public async Task <(Stream stream, string fileName, string contentType)> DownloadFileAsync(
Guid id, ClaimsPrincipal user, CancellationToken cancellationToken)
{
StoredFile file = await _dbContext.StoredFiles.SingleAsync(f => f.Id == id, cancellationToken);
FileAccessUtils.CheckAccess(file, user);
Stream stream = await _blobStorageService.DownloadBlobAsync(file.StoredBlobId, user, cancellationToken);
return(stream, file.FileName, file.FileContentType);
}
private BlobClient GetBlobClient(Guid blobId, ClaimsPrincipal user)
{
// The blob folder is the tenant or user id
// Personal accounts -> user id, organizational accounts -> tenant id
string name = $"{FileAccessUtils.GetBlobFolder(user)}/{blobId}";
BlobContainerClient containerClient = _blobServiceClient.GetBlobContainerClient(_options.FileContainerName);
BlobClient blobClient = containerClient.GetBlobClient(name);
return(blobClient);
}
public async Task DeleteFileAsync(Guid id, ClaimsPrincipal user, CancellationToken cancellationToken)
{
StoredFile file = await _dbContext.StoredFiles.SingleAsync(f => f.Id == id, cancellationToken);
FileAccessUtils.CheckAccess(file, user);
_dbContext.StoredFiles.Remove(file);
// These two operations cannot be canceled, so no cancellation token
await _blobStorageService.DeleteBlobAsync(file.StoredBlobId, user);
await _dbContext.SaveChangesAsync();
}