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

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="ShellViewModel.cs" company="GRNet">
   4  *
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  *   1. Redistributions of source code must retain the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer.
  14  *
  15  *   2. Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials
  18  *      provided with the distribution.
  19  *
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * The views and conclusions contained in the software and
  35  * documentation are those of the authors and should not be
  36  * interpreted as representing official policies, either expressed
  37  * or implied, of GRNET S.A.
  38  * </copyright>
  39  * -----------------------------------------------------------------------
  40  */
  41 #endregion
  42 using System.Collections.Concurrent;
  43 using System.Diagnostics;
  44 using System.Diagnostics.Contracts;
  45 using System.IO;
  46 using System.Net;
  47 using System.Reflection;
  48 using System.Runtime.InteropServices;
  49 using System.ServiceModel;
  50 using System.Threading.Tasks;
  51 using System.Windows;
  52 using System.Windows.Controls.Primitives;
  53 using Caliburn.Micro;
  54 using Hardcodet.Wpf.TaskbarNotification;
  55 using Pithos.Client.WPF.Configuration;
  56 using Pithos.Client.WPF.FileProperties;
  57 using Pithos.Client.WPF.Preferences;
  58 using Pithos.Client.WPF.Properties;
  59 using Pithos.Client.WPF.SelectiveSynch;
  60 using Pithos.Client.WPF.Services;
  61 using Pithos.Client.WPF.Shell;
  62 using Pithos.Core;
  63 using Pithos.Core.Agents;
  64 using Pithos.Interfaces;
  65 using System;
  66 using System.Collections.Generic;
  67 using System.Linq;
  68 using Pithos.Network;
  69 using StatusService = Pithos.Client.WPF.Services.StatusService;
  70
  71 namespace Pithos.Client.WPF {
  72         using System.ComponentModel.Composition;
  73
  74
  75         ///<summary>
  76         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  77         /// The shell also hosts the status service called by shell extensions to retrieve file info
  78         ///</summary>
  79         ///<remarks>
  80         /// It is a strange "shell" as its main visible element is an icon instead of a window
  81         /// The shell subscribes to the following events:
  82         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  83         /// * SelectiveSynchChanges: Notifies that the user made changes to the selective synch folders for an account. Raised by the Selective Synch dialog. Located here because the monitors are here
  84         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  85         ///</remarks>
  86         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  87         [Export(typeof(IShell))]
  88         public class ShellViewModel : Screen, IStatusNotification, IShell,
  89                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  90         {
  91                 //The Status Checker provides the current synch state
  92                 //TODO: Could we remove the status checker and use events in its place?
  93                 private readonly IStatusChecker _statusChecker;
  94                 private readonly IEventAggregator _events;
  95
  96                 public PithosSettings Settings { get; private set; }
  97
  98
  99                 private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
 100                 ///<summary>
 101                 /// Dictionary of account monitors, keyed by account
 102                 ///</summary>
 103                 ///<remarks>
 104                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
 105                 /// retrieve account and boject info
 106                 ///</remarks>
 107                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
 108                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
 109                 public ConcurrentDictionary<string, PithosMonitor> Monitors
 110                 {
 111                         get { return _monitors; }
 112                 }
 113
 114
 115                 ///<summary>
 116                 /// The status service is used by Shell extensions to retrieve file status information
 117                 ///</summary>
 118                 //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
 119                 private ServiceHost _statusService;
 120
 121                 //Logging in the Pithos client is provided by log4net
 122                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
 123
 124                 //Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
 125                 private Lazy<FileVersionInfo> _fileVersion;
 126
 127                 ///<summary>
 128                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
 129                 ///</summary>
 130                 ///<remarks>
 131                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
 132                 ///</remarks>
 133                 [ImportingConstructor]
 134                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
 135                 {
 136                         try
 137                         {
 138
 139                                 _windowManager = windowManager;
 140                                 //CHECK: Caliburn doesn't need explicit command construction
 141                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
 142                                 _statusChecker = statusChecker;
 143                                 //The event subst
 144                                 _events = events;
 145                                 _events.Subscribe(this);
 146
 147                                 Settings = settings;
 148
 149                                 Proxy.SetFromSettings(settings);
 150
 151                                 StatusMessage = "In Synch";
 152
 153                                 _fileVersion=  new Lazy<FileVersionInfo>(() =>
 154                                 {
 155                                         Assembly assembly = Assembly.GetExecutingAssembly();
 156                                         var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 157                                         return fileVersion;
 158                                 });
 159                                 _accounts.CollectionChanged += (sender, e) =>
 160                                                                                                    {
 161                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 162                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 163                                                                                                    };
 164
 165                         }
 166                         catch (Exception exc)
 167                         {
 168                                 Log.Error("Error while starting the ShellViewModel",exc);
 169                                 throw;
 170                         }
 171                 }
 172
 173
