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

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