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AuthTab project example
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‎androidbrowserhelper/build.gradle

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@@ -20,6 +20,7 @@ apply plugin: 'maven-publish'
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def VERSION = "2.5.0";
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android {
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namespace "com.google.androidbrowserhelper"
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compileSdkVersion 31
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defaultConfig {

‎build.gradle

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repositories {
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google()
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jcenter()
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maven {
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url = uri("https://androidx.dev/snapshots/builds/12502757/artifacts/repository")
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}
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}
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dependencies {
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classpath 'com.android.tools.build:gradle:4.1.1'
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classpath 'com.android.tools.build:gradle:8.7.2'
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}
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}
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allprojects {
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repositories {
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google()
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jcenter()
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maven {
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url = uri("https://androidx.dev/snapshots/builds/12502757/artifacts/repository")
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}
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}
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}
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‎demos/custom-tabs-authview/.gitignore

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/build

‎demos/custom-tabs-authview/build.gradle

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/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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apply plugin: 'com.android.application'
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android {
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namespace 'com.google.androidbrowserhelper.demos.customtabsauthview'
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compileSdkVersion 35
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defaultConfig {
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applicationId "com.google.androidbrowserhelper.demos.customtabsauthview"
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minSdkVersion 26
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targetSdkVersion 35
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versionCode 1
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versionName "1.0"
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}
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buildTypes {
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release {
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minifyEnabled false
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_17
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targetCompatibility JavaVersion.VERSION_17
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}
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}
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dependencies {
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implementation project(path: ':androidbrowserhelper')
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implementation fileTree(dir: "libs", include: ["*.jar"])
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implementation 'androidx.appcompat:appcompat:1.7.0'
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implementation 'androidx.activity:activity:1.9.3'
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implementation 'androidx.browser:browser:1.9.0-SNAPSHOT'
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implementation 'com.google.android.material:material:1.12.0'
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implementation 'androidx.annotation:annotation:1.9.1'
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implementation 'androidx.constraintlayout:constraintlayout:2.2.0'
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}

‎demos/custom-tabs-authview/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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xmlns:tools="http://schemas.android.com/tools"
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package="com.google.androidbrowserhelper.demos.customtabsauthview">
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<uses-permission android:name="android.permission.INTERNET" />
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<application
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android:allowBackup="true"
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android:dataExtractionRules="@xml/data_extraction_rules"
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android:fullBackupContent="@xml/backup_rules"
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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.AuthTab"
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tools:targetApi="31">
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<activity
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android:name=".MainActivity"
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android:exported="true">
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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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<!-- An intent-filter for fallback to Chrome Custom Tabs -->
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<intent-filter android:autoVerify="true">
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<action android:name="android.intent.action.VIEW" />
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<category android:name="android.intent.category.DEFAULT" />
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<category android:name="android.intent.category.BROWSABLE" />
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<data android:scheme="auth" />
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<data android:host="callback" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎demos/custom-tabs-authview/src/main/java/com/google/androidbrowserhelper/demos/customtabsauthview/AuthManager.java

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package com.google.androidbrowserhelper.demos.customtabsauthview;
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import android.content.Context;
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import android.content.Intent;
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import android.content.SharedPreferences;
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import android.net.Uri;
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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.activity.result.ActivityResultLauncher;
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import androidx.annotation.NonNull;
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import androidx.browser.auth.AuthTabIntent;
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import androidx.annotation.OptIn;
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import androidx.browser.auth.ExperimentalAuthTab;
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import java.io.IOException;
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import java.util.UUID;
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@OptIn(markerClass = ExperimentalAuthTab.class)
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public class AuthManager {
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private static final String TAG = "OAuthManager";
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private final String mClientId;
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private final String mClientSecret;
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private final String mAuthorizationEndpoint;
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private final String mRedirectScheme;
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public interface OAuthCallback {
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void auth(String accessToken, String scope, String tokenType);
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}
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public AuthManager(String clientId, String clientSecret, String authorizationEndpoint,
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String redirectScheme) {
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mClientId = clientId;
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mClientSecret = clientSecret;
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mAuthorizationEndpoint = authorizationEndpoint;
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mRedirectScheme = redirectScheme;
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}
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public void authorize(Context context, ActivityResultLauncher<Intent> launcher, String scope) {
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// Generate a random state.
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String state = UUID.randomUUID().toString();
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// Save the state so we can verify later.
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SharedPreferences preferences =
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context.getSharedPreferences("OAUTH_STORAGE", Context.MODE_PRIVATE);
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preferences.edit()
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.putString("OAUTH_STATE", state)
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.apply();
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// Create an authorization URI to the OAuth Endpoint.
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Uri uri = Uri.parse(mAuthorizationEndpoint)
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.buildUpon()
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.appendQueryParameter("response_type", "code")
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.appendQueryParameter("client_id", mClientId)
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.appendQueryParameter("scope", scope)
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.appendQueryParameter("state", state)
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.build();
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// Open the Authorization URI in a Chrome Custom Auth Tab.
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AuthTabIntent authTabIntent = new AuthTabIntent.Builder().build();
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authTabIntent.launch(launcher, uri, mRedirectScheme);
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}
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public void continueAuthFlow(@NonNull Context context, Uri uri, @NonNull OAuthCallback callback) {
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String code = uri.getQueryParameter("code");
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SharedPreferences preferences =
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context.getSharedPreferences("OAUTH_STORAGE", Context.MODE_PRIVATE);
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String state = preferences.getString("OAUTH_STATE", "");
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Uri tokenUri = Uri.parse("https://github.com/login/oauth/access_token")
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.buildUpon()
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.appendQueryParameter("client_id", mClientId)
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.appendQueryParameter("client_secret", mClientSecret)
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.appendQueryParameter("code", code)
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.appendQueryParameter("state", state)
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.build();
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// Run the network request off the UI thread.
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new Thread(() -> {
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try {
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String response = Utils.fetch(tokenUri);
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// The response is a query-string. We concatenate with a valid domain to be
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// able to easily parse and extract values.
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Uri responseUri = Uri.parse("http://example.com?" + response);
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String accessToken = responseUri.getQueryParameter("access_token");
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String tokenType = responseUri.getQueryParameter("token_type");
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String scope = responseUri.getQueryParameter("scope");
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// Invoke the callback in the main thread.
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new Handler(Looper.getMainLooper()).post(
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() -> callback.auth(accessToken, scope, tokenType));
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} catch (IOException e) {
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Log.e(TAG, "Error requesting access token: " + e.getMessage());
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}
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}).start();
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}
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}

