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

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="ShellViewModel.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 using System.Collections.Concurrent;
  43 using System.Diagnostics;
  44 using System.Diagnostics.Contracts;
  45 using System.IO;
  46 using System.Net;
  47 using System.Reflection;
  48 using System.Runtime.InteropServices;
  49 using System.ServiceModel;
  50 using System.Threading.Tasks;
  51 using System.Windows;
  52 using System.Windows.Controls.Primitives;
  53 using Caliburn.Micro;
  54 using Hardcodet.Wpf.TaskbarNotification;
  55 using Pithos.Client.WPF.Configuration;
  56 using Pithos.Client.WPF.FileProperties;
  57 using Pithos.Client.WPF.Preferences;
  58 using Pithos.Client.WPF.Properties;
  59 using Pithos.Client.WPF.SelectiveSynch;
  60 using Pithos.Client.WPF.Services;
  61 using Pithos.Client.WPF.Shell;
  62 using Pithos.Core;
  63 using Pithos.Core.Agents;
  64 using Pithos.Interfaces;
  65 using System;
  66 using System.Collections.Generic;
  67 using System.Linq;
  68 using Pithos.Network;
  69 using StatusService = Pithos.Client.WPF.Services.StatusService;
  70
  71 namespace Pithos.Client.WPF {
  72         using System.ComponentModel.Composition;
  73
  74
  75         ///<summary>
  76         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  77         /// The shell also hosts the status service called by shell extensions to retrieve file info
  78         ///</summary>
  79         ///<remarks>
  80         /// It is a strange "shell" as its main visible element is an icon instead of a window
  81         /// The shell subscribes to the following events:
  82         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  83         /// * SelectiveSynchChanges: Notifies that the user made changes to the selective synch folders for an account. Raised by the Selective Synch dialog. Located here because the monitors are here
  84         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  85         ///</remarks>
  86         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  87         [Export(typeof(IShell))]
  88         public class ShellViewModel : Screen, IStatusNotification, IShell,
  89                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  90         {
  91                 //The Status Checker provides the current synch state
  92                 //TODO: Could we remove the status checker and use events in its place?
  93                 private readonly IStatusChecker _statusChecker;
  94                 private readonly IEventAggregator _events;
  95
  96                 public PithosSettings Settings { get; private set; }
  97
  98
  99                 private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
 100                 ///<summary>
 101                 /// Dictionary of account monitors, keyed by account
 102                 ///</summary>
 103                 ///<remarks>
 104                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
 105                 /// retrieve account and boject info
 106                 ///</remarks>
 107                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
 108                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
 109                 public ConcurrentDictionary<string, PithosMonitor> Monitors
 110                 {
 111                         get { return _monitors; }
 112                 }
 113
 114
 115                 ///<summary>
 116                 /// The status service is used by Shell extensions to retrieve file status information
 117                 ///</summary>
 118                 //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
 119                 private ServiceHost _statusService;
 120
 121                 //Logging in the Pithos client is provided by log4net
 122                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
 123
 124                 //Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
 125                 private Lazy<FileVersionInfo> _fileVersion;
 126
 127             private PollAgent _pollAgent;
 128
 129                 ///<summary>
 130                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
 131                 ///</summary>
 132                 ///<remarks>
 133                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
 134                 ///</remarks>
 135                 [ImportingConstructor]
 136                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings,PollAgent pollAgent)
 137                 {
 138                         try
 139                         {
 140
 141                                 _windowManager = windowManager;
 142                                 //CHECK: Caliburn doesn't need explicit command construction
 143                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
 144                                 _statusChecker = statusChecker;
 145                                 //The event subst
 146                                 _events = events;
 147                                 _events.Subscribe(this);
 148
 149                             _pollAgent = pollAgent;
 150                                 Settings = settings;
 151
 152                                 Proxy.SetFromSettings(settings);
 153
 154                                 StatusMessage = "In Synch";
 155
 156                                 _fileVersion=  new Lazy<FileVersionInfo>(() =>
 157                                 {
 158                                         Assembly assembly = Assembly.GetExecutingAssembly();
 159                                         var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 160                                         return fileVersion;
 161                                 });
 162                                 _accounts.CollectionChanged += (sender, e) =>
 163                                                                                                    {
 164                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 165                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 166                                                                                                    };
 167
 168                         }
 169                         catch (Exception exc)
 170                         {
 171                                 Log.Error("Error while starting the ShellViewModel",exc);
 172                                 throw;
 173                         }
 174                 }
 175
 176
 177                 protected override void OnActivate()
 178                 {
 179                         base.OnActivate();
 180
 181
