aad_b2c_webview 0.1.0

A simple Flutter package which embeds webview for accessing Azure AD B2C user flow endpoint.

Azure AD B2C Embedded Webview

Azure AD B2C Embedded Webview is a very simple Flutter package that demonstrates how to use the embedded web view to sign in users with Azure AD B2C. Currently, using Flutter packages - appAuth and flutter_azure_b2c redirects to browser and doesn't provide in-app experience.

This package embeds the web view of the user flow endpoint using flutter_appview and redirects the user as per onRedirect callback method.

📚 Features

• Login Button
• Webview Interaction
• Flutter UI Customization
• Dynamic Flutter Layout
• Refresh Token

🚀 Getting started

To use the package in your Flutter app, add the following code to your main.dart file:

dependencies:
  aad_b2c_webview: <latest_version>

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🛠️ Usage

Parameters

It is recommended to use env to save the keys securely

const aadB2CClientID = "<app-id>";
const aadB2CRedirectURL = "https://myurl.com/myappname";
const aadB2CUserFlowName = "B2C_1_APPNAME_Signin";
const aadB2CScopes = ['openid', 'offline_access'];
const aadB2CTenantName = "<tenantName>";
const aadB2CUserAuthFlow = "https://$aadB2CTenantName.b2clogin.com/$aadB2CTenantName.onmicrosoft.com";

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Where to find?

• aadB2CClientID
• aadB2CTenantName
• aadB2CUserFlowName
• aadB2CRedirectURL
• aadB2CScopes

Configure parameters in the code

B2CWebViewParams params = B2CWebViewParams(
  responseType: Constants.defaultResponseType,
  tenantBaseUrl: aadB2CUserAuthFlow,
  clientId: aadB2CClientID,
  userFlowName: aadB2CUserFlowName,
  redirectUrl: aadB2CRedirectURL,
  scopes: aadB2CScopes,
  containsChallenge: true,
  isLoginFlow: true,
);

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Send Optional Parameters

You have the flexibility to include optional parameters in order to customize the URL according to your specific requirements. The optionalParameters parameter allows you to pass a list of OptionalParam objects, where each object consists of a key and a value that represent the parameter name and its corresponding value, respectively.

Here's an example of how you can utilize the optionalParameters parameter to add new parameters to the URL:

optionalParameters: [
  OptionalParam(key: "parameter1", value: "value1"),
  OptionalParam(key: "parameter2", value: "value2"),
],

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In the above example, we include two optional parameters: "parameter1" with the value "value1" and "parameter2" with the value "value2". You can include multiple OptionalParam objects within the list to incorporate multiple optional parameters in the URL.

These optional parameters provide you with the ability to customize the behavior of the URL and conveniently transmit additional information as per your needs.

Login Button

To add the easy to use sign in with microsoft button simply use the AADB2CBase.button widget and a beautiful sign in button appears as shown below.

Configuration

Add the following /android/app/src/main/AndroidManifest.xml inside the tags:

<meta-data android:name="flutter_deeplinking_enabled" android:value="true" />
<intent-filter android:autoVerify="true">
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="https" android:host="myurl.com" />
</intent-filter>

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Change the redirect URL in our flutter code to https://myurl.com/myappname and add this as a redirect URL in the Azure AD B2C project

Example

import 'package:aad_b2c_webview/aad_b2c_webview.dart';
import 'package:flutter/material.dart';

class B2CWithButton extends StatelessWidget {
  final B2CWebViewParams params;
  const B2CWithButton({super.key, required this.params});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Text(
                'Azure B2C Button',
                style: TextStyle(
                  fontSize: 24.0,
                  fontWeight: FontWeight.bold,
                ),
              ),
              const SizedBox(height: 16.0),
              AADB2CBase.button(
                params: params,
                settings: ButtonSettingsEntity(
                  onError: _onError,
                  onSuccess: _onSuccess,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  _onSuccess(
      BuildContext context,
      accessToken,
      idToken,
      refreshToken,
      ) {
    var snackBar = const SnackBar(
      content: Text('Successfully Authenticated!'),
      backgroundColor: Colors.green,
    );
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }

  _onError(BuildContext context, String? error) {
    var snackBar = SnackBar(
      content: Text(error ?? ''),
      backgroundColor: Colors.redAccent,
    );
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }
}

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Click here to access the full example

Webview Interaction

Custom build sign in button to call web view page

Example

import 'dart:developer';
import 'package:aad_b2c_webview/aad_b2c_webview.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'widgets/button_widget.dart';

class B2CWithWebView extends StatefulWidget {
  final B2CWebViewParams params;
  const B2CWithWebView({super.key, required this.params});

  @override
  State<B2CWithWebView> createState() => _B2CWithWebViewState();
}

class _B2CWithWebViewState extends State<B2CWithWebView> {
  ActionController? _controller;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      resizeToAvoidBottomInset: false,
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Center(
                child: Text(
                  'Azure B2C WebView',
                  style: TextStyle(
                    fontSize: 24.0,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
              const SizedBox(height: 16.0),
              SizedBox(
                height: MediaQuery.sizeOf(context).height * 0.6,
                width: MediaQuery.sizeOf(context).width,
                child: AADB2CBase.webview(
                  params: widget.params,
                  settings: WebViewSettingsEntity(
                    onError: _onError,
                    onSuccess: _onSuccess,
                    controllerBuilder: (
                      BuildContext context,
                      ActionController action,
                    ) => _controller = action,
                  ),
                ),
              ),
              const SizedBox(height: 16.0),
              ButtonWidget(
                onTap: () async {
                  try {
                    await _controller?.insertAndClick(
                      listIdValue: [
                        ActionEntity(id: 'email', value: '[e-mail]'),
                        ActionEntity(id: 'password', value: '12345678'),
                      ],
                      buttonId: 'next',
                    );
                  } catch (error, trace) {
                    if (kDebugMode) log('Error: $error', stackTrace: trace);
                  }
                },
                title: 'Interact with webview',
                icon: Icons.move_up_outlined,
              ),
            ],
          ),
        ),
      ),
    );
  }

