1 files changed, 66 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/StandardAccessTokenAnalyzer.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/StandardAccessTokenAnalyzer.cs
new file mode 100644
index 0000000..f2b7d1c
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+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/StandardAccessTokenAnalyzer.cs
@@ -0,0 +1,66 @@
+//-----------------------------------------------------------------------
+// <copyright file="StandardAccessTokenAnalyzer.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2 {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Security.Cryptography;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.OAuth2.ChannelElements;
+
+	/// <summary>
+	/// An access token reader that understands DotNetOpenAuth authorization server issued tokens.
+	/// </summary>
+	public class StandardAccessTokenAnalyzer : IAccessTokenAnalyzer {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="StandardAccessTokenAnalyzer"/> class.
+		/// </summary>
+		/// <param name="authorizationServerPublicSigningKey">The crypto service provider with the authorization server public signing key.</param>
+		/// <param name="resourceServerPrivateEncryptionKey">The crypto service provider with the resource server private encryption key.</param>
+		public StandardAccessTokenAnalyzer(RSACryptoServiceProvider authorizationServerPublicSigningKey, RSACryptoServiceProvider resourceServerPrivateEncryptionKey) {
+			Requires.NotNull(authorizationServerPublicSigningKey, "authorizationServerPublicSigningKey");
+			Requires.NotNull(resourceServerPrivateEncryptionKey, "resourceServerPrivateEncryptionKey");
+			Requires.True(!resourceServerPrivateEncryptionKey.PublicOnly, "resourceServerPrivateEncryptionKey");
+			this.AuthorizationServerPublicSigningKey = authorizationServerPublicSigningKey;
+			this.ResourceServerPrivateEncryptionKey = resourceServerPrivateEncryptionKey;
+		}
+
+		/// <summary>
+		/// Gets the authorization server public signing key.
+		/// </summary>
+		/// <value>The authorization server public signing key.</value>
+		public RSACryptoServiceProvider AuthorizationServerPublicSigningKey { get; private set; }
+
+		/// <summary>
+		/// Gets the resource server private encryption key.
+		/// </summary>
+		/// <value>The resource server private encryption key.</value>
+		public RSACryptoServiceProvider ResourceServerPrivateEncryptionKey { get; private set; }
+
+		/// <summary>
+		/// Reads an access token to find out what data it authorizes access to.
+		/// </summary>
+		/// <param name="message">The message carrying the access token.</param>
+		/// <param name="accessToken">The access token.</param>
+		/// <param name="user">The user whose data is accessible with this access token.</param>
+		/// <param name="scope">The scope of access authorized by this access token.</param>
+		/// <returns>
+		/// A value indicating whether this access token is valid.
+		/// </returns>
+		/// <remarks>
+		/// This method also responsible to throw a <see cref="ProtocolException"/> or return
+		/// <c>false</c> when the access token is expired, invalid, or from an untrusted authorization server.
+		/// </remarks>
+		public virtual bool TryValidateAccessToken(IDirectedProtocolMessage message, string accessToken, out string user, out HashSet<string> scope) {
+			var accessTokenFormatter = AccessToken.CreateFormatter(this.AuthorizationServerPublicSigningKey, this.ResourceServerPrivateEncryptionKey);
+			var token = accessTokenFormatter.Deserialize(message, accessToken);
+			user = token.User;
+			scope = new HashSet<string>(token.Scope, OAuthUtilities.ScopeStringComparer);
+			return true;
+		}
+	}
+}