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Dynamic load updated APK for patching

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Magisk Manager sometimes updates the code for patching the APK due to several changes.
When an old manager tries to patch an updated APK using its internal methods, it is
sometimes incomplete, or simply won't work at all.

This commit exposes an API that can be dynamically loaded from an old app to invoke the
updated patchAPK method from the downloaded new APK.
This commit is contained in:
topjohnwu 2018-12-31 15:53:24 +08:00
parent 2e10fa494f
commit 6d27eb7f64
3 changed files with 22 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
app/src/full/java/a/a.java
View File

@ -1,10 +1,13 @@
package a;
import com.topjohnwu.core.utils.BootSigner;
import com.topjohnwu.magisk.utils.PatchAPK;
import androidx.annotation.Keep;
@Keep
public class a extends BootSigner {
/* stub */
public static boolean patchAPK(String in, String out, String pkg) {
return PatchAPK.patch(in, out, pkg);
}
}

14
app/src/full/java/com/topjohnwu/magisk/utils/DownloadApp.java
View File

@ -19,6 +19,8 @@ import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import dalvik.system.DexClassLoader;
public class DownloadApp {
public static void upgrade(String name) {
@ -72,10 +74,16 @@ public class DownloadApp {
progress.update();
patched = new File(apk.getParent(), "patched.apk");
try {
JarMap jarMap = PatchAPK.patch(apk.getPath(), app.getPackageName());
SignAPK.sign(jarMap, new BufferedOutputStream(new FileOutputStream(patched)));
// Try using the new APK to patch itself
ClassLoader loader = new DexClassLoader(apk.getPath(),
apk.getParent(), null, ClassLoader.getSystemClassLoader());
loader.loadClass("a.a")
.getMethod("patchAPK", String.class, String.class, String.class)
.invoke(null, apk.getPath(), patched.getPath(), app.getPackageName());
} catch (Exception e) {
return;
e.printStackTrace();
// Fallback to use the current implementation
PatchAPK.patch(apk.getPath(), patched.getPath(), app.getPackageName());
}
}
APKInstall.install(app, patched);

19
app/src/full/java/com/topjohnwu/magisk/utils/PatchAPK.java
View File

@ -102,14 +102,8 @@ public class PatchAPK {
File repack = new File(app.getFilesDir(), "patched.apk");
String pkg = genPackageName("com.", BuildConfig.APPLICATION_ID.length());
try {
JarMap apk;
if ((apk = patch(app.getPackageCodePath(), pkg)) == null)
if (!patch(app.getPackageCodePath(), repack.getPath(), pkg))
return false;
SignAPK.sign(apk, new BufferedOutputStream(new FileOutputStream(repack)));
} catch (Exception e) {
return false;
}
// Install the application
repack.setReadable(true, false);
@ -123,23 +117,24 @@ public class PatchAPK {
return true;
}
public static JarMap patch(String apk, String pkg) {
public static boolean patch(String in, String out, String pkg) {
try {
JarMap jar = new JarMap(apk);
JarMap jar = new JarMap(in);
JarEntry je = jar.getJarEntry(Const.ANDROID_MANIFEST);
byte xml[] = jar.getRawData(je);
if (!findAndPatch(xml, BuildConfig.APPLICATION_ID, pkg) ||
!findAndPatch(xml, R.string.app_name, R.string.re_app_name))
return null;
return false;
// Write in changes
jar.getOutputStream(je).write(xml);
return jar;
SignAPK.sign(jar, new BufferedOutputStream(new FileOutputStream(out)));
} catch (Exception e) {
e.printStackTrace();
return null;
return false;
}
return true;
}
public static void hideManager() {