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

   1 using System.Collections.Concurrent;
   2 using System.Diagnostics;
   3 using System.Diagnostics.Contracts;
   4 using System.IO;
   5 using System.Net;
   6 using System.Reflection;
   7 using System.Runtime.InteropServices;
   8 using System.ServiceModel;
   9 using System.Threading.Tasks;
  10 using System.Windows;
  11 using System.Windows.Controls.Primitives;
  12 using Caliburn.Micro;
  13 using Hardcodet.Wpf.TaskbarNotification;
  14 using Pithos.Client.WPF.Configuration;
  15 using Pithos.Client.WPF.FileProperties;
  16 using Pithos.Client.WPF.Preferences;
  17 using Pithos.Client.WPF.SelectiveSynch;
  18 using Pithos.Client.WPF.Services;
  19 using Pithos.Client.WPF.Shell;
  20 using Pithos.Core;
  21 using Pithos.Core.Agents;
  22 using Pithos.Interfaces;
  23 using System;
  24 using System.Collections.Generic;
  25 using System.Linq;
  26 using Pithos.Network;
  27 using StatusService = Pithos.Client.WPF.Services.StatusService;
  28
  29 namespace Pithos.Client.WPF {
  30         using System.ComponentModel.Composition;
  31
  32
  33         ///<summary>
  34         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  35         /// The shell also hosts the status service called by shell extensions to retrieve file info
  36         ///</summary>
  37         ///<remarks>
  38         /// It is a strange "shell" as its main visible element is an icon instead of a window
  39         /// The shell subscribes to the following events:
  40         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  41         /// * 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
  42         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  43         ///</remarks>
  44         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  45         [Export(typeof(IShell))]
  46         public class ShellViewModel : Screen, IStatusNotification, IShell,
  47                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  48         {
  49                 //The Status Checker provides the current synch state
  50                 //TODO: Could we remove the status checker and use events in its place?
  51                 private readonly IStatusChecker _statusChecker;
  52                 private readonly IEventAggregator _events;
  53
  54                 public PithosSettings Settings { get; private set; }
  55
  56
  57         private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
  58                 ///<summary>
  59                 /// Dictionary of account monitors, keyed by account
  60                 ///</summary>
  61                 ///<remarks>
  62                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
  63                 /// retrieve account and boject info
  64                 ///</remarks>
  65                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
  66                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
  67         public ConcurrentDictionary<string, PithosMonitor> Monitors
  68                 {
  69                         get { return _monitors; }
  70                 }
  71
  72
  73             ///<summary>
  74             /// The status service is used by Shell extensions to retrieve file status information
  75             ///</summary>
  76             //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
  77             private ServiceHost _statusService;
  78
  79                 //Logging in the Pithos client is provided by log4net
  80                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
  81
  82         //Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
  83         private Lazy<FileVersionInfo> _fileVersion;
  84
  85                 ///<summary>
  86                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
  87                 ///</summary>
  88                 ///<remarks>
  89                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
  90                 ///</remarks>
  91                 [ImportingConstructor]
  92                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
  93                 {
  94                         try
  95                         {
  96
  97                                 _windowManager = windowManager;
  98                                 //CHECK: Caliburn doesn't need explicit command construction
  99                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
 100                                 _statusChecker = statusChecker;
 101                                 //The event subst
 102                                 _events = events;
 103                                 _events.Subscribe(this);
 104
 105                                 Settings = settings;
 106
 107                 Proxy.SetFromSettings(settings);
 108
 109                                 StatusMessage = "In Synch";
 110
 111                 _fileVersion=  new Lazy<FileVersionInfo>(() =>
 112                 {
 113                     Assembly assembly = Assembly.GetExecutingAssembly();
 114                     var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 115                     return fileVersion;
 116                 });
 117                                 _accounts.CollectionChanged += (sender, e) =>
 118                                                                                                    {
 119                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 120                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 121                                                                                                    };
 122
 123                         }
 124                         catch (Exception exc)
 125                         {
 126                                 Log.Error("Error while starting the ShellViewModel",exc);
 127                                 throw;
 128                         }
 129                 }
 130
 131
 132                 protected override void OnActivate()
 133                 {
 134                         base.OnActivate();
 135
 136
 137
 138                         StartMonitoring();
 139                 }
 140
 141
 142
 143                 private async void StartMonitoring()
 144                 {
 145                         try
 146                         {
 147                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 148                                 await TaskEx.WhenAll(accounts);
