Merge pull request 'Added token hint to logout event' (#90) from payments into master

Reviewed-on: #90

LiteCharms.Features/Extensions/Api.cs

@@ -10,7 +10,7 @@ public static class Api
     public const string Books = nameof(Books);
     public const string Payments = nameof(Payments);
 
-    public static IServiceCollection AddLiteCharmsUiSecurity(this IServiceCollection services, IConfiguration configuration)
+    public static IServiceCollection AddLiteCharmsWebSecurity(this IServiceCollection services, IConfiguration configuration)
     {
         var configSection = configuration.GetSection(nameof(LiteCharmsSettings));
 
@@ -40,6 +40,24 @@ public static class Api
             options.Scope.Add("openid");
             options.Scope.Add("profile");
             options.Scope.Add("email");
+
+            options.Events = new OpenIdConnectEvents
+            {
+                OnRedirectToIdentityProviderForSignOut = context =>
+                {
+                    var idToken = context.ProtocolMessage.IdTokenHint;
+
+                    if (string.IsNullOrEmpty(idToken))
+                    {
+                        var tokens = context.Properties.GetTokens();
+                        var idTokenItem = tokens.FirstOrDefault(t => string.Equals(t.Name, "id_token", StringComparison.Ordinal));
+
+                        if (idTokenItem != null) context.ProtocolMessage.IdTokenHint = idTokenItem.Value;
+                    }
+
+                    return Task.CompletedTask;
+                },
+            };
         });
 
         services.AddCascadingAuthenticationState();