Working 1.6 modding (currently only forge)

21 files changed, 737 insertions, 437 deletions

diff --git a/logic/BaseInstance.cpp b/logic/BaseInstance.cpp
index 10bb4573..ec86596a 100644
--- a/logic/BaseInstance.cpp
+++ b/logic/BaseInstance.cpp
@@ -132,7 +132,7 @@ InstanceList *BaseInstance::instList() const
 		return NULL;
 }
 
-BaseVersionList *BaseInstance::versionList() const
+QSharedPointer<BaseVersionList> BaseInstance::versionList() const
 {
 	return MMC->minecraftlist();
 }
diff --git a/logic/BaseInstance.h b/logic/BaseInstance.h
index fa317ba1..374d1437 100644
--- a/logic/BaseInstance.h
+++ b/logic/BaseInstance.h
@@ -134,7 +134,7 @@ public:
 	 * \brief Gets a pointer to this instance's version list.
 	 * \return A pointer to the available version list for this instance.
 	 */
-	virtual BaseVersionList *versionList() const;
+	virtual QSharedPointer<BaseVersionList> versionList() const;
 	
 	/*!
 	 * \brief Gets this instance's settings object.
diff --git a/logic/ForgeInstaller.cpp b/logic/ForgeInstaller.cpp
new file mode 100644
index 00000000..00ad8d19
--- /dev/null
+++ b/logic/ForgeInstaller.cpp
@@ -0,0 +1,125 @@
+#include "ForgeInstaller.h"
+#include "OneSixVersion.h"
+#include "OneSixLibrary.h"
+#include <quazip.h>
+#include <quazipfile.h>
+#include <pathutils.h>
+#include <QStringList>
+
+ForgeInstaller::ForgeInstaller(QString filename, QString universal_url)
+{
+	QSharedPointer<OneSixVersion> newVersion;
+	m_universal_url = universal_url;
+
+	QuaZip zip(filename);
+	if (!zip.open(QuaZip::mdUnzip))
+		return;
+
+	QuaZipFile file(&zip);
+
+	// read the install profile
+	if (!zip.setCurrentFile("install_profile.json"))
+		return;
+
+	QJsonParseError jsonError;
+	if (!file.open(QIODevice::ReadOnly))
+		return;
+	QJsonDocument jsonDoc = QJsonDocument::fromJson(file.readAll(), &jsonError);
+	file.close();
+	if (jsonError.error != QJsonParseError::NoError)
+		return;
+
+	if (!jsonDoc.isObject())
+		return;
+
+	QJsonObject root = jsonDoc.object();
+
+	auto installVal = root.value("install");
+	auto versionInfoVal = root.value("versionInfo");
+	if (!installVal.isObject() || !versionInfoVal.isObject())
+		return;
+
+	// read the forge version info
+	{
+		newVersion = OneSixVersion::fromJson(versionInfoVal.toObject());
+		if (!newVersion)
+			return;
+	}
+
+	QJsonObject installObj = installVal.toObject();
+	QString libraryName = installObj.value("path").toString();
+	internalPath = installObj.value("filePath").toString();
+
+	// where do we put the library? decode the mojang path
+	OneSixLibrary lib(libraryName);
+	lib.finalize();
+	finalPath = "libraries/" + lib.storagePath();
+	if (!ensureFilePathExists(finalPath))
+		return;
+
+	if (!zip.setCurrentFile(internalPath))
+		return;
+	if (!file.open(QIODevice::ReadOnly))
+		return;
+	{
+		QByteArray data = file.readAll();
+		// extract file
+		QSaveFile extraction(finalPath);
+		if (!extraction.open(QIODevice::WriteOnly))
+			return;
+		if (extraction.write(data) != data.size())
+			return;
+		if (!extraction.commit())
+			return;
+	}
+	file.close();
+
+	m_forge_version = newVersion;
+	realVersionId = m_forge_version->id = installObj.value("minecraft").toString();
+}
+
+bool ForgeInstaller::apply(QSharedPointer<OneSixVersion> to)
+{
+	if (!m_forge_version)
+		return false;
+	to->externalUpdateStart();
+	int sliding_insert_window = 0;
+	{
+		// for each library in the version we are adding (except for the blacklisted)
+		QSet<QString> blacklist{"lwjgl", "lwjgl_util", "lwjgl-platform"};
+		for (auto lib : m_forge_version->libraries)
+		{
+			QString libName = lib->name();
+			// if this is the actual forge lib, set an absolute url for the download
+			if(libName.contains("minecraftforge"))
+			{
+				lib->setAbsoluteUrl(m_universal_url);
+			}
+			if (blacklist.contains(libName))
+				continue;
+
+			// find an entry that matches this one
+			bool found = false;
+			for (auto tolib : to->libraries)
+			{
+				if (tolib->name() != libName)
+					continue;
+				found = true;
+				// replace lib
+				tolib = lib;
+				break;
+			}
+			if (!found)
+			{
+				// add lib
+				to->libraries.insert(sliding_insert_window, lib);
+				sliding_insert_window++;
+			}
+		}
+		to->mainClass = m_forge_version->mainClass;
+		to->minecraftArguments = m_forge_version->minecraftArguments;
+		to->processArguments = m_forge_version->processArguments;
+	}
+	to->externalUpdateFinish();
+	return to->toOriginalFile();
+}
diff --git a/logic/ForgeInstaller.h b/logic/ForgeInstaller.h
new file mode 100644
index 00000000..f4ceaaef
--- /dev/null
+++ b/logic/ForgeInstaller.h
@@ -0,0 +1,25 @@
+#pragma once
+#include <QString>
+#include <QSharedPointer>
+
+class OneSixVersion;
+
+class ForgeInstaller
+{
+public:
+	ForgeInstaller(QString filename, QString universal_url);
+
+	bool apply(QSharedPointer<OneSixVersion> to);
+
+private:
+	// the version, read from the installer
+	QSharedPointer<OneSixVersion> m_forge_version;
+	QString internalPath;
+	QString finalPath;
+	QString realVersionId;
+	QString m_universal_url;
+};
+
+
+
+
diff --git a/logic/LegacyUpdate.cpp b/logic/LegacyUpdate.cpp
index 0f58e3e3..84d3d830 100644
--- a/logic/LegacyUpdate.cpp
+++ b/logic/LegacyUpdate.cpp
@@ -60,7 +60,7 @@ void LegacyUpdate::lwjglStart()
 	
 	m_reply = QSharedPointer<QNetworkReply> (rep, &QObject::deleteLater);
 	connect(rep, SIGNAL(downloadProgress(qint64,qint64)), SIGNAL(progress(qint64,qint64)));
-	connect(worker, SIGNAL(finished(QNetworkReply*)), SLOT(lwjglFinished(QNetworkReply*)));
+	connect(worker.data(), SIGNAL(finished(QNetworkReply*)), SLOT(lwjglFinished(QNetworkReply*)));
 	//connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), SLOT(downloadError(QNetworkReply::NetworkError)));
 }
 
@@ -77,7 +77,7 @@ void LegacyUpdate::lwjglFinished(QNetworkReply* reply)
 					"\nSometimes you have to wait a bit if you download many LWJGL versions in a row. YMMV");
 		return;
 	}
-	auto *worker = MMC->qnam();
+	auto worker = MMC->qnam();
 	//Here i check if there is a cookie for me in the reply and extract it
 	QList<QNetworkCookie> cookies = qvariant_cast<QList<QNetworkCookie>>(reply->header(QNetworkRequest::SetCookieHeader));
 	if(cookies.count() != 0)
diff --git a/logic/ModList.h b/logic/ModList.h
index 5395e9ae..e99b6c82 100644
--- a/logic/ModList.h
+++ b/logic/ModList.h
@@ -112,3 +112,6 @@ protected:
 	QString m_list_id;
 	QList<Mod> mods;
 };
+
+
+
diff --git a/logic/OneSixInstance.cpp b/logic/OneSixInstance.cpp
index 8124b4a0..9262b155 100644
--- a/logic/OneSixInstance.cpp
+++ b/logic/OneSixInstance.cpp
@@ -2,7 +2,7 @@
 #include "OneSixInstance_p.h"
 #include "OneSixUpdate.h"
 #include "MinecraftProcess.h"
-#include "VersionFactory.h"
+#include "OneSixVersion.h"
 
 #include <setting.h>
 #include <pathutils.h>
@@ -10,8 +10,9 @@
 #include <JlCompress.h>
 #include <gui/OneSixModEditDialog.h>
 
