeeded(m_index_within_job);
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qDebug() << "Download cache hit " << m_url.toString();
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return;
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case Job_InProgress:
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qDebug() << "Downloading " << m_url.toString();
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break;
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case Job_Failed_Proceed: // this is meaningless in this context. We do need a sink.
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case Job_NotStarted:
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case Job_Failed:
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emit failed(m_index_within_job);
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return;
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case Job_Aborted:
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return;
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}
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request.setHeader(QNetworkRequest::UserAgentHeader, BuildConfig.USER_AGENT);
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QNetworkReply *rep = m_network->get(request);
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m_reply.reset(rep);
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connect(rep, SIGNAL(downloadProgress(qint64, qint64)), SLOT(downloadProgress(qint64, qint64)));
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connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
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connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), SLOT(downloadError(QNetworkReply::NetworkError)));
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connect(rep, &QNetworkReply::sslErrors, this, &Download::sslErrors);
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connect(rep, &QNetworkReply::readyRead, this, &Download::downloadReadyRead);
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}
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void Download::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 Download::downloadError(QNetworkReply::NetworkError error)
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{
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if(error == QNetworkReply::OperationCanceledError)
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{
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qCritical() << "Aborted " << m_url.toString();
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m_status = Job_Aborted;
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}
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else
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{
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if(m_options & Option::AcceptLocalFiles)
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{
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if(m_sink->hasLocalData())
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{
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m_status = Job_Failed_Proceed;
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return;
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}
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}
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// error happened during download.
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qCritical() << "Failed " << m_url.toString() << " with reason " << error;
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m_status = Job_Failed;
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}
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}
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void Download::sslErrors(const QList<QSslError> & errors)
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{
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int i = 1;
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for (auto error : errors)
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{
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qCritical() << "Download" << m_url.toString() << "SSL Error #" << i << " : " << error.errorString();
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auto cert = error.certificate();
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qCritical() << "Certificate in question:\n" << cert.toText();
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i++;
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}
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}
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bool Download::handleRedirect()
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{
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QUrl redirect = m_reply->header(QNetworkRequest::LocationHeader).toUrl();
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if(!redirect.isValid())
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{
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if(!m_reply->hasRawHeader("Location"))
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{
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// no redirect -> it's fine to continue
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return false;
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}
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// there is a Location header, but it's not correct. we need to apply some workarounds...
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QByteArray redirectBA = m_reply->rawHeader("Location");
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if(redirectBA.size() == 0)
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{
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// empty, yet present redirect header? WTF?
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return false;
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}
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QString redirectStr = QString::fromUtf8(redirectBA);
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if(redirectStr.startsWith("//"))
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{
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/*
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* IF the URL begins with //, we need to insert the URL scheme.
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* See: https://bugreports.qt.io/browse/QTBUG-41061
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* See: http://tools.ietf.org/html/rfc3986#section-4.2
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*/
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redirectStr = m_reply->url().scheme() + ":" + redirectStr;
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}
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else if(redirectStr.startsWith("/"))
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{
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/*
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* IF the URL begins with /, we need to process it as a relative URL
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*/
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auto url = m_reply->url();
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url.setPath(redirectStr, QUrl::TolerantMode);
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redirectStr = url.toString();
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}
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/*
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* Next, make sure the URL is parsed in tolerant mode. Qt doesn't parse the location header in tolerant mode, which causes issues.
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* FIXME: report Qt bug for this
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*/
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redirect = QUrl(redirectStr, QUrl::TolerantMode);
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if(!redirect.isValid())
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{
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qWarning() << "Failed to parse redirect URL:" << redirectStr;
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downloadError(QNetworkReply::ProtocolFailure);
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return false;
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}
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qDebug() << "Fixed location header:" << redirect;
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}
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else
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{
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qDebug() << "Location header:" << redirect;
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}
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m_url = QUrl(redirect.toString());
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qDebug() << "Following redirect to " << m_url.toString();
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start(m_network);
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return true;
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}
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void Download::downloadFinished()
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{
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// handle HTTP redirection first
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if(handleRedirect())
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{
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qDebug() << "Download redirected:" << m_url.toString();
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return;
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}
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// if the download failed before this point ...
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if (m_status == Job_Failed_Proceed)
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{
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qDebug() << "Download failed but we are allowed to proceed:" << m_url.toString();
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m_sink->abort();
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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 if (m_status == Job_Failed)
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{
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qDebug() << "Download failed in previous step:" << m_url.toString();
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m_sink->abort();
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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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else if(m_status == Job_Aborted)
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{
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qDebug() << "Download aborted in previous step:" << m_url.toString();
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m_sink->abort();
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m_reply.reset();
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emit aborted(m_index_within_job);
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return;
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}
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// make sure we got all the remaining data, if any
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auto data = m_reply->readAll();
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if(data.size())
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{
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qDebug() << "Writing extra" << data.size() << "bytes to" << m_target_path;
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m_status = m_sink->write(data);
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}
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// otherwise, finalize the whole graph
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m_status = m_sink->finalize(*m_reply.get());
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if (m_status != Job_Finished)
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{
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qDebug() << "Download failed to finalize:" << m_url.toString();
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m_sink->abort();
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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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m_reply.reset();
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qDebug() << "Download succeeded:" << m_url.toString();
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emit succeeded(m_index_within_job);
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}
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void Download::downloadReadyRead()
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{
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if(m_status == Job_InProgress)
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{
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auto data = m_reply->readAll();
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m_status = m_sink->write(data);
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if(m_status == Job_Failed)
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{
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qCritical() << "Failed to process response chunk for " << m_target_path;
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}
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// qDebug() << "Download" << m_url.toString() << "gained" << data.size() << "bytes";
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}
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else
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{
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qCritical() << "Cannot write to " << m_target_path << ", illegal status" << m_status;
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}
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}
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}
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bool Net::Download::abort()
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{
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if(m_reply)
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{
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m_reply->abort();
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}
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else
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{
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m_status = Job_Aborted;
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}
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return true;
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}
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bool Net::Download::canAbort()
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{
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return true;
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}
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