integration https://github.com/XacronDevelopment/oauth-aspnet

Yavsc/Helpers/AuthHelpers.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Authentication;
+
+namespace Yavsc.Extensions {
+    public static class HttpContextExtensions {
+        public static IEnumerable<AuthenticationDescription> GetExternalProviders(this HttpContext context) {
+            if (context == null) {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            return from description in context.Authentication.GetAuthenticationSchemes()
+                   where !string.IsNullOrEmpty(description.DisplayName)
+                   select description;
+        }
+
+        public static bool IsProviderSupported(this HttpContext context, string provider) {
+            if (context == null) {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            return (from description in context.GetExternalProviders()
+                    where string.Equals(description.AuthenticationScheme, provider, StringComparison.OrdinalIgnoreCase)
+                    select description).Any();
+        }
+    }
+}