public async Task <ActionResult> OnDownloadFileAsync(
string id,
[FromServices] BlobService blobService)
{
var s = new MemoryStream();
var storage = blobService.BuildStorage();
var encodedJson = id.Split("&")[1];
var bytes = Convert.FromBase64String(encodedJson);
var json = Encoding.UTF8.GetString(bytes);
BlobInfo blobInfo = JsonSerializer.Deserialize <BlobInfo>(json);
using (Stream ss = await storage.OpenReadAsync(id))
{
await ss.CopyToAsync(s);
var contentDisposition = new System.Net.Mime.ContentDisposition
{
FileName = blobInfo.FileName,
Inline = true,
};
HttpContext.Response.Headers.Add("Content-Disposition", contentDisposition.ToString());
return(File(s.ToArray(), blobInfo.ContentType));
}
}
public async static Task <FileUploadResult> UploadSingleFileAsBlob(BlobService blobService, IFormFile file)
{
var storage = blobService.BuildStorage();
var guid = blobService.GenerateBlobId();
var blobMeta = new BlobInfo
{
FileName = file.FileName,
ContentType = file.ContentType,
};
var blobMetaJSON = JsonSerializer.Serialize(blobMeta);
var bytes = Encoding.UTF8.GetBytes(blobMetaJSON);
var encodedJSON = Convert.ToBase64String(bytes);
var fullId = $"{guid}&{encodedJSON}".ToString();
using (var ms = new MemoryStream()) {
await file.CopyToAsync(ms);
await storage.WriteAsync(fullId, ms.ToArray());
}
var idList = new List <string>();
idList.Add(fullId);
return(new FileUploadResult(true, idList));
}
public async Task <ActionResult <FileUploadResult> > OnUploadFileAsync(
IList <IFormFile> files,
[FromServices] BlobService blobService)
{
var uploads = files.Select(file => UploadFileController.UploadSingleFileAsBlob(blobService, file));
var uploadResults = await Task.WhenAll(uploads);
return(new FileUploadResult(true, uploadResults.SelectMany(x => x.BlobNames).ToList()));
}