  _onSuccess(
    BuildContext context,
    accessToken,
    idToken,
    refreshToken,
  ) {
    var snackBar = const SnackBar(
      content: Text('Successfully Authenticated!'),
      backgroundColor: Colors.green,
    );
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }

  _onError(BuildContext context, String? error) {
    var snackBar = SnackBar(
      content: Text(error ?? ''),
      backgroundColor: Colors.redAccent,
    );
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }
}

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Flutter UI Customization

Get all the power of Flutter/Dart to customize the layout of Azure authentication screens

Sign In

Sign Up & Sign In & MFA

Full Examples

• Simple Customization
• Multiple Customization

Dynamic Flutter Layout

Convert layout to flutter automatically

Example

import 'package:aad_b2c_webview/aad_b2c_webview.dart';
import 'package:example/core/commons.dart';
import 'package:flutter/material.dart';
import 'widgets/button_widget.dart';

class B2CWithDynamicCustomization extends StatefulWidget {
  final B2CWebViewParams params;
  const B2CWithDynamicCustomization({super.key, required this.params});

  @override
  State<B2CWithDynamicCustomization> createState() =>
      _B2CWithDynamicCustomizationState();
}

class _B2CWithDynamicCustomizationState
    extends State<B2CWithDynamicCustomization> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Scaffold(
        body: AADB2CBase.custom(
          params: widget.params,
          settings: CustomSettingsEntity(
            onError: (BuildContext context, String? error) {
              setState(() => _isLoading = false);
              var snackBar = SnackBar(
                content: Text(error ?? ''),
                backgroundColor: Colors.redAccent,
              );
              ScaffoldMessenger.of(context).showSnackBar(snackBar);
            },
            onSuccess: (context, accessToken, idToken, refreshToken) async {
              setState(() => _isLoading = false);
              var snackBar = const SnackBar(
                content: Text('Successfully Authenticated!'),
                backgroundColor: Colors.green,
              );
              ScaffoldMessenger.of(context).showSnackBar(snackBar);
            },
            pageBuilder: (_, __, controller, List<HtmlParseEntity>? htmlItems) {
              return Padding(
                padding: const EdgeInsets.all(32.0),
                child: Form(
                  key: _formKey,
                  child: CustomScrollView(
                    slivers: [
                      defaultImage(),
                      buildTitle('B2C Page Dynamic'),
                      SliverList.builder(
                        itemCount: htmlItems?.length ?? 0,
                        itemBuilder: (BuildContext context, int index) {
                          final item = htmlItems?[index];
                          if (item?.type == null) return const SizedBox();
                          return switch (item!.type) {
                            HtmlParseType.input => _inputBuilder(item),
                            HtmlParseType.button => _button(
                                controller,
                                item,
                                false,
                              ),
                            HtmlParseType.a => _button(
                                controller,
                                item,
                                true,
                              ),
                            HtmlParseType.none => const SizedBox(),
                          };
                        },
                      ),
                    ],
                  ),
                ),
              );
            },
          ),
        ),
      ),
    );
  }

  bool _isLoading = false;
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  final TextEditingController _emailController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();

  Widget _inputBuilder(HtmlParseEntity params) {
    return TextFormField(
      controller: TextEditingController(),
      enabled: !_isLoading,
      decoration: InputDecoration(
        labelText: params.name,
      ),
      keyboardType: TextInputType.text,
    );
  }

  Widget _button(
    ActionController controller,
    HtmlParseEntity params,
    bool isLink,
  ) {
    onTap() async {
      if (_formKey.currentState?.validate() ?? false) {
        setState(() => _isLoading = true);
        String email = _emailController.text.trim();
        String password = _passwordController.text.trim();
        await controller.insertAndClick(
          listIdValue: [
            ActionEntity(id: 'email', value: email),
            ActionEntity(id: 'password', value: password),
          ],
          buttonId: 'next',
        );
      }
    }

    if (_isLoading) return _buildLoading();
    if (isLink) {
      return TextButton(
        onPressed: onTap,
        child: Text(
          params.textContent,
          style: const TextStyle(
            decorationStyle: TextDecorationStyle.solid,
          ),
        ),
      );
    }
    return ButtonWidget(
      title: params.textContent,
      icon: Icons.login_outlined,
      onTap: onTap,
    );
  }

  Widget _buildLoading() {
    return const Column(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        CircularProgressIndicator(),
      ],
    );
  }
}

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Refresh Token

Use the code below to refresh the token

Example

await controller.refreshToken(
  B2CAuthEntity(
    refreshToken: _refreshTokenController.text.trim(),
    userFlowName: aadB2CUserFlowName,
    tenantBaseUrl: aadB2CUserAuthFlow,
    clientId: aadB2CClientID,
  ),
);

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Click here to access the full example