New hook API

api/src/main/java/io/github/libxposed/api/XposedContextWrapper.java

@@ -87,25 +87,7 @@ public class XposedContextWrapper extends ContextWrapper implements XposedInterf
      */
     @NonNull
     @Override
-    public final MethodUnhooker<BeforeHooker<Method>, Method> hookBefore(@NonNull Method origin, @NonNull BeforeHooker<Method> hooker) {
+    public final MethodUnhooker<Method> hook(@NonNull Method origin, @NonNull Class<? extends Hooker> hooker) {
-        return getBaseContext().hookBefore(origin, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final MethodUnhooker<AfterHooker<Method>, Method> hookAfter(@NonNull Method origin, @NonNull AfterHooker<Method> hooker) {
-        return getBaseContext().hookAfter(origin, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final MethodUnhooker<Hooker<Method>, Method> hook(@NonNull Method origin, @NonNull Hooker<Method> hooker) {
         return getBaseContext().hook(origin, hooker);
     }
 
@@ -114,25 +96,7 @@ public class XposedContextWrapper extends ContextWrapper implements XposedInterf
      */
     @NonNull
     @Override
-    public final MethodUnhooker<BeforeHooker<Method>, Method> hookBefore(@NonNull Method origin, int priority, @NonNull BeforeHooker<Method> hooker) {
+    public final MethodUnhooker<Method> hook(@NonNull Method origin, int priority, @NonNull Class<? extends Hooker> hooker) {
-        return getBaseContext().hookBefore(origin, priority, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final MethodUnhooker<AfterHooker<Method>, Method> hookAfter(@NonNull Method origin, int priority, @NonNull AfterHooker<Method> hooker) {
-        return getBaseContext().hookAfter(origin, priority, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final MethodUnhooker<Hooker<Method>, Method> hook(@NonNull Method origin, int priority, @NonNull Hooker<Method> hooker) {
         return getBaseContext().hook(origin, priority, hooker);
     }
 
@@ -141,25 +105,7 @@ public class XposedContextWrapper extends ContextWrapper implements XposedInterf
      */
     @NonNull
     @Override
-    public final <T> MethodUnhooker<BeforeHooker<Constructor<T>>, Constructor<T>> hookBefore(@NonNull Constructor<T> origin, @NonNull BeforeHooker<Constructor<T>> hooker) {
+    public final <T> MethodUnhooker<Constructor<T>> hook(@NonNull Constructor<T> origin, @NonNull Class<? extends Hooker> hooker) {
-        return getBaseContext().hookBefore(origin, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final <T> MethodUnhooker<AfterHooker<Constructor<T>>, Constructor<T>> hookAfter(@NonNull Constructor<T> origin, @NonNull AfterHooker<Constructor<T>> hooker) {
-        return getBaseContext().hookAfter(origin, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final <T> MethodUnhooker<Hooker<Constructor<T>>, Constructor<T>> hook(@NonNull Constructor<T> origin, @NonNull Hooker<Constructor<T>> hooker) {
         return getBaseContext().hook(origin, hooker);
     }
 
@@ -168,25 +114,7 @@ public class XposedContextWrapper extends ContextWrapper implements XposedInterf
      */
     @NonNull
     @Override
-    public final <T> MethodUnhooker<BeforeHooker<Constructor<T>>, Constructor<T>> hookBefore(@NonNull Constructor<T> origin, int priority, @NonNull BeforeHooker<Constructor<T>> hooker) {
+    public final <T> MethodUnhooker<Constructor<T>> hook(@NonNull Constructor<T> origin, int priority, @NonNull Class<? extends Hooker> hooker) {
-        return getBaseContext().hookBefore(origin, priority, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final <T> MethodUnhooker<AfterHooker<Constructor<T>>, Constructor<T>> hookAfter(@NonNull Constructor<T> origin, int priority, @NonNull AfterHooker<Constructor<T>> hooker) {
-        return getBaseContext().hookAfter(origin, priority, hooker);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @NonNull
-    @Override
-    public final <T> MethodUnhooker<Hooker<Constructor<T>>, Constructor<T>> hook(@NonNull Constructor<T> origin, int priority, @NonNull Hooker<Constructor<T>> hooker) {
         return getBaseContext().hook(origin, priority, hooker);
     }
 

api/src/main/java/io/github/libxposed/api/XposedInterface.java

@@ -13,10 +13,13 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Member;
 import java.lang.reflect.Method;
 import java.nio.ByteBuffer;
-import java.util.ConcurrentModificationException;
 
