/// <summary>
/// Try to authenticate to the current cloud storage provider
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
internal async Task TryAuthenticateAsync()
{
var isConnectedToInternet = SystemInfoHelper.CheckForInternetConnection();
if (isConnectedToInternet && CurrentCloudStorageProvider != null)
{
await CurrentCloudStorageProvider.TryAuthenticateAsync();
}
}
/// <inheritdoc/>
public async void Initialize(IServiceSettingProvider settingProvider)
{
_settingProvider = settingProvider;
var synchronizeInterval = _settingProvider.GetSetting <int>("SynchronizationInterval");
var providers = _settingProvider.GetSetting <List <ICloudStorageProvider> >("CloudStorageProviders");
var isConnectedToInternet = SystemInfoHelper.CheckForInternetConnection();
var cloudStorageProviders = new List <CloudStorageProvider>();
_synchronizeTimer = new DispatcherTimer();
_synchronizeTimer.Interval = TimeSpan.FromMinutes(synchronizeInterval);
_synchronizeTimer.Tick += SynchronizeTimer_Tick;
_cloudStorageProviders = new List <ICloudStorageProvider>();
foreach (var provider in providers)
{
if (_cloudStorageProviders.Any(p => string.Compare(p.CloudServiceName, provider.CloudServiceName, StringComparison.OrdinalIgnoreCase) == 0))
{
Logger.Instance.Fatal(new Exception($"The cloud storage provider '{provider.CloudServiceName}' already exists."));
}
if (isConnectedToInternet)
{
await provider.TryAuthenticateAsync();
}
_cloudStorageProviders.Add(provider);
cloudStorageProviders.Add(new CloudStorageProvider(provider.CloudServiceName, provider.CloudServiceIcon));
}
CloudStorageProviders = cloudStorageProviders.OrderBy(s => s.Name).ToList();
if (isConnectedToInternet && CurrentCloudStorageProvider != null)
{
await CurrentCloudStorageProvider.TryAuthenticateAsync();
}
_synchronizeTimer.Start();
Logger.Instance.Information($"{GetType().Name} initialized.");
}
private bool CanExecuteSendLogsCommand()
{
return(SystemInfoHelper.CheckForInternetConnection());
}
/// <summary>
/// Force to synchronize that data with the cloud.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
internal async Task SynchronizeAsync()
{
if (IsSynchronizing)
{
return;
}
Logger.Instance.Information("Synchronization with the cloud started.");
IsSynchronizing = true;
if (CurrentCloudStorageProvider == null)
{
Logger.Instance.Warning("The user is not logged to any cloud storage provider. The synchronization stopped.");
IsSynchronizing = false;
return;
}
if (!CoreHelper.IsUnitTesting() && !SystemInfoHelper.CheckForInternetConnection())
{
Logger.Instance.Warning("There is no internet connection. The synchronization stopped.");
IsSynchronizing = false;
return;
}
SynchronizationStarted?.Invoke(this, new EventArgs());
try
{
if (!await CurrentCloudStorageProvider.TryAuthenticateAsync())
{
Logger.Instance.Warning("The user is not authenticated correctly. Consider unlink the app and connect again. The synchronization stopped.");
IsSynchronizing = false;
SynchronizationEnded?.Invoke(this, new EventArgs());
return;
}
var userId = SecurityHelper.ToSecureString(await CurrentCloudStorageProvider.GetUserIdAsync());
if (string.IsNullOrWhiteSpace(SecurityHelper.ToUnsecureString(userId)))
{
Logger.Instance.Warning("The user's id from the cloud storage provider has not been found. The synchronization stopped.");
IsSynchronizing = false;
SynchronizationEnded?.Invoke(this, new EventArgs());
SynchronizationFailed?.Invoke(this, new EventArgs());
return;
}
Logger.Instance.Information("Freezing the data before synchronize.");
var dataService = ServiceLocator.GetService <DataService>();
var cloudDataEntryFromServer = new List <CloudDataEntry>();
var cloudAppFolder = await CurrentCloudStorageProvider.GetAppFolderAsync();
var cloudDataEntryFilePath = Path.Combine(cloudAppFolder.FullPath, Consts.DataEntryFileName);
var cloudDataPassword = SecurityHelper.ToSecureString(SecurityHelper.EncryptString(userId, SecurityHelper.ToSecureString(await CurrentCloudStorageProvider.GetUserNameAsync())));
var localFrozenDataEntries = DataHelper.FromByteArray <AsyncObservableCollection <DataEntry> >(DataHelper.ToByteArray(dataService.DataEntries));
var localFrozenCache = DataHelper.FromByteArray <List <DataEntryCache> >(DataHelper.ToByteArray(dataService.Cache));
// Download data from server.
