sneedmc/launcher/net/Download.cpp

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// SPDX-License-Identifier: GPL-3.0-only
/*
* PolyMC - Minecraft Launcher
* Copyright (c) 2022 flowln <flowlnlnln@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2013-2021 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 "Download.h"
#include <QDateTime>
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#include <QFileInfo>
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#include "ByteArraySink.h"
#include "ChecksumValidator.h"
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#include "FileSystem.h"
#include "MetaCacheSink.h"
#include "BuildConfig.h"
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#include "Application.h"
namespace Net {
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Download::Download() : NetAction()
{
m_state = State::Inactive;
}
auto Download::makeCached(QUrl url, MetaEntryPtr entry, Options options) -> Download::Ptr
{
auto* dl = new Download();
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dl->m_url = url;
dl->m_options = options;
auto md5Node = new ChecksumValidator(QCryptographicHash::Md5);
auto cachedNode = new MetaCacheSink(entry, md5Node);
dl->m_sink.reset(cachedNode);
return dl;
}
auto Download::makeByteArray(QUrl url, QByteArray* output, Options options) -> Download::Ptr
{
auto* dl = new Download();
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dl->m_url = url;
dl->m_options = options;
dl->m_sink.reset(new ByteArraySink(output));
return dl;
}
auto Download::makeFile(QUrl url, QString path, Options options) -> Download::Ptr
{
auto* dl = new Download();
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dl->m_url = url;
dl->m_options = options;
dl->m_sink.reset(new FileSink(path));
return dl;
}
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void Download::addValidator(Validator* v)
{
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m_sink->addValidator(v);
}
void Download::executeTask()
{
setStatus(tr("Downloading %1").arg(m_url.toString()));
if (getState() == Task::State::AbortedByUser) {
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qWarning() << "Attempt to start an aborted Download:" << m_url.toString();
emitAborted();
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return;
}
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QNetworkRequest request(m_url);
m_state = m_sink->init(request);
switch (m_state) {
case State::Succeeded:
emit succeeded();
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qDebug() << "Download cache hit " << m_url.toString();
return;
case State::Running:
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qDebug() << "Downloading " << m_url.toString();
break;
case State::Inactive:
case State::Failed:
emitFailed();
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return;
case State::AbortedByUser:
emitAborted();
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return;
}
request.setHeader(QNetworkRequest::UserAgentHeader, BuildConfig.USER_AGENT);
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if (request.url().host().contains("api.curseforge.com")) {
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request.setRawHeader("x-api-key", APPLICATION->getCurseKey().toUtf8());
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};
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QNetworkReply* rep = m_network->get(request);
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m_reply.reset(rep);
connect(rep, &QNetworkReply::downloadProgress, this, &Download::downloadProgress);
connect(rep, &QNetworkReply::finished, this, &Download::downloadFinished);
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connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), SLOT(downloadError(QNetworkReply::NetworkError)));
connect(rep, &QNetworkReply::sslErrors, this, &Download::sslErrors);
connect(rep, &QNetworkReply::readyRead, this, &Download::downloadReadyRead);
}
void Download::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
setProgress(bytesReceived, bytesTotal);
}
void Download::downloadError(QNetworkReply::NetworkError error)
{
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if (error == QNetworkReply::OperationCanceledError) {
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qCritical() << "Aborted " << m_url.toString();
m_state = State::AbortedByUser;
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} else {
if (m_options & Option::AcceptLocalFiles) {
if (m_sink->hasLocalData()) {
m_state = State::Succeeded;
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return;
}
}
// error happened during download.
qCritical() << "Failed " << m_url.toString() << " with reason " << error;
m_state = State::Failed;
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}
}
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void Download::sslErrors(const QList<QSslError>& errors)
{
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int i = 1;
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for (auto error : errors) {
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qCritical() << "Download" << m_url.toString() << "SSL Error #" << i << " : " << error.errorString();
auto cert = error.certificate();
qCritical() << "Certificate in question:\n" << cert.toText();
i++;
}
}
auto Download::handleRedirect() -> bool
{
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QUrl redirect = m_reply->header(QNetworkRequest::LocationHeader).toUrl();
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if (!redirect.isValid()) {
if (!m_reply->hasRawHeader("Location")) {
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// no redirect -> it's fine to continue
return false;
}
// there is a Location header, but it's not correct. we need to apply some workarounds...