-OneSixInstance::OneSixInstance ( const QString& rootDir, SettingsObject* setting_obj, QObject* parent )
-: BaseInstance ( new OneSixInstancePrivate(), rootDir, setting_obj, parent )
+OneSixInstance::OneSixInstance(const QString &rootDir, SettingsObject *setting_obj,
+							   QObject *parent)
+	: BaseInstance(new OneSixInstancePrivate(), rootDir, setting_obj, parent)
 {
 	I_D(OneSixInstance);
 	d->m_settings->registerSetting(new Setting("IntendedVersion", ""));
@@ -19,7 +20,7 @@ OneSixInstance::OneSixInstance ( const QString& rootDir, SettingsObject* setting
 	reloadFullVersion();
 }
 
-BaseUpdate* OneSixInstance::doUpdate()
+BaseUpdate *OneSixInstance::doUpdate()
 {
 	return new OneSixUpdate(this);
 }
@@ -34,10 +35,10 @@ QString replaceTokensIn(QString text, QMap<QString, QString> with)
 	int head = 0;
 	while ((head = token_regexp.indexIn(text, head)) != -1)
 	{
-		result.append(text.mid(tail, head-tail));
+		result.append(text.mid(tail, head - tail));
 		QString key = token_regexp.cap(1);
 		auto iter = with.find(key);
-		if(iter != with.end())
+		if (iter != with.end())
 		{
 			result.append(*iter);
 		}
@@ -48,26 +49,26 @@ QString replaceTokensIn(QString text, QMap<QString, QString> with)
 	return result;
 }
 
-QStringList OneSixInstance::processMinecraftArgs( QString user, QString session )
+QStringList OneSixInstance::processMinecraftArgs(QString user, QString session)
 {
 	I_D(OneSixInstance);
 	auto version = d->version;
 	QString args_pattern = version->minecraftArguments;
-	
+
 	QMap<QString, QString> token_mapping;
 	token_mapping["auth_username"] = user;
 	token_mapping["auth_session"] = session;
-	//FIXME: user and player name are DIFFERENT!
+	// FIXME: user and player name are DIFFERENT!
 	token_mapping["auth_player_name"] = user;
-	//FIXME: WTF is this. I just plugged in a random UUID here.
+	// FIXME: WTF is this. I just plugged in a random UUID here.
 	token_mapping["auth_uuid"] = "7d4bacf0-fd62-11e2-b778-0800200c9a66"; // obviously fake.
-	
+
 	// this is for offline:
 	/*
 	map["auth_player_name"] = "Player";
 	map["auth_player_name"] = "00000000-0000-0000-0000-000000000000";
 	*/
-	
+
 	token_mapping["profile_name"] = name();
 	token_mapping["version_name"] = version->id;
 
@@ -75,8 +76,8 @@ QStringList OneSixInstance::processMinecraftArgs( QString user, QString session
 	token_mapping["game_directory"] = absRootDir;
 	QString absAssetsDir = QDir("assets/").absolutePath();
 	token_mapping["game_assets"] = absAssetsDir;
-	
-	QStringList parts = args_pattern.split(' ',QString::SkipEmptyParts);
+
+	QStringList parts = args_pattern.split(' ', QString::SkipEmptyParts);
 	for (int i = 0; i < parts.length(); i++)
 	{
 		parts[i] = replaceTokensIn(parts[i], token_mapping);
@@ -84,27 +85,28 @@ QStringList OneSixInstance::processMinecraftArgs( QString user, QString session
 	return parts;
 }
 
-MinecraftProcess* OneSixInstance::prepareForLaunch ( QString user, QString session )
+MinecraftProcess *OneSixInstance::prepareForLaunch(QString user, QString session)
 {
 	I_D(OneSixInstance);
 	cleanupAfterRun();
 	auto version = d->version;
-	if(!version)
+	if (!version)
 		return nullptr;
 	auto libs_to_extract = version->getActiveNativeLibs();
 	QString natives_dir_raw = PathCombine(instanceRoot(), "natives/");
 	bool success = ensureFolderPathExists(natives_dir_raw);
-	if(!success)
+	if (!success)
 	{
 		// FIXME: handle errors
 		return nullptr;
 	}
-	
-	for(auto lib: libs_to_extract)
+
+	for (auto lib : libs_to_extract)
 	{
 		QString path = "libraries/" + lib->storagePath();
 		qDebug() << "Will extract " << path.toLocal8Bit();
-		if(JlCompress::extractWithExceptions(path, natives_dir_raw, lib->extract_excludes).isEmpty())
+		if (JlCompress::extractWithExceptions(path, natives_dir_raw, lib->extract_excludes)
+				.isEmpty())
 		{
 			return nullptr;
 		}
@@ -116,11 +118,11 @@ MinecraftProcess* OneSixInstance::prepareForLaunch ( QString user, QString sessi
 	args << QString("-Xmx%1m").arg(settings().get("MaxMemAlloc").toInt());
 	args << QString("-XX:PermSize=%1m").arg(settings().get("PermGen").toInt());
 	QDir natives_dir(natives_dir_raw);
-	args << QString("-Djava.library.path=%1").arg( natives_dir.absolutePath() );
+	args << QString("-Djava.library.path=%1").arg(natives_dir.absolutePath());
 	QString classPath;
 	{
 		auto libs = version->getActiveNormalLibs();
-		for (auto lib: libs)
+		for (auto lib : libs)
 		{
 			QFileInfo fi(QString("libraries/") + lib->storagePath());
 			classPath.append(fi.absoluteFilePath());
@@ -134,16 +136,16 @@ MinecraftProcess* OneSixInstance::prepareForLaunch ( QString user, QString sessi
 		QFileInfo fi(targetstr);
 		classPath.append(fi.absoluteFilePath());
 	}
-	if(classPath.size())
+	if (classPath.size())
 	{
 		args << "-cp";
 		args << classPath;
 	}
 	args << version->mainClass;
 	args.append(processMinecraftArgs(user, session));
-	
+
 	// create the process and set its parameters
-	MinecraftProcess * proc = new MinecraftProcess(this);
+	MinecraftProcess *proc = new MinecraftProcess(this);
 	proc->setMinecraftArguments(args);
 	proc->setMinecraftWorkdir(minecraftRoot());
 	return proc;
@@ -156,10 +158,10 @@ void OneSixInstance::cleanupAfterRun()
 	dir.removeRecursively();
 }
 
-QSharedPointer< ModList > OneSixInstance::loaderModList()
+QSharedPointer<ModList> OneSixInstance::loaderModList()
 {
 	I_D(OneSixInstance);
-	if(!d->loader_mod_list)
+	if (!d->loader_mod_list)
 	{
 		d->loader_mod_list.reset(new ModList(loaderModsDir()));
 	}
@@ -168,10 +170,10 @@ QSharedPointer< ModList > OneSixInstance::loaderModList()
 	return d->loader_mod_list;
 }
 
-QSharedPointer< ModList > OneSixInstance::resourcePackList()
+QSharedPointer<ModList> OneSixInstance::resourcePackList()
 {
 	I_D(OneSixInstance);
-	if(!d->resource_pack_list)
+	if (!d->resource_pack_list)
 	{
 		d->resource_pack_list.reset(new ModList(resourcePacksDir()));
 	}
@@ -180,13 +182,12 @@ QSharedPointer< ModList > OneSixInstance::resourcePackList()
 	return d->resource_pack_list;
 }
 
-
-QDialog * OneSixInstance::createModEditDialog ( QWidget* parent )
+QDialog *OneSixInstance::createModEditDialog(QWidget *parent)
 {
 	return new OneSixModEditDialog(this, parent);
 }
 
-bool OneSixInstance::setIntendedVersionId ( QString version )
+bool OneSixInstance::setIntendedVersionId(QString version)
 {
 	settings().set("IntendedVersion", version);
 	setShouldUpdate(true);
@@ -198,16 +199,16 @@ QString OneSixInstance::intendedVersionId() const
 	return settings().get("IntendedVersion").toString();
 }
 
