code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Client.WPF/PithosAccount.cs

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="PithosAccount.cs" company="GRNet">
   4  *
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  *   1. Redistributions of source code must retain the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer.
  14  *
  15  *   2. Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials
  18  *      provided with the distribution.
  19  *
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * The views and conclusions contained in the software and
  35  * documentation are those of the authors and should not be
  36  * interpreted as representing official policies, either expressed
  37  * or implied, of GRNET S.A.
  38  * </copyright>
  39  * -----------------------------------------------------------------------
  40  */
  41 #endregion
  42
  43 // </copyright>
  44 // -----------------------------------------------------------------------
  45
  46 using System.IO;
  47 using System.Reflection;
  48 using Pithos.Network;
  49 using log4net;
  50
  51 namespace Pithos.Client.WPF
  52 {
  53     using System;
  54     using System.Collections.Generic;
  55     using System.Linq;
  56     using System.Text;
  57     using System.Net;
  58     using System.Threading.Tasks;
  59     using System.Diagnostics.Contracts;
  60     using System.Diagnostics;
  61     using System.Net.Sockets;
  62
  63     /// <summary>
  64     /// TODO: Update summary.
  65     /// </summary>
  66     /// <summary>
  67     /// Retrieves an account name and token from PITHOS
  68     /// </summary>
  69     public static class PithosAccount
  70     {
  71         private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
  72
  73         /// <summary>
  74         /// Asynchronously retrieves PITHOS credentials
  75         /// </summary>
  76         /// <param name="loginUrl">URL to retrieve the account info from PITHOS. Must end with =</param>
  77         /// <returns>The credentials wrapped in a Task</returns>
  78         public static Task<NetworkCredential> RetrieveCredentials(string loginUrl)
  79         {
  80             Contract.Requires(Uri.IsWellFormedUriString(loginUrl, UriKind.Absolute));
  81
  82             if (!Uri.IsWellFormedUriString(loginUrl, UriKind.Absolute))
  83                 throw new ArgumentException("The pithosSite parameter must be a valid absolute URL", "loginUrl");
  84
  85             int port = GetFreePort();
  86
  87             //TODO:Force logout here to take care of existing cookies
  88
  89
  90             var listenerUrl = String.Format("http://127.0.0.1:{0}/", port);
  91
  92
  93
  94             var receiveCredentials = ListenForRedirectAsync(port);
  95
  96             var logoutUrl = loginUrl.Replace("login", "im/logout");
  97             var logoutProcess=Process.Start(logoutUrl);
  98             TaskEx.Delay(2000).Wait();
  99             var uriBuilder=new UriBuilder(loginUrl);
 100             uriBuilder.Query="next=" + listenerUrl;
 101
 102             var retrieveUri = uriBuilder.Uri;
 103             Log.InfoFormat("[RETRIEVE] Open Browser at {0}", retrieveUri);
 104             Process.Start(retrieveUri.ToString());
 105
 106             return receiveCredentials;
 107         }
 108
 109 /*
 110         private static async Task<NetworkCredential> ListenHttpForRedirectAsync(string listenerUrl)
 111         {
 112             using (var listener = new HttpListener())
 113             {
 114                 listener.Prefixes.Add(listenerUrl);
 115
 116                 Log.InfoFormat("[RETRIEVE] Listening at {0}", listenerUrl);
 117
 118
 119                 try
 120                 {
 121                     listener.Start();
 122
 123                     var context = await listener.GetContextAsync()
 124                                             .WithTimeout(TimeSpan.FromMinutes(5));
 125
 126                     var request = context.Request;
 127                     Log.InfoFormat("[RETRIEVE] Got Connection {0}", request.RawUrl);
 128
 129                     var query = request.QueryString;
 130                     var userName = query["user"];
 131                     var token = query["token"];
 132                     if (String.IsNullOrWhiteSpace(userName) ||
 133                         String.IsNullOrWhiteSpace(token))
 134                     {
 135                         Respond(context, "Failure", "The server did not return a username or token");
 136                         Log.ErrorFormat("[RETRIEVE] No credentials returned by server");
 137                         throw new Exception("The server did not return a username or token");
 138                     }
 139                     else
 140                     {
 141                         Log.InfoFormat("[RETRIEVE] Credentials retrieved user:{0} token:{1}", userName, token);
 142                         Respond(context, "Authenticated", "Got It");
 143
 144                         return new NetworkCredential(userName, token);
 145                     }
 146                 }
 147                 catch (Exception exc)
 148                 {
 149                     Log.Error("[RETRIEVE][ERROR] Receive connection {0}", exc);
 150                     throw;
 151                 }