 182
 183                         StartMonitoring();
 184                 }
 185
 186
 187
 188                 private async void StartMonitoring()
 189                 {
 190                         try
 191                         {
 192                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 193                                 await TaskEx.WhenAll(accounts);
 194                                 _statusService = StatusService.Start();
 195
 196 /*
 197                                 foreach (var account in Settings.Accounts)
 198                                 {
 199                                         await MonitorAccount(account);
 200                                 }
 201 */
 202
 203                         }
 204                         catch (AggregateException exc)
 205                         {
 206                                 exc.Handle(e =>
 207                                 {
 208                                         Log.Error("Error while starting monitoring", e);
 209                                         return true;
 210                                 });
 211                                 throw;
 212                         }
 213                 }
 214
 215                 protected override void OnDeactivate(bool close)
 216                 {
 217                         base.OnDeactivate(close);
 218                         if (close)
 219                         {
 220                                 StatusService.Stop(_statusService);
 221                                 _statusService = null;
 222                         }
 223                 }
 224
 225                 public Task MonitorAccount(AccountSettings account)
 226                 {
 227                         return Task.Factory.StartNew(() =>
 228                         {
 229                                 PithosMonitor monitor;
 230                                 var accountName = account.AccountName;
 231
 232                                 if (_monitors.TryGetValue(accountName, out monitor))
 233                                 {
 234                                         //If the account is active
 235                                         if (account.IsActive)
 236                                                 //Start the monitor. It's OK to start an already started monitor,
 237                                                 //it will just ignore the call
 238                                                 StartMonitor(monitor).Wait();
 239                                         else
 240                                         {
 241                                                 //If the account is inactive
 242                                                 //Stop and remove the monitor
 243                                                 RemoveMonitor(accountName);
 244                                         }
 245                                         return;
 246                                 }
 247
 248
 249                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 250                                 monitor = new PithosMonitor
 251                                                           {
 252                                                                   UserName = accountName,
 253                                                                   ApiKey = account.ApiKey,
 254                                                                   StatusNotification = this,
 255                                                                   RootPath = account.RootPath
 256                                                           };
 257                                 //PithosMonitor uses MEF so we need to resolve it
 258                                 IoC.BuildUp(monitor);
 259
 260                                 monitor.AuthenticationUrl = account.ServerUrl;
 261
 262                                 _monitors[accountName] = monitor;
 263
 264                                 if (account.IsActive)
 265                                 {
 266                                         //Don't start a monitor if it doesn't have an account and ApiKey
 267                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 268                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 269                                                 return;
 270                                         StartMonitor(monitor);
 271                                 }
 272                         });
 273                 }
 274
 275
 276                 protected override void OnViewLoaded(object view)
 277                 {
 278                         UpdateStatus();
 279                         var window = (Window)view;
 280                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 281                         base.OnViewLoaded(view);
 282                 }
 283
 284
 285                 #region Status Properties
 286
 287                 private string _statusMessage;
 288                 public string StatusMessage
 289                 {
 290                         get { return _statusMessage; }
 291                         set
 292                         {
 293                                 _statusMessage = value;
 294                                 NotifyOfPropertyChange(() => StatusMessage);
 295                         }
 296                 }
 297
 298                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 299                 public ObservableConcurrentCollection<AccountInfo> Accounts
 300                 {
 301                         get { return _accounts; }
 302                 }
 303
 304                 public bool HasAccounts
 305                 {
 306                         get { return _accounts.Count > 0; }
 307                 }
 308
 309
 310                 public string OpenFolderCaption
 311                 {
 312                         get
 313                         {
 314                                 return (_accounts.Count == 0)
 315                                                 ? "No Accounts Defined"
 316                                                 : "Open Pithos Folder";
 317                         }
 318                 }
 319
 320                 private string _pauseSyncCaption="Pause Synching";
 321                 public string PauseSyncCaption
 322                 {
 323                         get { return _pauseSyncCaption; }
 324                         set
 325                         {
 326                                 _pauseSyncCaption = value;
 327                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 328                         }
 329                 }
 330
