NOISSUE jar mods as libraries, fix for customizing net.minecraft

15 files changed, 186 insertions, 85 deletions

diff --git a/api/logic/CMakeLists.txt b/api/logic/CMakeLists.txt
index da673c13..c57d5783 100644
--- a/api/logic/CMakeLists.txt
+++ b/api/logic/CMakeLists.txt
@@ -249,7 +249,6 @@ set(MINECRAFT_SOURCES
 	minecraft/MinecraftProfile.h
 	minecraft/MojangVersionFormat.cpp
 	minecraft/MojangVersionFormat.h
-	minecraft/JarMod.h
 	minecraft/MinecraftInstance.cpp
 	minecraft/MinecraftInstance.h
 	minecraft/Rule.cpp
diff --git a/api/logic/minecraft/GradleSpecifier.h b/api/logic/minecraft/GradleSpecifier.h
index b05553bb..f842008c 100644
--- a/api/logic/minecraft/GradleSpecifier.h
+++ b/api/logic/minecraft/GradleSpecifier.h
@@ -65,13 +65,22 @@ struct GradleSpecifier
 		filename += "." + m_extension;
 		return filename;
 	}
-	QString toPath() const
+	QString toPath(const QString & filenameOverride = QString()) const
 	{
 		if(!m_valid)
 			return "INVALID";
+		QString filename;
+		if(filenameOverride.isEmpty())
+		{
+			filename = getFileName();
+		}
+		else
+		{
+			filename = filenameOverride;
+		}
 		QString path = m_groupId;
 		path.replace('.', '/');
-		path += '/' + m_artifactId + '/' + m_version + '/' + getFileName();
+		path += '/' + m_artifactId + '/' + m_version + '/' + filename;
 		return path;
 	}
 	inline bool valid() const
diff --git a/api/logic/minecraft/JarMod.h b/api/logic/minecraft/JarMod.h
deleted file mode 100644
index 42d05da9..00000000
--- a/api/logic/minecraft/JarMod.h
+++ /dev/null
@@ -1,12 +0,0 @@
-#pragma once
-#include <QString>
-#include <QJsonObject>
-#include <memory>
-class Jarmod;
-typedef std::shared_ptr<Jarmod> JarmodPtr;
-class Jarmod
-{
-public: /* data */
-	QString name;
-	QString originalName;
-};
diff --git a/api/logic/minecraft/Library.cpp b/api/logic/minecraft/Library.cpp
index a3b5f01c..22e1bd33 100644
--- a/api/logic/minecraft/Library.cpp
+++ b/api/logic/minecraft/Library.cpp
@@ -11,11 +11,11 @@
 void Library::getApplicableFiles(OpSys system, QStringList& jar, QStringList& native, QStringList& native32,
 								 QStringList& native64, const QString &overridePath) const
 {
-	bool isLocal = (hint() == "local");
+	bool local = isLocal();
 	auto actualPath = [&](QString relPath)
 	{
 		QFileInfo out(FS::PathCombine(storagePrefix(), relPath));
-		if(isLocal && !overridePath.isEmpty())
+		if(local && !overridePath.isEmpty())
 		{
 			QString fileName = out.fileName();
 			auto fullPath = FS::PathCombine(overridePath, fileName);
@@ -56,7 +56,7 @@ QList< std::shared_ptr< NetAction > > Library::getDownloads(OpSys system, class
 {
 	QList<NetActionPtr> out;
 	bool isAlwaysStale = (hint() == "always-stale");
-	bool isLocal = (hint() == "local");
+	bool local = isLocal();
 	bool isForge = (hint() == "forge-pack-xz");
 
 	auto add_download = [&](QString storage, QString url, QString sha1 = QString())
@@ -68,7 +68,7 @@ QList< std::shared_ptr< NetAction > > Library::getDownloads(OpSys system, class
 		}
 		if (!entry->isStale())
 			return true;
-		if(isLocal)
+		if(local)
 		{
 			if(!overridePath.isEmpty())
 			{
@@ -228,6 +228,11 @@ bool Library::isActive() const
 	return result;
 }
 
+bool Library::isLocal() const
+{
+	return m_hint == "local";
+}
+
 void Library::setStoragePrefix(QString prefix)
 {
 	m_storagePrefix = prefix;
@@ -247,12 +252,44 @@ QString Library::storagePrefix() const
 	return m_storagePrefix;
 }
 
