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+//-----------------------------------------------------------------------
+// <copyright file="OAuthAuthorizationServer.cs" company="Andrew Arnott">
+// Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace RelyingPartyLogic {
+ using System;
+ using System.Collections.Generic;
+ using System.Linq;
+ using System.Security.Cryptography;
+ using System.Text;
+
+ using DotNetOpenAuth.Messaging.Bindings;
+ using DotNetOpenAuth.OAuth2;
+
+ /// <summary>
+ /// Provides OAuth 2.0 authorization server information to DotNetOpenAuth.
+ /// </summary>
+ public class OAuthAuthorizationServer : IAuthorizationServer {
+ internal static readonly RSAParameters AsymmetricKey;
+
+ private static readonly byte[] secret;
+
+ private readonly INonceStore nonceStore = new NonceDbStore();
+
+ static OAuthAuthorizationServer() {
+ // TODO: Replace this sample code with real code.
+ // For this sample, we just generate random secrets.
+ RandomNumberGenerator crypto = new RNGCryptoServiceProvider();
+ secret = new byte[16];
+ crypto.GetBytes(secret);
+
+ AsymmetricKey = new RSACryptoServiceProvider().ExportParameters(true);
+ }
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="OAuthAuthorizationServer"/> class.
+ /// </summary>
+ public OAuthAuthorizationServer() {
+ }
+
+ #region IAuthorizationServer Members
+
+ /// <summary>
+ /// Gets the secret used to symmetrically encrypt and sign authorization codes and refresh tokens.
+ /// </summary>
+ /// <value></value>
+ /// <remarks>
+ /// This secret should be kept strictly confidential in the authorization server(s)
+ /// and NOT shared with the resource server. Anyone with this secret can mint
+ /// tokens to essentially grant themselves access to anything they want.
+ /// </remarks>
+ public byte[] Secret {
+ get { return secret; }
+ }
+
+ /// <summary>
+ /// Gets the asymmetric private key to use for signing access tokens.
+ /// </summary>
+ /// <value></value>
+ /// <remarks>
+ /// The public key in the private/public key pair will be used by the resource
+ /// servers to validate that the access token is minted by a trusted authorization server.
+ /// </remarks>
+ public RSAParameters AccessTokenSigningPrivateKey {
+ get { return AsymmetricKey; }
+ }
+
+ /// <summary>
+ /// Gets the authorization code nonce store to use to ensure that authorization codes can only be used once.
+ /// </summary>
+ /// <value>The authorization code nonce store.</value>
+ public INonceStore VerificationCodeNonceStore {
+ get { return this.nonceStore; }
+ }
+
+ /// <summary>
+ /// Gets the client with a given identifier.
+ /// </summary>
+ /// <param name="clientIdentifier">The client identifier.</param>
+ /// <returns>The client registration. Never null.</returns>
+ /// <exception cref="ArgumentException">Thrown when no client with the given identifier is registered with this authorization server.</exception>
+ public IConsumerDescription GetClient(string clientIdentifier) {
+ return Database.DataContext.Consumers.First(c => c.ConsumerKey == clientIdentifier);
+ }
+
+ /// <summary>
+ /// Determines whether a described authorization is (still) valid.
+ /// </summary>
+ /// <param name="authorization">The authorization.</param>
+ /// <returns>
+ /// <c>true</c> if the original authorization is still valid; otherwise, <c>false</c>.
+ /// </returns>
+ /// <remarks>
+ /// <para>When establishing that an authorization is still valid,
+ /// it's very important to only match on recorded authorizations that
+ /// meet these criteria:</para>
+ /// 1) The client identifier matches.
+ /// 2) The user account matches.
+ /// 3) The scope on the recorded authorization must include all scopes in the given authorization.
+ /// 4) The date the recorded authorization was issued must be <em>no later</em> that the date the given authorization was issued.
+ /// <para>One possible scenario is where the user authorized a client, later revoked authorization,
+ /// and even later reinstated authorization. This subsequent recorded authorization
+ /// would not satisfy requirement #4 in the above list. This is important because the revocation
+ /// the user went through should invalidate all previously issued tokens as a matter of
+ /// security in the event the user was revoking access in order to sever authorization on a stolen
+ /// account or piece of hardware in which the tokens were stored. </para>
+ /// </remarks>
+ public bool IsAuthorizationValid(DotNetOpenAuth.OAuth2.ChannelElements.IAuthorizationDescription authorization) {
+ // We don't support revoking tokens yet.
+ return true;
+ }
+
+ #endregion
+ }
+}