 331                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 332                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 333                 {
 334                         get { return _recentFiles; }
 335                 }
 336
 337
 338                 private string _statusIcon="../Images/Pithos.ico";
 339                 public string StatusIcon
 340                 {
 341                         get { return _statusIcon; }
 342                         set
 343                         {
 344                                 //TODO: Ensure all status icons use the Pithos logo
 345                                 _statusIcon = value;
 346                                 NotifyOfPropertyChange(() => StatusIcon);
 347                         }
 348                 }
 349
 350                 #endregion
 351
 352                 #region Commands
 353
 354         public void ShowPreferences()
 355         {
 356             ShowPreferences(null);
 357         }
 358
 359                 public void ShowPreferences(string currentTab)
 360                 {
 361                         //Settings.Reload();
 362                     var preferences = new PreferencesViewModel(_windowManager, _events, this, Settings,currentTab);
 363                     _windowManager.ShowDialog(preferences);
 364
 365                 }
 366
 367                 public void AboutPithos()
 368                 {
 369                         var about = new AboutViewModel();
 370                         _windowManager.ShowWindow(about);
 371                 }
 372
 373                 public void SendFeedback()
 374                 {
 375                         var feedBack =  IoC.Get<FeedbackViewModel>();
 376                         _windowManager.ShowWindow(feedBack);
 377                 }
 378
 379                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 380
 381                 public void OpenPithosFolder()
 382                 {
 383                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 384                         if (account == null)
 385                                 return;
 386                         Process.Start(account.RootPath);
 387                 }
 388
 389                 public void OpenPithosFolder(AccountInfo account)
 390                 {
 391                         Process.Start(account.AccountPath);
 392                 }
 393
 394
 395 /*
 396                 public void GoToSite()
 397                 {
 398                         var site = Properties.Settings.Default.PithosSite;
 399                         Process.Start(site);
 400                 }
 401 */
 402
 403                 public void GoToSite(AccountInfo account)
 404                 {
 405                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 406                                 account.SiteUri,account.Token,
 407                                 account.UserName);*/
 408                         Process.Start(account.SiteUri);
 409                 }
 410
 411                 public void ShowFileProperties()
 412                 {
 413                         var account = Settings.Accounts.First(acc => acc.IsActive);
 414                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 415                         var files=dir.GetFiles();
 416                         var r=new Random();
 417                         var idx=r.Next(0, files.Length);
 418                         ShowFileProperties(files[idx].FullName);
 419                 }
 420
 421                 public void ShowFileProperties(string filePath)
 422                 {
 423                         if (String.IsNullOrWhiteSpace(filePath))
 424                                 throw new ArgumentNullException("filePath");
 425                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 426                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 427                         Contract.EndContractBlock();
 428
 429                         var pair=(from monitor in  Monitors
 430                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 431                                                                    select monitor).FirstOrDefault();
 432                         var accountMonitor = pair.Value;
 433
 434                         if (accountMonitor == null)
 435                                 return;
 436
 437                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 438
 439
 440
 441                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 442                         _windowManager.ShowWindow(fileProperties);
 443                 }
 444
 445                 public void ShowContainerProperties()
 446                 {
 447                         var account = Settings.Accounts.First(acc => acc.IsActive);
 448                         var dir = new DirectoryInfo(account.RootPath);
 449                         var fullName = (from folder in dir.EnumerateDirectories()
 450                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 451                                                         select folder.FullName).First();
 452                         ShowContainerProperties(fullName);
 453                 }
 454
 455                 public void ShowContainerProperties(string filePath)
 456                 {
 457                         if (String.IsNullOrWhiteSpace(filePath))
 458                                 throw new ArgumentNullException("filePath");
 459                         if (!Directory.Exists(filePath))
 460                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 461                         Contract.EndContractBlock();
 462
 463                         var pair=(from monitor in  Monitors
 464                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 465                                                                    select monitor).FirstOrDefault();
 466                         var accountMonitor = pair.Value;
 467                         var info = accountMonitor.GetContainerInfo(filePath);
 468
 469
 470
 471                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 472                         _windowManager.ShowWindow(containerProperties);
 473                 }
 474
 475                 public void SynchNow()
 476                 {
 477                         _pollAgent.SynchNow();
 478                 }
 479
 480                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 481                 {
 482                         if (currentInfo==null)
 483                                 throw new ArgumentNullException("currentInfo");
 484                         Contract.EndContractBlock();
 485
