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Flutter quickstart

This guide is a walkthrough on how to integrate Frontegg’s authentication magic into your app using the Frontegg Flutter SDK. Whether you need to add secure sign-ups, logins, multi-factor authentication, or even social logins, this guide has you covered with simple, step-by-step instructions to get things rolling in no time.

Check out the sample package on GitHub


Or the package on pub.dev


Prerequisites

Frontegg Hosted Login is required, and setting a custom domain is highly recommended.
iOS ≥ 14
Android ≥ 26


Prepare your Frontegg workspace

Navigate to Frontegg Portal Settings, If you don't have application
follow the integration steps after signing up. Copy FronteggDomain to future steps from Frontegg Portal Domain


frontegg-domain

  • Navigate to Login Method Settings
  • Toggle on Hosted login method for iOS:
    • Add {{IOS_BUNDLE_IDENTIFIER}}://{{FRONTEGG_BASE_URL}}/ios/oauth/callback
  • Toggle Hosted login method for Android:
    • Add {{ANDROID_PACKAGE_NAME}}://{{FRONTEGG_BASE_URL}}/android/oauth/callback
    • Add https://{{FRONTEGG_BASE_URL}}/oauth/account/redirect/android/{{ANDROID_PACKAGE_NAME}}
  • Replace IOS_BUNDLE_IDENTIFIER with your application identifier
  • Replace FRONTEGG_BASE_URL with your Frontegg base url, without https, i.e FronteggDomain.
  • Replace ANDROID_PACKAGE_NAME with your android package name

Add Frontegg package to the project

dart pub add frontegg_flutter

Or manually:


dependencies:
  frontegg_flutter: ^1.0.0

Setup iOS project

To setup your SwiftUI application to communicate with Frontegg, you have to create a new file named Frontegg.plist
under your root project directory, this file will store values to be used variables by Frontegg SDK:

<?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>baseUrl</key>
        <string>https://[DOMAIN_HOST_FROM_PREVIOUS_STEP]</string>
        <key>clientId</key>
        <string>[CLIENT_ID_FROM_PREVIOUS_STEP]</string>
    </dict>
</plist>

Multi-apps iOS support

Prerequisites

The use of this feature requires @frontegg/flutter@1.0.1


This guide outlines the steps to configure your iOS application to support multiple applications.

Modify the Frontegg.plist file and add applicationId to Frontegg.plist file:

<plist version="1.0">
  <dict>
    <key>applicationId</key>  
    <string>your-application-id-uuid</string>
    <key>baseUrl</key>
    <string>https://your-domain.fronteg.com</string>
    <key>clientId</key>
    <string>your-client-id-uuid</string>
  </dict>
</plist>

Handle open app with URL

To handle Login with magic link and other authentication methods that require to open the app with a URL, you have to add the following code to.

For Objective-C
  1. Create FronteggSwiftAdapter.swift in your project and add the following code:
//  FronteggSwiftAdapter.swift

   import Foundation
   import FronteggSwift

   @objc(FronteggSwiftAdapter)
   public class FronteggSwiftAdapter: NSObject {
       @objc public static let shared = FronteggSwiftAdapter()

       @objc public func handleOpenUrl(_ url: URL) -> Bool {
           return FronteggAuth.shared.handleOpenUrl(url)
       }
   }

  1. Open AppDelegate.m file and import swift headers:
#import <[YOUR_PROJECT_NAME]-Swift.h>

  1. Add URL handlers to AppDelegate.m:
#import <[YOUR_PROJECT_NAME]-Swift.h>

   // ...CODE...

