1 files changed, 138 insertions, 0 deletions
diff --git a/backend/net/DownloadJob.cpp b/backend/net/DownloadJob.cpp
new file mode 100644
index 00000000..ef842dfd
--- /dev/null
+++ b/backend/net/DownloadJob.cpp
@@ -0,0 +1,138 @@
+#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(!ensurePathExists(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() );
+	}
+}