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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 <QCryptographicHash>
# include <openssl/evp.h>
QByteArray decrypt(const QByteArray &ciphertext, const QByteArray &key, const QByteArray &iv)
{
QByteArray plaintext(ciphertext.size(), 0);
EVP_CIPHER_CTX *ctx;
int length;
ctx = EVP_CIPHER_CTX_new();
EVP_DecryptInit_ex(ctx, EVP_aes_256_ctr(), NULL, (const unsigned char *)key.data(), (const unsigned char *)iv.data());
EVP_DecryptUpdate(ctx, (unsigned char *)plaintext.data(), &length, (const unsigned char *)ciphertext.data(), ciphertext.size());
EVP_DecryptFinal_ex(ctx, (unsigned char *)plaintext.data() + length, &length);
EVP_CIPHER_CTX_free(ctx);
return plaintext;
}
#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
QByteArray key;
QByteArray iv;
QByteArray sha256;
#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() ? new Private : new Private(localFilename))
{
setObjectName(QStringLiteral("DownloadFileJob"));
}
#ifdef Quotient_E2EE_ENABLED
DownloadFileJob::DownloadFileJob(const QString& serverName,
const QString& mediaId,
const QString& key,
const QString& iv,
const QString& sha256,
const QString& localFilename)
: GetContentJob(serverName, mediaId)
, d(localFilename.isEmpty() ? new Private : new Private(localFilename))
{
setObjectName(QStringLiteral("DownloadFileJob"));
auto _key = key;
d->key = QByteArray::fromBase64(_key.replace(QLatin1Char('_'), QLatin1Char('/')).replace(QLatin1Char('-'), QLatin1Char('+')).toLatin1());
d->iv = QByteArray::fromBase64(iv.toLatin1());
d->sha256 = QByteArray::fromBase64(sha256.toLatin1());
}
#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();
}
BaseJob::Status DownloadFileJob::prepareResult()
{
if (d->targetFile) {
#ifdef Quotient_E2EE_ENABLED
if(d->key.size() != 0) {
d->tempFile->seek(0);
QByteArray encrypted = d->tempFile->readAll();
if(d->sha256 != QCryptographicHash::hash(encrypted, QCryptographicHash::Sha256)) {
qCWarning(E2EE) << "Hash verification failed for file";
return IncorrectResponse;
}
auto decrypted = decrypt(encrypted, d->key, d->iv);
d->targetFile->write(decrypted);
d->targetFile->remove();
} else {
#endif
d->targetFile->close();
if (!d->targetFile->remove()) {
qCWarning(JOBS) << "Failed to remove the target file placeholder";
return { FileError, "Couldn't finalise the download" };
}
if (!d->tempFile->rename(d->targetFile->fileName())) {
qCWarning(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->key.size() != 0) {
d->tempFile->seek(0);
auto encrypted = d->tempFile->readAll();
if(d->sha256 != QCryptographicHash::hash(encrypted, QCryptographicHash::Sha256)) {
qCWarning(E2EE) << "Hash verification failed for file";
return IncorrectResponse;
}
auto decrypted = decrypt(encrypted, d->key, d->iv);
d->tempFile->write(decrypted);
} else {
#endif
d->tempFile->close();
#ifdef Quotient_E2EE_ENABLED
}
#endif
}
qCDebug(JOBS) << "Saved a file as" << targetFileName();
return Success;
}
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