[google_sign_in] Bridge google_sign_in and googleapis. (#2824)

Introduce the first version of the `extension_google_sign_in_as_googleapis_auth` package. This package lets users of the `google_sign_in` plugin to create an authenticated HTTP clients (from `googleapis_auth`) that can access any APIs from the `googleapis` package.
2025-05-17 16:56:01 +08:00 · 2020-07-13 17:32:57 -07:00
commit f78546c42f
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--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,75 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Flutter.podspec
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
--- a/.metadata
+++ b/.metadata
@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 5e3e5a2a1a977c34b22f3709109fd237b5cab9c6
+  channel: master
+
+project_type: package
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -0,0 +1,3 @@
+## 1.0.0
+
+* First published version.
--- a/27
+++ b/27
@ -0,0 +1,27 @@
+Copyright 2020 The Flutter Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google LLC nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--- a/README.md
+++ b/README.md
@ -0,0 +1,46 @@
+# extension_google_sign_in_as_googleapis_auth
+
+A bridge package between Flutter's [`google_sign_in` plugin](https://pub.dev/packages/google_sign_in) and Dart's [`googleapis` package](https://pub.dev/packages/googleapis), that is able to create [`googleapis_auth`-like `AuthClient` instances](https://pub.dev/documentation/googleapis_auth/latest/googleapis_auth.auth/AuthClient-class.html) directly from the `GoogleSignIn` plugin.
+
+## Usage
+
+This package is implemented as an [extension method](https://dart.dev/guides/language/extension-methods) on top of the `GoogleSignIn` plugin.
+
+In order to use it, you need to add a `dependency` to your `pubspec.yaml`. Then, wherever you're importing `package:google_sign_in/google_sign_in.dart`, add the following:
+
+```dart
+...
+import 'package:extension_google_sign_in_as_googleapis_auth/extension_google_sign_in_as_googleapis_auth.dart';
+...
+```
+
+From that moment on, your `GoogleSignIn` instance will have an additional `Future<AuthClient> authenticatedClient()` method that you can call once your sign in is successful to retrieve an `AuthClient`.
+
+That object can then be used to create instances of `googleapis` API clients:
+
+```dart
+...
+final peopleApi = PeopleApi(await _googleSignIn.authenticatedClient());
+final response = await peopleApi.people.connections.list(
+  'people/me',
+  personFields: 'names',
+);
+...
+```
+
+## Example
+
+This package contains a modified version of Flutter's Google Sign In example app that uses `package:googleapis`' API clients, instead of raw http requests.
+
+See it [here](https://github.com/flutter/plugins/blob/master/packages/google_sign_in/extension_google_sign_in_as_googleapis_auth/example/lib/main.dart).
+
+The original code (and its license) can be seen [here](https://github.com/flutter/plugins/tree/master/packages/google_sign_in/google_sign_in/example/lib/main.dart).
+
+## Testing
+
+Run tests with `flutter test`.
+
+## Issues and feedback
+
+Please file [issues](https://github.com/flutter/flutter/issues/new)
+to send feedback or report a bug. Thank you!
--- a/example/README.md
+++ b/example/README.md
@ -0,0 +1,8 @@
+# extension_google_sign_in_example
+
+Demonstrates how to use the google_sign_in plugin with the `googleapis` package.
+
+## Getting Started
+
+For help getting started with Flutter, view our online
+[documentation](http://flutter.io/).
