1 files changed, 51 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/ScopeEncoder.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/ScopeEncoder.cs
new file mode 100644
index 0000000..7ae5fbf
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/ScopeEncoder.cs
@@ -0,0 +1,51 @@
+//-----------------------------------------------------------------------
+// <copyright file="ScopeEncoder.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2.ChannelElements {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Reflection;
+
+	/// <summary>
+	/// Encodes or decodes a set of scopes into the OAuth 2.0 scope message part.
+	/// </summary>
+	internal class ScopeEncoder : IMessagePartEncoder {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ScopeEncoder"/> class.
+		/// </summary>
+		public ScopeEncoder() {
+		}
+
+		/// <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) {
+			var scopes = (IEnumerable<string>)value;
+			ErrorUtilities.VerifyProtocol(!scopes.Any(scope => scope.Contains(" ")), OAuthStrings.ScopesMayNotContainSpaces);
+			return (scopes != null && scopes.Any()) ? string.Join(" ", scopes.ToArray()) : null;
+		}
+
+		/// <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) {
+			return OAuthUtilities.SplitScopes(value);
+		}
+	}
+}