QByteArray redirectBA = m_reply->rawHeader("Location");
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if (redirectBA.size() == 0) {
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// empty, yet present redirect header? WTF?
return false;
}
QString redirectStr = QString::fromUtf8(redirectBA);
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if (redirectStr.startsWith("//")) {
/*
* IF the URL begins with //, we need to insert the URL scheme.
* See: https://bugreports.qt.io/browse/QTBUG-41061
* See: http://tools.ietf.org/html/rfc3986#section-4.2
*/
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redirectStr = m_reply->url().scheme() + ":" + redirectStr;
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} else if (redirectStr.startsWith("/")) {
/*
* IF the URL begins with /, we need to process it as a relative URL
*/
auto url = m_reply->url();
url.setPath(redirectStr, QUrl::TolerantMode);
redirectStr = url.toString();
}
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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.
* FIXME: report Qt bug for this
*/
redirect = QUrl(redirectStr, QUrl::TolerantMode);
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if (!redirect.isValid()) {
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qWarning() << "Failed to parse redirect URL:" << redirectStr;
downloadError(QNetworkReply::ProtocolFailure);
return false;
}
qDebug() << "Fixed location header:" << redirect;
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} else {
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qDebug() << "Location header:" << redirect;
}
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m_url = QUrl(redirect.toString());
qDebug() << "Following redirect to " << m_url.toString();
startAction(m_network);
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return true;
}
void Download::downloadFinished()
{
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// handle HTTP redirection first
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if (handleRedirect()) {
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qDebug() << "Download redirected:" << m_url.toString();
return;
}
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// if the download failed before this point ...
if (m_state == State::Succeeded) // pretend to succeed so we continue processing :)
{
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qDebug() << "Download failed but we are allowed to proceed:" << m_url.toString();
m_sink->abort();
m_reply.reset();
emit succeeded();
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return;
} else if (m_state == State::Failed) {
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qDebug() << "Download failed in previous step:" << m_url.toString();
m_sink->abort();
m_reply.reset();
emit failed("");
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return;
} else if (m_state == State::AbortedByUser) {
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qDebug() << "Download aborted in previous step:" << m_url.toString();
m_sink->abort();
m_reply.reset();
emit aborted();
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return;
}
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// make sure we got all the remaining data, if any
auto data = m_reply->readAll();
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if (data.size()) {
qDebug() << "Writing extra" << data.size() << "bytes";
m_state = m_sink->write(data);
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}
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// otherwise, finalize the whole graph
m_state = m_sink->finalize(*m_reply.get());
if (m_state != State::Succeeded) {
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qDebug() << "Download failed to finalize:" << m_url.toString();
m_sink->abort();
m_reply.reset();
emit failed("");
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return;
}
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m_reply.reset();
qDebug() << "Download succeeded:" << m_url.toString();
emit succeeded();
}
void Download::downloadReadyRead()
{
if (m_state == State::Running) {
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auto data = m_reply->readAll();
m_state = m_sink->write(data);
if (m_state == State::Failed) {
qCritical() << "Failed to process response chunk";
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}
// qDebug() << "Download" << m_url.toString() << "gained" << data.size() << "bytes";
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} else {
qCritical() << "Cannot write download data! illegal status " << m_status;
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}
}
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} // namespace Net
auto Net::Download::abort() -> bool
{
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if (m_reply) {
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m_reply->abort();
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} else {
m_state = State::AbortedByUser;
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}
return true;
}