--- a/example/android/app/build.gradle
+++ b/example/android/app/build.gradle
@ -0,0 +1,64 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 28
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        applicationId "io.flutter.plugins.googlesigninexample"
+        minSdkVersion 16
+        targetSdkVersion 28
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+
+    testOptions {
+        unitTests.returnDefaultValues = true
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation 'com.google.android.gms:play-services-auth:16.0.1'
+    testImplementation'junit:junit:4.12'
+    testImplementation 'org.mockito:mockito-core:2.17.0'
+}
--- a/example/android/app/google-services.json
+++ b/example/android/app/google-services.json
@ -0,0 +1,246 @@
+{
+  "project_info": {
+    "project_number": "479882132969",
+    "firebase_url": "https://my-flutter-proj.firebaseio.com",
+    "project_id": "my-flutter-proj",
+    "storage_bucket": "my-flutter-proj.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:479882132969:android:c73fd19ff7e2c0be",
+        "android_client_info": {
+          "package_name": "io.flutter.plugins.cameraexample"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCrZz9T0Pg0rDnpxfNuPBrOxGhXskfebXs"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 1,
+          "other_platform_oauth_client": []
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:479882132969:android:632cdf3fc0a17139",
+        "android_client_info": {
+          "package_name": "io.flutter.plugins.firebasedynamiclinksexample"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "479882132969-32qusitiag53931ck80h121ajhlc5a7e.apps.googleusercontent.com",
+          "client_type": 1,
+          "android_info": {
+            "package_name": "io.flutter.plugins.firebasedynamiclinksexample",
+            "certificate_hash": "e733b7a303250b63e06de6f7c9767c517d69cfa0"
+          }
+        },
+        {
+          "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCrZz9T0Pg0rDnpxfNuPBrOxGhXskfebXs"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 2,
+          "other_platform_oauth_client": [
+            {
+              "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+              "client_type": 3
+            },
+            {
+              "client_id": "479882132969-gjp4e63ogu2h6guttj2ie6t3f10ic7i8.apps.googleusercontent.com",
+              "client_type": 2,
+              "ios_info": {
+                "bundle_id": "io.flutter.plugins.firebaseMlVisionExample"
+              }
+            }
+          ]
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:479882132969:android:ae50362b4bc06086",
+        "android_client_info": {
+          "package_name": "io.flutter.plugins.firebasemlvisionexample"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "479882132969-9pp74fkgmtvt47t9rikc1p861v7n85tn.apps.googleusercontent.com",
+          "client_type": 1,
+          "android_info": {
+            "package_name": "io.flutter.plugins.firebasemlvisionexample",
+            "certificate_hash": "e733b7a303250b63e06de6f7c9767c517d69cfa0"
+          }
+        },
+        {
+          "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCrZz9T0Pg0rDnpxfNuPBrOxGhXskfebXs"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 2,
+          "other_platform_oauth_client": [
+            {
+              "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+              "client_type": 3
+            },
+            {
+              "client_id": "479882132969-gjp4e63ogu2h6guttj2ie6t3f10ic7i8.apps.googleusercontent.com",
+              "client_type": 2,
+              "ios_info": {
+                "bundle_id": "io.flutter.plugins.firebaseMlVisionExample"
+              }
+            }
+          ]
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:479882132969:android:215a22700e1b466b",
+        "android_client_info": {
+          "package_name": "io.flutter.plugins.firebaseperformanceexample"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "479882132969-8h4kiv8m7ho4tvn6uuujsfcrf69unuf7.apps.googleusercontent.com",
+          "client_type": 1,
+          "android_info": {
+            "package_name": "io.flutter.plugins.firebaseperformanceexample",
+            "certificate_hash": "e733b7a303250b63e06de6f7c9767c517d69cfa0"
+          }
+        },
+        {
+          "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCrZz9T0Pg0rDnpxfNuPBrOxGhXskfebXs"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 2,
+          "other_platform_oauth_client": [
+            {
+              "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+              "client_type": 3
+            },
+            {
+              "client_id": "479882132969-gjp4e63ogu2h6guttj2ie6t3f10ic7i8.apps.googleusercontent.com",
+              "client_type": 2,
+              "ios_info": {
+                "bundle_id": "io.flutter.plugins.firebaseMlVisionExample"
+              }
+            }
+          ]
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:479882132969:android:5e9f1f89e134dc86",
+        "android_client_info": {
+          "package_name": "io.flutter.plugins.googlesigninexample"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "479882132969-90ml692hkonp587sl0v0rurmnvkekgrg.apps.googleusercontent.com",
+          "client_type": 1,
+          "android_info": {
+            "package_name": "io.flutter.plugins.googlesigninexample",
+            "certificate_hash": "e733b7a303250b63e06de6f7c9767c517d69cfa0"
+          }
+        },
+        {
