throw NotSupportedException in News channel

throw a NotSupportedException whenever trying to use SlowModeInterval or anything related to overwrite permissions

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

@@ -30,7 +30,7 @@ namespace Discord.WebSocket
         public int Position { get; private set; }        
 
         /// <inheritdoc />
-        public IReadOnlyCollection<Overwrite> PermissionOverwrites => _overwrites;
+        public virtual IReadOnlyCollection<Overwrite> PermissionOverwrites => _overwrites;
         /// <summary>
         ///     Gets a collection of users that are able to view the channel.
         /// </summary>
@@ -87,7 +87,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     An overwrite object for the targeted user; <c>null</c> if none is set.
         /// </returns>
-        public OverwritePermissions? GetPermissionOverwrite(IUser user)
+        public virtual OverwritePermissions? GetPermissionOverwrite(IUser user)
         {
             for (int i = 0; i < _overwrites.Length; i++)
             {
@@ -103,7 +103,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     An overwrite object for the targeted role; <c>null</c> if none is set.
         /// </returns>
-        public OverwritePermissions? GetPermissionOverwrite(IRole role)
+        public virtual OverwritePermissions? GetPermissionOverwrite(IRole role)
         {
             for (int i = 0; i < _overwrites.Length; i++)
             {
@@ -122,7 +122,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     A task representing the asynchronous permission operation for adding the specified permissions to the channel.
         /// </returns>
-        public async Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
+        public virtual async Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
         {
             await ChannelHelper.AddPermissionOverwriteAsync(this, Discord, user, permissions, options).ConfigureAwait(false);
             _overwrites = _overwrites.Add(new Overwrite(user.Id, PermissionTarget.User, new OverwritePermissions(permissions.AllowValue, permissions.DenyValue)));
@@ -137,7 +137,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     A task representing the asynchronous permission operation for adding the specified permissions to the channel.
         /// </returns>
-        public async Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
+        public virtual async Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
         {
             await ChannelHelper.AddPermissionOverwriteAsync(this, Discord, role, permissions, options).ConfigureAwait(false);
             _overwrites = _overwrites.Add(new Overwrite(role.Id, PermissionTarget.Role, new OverwritePermissions(permissions.AllowValue, permissions.DenyValue)));
@@ -150,7 +150,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     A task representing the asynchronous operation for removing the specified permissions from the channel.
         /// </returns>
-        public async Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
+        public virtual async Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
         {
             await ChannelHelper.RemovePermissionOverwriteAsync(this, Discord, user, options).ConfigureAwait(false);
 
@@ -171,7 +171,7 @@ namespace Discord.WebSocket
         /// <returns>
         ///     A task representing the asynchronous operation for removing the specified permissions from the channel.
         /// </returns>
-        public async Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
+        public virtual async Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
         {
             await ChannelHelper.RemovePermissionOverwriteAsync(this, Discord, role, options).ConfigureAwait(false);
 

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

@@ -1,4 +1,7 @@
+using System;
+using System.Collections.Generic;
 using System.Diagnostics;
+using System.Threading.Tasks;
 using Model = Discord.API.Channel;
 
 namespace Discord.WebSocket
@@ -19,6 +22,31 @@ namespace Discord.WebSocket
             entity.Update(state, model);
             return entity;
         }
-        //TODO: Need to set custom channel properties for this type, as apparently it does not support slow mode or overwrites.
+        public override int SlowModeInterval
+        {
+            get { throw new NotSupportedException("News channels do not support Slow Mode."); }
+        }
+        public override Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override IReadOnlyCollection<Overwrite> PermissionOverwrites
+            => throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        public override Task SyncPermissionsAsync(RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
     }
 }

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

@@ -21,7 +21,7 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         public string Topic { get; private set; }
         /// <inheritdoc />
-        public int SlowModeInterval { get; private set; }
+        public virtual int SlowModeInterval { get; private set; }
         /// <inheritdoc />
         public ulong? CategoryId { get; private set; }
         /// <summary>
@@ -33,7 +33,7 @@ namespace Discord.WebSocket
         public ICategoryChannel Category
             => CategoryId.HasValue ? Guild.GetChannel(CategoryId.Value) as ICategoryChannel : null;
         /// <inheritdoc />
-        public Task SyncPermissionsAsync(RequestOptions options = null)
+        public virtual Task SyncPermissionsAsync(RequestOptions options = null)
             => ChannelHelper.SyncPermissionsAsync(this, Discord, options);
 
         private bool _nsfw;