 174                 protected override void OnActivate()
 175                 {
 176                         base.OnActivate();
 177
 178
 179
 180                         StartMonitoring();
 181                 }
 182
 183
 184
 185                 private async void StartMonitoring()
 186                 {
 187                         try
 188                         {
 189                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 190                                 await TaskEx.WhenAll(accounts);
 191                                 _statusService = StatusService.Start();
 192
 193 /*
 194                                 foreach (var account in Settings.Accounts)
 195                                 {
 196                                         await MonitorAccount(account);
 197                                 }
 198 */
 199
 200                         }
 201                         catch (AggregateException exc)
 202                         {
 203                                 exc.Handle(e =>
 204                                 {
 205                                         Log.Error("Error while starting monitoring", e);
 206                                         return true;
 207                                 });
 208                                 throw;
 209                         }
 210                 }
 211
 212                 protected override void OnDeactivate(bool close)
 213                 {
 214                         base.OnDeactivate(close);
 215                         if (close)
 216                         {
 217                                 StatusService.Stop(_statusService);
 218                                 _statusService = null;
 219                         }
 220                 }
 221
 222                 public Task MonitorAccount(AccountSettings account)
 223                 {
 224                         return Task.Factory.StartNew(() =>
 225                         {
 226                                 PithosMonitor monitor;
 227                                 var accountName = account.AccountName;
 228
 229                                 if (_monitors.TryGetValue(accountName, out monitor))
 230                                 {
 231                                         //If the account is active
 232                                         if (account.IsActive)
 233                                                 //Start the monitor. It's OK to start an already started monitor,
 234                                                 //it will just ignore the call
 235                                                 StartMonitor(monitor).Wait();
 236                                         else
 237                                         {
 238                                                 //If the account is inactive
 239                                                 //Stop and remove the monitor
 240                                                 RemoveMonitor(accountName);
 241                                         }
 242                                         return;
 243                                 }
 244
 245
 246                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 247                                 monitor = new PithosMonitor
 248                                                           {
 249                                                                   UserName = accountName,
 250                                                                   ApiKey = account.ApiKey,
 251                                                                   StatusNotification = this,
 252                                                                   RootPath = account.RootPath
 253                                                           };
 254                                 //PithosMonitor uses MEF so we need to resolve it
 255                                 IoC.BuildUp(monitor);
 256
 257                                 monitor.AuthenticationUrl = account.ServerUrl;
 258
 259                                 _monitors[accountName] = monitor;
 260
 261                                 if (account.IsActive)
 262                                 {
 263                                         //Don't start a monitor if it doesn't have an account and ApiKey
 264                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 265                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 266                                                 return;
 267                                         StartMonitor(monitor);
 268                                 }
 269                         });
 270                 }
 271
 272
 273                 protected override void OnViewLoaded(object view)
 274                 {
 275                         UpdateStatus();
 276                         var window = (Window)view;
 277                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 278                         base.OnViewLoaded(view);
 279                 }
 280
 281
 282                 #region Status Properties
 283
 284                 private string _statusMessage;
 285                 public string StatusMessage
 286                 {
 287                         get { return _statusMessage; }
 288                         set
 289                         {
 290                                 _statusMessage = value;
 291                                 NotifyOfPropertyChange(() => StatusMessage);
 292                         }
 293                 }
 294
 295                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 296                 public ObservableConcurrentCollection<AccountInfo> Accounts
 297                 {
 298                         get { return _accounts; }
 299                 }
 300
 301                 public bool HasAccounts
 302                 {
 303                         get { return _accounts.Count > 0; }
 304                 }
 305
 306
 307                 public string OpenFolderCaption
 308                 {
 309                         get
 310                         {
 311                                 return (_accounts.Count == 0)
 312                                                 ? "No Accounts Defined"
 313                                                 : "Open Pithos Folder";
 314                         }
 315                 }
 316
 317                 private string _pauseSyncCaption="Pause Synching";
 318                 public string PauseSyncCaption
 319                 {
 320                         get { return _pauseSyncCaption; }
 321                         set
 322                         {
 323                                 _pauseSyncCaption = value;
 324                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 325                         }
 326                 }
 327
 328                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 329                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 330                 {
 331                         get { return _recentFiles; }
 332                 }
 333
 334
