1 files changed, 26 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/Crypto/JwtMessageBase.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/Crypto/JwtMessageBase.cs
new file mode 100644
index 0000000..04b9655
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/Crypto/JwtMessageBase.cs
@@ -0,0 +1,26 @@
+namespace DotNetOpenAuth.OAuth2.Crypto {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+
+	internal class JwtMessageBase : IMessage {
+		private static readonly Version version = new Version(1, 0);
+
+		private readonly Dictionary<string, string> extraData = new Dictionary<string, string>();
+
+		public Version Version {
+			get { return version; }
+		}
+
+		public IDictionary<string, string> ExtraData {
+			get { return this.extraData; }
+		}
+
+		public virtual void EnsureValidMessage() {
+			// The JWT spec mandates that any unexpected data in the JWT header or claims set cause a rejection.
+			ErrorUtilities.VerifyProtocol(this.ExtraData.Count == 0, "Unrecognized data in JWT access token with key '{0}'.  Token rejected.", this.ExtraData.First().Key);
+		}
+	}
+}