-void OneSixInstance::setShouldUpdate ( bool val )
+void OneSixInstance::setShouldUpdate(bool val)
 {
-	settings().set ( "ShouldUpdate", val );
+	settings().set("ShouldUpdate", val);
 }
 
 bool OneSixInstance::shouldUpdate() const
 {
 	I_D(OneSixInstance);
-	QVariant var = settings().get ( "ShouldUpdate" );
-	if ( !var.isValid() || var.toBool() == false )
+	QVariant var = settings().get("ShouldUpdate");
+	if (!var.isValid() || var.toBool() == false)
 	{
 		return intendedVersionId() != currentVersionId();
 	}
@@ -228,56 +229,51 @@ QString OneSixInstance::currentVersionId() const
 
 bool OneSixInstance::customizeVersion()
 {
-	if(!versionIsCustom())
+	if (!versionIsCustom())
 	{
 		auto pathCustom = PathCombine(instanceRoot(), "custom.json");
 		auto pathOrig = PathCombine(instanceRoot(), "version.json");
 		QFile::copy(pathOrig, pathCustom);
 		return reloadFullVersion();
 	}
-	else return true;
+	else
+		return true;
 }
 
 bool OneSixInstance::revertCustomVersion()
 {
-	if(versionIsCustom())
+	if (versionIsCustom())
 	{
 		auto path = PathCombine(instanceRoot(), "custom.json");
 		QFile::remove(path);
 		return reloadFullVersion();
 	}
-	else return true;
+	else
+		return true;
 }
 
-
 bool OneSixInstance::reloadFullVersion()
 {
 	I_D(OneSixInstance);
-	
+
 	QString verpath = PathCombine(instanceRoot(), "version.json");
 	{
 		QString verpath_custom = PathCombine(instanceRoot(), "custom.json");
 		QFile versionfile(verpath_custom);
-		if(versionfile.exists())
+		if (versionfile.exists())
 			verpath = verpath_custom;
 	}
-	
-	QFile versionfile(verpath);
-	if(versionfile.exists() && versionfile.open(QIODevice::ReadOnly))
+
+	auto version = OneSixVersion::fromFile(verpath);
+	if (version)
 	{
-		FullVersionFactory fvf;
-		auto version = fvf.parse(versionfile.readAll());
-		versionfile.close();
-		if(version)
-		{
-			d->version = version;
-			return true;
-		}
-	};
+		d->version = version;
+		return true;
+	}
 	return false;
 }
 
-QSharedPointer< OneSixVersion > OneSixInstance::getFullVersion()
+QSharedPointer<OneSixVersion> OneSixInstance::getFullVersion()
 {
 	I_D(OneSixInstance);
 	return d->version;
@@ -293,9 +289,9 @@ QString OneSixInstance::defaultCustomBaseJar() const
 	return PathCombine(instanceRoot(), "custom.jar");
 }
 
-bool OneSixInstance::menuActionEnabled ( QString action_name ) const
+bool OneSixInstance::menuActionEnabled(QString action_name) const
 {
-	if(action_name == "actionChangeInstLWJGLVersion")
+	if (action_name == "actionChangeInstLWJGLVersion")
 		return false;
 	return true;
 }
@@ -303,7 +299,7 @@ bool OneSixInstance::menuActionEnabled ( QString action_name ) const
 QString OneSixInstance::getStatusbarDescription()
 {
 	QString descr = "One Six : " + intendedVersionId();
-	if(versionIsCustom())
+	if (versionIsCustom())
 	{
 		descr + " (custom)";
 	}
diff --git a/logic/OneSixLibrary.cpp b/logic/OneSixLibrary.cpp
index a45a4aec..8da1fde7 100644
--- a/logic/OneSixLibrary.cpp
+++ b/logic/OneSixLibrary.cpp
@@ -1,18 +1,19 @@
 #include "OneSixLibrary.h"
 #include "OneSixRule.h"
 #include "OpSys.h"
+#include <QJsonArray>
 void OneSixLibrary::finalize()
 {
-	QStringList parts = m_name.split ( ':' );
+	QStringList parts = m_name.split(':');
 	QString relative = parts[0];
-	relative.replace ( '.','/' );
+	relative.replace('.', '/');
 	relative += '/' + parts[1] + '/' + parts[2] + '/' + parts[1] + '-' + parts[2];
-	
-	if ( !m_is_native )
+
+	if (!m_is_native)
 		relative += ".jar";
 	else
 	{
-		if ( m_native_suffixes.contains ( currentSystem ) )
+		if (m_native_suffixes.contains(currentSystem))
 		{
 			relative += "-" + m_native_suffixes[currentSystem] + ".jar";
 		}
@@ -22,30 +23,30 @@ void OneSixLibrary::finalize()
 			relative += ".jar";
 		}
 	}
-	
+
 	m_decentname = parts[1];
 	m_decentversion = parts[2];
 	m_storage_path = relative;
-	m_download_path = m_base_url + relative;
-	
-	if ( m_rules.empty() )
+	m_download_url = m_base_url + relative;
+
+	if (m_rules.empty())
 	{
 		m_is_active = true;
 	}
 	else
 	{
 		RuleAction result = Disallow;
-		for ( auto rule: m_rules )
+		for (auto rule : m_rules)
 		{
-			RuleAction temp = rule->apply ( this );
-			if ( temp != Defer )
+			RuleAction temp = rule->apply(this);
+			if (temp != Defer)
 				result = temp;
 		}
-		m_is_active = ( result == Allow );
+		m_is_active = (result == Allow);
 	}
-	if ( m_is_native )
+	if (m_is_native)
 	{
-		m_is_active = m_is_active && m_native_suffixes.contains ( currentSystem );
+		m_is_active = m_is_active && m_native_suffixes.contains(currentSystem);
 		m_decenttype = "Native";
 	}
 	else
@@ -54,11 +55,11 @@ void OneSixLibrary::finalize()
 	}
 }
 
-void OneSixLibrary::setName ( QString name )
+void OneSixLibrary::setName(QString name)
 {
 	m_name = name;
 }
-void OneSixLibrary::setBaseUrl ( QString base_url )
+void OneSixLibrary::setBaseUrl(QString base_url)
 {
 	m_base_url = base_url;
 }
@@ -66,12 +67,12 @@ void OneSixLibrary::setIsNative()
 {
 	m_is_native = true;
 }
-void OneSixLibrary::addNative ( OpSys os, QString suffix )
+void OneSixLibrary::addNative(OpSys os, QString suffix)
 {
 	m_is_native = true;
 	m_native_suffixes[os] = suffix;
 }
-void OneSixLibrary::setRules ( QList< QSharedPointer< Rule > > rules )
+void OneSixLibrary::setRules(QList<QSharedPointer<Rule>> rules)
 {
 	m_rules = rules;
 }
@@ -83,11 +84,66 @@ bool OneSixLibrary::isNative()
 {
 	return m_is_native;
 }
-QString OneSixLibrary::downloadPath()
+QString OneSixLibrary::downloadUrl()
 {
-	return m_download_path;
+	if(m_absolute_url.size())
+		return m_absolute_url;
+	return m_download_url;
 }
 QString OneSixLibrary::storagePath()
 {
 	return m_storage_path;
 }
+
+void OneSixLibrary::setAbsoluteUrl(QString absolute_url)
+{
+	m_absolute_url = absolute_url;
+}
+
+QString OneSixLibrary::absoluteUrl()
+{
+	return m_absolute_url;
+}
+
+QJsonObject OneSixLibrary::toJson()
+{
+	QJsonObject libRoot;
+	libRoot.insert("name", m_name);
+	if(m_absolute_url.size())
+		libRoot.insert("MMC-absulute_url", m_absolute_url);
+	if(m_base_url != "https://s3.amazonaws.com/Minecraft.Download/libraries/")
+		libRoot.insert("url", m_base_url);
+	if (isNative() && m_native_suffixes.size())
+	{
+		QJsonObject nativeList;
+		auto iter = m_native_suffixes.begin();
+		while (iter != m_native_suffixes.end())
+		{
+			nativeList.insert(OpSys_toString(iter.key()), iter.value());
+			iter++;
+		}
+		libRoot.insert("natives", nativeList);
+	}
+	if (isNative() && extract_excludes.size())
+	{
+		QJsonArray excludes;
+		QJsonObject extract;
+		for (auto exclude : extract_excludes)
+		{
+			excludes.append(exclude);
+		}
+		extract.insert("exclude", excludes);
+		libRoot.insert("extract", extract);
+	}
+	if (m_rules.size())
+	{
+		QJsonArray allRules;
+		for (auto &rule : m_rules)
+		{
+			QJsonObject ruleObj = rule->toJson();
+			allRules.append(ruleObj);
+		}
+		libRoot.insert("rules", allRules);
+	}
+	return libRoot;
+}
diff --git a/logic/OneSixLibrary.h b/logic/OneSixLibrary.h
index ac16d3d3..f3106483 100644
--- a/logic/OneSixLibrary.h
+++ b/logic/OneSixLibrary.h
@@ -3,6 +3,7 @@
 #include <QStringList>
 #include <QMap>
 #include <QSharedPointer>
+#include <QJsonObject>
 #include "OpSys.h"
 