+QString Library::filename(OpSys system) const
+{
+	if(!m_filename.isEmpty())
+	{
+		return m_filename;
+	}
+	// non-native? use only the gradle specifier
+	if (!isNative())
+	{
+		return m_name.getFileName();
+	}
+
+	// otherwise native, override classifiers. Mojang HACK!
+	GradleSpecifier nativeSpec = m_name;
+	if (m_nativeClassifiers.contains(system))
+	{
+		nativeSpec.setClassifier(m_nativeClassifiers[system]);
+	}
+	else
+	{
+		nativeSpec.setClassifier("INVALID");
+	}
+	return nativeSpec.getFileName();
+}
+
+QString Library::displayName(OpSys system) const
+{
+	if(!m_displayname.isEmpty())
+		return m_displayname;
+	return filename(system);
+}
+
 QString Library::storageSuffix(OpSys system) const
 {
 	// non-native? use only the gradle specifier
 	if (!isNative())
 	{
-		return m_name.toPath();
+		return m_name.toPath(m_filename);
 	}
 
 	// otherwise native, override classifiers. Mojang HACK!
@@ -265,5 +302,5 @@ QString Library::storageSuffix(OpSys system) const
 	{
 		nativeSpec.setClassifier("INVALID");
 	}
-	return nativeSpec.toPath();
+	return nativeSpec.toPath(m_filename);
 }
diff --git a/api/logic/minecraft/Library.h b/api/logic/minecraft/Library.h
index 6369c537..9577de33 100644
--- a/api/logic/minecraft/Library.h
+++ b/api/logic/minecraft/Library.h
@@ -48,6 +48,7 @@ public:
 		newlib->m_rules = base->m_rules;
 		newlib->m_storagePrefix = base->m_storagePrefix;
 		newlib->m_mojangDownloads = base->m_mojangDownloads;
+		newlib->m_filename = base->m_filename;
 		return newlib;
 	}
 
@@ -108,6 +109,23 @@ public: /* methods */
 		m_absoluteURL = absolute_url;
 	}
 
+	void setFilename(const QString &filename)
+	{
+		m_filename = filename;
+	}
+
+	/// Get the file name of the library
+	QString filename(OpSys system) const;
+
+	// DEPRECATED: set a display name, used by jar mods only
+	void setDisplayName(const QString & displayName)
+	{
+		m_displayname = displayName;
+	}
+
+	/// Get the file name of the library
+	QString displayName(OpSys system) const;
+
 	void setMojangDownloadInfo(MojangLibraryDownloadInfo::Ptr info)
 	{
 		m_mojangDownloads = info;
@@ -127,6 +145,9 @@ public: /* methods */
 	/// Returns true if the library should be loaded (or extracted, in case of natives)
 	bool isActive() const;
 
+	/// Returns true if the library is contained in an instance and false if it is shared
+	bool isLocal() const;
+
 	// Get a list of downloads for this library
 	QList<NetActionPtr> getDownloads(OpSys system, class HttpMetaCache * cache,
 									 QStringList & failedFiles, const QString & overridePath) const;
@@ -138,7 +159,7 @@ private: /* methods */
 	/// Get the prefix - root of the storage to be used
 	QString storagePrefix() const;
 
-	/// Get the relative path where the library should be saved
+	/// Get the relative file path where the library should be saved
 	QString storageSuffix(OpSys system) const;
 
 	QString hint() const
@@ -156,6 +177,12 @@ protected: /* data */
 	/// DEPRECATED: MultiMC-specific absolute URL. takes precedence over the implicit maven repo URL, if defined
 	QString m_absoluteURL;
 
+	/// MultiMC extension - filename override
+	QString m_filename;
+
+	/// DEPRECATED MultiMC extension - display name
+	QString m_displayname;
+
 	/**
 	 * MultiMC-specific type hint - modifies how the library is treated
 	 */
diff --git a/api/logic/minecraft/MinecraftProfile.cpp b/api/logic/minecraft/MinecraftProfile.cpp
index efe4651b..a82d892f 100644
--- a/api/logic/minecraft/MinecraftProfile.cpp
+++ b/api/logic/minecraft/MinecraftProfile.cpp
@@ -79,7 +79,7 @@ void MinecraftProfile::clear()
 	m_libraries.clear();
 	m_traits.clear();
 	m_jarMods.clear();
-	mojangDownloads.clear();
+	m_mainJar.reset();
 	m_problemSeverity = ProblemSeverity::None;
 }
 
