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first mockup of billing client emulation
mainly getting the classloader to work
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‎LuckyXposed/README.md‎

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# LuckyXposed
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Emulate in-app purchases.

‎LuckyXposed/build.gradle.kts‎

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plugins {
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alias(libs.plugins.buildlogic.android.application)
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alias(libs.plugins.buildlogic.kotlin.android)
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}
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android {
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namespace = "com.programminghoch10.LuckyXposed"
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defaultConfig {
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minSdk = 33
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targetSdk = 35
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}
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}
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//noinspection UseTomlInstead
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dependencies {
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val billingVersion = "8.0.0"
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compileOnly("com.android.billingclient:billing:$billingVersion")
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//compileOnly("com.android.billingclient:billing-ktx:${billingVersion}")
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}

‎LuckyXposed/metadata/com.programminghoch10.LuckyXposed/en-US/full_description.txt‎

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Emulate in-app purchases.

‎LuckyXposed/metadata/com.programminghoch10.LuckyXposed/en-US/short_description.txt‎

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Emulate in-app purchases.

‎LuckyXposed/metadata/com.programminghoch10.LuckyXposed/en-US/title.txt‎

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LuckyXposed

‎LuckyXposed/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest
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xmlns:android="http://schemas.android.com/apk/res/android">
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<application android:label="LuckyXposed">
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<meta-data
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android:name="xposedmodule"
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android:value="true"
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/>
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<meta-data
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android:name="xposeddescription"
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android:value="Emulate successful in-app purchases."
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/>
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<meta-data
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android:name="xposedminversion"
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android:value="53"
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/>
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</application>
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</manifest>

‎LuckyXposed/src/main/assets/xposed_init‎

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com.programminghoch10.LuckyXposed.LuckyHook

‎LuckyXposed/src/main/java/com/programminghoch10/LuckyXposed/BillingClientBuilderStub.java‎

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package com.programminghoch10.LuckyXposed;
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import android.content.Context;
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import android.util.Log;
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import com.android.billingclient.api.BillingClient;
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import com.android.billingclient.api.PurchasesUpdatedListener;
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import com.android.billingclient.api.UserChoiceBillingListener;
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public class BillingClientBuilderStub {
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private static final String TAG = "Logger";
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Context context;
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BillingClientBuilderStub(Context context) {
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this.context = context;
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}
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public BillingClientBuilderStub enableAlternativeBillingOnly() {
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return this;
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}
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public BillingClientBuilderStub enableExternalOffer() {
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return this;
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}
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public BillingClientBuilderStub enablePendingPurchases() {
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return this;
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}
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public BillingClientBuilderStub enableUserChoiceBilling(UserChoiceBillingListener userChoiceBillingListener) {
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return this;
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}
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PurchasesUpdatedListener purchasesUpdatedListener;
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public BillingClientBuilderStub setListener(PurchasesUpdatedListener purchasesUpdatedListener) {
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this.purchasesUpdatedListener = purchasesUpdatedListener;
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return this;
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}
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public BillingClient build() {
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Log.d(TAG, "build: build billingclient");
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if (purchasesUpdatedListener == null)
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throw new IllegalArgumentException("no purchasesUpdatedListener specified");
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return new BillingClientStub(context, purchasesUpdatedListener);
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}
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}

‎LuckyXposed/src/main/java/com/programminghoch10/LuckyXposed/BillingClientStub.java‎

