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.SelectiveSynch;
  59 using Pithos.Client.WPF.Services;
  60 using Pithos.Client.WPF.Shell;
  61 using Pithos.Core;
  62 using Pithos.Core.Agents;
  63 using Pithos.Interfaces;
  64 using System;
  65 using System.Collections.Generic;
  66 using System.Linq;
  67 using Pithos.Network;
  68 using StatusService = Pithos.Client.WPF.Services.StatusService;
  69
  70 namespace Pithos.Client.WPF {
  71         using System.ComponentModel.Composition;
  72
  73
  74         ///<summary>
  75         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  76         /// The shell also hosts the status service called by shell extensions to retrieve file info
  77         ///</summary>
  78         ///<remarks>
  79         /// It is a strange "shell" as its main visible element is an icon instead of a window
  80         /// The shell subscribes to the following events:
  81         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  82         /// * 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
  83         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  84         ///</remarks>
  85         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  86         [Export(typeof(IShell))]
  87         public class ShellViewModel : Screen, IStatusNotification, IShell,
  88                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  89         {
  90                 //The Status Checker provides the current synch state
  91                 //TODO: Could we remove the status checker and use events in its place?
  92                 private readonly IStatusChecker _statusChecker;
  93                 private readonly IEventAggregator _events;
  94
  95                 public PithosSettings Settings { get; private set; }
  96
  97
  98                 private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
  99                 ///<summary>
 100                 /// Dictionary of account monitors, keyed by account
 101                 ///</summary>
 102                 ///<remarks>
 103                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
 104                 /// retrieve account and boject info
 105                 ///</remarks>
 106                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
 107                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
 108                 public ConcurrentDictionary<string, PithosMonitor> Monitors
 109                 {
 110                         get { return _monitors; }
 111                 }
 112
 113
 114                 ///<summary>
 115                 /// The status service is used by Shell extensions to retrieve file status information
 116                 ///</summary>
 117                 //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
 118                 private ServiceHost _statusService;
 119
 120                 //Logging in the Pithos client is provided by log4net
 121                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
 122
 123                 //Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
 124                 private Lazy<FileVersionInfo> _fileVersion;
 125
 126                 ///<summary>
 127                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
 128                 ///</summary>
 129                 ///<remarks>
 130                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
 131                 ///</remarks>
 132                 [ImportingConstructor]
 133                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
 134                 {
 135                         try
 136                         {
 137
 138                                 _windowManager = windowManager;
 139                                 //CHECK: Caliburn doesn't need explicit command construction
 140                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
 141                                 _statusChecker = statusChecker;
 142                                 //The event subst
 143                                 _events = events;
 144                                 _events.Subscribe(this);
 145
 146                                 Settings = settings;
 147
 148                                 Proxy.SetFromSettings(settings);
 149
 150                                 StatusMessage = "In Synch";
 151
 152                                 _fileVersion=  new Lazy<FileVersionInfo>(() =>
 153                                 {
 154                                         Assembly assembly = Assembly.GetExecutingAssembly();
 155                                         var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 156                                         return fileVersion;
 157                                 });
 158                                 _accounts.CollectionChanged += (sender, e) =>
 159                                                                                                    {
 160                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 161                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 162                                                                                                    };
 163
 164                         }
 165                         catch (Exception exc)
 166                         {
 167                                 Log.Error("Error while starting the ShellViewModel",exc);
 168                                 throw;
 169                         }
 170                 }
 171
 172
 173                 protected override void OnActivate()
 174                 {
 175                         base.OnActivate();
 176
 177
 178
 179                         StartMonitoring();
 180                 }
 181
 182
 183
 184                 private async void StartMonitoring()
 185                 {
 186                         try
 187                         {
 188                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 189                                 await TaskEx.WhenAll(accounts);
 190                                 _statusService = StatusService.Start();
 191
 192 /*
 193                                 foreach (var account in Settings.Accounts)
 194                                 {
 195                                         await MonitorAccount(account);
 196                                 }
 197 */
 198
 199                         }
 200                         catch (AggregateException exc)
 201                         {
 202                                 exc.Handle(e =>
 203                                 {
 204                                         Log.Error("Error while starting monitoring", e);
