1 files changed, 398 insertions, 0 deletions
diff --git a/logic/updater/DownloadUpdateTask.cpp b/logic/updater/DownloadUpdateTask.cpp
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+++ b/logic/updater/DownloadUpdateTask.cpp
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+/* 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 "DownloadUpdateTask.h"
+
+#include "MultiMC.h"
+#include "logic/updater/UpdateChecker.h"
+#include "logic/net/NetJob.h"
+#include "pathutils.h"
+
+#include <QFile>
+#include <QTemporaryDir>
+#include <QCryptographicHash>
+
+#include <QDomDocument>
+
+
+DownloadUpdateTask::DownloadUpdateTask(QString repoUrl, int versionId, QObject* parent) :
+	Task(parent)
+{
+	m_cVersionId = MMC->version().build;
+
+	m_nRepoUrl = repoUrl;
+	m_nVersionId = versionId;
+
+	m_updateFilesDir.setAutoRemove(false);
+}
+
+void DownloadUpdateTask::executeTask()
+{
+	// GO!
+	// This will call the next step when it's done.
+	findCurrentVersionInfo();
+}
+
+void DownloadUpdateTask::findCurrentVersionInfo()
+{
+	setStatus(tr("Finding information about the current version."));
+
+	auto checker = MMC->updateChecker();
+
+	// This runs after we've tried loading the channel list.
+	// If the channel list doesn't need to be loaded, this will be called immediately.
+	// If the channel list does need to be loaded, this will be called when it's done.
+	auto processFunc = [this, &checker] () -> void
+	{
+		// Now, check the channel list again.
+		if (checker->hasChannels())
+		{ 
+			// We still couldn't load the channel list. Give up. Call loadVersionInfo and return.
+			QLOG_INFO() << "Reloading the channel list didn't work. Giving up.";
+			loadVersionInfo();
+			return;
+		}
+
+		QList<UpdateChecker::ChannelListEntry> channels = checker->getChannelList();
+		QString channelId = MMC->version().channel;
+
+		// Search through the channel list for a channel with the correct ID.
+		for (auto channel : channels)
+		{
+			if (channel.id == channelId)
+			{
+				QLOG_INFO() << "Found matching channel.";
+				m_cRepoUrl = channel.url;
+				break;
+			}
+		}
+
+		// Now that we've done that, load version info.
+		loadVersionInfo();
+	};
+
+	if (checker->hasChannels())
+	{
+		// Load the channel list and wait for it to finish loading.
+		QLOG_INFO() << "No channel list entries found. Will try reloading it.";
+
+		QObject::connect(checker.get(), &UpdateChecker::channelListLoaded, processFunc);
+		checker->updateChanList();
+	}
+	else
+	{
+		processFunc();
+	}
+}
+
+void DownloadUpdateTask::loadVersionInfo()
+{
+	setStatus(tr("Loading version information."));
+
+	// Create the net job for loading version info.
+	NetJob* netJob = new NetJob("Version Info");
+	
+	// Find the index URL.
+	QUrl newIndexUrl = QUrl(m_nRepoUrl).resolved(QString::number(m_nVersionId) + ".json");
+	
+	// Add a net action to download the version info for the version we're updating to.
+	netJob->addNetAction(ByteArrayDownload::make(newIndexUrl));
+
+	// If we have a current version URL, get that one too.
+	if (!m_cRepoUrl.isEmpty())
+	{
+		QUrl cIndexUrl = QUrl(m_cRepoUrl).resolved(QString::number(m_cVersionId) + ".json");
+		netJob->addNetAction(ByteArrayDownload::make(cIndexUrl));
+	}
+
+	// Connect slots so we know when it's done.
+	QObject::connect(netJob, &NetJob::succeeded, this, &DownloadUpdateTask::vinfoDownloadFinished);
+	QObject::connect(netJob, &NetJob::failed, this, &DownloadUpdateTask::vinfoDownloadFailed);
+
+	// Store the NetJob in a class member. We don't want to lose it!
+	m_vinfoNetJob.reset(netJob);
+
+	// Finally, we start the network job and the thread's event loop to wait for it to finish.
+	netJob->start();
+}
+
+void DownloadUpdateTask::vinfoDownloadFinished()
+{
+	// Both downloads succeeded. OK. Parse stuff.
+	parseDownloadedVersionInfo();
+}
+
+void DownloadUpdateTask::vinfoDownloadFailed()
+{
+	// Something failed. We really need the second download (current version info), so parse downloads anyways as long as the first one succeeded.
+	if (m_vinfoNetJob->first()->m_status != Job_Failed)
+	{
+		parseDownloadedVersionInfo();
+		return;
+	}
+
+	// TODO: Give a more detailed error message.