 class Rule;
@@ -12,9 +13,13 @@ class OneSixLibrary
 private:
 	// basic values used internally (so far)
 	QString m_name;
-	QString m_base_url;
+	QString m_base_url = "https://s3.amazonaws.com/Minecraft.Download/libraries/";
 	QList<QSharedPointer<Rule> > m_rules;
-	
+
+	// custom values
+	/// absolute URL. takes precedence over m_download_path, if defined
+	QString m_absolute_url;
+
 	// derived values used for real things
 	/// a decent name fit for display
 	QString m_decentname;
@@ -25,11 +30,11 @@ private:
 	/// where to store the lib locally
 	QString m_storage_path;
 	/// where to download the lib from
-	QString m_download_path;
+	QString m_download_url;
 	/// is this lib actually active on the current OS?
-	bool m_is_active;
+	bool m_is_active = false;
 	/// is the library a native?
-	bool m_is_native;
+	bool m_is_native = false;
 	/// native suffixes per OS
 	QMap<OpSys, QString> m_native_suffixes;
 public:
@@ -39,12 +44,11 @@ public:
 	/// Constructor
 	OneSixLibrary(QString name)
 	{
-		m_is_native = false;
-		m_is_active = false;
 		m_name = name;
-		m_base_url = "https://s3.amazonaws.com/Minecraft.Download/libraries/";
 	}
 	
+	QJsonObject toJson();
+	
 	/**
 	 * finalize the library, processing the input values into derived values and state
 	 * 
@@ -84,7 +88,11 @@ public:
 	/// Returns true if the library is native
 	bool isNative();
 	/// Get the URL to download the library from
-	QString downloadPath();
+	QString downloadUrl();
 	/// Get the relative path where the library should be saved
 	QString storagePath();
+	
+	/// set an absolute URL for the library. This is an MMC extension.
+	void setAbsoluteUrl(QString absolute_url);
+	QString absoluteUrl();
 };
diff --git a/logic/OneSixRule.cpp b/logic/OneSixRule.cpp
index 85f7d434..545cd641 100644
--- a/logic/OneSixRule.cpp
+++ b/logic/OneSixRule.cpp
@@ -1,10 +1,72 @@
 #include "OneSixRule.h"
+#include <QJsonObject>
+#include <QJsonArray>
+
+QList<QSharedPointer<Rule>> rulesFromJsonV4(QJsonObject &objectWithRules)
+{
+	QList<QSharedPointer<Rule>> rules;
+	auto rulesVal = objectWithRules.value("rules");
+	if (!rulesVal.isArray())
+		return rules;
+
+	QJsonArray ruleList = rulesVal.toArray();
+	for (auto ruleVal : ruleList)
+	{
+		QSharedPointer<Rule> rule;
+		if (!ruleVal.isObject())
+			continue;
+		auto ruleObj = ruleVal.toObject();
+		auto actionVal = ruleObj.value("action");
+		if (!actionVal.isString())
+			continue;
+		auto action = RuleAction_fromString(actionVal.toString());
+		if (action == Defer)
+			continue;
+
+		auto osVal = ruleObj.value("os");
+		if (!osVal.isObject())
+		{
+			// add a new implicit action rule
+			rules.append(ImplicitRule::create(action));
+			continue;
+		}
+
+		auto osObj = osVal.toObject();
+		auto osNameVal = osObj.value("name");
+		if (!osNameVal.isString())
+			continue;
+		OpSys requiredOs = OpSys_fromString(osNameVal.toString());
+		QString versionRegex = osObj.value("version").toString();
+		// add a new OS rule
+		rules.append(OsRule::create(action, requiredOs, versionRegex));
+	}
+}
+
+QJsonObject ImplicitRule::toJson()
+{
+	QJsonObject ruleObj;
+	ruleObj.insert("action", m_result == Allow ? QString("allow") : QString("disallow"));
+	return ruleObj;
+}
+
+QJsonObject OsRule::toJson()
+{
+	QJsonObject ruleObj;
+	ruleObj.insert("action", m_result == Allow ? QString("allow") : QString("disallow"));
+	QJsonObject osObj;
+	{
+		osObj.insert("name", OpSys_toString(m_system));
+		osObj.insert("version", m_version_regexp);
+	}
+	ruleObj.insert("os", osObj);
+	return ruleObj;
+}
 
 RuleAction RuleAction_fromString(QString name)
 {
-	if(name == "allow")
+	if (name == "allow")
 		return Allow;
-	if(name == "disallow")
+	if (name == "disallow")
 		return Disallow;
 	return Defer;
 }
\ No newline at end of file
diff --git a/logic/OneSixRule.h b/logic/OneSixRule.h
index 465c963f..23d20ff4 100644
--- a/logic/OneSixRule.h
+++ b/logic/OneSixRule.h
@@ -1,8 +1,6 @@
 #pragma once
 #include <QString>
 #include <QSharedPointer>
-
-class OneSixLibrary;
 #include "OneSixLibrary.h"
 
 enum RuleAction
@@ -13,6 +11,7 @@ enum RuleAction
 };
 
 RuleAction RuleAction_fromString(QString);
+QList<QSharedPointer<Rule>> rulesFromJsonV4(QJsonObject &objectWithRules);
 
 class Rule
 {
@@ -23,6 +22,7 @@ public:
 	Rule(RuleAction result)
 		:m_result(result) {}
 	virtual ~Rule(){};
+	virtual QJsonObject toJson() = 0;
 	RuleAction apply(OneSixLibrary * parent)
 	{
 		if(applies(parent))
@@ -47,6 +47,7 @@ protected:
 	OsRule(RuleAction result, OpSys system, QString version_regexp)
 		: Rule(result), m_system(system), m_version_regexp(version_regexp) {}
 public:
+	virtual QJsonObject toJson();
 	static QSharedPointer<OsRule> create(RuleAction result, OpSys system, QString version_regexp)
 	{
 		return QSharedPointer<OsRule> (new OsRule(result, system, version_regexp));
@@ -63,6 +64,7 @@ protected:
 	ImplicitRule(RuleAction result)
 		: Rule(result) {}
 public:
+	virtual QJsonObject toJson();
 	static QSharedPointer<ImplicitRule> create(RuleAction result)
 	{
 		return QSharedPointer<ImplicitRule> (new ImplicitRule(result));
diff --git a/logic/OneSixUpdate.cpp b/logic/OneSixUpdate.cpp
index 298ad28a..d0af8b93 100644
--- a/logic/OneSixUpdate.cpp
+++ b/logic/OneSixUpdate.cpp
@@ -3,7 +3,7 @@
  * 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
@@ -26,20 +26,20 @@
 
 #include "BaseInstance.h"
 #include "lists/MinecraftVersionList.h"
-#include "VersionFactory.h"
 #include "OneSixVersion.h"
 #include "OneSixLibrary.h"
 #include "OneSixInstance.h"
 
 #include "pathutils.h"
 