@@ -437,18 +437,6 @@ void MinecraftProfile::applyMinecraftAssets(MojangAssetIndexInfo::Ptr assets)
 	}
 }
 
-void MinecraftProfile::applyMojangDownload(const QString &key, MojangDownloadInfo::Ptr download)
-{
-	if(download)
-	{
-		mojangDownloads[key] = download;
-	}
-	else
-	{
-		mojangDownloads.remove(key);
-	}
-}
-
 void MinecraftProfile::applyTraits(const QSet<QString>& traits)
 {
 	this->m_traits.unite(traits);
@@ -464,7 +452,7 @@ void MinecraftProfile::applyTweakers(const QStringList& tweakers)
 	}
 }
 
-void MinecraftProfile::applyJarMods(const QList<JarmodPtr>& jarMods)
+void MinecraftProfile::applyJarMods(const QList<LibraryPtr>& jarMods)
 {
 	this->m_jarMods.append(jarMods);
 }
@@ -593,7 +581,7 @@ QString MinecraftProfile::getMinecraftArguments() const
 	return m_minecraftArguments;
 }
 
-const QList<JarmodPtr> & MinecraftProfile::getJarMods() const
+const QList<LibraryPtr> & MinecraftProfile::getJarMods() const
 {
 	return m_jarMods;
 }
diff --git a/api/logic/minecraft/MinecraftProfile.h b/api/logic/minecraft/MinecraftProfile.h
index 93a02197..6e72afa1 100644
--- a/api/logic/minecraft/MinecraftProfile.h
+++ b/api/logic/minecraft/MinecraftProfile.h
@@ -23,7 +23,6 @@
 
 #include "Library.h"
 #include "ProfilePatch.h"
-#include "JarMod.h"
 #include "BaseVersion.h"
 #include "MojangDownloadInfo.h"
 
@@ -99,11 +98,10 @@ public: /* application of profile variables from patches */
 	void applyMinecraftAssets(MojangAssetIndexInfo::Ptr assets);
 	void applyTraits(const QSet<QString> &traits);
 	void applyTweakers(const QStringList &tweakers);
-	void applyJarMods(const QList<JarmodPtr> &jarMods);
+	void applyJarMods(const QList<LibraryPtr> &jarMods);
 	void applyLibrary(LibraryPtr library);
 	void applyMainJar(LibraryPtr jar);
 	void applyProblemSeverity(ProblemSeverity severity);
-	void applyMojangDownload(const QString & key, MojangDownloadInfo::Ptr download);
 
 public: /* getters for profile variables */
 	QString getMinecraftVersion() const;
@@ -114,7 +112,7 @@ public: /* getters for profile variables */
 	QString getMinecraftArguments() const;
 	const QSet<QString> & getTraits() const;
 	const QStringList & getTweakers() const;
-	const QList<JarmodPtr> & getJarMods() const;
+	const QList<LibraryPtr> & getJarMods() const;
 	const QList<LibraryPtr> & getLibraries() const;
 	const QList<LibraryPtr> & getNativeLibraries() const;
 	const LibraryPtr getMainJar() const;
@@ -149,9 +147,6 @@ private: /* data */
 	/// Assets type - "legacy" or a version ID
 	MojangAssetIndexInfo::Ptr m_minecraftAssets;
 
-	// Mojang: list of 'downloads' - client jar, server jar, windows server exe, maybe more.
-	QMap <QString, std::shared_ptr<MojangDownloadInfo>> mojangDownloads;
-
 	/**
 	 * arguments that should be used for launching minecraft
 	 *
@@ -182,7 +177,7 @@ private: /* data */
 	QSet<QString> m_traits;
 
 	/// A list of jar mods. version files can add those.
-	QList<JarmodPtr> m_jarMods;
+	QList<LibraryPtr> m_jarMods;
 