 149                                 _statusService = StatusService.Start();
 150
 151 /*
 152                                 foreach (var account in Settings.Accounts)
 153                                 {
 154                                         await MonitorAccount(account);
 155                                 }
 156 */
 157
 158                         }
 159                         catch (AggregateException exc)
 160                         {
 161                                 exc.Handle(e =>
 162                                 {
 163                                         Log.Error("Error while starting monitoring", e);
 164                                         return true;
 165                                 });
 166                                 throw;
 167                         }
 168                 }
 169
 170                 protected override void OnDeactivate(bool close)
 171                 {
 172                         base.OnDeactivate(close);
 173                         if (close)
 174                         {
 175                                 StatusService.Stop(_statusService);
 176                                 _statusService = null;
 177                         }
 178                 }
 179
 180                 public Task MonitorAccount(AccountSettings account)
 181                 {
 182                         return Task.Factory.StartNew(() =>
 183                         {
 184                                 PithosMonitor monitor;
 185                                 var accountName = account.AccountName;
 186
 187                                 if (_monitors.TryGetValue(accountName, out monitor))
 188                                 {
 189                                         //If the account is active
 190                                         if (account.IsActive)
 191                                                 //Start the monitor. It's OK to start an already started monitor,
 192                                                 //it will just ignore the call
 193                                                 StartMonitor(monitor).Wait();
 194                                         else
 195                                         {
 196                                                 //If the account is inactive
 197                                                 //Stop and remove the monitor
 198                                                 RemoveMonitor(accountName);
 199                                         }
 200                                         return;
 201                                 }
 202
 203
 204                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 205                                 monitor = new PithosMonitor
 206                                                           {
 207                                                                   UserName = accountName,
 208                                                                   ApiKey = account.ApiKey,
 209                                                                   StatusNotification = this,
 210                                                                   RootPath = account.RootPath
 211                                                           };
 212                                 //PithosMonitor uses MEF so we need to resolve it
 213                                 IoC.BuildUp(monitor);
 214
 215                             monitor.AuthenticationUrl = account.ServerUrl;
 216
 217                                 _monitors[accountName] = monitor;
 218
 219                                 if (account.IsActive)
 220                                 {
 221                                         //Don't start a monitor if it doesn't have an account and ApiKey
 222                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 223                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 224                                                 return;
 225                                         StartMonitor(monitor);
 226                                 }
 227                         });
 228                 }
 229
 230
 231                 protected override void OnViewLoaded(object view)
 232                 {
 233                         UpdateStatus();
 234                         var window = (Window)view;
 235                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 236                         base.OnViewLoaded(view);
 237                 }
 238
 239
 240                 #region Status Properties
 241
 242                 private string _statusMessage;
 243                 public string StatusMessage
 244                 {
 245                         get { return _statusMessage; }
 246                         set
 247                         {
 248                                 _statusMessage = value;
 249                                 NotifyOfPropertyChange(() => StatusMessage);
 250                         }
 251                 }
 252
 253                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 254                 public ObservableConcurrentCollection<AccountInfo> Accounts
 255                 {
 256                         get { return _accounts; }
 257                 }
 258
 259                 public bool HasAccounts
 260                 {
 261                         get { return _accounts.Count > 0; }
 262                 }
 263
 264
 265                 public string OpenFolderCaption
 266                 {
 267                         get
 268                         {
 269                                 return (_accounts.Count == 0)
 270                                                 ? "No Accounts Defined"
 271                                                 : "Open Pithos Folder";
 272                         }
 273                 }
 274
 275                 private string _pauseSyncCaption="Pause Synching";
 276                 public string PauseSyncCaption
 277                 {
 278                         get { return _pauseSyncCaption; }
 279                         set
 280                         {
 281                                 _pauseSyncCaption = value;
 282                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 283                         }
 284                 }
 285
 286                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 287                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 288                 {