-
-OneSixUpdate::OneSixUpdate(BaseInstance *inst, QObject *parent):BaseUpdate(inst, parent){}
+OneSixUpdate::OneSixUpdate(BaseInstance *inst, QObject *parent) : BaseUpdate(inst, parent)
+{
+}
 
 void OneSixUpdate::executeTask()
 {
 	QString intendedVersion = m_inst->intendedVersionId();
-	
+
 	// Make directories
 	QDir mcDir(m_inst->minecraftRoot());
 	if (!mcDir.exists() && !mcDir.mkpath("."))
@@ -47,17 +47,18 @@ void OneSixUpdate::executeTask()
 		emitFailed("Failed to create bin folder.");
 		return;
 	}
-	
+
 	// Get a pointer to the version object that corresponds to the instance's version.
-	targetVersion = MMC->minecraftlist()->findVersion(intendedVersion).dynamicCast<MinecraftVersion>();
-	if(targetVersion == nullptr)
+	targetVersion =
+		MMC->minecraftlist()->findVersion(intendedVersion).dynamicCast<MinecraftVersion>();
+	if (targetVersion == nullptr)
 	{
 		// don't do anything if it was invalid
 		emitSucceeded();
 		return;
 	}
-	
-	if(m_inst->shouldUpdate())
+
+	if (m_inst->shouldUpdate())
 	{
 		versionFileStart();
 	}
@@ -70,62 +71,65 @@ void OneSixUpdate::executeTask()
 void OneSixUpdate::versionFileStart()
 {
 	setStatus("Getting the version files from Mojang.");
-	
+
 	QString urlstr("http://s3.amazonaws.com/Minecraft.Download/versions/");
 	urlstr += targetVersion->descriptor() + "/" + targetVersion->descriptor() + ".json";
 	auto job = new DownloadJob("Version index");
 	job->add(QUrl(urlstr));
 	specificVersionDownloadJob.reset(job);
-	connect(specificVersionDownloadJob.data(), SIGNAL(succeeded()), SLOT(versionFileFinished()));
+	connect(specificVersionDownloadJob.data(), SIGNAL(succeeded()),
+			SLOT(versionFileFinished()));
 	connect(specificVersionDownloadJob.data(), SIGNAL(failed()), SLOT(versionFileFailed()));
-	connect(specificVersionDownloadJob.data(), SIGNAL(progress(qint64,qint64)), SIGNAL(progress(qint64,qint64)));
+	connect(specificVersionDownloadJob.data(), SIGNAL(progress(qint64, qint64)),
+			SIGNAL(progress(qint64, qint64)));
 	specificVersionDownloadJob->start();
 }
 
 void OneSixUpdate::versionFileFinished()
 {
 	DownloadPtr DlJob = specificVersionDownloadJob->first();
-	OneSixInstance * inst = (OneSixInstance *) m_inst;
-	
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+
 	QString version_id = targetVersion->descriptor();
 	QString inst_dir = m_inst->instanceRoot();
 	// save the version file in $instanceId/version.json
 	{
-		QString version1 =  PathCombine(inst_dir, "/version.json");
+		QString version1 = PathCombine(inst_dir, "/version.json");
 		ensureFilePathExists(version1);
 		// FIXME: detect errors here, download to a temp file, swap
-		QSaveFile vfile1 (version1);
-		if(!vfile1.open(QIODevice::Truncate | QIODevice::WriteOnly ))
+		QSaveFile vfile1(version1);
+		if (!vfile1.open(QIODevice::Truncate | QIODevice::WriteOnly))
 		{
 			emitFailed("Can't open " + version1 + " for writing.");
 			return;
 		}
 		auto data = DlJob.dynamicCast<ByteArrayDownload>()->m_data;
 		qint64 actual = 0;
-		if((actual = vfile1.write(data)) != data.size())
+		if ((actual = vfile1.write(data)) != data.size())
 		{
-			emitFailed("Failed to write into " + version1 + ". Written " + actual + " out of " + data.size() + '.');
+			emitFailed("Failed to write into " + version1 + ". Written " + actual + " out of " +
+					   data.size() + '.');
 			return;
 		}
-		if(!vfile1.commit())
+		if (!vfile1.commit())
 		{
 			emitFailed("Can't commit changes to " + version1);
 			return;
 		}
 	}
-	
+
 	// the version is downloaded safely. update is 'done' at this point
 	m_inst->setShouldUpdate(false);
-	
+
 	// delete any custom version inside the instance (it's no longer relevant, we did an update)
-	QString custom =  PathCombine(inst_dir, "/custom.json");
+	QString custom = PathCombine(inst_dir, "/custom.json");
 	QFile finfo(custom);
-	if(finfo.exists())
+	if (finfo.exists())
 	{
 		finfo.remove();
 	}
 	inst->reloadFullVersion();
-	
+
 	jarlibStart();
 }
 
@@ -136,42 +140,44 @@ void OneSixUpdate::versionFileFailed()
 
 void OneSixUpdate::jarlibStart()
 {
-	OneSixInstance * inst = (OneSixInstance *) m_inst;
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
 	bool successful = inst->reloadFullVersion();
-	if(!successful)
+	if (!successful)
 	{
-		emitFailed("Failed to load the version description file (version.json). It might be corrupted, missing or simply too new.");
+		emitFailed("Failed to load the version description file (version.json). It might be "
+				   "corrupted, missing or simply too new.");
 		return;
 	}
-	
+
 	QSharedPointer<OneSixVersion> version = inst->getFullVersion();
-	
+
 	// download the right jar, save it in versions/$version/$version.jar
 	QString urlstr("http://s3.amazonaws.com/Minecraft.Download/versions/");
 	urlstr += version->id + "/" + version->id + ".jar";
-	QString targetstr ("versions/");
+	QString targetstr("versions/");
 	targetstr += version->id + "/" + version->id + ".jar";
-	
+
 	auto job = new DownloadJob("Libraries for instance " + inst->name());
 	job->add(QUrl(urlstr), targetstr);
 	jarlibDownloadJob.reset(job);
-	
+
 	auto libs = version->getActiveNativeLibs();
 	libs.append(version->getActiveNormalLibs());
-	
+
 	auto metacache = MMC->metacache();
-	for(auto lib: libs)
+	for (auto lib : libs)
 	{
-		QString download_path = lib->downloadPath();
+		QString download_path = lib->downloadUrl();
 		auto entry = metacache->resolveEntry("libraries", lib->storagePath());
-		if(entry->stale)
+		if (entry->stale)
 		{
 			jarlibDownloadJob->add(download_path, entry);
 		}
 	}
 	connect(jarlibDownloadJob.data(), SIGNAL(succeeded()), SLOT(jarlibFinished()));
 	connect(jarlibDownloadJob.data(), SIGNAL(failed()), SLOT(jarlibFailed()));
-	connect(jarlibDownloadJob.data(), SIGNAL(progress(qint64,qint64)), SIGNAL(progress(qint64,qint64)));
+	connect(jarlibDownloadJob.data(), SIGNAL(progress(qint64, qint64)),
+			SIGNAL(progress(qint64, qint64)));
 
 	jarlibDownloadJob->start();
 }
@@ -185,4 +191,3 @@ void OneSixUpdate::jarlibFailed()
 {
 	emitFailed("Failed to download the binary garbage. Try again. Maybe. IF YOU DARE");
 }
-
diff --git a/logic/OneSixVersion.cpp b/logic/OneSixVersion.cpp
index dc1b5d6f..663d903a 100644
--- a/logic/OneSixVersion.cpp
+++ b/logic/OneSixVersion.cpp
@@ -1,10 +1,201 @@
 #include "OneSixVersion.h"
 #include "OneSixLibrary.h"
+#include "OneSixRule.h"
 
