public async Task <IFileDescriptor?> AddFileFromStream(Stream file, long size, string fileName, string?defaultfileId = null)
{
if (file == null)
{
return(null);
}
string fileId = defaultfileId != null ? defaultfileId : Ulid.NewUlid().ToString();
string contentType = BlobStorageUtils.GetContentType(fileName);
var containerClient = await GetBlobContainerAsync();
BlobClient blobClient = containerClient.GetBlobClient(fileId);
// Blob MetaData
IDictionary <string, string> metadata = new Dictionary <string, string>
{
{ FileNameMetaDataAttribut, fileName },
};
// Blob ContentType
BlobHttpHeaders blobHeaders = new BlobHttpHeaders()
{
ContentType = contentType,
};
file.Position = 0;
await blobClient.UploadAsync(file, blobHeaders, metadata);
return(new FileDescriptor()
{
Id = fileId,
FileName = fileName,
Size = size,
ContentType = contentType
});
}
public async Task <Stream?> GetThumbnailStreamAsync(string fileId, bool fill, int?x, int?y)
{
var key = string.Format("{0}{1}_{2}_{3}", fileId, fill ? "_fill" : "", x, y);
var containerClient = await GetBlobContainerAsync();
BlobClient blobClient = containerClient.GetBlobClient(key);
if (!await blobClient.ExistsAsync())
{
var sourceDownloadInfo = await GetFileStreamAsync(fileId);
if (sourceDownloadInfo == null) // source not found
{
throw new ArgumentException(string.Format("FileId: {0} not found", fileId));
}
// create new thumbnail and persist it
var thumbBitmap = BlobStorageUtils.BuildThumbnailBitmap(sourceDownloadInfo, fill, x, y);
if (thumbBitmap != null)
{
MemoryStream memoryStream = new MemoryStream();
thumbBitmap.Save(memoryStream, ImageFormat.Jpeg);
await AddFileFromStream(memoryStream, memoryStream.Length, key, blobClient.Name);
memoryStream.Seek(0, SeekOrigin.Begin);
return(memoryStream);
}
else
{
return(null);
}
}
else
{
// thumbnail already exists
var downloadedBlob = await blobClient.DownloadAsync();
return(downloadedBlob.Value.Content);
}
}