Add missing REST Webhook implemenation (#843)

* Add Webhook API models, REST implementation, and Socket bridges.

* Remove token overrides from REST.

Leaving that as a Webhook package only feature.

* Add Webhook API models, REST implementation, and Socket bridges.

* Remove token overrides from REST.

Leaving that as a Webhook package only feature.

* Webhook core implementation.

* Webhook REST implementation.

* Webhook client implementation.

* Add channel bucket id.

src/Discord.Net.Rest/API/Common/Webhook.cs

@@ -0,0 +1,25 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class Webhook
+    {
+        [JsonProperty("id")]
+        public ulong Id { get; set; }
+        [JsonProperty("channel_id")]
+        public ulong ChannelId { get; set; }
+        [JsonProperty("token")]
+        public string Token { get; set; }
+
+        [JsonProperty("name")]
+        public Optional<string> Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<string> Avatar { get; set; }
+        [JsonProperty("guild_id")]
+        public Optional<ulong> GuildId { get; set; }
+
+        [JsonProperty("user")]
+        public Optional<User> Creator { get; set; }
+    }
+}

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

@@ -0,0 +1,14 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest
+{
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    internal class CreateWebhookParams
+    {
+        [JsonProperty("name")]
+        public string Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<Image?> Avatar { get; set; }
+    }
+}

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

@@ -0,0 +1,16 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest
+{
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    internal class ModifyWebhookParams
+    {
+        [JsonProperty("name")]
+        public Optional<string> Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<Image?> Avatar { get; set; }
+        [JsonProperty("channel_id")]
+        public Optional<ulong> ChannelId { get; set; }
+    }
+}

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

@@ -1,7 +1,7 @@
 #pragma warning disable CS1591
-using Discord.Net.Rest;
 using System.Collections.Generic;
 using System.IO;
+using Discord.Net.Rest;
 
 namespace Discord.API.Rest
 {
@@ -15,6 +15,7 @@ namespace Discord.API.Rest
         public Optional<bool> IsTTS { get; set; }
         public Optional<string> Username { get; set; }
         public Optional<string> AvatarUrl { get; set; }
+        public Optional<Embed[]> Embeds { get; set; }
 
         public UploadWebhookFileParams(Stream file)
         {
@@ -25,6 +26,7 @@ namespace Discord.API.Rest
         {
             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)
@@ -35,6 +37,8 @@ namespace Discord.API.Rest
                 d["username"] = Username.Value;
             if (AvatarUrl.IsSpecified)
                 d["avatar_url"] = AvatarUrl.Value;
+            if (Embeds.IsSpecified)
+                d["embeds"] = Embeds.Value;
             return d;
         }
     }