-QList<QSharedPointer<OneSixLibrary> > OneSixVersion::getActiveNormalLibs()
+QSharedPointer<OneSixVersion> fromJsonV4(QJsonObject root,
+										 QSharedPointer<OneSixVersion> fullVersion)
 {
-	QList<QSharedPointer<OneSixLibrary> > output;
-	for ( auto lib: libraries )
+	fullVersion->id = root.value("id").toString();
+
+	fullVersion->mainClass = root.value("mainClass").toString();
+	auto procArgsValue = root.value("processArguments");
+	if (procArgsValue.isString())
+	{
+		fullVersion->processArguments = procArgsValue.toString();
+		QString toCompare = fullVersion->processArguments.toLower();
+		if (toCompare == "legacy")
+		{
+			fullVersion->minecraftArguments = " ${auth_player_name} ${auth_session}";
+		}
+		else if (toCompare == "username_session")
+		{
+			fullVersion->minecraftArguments =
+				"--username ${auth_player_name} --session ${auth_session}";
+		}
+		else if (toCompare == "username_session_version")
+		{
+			fullVersion->minecraftArguments = "--username ${auth_player_name} "
+											  "--session ${auth_session} "
+											  "--version ${profile_name}";
+		}
+	}
+
+	auto minecraftArgsValue = root.value("minecraftArguments");
+	if (minecraftArgsValue.isString())
+	{
+		fullVersion->minecraftArguments = minecraftArgsValue.toString();
+	}
+
+	auto minecraftTypeValue = root.value("type");
+	if (minecraftTypeValue.isString())
+	{
+		fullVersion->type = minecraftTypeValue.toString();
+	}
+
+	fullVersion->releaseTime = root.value("releaseTime").toString();
+	fullVersion->time = root.value("time").toString();
+
+	// Iterate through the list, if it's a list.
+	auto librariesValue = root.value("libraries");
+	if (!librariesValue.isArray())
+		return fullVersion;
+
+	QJsonArray libList = root.value("libraries").toArray();
+	for (auto libVal : libList)
+	{
+		if (!libVal.isObject())
+		{
+			continue;
+		}
+
+		QJsonObject libObj = libVal.toObject();
+
+		// Library name
+		auto nameVal = libObj.value("name");
+		if (!nameVal.isString())
+			continue;
+		QSharedPointer<OneSixLibrary> library(new OneSixLibrary(nameVal.toString()));
+
+		auto urlVal = libObj.value("url");
+		if (urlVal.isString())
+		{
+			library->setBaseUrl(urlVal.toString());
+		}
+		auto urlAbsVal = libObj.value("MMC-absulute_url");
+		if (urlAbsVal.isString())
+		{
+			library->setAbsoluteUrl(urlAbsVal.toString());
+		}
+		// Extract excludes (if any)
+		auto extractVal = libObj.value("extract");
+		if (extractVal.isObject())
+		{
+			QStringList excludes;
+			auto extractObj = extractVal.toObject();
+			auto excludesVal = extractObj.value("exclude");
+			if (excludesVal.isArray())
+			{
+				auto excludesList = excludesVal.toArray();
+				for (auto excludeVal : excludesList)
+				{
+					if (excludeVal.isString())
+						excludes.append(excludeVal.toString());
+				}
+				library->extract_excludes = excludes;
+			}
+		}
+
+		auto nativesVal = libObj.value("natives");
+		if (nativesVal.isObject())
+		{
+			library->setIsNative();
+			auto nativesObj = nativesVal.toObject();
+			auto iter = nativesObj.begin();
+			while (iter != nativesObj.end())
+			{
+				auto osType = OpSys_fromString(iter.key());
+				if (osType == Os_Other)
+					continue;
+				if (!iter.value().isString())
+					continue;
+				library->addNative(osType, iter.value().toString());
+				iter++;
+			}
+		}
+		library->setRules(rulesFromJsonV4(libObj));
+		library->finalize();
+		fullVersion->libraries.append(library);
+	}
+	return fullVersion;
+}
+
+QSharedPointer<OneSixVersion> OneSixVersion::fromJson(QJsonObject root)
+{
+	QSharedPointer<OneSixVersion> readVersion(new OneSixVersion());
+	int launcher_ver = readVersion->minimumLauncherVersion =
+		root.value("minimumLauncherVersion").toDouble();
+
+	// ADD MORE HERE :D
+	if (launcher_ver > 0 && launcher_ver <= 7)
+		return fromJsonV4(root, readVersion);
+	else
+	{
+		return QSharedPointer<OneSixVersion>();
+	}
+}
+
+QSharedPointer<OneSixVersion> OneSixVersion::fromFile(QString filepath)
+{
+	QFile file(filepath);
+	if (!file.open(QIODevice::ReadOnly))
+	{
+		return QSharedPointer<OneSixVersion>();
+	}
+
+	auto data = file.readAll();
+	QJsonParseError jsonError;
+	QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
+
+	if (jsonError.error != QJsonParseError::NoError)
+	{
+		return QSharedPointer<OneSixVersion>();
+	}
+
+	if (!jsonDoc.isObject())
+	{
+		return QSharedPointer<OneSixVersion>();
+	}
+	QJsonObject root = jsonDoc.object();
+	auto version = fromJson(root);
+	version->original_file = filepath;
+	return version;
+}
+
+bool OneSixVersion::toOriginalFile()
+{
+	if (original_file.isEmpty())
+		return false;
+	QSaveFile file(original_file);
+	if (!file.open(QIODevice::WriteOnly))
+	{
+		return false;
+	}
+	// serialize base attributes (those we care about anyway)
+	QJsonObject root;
+	root.insert("minecraftArguments", minecraftArguments);
+	root.insert("mainClass", mainClass);
+	root.insert("minimumLauncherVersion", minimumLauncherVersion);
+	root.insert("time", time);
+	root.insert("id", id);
+	root.insert("type", type);
+	// screw processArguments
+	root.insert("releaseTime", releaseTime);
+	QJsonArray libarray;
+	for(const auto & lib: libraries)
+	{
+		libarray.append(lib->toJson());
+	}
+	if(libarray.count())
+		root.insert("libraries", libarray);
+	QJsonDocument doc(root);
+	file.write(doc.toJson());
+	return file.commit();
+}
+
+QList<QSharedPointer<OneSixLibrary>> OneSixVersion::getActiveNormalLibs()
+{
+	QList<QSharedPointer<OneSixLibrary>> output;
+	for (auto lib : libraries)
 	{
 		if (lib->isActive() && !lib->isNative())
 		{
@@ -14,10 +205,10 @@ QList<QSharedPointer<OneSixLibrary> > OneSixVersion::getActiveNormalLibs()
 	return output;
 }
 
-QList<QSharedPointer<OneSixLibrary> > OneSixVersion::getActiveNativeLibs()
+QList<QSharedPointer<OneSixLibrary>> OneSixVersion::getActiveNativeLibs()
 {
-	QList<QSharedPointer<OneSixLibrary> > output;
-	for ( auto lib: libraries )
+	QList<QSharedPointer<OneSixLibrary>> output;
+	for (auto lib : libraries)
 	{
 		if (lib->isActive() && lib->isNative())
 		{
@@ -27,41 +218,50 @@ QList<QSharedPointer<OneSixLibrary> > OneSixVersion::getActiveNativeLibs()
 	return output;
 }
 
+void OneSixVersion::externalUpdateStart()
+{
+	beginResetModel();
+}
+
+void OneSixVersion::externalUpdateFinish()
+{
+	endResetModel();
+}
 
-QVariant OneSixVersion::data(const QModelIndex& index, int role) const
+QVariant OneSixVersion::data(const QModelIndex &index, int role) const
 {
-	if(!index.isValid())
+	if (!index.isValid())
 		return QVariant();
-	
+
 	int row = index.row();
 	int column = index.column();
-	
-	if(row < 0 || row >= libraries.size())
+
+	if (row < 0 || row >= libraries.size())
 		return QVariant();
-	
-	if(role == Qt::DisplayRole)
+
+	if (role == Qt::DisplayRole)
 	{
-		switch(column)
+		switch (column)
 		{
-			case 0:
-				return libraries[row]->name();
-			case 1:
-				return libraries[row]->type();
-			case 2:
-				return libraries[row]->version();
-			default:
-				return QVariant();
+		case 0:
+			return libraries[row]->name();
+		case 1:
+			return libraries[row]->type();
+		case 2:
+			return libraries[row]->version();
+		default:
+			return QVariant();
 		}
 	}
 	return QVariant();
 }
 
-Qt::ItemFlags OneSixVersion::flags(const QModelIndex& index) const
+Qt::ItemFlags OneSixVersion::flags(const QModelIndex &index) const
 {
-	if(!index.isValid())
+	if (!index.isValid())
 		return Qt::NoItemFlags;
 	int row = index.row();
-	if(libraries[row]->isActive())
+	if (libraries[row]->isActive())
 	{
 		return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemNeverHasChildren;
 	}
@@ -69,11 +269,10 @@ Qt::ItemFlags OneSixVersion::flags(const QModelIndex& index) const
 	{
 		return Qt::ItemNeverHasChildren;
 	}
-	//return QAbstractListModel::flags(index);
+	// return QAbstractListModel::flags(index);
 }
 
-
-QVariant OneSixVersion::headerData ( int section, Qt::Orientation orientation, int role ) const
+QVariant OneSixVersion::headerData(int section, Qt::Orientation orientation, int role) const
 {
 	if (role != Qt::DisplayRole || orientation != Qt::Horizontal)
 		return QVariant();
@@ -90,12 +289,12 @@ QVariant OneSixVersion::headerData ( int section, Qt::Orientation orientation, i
 	}
 }
 
-int OneSixVersion::rowCount(const QModelIndex& parent) const
+int OneSixVersion::rowCount(const QModelIndex &parent) const
 {
 	return libraries.size();
 }
 
