public async Task <IActionResult> Upload()
{
if (!FileUploadHelper.IsMultipartContentType(Request.ContentType))
{
return(BadRequest($"Expected a multipart request, but got {Request.ContentType}"));
}
// Used to accumulate all the form url encoded key value pairs in the
// request.
var formAccumulator = new KeyValueAccumulator();
string targetFilePath = null;
var boundary = FileUploadHelper.GetBoundary(
MediaTypeHeaderValue.Parse(Request.ContentType),
_defaultFormOptions.MultipartBoundaryLengthLimit);
var reader = new MultipartReader(boundary, HttpContext.Request.Body);
var section = await reader.ReadNextSectionAsync();
while (section != null)
{
ContentDispositionHeaderValue contentDisposition;
var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);
if (hasContentDispositionHeader)
{
if (FileUploadHelper.HasFileContentDisposition(contentDisposition))
{
targetFilePath = Path.GetTempFileName();
using (var targetStream = System.IO.File.Create(targetFilePath))
{
await section.Body.CopyToAsync(targetStream);
_logger.LogInformation($"Copied the uploaded file '{targetFilePath}'");
}
}
else if (FileUploadHelper.HasFormDataContentDisposition(contentDisposition))
{
// Content-Disposition: form-data; name="key"
//
// value
// Do not limit the key name length here because the
// multipart headers length limit is already in effect.
var key = HeaderUtilities.RemoveQuotes(contentDisposition.Name);
var encoding = GetEncoding(section);
using (var streamReader = new StreamReader(
section.Body,
encoding,
detectEncodingFromByteOrderMarks: true,
bufferSize: 1024,
leaveOpen: true))
{
// The value length limit is enforced by MultipartBodyLengthLimit
var value = await streamReader.ReadToEndAsync();
if (String.Equals(value, "undefined", StringComparison.OrdinalIgnoreCase))
{
value = String.Empty;
}
formAccumulator.Append(key.ToString(), value);
if (formAccumulator.ValueCount > _defaultFormOptions.ValueCountLimit)
{
throw new InvalidDataException($"Form key count limit {_defaultFormOptions.ValueCountLimit} exceeded.");
}
}
}
}
// Drains any remaining section body that has not been consumed and
// reads the headers for the next section.
section = await reader.ReadNextSectionAsync();
}
var model = new FileModel();
// Bind form data to a model
var formValueProvider = new FormValueProvider(
BindingSource.Form,
new FormCollection(formAccumulator.GetResults()),
CultureInfo.CurrentCulture);
var bindingSuccessful = await TryUpdateModelAsync(model, prefix : "",
valueProvider : formValueProvider);
if (!bindingSuccessful)
{
if (!ModelState.IsValid)
{
return(BadRequest(ModelState));
}
}
var uploadedData = targetFilePath;// ToDo: safely save to a non temporary location
var user = await _userManager.GetUserAsync(User);
var userFolder = !string.IsNullOrWhiteSpace(user.UserFolder) ? user.UserFolder : "anon";
var path = Path.Combine(AppDomain.CurrentDomain.GetData("PublicDirectory").ToString(), userFolder).ToString();
using (var fs = new FileService(_crivConfig, _encryptor, _environment))
{
await fs.CopyFile(path, new Guid().ToString(), uploadedData, uploadedData);
}
return(Json(uploadedData));
}
