SignIn with Apple

10min
Flutter Sign In with Apple on Parse
Introduction
Parse Server supports 3rd party authentication.
In this guide, you will learn how to support Sign In with Apple to your Flutter app on Parse.
Prerequisites
To complete this tutorial, you will need:
﻿Flutter version 2.2.x or later﻿
﻿Android Studio or VS Code installed (with Plugins Dart and Flutter)
A Flutter app created and connected to Back4App.
Note: Follow the New Parse App Tutorial to learn how to create a Parse App on Back4App.
Paid membership to the Apple Developer Program.
Set up the plugin sign_in_with_apple on project.
A device (not Simulator) running iOS.
Goal
Sign in with Apple in Flutter app on Parse Server
- Add the Sign In with Apple capability to your iOS base project
Openios/Runner.xcworkspacein Xcode
Check the pluginsign_in_with_apple instructions for setting up Sign in with Apple in your iOS project
SelectTeamfor project.
Save e close Xcode
- Configure App ID in Developer Portal
Log into your Apple Developer account and go to the Identifiers section.
Check if your created Bundle Identifier is there
﻿
Click the Bundle Identifier and scroll down. Check if the Sign In with Apple is selected
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Click Edit and make sure the Enable as a primary App ID is selected
﻿
If everything is right, save and exit.
- Set up Parse Auth for Apple
Go to Back4App website, log in and then find your app. After that, click on Server Settings and search for the Apple Login block and select Settings.
The Apple Login section looks like this:
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Now, you just need to paste your Bundle ID in the field below and click on the button to save.
﻿
In case you face any trouble while integrating Apple Login, please contact our team via chat!
- Add the Sign In with Apple
Now that you have the project set up, we can get the user data and sign in to Parse.
According to the documentation, we must send a Map with user authentication data.
Swift
       final credential = await SignInWithApple.getAppleIDCredential(
         scopes: [
           AppleIDAuthorizationScopes.email,
           AppleIDAuthorizationScopes.fullName,
         ],
       );

       //https://docs.parseplatform.org/parse-server/guide/#apple-authdata
       //According to the documentation, we must send a Map with user authentication data.
      //Make sign in with Apple
      final parseResponse = await ParseUser.loginWith('apple',
          apple(credential.identityToken!, credential.userIdentifier!));
       final credential = await SignInWithApple.getAppleIDCredential(
         scopes: [
           AppleIDAuthorizationScopes.email,
           AppleIDAuthorizationScopes.fullName,
         ],
       );

       //https://docs.parseplatform.org/parse-server/guide/#apple-authdata
       //According to the documentation, we must send a Map with user authentication data.
      //Make sign in with Apple
      final parseResponse = await ParseUser.loginWith('apple',
          apple(credential.identityToken!, credential.userIdentifier!));
﻿
- Sign in with Apple from Flutter
Let’s now use our example for Sign in with Apple in Flutter App, with a simple interface.
Open your Flutter project, go to the main.dart file, clean up all the code, and replace it with:
Dart
 import 'package:flutter/material.dart';
 import 'package:parse_server_sdk_flutter/parse_server_sdk.dart';
 import 'package:sign_in_with_apple/sign_in_with_apple.dart';
4
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
7
   final keyApplicationId = 'YOUR_APP_ID_HERE';
   final keyClientKey = 'YOUR_CLIENT_KEY_HERE';
  final keyParseServerUrl = 'https://parseapi.back4app.com';
11
  await Parse().initialize(keyApplicationId, keyParseServerUrl,
      clientKey: keyClientKey, debug: true);
14
  runApp(MyApp());
}
17
class MyApp extends StatelessWidget {
  Future<bool> hasUserLogged() async {
    ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
    if (currentUser == null) {
      return false;
    }
    //Checks whether the user's session token is valid
    final ParseResponse? parseResponse =
        await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);