 	ProblemSeverity m_problemSeverity = ProblemSeverity::None;
 
diff --git a/api/logic/minecraft/ProfilePatch.h b/api/logic/minecraft/ProfilePatch.h
index fb6b2f05..4e72f9cf 100644
--- a/api/logic/minecraft/ProfilePatch.h
+++ b/api/logic/minecraft/ProfilePatch.h
@@ -4,7 +4,6 @@
 #include <QList>
 #include <QJsonDocument>
 #include <QDateTime>
-#include "JarMod.h"
 #include "ProblemProvider.h"
 
 class MinecraftProfile;
diff --git a/api/logic/minecraft/VersionFile.cpp b/api/logic/minecraft/VersionFile.cpp
index 3e1461ed..b6e2ab37 100644
--- a/api/logic/minecraft/VersionFile.cpp
+++ b/api/logic/minecraft/VersionFile.cpp
@@ -6,7 +6,6 @@
 #include "minecraft/VersionFile.h"
 #include "minecraft/Library.h"
 #include "minecraft/MinecraftProfile.h"
-#include "minecraft/JarMod.h"
 #include "ParseUtils.h"
 
 #include "VersionBuildError.h"
@@ -43,12 +42,6 @@ void VersionFile::applyTo(MinecraftProfile *profile)
 		profile->applyLibrary(library);
 	}
 	profile->applyProblemSeverity(getProblemSeverity());
-	auto iter = mojangDownloads.begin();
-	while(iter != mojangDownloads.end())
-	{
-		profile->applyMojangDownload(iter.key(), iter.value());
-		iter++;
-	}
 }
 
 /*
diff --git a/api/logic/minecraft/VersionFile.h b/api/logic/minecraft/VersionFile.h
index 830e2ca0..b673811c 100644
--- a/api/logic/minecraft/VersionFile.h
+++ b/api/logic/minecraft/VersionFile.h
@@ -10,7 +10,6 @@
 #include "minecraft/Rule.h"
 #include "ProblemProvider.h"
 #include "Library.h"
-#include "JarMod.h"
 
 class MinecraftProfile;
 class VersionFile;
@@ -84,7 +83,7 @@ public: /* data */
 	QSet<QString> traits;
 
 	/// MultiMC: list of jar mods added to this version
-	QList<JarmodPtr> jarMods;
+	QList<LibraryPtr> jarMods;
 
 public:
 	// Mojang: DEPRECATED list of 'downloads' - client jar, server jar, windows server exe, maybe more.
diff --git a/api/logic/minecraft/onesix/OneSixInstance.cpp b/api/logic/minecraft/onesix/OneSixInstance.cpp
index 0061be08..7e4e97b7 100644
--- a/api/logic/minecraft/onesix/OneSixInstance.cpp
+++ b/api/logic/minecraft/onesix/OneSixInstance.cpp
@@ -314,7 +314,16 @@ QStringList OneSixInstance::verboseDescription(AuthSessionPtr session)
 		out << "Jar Mods:";
 		for(auto & jarmod: jarMods)
 		{
-			out << "  " + jarmod->originalName + " (" + jarmod->name + ")";
+			auto displayname = jarmod->displayName(currentSystem);
+			auto realname = jarmod->filename(currentSystem);
+			if(displayname != realname)
+			{
+				out << "  " + displayname + " (" + realname + ")";
+			}
+			else
+			{
+				out << "  " + realname;
+			}
 		}
 		out << "";
 	}
@@ -521,8 +530,10 @@ 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)));
+		QStringList jar, temp1, temp2, temp3;
+		jarmod->getApplicableFiles(currentSystem, jar, temp1, temp2, temp3, jarmodsPath().absolutePath());
+		// QString filePath = jarmodsPath().absoluteFilePath(jarmod->filename(currentSystem));
+		mods.push_back(Mod(QFileInfo(jar[0])));
 	}
 	return mods;
 }
diff --git a/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp b/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp
index d3e137c7..b4be3356 100644
--- a/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp
+++ b/api/logic/minecraft/onesix/OneSixProfileStrategy.cpp
@@ -248,16 +248,22 @@ bool OneSixProfileStrategy::removePatch(ProfilePatchPtr patch)
 		m_instance->setComponentVersion(patch->getID(), QString());
 	}
 
