8 files changed, 1814 insertions, 0 deletions

diff --git a/api/logic/minecraft/onesix/OneSixInstance.cpp b/api/logic/minecraft/onesix/OneSixInstance.cpp
new file mode 100644
index 00000000..258e26c5
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixInstance.cpp
@@ -0,0 +1,597 @@
+/* Copyright 2013-2015 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 <QDebug>
+#include <Env.h>
+
+#include "OneSixInstance.h"
+#include "OneSixUpdate.h"
+#include "OneSixProfileStrategy.h"
+
+#include "minecraft/MinecraftProfile.h"
+#include "minecraft/VersionBuildError.h"
+#include "launch/LaunchTask.h"
+#include "launch/steps/PreLaunchCommand.h"
+#include "launch/steps/Update.h"
+#include "launch/steps/LaunchMinecraft.h"
+#include "launch/steps/PostLaunchCommand.h"
+#include "launch/steps/TextPrint.h"
+#include "launch/steps/ModMinecraftJar.h"
+#include "launch/steps/CheckJava.h"
+#include "MMCZip.h"
+
+#include "minecraft/AssetsUtils.h"
+#include "minecraft/WorldList.h"
+#include <FileSystem.h>
+
+OneSixInstance::OneSixInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir)
+	: MinecraftInstance(globalSettings, settings, rootDir)
+{
+	m_settings->registerSetting({"IntendedVersion", "MinecraftVersion"}, "");
+}
+
+void OneSixInstance::init()
+{
+	createProfile();
+}
+
+void OneSixInstance::createProfile()
+{
+	m_profile.reset(new MinecraftProfile(new OneSixProfileStrategy(this)));
+}
+
+QSet<QString> OneSixInstance::traits()
+{
+	auto version = getMinecraftProfile();
+	if (!version)
+	{
+		return {"version-incomplete"};
+	}
+	else
+	{
+		return version->getTraits();
+	}
+}
+
+std::shared_ptr<Task> OneSixInstance::createUpdateTask()
+{
+	return std::shared_ptr<Task>(new OneSixUpdate(this));
+}
+
+QString replaceTokensIn(QString text, QMap<QString, QString> with)
+{
+	QString result;
+	QRegExp token_regexp("\\$\\{(.+)\\}");
+	token_regexp.setMinimal(true);
+	QStringList list;
+	int tail = 0;
+	int head = 0;
+	while ((head = token_regexp.indexIn(text, head)) != -1)
+	{
+		result.append(text.mid(tail, head - tail));
+		QString key = token_regexp.cap(1);
+		auto iter = with.find(key);
+		if (iter != with.end())
+		{
+			result.append(*iter);
+		}
+		head += token_regexp.matchedLength();
+		tail = head;
+	}
+	result.append(text.mid(tail));
+	return result;
+}
+
+QStringList OneSixInstance::processMinecraftArgs(AuthSessionPtr session)
+{
+	QString args_pattern = m_profile->getMinecraftArguments();
+	for (auto tweaker : m_profile->getTweakers())
+	{
+		args_pattern += " --tweakClass " + tweaker;
+	}
+
+	QMap<QString, QString> token_mapping;
+	// yggdrasil!
+	token_mapping["auth_username"] = session->username;
+	token_mapping["auth_session"] = session->session;
+	token_mapping["auth_access_token"] = session->access_token;
+	token_mapping["auth_player_name"] = session->player_name;
+	token_mapping["auth_uuid"] = session->uuid;
+
+	// blatant self-promotion.
+	token_mapping["profile_name"] = token_mapping["version_name"] = "MultiMC5";
+	if(m_profile->isVanilla())
+	{
+		token_mapping["version_type"] = m_profile->getMinecraftVersionType();
+	}
+	else
+	{
+		token_mapping["version_type"] = "custom";
+	}
+
+	QString absRootDir = QDir(minecraftRoot()).absolutePath();
+	token_mapping["game_directory"] = absRootDir;
+	QString absAssetsDir = QDir("assets/").absolutePath();
+	auto assets = m_profile->getMinecraftAssets();
+	token_mapping["game_assets"] = AssetsUtils::reconstructAssets(assets->id).absolutePath();
+
+	token_mapping["user_properties"] = session->serializeUserProperties();
+	token_mapping["user_type"] = session->user_type;
+
+	// 1.7.3+ assets tokens
+	token_mapping["assets_root"] = absAssetsDir;
+	token_mapping["assets_index_name"] = assets->id;
+
+	QStringList parts = args_pattern.split(' ', QString::SkipEmptyParts);
+	for (int i = 0; i < parts.length(); i++)
+	{
+		parts[i] = replaceTokensIn(parts[i], token_mapping);
+	}
+	return parts;
+}
+
+QString OneSixInstance::createLaunchScript(AuthSessionPtr session)
+{
+	QString launchScript;
+
+	if (!m_profile)
+		return nullptr;
+
+	for(auto & mod: loaderModList()->allMods())
+	{
+		if(!mod.enabled())
+			continue;
+		if(mod.type() == Mod::MOD_FOLDER)
+			continue;
+		// TODO: proper implementation would need to descend into folders.
+
+		launchScript += "mod " + mod.filename().completeBaseName()  + "\n";;
+	}
+
+	for(auto & coremod: coreModList()->allMods())
+	{
+		if(!coremod.enabled())
+			continue;
+		if(coremod.type() == Mod::MOD_FOLDER)
+			continue;
+		// TODO: proper implementation would need to descend into folders.
+
+		launchScript += "coremod " + coremod.filename().completeBaseName()  + "\n";;
+	}
+
+	for(auto & jarmod: m_profile->getJarMods())
+	{
+		launchScript += "jarmod " + jarmod->originalName + " (" + jarmod->name + ")\n";
+	}
+
+	auto mainClass = m_profile->getMainClass();
+	if (!mainClass.isEmpty())
+	{
+		launchScript += "mainClass " + mainClass + "\n";
+	}
+	auto appletClass = m_profile->getAppletClass();
+	if (!appletClass.isEmpty())
+	{
+		launchScript += "appletClass " + appletClass + "\n";
+	}
+
+	// generic minecraft params
+	for (auto param : processMinecraftArgs(session))
+	{
+		launchScript += "param " + param + "\n";
+	}
+
+	// window size, title and state, legacy
+	{
+		QString windowParams;
+		if (settings()->get("LaunchMaximized").toBool())
+			windowParams = "max";
+		else
+			windowParams = QString("%1x%2")
+							   .arg(settings()->get("MinecraftWinWidth").toInt())
+							   .arg(settings()->get("MinecraftWinHeight").toInt());
+		launchScript += "windowTitle " + windowTitle() + "\n";
+		launchScript += "windowParams " + windowParams + "\n";
+	}
+
+	// legacy auth
+	{
+		launchScript += "userName " + session->player_name + "\n";
+		launchScript += "sessionId " + session->session + "\n";
+	}
+
+	// libraries and class path.