    if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter - Sign In with Apple',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: FutureBuilder<bool>(
          future: hasUserLogged(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Scaffold(
                  body: Center(
                    child: Container(
                        width: 100,
                        height: 100,
                        child: CircularProgressIndicator()),
                  ),
                );
              default:
                if (snapshot.hasData && snapshot.data!) {
                  return UserPage();
                } else {
                  return HomePage();
                }
            }
          }),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}
75
class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Flutter - Sign In with Apple'),
        ),
        body: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(8),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Container(
                  height: 200,
                  child: Image.network(
                      'http://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
                ),
                Center(
                  child: const Text('Flutter on Back4App',
                      style:
                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                ),
                SizedBox(
                 height: 100,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Sign In with Apple'),
                   onPressed: () => doSignInApple(),
                 ),
               ),
               SizedBox(
                 height: 16,
               ),
             ],
           ),
         ),
       ));
 }

 void doSignInApple() async {
   late ParseResponse parseResponse;
   try {
     //Set Scope
     final credential = await SignInWithApple.getAppleIDCredential(
       scopes: [
         AppleIDAuthorizationScopes.email,
         AppleIDAuthorizationScopes.fullName,
       ],
     );
128
     //https://docs.parseplatform.org/parse-server/guide/#apple-authdata
     //According to the documentation, we must send a Map with user authentication data.
     //Make sign in with Apple
     parseResponse = await ParseUser.loginWith('apple',
         apple(credential.identityToken!, credential.userIdentifier!));

     if (parseResponse.success) {
       final ParseUser parseUser = await ParseUser.currentUser() as ParseUser;

       //Additional Information in User
       if (credential.email != null) {
         parseUser.emailAddress = credential.email;
       }
       if (credential.givenName != null && credential.familyName != null) {
         parseUser.set<String>(
             'name', '${credential.givenName} ${credential.familyName}');
       }
       parseResponse = await parseUser.save();
       if (parseResponse.success) {
         Message.showSuccess(
             context: context,
             message: 'User was successfully with Sign In Apple!',
             onPressed: () async {
               Navigator.pushAndRemoveUntil(
                 context,
                 MaterialPageRoute(builder: (context) => UserPage()),
                 (Route<dynamic> route) => false,
               );
             });
       } else {
         Message.showError(
             context: context, message: parseResponse.error!.message);
       }
     } else {
       Message.showError(
           context: context, message: parseResponse.error!.message);
     }
   } on Exception catch (e) {
     print(e.toString());
     Message.showError(context: context, message: e.toString());
   }
 }
}
172
class UserPage extends StatelessWidget {
 Future<ParseUser?> getUser() async {
   return await ParseUser.currentUser() as ParseUser?;
 }
177
 @override
 Widget build(BuildContext context) {
   void doUserLogout() async {
     final currentUser = await ParseUser.currentUser() as ParseUser;
     var response = await currentUser.logout();
     if (response.success) {
       Message.showSuccess(
           context: context,
           message: 'User was successfully logout!',
           onPressed: () {
             Navigator.pushAndRemoveUntil(
               context,
               MaterialPageRoute(builder: (context) => HomePage()),
               (Route<dynamic> route) => false,
             );
           });
     } else {
       Message.showError(context: context, message: response.error!.message);
     }
   }

   return Scaffold(
       appBar: AppBar(
         title: Text('Flutter - Sign In with Apple'),
       ),
       body: FutureBuilder<ParseUser?>(
           future: getUser(),
           builder: (context, snapshot) {
             switch (snapshot.connectionState) {
               case ConnectionState.none:
               case ConnectionState.waiting:
                 return Center(
                   child: Container(
                       width: 100,
                       height: 100,
                       child: CircularProgressIndicator()),
                 );
               default:
                 return Padding(
                   padding: const EdgeInsets.all(8.0),
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.stretch,
                     mainAxisAlignment: MainAxisAlignment.center,
                     children: [
                       Center(
                           child: Text(
                               'Hello, ${snapshot.data!.get<String>('name')}')),
                       SizedBox(
                         height: 16,
                       ),
                       Container(
                         height: 50,
                         child: ElevatedButton(
                           child: const Text('Logout'),
                           onPressed: () => doUserLogout(),
                         ),
                       ),
                     ],
                   ),
                 );
             }
           }));
 }
}