+import io.github.libxposed.api.annotations.AfterInvocation;
+import io.github.libxposed.api.annotations.BeforeInvocation;
+import io.github.libxposed.api.annotations.XposedHooker;
 import io.github.libxposed.api.errors.HookFailedError;
 import io.github.libxposed.api.utils.DexParser;
 
@@ -62,239 +65,70 @@ public interface XposedInterface {
     int PRIORITY_HIGHEST = 10000;
 
     /**
-     * The interface Before hook callback.
+     * Interface for method / constructor hooking. Xposed modules should define their own hooker class
+     * and implement this interface. Normally, there could be one global hooker class for all method
+     * hooking.
      *
-     * @param <T> the type parameter
+     * <p>
+     * Classes implementing this interface should be annotated with {@link XposedHooker} and should provide
+     * two public static methods that are annotated with {@link BeforeInvocation} and {@link AfterInvocation},
+     * respectively.
+     * </p>
+     *
+     * <p>
+     * The before invocation method should have the following signature:<br/>
+     * params: {@code member} - The {@link Member} object representing the method or constructor being hooked<br/>
+     * &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+     *         {@code thisObject} - The {@code this} pointer, or null if the method is static<br/>
+     * &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+     *         {@code args} - The arguments used for the method call<br/>
+     * returns: An {@link Hooker} object, used to save contextual information for current invocation routine
+     * </p>
+     *
+     * <p>
+     * The after invocation method should have the following signature:<br/>
+     * params: {@code extras} - The {@link Hooker} object returned by the before invocation method<br/>
+     * &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+     *         {@code result} - The result of the invocation
+     * </p>
+     *
+     * <p>Example usage:</p>
+     *
+     * <pre>{@code
+     *   @XposedHooker
+     *   public class ExampleHooker implements XposedInterface.Hooker {
+     *
+     *       @BeforeInvocation
+     *       public static @Nullable XposedInterface.Hooker
+     *       before(@NonNull Member member, @Nullable Object thisObject, @NonNull Object[] args) {
+     *           // Pre-hooking logic goes here
+     *       }
+     *
+     *       @AfterInvocation
+     *       public static void
+     *       after(@Nullable XposedInterface.Hooker extras, @Nullable Object result) {
+     *           // Post-hooking logic goes here
+     *       }
+     *   }
+     * }</pre>
      */
-    interface BeforeHookCallback<T> {
+    interface Hooker {
+    }
+
     /**
-         * Gets origin.
+     * Interface for canceling a hook.
      *
-         * @return the origin
+     * @param <T> {@link Method} or {@link Constructor}
+     */
+    interface MethodUnhooker<T> {
+        /**
+         * Gets the method or constructor being hooked.
          */
         @NonNull
         T getOrigin();
 