+	{
+		auto libs = m_profile->getLibraries();
+
+		QStringList jar, native, native32, native64;
+		for (auto lib : libs)
+		{
+			lib->getApplicableFiles(currentSystem, jar, native, native32, native64);
+		}
+		for(auto file: jar)
+		{
+			launchScript += "cp " + file + "\n";
+		}
+		for(auto file: native)
+		{
+			launchScript += "ext " + file + "\n";
+		}
+		for(auto file: native32)
+		{
+			launchScript += "ext32 " + file + "\n";
+		}
+		for(auto file: native64)
+		{
+			launchScript += "ext64 " + file + "\n";
+		}
+		QDir natives_dir(FS::PathCombine(instanceRoot(), "natives/"));
+		launchScript += "natives " + natives_dir.absolutePath() + "\n";
+		auto jarMods = getJarMods();
+		if (!jarMods.isEmpty())
+		{
+			launchScript += "cp " + QDir(instanceRoot()).absoluteFilePath("minecraft.jar") + "\n";
+		}
+		else
+		{
+			QString relpath = m_profile->getMinecraftVersion() + "/" + m_profile->getMinecraftVersion() + ".jar";
+			launchScript += "cp " + versionsPath().absoluteFilePath(relpath) + "\n";
+		}
+	}
+
+	// traits. including legacyLaunch and others ;)
+	for (auto trait : m_profile->getTraits())
+	{
+		launchScript += "traits " + trait + "\n";
+	}
+	launchScript += "launcher onesix\n";
+	return launchScript;
+}
+
+std::shared_ptr<LaunchTask> OneSixInstance::createLaunchTask(AuthSessionPtr session)
+{
+	auto process = LaunchTask::create(std::dynamic_pointer_cast<MinecraftInstance>(getSharedPtr()));
+	auto pptr = process.get();
+
+	// print a header
+	{
+		process->appendStep(std::make_shared<TextPrint>(pptr, "Minecraft folder is:\n" + minecraftRoot() + "\n\n", MessageLevel::MultiMC));
+	}
+	{
+		auto step = std::make_shared<CheckJava>(pptr);
+		process->appendStep(step);
+	}
+	// run pre-launch command if that's needed
+	if(getPreLaunchCommand().size())
+	{
+		auto step = std::make_shared<PreLaunchCommand>(pptr);
+		step->setWorkingDirectory(minecraftRoot());
+		process->appendStep(step);
+	}
+	// if we aren't in offline mode,.
+	if(session->status != AuthSession::PlayableOffline)
+	{
+		process->appendStep(std::make_shared<Update>(pptr));
+	}
+	// if there are any jar mods
+	if(getJarMods().size())
+	{
+		auto step = std::make_shared<ModMinecraftJar>(pptr);
+		process->appendStep(step);
+	}
+	// actually launch the game
+	{
+		auto step = std::make_shared<LaunchMinecraft>(pptr);
+		step->setWorkingDirectory(minecraftRoot());
+		step->setAuthSession(session);
+		process->appendStep(step);
+	}
+	// run post-exit command if that's needed
+	if(getPostExitCommand().size())
+	{
+		auto step = std::make_shared<PostLaunchCommand>(pptr);
+		step->setWorkingDirectory(minecraftRoot());
+		process->appendStep(step);
+	}
+	if (session)
+	{
+		process->setCensorFilter(createCensorFilterFromSession(session));
+	}
+	return process;
+}
+
+std::shared_ptr<Task> OneSixInstance::createJarModdingTask()
+{
+	class JarModTask : public Task
+	{
+	public:
+		explicit JarModTask(std::shared_ptr<OneSixInstance> inst) : Task(nullptr), m_inst(inst)
+		{
+		}
+		virtual void executeTask()
+		{
+			auto profile = m_inst->getMinecraftProfile();
+			// nuke obsolete stripped jar(s) if needed
+			QString version_id = profile->getMinecraftVersion();
+			QString strippedPath = version_id + "/" + version_id + "-stripped.jar";
+			QFile strippedJar(strippedPath);
+			if(strippedJar.exists())
+			{
+				strippedJar.remove();
+			}
+			auto tempJarPath = QDir(m_inst->instanceRoot()).absoluteFilePath("temp.jar");
+			QFile tempJar(tempJarPath);
+			if(tempJar.exists())
+			{
+				tempJar.remove();
+			}
+			auto finalJarPath = QDir(m_inst->instanceRoot()).absoluteFilePath("minecraft.jar");
+			QFile finalJar(finalJarPath);
+			if(finalJar.exists())
+			{
+				if(!finalJar.remove())
+				{
+					emitFailed(tr("Couldn't remove stale jar file: %1").arg(finalJarPath));
+					return;
+				}
+			}
+
+			// create temporary modded jar, if needed
+			auto jarMods = m_inst->getJarMods();
+			if(jarMods.size())
+			{
+				auto sourceJarPath = m_inst->versionsPath().absoluteFilePath(version_id + "/" + version_id + ".jar");
+				QString localPath = version_id + "/" + version_id + ".jar";
+				auto metacache = ENV.metacache();
+				auto entry = metacache->resolveEntry("versions", localPath);
+				QString fullJarPath = entry->getFullPath();
+				if(!MMCZip::createModdedJar(sourceJarPath, finalJarPath, jarMods))
+				{
+					emitFailed(tr("Failed to create the custom Minecraft jar file."));
+					return;
+				}
+			}
+			emitSucceeded();
+		}
+		std::shared_ptr<OneSixInstance> m_inst;
+	};
+	return std::make_shared<JarModTask>(std::dynamic_pointer_cast<OneSixInstance>(shared_from_this()));
+}
+
+void OneSixInstance::cleanupAfterRun()
+{
+	QString target_dir = FS::PathCombine(instanceRoot(), "natives/");
+	QDir dir(target_dir);
+	dir.removeRecursively();
+}
+
+std::shared_ptr<ModList> OneSixInstance::loaderModList() const
+{
+	if (!m_loader_mod_list)
+	{
+		m_loader_mod_list.reset(new ModList(loaderModsDir()));
+	}
+	m_loader_mod_list->update();
+	return m_loader_mod_list;
+}
+
+std::shared_ptr<ModList> OneSixInstance::coreModList() const
+{
+	if (!m_core_mod_list)
+	{
+		m_core_mod_list.reset(new ModList(coreModsDir()));
+	}
+	m_core_mod_list->update();
+	return m_core_mod_list;
+}
+
+std::shared_ptr<ModList> OneSixInstance::resourcePackList() const
+{
+	if (!m_resource_pack_list)
+	{
+		m_resource_pack_list.reset(new ModList(resourcePacksDir()));
+	}
+	m_resource_pack_list->update();
+	return m_resource_pack_list;
+}
+
+std::shared_ptr<ModList> OneSixInstance::texturePackList() const
+{
+	if (!m_texture_pack_list)
+	{
+		m_texture_pack_list.reset(new ModList(texturePacksDir()));
+	}
+	m_texture_pack_list->update();
+	return m_texture_pack_list;
+}
+
+std::shared_ptr<WorldList> OneSixInstance::worldList() const
+{
+	if (!m_world_list)
+	{
+		m_world_list.reset(new WorldList(worldDir()));
+	}
+	return m_world_list;
+}
+
+bool OneSixInstance::setIntendedVersionId(QString version)
+{
+	settings()->set("IntendedVersion", version);
+	if(getMinecraftProfile())
+	{
+		clearProfile();
+	}
+	emit propertiesChanged(this);
+	return true;
+}
+
+QList< Mod > OneSixInstance::getJarMods() const
+{
+	QList<Mod> mods;
+	for (auto jarmod : m_profile->getJarMods())
+	{
+		QString filePath = jarmodsPath().absoluteFilePath(jarmod->name);
+		mods.push_back(Mod(QFileInfo(filePath)));
+	}
+	return mods;
+}
+
+
+QString OneSixInstance::intendedVersionId() const
+{
+	return settings()->get("IntendedVersion").toString();
+}
+
+void OneSixInstance::setShouldUpdate(bool)
+{
+}
+
+bool OneSixInstance::shouldUpdate() const
+{
+	return true;
+}
+
+QString OneSixInstance::currentVersionId() const
+{
+	return intendedVersionId();
+}
+
+void OneSixInstance::reloadProfile()
+{
+	m_profile->reload();
+	auto severity = m_profile->getProblemSeverity();
+	if(severity == ProblemSeverity::PROBLEM_ERROR)
+	{
+		setFlag(VersionBrokenFlag);
+	}
+	else
+	{
+		unsetFlag(VersionBrokenFlag);
+	}
+	emit versionReloaded();
+}
+
+void OneSixInstance::clearProfile()
+{
+	m_profile->clear();
+	emit versionReloaded();
+}
+
+std::shared_ptr<MinecraftProfile> OneSixInstance::getMinecraftProfile() const
+{
+	return m_profile;
+}
+
+QDir OneSixInstance::librariesPath() const
+{
+	return QDir::current().absoluteFilePath("libraries");
+}
+
+QDir OneSixInstance::jarmodsPath() const
+{
+	return QDir(jarModsDir());
+}
+
+QDir OneSixInstance::versionsPath() const
+{
+	return QDir::current().absoluteFilePath("versions");
+}
+
+bool OneSixInstance::providesVersionFile() const
+{
+	return false;
+}
+
+bool OneSixInstance::reload()
+{
+	if (BaseInstance::reload())
+	{
+		try
+		{
+			reloadProfile();
+			return true;
+		}
+		catch (...)