 486                         var monitor = Monitors[currentInfo.Account];
 487                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 488                         return newInfo;
 489                 }
 490
 491                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 492                 {
 493                         if (container == null)
 494                                 throw new ArgumentNullException("container");
 495                         Contract.EndContractBlock();
 496
 497                         var monitor = Monitors[container.Account];
 498                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 499                         return newInfo;
 500                 }
 501
 502
 503                 public void ToggleSynching()
 504                 {
 505                         bool isPaused=false;
 506                         foreach (var pair in Monitors)
 507                         {
 508                                 var monitor = pair.Value;
 509                                 monitor.Pause = !monitor.Pause;
 510                                 isPaused = monitor.Pause;
 511                         }
 512
 513                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 514                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 515                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 516                 }
 517
 518                 public void ExitPithos()
 519                 {
 520                         foreach (var pair in Monitors)
 521                         {
 522                                 var monitor = pair.Value;
 523                                 monitor.Stop();
 524                         }
 525
 526                         ((Window)GetView()).Close();
 527                 }
 528                 #endregion
 529
 530
 531                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 532                         {
 533                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 534                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 535                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 536                         }.ToDictionary(s => s.Status);
 537
 538                 readonly IWindowManager _windowManager;
 539
 540
 541                 ///<summary>
 542                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 543                 ///</summary>
 544                 public void UpdateStatus()
 545                 {
 546                         var pithosStatus = _statusChecker.GetPithosStatus();
 547
 548                         if (_iconNames.ContainsKey(pithosStatus))
 549                         {
 550                                 var info = _iconNames[pithosStatus];
 551                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 552
 553
 554
 555                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
 556                         }
 557
 558                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 559                 }
 560
 561
 562
 563                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 564                 {
 565                         return Task.Factory.StartNew(() =>
 566                         {
 567                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 568                                 {
 569                                         try
 570                                         {
 571                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 572
 573                                                 monitor.Start();
 574                                         }
 575                                         catch (WebException exc)
 576                                         {
 577                                                 if (AbandonRetry(monitor, retries))
 578                                                         return;
 579
 580                                                 HttpStatusCode statusCode =HttpStatusCode.OK;
 581                                                 var response = exc.Response as HttpWebResponse;
 582                                                 if(response!=null)
 583                                                         statusCode = response.StatusCode;
 584
 585                                                 switch (statusCode)
 586                                                 {
 587                                                         case HttpStatusCode.Unauthorized:
 588                                                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 589                                                                                                                         monitor.UserName);
 590                                                                 Log.Error(message, exc);
 591                                                         var account = Settings.Accounts.Find(acc => acc.AccountName == monitor.UserName);
 592                                                         account.IsExpired = true;
 593                                 Notify(new ExpirationNotification(account));
 594                                                                 //TryAuthorize(monitor.UserName, retries).Wait();
 595                                                                 break;
 596                                                         case HttpStatusCode.ProxyAuthenticationRequired:
 597                                                                 TryAuthenticateProxy(monitor,retries);
 598                                                                 break;
 599                                                         default:
 600                                                                 TryLater(monitor, exc, retries);
 601                                                                 break;
 602                                                 }
 603                                         }
 604                                         catch (Exception exc)
 605                                         {
 606                                                 if (AbandonRetry(monitor, retries))
 607                                                         return;
 608
 609                                                 TryLater(monitor,exc,retries);
 610                                         }
 611                                 }
 612                         });
 613                 }
 614
 615                 private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 616                 {
 617                         Execute.OnUIThread(() =>
 618                                                                    {