+          "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCrZz9T0Pg0rDnpxfNuPBrOxGhXskfebXs"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 2,
+          "other_platform_oauth_client": [
+            {
+              "client_id": "479882132969-0d20fkjtr1p8evfomfkf3vmi50uajml2.apps.googleusercontent.com",
+              "client_type": 3
+            },
+            {
+              "client_id": "479882132969-gjp4e63ogu2h6guttj2ie6t3f10ic7i8.apps.googleusercontent.com",
+              "client_type": 2,
+              "ios_info": {
+                "bundle_id": "io.flutter.plugins.firebaseMlVisionExample"
+              }
+            }
+          ]
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}
--- a/example/android/app/gradle/wrapper/gradle-wrapper.properties
+++ b/example/android/app/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@ -0,0 +1,25 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.flutter.plugins.googlesigninexample">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <application>
+        <activity android:name="io.flutter.embedding.android.FlutterActivity"
+                  android:theme="@android:style/Theme.Black.NoTitleBar"
+                  android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
+                  android:hardwareAccelerated="true"
+                  android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name=".EmbeddingV1Activity"
+                  android:theme="@android:style/Theme.Black.NoTitleBar"
+                  android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
+                  android:hardwareAccelerated="true"
+                  android:windowSoftInputMode="adjustResize">
+        </activity>
+        <meta-data android:name="flutterEmbedding" android:value="2"/>
+    </application>
+</manifest>
--- a/example/android/app/src/main/java/io/flutter/plugins/.gitignore
+++ b/example/android/app/src/main/java/io/flutter/plugins/.gitignore
@ -0,0 +1 @@
+GeneratedPluginRegistrant.java
--- a/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/EmbeddingV1Activity.java
+++ b/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/EmbeddingV1Activity.java
@ -0,0 +1,19 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.googlesigninexample;
+
+import android.os.Bundle;
+import io.flutter.app.FlutterActivity;
+import io.flutter.plugins.googlesignin.GoogleSignInPlugin;
+import io.flutter.view.FlutterMain;
+
+public class EmbeddingV1Activity extends FlutterActivity {
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    FlutterMain.startInitialization(this);
+    super.onCreate(savedInstanceState);
+    GoogleSignInPlugin.registerWith(registrarFor("io.flutter.plugins.googlesignin"));
+  }
+}
--- a/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/EmbeddingV1ActivityTest.java
+++ b/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/EmbeddingV1ActivityTest.java
@ -0,0 +1,17 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.googlesigninexample;
+
+import androidx.test.rule.ActivityTestRule;
+import dev.flutter.plugins.e2e.FlutterRunner;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+
+@RunWith(FlutterRunner.class)
+public class EmbeddingV1ActivityTest {
+  @Rule
+  public ActivityTestRule<EmbeddingV1Activity> rule =
+      new ActivityTestRule<>(EmbeddingV1Activity.class);
+}
--- a/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/FlutterActivityTest.java
+++ b/example/android/app/src/main/java/io/flutter/plugins/googlesigninexample/FlutterActivityTest.java
@ -0,0 +1,17 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.googlesigninexample;
+
+import androidx.test.rule.ActivityTestRule;
+import dev.flutter.plugins.e2e.FlutterRunner;
+import io.flutter.embedding.android.FlutterActivity;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+
+@RunWith(FlutterRunner.class)
+public class FlutterActivityTest {
+  @Rule
+  public ActivityTestRule<FlutterActivity> rule = new ActivityTestRule<>(FlutterActivity.class);
+}
--- a/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
+++ b/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
--- a/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
+++ b/example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
--- a/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
+++ b/example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
--- a/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
+++ b/example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
--- a/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
+++ b/example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
--- a/example/android/app/src/main/res/values/strings.xml
+++ b/example/android/app/src/main/res/values/strings.xml
@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="default_web_client_id">YOUR_WEB_CLIENT_ID</string>
+</resources>
--- a/example/android/build.gradle
+++ b/example/android/build.gradle
@ -0,0 +1,29 @@
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.3.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
--- a/example/android/gradle.properties
+++ b/example/android/gradle.properties
@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true
--- a/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/example/android/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip
--- a/example/android/settings.gradle
+++ b/example/android/settings.gradle
@ -0,0 +1,15 @@
+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withInputStream { stream -> plugins.load(stream) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}
--- a/example/ios/Flutter/AppFrameworkInfo.plist