+		{
+			return false;
+		}
+	}
+	return false;
+}
+
+QString OneSixInstance::loaderModsDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "mods");
+}
+
+QString OneSixInstance::coreModsDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "coremods");
+}
+
+QString OneSixInstance::resourcePacksDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "resourcepacks");
+}
+
+QString OneSixInstance::texturePacksDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "texturepacks");
+}
+
+QString OneSixInstance::instanceConfigFolder() const
+{
+	return FS::PathCombine(minecraftRoot(), "config");
+}
+
+QString OneSixInstance::jarModsDir() const
+{
+	return FS::PathCombine(instanceRoot(), "jarmods");
+}
+
+QString OneSixInstance::libDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "lib");
+}
+
+QString OneSixInstance::worldDir() const
+{
+	return FS::PathCombine(minecraftRoot(), "saves");
+}
+
+QStringList OneSixInstance::extraArguments() const
+{
+	auto list = BaseInstance::extraArguments();
+	auto version = getMinecraftProfile();
+	if (!version)
+		return list;
+	auto jarMods = getJarMods();
+	if (!jarMods.isEmpty())
+	{
+		list.append({"-Dfml.ignoreInvalidMinecraftCertificates=true",
+					 "-Dfml.ignorePatchDiscrepancies=true"});
+	}
+	return list;
+}
+
+std::shared_ptr<OneSixInstance> OneSixInstance::getSharedPtr()
+{
+	return std::dynamic_pointer_cast<OneSixInstance>(BaseInstance::getSharedPtr());
+}
+
+QString OneSixInstance::typeName() const
+{
+	return tr("OneSix");
+}
diff --git a/api/logic/minecraft/onesix/OneSixInstance.h b/api/logic/minecraft/onesix/OneSixInstance.h
new file mode 100644
index 00000000..2dfab48c
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixInstance.h
@@ -0,0 +1,117 @@
+/* Copyright 2013-2015 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.
+ */
+
+#pragma once
+
+#include "minecraft/MinecraftInstance.h"
+
+#include "minecraft/MinecraftProfile.h"
+#include "minecraft/ModList.h"
+
+#include "multimc_logic_export.h"
+
+class MULTIMC_LOGIC_EXPORT OneSixInstance : public MinecraftInstance
+{
+	Q_OBJECT
+public:
+	explicit OneSixInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir);
+	virtual ~OneSixInstance(){};
+
+	virtual void init() override;
+
+	//////  Mod Lists  //////
+	std::shared_ptr<ModList> loaderModList() const;
+	std::shared_ptr<ModList> coreModList() const;
+	std::shared_ptr<ModList> resourcePackList() const override;
+	std::shared_ptr<ModList> texturePackList() const override;
+	std::shared_ptr<WorldList> worldList() const override;
+	virtual QList<Mod> getJarMods() const override;
+	virtual void createProfile();
+
+	virtual QSet<QString> traits() override;
+
+	////// Directories and files //////
+	QString jarModsDir() const;
+	QString resourcePacksDir() const;
+	QString texturePacksDir() const;
+	QString loaderModsDir() const;
+	QString coreModsDir() const;
+	QString libDir() const;
+	QString worldDir() const;
+	virtual QString instanceConfigFolder() const override;
+
+	virtual std::shared_ptr<Task> createUpdateTask() override;
+	virtual std::shared_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account) override;
+	virtual std::shared_ptr<Task> createJarModdingTask() override;
+
+	virtual QString createLaunchScript(AuthSessionPtr session) override;
+
+	virtual void cleanupAfterRun() override;
+
+	virtual QString intendedVersionId() const override;
+	virtual bool setIntendedVersionId(QString version) override;
+
+	virtual QString currentVersionId() const override;
+
+	virtual bool shouldUpdate() const override;
+	virtual void setShouldUpdate(bool val) override;
+
+	/**
+	 * reload the profile, including version json files.
+	 *
+	 * throws various exceptions :3
+	 */
+	void reloadProfile();
+
+	/// clears all version information in preparation for an update
+	void clearProfile();
+
+	/// get the current full version info
+	std::shared_ptr<MinecraftProfile> getMinecraftProfile() const;
+
+	virtual QDir jarmodsPath() const;
+	virtual QDir librariesPath() const;
+	virtual QDir versionsPath() const;
+	virtual bool providesVersionFile() const;
+
+	bool reload() override;
+
+	virtual QStringList extraArguments() const override;
+
+	std::shared_ptr<OneSixInstance> getSharedPtr();
+
+	virtual QString typeName() const override;
+
+	bool canExport() const override
+	{
+		return true;
+	}
+
+signals:
+	void versionReloaded();
+
+private:
+	QStringList processMinecraftArgs(AuthSessionPtr account);
+
+protected:
+	std::shared_ptr<MinecraftProfile> m_profile;
+	mutable std::shared_ptr<ModList> m_loader_mod_list;
+	mutable std::shared_ptr<ModList> m_core_mod_list;
+	mutable std::shared_ptr<ModList> m_resource_pack_list;
+	mutable std::shared_ptr<ModList> m_texture_pack_list;
+	mutable std::shared_ptr<WorldList> m_world_list;
+};
+
+Q_DECLARE_METATYPE(std::shared_ptr<OneSixInstance>)
diff --git a/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp b/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp
new file mode 100644
index 00000000..af42286d
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp
@@ -0,0 +1,418 @@
+#include "OneSixProfileStrategy.h"
+#include "OneSixInstance.h"
+#include "OneSixVersionFormat.h"
+
+#include "minecraft/VersionBuildError.h"
+#include "minecraft/MinecraftVersionList.h"
+#include "Env.h"
+#include <FileSystem.h>
+
+#include <QDir>
+#include <QUuid>
+#include <QJsonDocument>
+#include <QJsonArray>
+
+OneSixProfileStrategy::OneSixProfileStrategy(OneSixInstance* instance)
+{
+	m_instance = instance;
+}
+
+void OneSixProfileStrategy::upgradeDeprecatedFiles()
+{
+	auto versionJsonPath = FS::PathCombine(m_instance->instanceRoot(), "version.json");
+	auto customJsonPath = FS::PathCombine(m_instance->instanceRoot(), "custom.json");
+	auto mcJson = FS::PathCombine(m_instance->instanceRoot(), "patches" , "net.minecraft.json");
+
+	QString sourceFile;
+	QString renameFile;
+
+	// convert old crap.
