Adds implementation for RP initiated logout

README.md

@@ -13,16 +13,14 @@ It currently supports these features:
 * parsing and validating id tokens
 * basic tools for implementing implicit and authorization code flow
 * authentication for command line tools
-
+* RP initiated logout
 
 Besides authentication providers that support OpenID Connect, this 
 library can also work with other authentication providers supporting
 oauth2, like Facebook. For these providers, some features (e.g. discovery and id tokens) 
 will not work. You should define the metadata for those providers manually, except
 for Facebook, which is predefined in the library.
 
-
-
 ## Usage
 
 Below are some examples of how to use the library. For more examples, see the [`example` folder](example/example.md). It contains full examples of how to use the library with a keycloak server in a flutter, command line and browser application.

lib/openid_client_io.dart

@@ -1,10 +1,13 @@
 library openid_client.io;
 
 import 'dart:async';
-import 'dart:io';
 import 'dart:developer';
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
 
 import 'openid_client.dart';
+import 'src/http_util.dart' as http_util;
 
 export 'openid_client.dart';
 
@@ -158,6 +161,37 @@ class Authenticator {
       _requestServers.clear();
     }
   }
+
+  /// Performs OpenID connect RP-Initiated Logout according to specification
+  /// See: https://openid.net/specs/openid-connect-rpinitiated-1_0.html#RPLogout
+  FutureOr<void> logout({
+    required Uri endSessionEndpoint,
+    Map<String, String>? headers,
+    http.Client? client,
+    String? idTokenHint,
+    String? logoutHint,
+    String? clientId,
+    String? postLogoutRedirectUri,
+    String? state,
+    String? uiLocales,
+  }) async {
+    headers ??= <String, String>{};
+    final body = <String, String>{
+      if (idTokenHint != null) 'id_token_hint': idTokenHint,
+      if (logoutHint != null) 'logout_hint': logoutHint,
+      if (clientId != null) 'client_id': clientId,
+      if (postLogoutRedirectUri != null)
+        'post_logout_redirect_uri': postLogoutRedirectUri,
+      if (state != null) 'state': state,
+      if (uiLocales != null) 'ui_locales': uiLocales,
+    };
+    await http_util.post(
+      endSessionEndpoint,
+      headers: headers,
+      body: body,
+      client: client,
+    );
+  }
 }
 
 void _runBrowser(String url) {