Add new thread creation properties

src/Discord.Net.Core/Entities/Channels/ITextChannel.cs

@@ -141,11 +141,13 @@ namespace Discord
         ///     </para>
         /// </param>
         /// <param name="message">The message which to start the thread from.</param>
+        /// <param name="invitable">Whether non-moderators can add other non-moderators to a thread; only available when creating a private thread</param>
+        /// <param name="slowmode">The amount of seconds a user has to wait before sending another message (0-21600)</param>
         /// <param name="options">The options to be used when sending the request.</param>
         /// <returns>
         ///     A task that represents the asynchronous create operation. The task result contains a <see cref="IThreadChannel"/>
         /// </returns>
         Task<IThreadChannel> CreateThreadAsync(string name, ThreadType type = ThreadType.PublicThread, ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay,
-            IMessage message = null, RequestOptions options = null);
+            IMessage message = null, bool? invitable = null, int? slowmode = null, RequestOptions options = null);
     }
 }

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

@@ -11,6 +11,12 @@ namespace Discord.API.Rest
         public ThreadArchiveDuration Duration { get; set; }
 
         [JsonProperty("type")]
-        public Optional<ThreadType> Type { get; set; }
+        public ThreadType Type { get; set; }
+
+        [JsonProperty("invitable")]
+        public Optional<bool> Invitable { get; set; }
+
+        [JsonProperty("rate_limit_per_user")]
+        public Optional<int?> Ratelimit { get; set; }
     }
 }

src/Discord.Net.Rest/Entities/Channels/RestTextChannel.cs

@@ -268,9 +268,9 @@ namespace Discord.Rest
         ///     A task that represents the asynchronous create operation. The task result contains a <see cref="IThreadChannel"/>
         /// </returns>
         public async Task<RestThreadChannel> CreateThreadAsync(string name, ThreadType type = ThreadType.PublicThread,
-            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, RequestOptions options = null)
+            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, bool? invitable = null, int? slowmode = null, RequestOptions options = null)
         {
-            var model = await ThreadHelper.CreateThreadAsync(Discord, this, name, type, autoArchiveDuration, message, options);
+            var model = await ThreadHelper.CreateThreadAsync(Discord, this, name, type, autoArchiveDuration, message, invitable, slowmode, options);
             return RestThreadChannel.Create(Discord, Guild, model);
         }
         #endregion
@@ -286,8 +286,8 @@ namespace Discord.Rest
         async Task<IReadOnlyCollection<IWebhook>> ITextChannel.GetWebhooksAsync(RequestOptions options)
             => await GetWebhooksAsync(options).ConfigureAwait(false);
 
-        async Task<IThreadChannel> ITextChannel.CreateThreadAsync(string name, ThreadType type, ThreadArchiveDuration autoArchiveDuration, IMessage message, RequestOptions options)
-            => await CreateThreadAsync(name, type, autoArchiveDuration, message, options);
+        async Task<IThreadChannel> ITextChannel.CreateThreadAsync(string name, ThreadType type, ThreadArchiveDuration autoArchiveDuration, IMessage message, bool? invitable, int? slowmode, RequestOptions options)
+            => await CreateThreadAsync(name, type, autoArchiveDuration, message, invitable, slowmode, options);
         #endregion
 
         #region IMessageChannel
@@ -387,7 +387,7 @@ namespace Discord.Rest
         }
         #endregion
 
-        #region ITextChannel
+        #region INestedChannel
         /// <inheritdoc />
         async Task<ICategoryChannel> INestedChannel.GetCategoryAsync(CacheMode mode, RequestOptions options)
         {

src/Discord.Net.Rest/Entities/Channels/ThreadHelper.cs

@@ -9,7 +9,7 @@ namespace Discord.Rest
     internal static class ThreadHelper
     {
         public static async Task<Model> CreateThreadAsync(BaseDiscordClient client, ITextChannel channel, string name, ThreadType type = ThreadType.PublicThread,
-            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, RequestOptions options = null)
+            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, bool? invitable = null, int? slowmode = null, RequestOptions options = null)
         {
             var features = channel.Guild.Features;
             if (autoArchiveDuration == ThreadArchiveDuration.OneWeek && !features.HasFeature(GuildFeature.SevenDayThreadArchive))
@@ -25,7 +25,9 @@ namespace Discord.Rest
             {
                 Name = name,
                 Duration = autoArchiveDuration,
-                Type = type
+                Type = type,
+                Invitable = invitable.HasValue ? invitable.Value : Optional<bool>.Unspecified,
+                Ratelimit = slowmode.HasValue ? slowmode.Value : Optional<int?>.Unspecified,
             };
 
             Model model;

src/Discord.Net.WebSocket/Entities/Channels/SocketTextChannel.cs

@@ -113,9 +113,9 @@ namespace Discord.WebSocket
         ///     A task that represents the asynchronous create operation. The task result contains a <see cref="IThreadChannel"/>
         /// </returns>
         public async Task<SocketThreadChannel> CreateThreadAsync(string name, ThreadType type = ThreadType.PublicThread,
-            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, RequestOptions options = null)
+            ThreadArchiveDuration autoArchiveDuration = ThreadArchiveDuration.OneDay, IMessage message = null, bool? invitable = null, int? slowmode = null, RequestOptions options = null)
         {
-            var model = await ThreadHelper.CreateThreadAsync(Discord, this, name, type, autoArchiveDuration, message, options);
+            var model = await ThreadHelper.CreateThreadAsync(Discord, this, name, type, autoArchiveDuration, message, invitable, slowmode, options);
 
             var thread = (SocketThreadChannel)Guild.AddOrUpdateChannel(Discord.State, model);
 
@@ -345,8 +345,8 @@ namespace Discord.WebSocket
         async Task<IReadOnlyCollection<IWebhook>> ITextChannel.GetWebhooksAsync(RequestOptions options)
             => await GetWebhooksAsync(options).ConfigureAwait(false);
         /// <inheritdoc />
-        async Task<IThreadChannel> ITextChannel.CreateThreadAsync(string name, ThreadType type, ThreadArchiveDuration autoArchiveDuration, IMessage message, RequestOptions options)
-            => await CreateThreadAsync(name, type, autoArchiveDuration, message, options);
+        async Task<IThreadChannel> ITextChannel.CreateThreadAsync(string name, ThreadType type, ThreadArchiveDuration autoArchiveDuration, IMessage message, bool? invitable, int? slowmode, RequestOptions options)
+            => await CreateThreadAsync(name, type, autoArchiveDuration, message, invitable, slowmode, options);
         #endregion
 
         #region IGuildChannel