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kevinthecheungkevinthecheung
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Add App Check snippets
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‎appcheck/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild
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.cxx
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local.properties

‎appcheck/app/.gitignore‎

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/build

‎appcheck/app/build.gradle‎

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plugins {
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id 'com.android.application'
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}
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apply plugin: 'kotlin-android'
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android {
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compileSdkVersion 30
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defaultConfig {
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applicationId "com.google.firebase.example.appcheck"
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minSdkVersion 16
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targetSdkVersion 30
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.3.1'
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implementation 'com.google.android.material:material:1.4.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
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implementation 'com.google.firebase:firebase-appcheck:16.0.0-beta02'
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implementation 'com.google.firebase:firebase-appcheck-debug:16.0.0-beta02'
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implementation 'com.google.firebase:firebase-appcheck-safetynet:16.0.0-beta02'
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implementation 'com.squareup.retrofit2:retrofit:2.9.0'
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implementation "androidx.core:core-ktx:1.6.0"
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implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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}
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repositories {
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mavenCentral()
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}

‎appcheck/app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎appcheck/app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.google.firebase.example.appcheck">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/Theme.AppCheckSnippets">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎appcheck/app/src/main/java/com/google/firebase/example/appcheck/ApiWithAppCheckExample.java‎

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package com.google.firebase.example.appcheck;
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import androidx.annotation.NonNull;
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import com.google.android.gms.tasks.OnSuccessListener;
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import com.google.firebase.appcheck.AppCheckToken;
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import com.google.firebase.appcheck.FirebaseAppCheck;
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import java.util.List;
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import retrofit2.Call;
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import retrofit2.Retrofit;
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import retrofit2.http.GET;
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import retrofit2.http.Header;
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// [START appcheck_custom_backend]
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public class ApiWithAppCheckExample {
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private interface YourExampleBackendService {
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@GET("yourExampleEndpoint")
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Call<List<String>> exampleData(@Header("X-Firebase-AppCheck") String appCheckToken);
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}
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YourExampleBackendService yourExampleBackendService = new Retrofit.Builder()
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.baseUrl("https://yourbackend.example.com/yourApiEndpoint")
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.build()
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.create(YourExampleBackendService.class);
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public void callApiExample() {
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FirebaseAppCheck.getInstance()
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.getAppCheckToken(false)
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.addOnSuccessListener(new OnSuccessListener<AppCheckToken>() {
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@Override
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public void onSuccess(@NonNull AppCheckToken tokenResponse) {
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String appCheckToken = tokenResponse.getToken();
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Call<List<String>> apiCall = yourExampleBackendService.exampleData(appCheckToken);
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// ...
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}
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});
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}
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}
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// [END appcheck_custom_backend]

‎appcheck/app/src/main/java/com/google/firebase/example/appcheck/CustomProvider.java‎

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package com.google.firebase.example.appcheck;
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import android.content.Context;
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import androidx.annotation.NonNull;
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import com.google.android.gms.tasks.Task;
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import com.google.android.gms.tasks.Tasks;
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import com.google.firebase.FirebaseApp;
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import com.google.firebase.appcheck.AppCheckProvider;
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import com.google.firebase.appcheck.AppCheckProviderFactory;
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import com.google.firebase.appcheck.AppCheckToken;
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import com.google.firebase.appcheck.FirebaseAppCheck;
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public class CustomProvider {
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// [START appcheck_custom_provider]
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public class YourCustomAppCheckToken extends AppCheckToken {
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private String token;
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private long expiration;
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YourCustomAppCheckToken(String token, long expiration) {
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this.token = token;
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this.expiration = expiration;
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}
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@NonNull
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@Override
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public String getToken() {
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return token;
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}
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@Override
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public long getExpireTimeMillis() {
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return expiration;
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}
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}
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public class YourCustomAppCheckProvider implements AppCheckProvider {
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public YourCustomAppCheckProvider(FirebaseApp firebaseApp) {
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// ...
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}
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@NonNull
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@Override
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public Task<AppCheckToken> getToken() {
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// Logic to exchange proof of authenticity for an App Check token and
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// expiration time.
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// [START_EXCLUDE]
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long expirationFromServer = 0L;
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String tokenFromServer = "token";
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// [END_EXCLUDE]
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// Refresh the token early to handle clock skew.
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long expMillis = expirationFromServer * 1000L - 60000L;
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// Create AppCheckToken object.
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AppCheckToken appCheckToken =
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new YourCustomAppCheckToken(tokenFromServer, expMillis);
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return Tasks.forResult(appCheckToken);
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}
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}
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// [END appcheck_custom_provider]
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// [START appcheck_custom_provider_factory]
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public class YourCustomAppCheckProviderFactory implements AppCheckProviderFactory {
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@NonNull
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@Override
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public AppCheckProvider create(@NonNull FirebaseApp firebaseApp) {
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// Create and return an AppCheckProvider object.
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return new YourCustomAppCheckProvider(firebaseApp);
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}
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}
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// [END appcheck_custom_provider_factory]
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private void init(Context context) {
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// [START appcheck_initialize_custom_provider]
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FirebaseApp.initializeApp(/*context=*/ context);
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FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
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firebaseAppCheck.installAppCheckProviderFactory(
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new YourCustomAppCheckProviderFactory());
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// [END appcheck_initialize_custom_provider]
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}
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}