-	auto preRemoveJarMod = [&](JarmodPtr jarMod) -> bool
+	// FIXME: we need a generic way of removing local resources, not just jar mods...
+	auto preRemoveJarMod = [&](LibraryPtr jarMod) -> bool
 	{
-		QString fullpath = FS::PathCombine(m_instance->jarModsDir(), jarMod->name);
-		QFileInfo finfo (fullpath);
+		if (!jarMod->isLocal())
+		{
+			return true;
+		}
+		QStringList jar, temp1, temp2, temp3;
+		jarMod->getApplicableFiles(currentSystem, jar, temp1, temp2, temp3, m_instance->jarmodsPath().absolutePath());
+		QFileInfo finfo (jar[0]);
 		if(finfo.exists())
 		{
-			QFile jarModFile(fullpath);
+			QFile jarModFile(jar[0]);
 			if(!jarModFile.remove())
 			{
-				qCritical() << "File" << fullpath << "could not be removed because:" << jarModFile.errorString();
+				qCritical() << "File" << jar[0] << "could not be removed because:" << jarModFile.errorString();
 				return false;
 			}
 			return true;
@@ -381,9 +387,11 @@ bool OneSixProfileStrategy::installJarMods(QStringList filepaths)
 		}
 
 		auto f = std::make_shared<VersionFile>();
-		auto jarMod = std::make_shared<Jarmod>();
-		jarMod->name = target_filename;
-		jarMod->originalName = sourceInfo.completeBaseName();
+		auto jarMod = std::make_shared<Library>();
+		jarMod->setRawName(GradleSpecifier("org.multimc.jarmods:" + id + ":1"));
+		jarMod->setFilename(target_filename);
+		jarMod->setDisplayName(sourceInfo.completeBaseName());
+		jarMod->setHint("local");
 		f->jarMods.append(jarMod);
 		f->name = target_name;
 		f->uid = target_id;
diff --git a/api/logic/minecraft/onesix/OneSixVersionFormat.cpp b/api/logic/minecraft/onesix/OneSixVersionFormat.cpp
index c404e96f..da55d91b 100644
--- a/api/logic/minecraft/onesix/OneSixVersionFormat.cpp
+++ b/api/logic/minecraft/onesix/OneSixVersionFormat.cpp
@@ -20,6 +20,8 @@ LibraryPtr OneSixVersionFormat::libraryFromJson(const QJsonObject &libObj, const
 	readString(libObj, "MMC-hint", out->m_hint);
 	readString(libObj, "MMC-absulute_url", out->m_absoluteURL);
 	readString(libObj, "MMC-absoluteUrl", out->m_absoluteURL);
+	readString(libObj, "MMC-filename", out->m_filename);
+	readString(libObj, "MMC-displayname", out->m_displayname);
 	return out;
 }
 
@@ -30,6 +32,10 @@ QJsonObject OneSixVersionFormat::libraryToJson(Library *library)
 		libRoot.insert("MMC-absoluteUrl", library->m_absoluteURL);
 	if (library->m_hint.size())
 		libRoot.insert("MMC-hint", library->m_hint);
+	if (library->m_filename.size())
+		libRoot.insert("MMC-filename", library->m_filename);
+	if (library->m_displayname.size())
+		libRoot.insert("MMC-displayname", library->m_displayname);
 	return libRoot;
 }
 
@@ -96,13 +102,25 @@ VersionFilePtr OneSixVersionFormat::versionFileFromJson(const QJsonDocument &doc
 		}
 	}
 
-	if (root.contains("+jarMods"))
+
+	if (root.contains("jarMods"))
+	{
+		for (auto libVal : requireArray(root.value("jarMods")))
+		{
+			QJsonObject libObj = requireObject(libVal);
+			// parse the jarmod
+			auto lib = OneSixVersionFormat::jarModFromJson(libObj, filename);
+			// and add to jar mods
+			out->jarMods.append(lib);
+		}
+	}
+	else if (root.contains("+jarMods")) // DEPRECATED: old style '+jarMods' are only here for backwards compatibility
 	{
 		for (auto libVal : requireArray(root.value("+jarMods")))
 		{
 			QJsonObject libObj = requireObject(libVal);
 			// parse the jarmod
-			auto lib = OneSixVersionFormat::jarModFromJson(libObj, filename, out->name);
+			auto lib = OneSixVersionFormat::plusJarModFromJson(libObj, filename, out->name);
 			// and add to jar mods
 			out->jarMods.append(lib);
 		}
@@ -197,13 +215,16 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch
 	writeString(root, "name", patch->name);
 
 	writeString(root, "uid", patch->uid);
-	writeString(root, "fileId", patch->uid);
 
 	writeString(root, "version", patch->version);
 	writeString(root, "mcVersion", patch->dependsOnMinecraftVersion);
 