   - (BOOL)application:(UIApplication *)app openURL:(NSURL *)url
           options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options
   {
     
     if([[FronteggSwiftAdapter shared] handleOpenUrl:url] ){
       return TRUE;
     }
     return [RCTLinkingManager application:app openURL:url options:options];
   }

   - (BOOL)application:(UIApplication *)application continueUserActivity:(nonnull NSUserActivity *)userActivity
    restorationHandler:(nonnull void (^)(NSArray<id<UIUserActivityRestoring>> * _Nullable))restorationHandler
   {
     
     if (userActivity.webpageURL != NULL){
       if([[FronteggSwiftAdapter shared] handleOpenUrl:userActivity.webpageURL] ){
         return TRUE;
       }
     }
    return [RCTLinkingManager application:application
                     continueUserActivity:userActivity
                       restorationHandler:restorationHandler];
   }
For Swift
  1. Open AppDelegate.m file and import swift headers:
import FronteggSwift

  1. Add URL handlers to AppDelegate.swift:

import UIKit
   import FronteggSwift

   @UIApplicationMain
   class AppDelegate: UIResponder, UIApplicationDelegate {

       /*
        * Called when the app was launched with a url. Feel free to add additional processing here,
        * but if you want the App API to support tracking app url opens, make sure to keep this call
        */
       func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
           
           if(FronteggAuth.shared.handleOpenUrl(url, true)){
               return true
           }
           
           return ApplicationDelegateProxy.shared.application(app, open: url, options: options)
       }
       
       /*
        * Called when the app was launched with an activity, including Universal Links.
        * Feel free to add additional processing here, but if you want the App API to support
        * tracking app url opens, make sure to keep this call
        */
       func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
           
           if let url = userActivity.webpageURL {
               if(FronteggAuth.shared.handleOpenUrl(url, true)){
                   return true
               }
           }
           return ApplicationDelegateProxy.shared.application(application, continue: userActivity, restorationHandler: restorationHandler)
       }
   }

Configure iOS associated domain

Configuring your iOS associated domain is required for Magic Link authentication / Reset Password / Activate Account.

  1. In order to add your iOS associated domain to your Frontegg application, you will need to update in each of your
    integrated Frontegg Environments the iOS associated domain that you would like to use with that Environment. Send a POST request to https://api.frontegg.com/vendors/resources/associated-domains/v1/ios with the following payload:
{
    "appId":[YOUR_ASSOCIATED_DOMAIN]
}

In order to use our API’s, follow this guide to generate a vendor token.

  1. Next, you will need to add your associated domain to your iOS application. To do so, follow the steps below:

    • Open your project in Xcode.
    • Select your project in the Project Navigator.
    • Select your target.
    • Select the Signing & Capabilities tab.
    • Expand the Associated Domains section.
    • Click the + button.
    • Enter your associated domain in the format applinks:[YOUR_ASSOCIATED_DOMAIN].
    • Enter your associated domain in the format webcredentials:[YOUR_ASSOCIATED_DOMAIN].
    • Click Done.

[YOUR_ASSOCIATED_DOMAIN] is the associated domain that you would like to use with your iOS application.
For example, if you would like to use https://example.com as your associated domain, you would enter applinks:example.com and webcredentials:example.com.

Setup Android project

To set up your Android minimum sdk version, open root gradle file atandroid/build.gradle, and add/edit the minSdkVersion under buildscript.ext:

buildscript {
    ext {
        minSdkVersion = 26
        // ...
    }
}

Configure build config fields

To set up your Android application on to communicate with Frontegg, you have to add buildConfigField property the
gradle android/app/build.gradle. This property will store frontegg hostname (without https) and client id from previous step:

def fronteggDomain = "FRONTEGG_DOMAIN_HOST.com" // without protocol https://
def fronteggClientId = "FRONTEGG_CLIENT_ID"

android {
    defaultConfig {

        manifestPlaceholders = [
                "package_name" : applicationId,
                "frontegg_domain" : fronteggDomain,
                "frontegg_client_id": fronteggClientId
        ]

        buildConfigField "String", 'FRONTEGG_DOMAIN', "\"$fronteggDomain\""
        buildConfigField "String", 'FRONTEGG_CLIENT_ID', "\"$fronteggClientId\""
        buildConfigField "Boolean", 'FRONTEGG_USE_ASSETS_LINKS', "true" /** For using frontegg domain for deeplinks **/
        buildConfigField "Boolean", 'FRONTEGG_USE_CHROME_CUSTOM_TABS', "true"  /** For using custom chrome tab for social-logins **/
    }
}

NOTE:

FRONTEGG_USE_ASSETS_LINKS by default is true.
FRONTEGG_USE_CHROME_CUSTOM_TABS by default is true.