+	if(QFile::exists(customJsonPath))
+	{
+		sourceFile = customJsonPath;
+		renameFile = versionJsonPath;
+	}
+	else if(QFile::exists(versionJsonPath))
+	{
+		sourceFile = versionJsonPath;
+	}
+	if(!sourceFile.isEmpty() && !QFile::exists(mcJson))
+	{
+		if(!FS::ensureFilePathExists(mcJson))
+		{
+			qWarning() << "Couldn't create patches folder for" << m_instance->name();
+			return;
+		}
+		if(!renameFile.isEmpty() && QFile::exists(renameFile))
+		{
+			if(!QFile::rename(renameFile, renameFile + ".old"))
+			{
+				qWarning() << "Couldn't rename" << renameFile << "to" << renameFile + ".old" << "in" << m_instance->name();
+				return;
+			}
+		}
+		auto file = ProfileUtils::parseJsonFile(QFileInfo(sourceFile), false);
+		ProfileUtils::removeLwjglFromPatch(file);
+		file->fileId = "net.minecraft";
+		file->version = file->minecraftVersion;
+		file->name = "Minecraft";
+		auto data = OneSixVersionFormat::versionFileToJson(file, false).toJson();
+		QSaveFile newPatchFile(mcJson);
+		if(!newPatchFile.open(QIODevice::WriteOnly))
+		{
+			newPatchFile.cancelWriting();
+			qWarning() << "Couldn't open main patch for writing in" << m_instance->name();
+			return;
+		}
+		newPatchFile.write(data);
+		if(!newPatchFile.commit())
+		{
+			qWarning() << "Couldn't save main patch in" << m_instance->name();
+			return;
+		}
+		if(!QFile::rename(sourceFile, sourceFile + ".old"))
+		{
+			qWarning() << "Couldn't rename" << sourceFile << "to" << sourceFile + ".old" << "in" << m_instance->name();
+			return;
+		}
+	}
+}
+
+void OneSixProfileStrategy::loadDefaultBuiltinPatches()
+{
+	{
+		auto mcJson = FS::PathCombine(m_instance->instanceRoot(), "patches" , "net.minecraft.json");
+		// load up the base minecraft patch
+		ProfilePatchPtr minecraftPatch;
+		if(QFile::exists(mcJson))
+		{
+			auto file = ProfileUtils::parseJsonFile(QFileInfo(mcJson), false);
+			if(file->version.isEmpty())
+			{
+				file->version = m_instance->intendedVersionId();
+			}
+			file->setVanilla(false);
+			file->setRevertible(true);
+			minecraftPatch = std::dynamic_pointer_cast<ProfilePatch>(file);
+		}
+		else
+		{
+			auto mcversion = ENV.getVersion("net.minecraft", m_instance->intendedVersionId());
+			minecraftPatch = std::dynamic_pointer_cast<ProfilePatch>(mcversion);
+		}
+		if (!minecraftPatch)
+		{
+			throw VersionIncomplete("net.minecraft");
+		}
+		minecraftPatch->setOrder(-2);
+		profile->appendPatch(minecraftPatch);
+	}
+
+	{
+		auto lwjglJson = FS::PathCombine(m_instance->instanceRoot(), "patches" , "org.lwjgl.json");
+		ProfilePatchPtr lwjglPatch;
+		if(QFile::exists(lwjglJson))
+		{
+			auto file = ProfileUtils::parseJsonFile(QFileInfo(lwjglJson), false);
+			file->setVanilla(false);
+			file->setRevertible(true);
+			lwjglPatch = std::dynamic_pointer_cast<ProfilePatch>(file);
+		}
+		else
+		{
+			// NOTE: this is obviously fake, is fixed in unstable.
+			QResource LWJGL(":/versions/LWJGL/2.9.1.json");
+			auto lwjgl = ProfileUtils::parseJsonFile(LWJGL.absoluteFilePath(), false);
+			lwjgl->setVanilla(true);
+			lwjgl->setCustomizable(true);
+			lwjglPatch = std::dynamic_pointer_cast<ProfilePatch>(lwjgl);
+		}
+		if (!lwjglPatch)
+		{
+			throw VersionIncomplete("org.lwjgl");
+		}
+		lwjglPatch->setOrder(-1);
+		profile->appendPatch(lwjglPatch);
+	}
+}
+
+void OneSixProfileStrategy::loadUserPatches()
+{
+	// load all patches, put into map for ordering, apply in the right order
+	ProfileUtils::PatchOrder userOrder;
+	ProfileUtils::readOverrideOrders(FS::PathCombine(m_instance->instanceRoot(), "order.json"), userOrder);
+	QDir patches(FS::PathCombine(m_instance->instanceRoot(),"patches"));
+	QSet<QString> seen_extra;
+
+	// first, load things by sort order.
+	for (auto id : userOrder)
+	{
+		// ignore builtins
+		if (id == "net.minecraft")
+			continue;
+		if (id == "org.lwjgl")
+			continue;
+		// parse the file
+		QString filename = patches.absoluteFilePath(id + ".json");
+		QFileInfo finfo(filename);
+		if(!finfo.exists())
+		{
+			qDebug() << "Patch file " << filename << " was deleted by external means...";
+			continue;
+		}
+		qDebug() << "Reading" << filename << "by user order";
+		VersionFilePtr file = ProfileUtils::parseJsonFile(finfo, false);
+		// sanity check. prevent tampering with files.
+		if (file->fileId != id)
+		{
+			file->addProblem(PROBLEM_WARNING, QObject::tr("load id %1 does not match internal id %2").arg(id, file->fileId));
+			seen_extra.insert(file->fileId);
+		}
+		file->setRemovable(true);
+		file->setMovable(true);
+		profile->appendPatch(file);
+	}
+	// now load the rest by internal preference.