-int OneSixVersion::columnCount(const QModelIndex& parent) const
+int OneSixVersion::columnCount(const QModelIndex &parent) const
 {
-    return 3;
+	return 3;
 }
diff --git a/logic/OneSixVersion.h b/logic/OneSixVersion.h
index 6a6a5b4b..69268ecf 100644
--- a/logic/OneSixVersion.h
+++ b/logic/OneSixVersion.h
@@ -4,13 +4,33 @@ class OneSixLibrary;
 
 class OneSixVersion : public QAbstractListModel
 {
+	// Things required to implement the Qt list model
 public:
-	virtual QVariant data ( const QModelIndex& index, int role = Qt::DisplayRole ) const;
-	virtual int rowCount ( const QModelIndex& parent = QModelIndex() ) const;
-	virtual QVariant headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;
-	virtual int columnCount ( const QModelIndex& parent ) const;
-    virtual Qt::ItemFlags flags(const QModelIndex& index) const;
+	virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+	virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
+	virtual QVariant headerData(int section, Qt::Orientation orientation,
+								int role = Qt::DisplayRole) const;
+	virtual int columnCount(const QModelIndex &parent) const;
+	virtual Qt::ItemFlags flags(const QModelIndex &index) const;
+
+	// serialization/deserialization
+public:
+	bool toOriginalFile();
+	static QSharedPointer<OneSixVersion> fromJson(QJsonObject root);
+	static QSharedPointer<OneSixVersion> fromFile(QString filepath);
+
 public:
+	QList<QSharedPointer<OneSixLibrary>> getActiveNormalLibs();
+	QList<QSharedPointer<OneSixLibrary>> getActiveNativeLibs();
+	// called when something starts/stops messing with the object
+	// FIXME: these are ugly in every possible way.
+	void externalUpdateStart();
+	void externalUpdateFinish();
+
+	// data members
+public:
+	/// file this was read from. blank, if none
+	QString original_file;
 	/// the ID - determines which jar to use! ACTUALLY IMPORTANT!
 	QString id;
 	/// Last updated time - as a string
@@ -23,26 +43,27 @@ public:
 	 * DEPRECATED: Old versions of the new vanilla launcher used this
 	 * ex: "username_session_version"
 	 */
-	QString processArguments; 
+	QString processArguments;
 	/**
 	 * arguments that should be used for launching minecraft
-	 * 
+	 *
 	 * ex: "--username ${auth_player_name} --session ${auth_session}
 	 *      --version ${version_name} --gameDir ${game_directory} --assetsDir ${game_assets}"
 	 */
 	QString minecraftArguments;
 	/**
-	 * the minimum launcher version required by this version ... current is 4 (at point of writing)
+	 * the minimum launcher version required by this version ... current is 4 (at point of
+	 * writing)
 	 */
-	int minimumLauncherVersion;
+	int minimumLauncherVersion = 0xDEADBEEF;
 	/**
 	 * The main class to load first
 	 */
 	QString mainClass;
-	
+
 	/// the list of libs - both active and inactive, native and java
-	QList<QSharedPointer<OneSixLibrary> > libraries;
-	
+	QList<QSharedPointer<OneSixLibrary>> libraries;
+
 	/*
 	FIXME: add support for those rules here? Looks like a pile of quick hacks to me though.
 
@@ -58,18 +79,11 @@ public:
 		}
 		}
 	],
-	"incompatibilityReason": "There is a bug in LWJGL which makes it incompatible with OSX 10.5.8. Please go to New Profile and use 1.5.2 for now. Sorry!"
+	"incompatibilityReason": "There is a bug in LWJGL which makes it incompatible with OSX
+	10.5.8. Please go to New Profile and use 1.5.2 for now. Sorry!"
 	}
 	*/
 	// QList<Rule> rules;
-	
-public:
-	
-	OneSixVersion()
-	{
-		minimumLauncherVersion = 0xDEADBEEF;
-	}
-	
-	QList<QSharedPointer<OneSixLibrary> > getActiveNormalLibs();
-	QList<QSharedPointer<OneSixLibrary> > getActiveNativeLibs();
+
+
 };
diff --git a/logic/OpSys.cpp b/logic/OpSys.cpp
index 559479fd..f101fd08 100644
--- a/logic/OpSys.cpp
+++ b/logic/OpSys.cpp
@@ -9,4 +9,15 @@ OpSys OpSys_fromString(QString name)
 	if(name == "osx")
 		return Os_OSX;
 	return Os_Other;
+}
+
+QString OpSys_toString(OpSys name)
+{
+	switch(name)
+	{
+		case Os_Linux: return "linux";
+		case Os_OSX: return "osx";
+		case Os_Windows: return "windows";
+		default: return "other";
+	}
 }
\ No newline at end of file
diff --git a/logic/OpSys.h b/logic/OpSys.h
index c68c437a..aaa2eb65 100644
--- a/logic/OpSys.h
+++ b/logic/OpSys.h
@@ -9,6 +9,7 @@ enum OpSys
 };
 
 OpSys OpSys_fromString(QString);
+QString OpSys_toString(OpSys);
 
