Add DeviantArtClaimTypes

src/AspNet.Security.OAuth.DeviantArt/DeviantArtAuthenticationOptions.cs

@@ -29,7 +29,7 @@ public DeviantArtAuthenticationOptions()
 
             ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "userid");
             ClaimActions.MapJsonKey(ClaimTypes.Name, "username");
-            ClaimActions.MapJsonKey("urn:DeviantArt:name", "username");
+            ClaimActions.MapJsonKey(DeviantArtClaimTypes.Username, "username");
         }
     }
 }

src/AspNet.Security.OAuth.DeviantArt/DeviantArtClaimTypes.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.DeviantArt
+{
+    /// <summary>
+    /// Contains claim types specific to the <see cref="DeviantArtAuthenticationHandler"/>.
+    /// </summary>
+    public static class DeviantArtClaimTypes
+    {
+        public const string Username = "urn:DeviantArt:name";
+    }
+}