 335                 private string _statusIcon="../Images/Pithos.ico";
 336                 public string StatusIcon
 337                 {
 338                         get { return _statusIcon; }
 339                         set
 340                         {
 341                                 //TODO: Ensure all status icons use the Pithos logo
 342                                 _statusIcon = value;
 343                                 NotifyOfPropertyChange(() => StatusIcon);
 344                         }
 345                 }
 346
 347                 #endregion
 348
 349                 #region Commands
 350
 351         public void ShowPreferences()
 352         {
 353             ShowPreferences(null);
 354         }
 355
 356                 public void ShowPreferences(string currentTab)
 357                 {
 358                         //Settings.Reload();
 359                     var preferences = new PreferencesViewModel(_windowManager, _events, this, Settings,currentTab);
 360                     _windowManager.ShowDialog(preferences);
 361
 362                 }
 363
 364                 public void AboutPithos()
 365                 {
 366                         var about = new AboutViewModel();
 367                         _windowManager.ShowWindow(about);
 368                 }
 369
 370                 public void SendFeedback()
 371                 {
 372                         var feedBack =  IoC.Get<FeedbackViewModel>();
 373                         _windowManager.ShowWindow(feedBack);
 374                 }
 375
 376                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 377
 378                 public void OpenPithosFolder()
 379                 {
 380                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 381                         if (account == null)
 382                                 return;
 383                         Process.Start(account.RootPath);
 384                 }
 385
 386                 public void OpenPithosFolder(AccountInfo account)
 387                 {
 388                         Process.Start(account.AccountPath);
 389                 }
 390
 391
 392 /*
 393                 public void GoToSite()
 394                 {
 395                         var site = Properties.Settings.Default.PithosSite;
 396                         Process.Start(site);
 397                 }
 398 */
 399
 400                 public void GoToSite(AccountInfo account)
 401                 {
 402                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 403                                 account.SiteUri,account.Token,
 404                                 account.UserName);*/
 405                         Process.Start(account.SiteUri);
 406                 }
 407
 408                 public void ShowFileProperties()
 409                 {
 410                         var account = Settings.Accounts.First(acc => acc.IsActive);
 411                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 412                         var files=dir.GetFiles();
 413                         var r=new Random();
 414                         var idx=r.Next(0, files.Length);
 415                         ShowFileProperties(files[idx].FullName);
 416                 }
 417
 418                 public void ShowFileProperties(string filePath)
 419                 {
 420                         if (String.IsNullOrWhiteSpace(filePath))
 421                                 throw new ArgumentNullException("filePath");
 422                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 423                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 424                         Contract.EndContractBlock();
 425
 426                         var pair=(from monitor in  Monitors
 427                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 428                                                                    select monitor).FirstOrDefault();
 429                         var accountMonitor = pair.Value;
 430
 431                         if (accountMonitor == null)
 432                                 return;
 433
 434                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 435
 436
 437
 438                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 439                         _windowManager.ShowWindow(fileProperties);
 440                 }
 441
 442                 public void ShowContainerProperties()
 443                 {
 444                         var account = Settings.Accounts.First(acc => acc.IsActive);
 445                         var dir = new DirectoryInfo(account.RootPath);
 446                         var fullName = (from folder in dir.EnumerateDirectories()
 447                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 448                                                         select folder.FullName).First();
 449                         ShowContainerProperties(fullName);
 450                 }
 451
 452                 public void ShowContainerProperties(string filePath)
 453                 {
 454                         if (String.IsNullOrWhiteSpace(filePath))
 455                                 throw new ArgumentNullException("filePath");
 456                         if (!Directory.Exists(filePath))
 457                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 458                         Contract.EndContractBlock();
 459
 460                         var pair=(from monitor in  Monitors
 461                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 462                                                                    select monitor).FirstOrDefault();
 463                         var accountMonitor = pair.Value;
 464                         var info = accountMonitor.GetContainerInfo(filePath);
 465
 466
 467
 468                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 469                         _windowManager.ShowWindow(containerProperties);
 470                 }
 471
 472                 public void SynchNow()
 473                 {
 474                         var agent = IoC.Get<PollAgent>();
 475                         agent.SynchNow();
 476                 }
 477
 478                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 479                 {
 480                         if (currentInfo==null)
 481                                 throw new ArgumentNullException("currentInfo");
 482                         Contract.EndContractBlock();
 483
 484                         var monitor = Monitors[currentInfo.Account];
 485                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 486                         return newInfo;
 487                 }
 488
 489                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 490                 {
 491                         if (container == null)
 492                                 throw new ArgumentNullException("container");
 493                         Contract.EndContractBlock();
 494
 495                         var monitor = Monitors[container.Account];
 496                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 497                         return newInfo;