 205                                         return true;
 206                                 });
 207                                 throw;
 208                         }
 209                 }
 210
 211                 protected override void OnDeactivate(bool close)
 212                 {
 213                         base.OnDeactivate(close);
 214                         if (close)
 215                         {
 216                                 StatusService.Stop(_statusService);
 217                                 _statusService = null;
 218                         }
 219                 }
 220
 221                 public Task MonitorAccount(AccountSettings account)
 222                 {
 223                         return Task.Factory.StartNew(() =>
 224                         {
 225                                 PithosMonitor monitor;
 226                                 var accountName = account.AccountName;
 227
 228                                 if (_monitors.TryGetValue(accountName, out monitor))
 229                                 {
 230                                         //If the account is active
 231                                         if (account.IsActive)
 232                                                 //Start the monitor. It's OK to start an already started monitor,
 233                                                 //it will just ignore the call
 234                                                 StartMonitor(monitor).Wait();
 235                                         else
 236                                         {
 237                                                 //If the account is inactive
 238                                                 //Stop and remove the monitor
 239                                                 RemoveMonitor(accountName);
 240                                         }
 241                                         return;
 242                                 }
 243
 244
 245                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 246                                 monitor = new PithosMonitor
 247                                                           {
 248                                                                   UserName = accountName,
 249                                                                   ApiKey = account.ApiKey,
 250                                                                   StatusNotification = this,
 251                                                                   RootPath = account.RootPath
 252                                                           };
 253                                 //PithosMonitor uses MEF so we need to resolve it
 254                                 IoC.BuildUp(monitor);
 255
 256                                 monitor.AuthenticationUrl = account.ServerUrl;
 257
 258                                 _monitors[accountName] = monitor;
 259
 260                                 if (account.IsActive)
 261                                 {
 262                                         //Don't start a monitor if it doesn't have an account and ApiKey
 263                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 264                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 265                                                 return;
 266                                         StartMonitor(monitor);
 267                                 }
 268                         });
 269                 }
 270
 271
 272                 protected override void OnViewLoaded(object view)
 273                 {
 274                         UpdateStatus();
 275                         var window = (Window)view;
 276                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 277                         base.OnViewLoaded(view);
 278                 }
 279
 280
 281                 #region Status Properties
 282
 283                 private string _statusMessage;
 284                 public string StatusMessage
 285                 {
 286                         get { return _statusMessage; }
 287                         set
 288                         {
 289                                 _statusMessage = value;
 290                                 NotifyOfPropertyChange(() => StatusMessage);
 291                         }
 292                 }
 293
 294                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 295                 public ObservableConcurrentCollection<AccountInfo> Accounts
 296                 {
 297                         get { return _accounts; }
 298                 }
 299
 300                 public bool HasAccounts
 301                 {
 302                         get { return _accounts.Count > 0; }
 303                 }
 304
 305
 306                 public string OpenFolderCaption
 307                 {
 308                         get
 309                         {
 310                                 return (_accounts.Count == 0)
 311                                                 ? "No Accounts Defined"
 312                                                 : "Open Pithos Folder";
 313                         }
 314                 }
 315
 316                 private string _pauseSyncCaption="Pause Synching";
 317                 public string PauseSyncCaption
 318                 {
 319                         get { return _pauseSyncCaption; }
 320                         set
 321                         {
 322                                 _pauseSyncCaption = value;
 323                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 324                         }
 325                 }
 326
 327                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 328                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 329                 {
 330                         get { return _recentFiles; }
 331                 }
 332
 333
 334                 private string _statusIcon="../Images/Pithos.ico";
 335                 public string StatusIcon
 336                 {
 337                         get { return _statusIcon; }
 338                         set
 339                         {
 340                                 //TODO: Ensure all status icons use the Pithos logo
 341                                 _statusIcon = value;
 342                                 NotifyOfPropertyChange(() => StatusIcon);
 343                         }
 344                 }
 345
 346                 #endregion
 347
 348                 #region Commands
 349
 350                 public void ShowPreferences()
 351                 {
 352                         Settings.Reload();