+++ b/example/ios/Flutter/AppFrameworkInfo.plist
@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>UIRequiredDeviceCapabilities</key>
+  <array>
+    <string>arm64</string>
+  </array>
+  <key>MinimumOSVersion</key>
+  <string>8.0</string>
+</dict>
+</plist>
--- a/example/ios/Flutter/Debug.xcconfig
+++ b/example/ios/Flutter/Debug.xcconfig
@ -0,0 +1,2 @@
+#include "Generated.xcconfig"
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
--- a/example/ios/Flutter/Release.xcconfig
+++ b/example/ios/Flutter/Release.xcconfig
@ -0,0 +1,2 @@
+#include "Generated.xcconfig"
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
--- a/example/ios/GoogleSignInPluginTest/Info.plist
+++ b/example/ios/GoogleSignInPluginTest/Info.plist
@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
--- a/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@ -0,0 +1,502 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
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+		7ACDFB0E1E8944C400BE2D00 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 7ACDFB0D1E8944C400BE2D00 /* AppFrameworkInfo.plist */; };
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+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
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+/* End PBXBuildFile section */
+
+/* Begin PBXCopyFilesBuildPhase section */
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+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		0263E28FA425D1CE928BDE15 /* libPods-Runner.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libPods-Runner.a"; sourceTree = BUILT_PRODUCTS_DIR; };
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+		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
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+			buildActionMask = 2147483647;
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+			runOnlyForDeploymentPostprocessing = 0;
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+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		840012C8B5EDBCF56B0E4AC1 /* Pods */ = {
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+				F582639B44581540871D9BB0 /* Pods-Runner.release.xcconfig */,
+			);
+			name = Pods;
+			sourceTree = "<group>";
+		};
+		9740EEB11CF90186004384FC /* Flutter */ = {
+			isa = PBXGroup;
+			children = (
+				7ACDFB0D1E8944C400BE2D00 /* AppFrameworkInfo.plist */,
+				9740EEB21CF90195004384FC /* Debug.xcconfig */,
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+				9740EEB31CF90195004384FC /* Generated.xcconfig */,
+			);
+			name = Flutter;
+			sourceTree = "<group>";
+		};
+		97C146E51CF9000F007C117D = {
+			isa = PBXGroup;
+			children = (
+				9740EEB11CF90186004384FC /* Flutter */,
+				97C146F01CF9000F007C117D /* Runner */,
+				97C146EF1CF9000F007C117D /* Products */,
+				840012C8B5EDBCF56B0E4AC1 /* Pods */,
+				CF3B75C9A7D2FA2A4C99F110 /* Frameworks */,
+			);
+			sourceTree = "<group>";
+		};
+		97C146EF1CF9000F007C117D /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				97C146EE1CF9000F007C117D /* Runner.app */,
+			);
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+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
+				5C6F5A6C1EC3B4CB008D64B5 /* GeneratedPluginRegistrant.h */,
+				5C6F5A6D1EC3B4CB008D64B5 /* GeneratedPluginRegistrant.m */,
+				7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */,
+				7AFFD8EE1D35381100E5BB4D /* AppDelegate.m */,
+				97C146FA1CF9000F007C117D /* Main.storyboard */,
+				97C146FD1CF9000F007C117D /* Assets.xcassets */,
+				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
+				7A303C2D1E89D76400B1F19E /* GoogleService-Info.plist */,
+				97C147021CF9000F007C117D /* Info.plist */,
+				97C146F11CF9000F007C117D /* Supporting Files */,
+			);
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+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
+				97C146F21CF9000F007C117D /* main.m */,
+			);
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+			sourceTree = "<group>";
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+
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+		};
+/* End PBXShellScriptBuildPhase section */
+
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+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		97C147041CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		97C147061CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ENABLE_BITCODE = NO;
+				FRAMEWORK_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.plugins.googleSignInExample;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ENABLE_BITCODE = NO;
+				FRAMEWORK_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.plugins.googleSignInExample;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}
--- a/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
+++ b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1100"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/example/ios/Runner.xcworkspace/contents.xcworkspacedata
+++ b/example/ios/Runner.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/example/ios/Runner/AppDelegate.h
+++ b/example/ios/Runner/AppDelegate.h
@ -0,0 +1,10 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : FlutterAppDelegate
+
+@end
--- a/example/ios/Runner/AppDelegate.m
+++ b/example/ios/Runner/AppDelegate.m
@ -0,0 +1,17 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "AppDelegate.h"
+#include "GeneratedPluginRegistrant.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  [GeneratedPluginRegistrant registerWithRegistry:self];
+  // Override point for customization after application launch.