So, if you do not set up those values we will use the default ones.

Add bundleConfig=true if it does not exist inside the android section inside the app gradle android/app/build.gradle

android {
  buildFeatures {
    buildConfig = true
  }
}

Add permissions to AndroidManifest.xml

Add INTERNET permission to the app's manifest file.


<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>

Configuring your Android AssetLinks is required for Magic Link authentication / Reset Password / Activate Account /
login with IdPs.


To add your AssetLinks to your Frontegg application, you will need to update in each of your integrated Frontegg
Environments the AssetLinks that you would like to use with that Environment. Send a POST request to https://api.frontegg.com/vendors/resources/associated-domains/v1/android with the following payload:

{
    "packageName": "YOUR_APPLICATION_PACKAGE_NAME",
    "sha256CertFingerprints": ["YOUR_KEYSTORE_CERT_FINGERPRINTS"]
}

Each Android app has multiple certificate fingerprint, to get your DEBUG sha256CertFingerprint you have to run the
below command. For Debug mode, run the following command and copy the SHA-256 value.

NOTE: make sure to choose the Variant and Config equals to debug

./gradlew signingReport

###################
#  Example Output:
###################

#  Variant: debug
#  Config: debug
#  Store: /Users/davidfrontegg/.android/debug.keystore
#  Alias: AndroidDebugKey
#  MD5: 25:F5:99:23:FC:12:CA:10:8C:43:F4:02:7D:AD:DC:B6
#  SHA1: FC:3C:88:D6:BF:4E:62:2E:F0:24:1D:DB:D7:15:36:D6:3E:14:84:50
#  SHA-256: D9:6B:4A:FD:62:45:81:65:98:4D:5C:8C:A0:68:7B:7B:A5:31:BD:2B:9B:48:D9:CF:20:AE:56:FD:90:C1:C5:EE
#  Valid until: Tuesday, 18 June 2052

For Release mode, Extract the SHA256 using keytool from your Release keystore file:


keytool -list -v -keystore /PATH/file.jks -alias YourAlias -storepass *** -keypass ***

Enabling chrome custom tabs for social login

To enable social login using Chrome Custom Tabs within your Android application, you need to modify the android/app/build.gradle file. Add a boolean buildConfigField for the FRONTEGG_USE_CHROME_CUSTOM_TABS flag and set it to true. By default, the SDK defaults to using the Chrome browser for social login.

def fronteggDomain = "FRONTEGG_DOMAIN_HOST.com" // without protocol https://
def fronteggClientId = "FRONTEGG_CLIENT_ID"

android {
   defaultConfig {

       manifestPlaceholders = [
               "package_name" : applicationId,
               "frontegg_domain" : fronteggDomain,
               "frontegg_client_id": fronteggClientId
       ]

       buildConfigField "String", 'FRONTEGG_DOMAIN', "\"$fronteggDomain\""
       buildConfigField "String", 'FRONTEGG_CLIENT_ID', "\"$fronteggClientId\""
       
       buildConfigField "Boolean", 'FRONTEGG_USE_CHROME_CUSTOM_TABS', "true"
   }
   
   
}

Multi-apps Android support

Prerequisites

The use of this feature requires minimum @frontegg/flutter@1.0.1


Modify the Build.gradle file and add FRONTEGG_APPLICATION_ID buildConfigField into the build.gradle file:

def fronteggApplicationId = "your-application-id-uuid"
...
android {
    ...
    buildConfigField "String", 'FRONTEGG_APPLICATION_ID', "\"$fronteggApplicationId\""
}

