some fix

Discord/DiscordWebHook.cs

@@ -0,0 +1,103 @@
+using System;
+using System.IO;
+using System.Net;
+using System.Text;
+
+namespace Discord.Webhook
+{
+    public class DiscordWebhook
+    {
+        /// <summary>
+        /// Webhook url
+        /// </summary>
+        public string Url { get; set; }
+
+        private void AddField(MemoryStream stream, string bound, string cDisposition, string cType, byte[] data)
+        {
+            string prefix = stream.Length > 0 ? "\r\n--" : "--";
+            string fBegin = $"{prefix}{bound}\r\n";
+
+            byte[] fBeginBuffer = Utils.Encode(fBegin);
+            byte[] cDispositionBuffer = Utils.Encode(cDisposition);
+            byte[] cTypeBuffer = Utils.Encode(cType);
+
+            stream.Write(fBeginBuffer, 0, fBeginBuffer.Length);
+            stream.Write(cDispositionBuffer, 0, cDispositionBuffer.Length);
+            stream.Write(cTypeBuffer, 0, cTypeBuffer.Length);
+            stream.Write(data, 0, data.Length);
+        }
+
+        private void SetJsonPayload(MemoryStream stream, string bound, string json)
+        {
+            string cDisposition = "Content-Disposition: form-data; name=\"payload_json\"\r\n";
+            string cType = "Content-Type: application/octet-stream\r\n\r\n";
+            AddField(stream, bound, cDisposition, cType, Utils.Encode(json));
+        }
+
+        private void SetFile(MemoryStream stream, string bound, int index, FileInfo file)
+        {
+            string cDisposition = $"Content-Disposition: form-data; name=\"file_{index}\"; filename=\"{file.Name}\"\r\n";
+            string cType = "Content-Type: application/octet-stream\r\n\r\n";
+            AddField(stream, bound, cDisposition, cType, File.ReadAllBytes(file.FullName));
+        }
+
+        /// <summary>
+        /// Send webhook message
+        /// </summary>
+        public void Send(DiscordMessage message, params FileInfo[] files)
+        {
+            if (string.IsNullOrEmpty(Url))
+                throw new ArgumentNullException("Invalid Webhook URL.");
+
+            string bound = "------------------------" + DateTime.Now.Ticks.ToString("x");
+            WebClient webhookRequest = new WebClient();
+            webhookRequest.Headers.Add("Content-Type", "multipart/form-data; boundary=" + bound);
+            
+            MemoryStream stream = new MemoryStream();
+            for (int i = 0; i < files.Length; i++)
+                SetFile(stream, bound, i, files[i]);
+
+            string json = message.ToString();
+            SetJsonPayload(stream, bound, json);
+
+            byte[] bodyEnd = Utils.Encode($"\r\n--{bound}--");
+            stream.Write(bodyEnd, 0, bodyEnd.Length);
+
+            //byte[] beginBodyBuffer = Encoding.UTF8.GetBytes("--" + bound + "\r\n");
+            //stream.Write(beginBodyBuffer, 0, beginBodyBuffer.Length);
+            //bool flag = file != null && file.Exists;
+            //if (flag)
+            //{
+            //    string fileBody = "Content-Disposition: form-data; name=\"file\"; filename=\"" + file.Name + "\"\r\nContent-Type: application/octet-stream\r\n\r\n";
+            //    byte[] fileBodyBuffer = Encoding.UTF8.GetBytes(fileBody);
+            //    stream.Write(fileBodyBuffer, 0, fileBodyBuffer.Length);
+            //    byte[] fileBuffer = File.ReadAllBytes(file.FullName);
+            //    stream.Write(fileBuffer, 0, fileBuffer.Length);
+            //    string fileBodyEnd = "\r\n--" + bound + "\r\n";
+            //    byte[] fileBodyEndBuffer = Encoding.UTF8.GetBytes(fileBodyEnd);
+            //    stream.Write(fileBodyEndBuffer, 0, fileBodyEndBuffer.Length);
+            //}
+            //string jsonBody = string.Concat(new string[]
+            //{
+            //    "Content-Disposition: form-data; name=\"payload_json\"\r\nContent-Type: application/json\r\n\r\n",
+            //    string.Format("{0}\r\n", message),
+            //    "--",
+            //    bound,
+            //    "--"
+            //});
+            //byte[] jsonBodyBuffer = Encoding.UTF8.GetBytes(jsonBody);
+            //stream.Write(jsonBodyBuffer, 0, jsonBodyBuffer.Length);
+
+            try
+            {
+                webhookRequest.UploadData(this.Url, stream.ToArray());
+            }
+            catch (WebException ex)
+            {
+                throw new WebException(Utils.Decode(ex.Response.GetResponseStream()));
+            }
+
+            stream.Dispose();
+        }
+    }
+}