 289                         get { return _recentFiles; }
 290                 }
 291
 292
 293                 private string _statusIcon="../Images/Pithos.ico";
 294                 public string StatusIcon
 295                 {
 296                         get { return _statusIcon; }
 297                         set
 298                         {
 299                 //TODO: Ensure all status icons use the Pithos logo
 300                                 _statusIcon = value;
 301                                 NotifyOfPropertyChange(() => StatusIcon);
 302                         }
 303                 }
 304
 305                 #endregion
 306
 307                 #region Commands
 308
 309                 public void ShowPreferences()
 310                 {
 311                         Settings.Reload();
 312                         var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 313                         _windowManager.ShowDialog(preferences);
 314
 315                 }
 316
 317                 public void AboutPithos()
 318                 {
 319                         var about = new AboutViewModel();
 320                         _windowManager.ShowWindow(about);
 321                 }
 322
 323                 public void SendFeedback()
 324                 {
 325                         var feedBack =  IoC.Get<FeedbackViewModel>();
 326                         _windowManager.ShowWindow(feedBack);
 327                 }
 328
 329                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 330
 331                 public void OpenPithosFolder()
 332                 {
 333                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 334                         if (account == null)
 335                                 return;
 336                         Process.Start(account.RootPath);
 337                 }
 338
 339                 public void OpenPithosFolder(AccountInfo account)
 340                 {
 341                         Process.Start(account.AccountPath);
 342                 }
 343
 344
 345 /*
 346                 public void GoToSite()
 347                 {
 348                         var site = Properties.Settings.Default.PithosSite;
 349                         Process.Start(site);
 350                 }
 351 */
 352
 353                 public void GoToSite(AccountInfo account)
 354                 {
 355                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 356                                 account.SiteUri,account.Token,
 357                                 account.UserName);*/
 358                         Process.Start(account.SiteUri);
 359                 }
 360
 361                 public void ShowFileProperties()
 362                 {
 363                         var account = Settings.Accounts.First(acc => acc.IsActive);
 364                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 365                         var files=dir.GetFiles();
 366                         var r=new Random();
 367                         var idx=r.Next(0, files.Length);
 368                         ShowFileProperties(files[idx].FullName);
 369                 }
 370
 371                 public void ShowFileProperties(string filePath)
 372                 {
 373                         if (String.IsNullOrWhiteSpace(filePath))
 374                                 throw new ArgumentNullException("filePath");
 375                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 376                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 377                         Contract.EndContractBlock();
 378
 379                         var pair=(from monitor in  Monitors
 380                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 381                                                                    select monitor).FirstOrDefault();
 382                     var accountMonitor = pair.Value;
 383
 384                         if (accountMonitor == null)
 385                                 return;
 386
 387                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 388
 389
 390
 391                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 392                         _windowManager.ShowWindow(fileProperties);
 393                 }
 394
 395                 public void ShowContainerProperties()
 396                 {
 397                         var account = Settings.Accounts.First(acc => acc.IsActive);
 398                         var dir = new DirectoryInfo(account.RootPath);
 399                         var fullName = (from folder in dir.EnumerateDirectories()
 400                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 401                                                         select folder.FullName).First();
 402                         ShowContainerProperties(fullName);
 403                 }
 404
 405                 public void ShowContainerProperties(string filePath)
 406                 {
 407                         if (String.IsNullOrWhiteSpace(filePath))
 408                                 throw new ArgumentNullException("filePath");
 409                         if (!Directory.Exists(filePath))
 410                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 411                         Contract.EndContractBlock();
 412
 413                         var pair=(from monitor in  Monitors
 414                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 415                                                                    select monitor).FirstOrDefault();
 416                     var accountMonitor = pair.Value;
 417                         var info = accountMonitor.GetContainerInfo(filePath);
 418
 419
 420
 421                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 422                         _windowManager.ShowWindow(containerProperties);
 423                 }
 424
 425         public void SynchNow()
 426         {
 427             var agent = IoC.Get<NetworkAgent>();
 428             agent.SynchNow();
 429         }
 430
 431                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 432                 {
 433                         if (currentInfo==null)
 434                                 throw new ArgumentNullException("currentInfo");
 435                         Contract.EndContractBlock();
 436
 437                         var monitor = Monitors[currentInfo.Account];
 438                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 439                         return newInfo;
