Implement plugin patcher (#63)

arclight-common/src/main/java/io/izzel/arclight/common/mod/util/remapper/ArclightRemapper.java

@@ -4,6 +4,7 @@ import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
 import io.izzel.arclight.api.Unsafe;
 import io.izzel.arclight.common.mod.util.log.ArclightI18nLogger;
+import io.izzel.arclight.common.mod.util.remapper.patcher.ArclightPluginPatcher;
 import net.md_5.specialsource.InheritanceMap;
 import net.md_5.specialsource.JarMapping;
 import net.md_5.specialsource.provider.ClassLoaderProvider;
@@ -56,6 +57,7 @@ public class ArclightRemapper {
         this.transformerList.add(ArclightInterfaceInvokerGen.INSTANCE);
         this.transformerList.add(ArclightRedirectAdapter.INSTANCE);
         this.transformerList.add(ClassLoaderAdapter.INSTANCE);
+        ArclightPluginPatcher.load(this.transformerList);
     }
 
     public static ClassLoaderRemapper createClassLoaderRemapper(ClassLoader classLoader) {

arclight-common/src/main/java/io/izzel/arclight/common/mod/util/remapper/PluginTransformer.java

@@ -5,4 +5,8 @@ import org.objectweb.asm.tree.ClassNode;
 public interface PluginTransformer {
 
     void handleClass(ClassNode node, ClassLoaderRemapper remapper);
+
+    default int priority() {
+        return 0;
+    }
 }

arclight-common/src/main/java/io/izzel/arclight/common/mod/util/remapper/patcher/ArclightPluginPatcher.java

@@ -0,0 +1,73 @@
+package io.izzel.arclight.common.mod.util.remapper.patcher;
+
+import io.izzel.arclight.common.mod.ArclightMod;
+import io.izzel.arclight.common.mod.util.remapper.ClassLoaderRemapper;
+import io.izzel.arclight.common.mod.util.remapper.PluginTransformer;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.objectweb.asm.tree.ClassNode;
+
+import java.io.File;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Optional;
+
+public class ArclightPluginPatcher implements PluginTransformer {
+
+    private final List<PluginTransformer> list;
+
+    public ArclightPluginPatcher(List<PluginTransformer> list) {
+        this.list = list;
+    }
+
+    @Override
+    public void handleClass(ClassNode node, ClassLoaderRemapper remapper) {
+        for (PluginTransformer transformer : list) {
+            transformer.handleClass(node, remapper);
+        }
+    }
+
+    public static void load(List<PluginTransformer> transformerList) {
+        File pluginFolder = new File("plugins");
+        if (pluginFolder.exists()) {
+            ArclightMod.LOGGER.info("patcher.loading");
+            ArrayList<PluginTransformer> list = new ArrayList<>();
+            for (File file : pluginFolder.listFiles()) {
+                if (file.isFile() && file.getName().endsWith(".jar")) {
+                    loadFromJar(file.toPath()).ifPresent(list::add);
+                }
+            }
+            if (!list.isEmpty()) {
+                list.sort(Comparator.comparing(PluginTransformer::priority));
+                ArclightMod.LOGGER.info("patcher.loaded", list.size());
+                transformerList.add(new ArclightPluginPatcher(list));
+            }
+        }
+    }
+
+    private static Optional<PluginTransformer> loadFromJar(Path path) {
+        try {
+            FileSystem fileSystem = FileSystems.newFileSystem(path, ArclightPluginPatcher.class.getClassLoader());
+            Path pluginYml = fileSystem.getPath("plugin.yml");
+            if (Files.exists(pluginYml)) {
+                YamlConfiguration configuration = YamlConfiguration.loadConfiguration(Files.newBufferedReader(pluginYml));
+                String name = configuration.getString("arclight.patcher");
+                if (name != null) {
+                    URLClassLoader loader = new URLClassLoader(new URL[]{path.toUri().toURL()}, ArclightPluginPatcher.class.getClassLoader());
+                    Class<?> clazz = Class.forName(name, false, loader);
+                    PluginTransformer transformer = clazz.asSubclass(PluginTransformer.class).newInstance();
+                    return Optional.of(transformer);
+                }
+            }
+        } catch (Exception e) {
+            ArclightMod.LOGGER.error("patcher.load-error", e);
+        }
+        return Optional.empty();
+    }
+}

i18n-config/src/main/resources/META-INF/i18n/en_us.conf

@@ -40,6 +40,11 @@ mixin-load {
   optimization = "Arclight optimization mixin added."
 }
 mod-load = "Arclight Mod loaded."
+patcher {
+  loading = "Loading plugin patchers ..."
+  loaded = "Loaded {} patchers"
+  load-error = "Error occurred while loading patcher"
+}
 registry {
   forge-event = "Arclight events registered."
   begin = "Regitring for Bukkit ..."

i18n-config/src/main/resources/META-INF/i18n/zh_cn.conf

@@ -44,6 +44,11 @@ mixin-load {
   optimization = "服务端优化 Mixin 配置已加载"
 }
 mod-load = "Arclight Mod 已加载"
+patcher {
+  loading = "正在加载 Plugin Patcher ..."
+  loaded = "加载了 {} 个 Patcher"
+  load-error = "加载 Patcher 时发生错误"
+}
 registry {
   forge-event = "Arclight 事件系统已注册"
   begin = "正在向 Bukkit 注册 ..."