Added Discord.Net.Webhook

src/Discord.Net.Rest/API/Rest/UploadWebhookFileParams.cs

@@ -0,0 +1,41 @@
+#pragma warning disable CS1591
+using Discord.Net.Rest;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Discord.API.Rest
+{
+    internal class UploadWebhookFileParams
+    {
+        public Stream File { get; }
+
+        public Optional<string> Filename { get; set; }
+        public Optional<string> Content { get; set; }
+        public Optional<string> Nonce { get; set; }
+        public Optional<bool> IsTTS { get; set; }
+        public Optional<string> Username { get; set; }
+        public Optional<string> AvatarUrl { get; set; }
+
+        public UploadWebhookFileParams(Stream file)
+        {
+            File = file;
+        }
+
+        public IReadOnlyDictionary<string, object> ToDictionary()
+        {
+            var d = new Dictionary<string, object>();
+            d["file"] = new MultipartFile(File, Filename.GetValueOrDefault("unknown.dat"));
+            if (Content.IsSpecified)
+                d["content"] = Content.Value;
+            if (IsTTS.IsSpecified)
+                d["tts"] = IsTTS.Value.ToString();
+            if (Nonce.IsSpecified)
+                d["nonce"] = Nonce.Value;
+            if (Username.IsSpecified)
+                d["username"] = Username.Value;
+            if (AvatarUrl.IsSpecified)
+                d["avatar_url"] = AvatarUrl.Value;
+            return d;
+        }
+    }
+}