+  return [super application:application didFinishLaunchingWithOptions:launchOptions];
+}
+
+@end
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json
@ -0,0 +1,116 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@2x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@3x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@3x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@1x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@1x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@2x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@3x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@3x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@1x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@1x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@2x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@3x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@3x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@2x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@3x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@3x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@1x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@1x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@2x.png
--- a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png
+++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png
--- a/example/ios/Runner/Base.lproj/LaunchScreen.storyboard
+++ b/example/ios/Runner/Base.lproj/LaunchScreen.storyboard
@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
+                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
--- a/example/ios/Runner/Base.lproj/Main.storyboard
+++ b/example/ios/Runner/Base.lproj/Main.storyboard
@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>
--- a/example/ios/Runner/GoogleService-Info.plist
+++ b/example/ios/Runner/GoogleService-Info.plist
@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>AD_UNIT_ID_FOR_BANNER_TEST</key>
+	<string>ca-app-pub-3940256099942544/2934735716</string>
+	<key>AD_UNIT_ID_FOR_INTERSTITIAL_TEST</key>
+	<string>ca-app-pub-3940256099942544/4411468910</string>
+	<key>CLIENT_ID</key>
+	<string>479882132969-9i9aqik3jfjd7qhci1nqf0bm2g71rm1u.apps.googleusercontent.com</string>
+	<key>REVERSED_CLIENT_ID</key>
+	<string>com.googleusercontent.apps.479882132969-9i9aqik3jfjd7qhci1nqf0bm2g71rm1u</string>
+	<key>ANDROID_CLIENT_ID</key>
+	<string>479882132969-jie8r1me6dsra60pal6ejaj8dgme3tg0.apps.googleusercontent.com</string>
+	<key>API_KEY</key>
+	<string>AIzaSyBECOwLTAN6PU4Aet1b2QLGIb3kRK8Xjew</string>
+	<key>GCM_SENDER_ID</key>
+	<string>479882132969</string>
+	<key>PLIST_VERSION</key>
+	<string>1</string>
+	<key>BUNDLE_ID</key>
+	<string>io.flutter.plugins.googleSignInExample</string>
+	<key>PROJECT_ID</key>
+	<string>my-flutter-proj</string>
+	<key>STORAGE_BUCKET</key>
+	<string>my-flutter-proj.appspot.com</string>
+	<key>IS_ADS_ENABLED</key>
+	<true></true>
+	<key>IS_ANALYTICS_ENABLED</key>
+	<false></false>
+	<key>IS_APPINVITE_ENABLED</key>
+	<true></true>
+	<key>IS_GCM_ENABLED</key>
+	<true></true>
+	<key>IS_SIGNIN_ENABLED</key>
+	<true></true>
+	<key>GOOGLE_APP_ID</key>
+	<string>1:479882132969:ios:2643f950e0a0da08</string>
+	<key>DATABASE_URL</key>
+	<string>https://my-flutter-proj.firebaseio.com</string>
+	<key>SERVER_CLIENT_ID</key>
+	<string>YOUR_SERVER_CLIENT_ID</string>
+</dict>
+</plist>
--- a/example/ios/Runner/Info.plist
+++ b/example/ios/Runner/Info.plist
@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>Google Sign-In Example</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>GoogleSignInExample</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>com.googleusercontent.apps.479882132969-9i9aqik3jfjd7qhci1nqf0bm2g71rm1u</string>
+			</array>
+		</dict>
+	</array>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>arm64</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>
--- a/example/ios/Runner/main.m
+++ b/example/ios/Runner/main.m
@ -0,0 +1,13 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@ -0,0 +1,149 @@
+// Copyright 2019 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// ignore_for_file: public_member_api_docs
+
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:google_sign_in/google_sign_in.dart';
+
+import 'package:extension_google_sign_in_as_googleapis_auth/extension_google_sign_in_as_googleapis_auth.dart';
+import 'package:googleapis/people/v1.dart';
+
+GoogleSignIn _googleSignIn = GoogleSignIn(
+  scopes: <String>[
+    'email',
+    'https://www.googleapis.com/auth/contacts.readonly',
+  ],
+);
+
+void main() {
+  runApp(