+	QMultiMap<int, VersionFilePtr> files;
+	for (auto info : patches.entryInfoList(QStringList() << "*.json", QDir::Files))
+	{
+		// parse the file
+		qDebug() << "Reading" << info.fileName();
+		auto file = ProfileUtils::parseJsonFile(info, true);
+		// ignore builtins
+		if (file->fileId == "net.minecraft")
+			continue;
+		if (file->fileId == "org.lwjgl")
+			continue;
+		// do not load versions with broken IDs twice
+		if(seen_extra.contains(file->fileId))
+			continue;
+		// do not load what we already loaded in the first pass
+		if (userOrder.contains(file->fileId))
+			continue;
+		file->setRemovable(true);
+		file->setMovable(true);
+		files.insert(file->order, file);
+	}
+	QSet<int> seen;
+	for (auto order : files.keys())
+	{
+		if(seen.contains(order))
+			continue;
+		seen.insert(order);
+		const auto &values = files.values(order);
+		if(values.size() == 1)
+		{
+			profile->appendPatch(values[0]);
+			continue;
+		}
+		for(auto &file: values)
+		{
+			QStringList list;
+			for(auto &file2: values)
+			{
+				if(file != file2)
+					list.append(file2->name);
+			}
+			file->addProblem(PROBLEM_WARNING, QObject::tr("%1 has the same order as the following components:\n%2").arg(file->name, list.join(", ")));
+			profile->appendPatch(file);
+		}
+	}
+}
+
+
+void OneSixProfileStrategy::load()
+{
+	profile->clearPatches();
+
+	upgradeDeprecatedFiles();
+	loadDefaultBuiltinPatches();
+	loadUserPatches();
+}
+
+bool OneSixProfileStrategy::saveOrder(ProfileUtils::PatchOrder order)
+{
+	return ProfileUtils::writeOverrideOrders(FS::PathCombine(m_instance->instanceRoot(), "order.json"), order);
+}
+
+bool OneSixProfileStrategy::resetOrder()
+{
+	return QDir(m_instance->instanceRoot()).remove("order.json");
+}
+
+bool OneSixProfileStrategy::removePatch(ProfilePatchPtr patch)
+{
+	bool ok = true;
+	// first, remove the patch file. this ensures it's not used anymore
+	auto fileName = patch->getFilename();
+	if(fileName.size())
+	{
+		QFile patchFile(fileName);
+		if(patchFile.exists() && !patchFile.remove())
+		{
+			qCritical() << "File" << fileName << "could not be removed because:" << patchFile.errorString();
+			return false;
+		}
+	}
+
+
+	auto preRemoveJarMod = [&](JarmodPtr jarMod) -> bool
+	{
+		QString fullpath = FS::PathCombine(m_instance->jarModsDir(), jarMod->name);
+		QFileInfo finfo (fullpath);
+		if(finfo.exists())
+		{
+			QFile jarModFile(fullpath);
+			if(!jarModFile.remove())
+			{
+				qCritical() << "File" << fullpath << "could not be removed because:" << jarModFile.errorString();
+				return false;
+			}
+			return true;
+		}
+		return true;
+	};
+
+	for(auto &jarmod: patch->getJarMods())
+	{
+		ok &= preRemoveJarMod(jarmod);
+	}
+	return ok;
+}
+
+bool OneSixProfileStrategy::customizePatch(ProfilePatchPtr patch)
+{
+	if(patch->isCustom())
+	{
+		return false;
+	}
+
+	auto filename = FS::PathCombine(m_instance->instanceRoot(), "patches" , patch->getID() + ".json");
+	if(!FS::ensureFilePathExists(filename))
+	{
+		return false;
+	}
+	try
+	{
+		QSaveFile jsonFile(filename);
+		if(!jsonFile.open(QIODevice::WriteOnly))
+		{
+			return false;
+		}
+		auto vfile = patch->getVersionFile();
+		if(!vfile)
+		{
+			return false;
+		}
+		auto document = OneSixVersionFormat::versionFileToJson(vfile, true);
+		jsonFile.write(document.toJson());
+		if(!jsonFile.commit())
+		{
+			return false;
+		}
+		load();
+	}
+	catch (VersionIncomplete &error)
+	{
+		qDebug() << "Version was incomplete:" << error.cause();
+	}
+	catch (Exception &error)
+	{
+		qWarning() << "Version could not be loaded:" << error.cause();
+	}
+	return true;
+}
+
+bool OneSixProfileStrategy::revertPatch(ProfilePatchPtr patch)
+{
+	if(!patch->isCustom())
+	{
+		// already not custom
+		return true;
+	}
+	auto filename = patch->getFilename();
+	if(!QFile::exists(filename))
+	{
+		// already gone / not custom
+		return true;
+	}
+	// just kill the file and reload
+	bool result = QFile::remove(filename);
+	try
+	{
+		load();
+	}
+	catch (VersionIncomplete &error)
+	{
+		qDebug() << "Version was incomplete:" << error.cause();
+	}
+	catch (Exception &error)
+	{
+		qWarning() << "Version could not be loaded:" << error.cause();
+	}
+	return result;
+}
+
+bool OneSixProfileStrategy::installJarMods(QStringList filepaths)
+{
+	QString patchDir = FS::PathCombine(m_instance->instanceRoot(), "patches");
+	if(!FS::ensureFolderPathExists(patchDir))
+	{
+		return false;
+	}
+
+	if (!FS::ensureFolderPathExists(m_instance->jarModsDir()))
+	{
+		return false;
+	}
+
+	for(auto filepath:filepaths)
+	{
+		QFileInfo sourceInfo(filepath);
+		auto uuid = QUuid::createUuid();
+		QString id = uuid.toString().remove('{').remove('}');
+		QString target_filename = id + ".jar";
+		QString target_id = "org.multimc.jarmod." + id;
+		QString target_name = sourceInfo.completeBaseName() + " (jar mod)";
+		QString finalPath = FS::PathCombine(m_instance->jarModsDir(), target_filename);
+
+		QFileInfo targetInfo(finalPath);
+		if(targetInfo.exists())
+		{
+			return false;
+		}
+
+		if (!QFile::copy(sourceInfo.absoluteFilePath(),QFileInfo(finalPath).absoluteFilePath()))
+		{
+			return false;
+		}
+
+		auto f = std::make_shared<VersionFile>();
+		auto jarMod = std::make_shared<Jarmod>();
+		jarMod->name = target_filename;
+		jarMod->originalName = sourceInfo.completeBaseName();
+		f->jarMods.append(jarMod);
+		f->name = target_name;
+		f->fileId = target_id;
+		f->order = profile->getFreeOrderNumber();
+		QString patchFileName = FS::PathCombine(patchDir, target_id + ".json");
+		f->filename = patchFileName;
+		f->setMovable(true);
+		f->setRemovable(true);
+
+		QFile file(patchFileName);
+		if (!file.open(QFile::WriteOnly))
+		{
+			qCritical() << "Error opening" << file.fileName()
+						<< "for reading:" << file.errorString();
+			return false;
+		}
+		file.write(OneSixVersionFormat::versionFileToJson(f, true).toJson());
+		file.close();
+		profile->appendPatch(f);
+	}
+	profile->saveCurrentOrder();
+	profile->reapplyPatches();
+	return true;
+}
+
diff --git a/api/logic/minecraft/onesix/OneSixProfileStrategy.h b/api/logic/minecraft/onesix/OneSixProfileStrategy.h
new file mode 100644
index 00000000..96c1ba7b
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixProfileStrategy.h
@@ -0,0 +1,26 @@
+#pragma once
+#include "minecraft/ProfileStrategy.h"
+
+class OneSixInstance;
+
+class OneSixProfileStrategy : public ProfileStrategy
+{
+public:
+	OneSixProfileStrategy(OneSixInstance * instance);
+	virtual ~OneSixProfileStrategy() {};
+	virtual void load() override;
+	virtual bool resetOrder() override;
+	virtual bool saveOrder(ProfileUtils::PatchOrder order) override;
+	virtual bool installJarMods(QStringList filepaths) override;
+	virtual bool removePatch(ProfilePatchPtr patch) override;
+	virtual bool customizePatch(ProfilePatchPtr patch) override;
+	virtual bool revertPatch(ProfilePatchPtr patch) override;
+
+protected:
+	virtual void loadDefaultBuiltinPatches();
+	virtual void loadUserPatches();
+	void upgradeDeprecatedFiles();
+
+protected:
+	OneSixInstance *m_instance;
+};
diff --git a/api/logic/minecraft/onesix/OneSixUpdate.cpp b/api/logic/minecraft/onesix/OneSixUpdate.cpp
new file mode 100644
index 00000000..1c2cd196
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixUpdate.cpp
@@ -0,0 +1,342 @@
+/* Copyright 2013-2015 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 "Env.h"
+#include <minecraft/forge/ForgeXzDownload.h>
+#include "OneSixUpdate.h"
+#include "OneSixInstance.h"
+
+#include <QtNetwork>
+
+#include <QFile>
+#include <QFileInfo>
+#include <QTextStream>
+#include <QDataStream>
+#include <JlCompress.h>
+
+#include "BaseInstance.h"
+#include "minecraft/MinecraftVersionList.h"
+#include "minecraft/MinecraftProfile.h"
+#include "minecraft/Library.h"
+#include "net/URLConstants.h"
+#include "minecraft/AssetsUtils.h"
+#include "Exception.h"
+#include "MMCZip.h"
+#include <FileSystem.h>
+
+OneSixUpdate::OneSixUpdate(OneSixInstance *inst, QObject *parent) : Task(parent), m_inst(inst)
+{
+}
+
+void OneSixUpdate::executeTask()
+{
+	// Make directories
+	QDir mcDir(m_inst->minecraftRoot());
+	if (!mcDir.exists() && !mcDir.mkpath("."))
