Renew the updater branch

Now with some actual consensus on what the updater will do!

logic/GoUpdate.cpp

@@ -0,0 +1,99 @@
+
+#include "GoUpdate.h"
+
+#include "config.h"
+#include "logger/QsLog.h"
+
+GoUpdate::GoUpdate()
+{
+	currentBuildIndex = VERSION_BUILD;
+	builderName = VERSION_BUILD_TYPE;
+	repoUrlBase = VERSION_REPO;
+}
+
+void GoUpdate::updateCheckFailed()
+{
+	// TODO: log errors better
+	QLOG_ERROR() << "Update check failed for reasons unknown.";
+}
+
+void GoUpdate::updateCheckFinished()
+{
+	QJsonParseError jsonError;
+	QByteArray data;
+	{
+		ByteArrayDownloadPtr dl =
+			std::dynamic_pointer_cast<ByteArrayDownload>(index_job->first());
+		data = dl->m_data;
+		index_job.reset();
+	}
+
+	QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
+	if (jsonError.error != QJsonParseError::NoError || !jsonDoc.isObject())
+	{
+		return;
+	}
+
+	QVariant doc = jsonDoc.toVariant();
+	auto stuff = doc.toMap();
+
+	// check api version (or later, branch?)
+	int ApiVersion = stuff["ApiVersion"].toInt();
+	if (ApiVersion != 0)
+		return;
+
+	// parse and store the channel list
+	auto parsedChannels = stuff["Channels"].toList();
+	for (auto channel : parsedChannels)
+	{
+		auto chanMap = channel.toMap();
+		channels.append({chanMap["Id"].toString(), chanMap["Name"].toString(),
+						 chanMap["CurrentVersion"].toInt()});
+	}
+
+	// parse and store the version list
+	auto parsedVersions = stuff["Versions"].toList();
+	for (auto version : parsedVersions)
+	{
+		auto verMap = version.toMap();
+		int versionId = verMap["Id"].toInt();
+		versions.append({versionId, verMap["Name"].toString()});
+		if (currentBuildIndex < versionId)
+		{
+			newBuildIndex = versionId;
+		}
+	}
+
+	if (newBuildIndex != -1)
+	{
+		QLOG_INFO() << "Update is available.";
+		emit updateAvailable();
+	}
+	else
+	{
+		QLOG_INFO() << "Update check finished.";
+	}
+}
+
+void GoUpdate::checkForUpdate()
+{
+	if (repoUrlBase == "invalid")
+	{
+		return;
+	}
+
+	auto job = new NetJob("Assets index");
+	job->addNetAction(
+		ByteArrayDownload::make(QUrl(repoUrlBase + "/" + VERSION_BRANCH + "/index.json")));
+	connect(job, SIGNAL(succeeded()), SLOT(updateCheckFinished()));
+	connect(job, SIGNAL(failed()), SLOT(updateCheckFailed()));
+	index_job.reset(job);
+	job->start();
+}
+
+/*
+<Forkk> files.multimc.org/lin64/
+<manmaed> Hi Forkkie
+<Forkk> files.multimc.org/win32/
+<Forkk> files.multimc.org/lin32/
+*/

logic/GoUpdate.h

@@ -0,0 +1,43 @@
+#pragma once
+#include "net/NetJob.h"
+
+class GoUpdate : public QObject
+{
+	Q_OBJECT
+
+public:
+	struct version_channel
+	{
+		QString id;
+		QString name;
+		int latestVersion;
+	};
+
+	struct version_summary
+	{
+		int id;
+		QString name;
+	};
+
+signals:
+	void updateAvailable();
+
+private slots:
+	void updateCheckFinished();
+	void updateCheckFailed();
+
+public:
+	GoUpdate();
+	void checkForUpdate();
+private:
+	NetJobPtr index_job;
+	NetJobPtr fromto_job;
+
+	QString repoUrlBase;
+	QString builderName;
+	int currentBuildIndex;
+	int newBuildIndex = -1;
+
+	QList<version_summary> versions;
+	QList<version_channel> channels;
+};