 #ifdef Q_OS_WIN32
 	#define currentSystem Os_Windows
diff --git a/logic/VersionFactory.cpp b/logic/VersionFactory.cpp
deleted file mode 100644
index 4fa5ad3f..00000000
--- a/logic/VersionFactory.cpp
+++ /dev/null
@@ -1,196 +0,0 @@
-#include "VersionFactory.h"
-#include "OneSixVersion.h"
-#include "OneSixRule.h"
-
-// Library rules (if any)
-QList<QSharedPointer<Rule> > FullVersionFactory::parse4rules(QJsonObject & baseObj)
-{
-	QList<QSharedPointer<Rule> > rules;
-	auto rulesVal = baseObj.value("rules");
-	if(rulesVal.isArray())
-	{
-		QJsonArray ruleList = rulesVal.toArray();
-		for(auto ruleVal : ruleList)
-		{
-			QSharedPointer<Rule> rule;
-			if(!ruleVal.isObject())
-				continue;
-			auto ruleObj = ruleVal.toObject();
-			auto actionVal = ruleObj.value("action");
-			if(!actionVal.isString())
-				continue;
-			auto action = RuleAction_fromString(actionVal.toString());
-			if(action == Defer)
-				continue;
-			
-			auto osVal = ruleObj.value("os");
-			if(!osVal.isObject())
-			{
-				// add a new implicit action rule
-				rules.append(ImplicitRule::create(action));
-			}
-			else
-			{
-				auto osObj = osVal.toObject();
-				auto osNameVal = osObj.value("name");
-				if(!osNameVal.isString())
-					continue;
-				OpSys requiredOs = OpSys_fromString(osNameVal.toString());
-				QString versionRegex = osObj.value("version").toString();
-				// add a new OS rule
-				rules.append(OsRule::create(action, requiredOs, versionRegex));
-			}
-		}
-	}
-	return rules;
-}
-
-
-QSharedPointer<OneSixVersion> FullVersionFactory::parse4(QJsonObject root, QSharedPointer<OneSixVersion> fullVersion)
-{
-	fullVersion->id = root.value("id").toString();
-	
-	fullVersion->mainClass = root.value("mainClass").toString();
-	auto procArgsValue = root.value("processArguments");
-	if(procArgsValue.isString())
-	{
-		fullVersion->processArguments = procArgsValue.toString();
-		QString toCompare = fullVersion->processArguments.toLower();
-		if(toCompare == "legacy")
-		{
-			fullVersion->minecraftArguments = " ${auth_player_name} ${auth_session}";
-		}
-		else if(toCompare == "username_session")
-		{
-			fullVersion->minecraftArguments = "--username ${auth_player_name} --session ${auth_session}";
-		}
-		else if(toCompare == "username_session_version")
-		{
-			fullVersion->minecraftArguments = "--username ${auth_player_name} --session ${auth_session} --version ${profile_name}";
-		}
-	}
-	
-	auto minecraftArgsValue = root.value("minecraftArguments");
-	if(minecraftArgsValue.isString())
-	{
-		fullVersion->minecraftArguments = minecraftArgsValue.toString();
-	}
-	
-	auto minecraftTypeValue = root.value("type");
-	if(minecraftTypeValue.isString())
-	{
-		fullVersion->type = minecraftTypeValue.toString();
-	}
-	
-	fullVersion->releaseTime = root.value("releaseTime").toString();
-	fullVersion->time = root.value("time").toString();
-	
-	// Iterate through the list, if it's a list.
-	auto librariesValue = root.value("libraries");
-	if(!librariesValue.isArray())
-		return fullVersion;
-	
-	QJsonArray libList = root.value("libraries").toArray();
-	for (auto libVal : libList)
-	{
-		if (!libVal.isObject())
-		{
-			continue;
-		}
-		
-		QJsonObject libObj = libVal.toObject();
-		
-		// Library name
-		auto nameVal = libObj.value("name");
-		if(!nameVal.isString())
-			continue;
-		QSharedPointer<OneSixLibrary> library(new OneSixLibrary(nameVal.toString()));
-		
-		auto urlVal = libObj.value("url");
-		if(urlVal.isString())
-		{
-			library->setBaseUrl(urlVal.toString());
-		}
-		
-		// Extract excludes (if any)
-		auto extractVal = libObj.value("extract");
-		if(extractVal.isObject())
-		{
-			QStringList excludes;
-			auto extractObj = extractVal.toObject();
-			auto excludesVal = extractObj.value("exclude");
-			if(!excludesVal.isArray())
-				goto SKIP_EXTRACTS;
-			auto excludesList = excludesVal.toArray();
-			for(auto excludeVal : excludesList)
-			{
-				if(excludeVal.isString())
-					excludes.append(excludeVal.toString());
-			}
-			library->extract_excludes = excludes;
-		}
-		SKIP_EXTRACTS:
-		
-		auto nativesVal = libObj.value("natives");
-		if(nativesVal.isObject())
-		{
-			library->setIsNative();
-			auto nativesObj = nativesVal.toObject();
-			auto iter = nativesObj.begin();
-			while(iter != nativesObj.end())
-			{
-				auto osType = OpSys_fromString(iter.key());
-				if(osType == Os_Other)
-					continue;
-				if(!iter.value().isString())
-					continue;
-				library->addNative(osType, iter.value().toString());
-				iter++;
-			}
-		}
-		library->setRules(parse4rules(libObj));
-		library->finalize();
-		fullVersion->libraries.append(library);
-	}
-	return fullVersion;
-}
-
-QSharedPointer<OneSixVersion> FullVersionFactory::parse(QByteArray data)
-{
-	QSharedPointer<OneSixVersion> readVersion(new OneSixVersion());
-	
-	QJsonParseError jsonError;
-	QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
-	
-	if (jsonError.error != QJsonParseError::NoError)
-	{
-		error_string = QString( "Error reading version file :") + " " + jsonError.errorString();
-		m_error = FullVersionFactory::ParseError;
-		return QSharedPointer<OneSixVersion>();
-	}
-	
-	if(!jsonDoc.isObject())
-	{
-		error_string = "Error reading version file.";
-		m_error = FullVersionFactory::ParseError;
-		return QSharedPointer<OneSixVersion>();
-	}
-	QJsonObject root = jsonDoc.object();
-	
-	int launcher_ver = readVersion->minimumLauncherVersion = root.value("minimumLauncherVersion").toDouble();
-	// ADD MORE HERE :D
-	if(launcher_ver > 0 && launcher_ver <= 7)
-		return parse4(root, readVersion);
-	else
-	{
-		error_string = "Version file was for an unrecognized launcher version. RIP";
-		m_error = FullVersionFactory::UnsupportedVersion;
-		return QSharedPointer<OneSixVersion>();
-	}
-}
-
-
-FullVersionFactory::FullVersionFactory()
-{
-	m_error = FullVersionFactory::AllOK;
-}
diff --git a/logic/VersionFactory.h b/logic/VersionFactory.h
deleted file mode 100644
index 0c0ee2d4..00000000
--- a/logic/VersionFactory.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#pragma once
-#include <QtCore>
-
-struct OneSixVersion;
-class Rule;
-
-class FullVersionFactory
-{
-public:
-	enum Error
-	{
-		AllOK, // all parsed OK
-		ParseError, // the file was corrupted somehow
-		UnsupportedVersion // the file was meant for a launcher version we don't support (yet)
-	} m_error;
-	QString error_string;
-
-public:
-	FullVersionFactory();
-	QSharedPointer<OneSixVersion> parse(QByteArray data);
-private:
-	QSharedPointer<OneSixVersion> parse4(QJsonObject root, QSharedPointer<OneSixVersion> product);
-	QList<QSharedPointer<Rule> > parse4rules(QJsonObject & baseObj);
-};
\ No newline at end of file
diff --git a/logic/lists/ForgeVersionList.cpp b/logic/lists/ForgeVersionList.cpp
index 492849ee..9205e70f 100644
--- a/logic/lists/ForgeVersionList.cpp
+++ b/logic/lists/ForgeVersionList.cpp
@@ -260,8 +260,10 @@ void ForgeListLoadTask::list_downloaded()
 			fVersion->installer_url = installer_url;
 			fVersion->jobbuildver = jobbuildver;
 			fVersion->mcver = mcver;
-			fVersion->filename = filename;
-			fVersion->filename = installer_filename;
+			if(installer_filename.isEmpty())
+				fVersion->filename = filename;
+			else
+				fVersion->filename = installer_filename;
 			fVersion->m_buildnr = build_nr;
 			tempList.append(fVersion);
 		}
@@ -271,3 +273,8 @@ void ForgeListLoadTask::list_downloaded()
 	emitSucceeded();
 	return;
 }
+
+
+
+
+
diff --git a/logic/lists/ForgeVersionList.h b/logic/lists/ForgeVersionList.h
index ca6b27bc..613de8a6 100644
--- a/logic/lists/ForgeVersionList.h
+++ b/logic/lists/ForgeVersionList.h
@@ -3,7 +3,7 @@
  * 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
@@ -33,19 +33,22 @@ struct ForgeVersion : public BaseVersion
 	virtual QString descriptor()
 	{
 		return filename;
-	};
+	}
+	;
 	virtual QString name()
 	{
 		return "Forge " + jobbuildver;
-	};
+	}
+	;
 	virtual QString typeString() const
 	{
-		if(installer_url.isEmpty())
+		if (installer_url.isEmpty())
 			return "Universal";
 		else
 			return "Installer";
-	};
-	
+	}
+	;
+
 	int m_buildnr = 0;
 	QString universal_url;
 	QString changelog_url;
@@ -60,42 +63,45 @@ class ForgeVersionList : public BaseVersionList
 	Q_OBJECT
 public:
 	friend class ForgeListLoadTask;
-	
+
 	explicit ForgeVersionList(QObject *parent = 0);
-	
+
 	virtual Task *getLoadTask();
 	virtual bool isLoaded();
 	virtual const BaseVersionPtr at(int i) const;
 	virtual int count() const;
 	virtual void sort();
-	
+
 	virtual BaseVersionPtr getLatestStable() const;
-	
-    virtual QVariant data(const QModelIndex& index, int role) const;
-    virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const;
-    virtual int columnCount(const QModelIndex& parent) const;
-	
+
+	virtual QVariant data(const QModelIndex &index, int role) const;
+	virtual QVariant headerData(int section, Qt::Orientation orientation,
+								int role) const;
+	virtual int columnCount(const QModelIndex &parent) const;
+
 protected:
 	QList<BaseVersionPtr> m_vlist;
-	
+
 	bool m_loaded;
-	
-protected slots:
-	virtual void updateListData(QList<BaseVersionPtr > versions);
+
+protected
+slots:
+	virtual void updateListData(QList<BaseVersionPtr> versions);
 };
 
 class ForgeListLoadTask : public Task
 {
 	Q_OBJECT
-	
+
 public:
 	explicit ForgeListLoadTask(ForgeVersionList *vlist);
-	
+
 	virtual void executeTask();
-	
-protected slots:
+
+protected
+slots:
 	void list_downloaded();
-	
+
 protected:
 	DownloadJobPtr listJob;
 	ForgeVersionList *m_list;
diff --git a/logic/tasks/LoginTask.cpp b/logic/tasks/LoginTask.cpp
index 859827bc..222af618 100644
--- a/logic/tasks/LoginTask.cpp
+++ b/logic/tasks/LoginTask.cpp
@@ -30,7 +30,7 @@ void LoginTask::executeTask()
 {
 	setStatus(tr("Logging in..."));
 	auto worker = MMC->qnam();
-	connect(worker, SIGNAL(finished(QNetworkReply*)), this, SLOT(processNetReply(QNetworkReply*)));
+	connect(worker.data(), SIGNAL(finished(QNetworkReply*)), this, SLOT(processNetReply(QNetworkReply*)));
 	
 	QUrl loginURL("https://login.minecraft.net/");
 	QNetworkRequest netRequest(loginURL);