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package com.programminghoch10.LuckyXposed;
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import android.app.Activity;
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import android.content.Context;
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import android.os.Handler;
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import android.os.Looper;
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import android.util.Log;
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import androidx.annotation.NonNull;
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import java.lang.reflect.Proxy;
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import java.util.ArrayList;
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import java.util.List;
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import com.android.billingclient.api.AcknowledgePurchaseParams;
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import com.android.billingclient.api.AcknowledgePurchaseResponseListener;
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import com.android.billingclient.api.AlternativeBillingOnlyAvailabilityListener;
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import com.android.billingclient.api.AlternativeBillingOnlyInformationDialogListener;
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import com.android.billingclient.api.AlternativeBillingOnlyReportingDetailsListener;
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import com.android.billingclient.api.BillingClient;
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import com.android.billingclient.api.BillingClientStateListener;
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import com.android.billingclient.api.BillingConfigResponseListener;
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import com.android.billingclient.api.BillingFlowParams;
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import com.android.billingclient.api.BillingResult;
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import com.android.billingclient.api.ConsumeParams;
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import com.android.billingclient.api.ConsumeResponseListener;
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import com.android.billingclient.api.ExternalOfferAvailabilityListener;
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import com.android.billingclient.api.ExternalOfferInformationDialogListener;
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import com.android.billingclient.api.ExternalOfferReportingDetailsListener;
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import com.android.billingclient.api.GetBillingConfigParams;
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import com.android.billingclient.api.InAppMessageParams;
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import com.android.billingclient.api.InAppMessageResponseListener;
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import com.android.billingclient.api.ProductDetails;
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import com.android.billingclient.api.ProductDetailsResponseListener;
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import com.android.billingclient.api.Purchase;
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import com.android.billingclient.api.PurchaseHistoryResponseListener;
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import com.android.billingclient.api.PurchasesResponseListener;
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import com.android.billingclient.api.PurchasesUpdatedListener;
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import com.android.billingclient.api.QueryProductDetailsParams;
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import com.android.billingclient.api.QueryPurchasesParams;
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public class BillingClientStub extends BillingClient {
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private static final BillingResult BillingResultOK =
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BillingResult
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.newBuilder()
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.setResponseCode(BillingResponseCode.OK)
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.setDebugMessage("BillingClientStub BillingResultOK")
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.build();
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private static final String TAG = "Logger";
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private final Context context;
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private final PurchasesUpdatedListener purchasesUpdatedListener;
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BillingClientStub(Context context, PurchasesUpdatedListener purchasesUpdatedListener) {
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super();
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this.context = context;
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this.purchasesUpdatedListener = purchasesUpdatedListener;
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Log.d(TAG, "BillingClientStub: construct stub");
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}
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@Override
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public int getConnectionState() {
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Log.d(TAG, "getConnectionState: ");
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return ConnectionState.CONNECTED;
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}
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@NonNull
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@Override
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public BillingResult isFeatureSupported(@NonNull String s) {
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Log.d(TAG, "isFeatureSupported: ");
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return BillingResultOK;
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}
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@NonNull
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@Override
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public BillingResult launchBillingFlow(@NonNull Activity activity, @NonNull BillingFlowParams billingFlowParams) {
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Log.d(TAG, "launchBillingFlow: ");
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return BillingResultOK;
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}
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@NonNull
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@Override
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public BillingResult showAlternativeBillingOnlyInformationDialog(
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@NonNull Activity activity,
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@NonNull AlternativeBillingOnlyInformationDialogListener alternativeBillingOnlyInformationDialogListener
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) {
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throw new IllegalStateException("not implemented");
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}
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@NonNull
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@Override
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public BillingResult showExternalOfferInformationDialog(
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@NonNull Activity activity,
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@NonNull ExternalOfferInformationDialogListener externalOfferInformationDialogListener
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) {
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throw new IllegalStateException("not implemented");
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}
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@NonNull
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@Override
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public BillingResult showInAppMessages(
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@NonNull Activity activity,
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@NonNull InAppMessageParams inAppMessageParams,
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@NonNull InAppMessageResponseListener inAppMessageResponseListener
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) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void acknowledgePurchase(
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@NonNull AcknowledgePurchaseParams acknowledgePurchaseParams,
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@NonNull AcknowledgePurchaseResponseListener acknowledgePurchaseResponseListener
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) {
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Log.d(TAG, "acknowledgePurchase: ");
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acknowledgePurchaseResponseListener.onAcknowledgePurchaseResponse(BillingResultOK);
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}
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@Override
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public void consumeAsync(@NonNull ConsumeParams consumeParams, @NonNull ConsumeResponseListener consumeResponseListener) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void createAlternativeBillingOnlyReportingDetailsAsync(@NonNull AlternativeBillingOnlyReportingDetailsListener alternativeBillingOnlyReportingDetailsListener) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void createExternalOfferReportingDetailsAsync(@NonNull ExternalOfferReportingDetailsListener externalOfferReportingDetailsListener) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void endConnection() {
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Log.d(TAG, "endConnection: ");
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this.isReady = false;
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}
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@Override
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public void getBillingConfigAsync(
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@NonNull GetBillingConfigParams getBillingConfigParams,
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@NonNull BillingConfigResponseListener billingConfigResponseListener
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) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void isAlternativeBillingOnlyAvailableAsync(@NonNull AlternativeBillingOnlyAvailabilityListener alternativeBillingOnlyAvailabilityListener) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void isExternalOfferAvailableAsync(@NonNull ExternalOfferAvailabilityListener externalOfferAvailabilityListener) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void queryProductDetailsAsync(
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@NonNull QueryProductDetailsParams queryProductDetailsParams,
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@NonNull ProductDetailsResponseListener productDetailsResponseListener
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) {
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throw new IllegalStateException("not implemented");
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}
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@Override
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public void queryPurchasesAsync(
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@NonNull QueryPurchasesParams queryPurchasesParams,
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@NonNull PurchasesResponseListener purchasesResponseListener
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) {
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throw new IllegalStateException("not implemented");
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}
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BillingClientStateListener billingClientStateListener = null;
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@Override
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public void startConnection(@NonNull BillingClientStateListener billingClientStateListener) {
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Log.d(TAG, "startConnection: ");
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this.billingClientStateListener = billingClientStateListener;
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this.isReady = true;
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billingClientStateListener.onBillingSetupFinished(BillingResultOK);
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}
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boolean isReady = false;
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@Override
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public boolean isReady() {
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Log.d(TAG, "isReady: " + isReady);
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return isReady;
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}
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public static BillingClientBuilderStub newBuilderStub(@NonNull Context context) {
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return new BillingClientBuilderStub(context);
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}
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}

