/// <summary>
/// Gets upload content from underlying storage.
/// </summary>
/// <param name="tenantId">The tenant whose upload is returned.</param>
/// <param name="storageHierarchy">Location of created upload. E.g. { "Uploads" > "Users" }.</param>
/// <param name="upload">Identifies upload whose content and content type are retrieved.</param>
/// <param name="unitOfWork">Unit of work.</param>
/// <returns>Upload content.</returns>
public UploadContent Read(long tenantId, List <string> storageHierarchy, string upload, IUnitOfWork unitOfWork = null)
{
// Get Azure storage configuration
AzureStorageConfiguration configuration = _azureConfigurationService.GetStorageConfiguration(tenantId, storageHierarchy, upload);
// Retrieve storage account from connection string
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(configuration.ConnectionString);
// Create the blob client
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container
CloudBlobContainer blobContainer = blobClient.GetContainerReference(configuration.BlobContainerName);
// Retrieve reference to blob
CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference(configuration.BlobPath);
// Save blob contents to byte array
byte[] content = null;
using (MemoryStream ms = new MemoryStream())
{
blockBlob.DownloadToStreamAsync(ms).Wait();
ms.Seek(0, SeekOrigin.Begin);
content = new byte[ms.Length];
ms.Read(content, 0, (int)ms.Length);
}
// Construct upload content return type
return(new UploadContent {
Content = content, ContentType = blockBlob.Properties.ContentType
});
}
/// <summary>
/// Creates upload in underlying storage.
/// </summary>
/// <param name="upload">The upload to create in underlying storage.</param>
/// <param name="storageHierarchy">Location of created upload. E.g. { "Uploads" > "Users" }.</param>
/// <param name="unitOfWork">Unit of work.</param>
public void Create(Upload upload, List <string> storageHierarchy, IUnitOfWork unitOfWork = null)
{
// Get Azure storage configuration
AzureStorageConfiguration configuration = _azureConfigurationService.GetStorageConfiguration(upload, storageHierarchy);
// Retrieve storage account from connection string
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(configuration.ConnectionString);
// Create the blob client
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container
CloudBlobContainer blobContainer = blobClient.GetContainerReference(configuration.BlobContainerName);
// Create the container if it doesn't already exist
bool create = blobContainer.CreateIfNotExistsAsync().Result;
// Retrieve reference to blob
CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference(configuration.BlobPath);
// Set blob content type
blockBlob.Properties.ContentType = upload.ContentType;
// Upload content to block blob
blockBlob.UploadFromByteArrayAsync(upload.Content, 0, upload.Content.Length).Wait();
}
/// <summary>
/// Gets list of uploads found at a storage location.
/// </summary>
/// <param name="tenantId">Tenant identifier.</param>
/// <param name="storageHierarchy">Location of files. E.g. { "Uploads" > "Users" }.</param>
/// <param name="unitOfWork">Unit of work.</param>
/// <returns>List of files.</returns>
public List <string> List(long tenantId, List <string> storageHierarchy, IUnitOfWork unitOfWork = null)
{
// Get Azure storage configuration
AzureStorageConfiguration configuration = _azureConfigurationService.GetStorageConfiguration(tenantId, storageHierarchy);
// Retrieve storage account from connection string
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(configuration.ConnectionString);
// Create the blob client
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container
CloudBlobContainer blobContainer = blobClient.GetContainerReference(configuration.BlobContainerName);
CloudBlobDirectory blobDirectory = blobContainer.GetDirectoryReference(configuration.BlobPath);
// Get uploads
List <string> uploads = new List <string>();
BlobContinuationToken token = null;
do
{
BlobResultSegment results = blobDirectory.ListBlobsSegmentedAsync(token).Result;
foreach (IListBlobItem item in results.Results)
{
if (ItemIsBlockBlob(item))
{
uploads.Add(GetBlockBlobFileName((CloudBlockBlob)item));
}
}
token = results.ContinuationToken;
}while (token != null);
// Return the result
return(uploads);
}
/// <summary>
/// Deletes an upload from underlying storage.
/// </summary>
/// <param name="upload">The upload to delete from underlying storage.</param>
/// <param name="storageHierarchy">Location of created upload. E.g. { "Uploads" > "Users" }.</param>
/// <param name="unitOfWork">Unit of work.</param>
public void Delete(Upload upload, List <string> storageHierarchy, IUnitOfWork unitOfWork = null)
{
// Get Azure storage configuration
AzureStorageConfiguration configuration = _azureConfigurationService.GetStorageConfiguration(upload, storageHierarchy);
// Retrieve storage account from connection string
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(configuration.ConnectionString);
// Create the blob client
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container
CloudBlobContainer blobContainer = blobClient.GetContainerReference(configuration.BlobContainerName);
// Retrieve reference to blob
CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference(configuration.BlobPath);
// If block blob exists, delete it
if (blockBlob.ExistsAsync().Result)
{
blockBlob.DeleteAsync().Wait();
}
}
