protected void ValidateModel <TFormFileModel>(TFormFileModel logUploadData)
{
foreach (var requiredFormFileProperty in FormFileAttributeHelper.GetRequiredFormFileProperties(typeof(TFormFileModel)))
{
var fileName = requiredFormFileProperty.GetValue(logUploadData);
if (!TempFileService.Files.Contains(fileName))
{
ModelState.AddModelError(requiredFormFileProperty.Name,
$"File '{requiredFormFileProperty.Name}' with name: '{fileName}' not found in request.");
}
}
}
protected async Task <KeyValueAccumulator> BuildMultiPartFormAccumulator <TModel>() where TModel : class, new()
{
var httpContextRequest = HttpContext.Request;
// Used to accumulate all the form url encoded key value pairs in the request
var formAccumulator = new KeyValueAccumulator();
var boundary = Request.GetBoundary(_defaultFormOptions);
var reader = new MultipartReader(boundary, httpContextRequest.Body);
Logger.LogDebug("Reading next section");
var section = await reader.ReadNextSectionAsync();
while (section != null)
{
var hasContentDispositionHeader =
ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out var contentDisposition);
if (hasContentDispositionHeader)
{
Logger.LogDebug("Content Disposition Header: {0}", section.ContentDisposition);
if (contentDisposition.IsFileContentDisposition())
{
var fileName = contentDisposition.FileName.Value;
var formFileNames = FormFileAttributeHelper.GetFormFileNames(typeof(TModel));
if (!formFileNames.Contains(contentDisposition.Name.Value))
{
Logger.LogWarning($"Unknown file '{contentDisposition.Name.Value}' with fileName: '{fileName}' is being ignored.");
// Drains any remaining section body that has not been consumed and
// reads the headers for the next section.
section = await reader.ReadNextSectionAsync();
continue;
}
formAccumulator.Append(contentDisposition.Name.Value, fileName);
var path = await TempFileService.CreateFromStreamAsync(fileName, section.Body);
Logger.LogInformation($"Copied the uploaded file '{fileName}' to path: '{path}'");
}
else if (contentDisposition.IsFormDataContentDisposition())
{
// Content-Disposition: form-data; name="key"
// Do not limit the key name length here because the
// multipart headers length limit is already in effect.
var key = HeaderUtilities.RemoveQuotes(contentDisposition.Name);
Logger.LogDebug("Retrieving value for {0}", key);
var encoding = section.GetEncoding();
var streamReader = new StreamReader(
section.Body,
encoding,
detectEncodingFromByteOrderMarks: true,
bufferSize: 1024,
leaveOpen: true);
using (streamReader)
{
// 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.Value, 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();
}
return(formAccumulator);
}