‎LuckyXposed/src/main/java/com/programminghoch10/LuckyXposed/LuckyHook.kt‎

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package com.programminghoch10.LuckyXposed
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import kotlin.collections.map
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import android.content.Context
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import android.util.Log
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import com.android.billingclient.api.BillingClient
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import com.android.billingclient.api.PurchasesUpdatedListener
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import de.robv.android.xposed.IXposedHookLoadPackage
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import de.robv.android.xposed.XC_MethodHook
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import de.robv.android.xposed.XposedHelpers
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import de.robv.android.xposed.callbacks.XC_LoadPackage
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class LuckyHook : IXposedHookLoadPackage {
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public val TAG = "Logger"
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val LogHook = object: XC_MethodHook() {
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override fun beforeHookedMethod(param: MethodHookParam) {
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Log.d(TAG, "beforeHookedMethod: ${param.method.name}")
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}
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override fun afterHookedMethod(param: MethodHookParam) {
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Log.d(TAG, "afterHookedMethod: ${param.method.name}")
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}
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}
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override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam) {
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val moduleClassLoader = this::class.java.classLoader!!
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val BootClassLoaderClass = XposedHelpers.findClass("java.lang.BootClassLoader", moduleClassLoader)
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fun isBootClassLoader(classLoader: ClassLoader):Boolean {
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return BootClassLoaderClass.isAssignableFrom(classLoader::class.java)
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}
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fun getClassLoaderParentList(classLoader: ClassLoader) : List<ClassLoader> {
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return generateSequence(classLoader, {it.parent}).toList()
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}
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fun getClassLoaderParentListWithoutBootClassLoader(classLoader: ClassLoader) : List<ClassLoader> {
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return getClassLoaderParentList(classLoader).filterNot(::isBootClassLoader)
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}
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if (!cartesianProduct(getClassLoaderParentListWithoutBootClassLoader(moduleClassLoader), getClassLoaderParentListWithoutBootClassLoader(lpparam.classLoader))
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.any { (first, second) ->
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first == second
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}) {
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// determine top level classloader before BootClassLoader
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val topClassLoader = getClassLoaderParentListWithoutBootClassLoader(moduleClassLoader).last()
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XposedHelpers.setObjectField(topClassLoader, "parent", lpparam.classLoader)
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}
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/*XposedHelpers.findAndHookMethod(BillingClientClass, "newBuilder",
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Context::class.java,
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object: XC_MethodReplacement() {
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override fun replaceHookedMethod(param: MethodHookParam): BillingClientBuilderStub {
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val context : Context = param.args[0] as Context
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Log.d(TAG, "replaceHookedMethod: replace newBuilder with stub context=${context}")
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return BillingClientStub.newBuilderStub(context)
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}
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})*/
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fun getFieldByType(obj: Any, clazz: Class<*>): Any? {
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Log.d(TAG, "getFieldByType: obj=${obj} clazz=${clazz}")
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Log.d(TAG, "getFieldByType: ${obj.javaClass.declaredFields.size}")
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Log.d(TAG, "getFieldByType: ${obj::class.java.declaredFields.map { it.type to it.type.isAssignableFrom(clazz)}.filter { it.second }}")
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return XposedHelpers.getObjectField(obj, obj::class.java.declaredFields.find { it.type.isAssignableFrom(clazz)}!!.name)
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}
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XposedHelpers.findAndHookMethod(BillingClient.Builder::class.java, "build", object: XC_MethodHook() {
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override fun beforeHookedMethod(param: MethodHookParam) {
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val purchasesUpdatedListener = getFieldByType(param.thisObject, PurchasesUpdatedListener::class.java) as PurchasesUpdatedListener?
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if (purchasesUpdatedListener == null) {
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Log.w(TAG, "replaceHookedMethod: purchasesUpdatedListener is null, not hooking further")
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return
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}
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val context = getFieldByType(param.thisObject, Context::class.java) as Context?
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if (context == null) {
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Log.e(TAG, "replaceHookedMethod: context is null")
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return
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}
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Log.d(TAG, "replaceHookedMethod: purchasesUpdatedListener=${purchasesUpdatedListener}")
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//param.result = BillingClientStub(context, purchasesUpdatedListener)
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param.result = BillingClientStub.newBuilderStub(context).setListener(purchasesUpdatedListener).build()
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}
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})
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}
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}

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