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//-----------------------------------------------------------------------
// <copyright file="AuthorizationServer.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.Linq;
using System.Security.Cryptography;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OAuth2.ChannelElements;
using DotNetOpenAuth.OAuth2.Messages;
/// <summary>
/// Authorization Server supporting the web server flow.
/// </summary>
public class AuthorizationServer {
/// <summary>
/// Initializes a new instance of the <see cref="AuthorizationServer"/> class.
/// </summary>
/// <param name="authorizationServer">The authorization server.</param>
public AuthorizationServer(IAuthorizationServer authorizationServer) {
Contract.Requires<ArgumentNullException>(authorizationServer != null, "authorizationServer");
this.OAuthChannel = new OAuth2AuthorizationServerChannel(authorizationServer);
}
/// <summary>
/// Gets the channel.
/// </summary>
/// <value>The channel.</value>
public Channel Channel {
get { return this.OAuthChannel; }
}
/// <summary>
/// Gets the authorization server.
/// </summary>
/// <value>The authorization server.</value>
public IAuthorizationServer AuthorizationServerServices {
get { return this.OAuthChannel.AuthorizationServer; }
}
/// <summary>
/// Gets the channel.
/// </summary>
internal OAuth2AuthorizationServerChannel OAuthChannel { get; private set; }
/// <summary>
/// Reads in a client's request for the Authorization Server to obtain permission from
/// the user to authorize the Client's access of some protected resource(s).
/// </summary>
/// <param name="request">The HTTP request to read from.</param>
/// <returns>The incoming request, or null if no OAuth message was attached.</returns>
/// <exception cref="ProtocolException">Thrown if an unexpected OAuth message is attached to the incoming request.</exception>
public EndUserAuthorizationRequest ReadAuthorizationRequest(HttpRequestInfo request = null) {
if (request == null) {
request = this.Channel.GetRequestFromContext();
}
EndUserAuthorizationRequest message;
this.Channel.TryReadFromRequest(request, out message);
return message;
}
public void ApproveAuthorizationRequest(EndUserAuthorizationRequest authorizationRequest, string username, IEnumerable<string> scopes = null, Uri callback = null) {
Contract.Requires<ArgumentNullException>(authorizationRequest != null, "authorizationRequest");
var response = this.PrepareApproveAuthorizationRequest(authorizationRequest, username, scopes, callback);
this.Channel.Send(response);
}
public void RejectAuthorizationRequest(EndUserAuthorizationRequest authorizationRequest, Uri callback = null) {
Contract.Requires<ArgumentNullException>(authorizationRequest != null, "authorizationRequest");
var response = this.PrepareRejectAuthorizationRequest(authorizationRequest, callback);
this.Channel.Send(response);
}
public bool TryPrepareAccessTokenResponse(out IDirectResponseProtocolMessage response) {
return this.TryPrepareAccessTokenResponse(this.Channel.GetRequestFromContext(), out response);
}
public bool TryPrepareAccessTokenResponse(HttpRequestInfo httpRequestInfo, out IDirectResponseProtocolMessage response) {
Contract.Requires<ArgumentNullException>(httpRequestInfo != null, "httpRequestInfo");
var request = this.ReadAccessTokenRequest(httpRequestInfo);
if (request != null) {
// This convenience method only encrypts access tokens assuming that this auth server
// doubles as the resource server.
