1 files changed, 77 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth/OAuth/ChannelElements/UriOrOobEncoding.cs b/src/DotNetOpenAuth.OAuth/OAuth/ChannelElements/UriOrOobEncoding.cs
new file mode 100644
index 0000000..287ef01
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth/OAuth/ChannelElements/UriOrOobEncoding.cs
@@ -0,0 +1,77 @@
+//-----------------------------------------------------------------------
+// <copyright file="UriOrOobEncoding.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth.ChannelElements {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Reflection;
+
+	/// <summary>
+	/// An URI encoder that translates null <see cref="Uri"/> references as "oob" 
+	/// instead of an empty/missing argument.
+	/// </summary>
+	internal class UriOrOobEncoding : IMessagePartNullEncoder {
+		/// <summary>
+		/// The string constant "oob", used to indicate an out-of-band configuration.
+		/// </summary>
+		private const string OutOfBandConfiguration = "oob";
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="UriOrOobEncoding"/> class.
+		/// </summary>
+		public UriOrOobEncoding() {
+		}
+
+		#region IMessagePartNullEncoder Members
+
+		/// <summary>
+		/// Gets the string representation to include in a serialized message
+		/// when the message part has a <c>null</c> value.
+		/// </summary>
+		/// <value></value>
+		public string EncodedNullValue {
+			get { return OutOfBandConfiguration; }
+		}
+
+		#endregion
+
+		#region IMessagePartEncoder Members
+
+		/// <summary>
+		/// Encodes the specified value.
+		/// </summary>
+		/// <param name="value">The value.  Guaranteed to never be null.</param>
+		/// <returns>
+		/// The <paramref name="value"/> in string form, ready for message transport.
+		/// </returns>
+		public string Encode(object value) {
+			Uri uriValue = (Uri)value;
+			return uriValue.AbsoluteUri;
+		}
+
+		/// <summary>
+		/// Decodes the specified value.
+		/// </summary>
+		/// <param name="value">The string value carried by the transport.  Guaranteed to never be null, although it may be empty.</param>
+		/// <returns>
+		/// The deserialized form of the given string.
+		/// </returns>
+		/// <exception cref="FormatException">Thrown when the string value given cannot be decoded into the required object type.</exception>
+		public object Decode(string value) {
+			if (string.Equals(value, OutOfBandConfiguration, StringComparison.Ordinal)) {
+				return null;
+			} else {
+				return new Uri(value, UriKind.Absolute);
+			}
+		}
+
+		#endregion
+	}
+}