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//-----------------------------------------------------------------------
// <copyright file="HostedProvider.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenIdOfflineProvider {
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Net;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OpenId.Provider;
/// <summary>
/// The OpenID Provider host.
/// </summary>
internal class HostedProvider : IDisposable {
/// <summary>
/// The path to the Provider Endpoint.
/// </summary>
private const string ProviderPath = "/provider";
/// <summary>
/// The path to the OP Identifier.
/// </summary>
private const string OPIdentifier = "/";
/// <summary>
/// The path to the user identity page that always generates a positive assertion.
/// </summary>
private const string YesIdentity = "/user";
/// <summary>
/// The path to the user identity page that always generates a negative response.
/// </summary>
private const string NoIdentity = "/no";
/// <summary>
/// The <see cref="OpenIdProvider"/> instance that processes incoming requests.
/// </summary>
private OpenIdProvider provider = new OpenIdProvider(new StandardProviderApplicationStore());
/// <summary>
/// The HTTP listener that acts as the OpenID Provider socket.
/// </summary>
private HttpHost httpHost;
/// <summary>
/// Initializes a new instance of the <see cref="HostedProvider"/> class.
/// </summary>
internal HostedProvider() {
this.AffirmativeIdentities = new HashSet<Uri>();
this.NegativeIdentities = new HashSet<Uri>();
}
/// <summary>
/// Gets a value indicating whether this instance is running.
/// </summary>
/// <value>
/// <c>true</c> if this instance is running; otherwise, <c>false</c>.
/// </value>
internal bool IsRunning {
get { return this.httpHost != null; }
}
/// <summary>
/// Gets a collection of identity URLs that always produce positive assertions.
/// </summary>
internal ICollection<Uri> AffirmativeIdentities { get; private set; }
/// <summary>
/// Gets a collection of identity URLs that always produce cancellation responses.
/// </summary>
internal ICollection<Uri> NegativeIdentities { get; private set; }
/// <summary>
/// Gets the <see cref="OpenIdProvider"/> instance that processes incoming requests.
/// </summary>
internal OpenIdProvider Provider {
get { return this.provider; }
}
/// <summary>
/// Gets the provider endpoint.
/// </summary>
internal Uri ProviderEndpoint {
get {
Contract.Requires(this.IsRunning);
return new Uri(this.httpHost.BaseUri, ProviderPath);
}
}
/// <summary>
/// Gets or sets the delegate that handles authentication requests.
/// </summary>
internal Action<IAuthenticationRequest> ProcessAuthenticationRequest { get; set; }
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose() {
this.Dispose(true);
}
/// <summary>
/// Starts the provider.
/// </summary>
internal void StartProvider() {
Contract.Ensures(this.IsRunning);
this.httpHost = HttpHost.CreateHost(this.RequestHandler);
this.AffirmativeIdentities.Add(new Uri(this.httpHost.BaseUri, YesIdentity));
this.NegativeIdentities.Add(new Uri(this.httpHost.BaseUri, NoIdentity));
}
/// <summary>
/// Stops the provider.
/// </summary>
internal void StopProvider() {
Contract.Ensures(!this.IsRunning);
if (this.httpHost != null) {
this.httpHost.Dispose();
this.httpHost = null;
}
}
#region IDisposable Members
/// <summary>
/// Releases unmanaged and - optionally - managed resources
/// </summary>
/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing) {
if (disposing) {
var host = this.httpHost as IDisposable;
if (host != null) {
host.Dispose();
}
this.httpHost = null;
}
}
#endregion
/// <summary>
/// Generates HTML for an identity page.
/// </summary>
/// <param name="providerEndpoint">The provider endpoint.</param>
/// <param name="localId">The local id.</param>
/// <returns>The HTML document to return to the RP.</returns>
private static string GenerateHtmlDiscoveryDocument(string providerEndpoint, string localId) {
Contract.Requires(providerEndpoint != null && providerEndpoint.Length > 0);
const string DelegatedHtmlDiscoveryFormat = @"<html><head>
<link rel=""openid.server"" href=""{0}"" />
<link rel=""openid.delegate"" href=""{1}"" />
<link rel=""openid2.provider"" href=""{0}"" />
<link rel=""openid2.local_id"" href=""{1}"" />
</head><body></body></html>";
const string NonDelegatedHtmlDiscoveryFormat = @"<html><head>
<link rel=""openid.server"" href=""{0}"" />
<link rel=""openid2.provider"" href=""{0}"" />
</head><body></body></html>";
return string.Format(
localId != null ? DelegatedHtmlDiscoveryFormat : NonDelegatedHtmlDiscoveryFormat,
providerEndpoint,
localId);
}
/// <summary>
/// Handles incoming HTTP requests.
/// </summary>
/// <param name="context">The HttpListener context.</param>
private void RequestHandler(HttpListenerContext context) {
Contract.Requires(context != null);
Contract.Requires(context.Response.OutputStream != null);
Contract.Requires(this.ProcessAuthenticationRequest != null);
Stream outputStream = context.Response.OutputStream;
Contract.Assume(outputStream != null); // CC static verification shortcoming.
if (context.Request.Url.AbsolutePath == ProviderPath) {
HttpRequestInfo requestInfo = new HttpRequestInfo(context.Request);
IRequest providerRequest = this.Provider.GetRequest(requestInfo);
if (providerRequest == null) {
App.Logger.Error("A request came in that did not carry an OpenID message.");
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
using (StreamWriter sw = new StreamWriter(outputStream)) {
sw.WriteLine("<html><body>This is an OpenID Provider endpoint.</body></html>");
}
return;
}
if (!providerRequest.IsResponseReady) {
var authRequest = (IAuthenticationRequest)providerRequest;
this.ProcessAuthenticationRequest(authRequest);
}
this.Provider.PrepareResponse(providerRequest).Send(context.Response);
} else if (context.Request.Url.AbsolutePath == YesIdentity || context.Request.Url.AbsolutePath == NoIdentity) {
using (StreamWriter sw = new StreamWriter(outputStream)) {
string providerEndpoint = string.Format("http://localhost:{0}{1}", context.Request.Url.Port, ProviderPath);
string localId = null; // string.Format("http://localhost:{0}/user", context.Request.Url.Port);
string html = GenerateHtmlDiscoveryDocument(providerEndpoint, localId);
sw.WriteLine(html);
}
context.Response.StatusCode = (int)HttpStatusCode.OK;
context.Response.OutputStream.Close();
} else {
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
context.Response.OutputStream.Close();
}
}
}
}
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