feat: Added OidcTokenExpiredEvent and OidcTokenExpiringEvent (#91)

* Added callbacks onTokenExpiring and onTokenExpired

* Replaced callbacks onTokenExpiring and onTokenExpired by event types OidcTokenExpiringEvent/OidcTokenExpiredEvent

* Do not try to refresh token if not supported by server

* format

---------

Co-authored-by: ahmednfwela <[email protected]>

packages/oidc_core/lib/src/managers/user_manager_base.dart

@@ -784,15 +784,6 @@ abstract class OidcUserManagerBase {
     if (user == null) {
       tokenEventsManager.unload();
     } else {
-      if (!discoveryDocument.grantTypesSupportedOrDefault
-          .contains(OidcConstants_GrantType.refreshToken)) {
-        //Server doesn't support refresh_token grant.
-        return;
-      }
-      if (user.token.refreshToken == null) {
-        // Can't refresh the access token anyway.
-        return;
-      }
       if (user.token.expiresIn == null) {
         // Can't know how much time is left.
         return;
@@ -803,6 +794,16 @@ abstract class OidcUserManagerBase {
 
   @protected
   Future<void> handleTokenExpiring(OidcToken event) async {
+    eventsController.add(
+      OidcTokenExpiringEvent.now(currentToken: event),
+    );
+
+    if (!discoveryDocument.grantTypesSupportedOrDefault
+        .contains(OidcConstants_GrantType.refreshToken)) {
+      //Server doesn't support refresh_token grant.
+      return;
+    }
+
     final refreshToken = event.refreshToken;
     if (refreshToken == null) {
       return;
@@ -843,6 +844,10 @@ abstract class OidcUserManagerBase {
 
   @protected
   void handleTokenExpired(OidcToken event) {
+    eventsController.add(
+      OidcTokenExpiredEvent.now(currentToken: event),
+    );
+
     if (!settings.supportOfflineAuth) {
       forgetUser();
     }

packages/oidc_core/lib/src/models/events/_exports.dart

@@ -1,2 +1,4 @@
 export 'event.dart';
 export 'pre_logout_event.dart';
+export 'token_expired_event.dart';
+export 'token_expiring_event.dart';

packages/oidc_core/lib/src/models/events/token_expired_event.dart

@@ -0,0 +1,18 @@
+import 'package:oidc_core/oidc_core.dart';
+
+/// An event that gets raised after a token expired.
+class OidcTokenExpiredEvent extends OidcEvent {
+  ///
+  const OidcTokenExpiredEvent({
+    required this.currentToken,
+    required super.at,
+  });
+
+  ///
+  OidcTokenExpiredEvent.now({
+    required this.currentToken,
+  }) : super.now();
+
+  /// The current token that is expired.
+  final OidcToken currentToken;
+}

packages/oidc_core/lib/src/models/events/token_expiring_event.dart

@@ -0,0 +1,18 @@
+import 'package:oidc_core/oidc_core.dart';
+
+/// An event that gets raised before a token expires.
+class OidcTokenExpiringEvent extends OidcEvent {
+  ///
+  const OidcTokenExpiringEvent({
+    required this.currentToken,
+    required super.at,
+  });
+
+  ///
+  OidcTokenExpiringEvent.now({
+    required this.currentToken,
+  }) : super.now();
+
+  /// The current token that is expiring.
+  final OidcToken currentToken;
+}