 498                 }
 499
 500
 501                 public void ToggleSynching()
 502                 {
 503                         bool isPaused=false;
 504                         foreach (var pair in Monitors)
 505                         {
 506                                 var monitor = pair.Value;
 507                                 monitor.Pause = !monitor.Pause;
 508                                 isPaused = monitor.Pause;
 509                         }
 510
 511                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 512                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 513                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 514                 }
 515
 516                 public void ExitPithos()
 517                 {
 518                         foreach (var pair in Monitors)
 519                         {
 520                                 var monitor = pair.Value;
 521                                 monitor.Stop();
 522                         }
 523
 524                         ((Window)GetView()).Close();
 525                 }
 526                 #endregion
 527
 528
 529                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 530                         {
 531                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 532                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 533                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 534                         }.ToDictionary(s => s.Status);
 535
 536                 readonly IWindowManager _windowManager;
 537
 538
 539                 ///<summary>
 540                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 541                 ///</summary>
 542                 public void UpdateStatus()
 543                 {
 544                         var pithosStatus = _statusChecker.GetPithosStatus();
 545
 546                         if (_iconNames.ContainsKey(pithosStatus))
 547                         {
 548                                 var info = _iconNames[pithosStatus];
 549                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 550
 551
 552
 553                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
 554                         }
 555
 556                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 557                 }
 558
 559
 560
 561                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 562                 {
 563                         return Task.Factory.StartNew(() =>
 564                         {
 565                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 566                                 {
 567                                         try
 568                                         {
 569                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 570
 571                                                 monitor.Start();
 572                                         }
 573                                         catch (WebException exc)
 574                                         {
 575                                                 if (AbandonRetry(monitor, retries))
 576                                                         return;
 577
 578                                                 HttpStatusCode statusCode =HttpStatusCode.OK;
 579                                                 var response = exc.Response as HttpWebResponse;
 580                                                 if(response!=null)
 581                                                         statusCode = response.StatusCode;
 582
 583                                                 switch (statusCode)
 584                                                 {
 585                                                         case HttpStatusCode.Unauthorized:
 586                                                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 587                                                                                                                         monitor.UserName);
 588                                                                 Log.Error(message, exc);
 589                                                         var account = Settings.Accounts.Find(acc => acc.AccountName == monitor.UserName);
 590                                                         account.IsExpired = true;
 591                                 Notify(new ExpirationNotification(account));
 592                                                                 //TryAuthorize(monitor.UserName, retries).Wait();
 593                                                                 break;
 594                                                         case HttpStatusCode.ProxyAuthenticationRequired:
 595                                                                 TryAuthenticateProxy(monitor,retries);
 596                                                                 break;
 597                                                         default:
 598                                                                 TryLater(monitor, exc, retries);
 599                                                                 break;
 600                                                 }
 601                                         }
 602                                         catch (Exception exc)
 603                                         {
 604                                                 if (AbandonRetry(monitor, retries))
 605                                                         return;
 606
 607                                                 TryLater(monitor,exc,retries);
 608                                         }
 609                                 }
 610                         });
 611                 }
 612
 613                 private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 614                 {
 615                         Execute.OnUIThread(() =>
 616                                                                    {
 617                                                                            var proxyAccount = IoC.Get<ProxyAccountViewModel>();
 618                                                                                 proxyAccount.Settings = this.Settings;
 619                                                                            if (true != _windowManager.ShowDialog(proxyAccount))
 620                                                                                    return;
 621                                                                            StartMonitor(monitor, retries);
 622                                                                            NotifyOfPropertyChange(() => Accounts);
 623                                                                    });
 624                 }
 625
 626                 private bool AbandonRetry(PithosMonitor monitor, int retries)
 627                 {
 628                         if (retries > 1)
 629                         {