RSAParameters resourceServerPublicKey = this.AuthorizationServerServices.AccessTokenSigningPrivateKey;
response = this.PrepareAccessTokenResponse(request, resourceServerPublicKey);
return true;
}
response = null;
return false;
}
public AccessTokenRequestBase ReadAccessTokenRequest(HttpRequestInfo requestInfo = null) {
if (requestInfo == null) {
requestInfo = this.Channel.GetRequestFromContext();
}
AccessTokenRequestBase request;
this.Channel.TryReadFromRequest(requestInfo, out request);
return request;
}
public EndUserAuthorizationFailedResponse PrepareRejectAuthorizationRequest(EndUserAuthorizationRequest authorizationRequest, Uri callback = null) {
Contract.Requires<ArgumentNullException>(authorizationRequest != null, "authorizationRequest");
Contract.Ensures(Contract.Result<EndUserAuthorizationFailedResponse>() != null);
if (callback == null) {
callback = this.GetCallback(authorizationRequest);
}
var response = new EndUserAuthorizationFailedResponse(callback, authorizationRequest);
return response;
}
public EndUserAuthorizationSuccessResponseBase PrepareApproveAuthorizationRequest(EndUserAuthorizationRequest authorizationRequest, string username, IEnumerable<string> scopes = null, Uri callback = null) {
Contract.Requires<ArgumentNullException>(authorizationRequest != null, "authorizationRequest");
Contract.Requires<ArgumentException>(!String.IsNullOrEmpty(username));
Contract.Ensures(Contract.Result<EndUserAuthorizationSuccessResponseBase>() != null);
if (callback == null) {
callback = this.GetCallback(authorizationRequest);
}
var client = this.AuthorizationServerServices.GetClientOrThrow(authorizationRequest.ClientIdentifier);
EndUserAuthorizationSuccessResponseBase response;
switch (authorizationRequest.ResponseType) {
case EndUserAuthorizationResponseType.AccessToken:
response = new EndUserAuthorizationSuccessAccessTokenResponse(callback, authorizationRequest);
break;
case EndUserAuthorizationResponseType.Both:
case EndUserAuthorizationResponseType.AuthorizationCode:
response = new EndUserAuthorizationSuccessAuthCodeResponse(callback, authorizationRequest);
break;
default:
throw ErrorUtilities.ThrowInternal("Unexpected response type.");
}
response.AuthorizingUsername = username;
// Customize the approved scope if the authorization server has decided to do so.
if (scopes != null) {
response.Scope.ResetContents(scopes);
}
return response;
}
/// <summary>
/// Prepares the response to an access token request.
/// </summary>
/// <param name="request">The request for an access token.</param>
/// <param name="accessTokenEncryptingPublicKey">The public key to encrypt the access token to, such that the resource server will be able to decrypt it.</param>
/// <param name="accessTokenLifetime">The access token's lifetime.</param>
/// <param name="includeRefreshToken">If set to <c>true</c>, the response will include a long-lived refresh token.</param>
/// <returns>The response message to send to the client.</returns>
public virtual IDirectResponseProtocolMessage PrepareAccessTokenResponse(AccessTokenRequestBase request, RSAParameters accessTokenEncryptingPublicKey, TimeSpan? accessTokenLifetime = null, bool includeRefreshToken = true) {
Contract.Requires<ArgumentNullException>(request != null, "request");
var tokenRequest = (ITokenCarryingRequest)request;
var accessTokenFormatter = AccessToken.CreateFormatter(this.AuthorizationServerServices.AccessTokenSigningPrivateKey, accessTokenEncryptingPublicKey);
var accessToken = new AccessToken(tokenRequest.AuthorizationDescription, accessTokenLifetime);
var response = new AccessTokenSuccessResponse(request) {
AccessToken = accessTokenFormatter.Serialize(accessToken),
Lifetime = accessToken.Lifetime,
};
response.Scope.ResetContents(tokenRequest.AuthorizationDescription.Scope);
if (includeRefreshToken) {
var refreshTokenFormatter = RefreshToken.CreateFormatter(this.AuthorizationServerServices.Secret);
var refreshToken = new RefreshToken(tokenRequest.AuthorizationDescription);
response.RefreshToken = refreshTokenFormatter.Serialize(refreshToken);
}
return response;
}
protected Uri GetCallback(EndUserAuthorizationRequest authorizationRequest) {
Contract.Requires<ArgumentNullException>(authorizationRequest != null, "authorizationRequest");
Contract.Ensures(Contract.Result<Uri>() != null);
// Prefer a request-specific callback to the pre-registered one (if any).
if (authorizationRequest.Callback != null) {
return authorizationRequest.Callback;
}
var client = this.AuthorizationServerServices.GetClient(authorizationRequest.ClientIdentifier);
if (client.Callback != null) {
return client.Callback;
}
throw ErrorUtilities.ThrowProtocol(OAuthStrings.NoCallback);
}
}
}
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