         /**
-         * Gets this.
+         * Cancels the hook. The behavior of calling this method multiple times is undefined.
-         *
-         * @return the this
-         */
-        @Nullable
-        Object getThis();
-
-        /**
-         * Get args object [ ].
-         *
-         * @return the object [ ]
-         */
-        @NonNull
-        Object[] getArgs();
-
-        /**
-         * Gets arg.
-         *
-         * @param <U>   the type parameter
-         * @param index the index
-         * @return the arg
-         */
-        @Nullable
-        <U> U getArg(int index);
-
-        /**
-         * Sets arg.
-         *
-         * @param <U>   the type parameter
-         * @param index the index
-         * @param value the value
-         */
-        <U> void setArg(int index, U value);
-
-        /**
-         * Return and skip.
-         *
-         * @param returnValue the return value
-         */
-        void returnAndSkip(@Nullable Object returnValue);
-
-        /**
-         * Throw and skip.
-         *
-         * @param throwable the throwable
-         */
-        void throwAndSkip(@Nullable Throwable throwable);
-
-        /**
-         * Invoke origin object.
-         *
-         * @return the object
-         * @throws InvocationTargetException the invocation target exception
-         * @throws IllegalArgumentException  the illegal argument exception
-         * @throws IllegalAccessException    the illegal access exception
-         */
-        @Nullable
-        Object invokeOrigin() throws InvocationTargetException, IllegalArgumentException, IllegalAccessException;
-
-        /**
-         * Sets extra.
-         *
-         * @param <U>   the type parameter
-         * @param key   the key
-         * @param value the value
-         * @throws ConcurrentModificationException the concurrent modification exception
-         */
-        <U> void setExtra(@NonNull String key, @Nullable U value) throws ConcurrentModificationException;
-    }
-
-    /**
-     * The interface After hook callback.
-     *
-     * @param <T> the type parameter
-     */
-    interface AfterHookCallback<T> {
-        /**
-         * Gets origin.
-         *
-         * @return the origin
-         */
-        @NonNull
-        T getOrigin();
-
-        /**
-         * Gets this.
-         *
-         * @return the this
-         */
-        @Nullable
-        Object getThis();
-
-        /**
-         * Get args object [ ].
-         *
-         * @return the object [ ]
-         */
-        @NonNull
-        Object[] getArgs();
-
-        /**
-         * Gets result.
-         *
-         * @return the result
-         */
-        @Nullable
-        Object getResult();
-
-        /**
-         * Gets throwable.
-         *
-         * @return the throwable
-         */
-        @Nullable
-        Throwable getThrowable();
-
-        /**
-         * Is skipped boolean.
-         *
-         * @return the boolean
-         */
-        boolean isSkipped();
-
-        /**
-         * Sets result.
-         *
-         * @param result the result
-         */
-        void setResult(@Nullable Object result);
-
-        /**
-         * Sets throwable.
-         *
-         * @param throwable the throwable
-         */
-        void setThrowable(@Nullable Throwable throwable);
-
-        /**
-         * Invoke origin object.
-         *
-         * @return the object
-         * @throws InvocationTargetException the invocation target exception
-         * @throws IllegalAccessException    the illegal access exception
-         */
-        @Nullable
-        Object invokeOrigin() throws InvocationTargetException, IllegalAccessException;
-
-        /**
-         * Gets extra.
-         *
-         * @param <U> the type parameter
-         * @param key the key
-         * @return the extra
-         */
-        @Nullable
-        <U> U getExtra(@NonNull String key);
-    }
-
-    /**
-     * The interface Before hooker.
-     *
-     * @param <T> the type parameter
-     */
-    interface BeforeHooker<T> {
-        /**
-         * Before.
-         *
-         * @param callback the callback
-         */
-        void before(@NonNull BeforeHookCallback<T> callback);
-    }
-
-    /**
-     * The interface After hooker.
-     *
-     * @param <T> the type parameter
-     */
-    interface AfterHooker<T> {
-        /**
-         * After.
-         *
-         * @param callback the callback
-         */
-        void after(@NonNull AfterHookCallback<T> callback);
-    }
-
-    /**
-     * The interface Hooker.
-     *
-     * @param <T> the type parameter
-     */
-    interface Hooker<T> extends BeforeHooker<T>, AfterHooker<T> {
-    }
-
-    /**
-     * The interface Method unhooker.
-     *
-     * @param <T> the type parameter
-     * @param <U> the type parameter
-     */
-    interface MethodUnhooker<T, U> {
-        /**
-         * Gets origin.
-         *
-         * @return the origin
-         */
-        @NonNull
-        U getOrigin();
-
-        /**
-         * Gets hooker.
-         *
-         * @return the hooker
-         */
-        @NonNull
-        T getHooker();
-
-        /**
-         * Unhook.
          */
         void unhook();
     }
@@ -329,30 +163,6 @@ public interface XposedInterface {
      */
     int getFrameworkPrivilege();
 
-    /**
-     * Hook before method unhooker.
-     *
-     * @param origin the origin
-     * @param hooker the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    MethodUnhooker<BeforeHooker<Method>, Method> hookBefore(@NonNull Method origin, @NonNull BeforeHooker<Method> hooker);
-
-    /**
-     * Hook after method unhooker.
-     *
-     * @param origin the origin
-     * @param hooker the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    MethodUnhooker<AfterHooker<Method>, Method> hookAfter(@NonNull Method origin, @NonNull AfterHooker<Method> hooker);
-
     /**
      * Hook method unhooker.
      *
@@ -363,33 +173,7 @@ public interface XposedInterface {
      * @throws HookFailedError          if hook fails due to framework internal error
      */
     @NonNull
-    MethodUnhooker<Hooker<Method>, Method> hook(@NonNull Method origin, @NonNull Hooker<Method> hooker);
+    MethodUnhooker<Method> hook(@NonNull Method origin, @NonNull Class<? extends Hooker> hooker);
-
-    /**
-     * Hook before method unhooker.
-     *
-     * @param origin   the origin
-     * @param priority the priority
-     * @param hooker   the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    MethodUnhooker<BeforeHooker<Method>, Method> hookBefore(@NonNull Method origin, int priority, @NonNull BeforeHooker<Method> hooker);
-
-    /**
-     * Hook after method unhooker.
-     *
-     * @param origin   the origin
-     * @param priority the priority
-     * @param hooker   the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    MethodUnhooker<AfterHooker<Method>, Method> hookAfter(@NonNull Method origin, int priority, @NonNull AfterHooker<Method> hooker);
 