+	QLOG_ERROR() << "Failed to download version info files.";
+	emitFailed(tr("Failed to download version info files."));
+}
+
+void DownloadUpdateTask::parseDownloadedVersionInfo()
+{
+	setStatus(tr("Reading file lists."));
+
+	parseVersionInfo(NEW_VERSION, &m_nVersionFileList);
+
+	// If there is a second entry in the network job's list, load it as the current version's info.
+	if (m_vinfoNetJob->size() >= 2 && m_vinfoNetJob->operator[](1)->m_status != Job_Failed)
+	{
+		parseVersionInfo(CURRENT_VERSION, &m_cVersionFileList);
+	}
+
+	// We don't need this any more.
+	m_vinfoNetJob.reset();
+
+	// Now that we're done loading version info, we can move on to the next step. Process file lists and download files.
+	processFileLists();
+}
+
+void DownloadUpdateTask::parseVersionInfo(VersionInfoFileEnum vfile, VersionFileList* list)
+{
+	if (vfile == CURRENT_VERSION)  setStatus(tr("Reading file list for current version."));
+	else if (vfile == NEW_VERSION) setStatus(tr("Reading file list for new version."));
+
+	QLOG_DEBUG() << "Reading file list for" << (vfile == NEW_VERSION ? "new" : "current") << "version.";
+	
+	QByteArray data;
+	{
+		ByteArrayDownloadPtr dl = std::dynamic_pointer_cast<ByteArrayDownload>(
+				vfile == NEW_VERSION ? m_vinfoNetJob->first() : m_vinfoNetJob->operator[](1));
+		data = dl->m_data;
+	}
+
+	QJsonParseError jsonError;
+	QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
+	if (jsonError.error != QJsonParseError::NoError)
+	{
+		QLOG_ERROR() << "Failed to parse version info JSON:" << jsonError.errorString() << "at" << jsonError.offset;
+		return;
+	}
+
+	QJsonObject json = jsonDoc.object();
+
+	QLOG_DEBUG() << "Loading version info from JSON.";
+	QJsonArray filesArray = json.value("Files").toArray();
+	for (QJsonValue fileValue : filesArray)
+	{
+		QJsonObject fileObj = fileValue.toObject();
+
+		VersionFileEntry file{
+			fileObj.value("Path").toString(),
+			fileObj.value("Perms").toVariant().toInt(),
+			FileSourceList(),
+			fileObj.value("MD5").toString(),
+		};
+		QLOG_DEBUG() << "File" << file.path << "with perms" << file.mode;
+		
+		QJsonArray sourceArray = fileObj.value("Sources").toArray();
+		for (QJsonValue val : sourceArray)
+		{
+			QJsonObject sourceObj = val.toObject();
+
+			QString type = sourceObj.value("SourceType").toString();
+			if (type == "http")
+			{
+				file.sources.append(FileSource("http", sourceObj.value("Url").toString()));
+			}
+			else if (type == "httpc")
+			{
+				file.sources.append(FileSource("httpc", sourceObj.value("Url").toString(), sourceObj.value("CompressionType").toString()));
+			}
+			else
+			{
+				QLOG_WARN() << "Unknown source type" << type << "ignored.";
+			}
+		}
+
+		QLOG_DEBUG() << "Loaded info for" << file.path;
+
+		list->append(file);
+	}
+}
+
+void DownloadUpdateTask::processFileLists()
+{
+	setStatus(tr("Processing file lists. Figuring out how to install the update."));
+
+	// First, if we've loaded the current version's file list, we need to iterate through it and 
+	// delete anything in the current one version's list that isn't in the new version's list.
+	for (VersionFileEntry entry : m_cVersionFileList)
+	{
+		for (VersionFileEntry newEntry : m_nVersionFileList)
+		{ 
+			if (newEntry.path == entry.path)
+				continue;
+		}
+		// If the loop reaches the end, we didn't find a match. Delete the file.
+		m_operationList.append(UpdateOperation::DeleteOp(entry.path));
+	}
+
+	// Create a network job for downloading files.
+	NetJob* netJob = new NetJob("Update Files");
+
+	// Next, check each file in MultiMC's folder and see if we need to update them.
+	for (VersionFileEntry entry : m_nVersionFileList)
+	{
+		// TODO: Let's not MD5sum a ton of files on the GUI thread. We should probably find a way to do this in the background.
+		QString fileMD5;
+		QFile entryFile(entry.path);
+		if (entryFile.open(QFile::ReadOnly))
+		{
+			QCryptographicHash hash(QCryptographicHash::Md5);
+			hash.addData(entryFile.readAll());
+			fileMD5 = hash.result().toHex();
+		}
+
+		if (!entryFile.exists() || fileMD5.isEmpty() || fileMD5 != entry.md5)
+		{
+			QLOG_DEBUG() << "Found file" << entry.path << "that needs updating.";
+
+			// Go through the sources list and find one to use.