+    MaterialApp(
+      title: 'Google Sign In',
+      home: SignInDemo(),
+    ),
+  );
+}
+
+class SignInDemo extends StatefulWidget {
+  @override
+  State createState() => SignInDemoState();
+}
+
+class SignInDemoState extends State<SignInDemo> {
+  GoogleSignInAccount _currentUser;
+  String _contactText;
+
+  @override
+  void initState() {
+    super.initState();
+    _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account) {
+      setState(() {
+        _currentUser = account;
+      });
+      if (_currentUser != null) {
+        _handleGetContact();
+      }
+    });
+    _googleSignIn.signInSilently();
+  }
+
+  Future<void> _handleGetContact() async {
+    setState(() {
+      _contactText = 'Loading contact info...';
+    });
+
+    final peopleApi = PeopleApi(await _googleSignIn.authenticatedClient());
+    final response = await peopleApi.people.connections.list(
+      'people/me',
+      personFields: 'names',
+    );
+
+    final firstNamedContactName = _pickFirstNamedContact(response.connections);
+
+    setState(() {
+      if (firstNamedContactName != null) {
+        _contactText = 'I see you know $firstNamedContactName!';
+      } else {
+        _contactText = 'No contacts to display.';
+      }
+    });
+  }
+
+  String _pickFirstNamedContact(List<Person> connections) {
+    return connections
+        ?.firstWhere(
+          (person) => person.names != null,
+          orElse: () => null,
+        )
+        ?.names
+        ?.firstWhere(
+          (name) => name.displayName != null,
+          orElse: () => null,
+        )
+        ?.displayName;
+  }
+
+  Future<void> _handleSignIn() async {
+    try {
+      await _googleSignIn.signIn();
+    } catch (error) {
+      print(error);
+    }
+  }
+
+  Future<void> _handleSignOut() => _googleSignIn.disconnect();
+
+  Widget _buildBody() {
+    if (_currentUser != null) {
+      return Column(
+        mainAxisAlignment: MainAxisAlignment.spaceAround,
+        children: <Widget>[
+          ListTile(
+            leading: GoogleUserCircleAvatar(
+              identity: _currentUser,
+            ),
+            title: Text(_currentUser.displayName ?? ''),
+            subtitle: Text(_currentUser.email ?? ''),
+          ),
+          const Text('Signed in successfully.'),
+          Text(_contactText ?? ''),
+          RaisedButton(
+            child: const Text('SIGN OUT'),
+            onPressed: _handleSignOut,
+          ),
+          RaisedButton(
+            child: const Text('REFRESH'),
+            onPressed: _handleGetContact,
+          ),
+        ],
+      );
+    } else {
+      return Column(
+        mainAxisAlignment: MainAxisAlignment.spaceAround,
+        children: <Widget>[
+          const Text('You are not currently signed in.'),
+          RaisedButton(
+            child: const Text('SIGN IN'),
+            onPressed: _handleSignIn,
+          ),
+        ],
+      );
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: const Text('Google Sign In'),
+        ),
+        body: ConstrainedBox(
+          constraints: const BoxConstraints.expand(),
+          child: _buildBody(),
+        ));
+  }
+}
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@ -0,0 +1,23 @@
+name: extension_google_sign_in_example
+description: Example of Google Sign-In plugin and googleapis.
+
+dependencies:
+  flutter:
+    sdk: flutter
+  google_sign_in: ^4.4.1
+  extension_google_sign_in_as_googleapis_auth:
+    path: ../
+  googleapis: ^0.55.0
+
+dev_dependencies:
+  pedantic: ^1.8.0
+  e2e:  ^0.2.1
+  flutter_driver:
+    sdk: flutter
+
+flutter:
+  uses-material-design: true
+
+environment:
+  sdk: ">=2.0.0-dev.28.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.4 <2.0.0"
--- a/example/web/index.html
+++ b/example/web/index.html
@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <meta name="google-signin-client_id" content="[YOUR_OAUTH_2_CLIENT_ID_FOR_WEB]" />
+  <title>Google Sign-in Example</title>
+</head>
+<body>
+  <script src="main.dart.js" type="application/javascript"></script>
+</body>
+</html>
--- a/lib/extension_google_sign_in_as_googleapis_auth.dart
+++ b/lib/extension_google_sign_in_as_googleapis_auth.dart
@ -0,0 +1,36 @@
+// Copyright 2020 The Flutter Authors
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+import 'package:meta/meta.dart';
+import 'package:google_sign_in/google_sign_in.dart';
+import 'package:googleapis_auth/auth.dart' as googleapis_auth;
+import 'package:http/http.dart' as http;
+
+/// Extension on [GoogleSignIn] that adds an `authenticatedClient` method.