class Message {
 static void showSuccess(
     {required BuildContext context,
     required String message,
     VoidCallback? onPressed}) {
   showDialog(
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
         title: const Text("Success!"),
         content: Text(message),
         actions: <Widget>[
           new ElevatedButton(
             child: const Text("OK"),
             onPressed: () {
               Navigator.of(context).pop();
               if (onPressed != null) {
                 onPressed();
               }
             },
           ),
         ],
       );
     },
   );
 }

 static void showError(
     {required BuildContext context,
     required String message,
     VoidCallback? onPressed}) {
   showDialog(
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
         title: const Text("Error!"),
         content: Text(message),
         actions: <Widget>[
           new ElevatedButton(
             child: const Text("OK"),
             onPressed: () {
               Navigator.of(context).pop();
               if (onPressed != null) {
                 onPressed();
               }
             },
           ),
         ],
       );
     },
   );
 }
}
 import 'package:flutter/material.dart';
 import 'package:parse_server_sdk_flutter/parse_server_sdk.dart';
 import 'package:sign_in_with_apple/sign_in_with_apple.dart';
4
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
7
   final keyApplicationId = 'YOUR_APP_ID_HERE';
   final keyClientKey = 'YOUR_CLIENT_KEY_HERE';
  final keyParseServerUrl = 'https://parseapi.back4app.com';
11
  await Parse().initialize(keyApplicationId, keyParseServerUrl,
      clientKey: keyClientKey, debug: true);
14
  runApp(MyApp());
}
17
class MyApp extends StatelessWidget {
  Future<bool> hasUserLogged() async {
    ParseUser? currentUser = await ParseUser.currentUser() as ParseUser?;
    if (currentUser == null) {
      return false;
    }
    //Checks whether the user's session token is valid
    final ParseResponse? parseResponse =
        await ParseUser.getCurrentUserFromServer(currentUser.sessionToken!);

    if (parseResponse?.success == null || !parseResponse!.success) {
      //Invalid session. Logout
      await currentUser.logout();
      return false;
    } else {
      return true;
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter - Sign In with Apple',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: FutureBuilder<bool>(
          future: hasUserLogged(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
              case ConnectionState.waiting:
                return Scaffold(
                  body: Center(
                    child: Container(
                        width: 100,
                        height: 100,
                        child: CircularProgressIndicator()),
                  ),
                );
              default:
                if (snapshot.hasData && snapshot.data!) {
                  return UserPage();
                } else {
                  return HomePage();
                }
            }
          }),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}
75
class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Flutter - Sign In with Apple'),
        ),
        body: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(8),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Container(
                  height: 200,
                  child: Image.network(
                      'http://blog.back4app.com/wp-content/uploads/2017/11/logo-b4a-1-768x175-1.png'),
                ),
                Center(
                  child: const Text('Flutter on Back4App',
                      style:
                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                ),
                SizedBox(
                 height: 100,
               ),
               Container(
                 height: 50,
                 child: ElevatedButton(
                   child: const Text('Sign In with Apple'),
                   onPressed: () => doSignInApple(),
                 ),
               ),
               SizedBox(
                 height: 16,
               ),
             ],
           ),
         ),
       ));
 }

 void doSignInApple() async {
   late ParseResponse parseResponse;
   try {
     //Set Scope
     final credential = await SignInWithApple.getAppleIDCredential(
       scopes: [
         AppleIDAuthorizationScopes.email,
         AppleIDAuthorizationScopes.fullName,
       ],
     );
128
     //https://docs.parseplatform.org/parse-server/guide/#apple-authdata
     //According to the documentation, we must send a Map with user authentication data.
     //Make sign in with Apple
     parseResponse = await ParseUser.loginWith('apple',
         apple(credential.identityToken!, credential.userIdentifier!));

     if (parseResponse.success) {
       final ParseUser parseUser = await ParseUser.currentUser() as ParseUser;

