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 Pithos.Network;
  48 using log4net;
  49
  50 namespace Pithos.Client.WPF
  51 {
  52     using System;
  53     using System.Collections.Generic;
  54     using System.Linq;
  55     using System.Text;
  56     using System.Net;
  57     using System.Threading.Tasks;
  58     using System.Diagnostics.Contracts;
  59     using System.Diagnostics;
  60     using System.Net.Sockets;
  61
  62     /// <summary>
  63     /// TODO: Update summary.
  64     /// </summary>
  65     /// <summary>
  66     /// Retrieves an account name and token from PITHOS
  67     /// </summary>
  68     public static class PithosAccount
  69     {
  70         private static readonly ILog Log = LogManager.GetLogger(typeof(PithosAccount));
  71
  72         /// <summary>
  73         /// Asynchronously retrieves PITHOS credentials
  74         /// </summary>
  75         /// <param name="loginUrl">URL to retrieve the account info from PITHOS. Must end with =</param>
  76         /// <returns>The credentials wrapped in a Task</returns>
  77         public static Task<NetworkCredential> RetrieveCredentials(string loginUrl)
  78         {
  79             Contract.Requires(Uri.IsWellFormedUriString(loginUrl, UriKind.Absolute));
  80
  81             if (!Uri.IsWellFormedUriString(loginUrl, UriKind.Absolute))
  82                 throw new ArgumentException("The pithosSite parameter must be a valid absolute URL", "loginUrl");
  83
  84             int port = GetFreePort();
  85
  86             //TODO:Force logout here to take care of existing cookies
  87
  88
  89             var listenerUrl = String.Format("http://127.0.0.1:{0}/", port);
  90
  91
  92
  93             var receiveCredentials = ListenForRedirectAsync(port);
  94
  95             var logoutUrl = loginUrl.Replace("login", "im/logout");
  96             var logoutProcess=Process.Start(logoutUrl);
  97             TaskEx.Delay(2000).Wait();
  98             var uriBuilder=new UriBuilder(loginUrl);
  99             uriBuilder.Query="next=" + listenerUrl;
 100
 101             var retrieveUri = uriBuilder.Uri;
 102             Log.InfoFormat("[RETRIEVE] Open Browser at {0}", retrieveUri);
 103             Process.Start(retrieveUri.ToString());
 104
 105             return receiveCredentials;
 106         }
 107
 108 /*
 109         private static async Task<NetworkCredential> ListenHttpForRedirectAsync(string listenerUrl)
 110         {
 111             using (var listener = new HttpListener())
 112             {
 113                 listener.Prefixes.Add(listenerUrl);
 114
 115                 Log.InfoFormat("[RETRIEVE] Listening at {0}", listenerUrl);
 116
 117
 118                 try
 119                 {
 120                     listener.Start();
 121
 122                     var context = await listener.GetContextAsync()
 123                                             .WithTimeout(TimeSpan.FromMinutes(5));
 124
 125                     var request = context.Request;
 126                     Log.InfoFormat("[RETRIEVE] Got Connection {0}", request.RawUrl);
 127
 128                     var query = request.QueryString;
 129                     var userName = query["user"];
 130                     var token = query["token"];
 131                     if (String.IsNullOrWhiteSpace(userName) ||
 132                         String.IsNullOrWhiteSpace(token))
 133                     {
 134                         Respond(context, "Failure", "The server did not return a username or token");
 135                         Log.ErrorFormat("[RETRIEVE] No credentials returned by server");
 136                         throw new Exception("The server did not return a username or token");
 137                     }
 138                     else
 139                     {
 140                         Log.InfoFormat("[RETRIEVE] Credentials retrieved user:{0} token:{1}", userName, token);
 141                         Respond(context, "Authenticated", "Got It");
 142
 143                         return new NetworkCredential(userName, token);
 144                     }
 145                 }
 146                 catch (Exception exc)
 147                 {
 148                     Log.Error("[RETRIEVE][ERROR] Receive connection {0}", exc);
 149                     throw;
 150                 }
 151             }
 152         }
 153 */
 154
 155         private static async Task<NetworkCredential> ListenForRedirectAsync(int port)
 156         {
 157             var listener = new TcpListener(IPAddress.Any, port);
 158             Log.InfoFormat("[RETRIEVE] Listening at {0}", port);
 159
 160             try
 161             {
 162                 listener.Start();
 163
 164                 using (var client = await listener.AcceptTcpClientAsync()