+			// TODO: Make a NetAction that takes a source list and tries each of them until one works. For now, we'll just use the first http one.
+			for (FileSource source : entry.sources)
+			{
+				if (source.type == "http")
+				{
+					QLOG_DEBUG() << "Will download" << entry.path << "from" << source.url;
+
+					// Download it to updatedir/<filepath>-<md5> where filepath is the file's path with slashes replaced by underscores.
+					QString dlPath = PathCombine(m_updateFilesDir.path(), QString(entry.path).replace("/", "_"));
+
+					// We need to download the file to the updatefiles folder and add a task to copy it to its install path.
+					auto download = MD5EtagDownload::make(source.url, dlPath);
+					download->m_check_md5 = true;
+					download->m_expected_md5 = entry.md5;
+					netJob->addNetAction(download);
+
+					// Now add a copy operation to our operations list to install the file.
+					m_operationList.append(UpdateOperation::CopyOp(dlPath, entry.path, entry.mode));
+				}
+			}
+		}
+	}
+
+	// Add listeners to wait for the downloads to finish.
+	QObject::connect(netJob, &NetJob::succeeded, this, &DownloadUpdateTask::fileDownloadFinished);
+	QObject::connect(netJob, &NetJob::progress, this, &DownloadUpdateTask::fileDownloadProgressChanged);
+	QObject::connect(netJob, &NetJob::failed, this, &DownloadUpdateTask::fileDownloadFailed);
+
+	// Now start the download.
+	setStatus(tr("Downloading %1 update files.").arg(QString::number(netJob->size())));
+	QLOG_DEBUG() << "Begin downloading update files to" << m_updateFilesDir.path();
+	m_filesNetJob.reset(netJob);
+	netJob->start();
+
+	writeInstallScript(m_operationList, PathCombine(m_updateFilesDir.path(), "file_list.xml"));
+}
+
+void DownloadUpdateTask::writeInstallScript(UpdateOperationList& opsList, QString scriptFile)
+{
+	// Build the base structure of the XML document.
+	QDomDocument doc;
+
+	QDomElement root = doc.createElement("update");
+	root.setAttribute("version", "3");
+	doc.appendChild(root);
+
+	QDomElement installFiles = doc.createElement("install");
+	root.appendChild(installFiles);
+
+	QDomElement removeFiles = doc.createElement("uninstall");
+	root.appendChild(removeFiles);
+
+	// Write the operation list to the XML document.
+	for (UpdateOperation op : opsList)
+	{
+		QDomElement file = doc.createElement("file");
+
+		switch (op.type)
+		{
+			case UpdateOperation::OP_COPY:
+				{
+				// Install the file.
+				QDomElement name = doc.createElement("source");
+				QDomElement path = doc.createElement("dest");
+				QDomElement mode = doc.createElement("mode");
+				name.appendChild(doc.createTextNode(op.file));
+				path.appendChild(doc.createTextNode(op.dest));
+				// We need to add a 0 at the beginning here, because Qt doesn't convert to octal correctly.
+				mode.appendChild(doc.createTextNode("0" + QString::number(op.mode, 8)));
+				file.appendChild(name);
+				file.appendChild(path);
+				file.appendChild(mode);
+				installFiles.appendChild(file);
+				QLOG_DEBUG() << "Will install file" << op.file;
+				}
+				break;
+
+			case UpdateOperation::OP_DELETE:
+				{
+				// Delete the file.
+				file.appendChild(doc.createTextNode(op.file));
+				removeFiles.appendChild(file);
+				QLOG_DEBUG() << "Will remove file" << op.file;
+				}
+				break;
+
+			default:
+				QLOG_WARN() << "Can't write update operation of type" << op.type << "to file. Not implemented.";
+				continue;
+		}
+	}
+
+	// Write the XML document to the file.
+	QFile outFile(scriptFile);
+
+	if (outFile.open(QIODevice::WriteOnly))
+	{
+		outFile.write(doc.toByteArray());
+	}
+	else
+	{
+		emitFailed(tr("Failed to write update script file."));
+	}
+}
+
+void DownloadUpdateTask::fileDownloadFinished()
+{
+	emitSucceeded();
+}
+
+void DownloadUpdateTask::fileDownloadFailed()
+{
+	// TODO: Give more info about the failure.
+	QLOG_ERROR() << "Failed to download update files.";
+	emitFailed(tr("Failed to download update files."));
+}
+
+void DownloadUpdateTask::fileDownloadProgressChanged(qint64 current, qint64 total)
+{
+	setProgress((int)(((float)current / (float)total)*100));
+}
+
+QString DownloadUpdateTask::updateFilesDir()
+{
+	return m_updateFilesDir.path();
+}
+