       //Additional Information in User
       if (credential.email != null) {
         parseUser.emailAddress = credential.email;
       }
       if (credential.givenName != null && credential.familyName != null) {
         parseUser.set<String>(
             'name', '${credential.givenName} ${credential.familyName}');
       }
       parseResponse = await parseUser.save();
       if (parseResponse.success) {
         Message.showSuccess(
             context: context,
             message: 'User was successfully with Sign In Apple!',
             onPressed: () async {
               Navigator.pushAndRemoveUntil(
                 context,
                 MaterialPageRoute(builder: (context) => UserPage()),
                 (Route<dynamic> route) => false,
               );
             });
       } else {
         Message.showError(
             context: context, message: parseResponse.error!.message);
       }
     } else {
       Message.showError(
           context: context, message: parseResponse.error!.message);
     }
   } on Exception catch (e) {
     print(e.toString());
     Message.showError(context: context, message: e.toString());
   }
 }
}
172
class UserPage extends StatelessWidget {
 Future<ParseUser?> getUser() async {
   return await ParseUser.currentUser() as ParseUser?;
 }
177
 @override
 Widget build(BuildContext context) {
   void doUserLogout() async {
     final currentUser = await ParseUser.currentUser() as ParseUser;
     var response = await currentUser.logout();
     if (response.success) {
       Message.showSuccess(
           context: context,
           message: 'User was successfully logout!',
           onPressed: () {
             Navigator.pushAndRemoveUntil(
               context,
               MaterialPageRoute(builder: (context) => HomePage()),
               (Route<dynamic> route) => false,
             );
           });
     } else {
       Message.showError(context: context, message: response.error!.message);
     }
   }

   return Scaffold(
       appBar: AppBar(
         title: Text('Flutter - Sign In with Apple'),
       ),
       body: FutureBuilder<ParseUser?>(
           future: getUser(),
           builder: (context, snapshot) {
             switch (snapshot.connectionState) {
               case ConnectionState.none:
               case ConnectionState.waiting:
                 return Center(
                   child: Container(
                       width: 100,
                       height: 100,
                       child: CircularProgressIndicator()),
                 );
               default:
                 return Padding(
                   padding: const EdgeInsets.all(8.0),
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.stretch,
                     mainAxisAlignment: MainAxisAlignment.center,
                     children: [
                       Center(
                           child: Text(
                               'Hello, ${snapshot.data!.get<String>('name')}')),
                       SizedBox(
                         height: 16,
                       ),
                       Container(
                         height: 50,
                         child: ElevatedButton(
                           child: const Text('Logout'),
                           onPressed: () => doUserLogout(),
                         ),
                       ),
                     ],
                   ),
                 );
             }
           }));
 }
}

class Message {
 static void showSuccess(
     {required BuildContext context,
     required String message,
     VoidCallback? onPressed}) {
   showDialog(
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
         title: const Text("Success!"),
         content: Text(message),
         actions: <Widget>[
           new ElevatedButton(
             child: const Text("OK"),
             onPressed: () {
               Navigator.of(context).pop();
               if (onPressed != null) {
                 onPressed();
               }
             },
           ),
         ],
       );
     },
   );
 }

 static void showError(
     {required BuildContext context,
     required String message,
     VoidCallback? onPressed}) {
   showDialog(
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
         title: const Text("Error!"),
         content: Text(message),
         actions: <Widget>[
           new ElevatedButton(
             child: const Text("OK"),
             onPressed: () {
               Navigator.of(context).pop();
               if (onPressed != null) {
                 onPressed();
               }
             },
           ),
         ],
       );
     },
   );
 }
}
﻿
Find your Application Id and Client Key credentials navigating to your app Dashboard at Back4App Website.
Update your code in main.dart with the values of your project’s ApplicationId and ClientKey in Back4app.
keyApplicationId = App Id﻿
keyClientKey = Client Key﻿
Run the project, and the app will load as shown in the image.
﻿
Conclusion
At this stage, you are able to use Sign in with Apple in Flutter on Back4app.