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#include "DownloadJob.h"
#include "pathutils.h"
#include "NetWorker.h"
DownloadJob::DownloadJob (QUrl url,
QString target_path,
QString expected_md5 )
:Job()
{
m_url = url;
m_target_path = target_path;
m_expected_md5 = expected_md5;
m_check_md5 = m_expected_md5.size();
m_save_to_file = m_target_path.size();
m_status = Job_NotStarted;
m_opened_for_saving = false;
}
JobPtr DownloadJob::create (QUrl url,
QString target_path,
QString expected_md5 )
{
return JobPtr ( new DownloadJob ( url, target_path, expected_md5 ) );
}
void DownloadJob::start()
{
if ( m_save_to_file )
{
QString filename = m_target_path;
m_output_file.setFileName ( filename );
// if there already is a file and md5 checking is in effect and it can be opened
if ( m_output_file.exists() && m_output_file.open ( QIODevice::ReadOnly ) )
{
// check the md5 against the expected one
QString hash = QCryptographicHash::hash ( m_output_file.readAll(), QCryptographicHash::Md5 ).toHex().constData();
m_output_file.close();
// skip this file if they match
if ( m_check_md5 && hash == m_expected_md5 )
{
qDebug() << "Skipping " << m_url.toString() << ": md5 match.";
emit finish();
return;
}
else
{
m_expected_md5 = hash;
}
}
if(!ensureFilePathExists(filename))
{
emit fail();
return;
}
}
qDebug() << "Downloading " << m_url.toString();
QNetworkRequest request ( m_url );
request.setRawHeader(QString("If-None-Match").toLatin1(), m_expected_md5.toLatin1());
auto &worker = NetWorker::spawn();
QNetworkReply * rep = worker.get ( request );
m_reply = QSharedPointer<QNetworkReply> ( rep, &QObject::deleteLater );
connect ( rep, SIGNAL ( downloadProgress ( qint64,qint64 ) ), SLOT ( downloadProgress ( qint64,qint64 ) ) );
connect ( rep, SIGNAL ( finished() ), SLOT ( downloadFinished() ) );
connect ( rep, SIGNAL ( error ( QNetworkReply::NetworkError ) ), SLOT ( downloadError ( QNetworkReply::NetworkError ) ) );
connect ( rep, SIGNAL ( readyRead() ), SLOT ( downloadReadyRead() ) );
}
void DownloadJob::downloadProgress ( qint64 bytesReceived, qint64 bytesTotal )
{
emit progress ( bytesReceived, bytesTotal );
}
void DownloadJob::downloadError ( QNetworkReply::NetworkError error )
{
// error happened during download.
// TODO: log the reason why
m_status = Job_Failed;
}
void DownloadJob::downloadFinished()
{
// if the download succeeded
if ( m_status != Job_Failed )
{
// nothing went wrong...
m_status = Job_Finished;
// save the data to the downloadable if we aren't saving to file
if ( !m_save_to_file )
{
m_data = m_reply->readAll();
}
else
{
m_output_file.close();
}
//TODO: check md5 here!
m_reply.clear();
emit finish();
return;
}
// else the download failed
else
{
if ( m_save_to_file )
{
m_output_file.close();
m_output_file.remove();
}
m_reply.clear();
emit fail();
return;
}
}
void DownloadJob::downloadReadyRead()
{
if( m_save_to_file )
{
if(!m_opened_for_saving)
{
if ( !m_output_file.open ( QIODevice::WriteOnly ) )
{
/*
* Can't open the file... the job failed
*/
m_reply->abort();
emit fail();
return;
}
m_opened_for_saving = true;
}
m_output_file.write ( m_reply->readAll() );
}
}
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