public void TestAesStream()
{
var baseStream = new MemoryStream();
var key = new byte[]
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
var encryptStream = new AesStream(baseStream, key);
var plaintext = Encoding.UTF8.GetBytes("Hello, world!");
encryptStream.Write(plaintext, 0, plaintext.Length);
baseStream.Seek(0, SeekOrigin.Begin);
var decryptStream = new AesStream(baseStream, key);
byte[] buffer = new byte[plaintext.Length];
decryptStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual("Hello, world!", Encoding.UTF8.GetString(buffer));
}
public void TestAesStream()
{
var baseStream = new MemoryStream();
var key = new byte[]
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
var encryptStream = new AesStream(baseStream, key);
var plaintext = Encoding.UTF8.GetBytes("Hello, world!");
encryptStream.Write(plaintext, 0, plaintext.Length);
baseStream.Seek(0, SeekOrigin.Begin);
var decryptStream = new AesStream(baseStream, key);
byte[] buffer = new byte[plaintext.Length];
decryptStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual("Hello, world!", Encoding.UTF8.GetString(buffer));
}
public void AesStreamWrite()
{
var data = Encoding.ASCII.GetBytes("Hello");
Assert.IsTrue(data.ToArray().SequenceEqual(new byte[] { 72, 101, 108, 108, 111 }));
var password = SecurityHelper.ToSecureString("MyPassword");
using (var baseStream = new MemoryStream())
using (var aesStream = new AesStream(baseStream, password, SecurityHelper.GetSaltKeys(password).GetBytes(16)))
{
aesStream.Write(data, 0, data.Length);
aesStream.Position = 0;
var cryptedData = new byte[baseStream.Length];
baseStream.Read(cryptedData, 0, cryptedData.Length);
Assert.IsTrue(cryptedData.ToArray().SequenceEqual(new byte[] { 238, 75, 117, 248, 55 }));
}
}
/// <summary>
/// Read a specified clipboard data, encrypt and save it into a file.
/// </summary>
/// <param name="clipboardReader">The <see cref="ClipboardReader"/> used to read the data.</param>
/// <param name="identifier">The data identifier.</param>
/// <param name="clipboardDataPath">The full path to the clipboard data folder.</param>
private void WriteClipboardDataToFile(ClipboardReader clipboardReader, DataIdentifier identifier, string
clipboardDataPath)
{
Requires.NotNull(clipboardReader, nameof(clipboardReader));
Requires.NotNull(identifier, nameof(identifier));
Requires.NotNullOrWhiteSpace(clipboardDataPath, nameof(clipboardDataPath));
var dataFilePath = Path.Combine(clipboardDataPath, $"{identifier.Identifier}.dat");
if (File.Exists(dataFilePath))
{
Logger.Instance.Fatal(new FileLoadException($"The file {dataFilePath} already exists."));
}
var dataPassword =
SecurityHelper.ToSecureString(SecurityHelper.EncryptString(SecurityHelper.ToSecureString(
identifier.Identifier.ToString(
))));
Requires.NotNull(dataPassword, nameof(dataPassword));
clipboardReader.BeginRead(identifier.FormatName);
Requires.IsTrue(clipboardReader.IsReadable);
Requires.IsTrue(clipboardReader.CanReadNextBlock());
using (var fileStream = File.OpenWrite(dataFilePath))
using (var aesStream = new AesStream(fileStream, dataPassword,
SecurityHelper.GetSaltKeys(dataPassword).GetBytes(16)))
{
aesStream.AutoDisposeBaseStream = false;
while (clipboardReader.CanReadNextBlock())
{
var buffer = clipboardReader.ReadNextBlock();
aesStream.Write(buffer, 0, buffer.Length);
}
aesStream.Position = 0;
}
clipboardReader.EndRead();
}
/// <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());
}