 353                         var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 354                         _windowManager.ShowDialog(preferences);
 355
 356                 }
 357
 358                 public void AboutPithos()
 359                 {
 360                         var about = new AboutViewModel();
 361                         _windowManager.ShowWindow(about);
 362                 }
 363
 364                 public void SendFeedback()
 365                 {
 366                         var feedBack =  IoC.Get<FeedbackViewModel>();
 367                         _windowManager.ShowWindow(feedBack);
 368                 }
 369
 370                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 371
 372                 public void OpenPithosFolder()
 373                 {
 374                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 375                         if (account == null)
 376                                 return;
 377                         Process.Start(account.RootPath);
 378                 }
 379
 380                 public void OpenPithosFolder(AccountInfo account)
 381                 {
 382                         Process.Start(account.AccountPath);
 383                 }
 384
 385
 386 /*
 387                 public void GoToSite()
 388                 {
 389                         var site = Properties.Settings.Default.PithosSite;
 390                         Process.Start(site);
 391                 }
 392 */
 393
 394                 public void GoToSite(AccountInfo account)
 395                 {
 396                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 397                                 account.SiteUri,account.Token,
 398                                 account.UserName);*/
 399                         Process.Start(account.SiteUri);
 400                 }
 401
 402                 public void ShowFileProperties()
 403                 {
 404                         var account = Settings.Accounts.First(acc => acc.IsActive);
 405                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 406                         var files=dir.GetFiles();
 407                         var r=new Random();
 408                         var idx=r.Next(0, files.Length);
 409                         ShowFileProperties(files[idx].FullName);
 410                 }
 411
 412                 public void ShowFileProperties(string filePath)
 413                 {
 414                         if (String.IsNullOrWhiteSpace(filePath))
 415                                 throw new ArgumentNullException("filePath");
 416                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 417                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 418                         Contract.EndContractBlock();
 419
 420                         var pair=(from monitor in  Monitors
 421                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 422                                                                    select monitor).FirstOrDefault();
 423                         var accountMonitor = pair.Value;
 424
 425                         if (accountMonitor == null)
 426                                 return;
 427
 428                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 429
 430
 431
 432                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 433                         _windowManager.ShowWindow(fileProperties);
 434                 }
 435
 436                 public void ShowContainerProperties()
 437                 {
 438                         var account = Settings.Accounts.First(acc => acc.IsActive);
 439                         var dir = new DirectoryInfo(account.RootPath);
 440                         var fullName = (from folder in dir.EnumerateDirectories()
 441                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 442                                                         select folder.FullName).First();
 443                         ShowContainerProperties(fullName);
 444                 }
 445
 446                 public void ShowContainerProperties(string filePath)
 447                 {
 448                         if (String.IsNullOrWhiteSpace(filePath))
 449                                 throw new ArgumentNullException("filePath");
 450                         if (!Directory.Exists(filePath))
 451                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 452                         Contract.EndContractBlock();
 453
 454                         var pair=(from monitor in  Monitors
 455                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 456                                                                    select monitor).FirstOrDefault();
 457                         var accountMonitor = pair.Value;
 458                         var info = accountMonitor.GetContainerInfo(filePath);
 459
 460
 461
 462                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 463                         _windowManager.ShowWindow(containerProperties);
 464                 }
 465
 466                 public void SynchNow()
 467                 {
 468                         var agent = IoC.Get<PollAgent>();
 469                         agent.SynchNow();
 470                 }
 471
 472                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 473                 {
 474                         if (currentInfo==null)
 475                                 throw new ArgumentNullException("currentInfo");
 476                         Contract.EndContractBlock();
 477
 478                         var monitor = Monitors[currentInfo.Account];
 479                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 480                         return newInfo;
 481                 }
 482
 483                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 484                 {
 485                         if (container == null)
 486                                 throw new ArgumentNullException("container");
 487                         Contract.EndContractBlock();
 488
 489                         var monitor = Monitors[container.Account];
 490                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 491                         return newInfo;
 492                 }
 493
 494
 495                 public void ToggleSynching()
 496                 {
 497                         bool isPaused=false;
 498                         foreach (var pair in Monitors)
 499                         {
 500                                 var monitor = pair.Value;
 501                                 monitor.Pause = !monitor.Pause;
 502                                 isPaused = monitor.Pause;
 503                         }
 504
