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UPDATE: Add support for getter & setter style method in Hack.Mirror<T> interface to mirror member field.

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This commit is contained in:
Oasis 2019-06-26 18:33:29 +08:00
parent 70750acc7c
commit 7df83723ab
1 changed files with 40 additions and 2 deletions
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42
library/src/main/java/com/oasisfeng/hack/Hack.java
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@ -2,6 +2,7 @@ package com.oasisfeng.hack;
import android.util.ArrayMap;
import android.util.Log;
import android.util.Pair;
import com.oasisfeng.android.util.Supplier;
import com.oasisfeng.android.util.Suppliers;
@ -32,6 +33,10 @@ import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import static android.os.Build.VERSION.SDK_INT;
import static android.os.Build.VERSION_CODES.O;
import static java.lang.Character.toLowerCase;
/**
* Java reflection helper optimized for hacking non-public APIs.
* The core design philosophy behind is compile-time consistency enforcement.
@ -60,6 +65,7 @@ public class Hack {
* <pre>
* interface HiddenClass extends Mirror&lt;com.foo.HiddenClass&gt; {
* void foo(int x);
* int getValue(); // Mirror getter for member field "value" (setter can be defined too)
* static int bar(String name) {
* return Hack.mirrorStaticMethod("bar", -1, name);
* }
@ -196,7 +202,8 @@ public class Hack {
for (final Method mirror_method : inner_class.getMethods()) try {
findSourceMethodForMirror(mirror_method, source_class);
} catch (final NoSuchMethodException e) {
fail(new AssertionException(e));
if (extractFieldGetterOrSetterFromMethod(mirror_method, source_class) != null) continue;
fail(new AssertionException(e).setHackedClass(into(inner_class)));
}
verifyAllMirrorsIn(inner_class); // Only Mirror class may contain inner Mirror classes
}
@ -214,7 +221,19 @@ public class Hack {
final Method source_method = findSourceMethodForMirror(mirror_method, source_class); // TODO: Cache
source_method.setAccessible(true);
source_result = source_method.invoke(mSource, args);
} catch (final IllegalAccessException/* should not happen */| NoSuchMethodException e) {
} catch (final NoSuchMethodException e) {
final String mirror_method_name = mirror_method.getName(); final boolean is_getter; final char first_char;
final Pair<Boolean, Field> accessor = extractFieldGetterOrSetterFromMethod(mirror_method, source_class); // TODO: Cache
if (accessor != null) {
final Field field = accessor.second;
field.setAccessible(true);
if (! accessor.first) { // Setter
field.set(mSource, args[0]);
return null;
} else return field.get(mSource);
}
return fallback(mirror_method);
} catch (final IllegalAccessException e) {
return fallback(mirror_method);
} catch (final InvocationTargetException e) {
throw e.getTargetException();
@ -263,6 +282,25 @@ public class Hack {
return source_class.getDeclaredMethod(mirror_method.getName(), mirror_method.getParameterTypes());
}
private static @Nullable Pair<Boolean, Field> extractFieldGetterOrSetterFromMethod(final Method mirror_method, final Class<?> source_class) {
final String mirror_method_name = mirror_method.getName(); final char first_char;
if (mirror_method_name.length() > 3 && Character.isUpperCase(first_char = mirror_method_name.charAt(3))) {
final boolean is_getter = mirror_method_name.startsWith("get");
if (is_getter) {
if (getParameterCount(mirror_method) != 0) return null; // Getter should have no parameter
} else if (! mirror_method_name.startsWith("set") || getParameterCount(mirror_method) != 1) return null;
try {
final Field field = source_class.getDeclaredField(toLowerCase(first_char) + mirror_method_name.substring(4));
return new Pair<>(is_getter, field);
} catch (final NoSuchFieldException ignored) {}
}
return null;
}
private static int getParameterCount(final Method mirror_method) {
return SDK_INT >= O ? mirror_method.getParameterCount() : mirror_method.getParameterTypes().length;
}
public static class AssertionException extends Throwable {
private HackedClass<?> mClass;