 152             }
 153         }
 154 */
 155
 156         private static async Task<NetworkCredential> ListenForRedirectAsync(int port)
 157         {
 158             var listener = new TcpListener(IPAddress.Any, port);
 159             Log.InfoFormat("[RETRIEVE] Listening at {0}", port);
 160
 161             try
 162             {
 163                 listener.Start();
 164
 165                 using (var client = await listener.AcceptTcpClientAsync()
 166                                         .WithTimeout(TimeSpan.FromMinutes(5)))
 167                 {
 168                     using (var stream = client.GetStream())
 169                     using (var reader=new StreamReader(stream))
 170                     {
 171                         var request = await reader.ReadLineAsync();
 172                         //BUG
 173                         //TODO: Add proper warnings here if the content is empty, don't just throw an exception
 174                         //This may be a common occurence
 175
 176                         if (String.IsNullOrWhiteSpace(request))
 177                             throw new PithosException("The server did send any information");
 178                         Log.InfoFormat("[RETRIEVE] Got Connection {0}", request);
 179
 180
 181                         var items = ParseResponse(request);
 182
 183                         var userName = items["user"];
 184                         var token = items["token"];
 185                         if (String.IsNullOrWhiteSpace(userName) ||
 186                             String.IsNullOrWhiteSpace(token))
 187                         {
 188                             Respond(stream, "Failure", "The server did not return a username or token");
 189                             Log.ErrorFormat("[RETRIEVE] No credentials returned by server");
 190                             throw new PithosException("The server did not return a username or token");
 191                         }
 192                         else
 193                         {
 194                             Log.InfoFormat("[RETRIEVE] Credentials retrieved user:{0} token:{1}", userName, token);
 195                             Respond(stream, "Authenticated", "Got It");
 196                         }
 197                         return new NetworkCredential(userName, token);
 198                     }
 199                 }
 200             }
 201             catch (Exception exc)
 202             {
 203                 Log.Error("[RETRIEVE][ERROR] Receive connection {0}", exc);
 204                 throw new PithosException("An error occured while retrieving credentials",exc);
 205             }
 206         }
 207
 208         private static Dictionary<string, string> ParseResponse(string request)
 209         {
 210             var parts = request.Split(' ');
 211             var query = parts[1].TrimStart('/', '?');
 212
 213             var items = query.Split('&')
 214                 .Select(pair => pair.Split('='))
 215                 .ToDictionary(arr => arr[0].ToLower(), arr => Uri.UnescapeDataString(arr[1]));
 216             return items;
 217         }
 218
 219
 220         private static void Respond(HttpListenerContext context,string title,string message)
 221         {
 222             var response = context.Response;
 223             var html = String.Format("<html><head><title>{0}</title></head><body><h1>{1}</h1></body></html>", title, message);
 224             var outBuffer = Encoding.UTF8.GetBytes(html);
 225             response.ContentLength64 = outBuffer.Length;
 226             using (var stream = response.OutputStream)
 227             {
 228                 stream.Write(outBuffer, 0, outBuffer.Length);
 229             }
 230
 231             Log.InfoFormat("[RETRIEVE] Responded");
 232         }
 233
 234         private static void Respond(Stream stream,string title,string message)
 235         {
 236
 237             var html = String.Format("<html><head><title>{0}</title></head><body><h1>{1}</h1></body></html>", title, message);
 238
 239             var response = new StringBuilder();
 240             response.AppendLine("HTTP/1.1 200 OK");
 241             response.AppendFormat("Content-Length: {0}\n", html.Length);
 242             response.AppendLine("Server: Microsoft-HTTPAPI/2.0");
 243             response.AppendFormat("Date: {0}\n\n", DateTime.UtcNow);
 244             response.AppendLine(html);
 245
 246             var outBuffer=Encoding.UTF8.GetBytes(response.ToString());
 247
 248             stream.Write(outBuffer, 0, outBuffer.Length);
 249
 250             Log.InfoFormat("[RETRIEVE] Responded");
 251         }
 252
 253
 254         /// <summary>
 255         /// Locates a free local port
 256         /// </summary>
 257         /// <returns>A free port</returns>
 258         /// <remarks>The method starts and stops a TcpListener on port 0 to locate a free port.</remarks>
 259         public static int GetFreePort()
 260         {
 261             //The TcpListener will locate a free port
 262             var listener = new TcpListener(IPAddress.Any, 0);
 263             listener.Start();
 264             var port = ((IPEndPoint)listener.LocalEndpoint).Port;
 265             listener.Stop();
 266             return port;
 267         }
 268     }
 269 }