1 files changed, 127 insertions, 0 deletions
diff --git a/logic/net/CacheDownload.cpp b/logic/net/CacheDownload.cpp
new file mode 100644
index 00000000..dc2e0448
--- /dev/null
+++ b/logic/net/CacheDownload.cpp
@@ -0,0 +1,127 @@
+#include "MultiMC.h"
+#include "CacheDownload.h"
+#include <pathutils.h>
+
+#include <QCryptographicHash>
+#include <QFileInfo>
+#include <QDateTime>
+#include <QDebug>
+
+CacheDownload::CacheDownload(QUrl url, MetaEntryPtr entry)
+	: Download(), md5sum(QCryptographicHash::Md5)
+{
+	m_url = url;
+	m_entry = entry;
+	m_target_path = entry->getFullPath();
+	m_status = Job_NotStarted;
+	m_opened_for_saving = false;
+}
+
+void CacheDownload::start()
+{
+	if (!m_entry->stale)
+	{
+		emit succeeded(index_within_job);
+		return;
+	}
+	m_output_file.setFileName(m_target_path);
+	// if there already is a file and md5 checking is in effect and it can be opened
+	if (!ensureFilePathExists(m_target_path))
+	{
+		emit failed(index_within_job);
+		return;
+	}
+	qDebug() << "Downloading " << m_url.toString();
+	QNetworkRequest request(m_url);
+	request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->etag.toLatin1());
+
+	auto worker = MMC->qnam();
+	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 CacheDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+	emit progress(index_within_job, bytesReceived, bytesTotal);
+}
+
+void CacheDownload::downloadError(QNetworkReply::NetworkError error)
+{
+	// error happened during download.
+	// TODO: log the reason why
+	m_status = Job_Failed;
+}
+void CacheDownload::downloadFinished()
+{
+	// if the download succeeded
+	if (m_status != Job_Failed)
+	{
+
+		// nothing went wrong...
+		m_status = Job_Finished;
+		if (m_opened_for_saving)
+		{
+			// save the data to the downloadable if we aren't saving to file
+			m_output_file.close();
+			m_entry->md5sum = md5sum.result().toHex().constData();
+		}
+		else
+		{
+			if (m_output_file.open(QIODevice::ReadOnly))
+			{
+				m_entry->md5sum =
+					QCryptographicHash::hash(m_output_file.readAll(), QCryptographicHash::Md5)
+						.toHex()
+						.constData();
+				m_output_file.close();
+			}
+		}
+		QFileInfo output_file_info(m_target_path);
+
+		m_entry->etag = m_reply->rawHeader("ETag").constData();
+		m_entry->last_changed_timestamp =
+			output_file_info.lastModified().toUTC().toMSecsSinceEpoch();
+		m_entry->stale = false;
+		MMC->metacache()->updateEntry(m_entry);
+
+		m_reply.clear();
+		emit succeeded(index_within_job);
+		return;
+	}
+	// else the download failed
+	else
+	{
+		m_output_file.close();
+		m_output_file.remove();
+		m_reply.clear();
+		emit failed(index_within_job);
+		return;
+	}
+}
+
+void CacheDownload::downloadReadyRead()
+{
+	if (!m_opened_for_saving)
+	{
+		if (!m_output_file.open(QIODevice::WriteOnly))
+		{
+			/*
+			* Can't open the file... the job failed
+			*/
+			m_reply->abort();
+			emit failed(index_within_job);
+			return;
+		}
+		m_opened_for_saving = true;
+	}
+	QByteArray ba = m_reply->readAll();
+	md5sum.addData(ba);
+	m_output_file.write(ba);
+}