feat: support android versions down to 1.5 (API 3)

Author: rushiiMachine

app/build.gradle.kts

@@ -8,7 +8,7 @@ android {
 
 	defaultConfig {
 		applicationId = "dev.materii.rushii.xspoofsignatures"
-		minSdk = 16
+		minSdk = 3 // Yes, this is accurate
 		targetSdk = 35
 		versionCode = 1
 		versionName = "1.0.0"
@@ -47,11 +47,6 @@ android {
 			}
 		}
 	}
-
-	compileOptions {
-		sourceCompatibility = JavaVersion.VERSION_1_8
-		targetCompatibility = JavaVersion.VERSION_1_8
-	}
 }
 
 tasks.withType<JavaCompile> {

app/src/main/java/dev/materii/rushii/xspoofsignatures/Main.java

@@ -7,7 +7,6 @@
 import de.robv.android.xposed.*;
 import de.robv.android.xposed.callbacks.XC_LoadPackage.LoadPackageParam;
 
-@SuppressWarnings("deprecation")
 public class Main implements IXposedHookLoadPackage {
 	private static final String TAG = "XSpoofSignatures";
 
@@ -26,6 +25,25 @@ private static Signature[] copySignatures(Signature[] orig, Signature extra) {
 		return signatures;
 	}
 
+	private static String getHookClassName() {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+			// https://cs.android.com/android/platform/superproject/+/android-15.0.0_r1:frameworks/base/services/core/java/com/android/server/pm/ComputerEngine.java;l=1484;drc=d970c566017e2c4a69e545775994fc46e0869247
+			return "com.android.server.pm.ComputerEngine";
+		} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+			// https://cs.android.com/android/platform/superproject/+/android-12.0.0_r1:frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java;l=3302;drc=2cf61babf8de1e5e3a45770632fa067556021291
+			return "com.android.server.pm.PackageManagerService$ComputerEngine";
+		} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+			// https://cs.android.com/android/platform/superproject/+/android-4.0.1_r1:frameworks/base/services/java/com/android/server/pm/PackageManagerService.java;l=1485;drc=58f42a59bda3bc912d0d2f81dc65a9d31d140eaa
+			return "com.android.server.pm.PackageManagerService";
+		} else {
+			// Android SRC is unavailable for Android Honeycomb (3.x) and Android Cupcake (1.5)
+			// but I confirmed this is accurate for those versions by extracting the system image
+
+			// https://cs.android.com/android/platform/superproject/+/android-2.2.3_r1:frameworks/base/services/java/com/android/server/PackageManagerService.java;l=1316;drc=e2fd45af93178b30e6da97b46fcd31b7d30f5426
+			return "com.android.server.PackageManagerService";
+		}
+	}
+
 	@Override
 	public void handleLoadPackage(LoadPackageParam lpparam) {
 		if (!"android".equals(lpparam.packageName)) return;
@@ -58,8 +76,8 @@ protected void afterHookedMethod(MethodHookParam param) {
 				}
 
 				// Check if the permission was granted
-				if (pi.requestedPermissions == null ||
-					pi.requestedPermissionsFlags == null) return;
+				if (pi.requestedPermissions == null || (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN &&
+					pi.requestedPermissionsFlags == null)) return;
 				boolean granted = false;
 				for (int i = 0; i < pi.requestedPermissions.length; i++) {
 					if ("android.permission.FAKE_PACKAGE_SIGNATURE".equals(pi.requestedPermissions[i]) &&
@@ -116,17 +134,9 @@ protected void afterHookedMethod(MethodHookParam param) {
 			}
 		};
 
-		String targetClass;
-		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-			targetClass = "com.android.server.pm.ComputerEngine";
-		} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
-			targetClass = "com.android.server.pm.PackageManagerService$ComputerEngine";
-		} else {
-			targetClass = "com.android.server.pm.PackageManagerService";
-		}
-
-		final Class<?> hookClass = XposedHelpers.findClass(targetClass, lpparam.classLoader);
+		final String hookClassName = getHookClassName();
+		final Class<?> hookClass = XposedHelpers.findClass(hookClassName, lpparam.classLoader);
 		XposedBridge.hookAllMethods(hookClass, "generatePackageInfo", hook);
-		Log.d(TAG, String.format("Hooking %s#generatePackageInfo(...)", targetClass));
+		Log.d(TAG, String.format("Hooking %s#generatePackageInfo(...)", hookClassName));
 	}
 }