‎demos/custom-tabs-authview/src/main/java/com/google/androidbrowserhelper/demos/customtabsauthview/GithubApi.java

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package com.google.androidbrowserhelper.demos.customtabsauthview;
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import android.net.Uri;
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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 org.json.JSONException;
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import org.json.JSONObject;
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import java.io.IOException;
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import java.util.Collections;
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import java.util.Map;
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public class GithubApi {
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private static final String TAG = "GithubAPI";
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private static final String API_ENDPOINT = "https://api.github.com/user";
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private static final String AUTH_HEADER_KEY = "Authorization";
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public interface UserCallback {
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void onUserData(String username);
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}
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public static void requestGithubUsername(String token, UserCallback callback) {
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new Thread(() -> {
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try {
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Uri uri = Uri.parse(API_ENDPOINT);
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Map<String, String> headers =
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Collections.singletonMap(AUTH_HEADER_KEY, "token " + token);
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String response = Utils.fetch(uri, headers);
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JSONObject user = new JSONObject(response);
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String username = user.getString("name");
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// Invoke the callback in the main thread.
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new Handler(Looper.getMainLooper()).post(() -> {
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callback.onUserData(username);
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});
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} catch (IOException | JSONException ex) {
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Log.e(TAG, "Error fetching GitHub user: " + ex.getMessage());
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}
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}).start();
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}
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}

‎demos/custom-tabs-authview/src/main/java/com/google/androidbrowserhelper/demos/customtabsauthview/MainActivity.java

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/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.androidbrowserhelper.demos.customtabsauthview;
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import android.content.Intent;
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import android.net.Uri;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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import android.widget.ProgressBar;
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import android.widget.TextView;
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import androidx.activity.result.ActivityResultLauncher;
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import androidx.annotation.OptIn;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.browser.auth.AuthTabIntent;
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import androidx.browser.auth.ExperimentalAuthTab;
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@OptIn(markerClass = ExperimentalAuthTab.class)
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public class MainActivity extends AppCompatActivity {
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private static final String TAG = "MainActivity";
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private static final String AUTHORIZATION_ENDPOINT = "https://github.com/login/oauth/authorize";
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private static final String CLIENT_ID = "<github-client-id>";
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private static final String CLIENT_SECRET = "<github-client-secret>";
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private static final String REDIRECT_SCHEME = "auth";
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private static final AuthManager O_AUTH_MANAGER =
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new AuthManager(CLIENT_ID, CLIENT_SECRET, AUTHORIZATION_ENDPOINT, REDIRECT_SCHEME);
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private final ActivityResultLauncher<Intent> mLauncher =
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AuthTabIntent.registerActivityResultLauncher(this, this::handleAuthResult);
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private Button mLoginButton;
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private TextView mUserText;
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private ProgressBar mProgressBar;
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private boolean mLoggedIn;
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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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mLoginButton = findViewById(R.id.login_button);
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mUserText = findViewById(R.id.user_text);
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mProgressBar = findViewById(R.id.progress_bar);
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Intent intent = getIntent();
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if (intent != null) {
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Uri data = intent.getData();
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if (data != null && data.getHost() != null
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&& data.getHost().startsWith("callback")) {
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mProgressBar.setVisibility(View.VISIBLE);
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mLoginButton.setEnabled(false);
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completeAuth(data);
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}
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}
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}
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public void login(View v) {
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if (mLoggedIn) {
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mLoginButton.setText(R.string.login);
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mUserText.setText(R.string.logged_out);
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mLoggedIn = false;
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} else {
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O_AUTH_MANAGER.authorize(this, mLauncher, "user");
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}
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}
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private void handleAuthResult(AuthTabIntent.AuthResult result) {
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if (result.resultCode == AuthTabIntent.RESULT_OK) {
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completeAuth(result.resultUri);
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}
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}
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private void completeAuth(Uri uri) {
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O_AUTH_MANAGER.continueAuthFlow(this, uri, (accessToken, scope, tokenType) -> {
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GithubApi.requestGithubUsername(accessToken, (username -> {
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mLoginButton.setText(R.string.logout);
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mLoginButton.setEnabled(true);
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mProgressBar.setVisibility(View.INVISIBLE);
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mUserText.setText(getString(R.string.logged_in, username));
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mLoggedIn = true;
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}));
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});
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}
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}

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