‎appcheck/app/src/main/java/com/google/firebase/example/appcheck/MainActivity.java‎

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package com.google.firebase.example.appcheck;
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import androidx.appcompat.app.AppCompatActivity;
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import android.os.Bundle;
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import com.google.firebase.FirebaseApp;
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import com.google.firebase.appcheck.FirebaseAppCheck;
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import com.google.firebase.appcheck.debug.DebugAppCheckProviderFactory;
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import com.google.firebase.appcheck.safetynet.SafetyNetAppCheckProviderFactory;
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public class MainActivity extends AppCompatActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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}
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private void init() {
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// [START appcheck_initialize]
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FirebaseApp.initializeApp(/*context=*/ this);
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FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
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firebaseAppCheck.installAppCheckProviderFactory(
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SafetyNetAppCheckProviderFactory.getInstance());
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// [END appcheck_initialize]
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}
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private void initDebug() {
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// [START appcheck_initialize_debug]
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FirebaseApp.initializeApp(/*context=*/ this);
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FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
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firebaseAppCheck.installAppCheckProviderFactory(
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DebugAppCheckProviderFactory.getInstance());
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// [END appcheck_initialize_debug]
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}
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}

‎appcheck/app/src/main/java/com/google/firebase/example/appcheck/kotlin/ApiWithAppCheckExample.kt‎

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package com.google.firebase.example.appcheck.kotlin
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import com.google.firebase.appcheck.FirebaseAppCheck
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import retrofit2.Call
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import retrofit2.Retrofit
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import retrofit2.http.GET
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import retrofit2.http.Header
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// [START appcheck_custom_backend]
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class ApiWithAppCheckExample {
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interface YourExampleBackendService {
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@GET("yourExampleEndpoint")
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fun exampleData(
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@Header("X-Firebase-AppCheck") appCheckToken: String
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): Call<List<String>>
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}
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var yourExampleBackendService: YourExampleBackendService = Retrofit.Builder()
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.baseUrl("https://yourbackend.example.com/yourApiEndpoint")
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.build()
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.create(YourExampleBackendService::class.java)
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fun callApiExample() {
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FirebaseAppCheck.getInstance()
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.getAppCheckToken(false)
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.addOnSuccessListener { tokenResponse ->
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val appCheckToken = tokenResponse.token
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val apiCall = yourExampleBackendService.exampleData(appCheckToken)
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// ...
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}
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}
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}
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// [END appcheck_custom_backend]

‎appcheck/app/src/main/java/com/google/firebase/example/appcheck/kotlin/CustomProvider.kt‎

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package com.google.firebase.example.appcheck.kotlin
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import android.content.Context
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import com.google.android.gms.tasks.Task
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import com.google.android.gms.tasks.Tasks
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import com.google.firebase.FirebaseApp
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import com.google.firebase.appcheck.AppCheckProvider
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import com.google.firebase.appcheck.AppCheckProviderFactory
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import com.google.firebase.appcheck.AppCheckToken
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import com.google.firebase.appcheck.FirebaseAppCheck
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class CustomProvider {
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// [START appcheck_custom_provider]
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class YourCustomAppCheckToken(
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private val token: String,
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private val expiration: Long
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) : AppCheckToken() {
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override fun getToken(): String = token
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override fun getExpireTimeMillis(): Long = expiration
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}
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class YourCustomAppCheckProvider(firebaseApp: FirebaseApp) : AppCheckProvider {
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override fun getToken(): Task<AppCheckToken> {
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// Logic to exchange proof of authenticity for an App Check token and
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// expiration time.
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// [START_EXCLUDE]
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val expirationFromServer = 0L
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val tokenFromServer = "token"
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// [END_EXCLUDE]
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// Refresh the token early to handle clock skew.
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val expMillis = expirationFromServer * 1000L - 60000L
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// Create AppCheckToken object.
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val appCheckToken: AppCheckToken = YourCustomAppCheckToken(tokenFromServer, expMillis)
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return Tasks.forResult(appCheckToken)
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}
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}
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// [END appcheck_custom_provider]
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// [START appcheck_custom_provider_factory]
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class YourCustomAppCheckProviderFactory : AppCheckProviderFactory {
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override fun create(firebaseApp: FirebaseApp): AppCheckProvider {
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// Create and return an AppCheckProvider object.
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return YourCustomAppCheckProvider(firebaseApp)
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}
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}
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// [END appcheck_custom_provider_factory]
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private fun init(context: Context) {
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// [START appcheck_initialize_custom_provider]
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FirebaseApp.initializeApp(/*context=*/ context)
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val firebaseAppCheck = FirebaseAppCheck.getInstance()
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firebaseAppCheck.installAppCheckProviderFactory(
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YourCustomAppCheckProviderFactory()
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)
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// [END appcheck_initialize_custom_provider]
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}
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}

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