From 3f5c46a1c4b27e82976e0067e4ec2d6abfffd9ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= <peterix@gmail.com>
Date: Tue, 10 Dec 2013 07:12:52 +0100
Subject: Finish assets update for 1.7.3

---
 logic/net/MD5EtagDownload.cpp | 129 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 logic/net/MD5EtagDownload.cpp

(limited to 'logic/net/MD5EtagDownload.cpp')

diff --git a/logic/net/MD5EtagDownload.cpp b/logic/net/MD5EtagDownload.cpp
new file mode 100644
index 00000000..7b77bfbf
--- /dev/null
+++ b/logic/net/MD5EtagDownload.cpp
@@ -0,0 +1,129 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MultiMC.h"
+#include "MD5EtagDownload.h"
+#include <pathutils.h>
+#include <QCryptographicHash>
+#include "logger/QsLog.h"
+
+MD5EtagDownload::MD5EtagDownload(QUrl url, QString target_path) : NetAction()
+{
+	m_url = url;
+	m_target_path = target_path;
+	m_check_md5 = false;
+	m_status = Job_NotStarted;
+}
+
+void MD5EtagDownload::start()
+{
+	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)
+		{
+			QLOG_INFO() << "Skipping " << m_url.toString() << ": md5 match.";
+			emit succeeded(index_within_job);
+			return;
+		}
+		else
+		{
+			m_expected_md5 = hash;
+		}
+	}
+	if (!ensureFilePathExists(filename))
+	{
+		emit failed(index_within_job);
+		return;
+	}
+
+	QLOG_INFO() << "Downloading " << m_url.toString() << " expecting " << m_expected_md5;
+	QNetworkRequest request(m_url);
+	request.setRawHeader(QString("If-None-Match").toLatin1(), m_expected_md5.toLatin1());
+	request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
+
+	auto worker = MMC->qnam();
+	QNetworkReply *rep = worker->get(request);
+
+	m_reply = std::shared_ptr<QNetworkReply>(rep);
+	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 MD5EtagDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+	emit progress(index_within_job, bytesReceived, bytesTotal);
+}
+
+void MD5EtagDownload::downloadError(QNetworkReply::NetworkError error)
+{
+	// error happened during download.
+	// TODO: log the reason why
+	m_status = Job_Failed;
+}
+
+void MD5EtagDownload::downloadFinished()
+{
+	// if the download succeeded
+	if (m_status != Job_Failed)
+	{
+		// nothing went wrong...
+		m_status = Job_Finished;
+		m_output_file.close();
+
+		QLOG_INFO() << "Finished " << m_url.toString() << " got " << m_reply->rawHeader("ETag").constData();
+		m_reply.reset();
+		emit succeeded(index_within_job);
+		return;
+	}
+	// else the download failed
+	else
+	{
+		m_output_file.close();
+		m_reply.reset();
+		emit failed(index_within_job);
+		return;
+	}
+}
+
+void MD5EtagDownload::downloadReadyRead()
+{
+	if (!m_output_file.isOpen())
+	{
+		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_output_file.write(m_reply->readAll());
+}
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