 440                 }
 441
 442                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 443                 {
 444                         if (container == null)
 445                                 throw new ArgumentNullException("container");
 446                         Contract.EndContractBlock();
 447
 448                         var monitor = Monitors[container.Account];
 449                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 450                         return newInfo;
 451                 }
 452
 453
 454                 public void ToggleSynching()
 455                 {
 456                         bool isPaused=false;
 457                         foreach (var pair in Monitors)
 458                         {
 459                                 var monitor = pair.Value;
 460                                 monitor.Pause = !monitor.Pause;
 461                                 isPaused = monitor.Pause;
 462                         }
 463
 464                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 465                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 466                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 467                 }
 468
 469                 public void ExitPithos()
 470                 {
 471                         foreach (var pair in Monitors)
 472                         {
 473                                 var monitor = pair.Value;
 474                                 monitor.Stop();
 475                         }
 476
 477                         ((Window)GetView()).Close();
 478                 }
 479                 #endregion
 480
 481
 482                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 483                         {
 484                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 485                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 486                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 487                         }.ToDictionary(s => s.Status);
 488
 489                 readonly IWindowManager _windowManager;
 490
 491
 492                 ///<summary>
 493                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 494                 ///</summary>
 495                 public void UpdateStatus()
 496                 {
 497                         var pithosStatus = _statusChecker.GetPithosStatus();
 498
 499                         if (_iconNames.ContainsKey(pithosStatus))
 500                         {
 501                                 var info = _iconNames[pithosStatus];
 502                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 503
 504
 505
 506                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
 507                         }
 508
 509                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 510                 }
 511
 512
 513
 514                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 515                 {
 516                         return Task.Factory.StartNew(() =>
 517                         {
 518                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 519                                 {
 520                                         try
 521                                         {
 522                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 523
 524                                                 monitor.Start();
 525                                         }
 526                                         catch (WebException exc)
 527                                         {
 528                                                 if (AbandonRetry(monitor, retries))
 529                                                         return;
 530
 531                         HttpStatusCode statusCode =HttpStatusCode.OK;
 532                                     var response = exc.Response as HttpWebResponse;
 533                         if(response!=null)
 534                                                 statusCode = response.StatusCode;
 535
 536                         switch (statusCode)
 537                         {
 538                             case HttpStatusCode.Unauthorized:
 539                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 540                                                             monitor.UserName);
 541                                 Log.Error(message, exc);
 542                                 TryAuthorize(monitor, retries).Wait();
 543                                 break;
 544                             case HttpStatusCode.ProxyAuthenticationRequired:
 545                                 TryAuthenticateProxy(monitor,retries);
 546                                 break;
 547                             default:
 548                                 TryLater(monitor, exc, retries);
 549                                 break;
 550                         }
 551                                         }
 552                                         catch (Exception exc)
 553                                         {
 554                                                 if (AbandonRetry(monitor, retries))
 555                                                         return;
 556
 557                                                 TryLater(monitor,exc,retries);
 558                                         }
 559                                 }
 560                         });
 561                 }
 562
 563             private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 564             {
 565                 Execute.OnUIThread(() =>
 566                                        {
 567                                            var proxyAccount = IoC.Get<ProxyAccountViewModel>();
 568                                         proxyAccount.Settings = this.Settings;
 569                                            if (true != _windowManager.ShowDialog(proxyAccount))
 570                                            return;
 571                                            StartMonitor(monitor, retries);
 572                                            NotifyOfPropertyChange(() => Accounts);
 573                                        });
 574             }
 575
 576             private bool AbandonRetry(PithosMonitor monitor, int retries)
 577                 {
 578                         if (retries > 1)
 579                         {