 619                                                                            var proxyAccount = IoC.Get<ProxyAccountViewModel>();
 620                                                                                 proxyAccount.Settings = this.Settings;
 621                                                                            if (true != _windowManager.ShowDialog(proxyAccount))
 622                                                                                    return;
 623                                                                            StartMonitor(monitor, retries);
 624                                                                            NotifyOfPropertyChange(() => Accounts);
 625                                                                    });
 626                 }
 627
 628                 private bool AbandonRetry(PithosMonitor monitor, int retries)
 629                 {
 630                         if (retries > 1)
 631                         {
 632                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 633                                                                                         monitor.UserName);
 634                                 _events.Publish(new Notification
 635                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 636                                 return true;
 637                         }
 638                         return false;
 639                 }
 640
 641
 642
 643                 private static bool IsUnauthorized(WebException exc)
 644                 {
 645                         if (exc==null)
 646                                 throw new ArgumentNullException("exc");
 647                         Contract.EndContractBlock();
 648
 649                         var response = exc.Response as HttpWebResponse;
 650                         if (response == null)
 651                                 return false;
 652                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 653                 }
 654
 655                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 656                 {
 657                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 658                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 659                         _events.Publish(new Notification
 660                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 661                         Log.Error(message, exc);
 662                 }
 663
 664
 665                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 666                 {
 667                         StatusMessage = status;
 668
 669                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 670                 }
 671
 672                 public void NotifyChangedFile(string filePath)
 673                 {
 674                         var entry = new FileEntry {FullPath=filePath};
 675                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 676                         FileEntry popped;
 677                         while (files.Count > 5)
 678                                 files.TryTake(out popped);
 679                         files.TryAdd(entry);
 680                 }
 681
 682                 public void NotifyAccount(AccountInfo account)
 683                 {
 684                         if (account== null)
 685                                 return;
 686                         //TODO: What happens to an existing account whose Token has changed?
 687                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 688                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 689                                 Uri.EscapeDataString(account.UserName));
 690
 691                         if (Accounts.All(item => item.UserName != account.UserName))
 692                                 Accounts.TryAdd(account);
 693
 694                 }
 695
 696                 public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 697                 {
 698                         if (conflictFiles == null)
 699                                 return;
 700                         if (!conflictFiles.Any())
 701                                 return;
 702
 703                         UpdateStatus();
 704                         //TODO: Create a more specific message. For now, just show a warning
 705                         NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 706
 707                 }
 708
 709                 public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 710                 {
 711                         if (files == null)
 712                                 return;
 713                         if (!files.Any())
 714                                 return;
 715
 716                         StatusMessage = message;
 717
 718                         _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 719                 }
 720
 721                 public void Notify(Notification notification)
 722                 {
 723                         _events.Publish(notification);
 724                 }
 725
 726
 727                 public void RemoveMonitor(string accountName)
 728                 {
 729                         if (String.IsNullOrWhiteSpace(accountName))
 730                                 return;
 731
 732                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 733                         _accounts.TryRemove(accountInfo);
 734
 735                         PithosMonitor monitor;
 736                         if (Monitors.TryRemove(accountName, out monitor))
 737                         {
 738                                 monitor.Stop();
 739                         }
 740                 }
 741
 742                 public void RefreshOverlays()
 743                 {
 744                         foreach (var pair in Monitors)
 745                         {
 746                                 var monitor = pair.Value;
 747
 748                                 var path = monitor.RootPath;
 749
 750                                 if (String.IsNullOrWhiteSpace(path))
 751                                         continue;
 752
 753                                 if (!Directory.Exists(path) && !File.Exists(path))
 754                                         continue;
 755
 756                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 757
 758                                 try
 759                                 {
 760                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 761                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 762                                                                                                  pathPointer, IntPtr.Zero);
