1 files changed, 121 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/MessagePartAttribute.cs b/src/DotNetOpenAuth.Core/Messaging/MessagePartAttribute.cs
new file mode 100644
index 0000000..22c660c
--- /dev/null
+++ b/src/DotNetOpenAuth.Core/Messaging/MessagePartAttribute.cs
@@ -0,0 +1,121 @@
+//-----------------------------------------------------------------------
+// <copyright file="MessagePartAttribute.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+	using System.Diagnostics;
+	using System.Net.Security;
+	using System.Reflection;
+
+	/// <summary>
+	/// Applied to fields and properties that form a key/value in a protocol message.
+	/// </summary>
+	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, Inherited = true, AllowMultiple = true)]
+	[DebuggerDisplay("MessagePartAttribute {Name}")]
+	public sealed class MessagePartAttribute : Attribute {
+		/// <summary>
+		/// The overridden name to use as the serialized name for the property.
+		/// </summary>
+		private string name;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MessagePartAttribute"/> class.
+		/// </summary>
+		public MessagePartAttribute() {
+			this.AllowEmpty = true;
+			this.MinVersionValue = new Version(0, 0);
+			this.MaxVersionValue = new Version(int.MaxValue, 0);
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MessagePartAttribute"/> class.
+		/// </summary>
+		/// <param name="name">
+		/// A special name to give the value of this member in the serialized message.
+		/// When null or empty, the name of the member will be used in the serialized message.
+		/// </param>
+		public MessagePartAttribute(string name)
+			: this() {
+			this.Name = name;
+		}
+
+		/// <summary>
+		/// Gets the name of the serialized form of this member in the message.
+		/// </summary>
+		public string Name {
+			get { return this.name; }
+			private set { this.name = string.IsNullOrEmpty(value) ? null : value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the level of protection required by this member in the serialized message.
+		/// </summary>
+		/// <remarks>
+		/// Message part protection must be provided and verified by the channel binding element(s)
+		/// that provide security.
+		/// </remarks>
+		public ProtectionLevel RequiredProtection { get; set; }
+
+		/// <summary>
+		/// Gets or sets a value indicating whether this member is a required part of the serialized message.
+		/// </summary>
+		public bool IsRequired { get; set; }
+
+		/// <summary>
+		/// Gets or sets a value indicating whether the string value is allowed to be empty in the serialized message.
+		/// </summary>
+		/// <value>Default is true.</value>
+		public bool AllowEmpty { get; set; }
+
+		/// <summary>
+		/// Gets or sets an IMessagePartEncoder custom encoder to use
+		/// to translate the applied member to and from a string.
+		/// </summary>
+		public Type Encoder { get; set; }
+
+		/// <summary>
+		/// Gets or sets the minimum version of the protocol this attribute applies to
+		/// and overrides any attributes with lower values for this property.
+		/// </summary>
+		/// <value>Defaults to 0.0.</value>
+		public string MinVersion {
+			get { return this.MinVersionValue.ToString(); }
+			set { this.MinVersionValue = new Version(value); }
+		}
+
+		/// <summary>
+		/// Gets or sets the maximum version of the protocol this attribute applies to.
+		/// </summary>
+		/// <value>Defaults to int.MaxValue for the major version number.</value>
+		/// <remarks>
+		/// Specifying <see cref="MinVersion"/> on another attribute on the same member
+		/// automatically turns this attribute off.  This property should only be set when
+		/// a property is totally dropped from a newer version of the protocol.
+		/// </remarks>
+		public string MaxVersion {
+			get { return this.MaxVersionValue.ToString(); }
+			set { this.MaxVersionValue = new Version(value); }
+		}
+
+		/// <summary>
+		/// Gets or sets the minimum version of the protocol this attribute applies to
+		/// and overrides any attributes with lower values for this property.
+		/// </summary>
+		/// <value>Defaults to 0.0.</value>
+		internal Version MinVersionValue { get; set; }
+
+		/// <summary>
+		/// Gets or sets the maximum version of the protocol this attribute applies to.
+		/// </summary>
+		/// <value>Defaults to int.MaxValue for the major version number.</value>
+		/// <remarks>
+		/// Specifying <see cref="MinVersion"/> on another attribute on the same member
+		/// automatically turns this attribute off.  This property should only be set when
+		/// a property is totally dropped from a newer version of the protocol.
+		/// </remarks>
+		internal Version MaxVersionValue { get; set; }
+	}
+}