 	MojangVersionFormat::writeVersionProperties(patch.get(), root);
 
+	if(patch->mainJar)
+	{
+		root.insert("mainJar", libraryToJson(patch->mainJar.get()));
+	}
 	writeString(root, "appletClass", patch->appletClass);
 	writeStringList(root, "+tweakers", patch->addTweakers);
 	writeStringList(root, "+traits", patch->traits.toList());
@@ -214,7 +235,7 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch
 		{
 			array.append(OneSixVersionFormat::libraryToJson(value.get()));
 		}
-		root.insert("+libraries", array);
+		root.insert("libraries", array);
 	}
 	if (!patch->jarMods.isEmpty())
 	{
@@ -223,7 +244,7 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch
 		{
 			array.append(OneSixVersionFormat::jarModtoJson(value.get()));
 		}
-		root.insert("+jarMods", array);
+		root.insert("jarMods", array);
 	}
 	// write the contents to a json document.
 	{
@@ -233,32 +254,55 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch
 	}
 }
 
-JarmodPtr OneSixVersionFormat::jarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName)
+LibraryPtr OneSixVersionFormat::plusJarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName)
 {
-	JarmodPtr out(new Jarmod());
+	LibraryPtr out(new Library());
 	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();
-	if(out->originalName.isEmpty())
+
+	// just make up something unique on the spot for the library name.
+	auto uuid = QUuid::createUuid();
+	QString id = uuid.toString().remove('{').remove('}');
+
+
+	// filename override is the old name
+	out->setFilename(libObj.value("name").toString());
+
+	// it needs to be local, it is stored in the instance jarmods folder
+	out->setHint("local");
+
+	// read the original name if present - some versions did not set it
+	// it is the original jar mod filename before it got renamed at the point of addition
+	auto displayName = libObj.value("originalName").toString();
+	if(displayName.isEmpty())
 	{
 		auto fixed = originalName;
 		fixed.remove(" (jar mod)");
-		out->originalName = originalName;
+		out->setDisplayName(fixed);
+	}
+	else
+	{
+		out->setDisplayName(displayName);
 	}
 	return out;
 }
 
-QJsonObject OneSixVersionFormat::jarModtoJson(Jarmod *jarmod)
+LibraryPtr OneSixVersionFormat::jarModFromJson(const QJsonObject& libObj, const QString& filename)
+{
+	auto lib = libraryFromJson(libObj, filename);
+	return lib;
+}
+
+
+QJsonObject OneSixVersionFormat::jarModtoJson(Library *jarmod)
 {
-	QJsonObject out;
-	writeString(out, "name", jarmod->name);
-	if(!jarmod->originalName.isEmpty())
+	QJsonObject out = libraryToJson(jarmod);
+	if(!jarmod->m_displayname.isEmpty())
 	{
-		writeString(out, "originalName", jarmod->originalName);
+		writeString(out, "originalName", jarmod->m_displayname);
 	}
 	return out;
 }
diff --git a/api/logic/minecraft/onesix/OneSixVersionFormat.h b/api/logic/minecraft/onesix/OneSixVersionFormat.h
index 5696e79e..0a29a202 100644
--- a/api/logic/minecraft/onesix/OneSixVersionFormat.h
+++ b/api/logic/minecraft/onesix/OneSixVersionFormat.h
@@ -16,7 +16,10 @@ public:
 	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);
+	// DEPRECATED: old 'plus' jar mods generated by the application
+	static LibraryPtr plusJarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName);
+
+	// new jar mods derived from libraries
+	static LibraryPtr jarModFromJson(const QJsonObject &libObj, const QString &filename);
+	static QJsonObject jarModtoJson(Library * jarmod);
 };
diff --git a/api/logic/minecraft/onesix/update/LibrariesTask.cpp b/api/logic/minecraft/onesix/update/LibrariesTask.cpp
index 1b7e71d3..2cd41ded 100644
--- a/api/logic/minecraft/onesix/update/LibrariesTask.cpp
+++ b/api/logic/minecraft/onesix/update/LibrariesTask.cpp
@@ -50,6 +50,7 @@ void LibrariesTask::executeTask()
 	};
 	createJobs(profile->getLibraries());
 	createJobs(profile->getNativeLibraries());
+	createJobs(profile->getJarMods());
 	createJob(profile->getMainJar());
 
 	// FIXME: this is never filled!!!!