GuilhermeStracini/POC-react-dotnet-SplitUpload

using Microsoft.Net.Http.Headers;
using System;
using System.IO;

namespace PocSplitUpload.UI.Helpers
{
    public static class MultipartRequestHelper
    {
        // Content-Type: multipart/form-data; boundary="----WebKitFormBoundarymx2fSWqWSd0OxQqq"
        // The spec says 70 characters is a reasonable limit.
        public static string GetBoundary(MediaTypeHeaderValue contentType, int lengthLimit)
        {
            var boundary = HeaderUtilities.RemoveQuotes(contentType.Boundary).ToString();
            if (string.IsNullOrWhiteSpace(boundary))
                throw new InvalidDataException("Missing content-type boundary.");
            if (boundary.Length > lengthLimit)
                throw new InvalidDataException($"Multipart boundary length limit {lengthLimit} exceeded.");
            return boundary;
        }

        public static bool IsMultipartContentType(string contentType)
        {
            return !string.IsNullOrEmpty(contentType)
                   && contentType.IndexOf("multipart/", StringComparison.OrdinalIgnoreCase) >= 0;
        }

        public static bool HasFileContentDisposition(ContentDispositionHeaderValue contentDisposition)
        {
            // Content-Disposition: form-data; name="anyName"; filename="someFile.jpg"
            return contentDisposition != null
                   && contentDisposition.DispositionType.Equals("form-data")
                   && (!string.IsNullOrEmpty(contentDisposition.FileName.ToString())
                       || !string.IsNullOrEmpty(contentDisposition.FileNameStar.ToString()));
        }
    }
}