+///
+/// This method can be used to retrieve an authenticated [googleapis_auth.AuthClient]
+/// client that can be used with the rest of the `googleapis` libraries.
+extension GoogleApisGoogleSignInAuth on GoogleSignIn {
+  /// Retrieve a `googleapis` authenticated client.
+  Future<googleapis_auth.AuthClient> authenticatedClient({
+    @visibleForTesting GoogleSignInAuthentication debugAuthentication,
+    @visibleForTesting List<String> debugScopes = const [],
+  }) async {
+    final auth = debugAuthentication ?? await currentUser.authentication;
+    final credentials = googleapis_auth.AccessCredentials(
+      googleapis_auth.AccessToken(
+        'Bearer',
+        auth.accessToken,
+        // We don't know when the token expires, so we assume "never"
+        DateTime.now().toUtc().add(Duration(days: 365)),
+      ),
+      null, // We don't have a refreshToken
+      debugScopes ?? this.scopes,
+    );
+
+    return googleapis_auth.authenticatedClient(http.Client(), credentials);
+  }
+}
--- a/pubspec.yaml
+++ b/pubspec.yaml
@ -0,0 +1,28 @@
+# Copyright 2020 The Flutter Authors
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+name: extension_google_sign_in_as_googleapis_auth
+description: A bridge package between google_sign_in and googleapis_auth, to create Authenticated Clients from google_sign_in user credentials.
+version: 1.0.0
+homepage: https://github.com/flutter/plugins/google_sign_in/extension_google_sign_in_as_googleapis_auth
+
+dependencies:
+  flutter:
+    sdk: flutter
+  google_sign_in: ^4.4.1
+  googleapis_auth: ^0.2.11+1
+  meta: ^1.1.8
+  http: ^0.12.1
+
+dev_dependencies:
+  mockito: ^4.1.1
+  pedantic: ^1.9.0
+  flutter_test:
+    sdk: flutter
+
+environment:
+  sdk: ">=2.7.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.4 <2.0.0"
--- a/test/extension_google_sign_in_as_googleapis_auth_test.dart
+++ b/test/extension_google_sign_in_as_googleapis_auth_test.dart
@ -0,0 +1,46 @@
+// Copyright 2020 The Flutter Authors
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+import 'package:google_sign_in/google_sign_in.dart';
+import 'package:googleapis_auth/auth.dart' as auth;
+import 'package:extension_google_sign_in_as_googleapis_auth/extension_google_sign_in_as_googleapis_auth.dart';
+import 'package:mockito/mockito.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+// Mocks so I don't have to prepare all the GoogleSignIn environment.
+class MockGoogleSignIn extends Mock implements GoogleSignIn {}
+
+class MockGoogleSignInAuthentication extends Mock
+    implements GoogleSignInAuthentication {}
+
+const SOME_FAKE_ACCESS_TOKEN = 'this-is-something-not-null';
+const SOME_FAKE_SCOPES = ['some-scope', 'another-scope'];
+
+void main() {
+  GoogleSignIn signIn = MockGoogleSignIn();
+  final authMock = MockGoogleSignInAuthentication();
+
+  setUp(() {
+    when(authMock.accessToken).thenReturn(SOME_FAKE_ACCESS_TOKEN);
+  });
+
+  test('authenticatedClient returns an authenticated client', () async {
+    final client = await signIn.authenticatedClient(
+      debugAuthentication: authMock,
+    );
+    expect(client, isA<auth.AuthClient>());
+  });
+
+  test('authenticatedClient returned client contains the passed-in credentials',
+      () async {
+    final client = await signIn.authenticatedClient(
+      debugAuthentication: authMock,
+      debugScopes: SOME_FAKE_SCOPES,
+    );
+    expect(client.credentials.accessToken.data, equals(SOME_FAKE_ACCESS_TOKEN));
+    expect(client.credentials.scopes, equals(SOME_FAKE_SCOPES));
+  });
+}