Add RedditClaimTypes

src/AspNet.Security.OAuth.Reddit/RedditAuthenticationOptions.cs

@@ -30,7 +30,7 @@ public RedditAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
-            ClaimActions.MapJsonKey("urn:reddit:over18", "over_18");
+            ClaimActions.MapJsonKey(RedditClaimTypes.Over18, "over_18");
         }
 
         /// <summary>

src/AspNet.Security.OAuth.Reddit/RedditClaimTypes.cs

@@ -0,0 +1,16 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+ * See https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers
+ * for more information concerning the license and the contributors participating to this project.
+ */
+
+namespace AspNet.Security.OAuth.Reddit
+{
+    /// <summary>
+    /// Contains claim types specific to the <see cref="RedditAuthenticationHandler"/>.
+    /// </summary>
+    public static class RedditClaimTypes
+    {
+        public const string Over18 = "urn:reddit:over18";
+    }
+}