 580                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 581                                                                                         monitor.UserName);
 582                                 _events.Publish(new Notification
 583                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 584                                 return true;
 585                         }
 586                         return false;
 587                 }
 588
 589
 590                 private async Task TryAuthorize(PithosMonitor monitor,int retries)
 591                 {
 592                         _events.Publish(new Notification { Title = "Authorization failed", Message = "Your API Key has probably expired. You will be directed to a page where you can renew it", Level = TraceLevel.Error });
 593
 594                         try
 595                         {
 596
 597                                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 598
 599                                 var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
 600                                 account.ApiKey = credentials.Password;
 601                                 monitor.ApiKey = credentials.Password;
 602                                 Settings.Save();
 603                                 await TaskEx.Delay(10000);
 604                                 StartMonitor(monitor, retries + 1);
 605                                 NotifyOfPropertyChange(()=>Accounts);
 606                         }
 607                         catch (AggregateException exc)
 608                         {
 609                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 610                                 Log.Error(message, exc.InnerException);
 611                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 612                         }
 613                         catch (Exception exc)
 614                         {
 615                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 616                                 Log.Error(message, exc);
 617                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 618                         }
 619
 620                 }
 621
 622                 private static bool IsUnauthorized(WebException exc)
 623                 {
 624                         if (exc==null)
 625                                 throw new ArgumentNullException("exc");
 626                         Contract.EndContractBlock();
 627
 628                         var response = exc.Response as HttpWebResponse;
 629                         if (response == null)
 630                                 return false;
 631                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 632                 }
 633
 634                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 635                 {
 636                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 637                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 638                         _events.Publish(new Notification
 639                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 640                         Log.Error(message, exc);
 641                 }
 642
 643
 644                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 645                 {
 646                         StatusMessage = status;
 647
 648                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 649                 }
 650
 651                 public void NotifyChangedFile(string filePath)
 652                 {
 653                         var entry = new FileEntry {FullPath=filePath};
 654                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 655                         FileEntry popped;
 656                         while (files.Count > 5)
 657                                 files.TryTake(out popped);
 658                         files.TryAdd(entry);
 659                 }
 660
 661                 public void NotifyAccount(AccountInfo account)
 662                 {
 663                         if (account== null)
 664                                 return;
 665                         //TODO: What happens to an existing account whose Token has changed?
 666                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 667                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 668                 Uri.EscapeDataString(account.UserName));
 669
 670                         if (Accounts.All(item => item.UserName != account.UserName))
 671                                 Accounts.TryAdd(account);
 672
 673                 }
 674
 675             public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 676             {
 677             if (conflictFiles == null)
 678                 return;
 679             if (!conflictFiles.Any())
 680                 return;
 681
 682             UpdateStatus();
 683             //TODO: Create a more specific message. For now, just show a warning
 684             NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 685
 686             }
 687
 688             public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 689             {
 690             if (files == null)
 691                 return;
 692             if (!files.Any())
 693                 return;
 694
 695             StatusMessage = message;
 696
 697             _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 698         }
 699
 700         public void Notify(Notification notification)
 701         {
 702             _events.Publish(notification);
 703         }
 704
 705
 706             public void RemoveMonitor(string accountName)
 707                 {
 708                         if (String.IsNullOrWhiteSpace(accountName))
 709                                 return;
 710
 711                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 712                         _accounts.TryRemove(accountInfo);
 713
 714                         PithosMonitor monitor;
 715                         if (Monitors.TryRemove(accountName, out monitor))
 716                         {
 717                                 monitor.Stop();
 718                         }
 719                 }
 720
 721                 public void RefreshOverlays()
 722                 {
 723                         foreach (var pair in Monitors)
 724                         {
 725                                 var monitor = pair.Value;
 726
 727                                 var path = monitor.RootPath;
 728
