flutter_web_auth_2 2.0.0 
flutter_web_auth_2: ^2.0.0 copied to clipboard
femtopedia.deFlutter plugin for authenticating a user with a web service.
Web Auth 2 for Flutter #
This project is a continuation of flutter_web_auth by Linus Unnebäck.
A Flutter plugin for authenticating a user with a web service, even if the web service is run by a third party. Most commonly used with OAuth2, but can be used with any web flow that can redirect to a custom scheme.
In the background, this plugin uses ASWebAuthenticationSession on iOS 12+ and macOS 10.15+, SFAuthenticationSession on iOS 11, Chrome Custom Tabs on Android and opens a new window on Web. You can build it with iOS 8+, but it is currently only supported by iOS 11 or higher.
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Usage #
To authenticate against your own custom site:
import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
// Present the dialog to the user
final result = await FlutterWebAuth2.authenticate(url: "https://my-custom-app.com/connect", callbackUrlScheme: "my-custom-app");
// Extract token from resulting url
final token = Uri.parse(result).queryParameters['token'];
To authenticate the user using Google's OAuth2:
import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
import 'dart:convert' show jsonDecode;
import 'package:http/http.dart' as http;
// App specific variables
final googleClientId = 'XXXXXXXXXXXX-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com';
final callbackUrlScheme = 'com.googleusercontent.apps.XXXXXXXXXXXX-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
// Construct the url
final url = Uri.https('accounts.google.com', '/o/oauth2/v2/auth', {
'response_type': 'code',
'client_id': googleClientId,
'redirect_uri': '$callbackUrlScheme:/',
'scope': 'email',
});
// Present the dialog to the user
final result = await FlutterWebAuth2.authenticate(url: url.toString(), callbackUrlScheme: callbackUrlScheme);
// Extract code from resulting url
final code = Uri.parse(result).queryParameters['code'];
// Use this code to get an access token
final response = await http.post('https://www.googleapis.com/oauth2/v4/token', body: {
'client_id': googleClientId,
'redirect_uri': '$callbackUrlScheme:/',
'grant_type': 'authorization_code',
'code': code,
});
// Get the access token from the response
final accessToken = jsonDecode(response.body)['access_token'] as String;
Upgrading from flutter_web_auth #
If you used flutter_web_auth correctly (and without extra hackage) before, it should be sufficient to replace the following strings everywhere (yes, also in AndroidManifest.xml for example):
FlutterWebAuth->FlutterWebAuth2flutter_web_auth->flutter_web_auth_2
If you are still unsure or something is not working as well as before, please open a new issue.
Setup #
Setup works as for any Flutter plugin, expect the Android and Web caveats outlined below:
Android #
In order to capture the callback url, the following activity needs to be added to your AndroidManifest.xml. Be sure to replace YOUR_CALLBACK_URL_SCHEME_HERE with your actual callback url scheme.
<manifest>
<application>
<activity
android:name="com.linusu.flutter_web_auth_2.CallbackActivity"
android:exported="true">
<intent-filter android:label="flutter_web_auth_2">
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="YOUR_CALLBACK_URL_SCHEME_HERE" />
</intent-filter>
</activity>
</application>
</manifest>
Web #
On the Web platform an endpoint needs to be created that captures the callback URL and sends it to the application using the JavaScript postMessage() method. In the ./web folder of the project, create an HTML file with the name e.g. auth.html with content:
<!DOCTYPE html>
<title>Authentication complete</title>
<p>Authentication is complete. If this does not happen automatically, please close the window.
<script>
window.opener.postMessage({
'flutter-web-auth-2': window.location.href
}, window.location.origin);
window.close();
</script>
Redirection URL passed to the authentication service must be the same as the URL on which the application is running (schema, host, port if necessary) and the path must point to created HTML file, /auth.html in this case. The callbackUrlScheme parameter of the authenticate() method does not take into account, so it is possible to use a schema for native platforms in the code.
For the Sign in with Apple in web_message response mode, postMessage from https://appleid.apple.com is also captured, and the authorization object is returned as a URL fragment encoded as a query string (for compatibility with other providers).
Windows #
There is still a limitation that the callback URL scheme must start with http://localhost:{port}.
If you have any experience in removing that limitation, please let me know!
Metadata
Publisher
Metadata
Flutter plugin for authenticating a user with a web service.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
ffi, flutter, flutter_web_auth_2_platform_interface, flutter_web_plugins, url_launcher, win32