+	{
+		emitFailed(tr("Failed to create folder for minecraft binaries."));
+		return;
+	}
+
+	// Get a pointer to the version object that corresponds to the instance's version.
+	targetVersion = std::dynamic_pointer_cast<MinecraftVersion>(ENV.getVersion("net.minecraft", m_inst->intendedVersionId()));
+	if (targetVersion == nullptr)
+	{
+		// don't do anything if it was invalid
+		emitFailed(tr("The specified Minecraft version is invalid. Choose a different one."));
+		return;
+	}
+	if (m_inst->providesVersionFile() || !targetVersion->needsUpdate())
+	{
+		qDebug() << "Instance either provides a version file or doesn't need an update.";
+		jarlibStart();
+		return;
+	}
+	versionUpdateTask = std::dynamic_pointer_cast<MinecraftVersionList>(ENV.getVersionList("net.minecraft"))->createUpdateTask(m_inst->intendedVersionId());
+	if (!versionUpdateTask)
+	{
+		qDebug() << "Didn't spawn an update task.";
+		jarlibStart();
+		return;
+	}
+	connect(versionUpdateTask.get(), SIGNAL(succeeded()), SLOT(jarlibStart()));
+	connect(versionUpdateTask.get(), &NetJob::failed, this, &OneSixUpdate::versionUpdateFailed);
+	connect(versionUpdateTask.get(), SIGNAL(progress(qint64, qint64)), SIGNAL(progress(qint64, qint64)));
+	setStatus(tr("Getting the version files from Mojang..."));
+	versionUpdateTask->start();
+}
+
+void OneSixUpdate::versionUpdateFailed(QString reason)
+{
+	emitFailed(reason);
+}
+
+void OneSixUpdate::assetIndexStart()
+{
+	setStatus(tr("Updating assets index..."));
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	auto profile = inst->getMinecraftProfile();
+	auto assets = profile->getMinecraftAssets();
+	QUrl indexUrl = assets->url;
+	QString localPath = assets->id + ".json";
+	auto job = new NetJob(tr("Asset index for %1").arg(inst->name()));
+
+	auto metacache = ENV.metacache();
+	auto entry = metacache->resolveEntry("asset_indexes", localPath);
+	entry->setStale(true);
+	job->addNetAction(CacheDownload::make(indexUrl, entry));
+	jarlibDownloadJob.reset(job);
+
+	connect(jarlibDownloadJob.get(), SIGNAL(succeeded()), SLOT(assetIndexFinished()));
+	connect(jarlibDownloadJob.get(), &NetJob::failed, this, &OneSixUpdate::assetIndexFailed);
+	connect(jarlibDownloadJob.get(), SIGNAL(progress(qint64, qint64)), SIGNAL(progress(qint64, qint64)));
+
+	qDebug() << m_inst->name() << ": Starting asset index download";
+	jarlibDownloadJob->start();
+}
+
+void OneSixUpdate::assetIndexFinished()
+{
+	AssetsIndex index;
+	qDebug() << m_inst->name() << ": Finished asset index download";
+
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	auto profile = inst->getMinecraftProfile();
+	auto assets = profile->getMinecraftAssets();
+
+	QString asset_fname = "assets/indexes/" + assets->id + ".json";
+	// FIXME: this looks like a job for a generic validator based on json schema?
+	if (!AssetsUtils::loadAssetsIndexJson(assets->id, asset_fname, &index))
+	{
+		auto metacache = ENV.metacache();
+		auto entry = metacache->resolveEntry("asset_indexes", assets->id + ".json");
+		metacache->evictEntry(entry);
+		emitFailed(tr("Failed to read the assets index!"));
+	}
+
+	auto job = index.getDownloadJob();
+	if(job)
+	{
+		setStatus(tr("Getting the assets files from Mojang..."));
+		jarlibDownloadJob = job;
+		connect(jarlibDownloadJob.get(), SIGNAL(succeeded()), SLOT(assetsFinished()));
+		connect(jarlibDownloadJob.get(), &NetJob::failed, this, &OneSixUpdate::assetsFailed);
+		connect(jarlibDownloadJob.get(), SIGNAL(progress(qint64, qint64)), SIGNAL(progress(qint64, qint64)));
+		jarlibDownloadJob->start();
+		return;
+	}
+	assetsFinished();
+}
+
+void OneSixUpdate::assetIndexFailed(QString reason)
+{
+	qDebug() << m_inst->name() << ": Failed asset index download";
+	emitFailed(tr("Failed to download the assets index:\n%1").arg(reason));
+}
+
+void OneSixUpdate::assetsFinished()
+{
+	emitSucceeded();
+}
+
+void OneSixUpdate::assetsFailed(QString reason)
+{
+	emitFailed(tr("Failed to download assets:\n%1").arg(reason));
+}
+
+void OneSixUpdate::jarlibStart()
+{
+	setStatus(tr("Getting the library files from Mojang..."));
+	qDebug() << m_inst->name() << ": downloading libraries";
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	inst->reloadProfile();
+	if(inst->flags() & BaseInstance::VersionBrokenFlag)
+	{
+		emitFailed(tr("Failed to load the version description files - check the instance for errors."));
+		return;
+	}
+
+	// Build a list of URLs that will need to be downloaded.
+	std::shared_ptr<MinecraftProfile> profile = inst->getMinecraftProfile();
+	// minecraft.jar for this version
+	{
+		QString version_id = profile->getMinecraftVersion();
+		QString localPath = version_id + "/" + version_id + ".jar";
+		QString urlstr = profile->getMainJarUrl();
+
+		auto job = new NetJob(tr("Libraries for instance %1").arg(inst->name()));
+
+		auto metacache = ENV.metacache();
+		auto entry = metacache->resolveEntry("versions", localPath);
+		job->addNetAction(CacheDownload::make(QUrl(urlstr), entry));
+		jarlibDownloadJob.reset(job);
+	}
+
+	auto libs = profile->getLibraries();
+
+	auto metacache = ENV.metacache();
+	QList<LibraryPtr> brokenLocalLibs;
+
+	QStringList failedFiles;
+	for (auto lib : libs)
+	{
+		auto dls = lib->getDownloads(currentSystem, metacache.get(), failedFiles);
+		for(auto dl : dls)
+		{
+			jarlibDownloadJob->addNetAction(dl);
+		}
+	}
+	if (!brokenLocalLibs.empty())
+	{
+		jarlibDownloadJob.reset();
+
+		QString failed_all = failedFiles.join("\n");
+		emitFailed(tr("Some libraries marked as 'local' are missing their jar "
+					  "files:\n%1\n\nYou'll have to correct this problem manually. If this is "
+					  "an externally tracked instance, make sure to run it at least once "
+					  "outside of MultiMC.").arg(failed_all));
+		return;
+	}
+
+	connect(jarlibDownloadJob.get(), SIGNAL(succeeded()), SLOT(jarlibFinished()));
+	connect(jarlibDownloadJob.get(), &NetJob::failed, this, &OneSixUpdate::jarlibFailed);
+	connect(jarlibDownloadJob.get(), SIGNAL(progress(qint64, qint64)),
+			SIGNAL(progress(qint64, qint64)));
+
+	jarlibDownloadJob->start();
+}
+
+void OneSixUpdate::jarlibFinished()
+{
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	std::shared_ptr<MinecraftProfile> profile = inst->getMinecraftProfile();
+
+	if (profile->hasTrait("legacyFML"))
+	{
+		fmllibsStart();
+	}
+	else
+	{
+		assetIndexStart();
+	}
+}
+
+void OneSixUpdate::jarlibFailed(QString reason)
+{
+	QStringList failed = jarlibDownloadJob->getFailedFiles();
+	QString failed_all = failed.join("\n");
+	emitFailed(
+		tr("Failed to download the following files:\n%1\n\nReason:%2\nPlease try again.").arg(failed_all, reason));
+}
+
+void OneSixUpdate::fmllibsStart()
+{
+	// Get the mod list
+	OneSixInstance *inst = (OneSixInstance *)m_inst;
+	std::shared_ptr<MinecraftProfile> profile = inst->getMinecraftProfile();
+	bool forge_present = false;
+
+	QString version = inst->intendedVersionId();
+	auto &fmlLibsMapping = g_VersionFilterData.fmlLibsMapping;
+	if (!fmlLibsMapping.contains(version))
+	{
+		assetIndexStart();
+		return;
+	}
+
+	auto &libList = fmlLibsMapping[version];
+
+	// determine if we need some libs for FML or forge
+	setStatus(tr("Checking for FML libraries..."));
+	forge_present = (profile->versionPatch("net.minecraftforge") != nullptr);
+	// we don't...