Wrap your root widget with FronteggProvider

import 'package:flutter/material.dart';
import 'package:frontegg_flutter/frontegg_flutter.dart';

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: FronteggProvider(
        child: const MainPage(),
      ),
    );
  }
}

Or use Provider from the plugin or other suitable plugin. Make sure to dispose of the FronteggFlutter:

import 'package:flutter/material.dart';
import 'package:frontegg_flutter/frontegg_flutter.dart';
import 'package:provider/provider.dart';

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Provider(
        create: (_) => FronteggFlutter(),
        dispose: (_, frontegg) => frontegg.dispose(),
        child: const MainPage(),
      ),
    );
  }
}

Access the Frontegg instance

To get the FronteggFlutter instance use the Frontegg BuildContext extension down the widget tree:

class MainPage extends StatelessWidget {
  const MainPage({super.key});

  @override
  Widget build(BuildContext context) {
    final frontegg = context.frontegg;
    return const SizedBox();
  }
}

Login with Frontegg

To login with Frontegg you can use the context.frontegg accessor and call login method:

class MainPage extends StatelessWidget {
  const MainPage({super.key});

  @override
  Widget build(BuildContext context) {
    final frontegg = context.frontegg;
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          child: const Text("Login"),
          onPressed: () async {
            await frontegg.login();
          },
        ),
      ),
    );
  }
}

Switch user's tenant

To switch a user's tenant you can use the context.frontegg accessor and call switchTenant method:

class MainPage extends StatelessWidget {
  const MainPage({super.key});

  @override
  Widget build(BuildContext context) {
    final frontegg = context.frontegg;
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          child: const Text("Login"),
          onPressed: () async {
            final tenantId = "TENANT_ID";
            await frontegg.switchTenant(tenantId);
          },
        ),
      ),
    );
  }
}

Frontegg state

FronteggPlugin has a FronteggState and this state is changing according to the plugin flowing: 

class FronteggState {
  final String? accessToken;
  final String? refreshToken;
  final FronteggUser? user;
  final bool isAuthenticated;
  final bool isLoading;
  final bool initializing;
  final bool showLoader;
  final bool appLink;
}

To get the state of the FronteggFlutter you have two options:

  1. Get currentState:
@override
    Widget build(BuildContext context) {
      final frontegg = context.frontegg;
      final fronteggState = frontegg.currentState;
    }

  1. Listen to stateChanged stream:

import 'package:flutter/material.dart';
import 'package:frontegg_flutter/frontegg_flutter.dart';
import 'package:frontegg_flutter_example/login_page.dart';
import 'package:frontegg_flutter_example/user_page.dart';

    class MainPage extends StatelessWidget {
      const MainPage({super.key});

      @override
      Widget build(BuildContext context) {
        final frontegg = context.frontegg;
        return Scaffold(
          body: Center(
            child: StreamBuilder<FronteggState>(
              stream: frontegg.stateChanged,
              builder: (BuildContext context, AsyncSnapshot<FronteggState> snapshot) {
                if (snapshot.hasData) {
                  final state = snapshot.data!;
                  if (state.isAuthenticated && state.user != null) {
                    return const UserPage();
                  } else if (state.initializing) {
                    return const CircularProgressIndicator();
                  } else {
                    return const LoginPage();
                  }
                }

                return const SizedBox();
              },
            ),
          ),
        );
      }
    }

Other Frontegg functionalities

  1. logout - logs out from FronteggFlutter;
  2. refreshToken - refreshes accessToken and refreshToken only if needed, returns true if refreshing succeeds;
  3. getConstants - returns Frontegg Flutter initialization constants;
  4. directLoginAction - direct login with type and data.