 505                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 506                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 507                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 508                 }
 509
 510                 public void ExitPithos()
 511                 {
 512                         foreach (var pair in Monitors)
 513                         {
 514                                 var monitor = pair.Value;
 515                                 monitor.Stop();
 516                         }
 517
 518                         ((Window)GetView()).Close();
 519                 }
 520                 #endregion
 521
 522
 523                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 524                         {
 525                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 526                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 527                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 528                         }.ToDictionary(s => s.Status);
 529
 530                 readonly IWindowManager _windowManager;
 531
 532
 533                 ///<summary>
 534                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 535                 ///</summary>
 536                 public void UpdateStatus()
 537                 {
 538                         var pithosStatus = _statusChecker.GetPithosStatus();
 539
 540                         if (_iconNames.ContainsKey(pithosStatus))
 541                         {
 542                                 var info = _iconNames[pithosStatus];
 543                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 544
 545
 546
 547                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
 548                         }
 549
 550                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 551                 }
 552
 553
 554
 555                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 556                 {
 557                         return Task.Factory.StartNew(() =>
 558                         {
 559                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 560                                 {
 561                                         try
 562                                         {
 563                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 564
 565                                                 monitor.Start();
 566                                         }
 567                                         catch (WebException exc)
 568                                         {
 569                                                 if (AbandonRetry(monitor, retries))
 570                                                         return;
 571
 572                                                 HttpStatusCode statusCode =HttpStatusCode.OK;
 573                                                 var response = exc.Response as HttpWebResponse;
 574                                                 if(response!=null)
 575                                                         statusCode = response.StatusCode;
 576
 577                                                 switch (statusCode)
 578                                                 {
 579                                                         case HttpStatusCode.Unauthorized:
 580                                                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 581                                                                                                                         monitor.UserName);
 582                                                                 Log.Error(message, exc);
 583                                                                 TryAuthorize(monitor.UserName, retries).Wait();
 584                                                                 break;
 585                                                         case HttpStatusCode.ProxyAuthenticationRequired:
 586                                                                 TryAuthenticateProxy(monitor,retries);
 587                                                                 break;
 588                                                         default:
 589                                                                 TryLater(monitor, exc, retries);
 590                                                                 break;
 591                                                 }
 592                                         }
 593                                         catch (Exception exc)
 594                                         {
 595                                                 if (AbandonRetry(monitor, retries))
 596                                                         return;
 597
 598                                                 TryLater(monitor,exc,retries);
 599                                         }
 600                                 }
 601                         });
 602                 }
 603
 604                 private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 605                 {
 606                         Execute.OnUIThread(() =>
 607                                                                    {
 608                                                                            var proxyAccount = IoC.Get<ProxyAccountViewModel>();
 609                                                                                 proxyAccount.Settings = this.Settings;
 610                                                                            if (true != _windowManager.ShowDialog(proxyAccount))
 611                                                                                    return;
 612                                                                            StartMonitor(monitor, retries);
 613                                                                            NotifyOfPropertyChange(() => Accounts);
 614                                                                    });
 615                 }
 616
 617                 private bool AbandonRetry(PithosMonitor monitor, int retries)
 618                 {
 619                         if (retries > 1)
 620                         {
 621                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 622                                                                                         monitor.UserName);
 623                                 _events.Publish(new Notification
 624                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 625                                 return true;
 626                         }
 627                         return false;
 628                 }