+	if (!forge_present)
+	{
+		assetIndexStart();
+		return;
+	}
+
+	// now check the lib folder inside the instance for files.
+	for (auto &lib : libList)
+	{
+		QFileInfo libInfo(FS::PathCombine(inst->libDir(), lib.filename));
+		if (libInfo.exists())
+			continue;
+		fmlLibsToProcess.append(lib);
+	}
+
+	// if everything is in place, there's nothing to do here...
+	if (fmlLibsToProcess.isEmpty())
+	{
+		assetIndexStart();
+		return;
+	}
+
+	// download missing libs to our place
+	setStatus(tr("Dowloading FML libraries..."));
+	auto dljob = new NetJob("FML libraries");
+	auto metacache = ENV.metacache();
+	for (auto &lib : fmlLibsToProcess)
+	{
+		auto entry = metacache->resolveEntry("fmllibs", lib.filename);
+		QString urlString = lib.ours ? URLConstants::FMLLIBS_OUR_BASE_URL + lib.filename
+									 : URLConstants::FMLLIBS_FORGE_BASE_URL + lib.filename;
+		dljob->addNetAction(CacheDownload::make(QUrl(urlString), entry));
+	}
+
+	connect(dljob, SIGNAL(succeeded()), SLOT(fmllibsFinished()));
+	connect(dljob, &NetJob::failed, this, &OneSixUpdate::fmllibsFailed);
+	connect(dljob, SIGNAL(progress(qint64, qint64)), SIGNAL(progress(qint64, qint64)));
+	legacyDownloadJob.reset(dljob);
+	legacyDownloadJob->start();
+}
+
+void OneSixUpdate::fmllibsFinished()
+{
+	legacyDownloadJob.reset();
+	if (!fmlLibsToProcess.isEmpty())
+	{
+		setStatus(tr("Copying FML libraries into the instance..."));
+		OneSixInstance *inst = (OneSixInstance *)m_inst;
+		auto metacache = ENV.metacache();
+		int index = 0;
+		for (auto &lib : fmlLibsToProcess)
+		{
+			progress(index, fmlLibsToProcess.size());
+			auto entry = metacache->resolveEntry("fmllibs", lib.filename);
+			auto path = FS::PathCombine(inst->libDir(), lib.filename);
+			if (!FS::ensureFilePathExists(path))
+			{
+				emitFailed(tr("Failed creating FML library folder inside the instance."));
+				return;
+			}
+			if (!QFile::copy(entry->getFullPath(), FS::PathCombine(inst->libDir(), lib.filename)))
+			{
+				emitFailed(tr("Failed copying Forge/FML library: %1.").arg(lib.filename));
+				return;
+			}
+			index++;
+		}
+		progress(index, fmlLibsToProcess.size());
+	}
+	assetIndexStart();
+}
+
+void OneSixUpdate::fmllibsFailed(QString reason)
+{
+	emitFailed(tr("Game update failed: it was impossible to fetch the required FML libraries.\nReason:\n%1").arg(reason));
+	return;
+}
+
diff --git a/api/logic/minecraft/onesix/OneSixUpdate.h b/api/logic/minecraft/onesix/OneSixUpdate.h
new file mode 100644
index 00000000..b5195364
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixUpdate.h
@@ -0,0 +1,67 @@
+/* Copyright 2013-2015 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.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QList>
+#include <QUrl>
+
+#include "net/NetJob.h"
+#include "tasks/Task.h"
+#include "minecraft/VersionFilterData.h"
+#include <quazip.h>
+
+class MinecraftVersion;
+class OneSixInstance;
+
+class OneSixUpdate : public Task
+{
+	Q_OBJECT
+public:
+	explicit OneSixUpdate(OneSixInstance *inst, QObject *parent = 0);
+	virtual void executeTask();
+
+private
+slots:
+	void versionUpdateFailed(QString reason);
+
+	void jarlibStart();
+	void jarlibFinished();
+	void jarlibFailed(QString reason);
+
+	void fmllibsStart();
+	void fmllibsFinished();
+	void fmllibsFailed(QString reason);
+
+	void assetIndexStart();
+	void assetIndexFinished();
+	void assetIndexFailed(QString reason);
+
+	void assetsFinished();
+	void assetsFailed(QString reason);
+
+private:
+	NetJobPtr jarlibDownloadJob;
+	NetJobPtr legacyDownloadJob;
+
+	/// target version, determined during this task
+	std::shared_ptr<MinecraftVersion> targetVersion;
+	/// the task that is spawned for version updates
+	std::shared_ptr<Task> versionUpdateTask;
+
+	OneSixInstance *m_inst = nullptr;
+	QList<FMLlib> fmlLibsToProcess;
+};
diff --git a/api/logic/minecraft/onesix/OneSixVersionFormat.cpp b/api/logic/minecraft/onesix/OneSixVersionFormat.cpp
new file mode 100644
index 00000000..541fb109
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixVersionFormat.cpp
@@ -0,0 +1,225 @@
+#include "OneSixVersionFormat.h"
+#include <Json.h>
+#include "minecraft/ParseUtils.h"
+#include <minecraft/MinecraftVersion.h>
+#include <minecraft/VersionBuildError.h>
+#include <minecraft/MojangVersionFormat.h>
+
+using namespace Json;
+
+static void readString(const QJsonObject &root, const QString &key, QString &variable)
+{
+	if (root.contains(key))
+	{
+		variable = requireString(root.value(key));
+	}
+}
+
+LibraryPtr OneSixVersionFormat::libraryFromJson(const QJsonObject &libObj, const QString &filename)
+{
+	LibraryPtr out = MojangVersionFormat::libraryFromJson(libObj, filename);
+	readString(libObj, "MMC-hint", out->m_hint);
+	readString(libObj, "MMC-absulute_url", out->m_absoluteURL);
+	readString(libObj, "MMC-absoluteUrl", out->m_absoluteURL);
+	return out;
+}
+
+QJsonObject OneSixVersionFormat::libraryToJson(Library *library)
+{
+	QJsonObject libRoot = MojangVersionFormat::libraryToJson(library);
+	if (library->m_absoluteURL.size())
+		libRoot.insert("MMC-absoluteUrl", library->m_absoluteURL);
+	if (library->m_hint.size())
+		libRoot.insert("MMC-hint", library->m_hint);
+	return libRoot;
+}
+
+VersionFilePtr OneSixVersionFormat::versionFileFromJson(const QJsonDocument &doc, const QString &filename, const bool requireOrder)
+{
+	VersionFilePtr out(new VersionFile());
+	if (doc.isEmpty() || doc.isNull())
+	{
+		throw JSONValidationError(filename + " is empty or null");
+	}
+	if (!doc.isObject())
+	{
+		throw JSONValidationError(filename + " is not an object");
+	}
+
+	QJsonObject root = doc.object();
+
+	if (requireOrder)
+	{
+		if (root.contains("order"))
+		{
+			out->order = requireInteger(root.value("order"));
+		}
+		else
+		{