 763                                 }
 764                                 finally
 765                                 {
 766                                         Marshal.FreeHGlobal(pathPointer);
 767                                 }
 768                         }
 769                 }
 770
 771                 #region Event Handlers
 772
 773                 public void Handle(SelectiveSynchChanges message)
 774                 {
 775                         var accountName = message.Account.AccountName;
 776                         PithosMonitor monitor;
 777                         if (_monitors.TryGetValue(accountName, out monitor))
 778                         {
 779                                 monitor.SetSelectivePaths(message.Uris,message.Added,message.Removed);
 780
 781                         }
 782
 783                 }
 784
 785
 786                 private bool _pollStarted = false;
 787
 788                 //SMELL: Doing so much work for notifications in the shell is wrong
 789                 //The notifications should be moved to their own view/viewmodel pair
 790                 //and different templates should be used for different message types
 791                 //This will also allow the addition of extra functionality, eg. actions
 792                 //
 793                 public void Handle(Notification notification)
 794                 {
 795                         UpdateStatus();
 796
 797                         if (!Settings.ShowDesktopNotifications)
 798                                 return;
 799
 800                         if (notification is PollNotification)
 801                         {
 802                                 _pollStarted = true;
 803                                 return;
 804                         }
 805                         if (notification is CloudNotification)
 806                         {
 807                                 if (!_pollStarted)
 808                                         return;
 809                                 _pollStarted= false;
 810                                 notification.Title = "Pithos";
 811                                 notification.Message = "Start Synchronisation";
 812                         }
 813
 814                         if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
 815                                 return;
 816
 817                         BalloonIcon icon;
 818                         switch (notification.Level)
 819                         {
 820                                 case TraceLevel.Error:
 821                                         icon = BalloonIcon.Error;
 822                                         break;
 823                                 case TraceLevel.Info:
 824                                 case TraceLevel.Verbose:
 825                                         icon = BalloonIcon.Info;
 826                                         break;
 827                                 case TraceLevel.Warning:
 828                                         icon = BalloonIcon.Warning;
 829                                         break;
 830                                 default:
 831                                         icon = BalloonIcon.None;
 832                                         break;
 833                         }
 834
 835                         if (Settings.ShowDesktopNotifications)
 836                         {
 837                                 var tv = (ShellView) GetView();
 838                             System.Action clickAction = null;
 839                 if (notification is ExpirationNotification)
 840                 {
 841                     clickAction = ()=>ShowPreferences("AccountTab");
 842                 }
 843                                 var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon,ClickAction=clickAction};
 844                                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 845 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 846                         }
 847                 }
 848                 #endregion
 849
 850                 public void Handle(ShowFilePropertiesEvent message)
 851                 {
 852                         if (message == null)
 853                                 throw new ArgumentNullException("message");
 854                         if (String.IsNullOrWhiteSpace(message.FileName) )
 855                                 throw new ArgumentException("message");
 856                         Contract.EndContractBlock();
 857
 858                         var fileName = message.FileName;
 859                         //TODO: Display file properties for non-container folders
 860                         if (File.Exists(fileName))
 861                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 862                                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 863                         else if (Directory.Exists(fileName))
 864                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 865                         {
 866                                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 867                                 if (IsContainer(path))
 868                                         ShowContainerProperties(path);
 869                                 else
 870                                         ShowFileProperties(path);
 871                         }
 872                 }
 873
 874                 private bool IsContainer(string path)
 875                 {
 876                         var matchingFolders = from account in _accounts
 877                                                                   from rootFolder in Directory.GetDirectories(account.AccountPath)
 878                                                                   where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 879                                                                   select rootFolder;
 880                         return matchingFolders.Any();
 881                 }
 882
 883                 public FileStatus GetFileStatus(string localFileName)
 884                 {
 885                         if (String.IsNullOrWhiteSpace(localFileName))
 886                                 throw new ArgumentNullException("localFileName");
 887                         Contract.EndContractBlock();
 888
 889                         var statusKeeper = IoC.Get<IStatusKeeper>();
 890                         var status=statusKeeper.GetFileStatus(localFileName);
 891                         return status;
 892                 }
 893         }
 894 }