private async Task WriteDataToStreamAsync(Stream stream, MultipartField part)
{
if (part is MultipartFileField)
{
using (var inputStream = new FileStream(((MultipartFileField)part).FilePath, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Delete))
{
await inputStream.CopyToAsync(stream);
}
}
else if (part is MultipartTextField)
{
await WriteToStreamAsync(stream, Encoding.UTF8.GetBytes(((MultipartTextField)part).Value));
}
}
private async Task WritePartHeaderAsync(Stream stream, string name, MultipartField part)
{
var contentType = part.ContentType;
await WriteToStreamAsync(stream, MULTIPART_HEADER_CONTENT_DISPOSITION_AND_NAME_BYTES);
await WriteToStreamAsync(stream, Encoding.UTF8.GetBytes(Uri.EscapeDataString(name)));
var isFile = part is MultipartFileField;
if (isFile)
{
contentType = contentType ?? "application/octet-stream";
var field = part as MultipartFileField;
if (!string.IsNullOrEmpty(field.FileName))
{
await WriteToStreamAsync(stream, MULTIPART_HEADER_END_NAME_AND_FILENAME);
await WriteToStreamAsync(stream, Encoding.UTF8.GetBytes(field.FileName.Replace("\"", "")));
}
}
await WriteToStreamAsync(stream, MULTIPART_HEADER_END);
await WriteToStreamAsync(stream, CRLF_BYTES);
if (!string.IsNullOrEmpty(contentType))
{
await WriteToStreamAsync(stream, MULTIPART_HEADER_CONTENT_TYPE);
await WriteToStreamAsync(stream, Encoding.UTF8.GetBytes(contentType));
if (!isFile)
{
await WriteToStreamAsync(stream, MULTIPART_HEADER_CONTENT_TYPE_END_CHARSET);
await WriteToStreamAsync(stream, Encoding.UTF8.GetBytes("utf-8"));
}
await WriteToStreamAsync(stream, CRLF_BYTES);
}
}