UploadFile.cs

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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
 
namespace Terraria.ModLoader.IO
{
    public class UploadFile
    {
        public UploadFile() {
            ContentType = "application/octet-stream";
        }
 
        public string Name { get; set; }
 
        public string Filename { get; set; }
 
        public string ContentType { get; set; }
 
        public byte[] Content { get; set; }
 
        public static byte[] UploadFiles(string address, IEnumerable<UploadFile> files, NameValueCollection values) {
            var request = WebRequest.Create(address);
            request.Method = "POST";
            var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
            request.ContentType = "multipart/form-data; boundary=" + boundary;
            boundary = "--" + boundary;
            using (var requestStream = request.GetRequestStream()) {
                WriteValues(requestStream, values, boundary);
                WriteFiles(requestStream, files, boundary);
                var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + "--");
                requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);
            }
            using (var response = request.GetResponse())
            using (var responseStream = response.GetResponseStream())
            using (var stream = new MemoryStream()) {
                responseStream.CopyTo(stream);
                return stream.ToArray();
            }
        }
 
        public static byte[] GetUploadFilesRequestData(IEnumerable<UploadFile> files, NameValueCollection values, string boundary) {
            boundary = "--" + boundary;
            using (var requestStream = new MemoryStream()) {
                WriteValues(requestStream, values, boundary);
                WriteFiles(requestStream, files, boundary);
                var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + "--");
                requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);
                return requestStream.ToArray();
            }
        }
 
        private static void WriteValues(Stream requestStream, NameValueCollection values, string boundary) {
            if (values == null)
                return;
 
            // Write the values
            foreach (string name in values.Keys) {
                var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
                requestStream.Write(buffer, 0, buffer.Length);
                buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}", name, Environment.NewLine));
                requestStream.Write(buffer, 0, buffer.Length);
                buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);
                requestStream.Write(buffer, 0, buffer.Length);
            }
        }
 
        private static void WriteFiles(Stream requestStream, IEnumerable<UploadFile> files, string boundary) {
            if (files == null)
                return;
 
            // Write the files
            foreach (var file in files) {
                var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
                requestStream.Write(buffer, 0, buffer.Length);
                buffer = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"{2}", file.Name, file.Filename, Environment.NewLine));
                requestStream.Write(buffer, 0, buffer.Length);
                buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}", file.ContentType, Environment.NewLine));
                requestStream.Write(buffer, 0, buffer.Length);
                requestStream.Write(file.Content, 0, file.Content.Length);
                buffer = Encoding.ASCII.GetBytes(Environment.NewLine);
                requestStream.Write(buffer, 0, buffer.Length);
            }
        }
    }
}