+			// FIXME: evaluate if we don't want to throw exceptions here instead
+			qCritical() << filename << "doesn't contain an order field";
+		}
+	}
+
+	out->name = root.value("name").toString();
+	out->fileId = root.value("fileId").toString();
+	out->version = root.value("version").toString();
+	out->dependsOnMinecraftVersion = root.value("mcVersion").toString();
+	out->filename = filename;
+
+	MojangVersionFormat::readVersionProperties(root, out.get());
+
+	// added for legacy Minecraft window embedding, TODO: remove
+	readString(root, "appletClass", out->appletClass);
+
+	if (root.contains("+tweakers"))
+	{
+		for (auto tweakerVal : requireArray(root.value("+tweakers")))
+		{
+			out->addTweakers.append(requireString(tweakerVal));
+		}
+	}
+
+	if (root.contains("+traits"))
+	{
+		for (auto tweakerVal : requireArray(root.value("+traits")))
+		{
+			out->traits.insert(requireString(tweakerVal));
+		}
+	}
+
+	if (root.contains("+jarMods"))
+	{
+		for (auto libVal : requireArray(root.value("+jarMods")))
+		{
+			QJsonObject libObj = requireObject(libVal);
+			// parse the jarmod
+			auto lib = OneSixVersionFormat::jarModFromJson(libObj, filename, out->name);
+			if(lib->originalName.isEmpty())
+			{
+				auto fixed = out->name;
+				fixed.remove(" (jar mod)");
+				lib->originalName = out->name;
+			}
+			// and add to jar mods
+			out->jarMods.append(lib);
+		}
+	}
+
+	auto readLibs = [&](const char * which)
+	{
+		for (auto libVal : requireArray(root.value(which)))
+		{
+			QJsonObject libObj = requireObject(libVal);
+			// parse the library
+			auto lib = libraryFromJson(libObj, filename);
+			out->libraries.append(lib);
+		}
+	};
+	bool hasPlusLibs = root.contains("+libraries");
+	bool hasLibs = root.contains("libraries");
+	if (hasPlusLibs && hasLibs)
+	{
+		out->addProblem(PROBLEM_WARNING, QObject::tr("Version file has both '+libraries' and 'libraries'. This is no longer supported."));
+		readLibs("libraries");
+		readLibs("+libraries");
+	}
+	else if (hasLibs)
+	{
+		readLibs("libraries");
+	}
+	else if(hasPlusLibs)
+	{
+		readLibs("+libraries");
+	}
+
+	/* removed features that shouldn't be used */
+	if (root.contains("tweakers"))
+	{
+		out->addProblem(PROBLEM_ERROR, QObject::tr("Version file contains unsupported element 'tweakers'"));
+	}
+	if (root.contains("-libraries"))
+	{
+		out->addProblem(PROBLEM_ERROR, QObject::tr("Version file contains unsupported element '-libraries'"));
+	}
+	if (root.contains("-tweakers"))
+	{
+		out->addProblem(PROBLEM_ERROR, QObject::tr("Version file contains unsupported element '-tweakers'"));
+	}
+	if (root.contains("-minecraftArguments"))
+	{
+		out->addProblem(PROBLEM_ERROR, QObject::tr("Version file contains unsupported element '-minecraftArguments'"));
+	}
+	if (root.contains("+minecraftArguments"))
+	{
+		out->addProblem(PROBLEM_ERROR, QObject::tr("Version file contains unsupported element '+minecraftArguments'"));
+	}
+	return out;
+}
+
+QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch, bool saveOrder)
+{
+	QJsonObject root;
+	if (saveOrder)
+	{
+		root.insert("order", patch->order);
+	}
+	writeString(root, "name", patch->name);
+	writeString(root, "fileId", patch->fileId);
+	writeString(root, "version", patch->version);
+	writeString(root, "mcVersion", patch->dependsOnMinecraftVersion);
+
+	MojangVersionFormat::writeVersionProperties(patch.get(), root);
+
+	writeString(root, "appletClass", patch->appletClass);
+	writeStringList(root, "+tweakers", patch->addTweakers);
+	writeStringList(root, "+traits", patch->traits.toList());
+	if (!patch->libraries.isEmpty())
+	{
+		QJsonArray array;
+		for (auto value: patch->libraries)
+		{
+			array.append(OneSixVersionFormat::libraryToJson(value.get()));
+		}
+		root.insert("+libraries", array);
+	}
+	if (!patch->jarMods.isEmpty())
+	{
+		QJsonArray array;
+		for (auto value: patch->jarMods)
+		{
+			array.append(OneSixVersionFormat::jarModtoJson(value.get()));
+		}
+		root.insert("+jarMods", array);
+	}
+	// write the contents to a json document.
+	{
+		QJsonDocument out;
+		out.setObject(root);
+		return out;
+	}
+}
+
+JarmodPtr OneSixVersionFormat::jarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName)
+{
+	JarmodPtr out(new Jarmod());
+	if (!libObj.contains("name"))
+	{
+		throw JSONValidationError(filename +
+								  "contains a jarmod that doesn't have a 'name' field");
+	}
+	out->name = libObj.value("name").toString();
+	out->originalName = libObj.value("originalName").toString();
+	return out;
+}
+
+QJsonObject OneSixVersionFormat::jarModtoJson(Jarmod *jarmod)
+{
+	QJsonObject out;
+	writeString(out, "name", jarmod->name);
+	if(!jarmod->originalName.isEmpty())
+	{
+		writeString(out, "originalName", jarmod->originalName);
+	}
+	return out;
+}
diff --git a/api/logic/minecraft/onesix/OneSixVersionFormat.h b/api/logic/minecraft/onesix/OneSixVersionFormat.h
new file mode 100644
index 00000000..5696e79e
--- /dev/null
+++ b/api/logic/minecraft/onesix/OneSixVersionFormat.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <minecraft/VersionFile.h>
+#include <minecraft/MinecraftProfile.h>
+#include <minecraft/Library.h>
+#include <QJsonDocument>
+
+class OneSixVersionFormat
+{
+public:
+	// version files / profile patches
+	static VersionFilePtr versionFileFromJson(const QJsonDocument &doc, const QString &filename, const bool requireOrder);
+	static QJsonDocument versionFileToJson(const VersionFilePtr &patch, bool saveOrder);
+
+	// libraries
+	static LibraryPtr libraryFromJson(const QJsonObject &libObj, const QString &filename);
+	static QJsonObject libraryToJson(Library *library);
+
+	// jar mods
+	static JarmodPtr jarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName);
+	static QJsonObject jarModtoJson(Jarmod * jarmod);
+};