 630                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 631                                                                                         monitor.UserName);
 632                                 _events.Publish(new Notification
 633                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 634                                 return true;
 635                         }
 636                         return false;
 637                 }
 638
 639
 640                 public async Task TryAuthorize(string userName, int retries)
 641                 {
 642                         _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 });
 643
 644                         try
 645                         {
 646
 647                                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 648
 649                                 var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
 650                 //The server may return credentials for a different account
 651                             var monitor = _monitors[account.AccountName];
 652                                 account.ApiKey = credentials.Password;
 653                 monitor.ApiKey = credentials.Password;
 654                             account.IsExpired = false;
 655                                 Settings.Save();
 656                                 TaskEx.Delay(10000).ContinueWith(_=>
 657                             StartMonitor(monitor, retries + 1));
 658                                 NotifyOfPropertyChange(()=>Accounts);
 659                         }
 660                         catch (AggregateException exc)
 661                         {
 662                                 string message = String.Format("API Key retrieval for {0} failed", userName);
 663                                 Log.Error(message, exc.InnerException);
 664                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 665                         }
 666                         catch (Exception exc)
 667                         {
 668                                 string message = String.Format("API Key retrieval for {0} failed", userName);
 669                                 Log.Error(message, exc);
 670                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 671                         }
 672
 673                 }
 674
 675                 private static bool IsUnauthorized(WebException exc)
 676                 {
 677                         if (exc==null)
 678                                 throw new ArgumentNullException("exc");
 679                         Contract.EndContractBlock();
 680
 681                         var response = exc.Response as HttpWebResponse;
 682                         if (response == null)
 683                                 return false;
 684                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 685                 }
 686
 687                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 688                 {
 689                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 690                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 691                         _events.Publish(new Notification
 692                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 693                         Log.Error(message, exc);
 694                 }
 695
 696
 697                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 698                 {
 699                         StatusMessage = status;
 700
 701                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 702                 }
 703
 704                 public void NotifyChangedFile(string filePath)
 705                 {
 706                         var entry = new FileEntry {FullPath=filePath};
 707                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 708                         FileEntry popped;
 709                         while (files.Count > 5)
 710                                 files.TryTake(out popped);
 711                         files.TryAdd(entry);
 712                 }
 713
 714                 public void NotifyAccount(AccountInfo account)
 715                 {
 716                         if (account== null)
 717                                 return;
 718                         //TODO: What happens to an existing account whose Token has changed?
 719                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 720                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 721                                 Uri.EscapeDataString(account.UserName));
 722
 723                         if (Accounts.All(item => item.UserName != account.UserName))
 724                                 Accounts.TryAdd(account);
 725
 726                 }
 727
 728                 public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 729                 {
 730                         if (conflictFiles == null)
 731                                 return;
 732                         if (!conflictFiles.Any())
 733                                 return;
 734
 735                         UpdateStatus();
 736                         //TODO: Create a more specific message. For now, just show a warning
 737                         NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 738
 739                 }
 740
 741                 public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 742                 {
 743                         if (files == null)
 744                                 return;
 745                         if (!files.Any())
 746                                 return;
 747
 748                         StatusMessage = message;
 749
 750                         _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 751                 }
 752
 753                 public void Notify(Notification notification)
 754                 {
 755                         _events.Publish(notification);
 756                 }
 757
 758
 759                 public void RemoveMonitor(string accountName)
 760                 {
 761                         if (String.IsNullOrWhiteSpace(accountName))
 762                                 return;
 763
 764                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 765                         _accounts.TryRemove(accountInfo);
 766
 767                         PithosMonitor monitor;
 768                         if (Monitors.TryRemove(accountName, out monitor))
 769                         {
 770                                 monitor.Stop();
 771                         }
 772                 }
 773
 774                 public void RefreshOverlays()
 775                 {
 776                         foreach (var pair in Monitors)
 777                         {
 778                                 var monitor = pair.Value;
 779
 780                                 var path = monitor.RootPath;
 781
 782                                 if (String.IsNullOrWhiteSpace(path))
 783                                         continue;
 784
 785                                 if (!Directory.Exists(path) && !File.Exists(path))