 165                                         .WithTimeout(TimeSpan.FromMinutes(5)))
 166                 {
 167                     using (var stream = client.GetStream())
 168                     using (var reader=new StreamReader(stream))
 169                     {
 170                         var request = await reader.ReadLineAsync();
 171                         //BUG
 172                         //TODO: Add proper warnings here if the content is empty, don't just throw an exception
 173                         //This may be a common occurence
 174
 175                         if (String.IsNullOrWhiteSpace(request))
 176                             throw new PithosException("The server did send any information");
 177                         Log.InfoFormat("[RETRIEVE] Got Connection {0}", request);
 178
 179
 180                         var items = ParseResponse(request);
 181
 182                         var userName = items["user"];
 183                         var token = items["token"];
 184                         if (String.IsNullOrWhiteSpace(userName) ||
 185                             String.IsNullOrWhiteSpace(token))
 186                         {
 187                             Respond(stream, "Failure", "The server did not return a username or token");
 188                             Log.ErrorFormat("[RETRIEVE] No credentials returned by server");
 189                             throw new PithosException("The server did not return a username or token");
 190                         }
 191                         else
 192                         {
 193                             Log.InfoFormat("[RETRIEVE] Credentials retrieved user:{0} token:{1}", userName, token);
 194                             Respond(stream, "Authenticated", "Got It");
 195                         }
 196                         return new NetworkCredential(userName, token);
 197                     }
 198                 }
 199             }
 200             catch (Exception exc)
 201             {
 202                 Log.Error("[RETRIEVE][ERROR] Receive connection {0}", exc);
 203                 throw new PithosException("An error occured while retrieving credentials",exc);
 204             }
 205         }
 206
 207         private static Dictionary<string, string> ParseResponse(string request)
 208         {
 209             var parts = request.Split(' ');
 210             var query = parts[1].TrimStart('/', '?');
 211
 212             var items = query.Split('&')
 213                 .Select(pair => pair.Split('='))
 214                 .ToDictionary(arr => arr[0].ToLower(), arr => Uri.UnescapeDataString(arr[1]));
 215             return items;
 216         }
 217
 218
 219         private static void Respond(HttpListenerContext context,string title,string message)
 220         {
 221             var response = context.Response;
 222             var html = String.Format("<html><head><title>{0}</title></head><body><h1>{1}</h1></body></html>", title, message);
 223             var outBuffer = Encoding.UTF8.GetBytes(html);
 224             response.ContentLength64 = outBuffer.Length;
 225             using (var stream = response.OutputStream)
 226             {
 227                 stream.Write(outBuffer, 0, outBuffer.Length);
 228             }
 229
 230             Log.InfoFormat("[RETRIEVE] Responded");
 231         }
 232
 233         private static void Respond(Stream stream,string title,string message)
 234         {
 235
 236             var html = String.Format("<html><head><title>{0}</title></head><body><h1>{1}</h1></body></html>", title, message);
 237
 238             var response = new StringBuilder();
 239             response.AppendLine("HTTP/1.1 200 OK");
 240             response.AppendFormat("Content-Length: {0}\n", html.Length);
 241             response.AppendLine("Server: Microsoft-HTTPAPI/2.0");
 242             response.AppendFormat("Date: {0}\n\n", DateTime.UtcNow);
 243             response.AppendLine(html);
 244
 245             var outBuffer=Encoding.UTF8.GetBytes(response.ToString());
 246
 247             stream.Write(outBuffer, 0, outBuffer.Length);
 248
 249             Log.InfoFormat("[RETRIEVE] Responded");
 250         }
 251
 252
 253         /// <summary>
 254         /// Locates a free local port
 255         /// </summary>
 256         /// <returns>A free port</returns>
 257         /// <remarks>The method starts and stops a TcpListener on port 0 to locate a free port.</remarks>
 258         public static int GetFreePort()
 259         {
 260             //The TcpListener will locate a free port
 261             var listener = new TcpListener(IPAddress.Any, 0);
 262             listener.Start();
 263             var port = ((IPEndPoint)listener.LocalEndpoint).Port;
 264             listener.Stop();
 265             return port;
 266         }
 267     }
 268 }