if (cloudAppFolder.Files.Any(file => file.FullPath == cloudDataEntryFilePath))
{
Logger.Instance.Information("Downloading the data entry file from the server.");
try
{
using (var memoryStream = new MemoryStream())
{
await CurrentCloudStorageProvider.DownloadFileAsync(cloudDataEntryFilePath, memoryStream);
memoryStream.Position = 0;
using (var aesStream = new AesStream(memoryStream, cloudDataPassword, SecurityHelper.GetSaltKeys(cloudDataPassword).GetBytes(16)))
{
var data = new byte[aesStream.Length];
aesStream.Read(data, 0, data.Length);
cloudDataEntryFromServer = JsonConvert.DeserializeObject <List <CloudDataEntry> >(Encoding.UTF8.GetString(data));
}
}
}
catch (Exception exception)
{
Logger.Instance.Warning($"Unable to download or read the data file entry from the cloud for the following reason : {exception.Message}");
IsSynchronizing = false;
SynchronizationEnded?.Invoke(this, new EventArgs());
SynchronizationFailed?.Invoke(this, new EventArgs());
return;
}
}
else
{
Logger.Instance.Information("There is no data entry file on the server yet.");
}
// Synchronize locally the data. The result must corresponds to what we will have locally and on the server at the end of the synchronization process.
var cloudDataEntryToServer = dataService.DifferenceLocalAndCloudDataEntries(cloudDataEntryFromServer);
// Download the needed data from the server to the local machine.
Logger.Instance.Information("Downloading the needed data from the server to the local machine.");
var dataToDownload = cloudDataEntryFromServer.Cast <DataEntryBase>().Except(localFrozenDataEntries, (item1, item2) => item1.Identifier == item2.Identifier).ToList();
var taskList = new List <Task>();
foreach (var cloudDataEntry in dataToDownload)
{
if (dataToDownload.Any(data => localFrozenCache.Any(item => data.Identifier == item.Identifier && item.Status == DataEntryStatus.Deleted)))
{
continue;
}
foreach (var dataEntryDataIdentifier in cloudDataEntry.DataIdentifiers)
{
var task = DownloadDataFileAsync(dataService.ClipboardDataPath, cloudAppFolder, cloudDataPassword, dataEntryDataIdentifier);
taskList.Add(task);
}
}
await Task.WhenAll(taskList);
// Delete the needed data from the server
Logger.Instance.Information("Deleting the needed data from the server.");
taskList = new List <Task>();
foreach (var dataServiceDataEntry in localFrozenDataEntries.Where(item => !item.CanSynchronize))
{
foreach (var dataEntryDataIdentifier in dataServiceDataEntry.DataIdentifiers)
{
var task = DeleteFileAsync(cloudAppFolder, dataEntryDataIdentifier);
taskList.Add(task);
}
}
await Task.WhenAll(taskList);
taskList = new List <Task>();
foreach (var cacheEntry in localFrozenCache.Where(item => item.Status == DataEntryStatus.Deleted))
{
var dataEntry = cloudDataEntryFromServer.SingleOrDefault(item => item.Identifier == cacheEntry.Identifier);
if (dataEntry != null)
{
foreach (var dataEntryDataIdentifier in dataEntry.DataIdentifiers)
{
var task = DeleteFileAsync(cloudAppFolder, dataEntryDataIdentifier);
taskList.Add(task);
}
}
}
await Task.WhenAll(taskList);
await dataService.MakeCacheSynchronized(cloudDataEntryToServer, true, localFrozenCache);
localFrozenDataEntries = DataHelper.FromByteArray <AsyncObservableCollection <DataEntry> >(DataHelper.ToByteArray(dataService.DataEntries));
localFrozenCache = DataHelper.FromByteArray <List <DataEntryCache> >(DataHelper.ToByteArray(dataService.Cache));
// Upload the needed data from the server to the local machine
Logger.Instance.Information("Uploading the needed data from the server to the local machine.");
var dataToUpload = localFrozenDataEntries.Cast <DataEntryBase>().Except(cloudDataEntryFromServer, (item1, item2) => item1.Identifier == item2.Identifier);
taskList = new List <Task>();
foreach (var dataEntry in dataToUpload)
{
var localDataEntry = localFrozenDataEntries.Single(item => item.Identifier == dataEntry.Identifier);
if (!localDataEntry.CanSynchronize || localDataEntry.Thumbnail.Type == ThumbnailDataType.Files)
{
continue;
}
foreach (var dataEntryDataIdentifier in dataEntry.DataIdentifiers)
{
var task = UploadDataFileAsync(dataService.ClipboardDataPath, cloudAppFolder, cloudDataPassword, dataEntryDataIdentifier);
taskList.Add(task);
}
}
await Task.WhenAll(taskList);
// Upload the new data to the server.
Logger.Instance.Information("Uploading the data entry file to the server.");
using (var memoryStream = new MemoryStream())
using (var aesStream = new AesStream(memoryStream, cloudDataPassword, SecurityHelper.GetSaltKeys(cloudDataPassword).GetBytes(16)))
{
var data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(cloudDataEntryToServer));
aesStream.Write(data, 0, data.Length);
aesStream.Position = 0;
await CurrentCloudStorageProvider.UploadFileAsync(memoryStream, cloudDataEntryFilePath);
}
await dataService.MakeCacheSynchronized(cloudDataEntryToServer, false, localFrozenCache);
}
catch (Exception exception)
{
Logger.Instance.Warning($"Unable to synchronize for the following reason : {exception.Message}. {exception.InnerException?.Message}");
SynchronizationFailed?.Invoke(this, new EventArgs());
}
_synchronizeTimer.Stop();
_synchronizeTimer.Start();
IsSynchronizing = false;
SynchronizationEnded?.Invoke(this, new EventArgs());
}
