fabric-loom/src/main/java/net/fabricmc/loom/util/ModProcessor.java

/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016, 2017, 2018 FabricMC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package net.fabricmc.loom.util;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import net.fabricmc.loom.LoomGradleExtension;
import net.fabricmc.loom.providers.MappingsProvider;
import net.fabricmc.loom.providers.MinecraftMappedProvider;
import net.fabricmc.loom.providers.MinecraftProvider;
import net.fabricmc.tinyremapper.OutputConsumerPath;
import net.fabricmc.tinyremapper.TinyRemapper;
import net.fabricmc.tinyremapper.TinyUtils;
import org.apache.commons.io.IOUtils;
import org.gradle.api.Project;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.artifacts.ExternalModuleDependency;
import org.gradle.api.artifacts.repositories.MavenArtifactRepository;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collection;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

public class ModProcessor {
	private static final Gson GSON = new Gson();

	public static void handleMod(File input, File output, Project project){
		if(output.exists()){
			output.delete();
		}
		remapJar(input, output, project);
		readInstallerJson(input, project);
	}

	private static void remapJar(File input, File output, Project project){
		LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
		String fromM = "intermediary";
		String toM = "named";

		MinecraftMappedProvider mappedProvider = extension.getMinecraftMappedProvider();
		MappingsProvider mappingsProvider = extension.getMappingsProvider();

		File mappingsFile = mappingsProvider.MAPPINGS_TINY;
		Path mappings = mappingsFile.toPath();
		Path inputPath = input.getAbsoluteFile().toPath();
		Path mc = mappedProvider.MINECRAFT_INTERMEDIARY_JAR.toPath();
		Path[] mcDeps = mappedProvider.getMapperPaths().stream()
			.map(File::toPath)
			.toArray(Path[]::new);
		Collection<File> modCompileFiles = project.getConfigurations().getByName(Constants.COMPILE_MODS).getFiles();
		Path[] modCompiles = modCompileFiles.stream()
				.map(p -> {
					if (p.equals(input)) {
						return inputPath;
					} else {
						return p.toPath();
					}
				})
				.toArray(Path[]::new);

		project.getLogger().lifecycle(":remapping " + input.getName() + " (TinyRemapper, " + fromM + " -> " + toM + ")");

		TinyRemapper remapper = TinyRemapper.newRemapper()
			.withMappings(TinyUtils.createTinyMappingProvider(mappings, fromM, toM))
			.build();

		try (OutputConsumerPath outputConsumer = new OutputConsumerPath(Paths.get(output.getAbsolutePath()))) {
			outputConsumer.addNonClassFiles(inputPath);
			if (!modCompileFiles.contains(input)) {
				remapper.read(inputPath);
			}
			remapper.read(modCompiles);
			remapper.read(mc);
			remapper.read(mcDeps);
			remapper.apply(inputPath, outputConsumer);
		} catch (Exception e){
			throw new RuntimeException("Failed to remap JAR to " + toM, e);
		} finally {
			remapper.finish();
		}

		if(!output.exists()){
			throw new RuntimeException("Failed to remap JAR to " + toM + " file not found: " + output.getAbsolutePath());
		}

		if (MixinRefmapHelper.transformRefmaps(remapper, output)) {
			project.getLogger().lifecycle(":remapping " + input.getName() + " (Mixin reference maps)");
			remapper.finish();
		}
	}

	private static void readInstallerJson(File file, Project project){
		try {
			JarFile jarFile = new JarFile(file);

			LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
			String launchMethod = extension.getLoaderLaunchMethod();

			int priority = 0;

			ZipEntry entry = null;
			if (!launchMethod.isEmpty()) {
				entry = jarFile.getEntry("fabric-installer." + launchMethod + ".json");
				if (entry == null) {
					project.getLogger().warn("Could not find loader launch method '" + launchMethod + "', falling back");
				}
			}

			if(entry == null){
				entry = jarFile.getEntry("fabric-installer.json");
				priority = 1;
				if (entry == null) {
					jarFile.close();
					return;
				}
			}
			InputStream inputstream = jarFile.getInputStream(entry);
			String jsonStr = IOUtils.toString(inputstream, StandardCharsets.UTF_8);
			inputstream.close();
			jarFile.close();

			JsonObject jsonObject = GSON.fromJson(jsonStr, JsonObject.class);
			extension.setInstallerJson(jsonObject, priority);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}