 629
 630
 631                 public async Task TryAuthorize(string userName, int retries)
 632                 {
 633                         _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 });
 634
 635                         try
 636                         {
 637
 638                                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 639
 640                                 var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
 641                 //The server may return credentials for a different account
 642                             var monitor = _monitors[account.AccountName];
 643                                 account.ApiKey = credentials.Password;
 644                 monitor.ApiKey = credentials.Password;
 645                                 Settings.Save();
 646                                 await TaskEx.Delay(10000);
 647                 StartMonitor(monitor, retries + 1);
 648                                 NotifyOfPropertyChange(()=>Accounts);
 649                         }
 650                         catch (AggregateException exc)
 651                         {
 652                                 string message = String.Format("API Key retrieval for {0} failed", userName);
 653                                 Log.Error(message, exc.InnerException);
 654                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 655                         }
 656                         catch (Exception exc)
 657                         {
 658                                 string message = String.Format("API Key retrieval for {0} failed", userName);
 659                                 Log.Error(message, exc);
 660                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 661                         }
 662
 663                 }
 664
 665                 private static bool IsUnauthorized(WebException exc)
 666                 {
 667                         if (exc==null)
 668                                 throw new ArgumentNullException("exc");
 669                         Contract.EndContractBlock();
 670
 671                         var response = exc.Response as HttpWebResponse;
 672                         if (response == null)
 673                                 return false;
 674                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 675                 }
 676
 677                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 678                 {
 679                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 680                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 681                         _events.Publish(new Notification
 682                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 683                         Log.Error(message, exc);
 684                 }
 685
 686
 687                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 688                 {
 689                         StatusMessage = status;
 690
 691                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 692                 }
 693
 694                 public void NotifyChangedFile(string filePath)
 695                 {
 696                         var entry = new FileEntry {FullPath=filePath};
 697                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 698                         FileEntry popped;
 699                         while (files.Count > 5)
 700                                 files.TryTake(out popped);
 701                         files.TryAdd(entry);
 702                 }
 703
 704                 public void NotifyAccount(AccountInfo account)
 705                 {
 706                         if (account== null)
 707                                 return;
 708                         //TODO: What happens to an existing account whose Token has changed?
 709                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 710                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 711                                 Uri.EscapeDataString(account.UserName));
 712
 713                         if (Accounts.All(item => item.UserName != account.UserName))
 714                                 Accounts.TryAdd(account);
 715
 716                 }
 717
 718                 public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 719                 {
 720                         if (conflictFiles == null)
 721                                 return;
 722                         if (!conflictFiles.Any())
 723                                 return;
 724
 725                         UpdateStatus();
 726                         //TODO: Create a more specific message. For now, just show a warning
 727                         NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 728
 729                 }
 730
 731                 public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 732                 {
 733                         if (files == null)
 734                                 return;
 735                         if (!files.Any())
 736                                 return;
 737
 738                         StatusMessage = message;
 739
 740                         _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 741                 }
 742
 743                 public void Notify(Notification notification)
 744                 {
 745                         _events.Publish(notification);
 746                 }
 747
 748
 749                 public void RemoveMonitor(string accountName)
 750                 {
 751                         if (String.IsNullOrWhiteSpace(accountName))
 752                                 return;
 753
 754                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 755                         _accounts.TryRemove(accountInfo);
 756
 757                         PithosMonitor monitor;
 758                         if (Monitors.TryRemove(accountName, out monitor))
 759                         {
 760                                 monitor.Stop();
 761                         }
 762                 }
 763
 764                 public void RefreshOverlays()
 765                 {
 766                         foreach (var pair in Monitors)
 767                         {
 768                                 var monitor = pair.Value;
 769
 770                                 var path = monitor.RootPath;
 771
 772                                 if (String.IsNullOrWhiteSpace(path))
 773                                         continue;
 774
 775                                 if (!Directory.Exists(path) && !File.Exists(path))
 776                                         continue;
 777
 778                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 779