 786                                         continue;
 787
 788                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 789
 790                                 try
 791                                 {
 792                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 793                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 794                                                                                                  pathPointer, IntPtr.Zero);
 795                                 }
 796                                 finally
 797                                 {
 798                                         Marshal.FreeHGlobal(pathPointer);
 799                                 }
 800                         }
 801                 }
 802
 803                 #region Event Handlers
 804
 805                 public void Handle(SelectiveSynchChanges message)
 806                 {
 807                         var accountName = message.Account.AccountName;
 808                         PithosMonitor monitor;
 809                         if (_monitors.TryGetValue(accountName, out monitor))
 810                         {
 811                                 monitor.SetSelectivePaths(message.Uris,message.Added,message.Removed);
 812
 813                         }
 814
 815                 }
 816
 817
 818                 private bool _pollStarted = false;
 819
 820                 //SMELL: Doing so much work for notifications in the shell is wrong
 821                 //The notifications should be moved to their own view/viewmodel pair
 822                 //and different templates should be used for different message types
 823                 //This will also allow the addition of extra functionality, eg. actions
 824                 //
 825                 public void Handle(Notification notification)
 826                 {
 827                         UpdateStatus();
 828
 829                         if (!Settings.ShowDesktopNotifications)
 830                                 return;
 831
 832                         if (notification is PollNotification)
 833                         {
 834                                 _pollStarted = true;
 835                                 return;
 836                         }
 837                         if (notification is CloudNotification)
 838                         {
 839                                 if (!_pollStarted)
 840                                         return;
 841                                 _pollStarted= false;
 842                                 notification.Title = "Pithos";
 843                                 notification.Message = "Start Synchronisation";
 844                         }
 845
 846                         if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
 847                                 return;
 848
 849                         BalloonIcon icon;
 850                         switch (notification.Level)
 851                         {
 852                                 case TraceLevel.Error:
 853                                         icon = BalloonIcon.Error;
 854                                         break;
 855                                 case TraceLevel.Info:
 856                                 case TraceLevel.Verbose:
 857                                         icon = BalloonIcon.Info;
 858                                         break;
 859                                 case TraceLevel.Warning:
 860                                         icon = BalloonIcon.Warning;
 861                                         break;
 862                                 default:
 863                                         icon = BalloonIcon.None;
 864                                         break;
 865                         }
 866
 867                         if (Settings.ShowDesktopNotifications)
 868                         {
 869                                 var tv = (ShellView) GetView();
 870                             System.Action clickAction = null;
 871                 if (notification is ExpirationNotification)
 872                 {
 873                     clickAction = ()=>ShowPreferences("AccountTab");
 874                 }
 875                                 var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon,ClickAction=clickAction};
 876                                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 877 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 878                         }
 879                 }
 880                 #endregion
 881
 882                 public void Handle(ShowFilePropertiesEvent message)
 883                 {
 884                         if (message == null)
 885                                 throw new ArgumentNullException("message");
 886                         if (String.IsNullOrWhiteSpace(message.FileName) )
 887                                 throw new ArgumentException("message");
 888                         Contract.EndContractBlock();
 889
 890                         var fileName = message.FileName;
 891                         //TODO: Display file properties for non-container folders
 892                         if (File.Exists(fileName))
 893                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 894                                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 895                         else if (Directory.Exists(fileName))
 896                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 897                         {
 898                                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 899                                 if (IsContainer(path))
 900                                         ShowContainerProperties(path);
 901                                 else
 902                                         ShowFileProperties(path);
 903                         }
 904                 }
 905
 906                 private bool IsContainer(string path)
 907                 {
 908                         var matchingFolders = from account in _accounts
 909                                                                   from rootFolder in Directory.GetDirectories(account.AccountPath)
 910                                                                   where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 911                                                                   select rootFolder;
 912                         return matchingFolders.Any();
 913                 }
 914
 915                 public FileStatus GetFileStatus(string localFileName)
 916                 {
 917                         if (String.IsNullOrWhiteSpace(localFileName))
 918                                 throw new ArgumentNullException("localFileName");
 919                         Contract.EndContractBlock();
 920
 921                         var statusKeeper = IoC.Get<IStatusKeeper>();
 922                         var status=statusKeeper.GetFileStatus(localFileName);
 923                         return status;
 924                 }
 925         }
 926 }