 729                                 if (String.IsNullOrWhiteSpace(path))
 730                                         continue;
 731
 732                                 if (!Directory.Exists(path) && !File.Exists(path))
 733                                         continue;
 734
 735                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 736
 737                                 try
 738                                 {
 739                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 740                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 741                                                                                                  pathPointer, IntPtr.Zero);
 742                                 }
 743                                 finally
 744                                 {
 745                                         Marshal.FreeHGlobal(pathPointer);
 746                                 }
 747                         }
 748                 }
 749
 750                 #region Event Handlers
 751
 752                 public void Handle(SelectiveSynchChanges message)
 753                 {
 754                         var accountName = message.Account.AccountName;
 755                         PithosMonitor monitor;
 756                         if (_monitors.TryGetValue(accountName, out monitor))
 757                         {
 758                                 monitor.AddSelectivePaths(message.Added);
 759                                 monitor.RemoveSelectivePaths(message.Removed);
 760
 761                         }
 762
 763                 }
 764
 765
 766             private bool _pollStarted = false;
 767
 768         //SMELL: Doing so much work for notifications in the shell is wrong
 769         //The notifications should be moved to their own view/viewmodel pair
 770         //and different templates should be used for different message types
 771         //This will also allow the addition of extra functionality, eg. actions
 772         //
 773                 public void Handle(Notification notification)
 774                 {
 775             UpdateStatus();
 776
 777                         if (!Settings.ShowDesktopNotifications)
 778                                 return;
 779
 780             if (notification is PollNotification)
 781             {
 782                 _pollStarted = true;
 783                 return;
 784             }
 785             if (notification is CloudNotification)
 786             {
 787                 if (!_pollStarted)
 788                     return;
 789                 _pollStarted= false;
 790                 notification.Title = "Pithos";
 791                 notification.Message = "Start Synchronisation";
 792             }
 793
 794             if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
 795                 return;
 796
 797                         BalloonIcon icon;
 798                         switch (notification.Level)
 799                         {
 800                                 case TraceLevel.Error:
 801                                         icon = BalloonIcon.Error;
 802                                         break;
 803                                 case TraceLevel.Info:
 804                                 case TraceLevel.Verbose:
 805                                         icon = BalloonIcon.Info;
 806                                         break;
 807                                 case TraceLevel.Warning:
 808                                         icon = BalloonIcon.Warning;
 809                                         break;
 810                                 default:
 811                                         icon = BalloonIcon.None;
 812                                         break;
 813                         }
 814
 815                         if (Settings.ShowDesktopNotifications)
 816                         {
 817                                 var tv = (ShellView) GetView();
 818                 var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon};
 819                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 820 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 821                         }
 822                 }
 823                 #endregion
 824
 825                 public void Handle(ShowFilePropertiesEvent message)
 826                 {
 827                         if (message == null)
 828                                 throw new ArgumentNullException("message");
 829                         if (String.IsNullOrWhiteSpace(message.FileName) )
 830                                 throw new ArgumentException("message");
 831                         Contract.EndContractBlock();
 832
 833                         var fileName = message.FileName;
 834             //TODO: Display file properties for non-container folders
 835                         if (File.Exists(fileName))
 836                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 837                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 838                         else if (Directory.Exists(fileName))
 839                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 840                         {
 841                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 842                 if (IsContainer(path))
 843                                 ShowContainerProperties(path);
 844                 else
 845                     ShowFileProperties(path);
 846                         }
 847                 }
 848
 849             private bool IsContainer(string path)
 850             {
 851                 var matchingFolders = from account in _accounts
 852                                       from rootFolder in Directory.GetDirectories(account.AccountPath)
 853                                       where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 854                                       select rootFolder;
 855                 return matchingFolders.Any();
 856             }
 857
 858             public FileStatus GetFileStatus(string localFileName)
 859             {
 860             if (String.IsNullOrWhiteSpace(localFileName))
 861                 throw new ArgumentNullException("localFileName");
 862             Contract.EndContractBlock();
 863
 864                 var statusKeeper = IoC.Get<IStatusKeeper>();
 865                 var status=statusKeeper.GetFileStatus(localFileName);
 866                 return status;
 867             }
 868         }
 869 }