Add OptiFine transformer hook

src/main/java/com/falsepattern/lib/internal/asm/FPTransformer.java

@@ -29,6 +29,7 @@ import com.falsepattern.lib.internal.asm.transformers.ConfigOrderTransformer;
 import com.falsepattern.lib.internal.asm.transformers.GasStationValidatorTransformer;
 import com.falsepattern.lib.internal.asm.transformers.IMixinPluginTransformer;
 import com.falsepattern.lib.internal.asm.transformers.ITypeDiscovererTransformer;
+import com.falsepattern.lib.internal.impl.optifine.OptiFineTransformerHooksImpl;
 import lombok.Getter;
 import lombok.experimental.Accessors;
 import org.apache.logging.log4j.LogManager;
@@ -48,6 +49,10 @@ public class FPTransformer implements SmartTransformer {
     @Getter
     private final Logger logger = LOG;
 
+    static {
+        OptiFineTransformerHooksImpl.init();
+    }
+
     public FPTransformer() {
         transformers = Arrays.asList(new IMixinPluginTransformer(),
                                      new ITypeDiscovererTransformer(),

src/main/java/com/falsepattern/lib/internal/impl/optifine/OptiFineTransformerHooksImpl.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2022-2023 FalsePattern
+ * All Rights Reserved
+ *
+ * The above copyright notice and this permission notice
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.falsepattern.lib.internal.impl.optifine;
+
+import com.falsepattern.lib.internal.Share;
+import lombok.val;
+
+import net.minecraft.launchwrapper.IClassTransformer;
+import net.minecraft.launchwrapper.Launch;
+import net.minecraft.launchwrapper.LaunchClassLoader;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class OptiFineTransformerHooksImpl {
+    private static final Set<String> disabledPatches = new HashSet<>();
+    public static void init() {
+        Field tField;
+        try {
+            tField = LaunchClassLoader.class.getDeclaredField("transformers");
+        } catch (NoSuchFieldException e) {
+            Share.LOG.error("Could not retrieve transformers field", e);
+            return;
+        }
+        tField.setAccessible(true);
+        List<IClassTransformer> transformers;
+        try {
+            transformers = (List<IClassTransformer>)tField.get(Launch.classLoader);
+        } catch (IllegalAccessException e) {
+            Share.LOG.error("Could not retrieve transformers list", e);
+            return;
+        }
+        for (int i = 0; i < transformers.size(); i++) {
+            val transformer = transformers.get(i);
+            System.out.println(transformer.getClass().getName());
+            if (transformer.getClass().getName().equals("optifine.OptiFineClassTransformer")) {
+                Share.LOG.info("Attaching OptiFine ASM transformer hooks");
+                transformers.set(i, new WrappedOptiFineClassTransformer(transformer));
+            }
+        }
+    }
+
+    public static void disableOptiFinePatch(String patchName) {
+        disabledPatches.add(patchName);
+    }
+
+    public static boolean isDisabled(String className) {
+        return disabledPatches.contains(className);
+    }
+}

src/main/java/com/falsepattern/lib/internal/impl/optifine/WrappedOptiFineClassTransformer.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2022-2023 FalsePattern
+ * All Rights Reserved
+ *
+ * The above copyright notice and this permission notice
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.falsepattern.lib.internal.impl.optifine;
+
+import lombok.RequiredArgsConstructor;
+
+import net.minecraft.launchwrapper.IClassTransformer;
+
+@RequiredArgsConstructor
+public class WrappedOptiFineClassTransformer implements IClassTransformer {
+    private final IClassTransformer optiFineTransformer;
+    @Override
+    public byte[] transform(String name, String transformedName, byte[] basicClass) {
+        if (OptiFineTransformerHooksImpl.isDisabled(name)) {
+            return basicClass;
+        }
+        return optiFineTransformer.transform(name, transformedName, basicClass);
+    }
+}

src/main/java/com/falsepattern/lib/optifine/OptiFineTransformerHooks.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2022-2023 FalsePattern
+ * All Rights Reserved
+ *
+ * The above copyright notice and this permission notice
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.falsepattern.lib.optifine;
+
+import com.falsepattern.lib.StableAPI;
+import com.falsepattern.lib.internal.impl.optifine.OptiFineTransformerHooksImpl;
+
+/**
+ * A utility for manipulating OptiFine's patches.
+ * If you have a mod that injects code that would otherwise conflict with OptiFine, and you have provably tested that
+ * removing certain OptiFine patches from the jar does NOT break anything, you may use this class to disable them
+ * without having to do jar file edits.
+ */
+@StableAPI(since = "1.0.0")
+public class OptiFineTransformerHooks {
+    @StableAPI.Expose
+    public static void disableOptiFinePatch(String patchName) {
+        OptiFineTransformerHooksImpl.disableOptiFinePatch(patchName);
+    }
+}