 780                                 try
 781                                 {
 782                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 783                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 784                                                                                                  pathPointer, IntPtr.Zero);
 785                                 }
 786                                 finally
 787                                 {
 788                                         Marshal.FreeHGlobal(pathPointer);
 789                                 }
 790                         }
 791                 }
 792
 793                 #region Event Handlers
 794
 795                 public void Handle(SelectiveSynchChanges message)
 796                 {
 797                         var accountName = message.Account.AccountName;
 798                         PithosMonitor monitor;
 799                         if (_monitors.TryGetValue(accountName, out monitor))
 800                         {
 801                                 monitor.SetSelectivePaths(message.Uris,message.Added,message.Removed);
 802
 803                         }
 804
 805                 }
 806
 807
 808                 private bool _pollStarted = false;
 809
 810                 //SMELL: Doing so much work for notifications in the shell is wrong
 811                 //The notifications should be moved to their own view/viewmodel pair
 812                 //and different templates should be used for different message types
 813                 //This will also allow the addition of extra functionality, eg. actions
 814                 //
 815                 public void Handle(Notification notification)
 816                 {
 817                         UpdateStatus();
 818
 819                         if (!Settings.ShowDesktopNotifications)
 820                                 return;
 821
 822                         if (notification is PollNotification)
 823                         {
 824                                 _pollStarted = true;
 825                                 return;
 826                         }
 827                         if (notification is CloudNotification)
 828                         {
 829                                 if (!_pollStarted)
 830                                         return;
 831                                 _pollStarted= false;
 832                                 notification.Title = "Pithos";
 833                                 notification.Message = "Start Synchronisation";
 834                         }
 835
 836                         if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
 837                                 return;
 838
 839                         BalloonIcon icon;
 840                         switch (notification.Level)
 841                         {
 842                                 case TraceLevel.Error:
 843                                         icon = BalloonIcon.Error;
 844                                         break;
 845                                 case TraceLevel.Info:
 846                                 case TraceLevel.Verbose:
 847                                         icon = BalloonIcon.Info;
 848                                         break;
 849                                 case TraceLevel.Warning:
 850                                         icon = BalloonIcon.Warning;
 851                                         break;
 852                                 default:
 853                                         icon = BalloonIcon.None;
 854                                         break;
 855                         }
 856
 857                         if (Settings.ShowDesktopNotifications)
 858                         {
 859                                 var tv = (ShellView) GetView();
 860                                 var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon};
 861                                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 862 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 863                         }
 864                 }
 865                 #endregion
 866
 867                 public void Handle(ShowFilePropertiesEvent message)
 868                 {
 869                         if (message == null)
 870                                 throw new ArgumentNullException("message");
 871                         if (String.IsNullOrWhiteSpace(message.FileName) )
 872                                 throw new ArgumentException("message");
 873                         Contract.EndContractBlock();
 874
 875                         var fileName = message.FileName;
 876                         //TODO: Display file properties for non-container folders
 877                         if (File.Exists(fileName))
 878                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 879                                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 880                         else if (Directory.Exists(fileName))
 881                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 882                         {
 883                                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 884                                 if (IsContainer(path))
 885                                         ShowContainerProperties(path);
 886                                 else
 887                                         ShowFileProperties(path);
 888                         }
 889                 }
 890
 891                 private bool IsContainer(string path)
 892                 {
 893                         var matchingFolders = from account in _accounts
 894                                                                   from rootFolder in Directory.GetDirectories(account.AccountPath)
 895                                                                   where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 896                                                                   select rootFolder;
 897                         return matchingFolders.Any();
 898                 }
 899
 900                 public FileStatus GetFileStatus(string localFileName)
 901                 {
 902                         if (String.IsNullOrWhiteSpace(localFileName))
 903                                 throw new ArgumentNullException("localFileName");
 904                         Contract.EndContractBlock();
 905
 906                         var statusKeeper = IoC.Get<IStatusKeeper>();
 907                         var status=statusKeeper.GetFileStatus(localFileName);
 908                         return status;
 909                 }
 910         }
 911 }