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// SPDX-FileCopyrightText: 2018 Kitsune Ral <Kitsune-Ral@users.sf.net>
// SPDX-License-Identifier: LGPL-2.1-or-later
#include "downloadfilejob.h"
#include <QtCore/QFile>
#include <QtCore/QTemporaryFile>
#include <QtNetwork/QNetworkReply>
#ifdef Quotient_E2EE_ENABLED
# include "events/filesourceinfo.h"
# include <QtCore/QCryptographicHash>
#endif
using namespace Quotient;
class DownloadFileJob::Private {
public:
Private() : tempFile(new QTemporaryFile()) {}
explicit Private(const QString& localFilename)
: targetFile(new QFile(localFilename))
, tempFile(new QFile(targetFile->fileName() + ".qtntdownload"))
{}
QScopedPointer<QFile> targetFile;
QScopedPointer<QFile> tempFile;
#ifdef Quotient_E2EE_ENABLED
Omittable<EncryptedFileMetadata> encryptedFileMetadata;
#endif
};
QUrl DownloadFileJob::makeRequestUrl(QUrl baseUrl, const QUrl& mxcUri)
{
return makeRequestUrl(std::move(baseUrl), mxcUri.authority(),
mxcUri.path().mid(1));
}
DownloadFileJob::DownloadFileJob(const QString& serverName,
const QString& mediaId,
const QString& localFilename)
: GetContentJob(serverName, mediaId)
, d(localFilename.isEmpty() ? makeImpl<Private>()
: makeImpl<Private>(localFilename))
{
setObjectName(QStringLiteral("DownloadFileJob"));
}
#ifdef Quotient_E2EE_ENABLED
DownloadFileJob::DownloadFileJob(const QString& serverName,
const QString& mediaId,
const EncryptedFileMetadata& file,
const QString& localFilename)
: GetContentJob(serverName, mediaId)
, d(localFilename.isEmpty() ? makeImpl<Private>()
: makeImpl<Private>(localFilename))
{
setObjectName(QStringLiteral("DownloadFileJob"));
d->encryptedFileMetadata = file;
}
#endif
QString DownloadFileJob::targetFileName() const
{
return (d->targetFile ? d->targetFile : d->tempFile)->fileName();
}
void DownloadFileJob::doPrepare()
{
if (d->targetFile && !d->targetFile->isReadable()
&& !d->targetFile->open(QIODevice::WriteOnly)) {
qCWarning(JOBS) << "Couldn't open the file" << d->targetFile->fileName()
<< "for writing";
setStatus(FileError, "Could not open the target file for writing");
return;
}
if (!d->tempFile->isReadable() && !d->tempFile->open(QIODevice::ReadWrite)) {
qCWarning(JOBS) << "Couldn't open the temporary file"
<< d->tempFile->fileName() << "for writing";
setStatus(FileError, "Could not open the temporary download file");
return;
}
qCDebug(JOBS) << "Downloading to" << d->tempFile->fileName();
}
void DownloadFileJob::onSentRequest(QNetworkReply* reply)
{
connect(reply, &QNetworkReply::metaDataChanged, this, [this, reply] {
if (!status().good())
return;
auto sizeHeader = reply->header(QNetworkRequest::ContentLengthHeader);
if (sizeHeader.isValid()) {
auto targetSize = sizeHeader.toLongLong();
if (targetSize != -1)
if (!d->tempFile->resize(targetSize)) {
qCWarning(JOBS) << "Failed to allocate" << targetSize
<< "bytes for" << d->tempFile->fileName();
setStatus(FileError,
"Could not reserve disk space for download");
}
}
});
connect(reply, &QIODevice::readyRead, this, [this, reply] {
if (!status().good())
return;
auto bytes = reply->read(reply->bytesAvailable());
if (!bytes.isEmpty())
d->tempFile->write(bytes);
else
qCWarning(JOBS) << "Unexpected empty chunk when downloading from"
<< reply->url() << "to" << d->tempFile->fileName();
});
}
void DownloadFileJob::beforeAbandon()
{
if (d->targetFile)
d->targetFile->remove();
d->tempFile->remove();
}
void decryptFile(QFile& sourceFile, const EncryptedFileMetadata& metadata,
QFile& targetFile)
{
sourceFile.seek(0);
const auto encrypted = sourceFile.readAll(); // TODO: stream decryption
const auto decrypted = decryptFile(encrypted, metadata);
targetFile.write(decrypted);
}
BaseJob::Status DownloadFileJob::prepareResult()
{
if (d->targetFile) {
#ifdef Quotient_E2EE_ENABLED
if (d->encryptedFileMetadata.has_value()) {
decryptFile(*d->tempFile, *d->encryptedFileMetadata, *d->targetFile);
d->tempFile->remove();
} else {
#endif
d->targetFile->close();
if (!d->targetFile->remove()) {
qWarning(JOBS) << "Failed to remove the target file placeholder";
return { FileError, "Couldn't finalise the download" };
}
if (!d->tempFile->rename(d->targetFile->fileName())) {
qWarning(JOBS) << "Failed to rename" << d->tempFile->fileName()
<< "to" << d->targetFile->fileName();
return { FileError, "Couldn't finalise the download" };
}
#ifdef Quotient_E2EE_ENABLED
}
#endif
} else {
#ifdef Quotient_E2EE_ENABLED
if (d->encryptedFileMetadata.has_value()) {
QTemporaryFile tempTempFile; // Assuming it to be next to tempFile
decryptFile(*d->tempFile, *d->encryptedFileMetadata, tempTempFile);
d->tempFile->close();
if (!d->tempFile->remove()) {
qWarning(JOBS)
<< "Failed to remove the decrypted file placeholder";
return { FileError, "Couldn't finalise the download" };
}
if (!tempTempFile.rename(d->tempFile->fileName())) {
qWarning(JOBS) << "Failed to rename" << tempTempFile.fileName()
<< "to" << d->tempFile->fileName();
return { FileError, "Couldn't finalise the download" };
}
} else {
#endif
d->tempFile->close();
#ifdef Quotient_E2EE_ENABLED
}
#endif
}
qDebug(JOBS) << "Saved a file as" << targetFileName();
return Success;
}
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