     /**
      * Hook method unhooker.
@@ -402,33 +186,7 @@ public interface XposedInterface {
      * @throws HookFailedError          if hook fails due to framework internal error
      */
     @NonNull
-    MethodUnhooker<Hooker<Method>, Method> hook(@NonNull Method origin, int priority, @NonNull Hooker<Method> hooker);
+    MethodUnhooker<Method> hook(@NonNull Method origin, int priority, @NonNull Class<? extends Hooker> hooker);
-
-    /**
-     * Hook before method unhooker.
-     *
-     * @param <T>    the type parameter
-     * @param origin the origin
-     * @param hooker the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    <T> MethodUnhooker<BeforeHooker<Constructor<T>>, Constructor<T>> hookBefore(@NonNull Constructor<T> origin, @NonNull BeforeHooker<Constructor<T>> hooker);
-
-    /**
-     * Hook after method unhooker.
-     *
-     * @param <T>    the type parameter
-     * @param origin the origin
-     * @param hooker the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    <T> MethodUnhooker<AfterHooker<Constructor<T>>, Constructor<T>> hookAfter(@NonNull Constructor<T> origin, @NonNull AfterHooker<Constructor<T>> hooker);
 
     /**
      * Hook method unhooker.
@@ -441,35 +199,7 @@ public interface XposedInterface {
      * @throws HookFailedError          if hook fails due to framework internal error
      */
     @NonNull
-    <T> MethodUnhooker<Hooker<Constructor<T>>, Constructor<T>> hook(@NonNull Constructor<T> origin, @NonNull Hooker<Constructor<T>> hooker);
+    <T> MethodUnhooker<Constructor<T>> hook(@NonNull Constructor<T> origin, @NonNull Class<? extends Hooker> hooker);
-
-    /**
-     * Hook before method unhooker.
-     *
-     * @param <T>      the type parameter
-     * @param origin   the origin
-     * @param priority the priority
-     * @param hooker   the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    <T> MethodUnhooker<BeforeHooker<Constructor<T>>, Constructor<T>> hookBefore(@NonNull Constructor<T> origin, int priority, @NonNull BeforeHooker<Constructor<T>> hooker);
-
-    /**
-     * Hook after method unhooker.
-     *
-     * @param <T>      the type parameter
-     * @param origin   the origin
-     * @param priority the priority
-     * @param hooker   the hooker
-     * @return the method unhooker
-     * @throws IllegalArgumentException if origin is abstract, framework internal or {@link Method#invoke}
-     * @throws HookFailedError          if hook fails due to framework internal error
-     */
-    @NonNull
-    <T> MethodUnhooker<AfterHooker<Constructor<T>>, Constructor<T>> hookAfter(@NonNull Constructor<T> origin, int priority, @NonNull AfterHooker<Constructor<T>> hooker);
 
     /**
      * Hook method unhooker.
@@ -483,7 +213,7 @@ public interface XposedInterface {
      * @throws HookFailedError          if hook fails due to framework internal error
      */
     @NonNull
-    <T> MethodUnhooker<Hooker<Constructor<T>>, Constructor<T>> hook(@NonNull Constructor<T> origin, int priority, @NonNull Hooker<Constructor<T>> hooker);
+    <T> MethodUnhooker<Constructor<T>> hook(@NonNull Constructor<T> origin, int priority, @NonNull Class<? extends Hooker> hooker);
 
     /**
      * Deoptimizes a method in case hooked callee is not called because of inline.

api/src/main/java/io/github/libxposed/api/annotations/AfterInvocation.java

@@ -0,0 +1,11 @@
+package io.github.libxposed.api.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface AfterInvocation {
+}

api/src/main/java/io/github/libxposed/api/annotations/BeforeInvocation.java

@@ -0,0 +1,11 @@
+package io.github.libxposed.api.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface BeforeInvocation {
+}

api/src/main/java/io/github/libxposed/api/annotations/XposedHooker.java

@@ -0,0 +1,11 @@
+package io.github.libxposed.api.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface XposedHooker {
+}