feature: Add methods to interact with reactions without a message object (#1828)

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -108,6 +108,14 @@ namespace Discord.Rest
         public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
             => ClientHelper.GetWebhookAsync(this, id, options);
 
+        public Task AddReactionAsync(ulong channelId, ulong messageId, IEmote emote, RequestOptions options = null)
+            => MessageHelper.AddReactionAsync(channelId, messageId, emote, this, options);
+        public Task RemoveReactionAsync(ulong channelId, ulong messageId, ulong userId, IEmote emote, RequestOptions options = null)
+            => MessageHelper.RemoveReactionAsync(channelId, messageId, userId, emote, this, options);
+        public Task RemoveAllReactionsAsync(ulong channelId, ulong messageId, RequestOptions options = null)
+            => MessageHelper.RemoveAllReactionsAsync(channelId, messageId, this, options);
+        public Task RemoveAllReactionsForEmoteAsync(ulong channelId, ulong messageId, IEmote emote, RequestOptions options = null)
+            => MessageHelper.RemoveAllReactionsForEmoteAsync(channelId, messageId, emote, this, options);
         //IDiscordClient
         /// <inheritdoc />
         async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)

src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs

@@ -89,21 +89,41 @@ namespace Discord.Rest
             await client.ApiClient.SuppressEmbedAsync(msg.Channel.Id, msg.Id, apiArgs, options).ConfigureAwait(false);
         }
 
+        public static async Task AddReactionAsync(ulong channelId, ulong messageId, IEmote emote, BaseDiscordClient client, RequestOptions options)
+        {
+            await client.ApiClient.AddReactionAsync(channelId, messageId, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);
+        }
+
         public static async Task AddReactionAsync(IMessage msg, IEmote emote, BaseDiscordClient client, RequestOptions options)
         {
             await client.ApiClient.AddReactionAsync(msg.Channel.Id, msg.Id, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);
         }
 
+        public static async Task RemoveReactionAsync(ulong channelId, ulong messageId, ulong userId, IEmote emote, BaseDiscordClient client, RequestOptions options)
+        {
+            await client.ApiClient.RemoveReactionAsync(channelId, messageId, userId, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);
+        }
+
         public static async Task RemoveReactionAsync(IMessage msg, ulong userId, IEmote emote, BaseDiscordClient client, RequestOptions options)
         {
             await client.ApiClient.RemoveReactionAsync(msg.Channel.Id, msg.Id, userId, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);
         }
 
+        public static async Task RemoveAllReactionsAsync(ulong channelId, ulong messageId, BaseDiscordClient client, RequestOptions options)
+        {
+            await client.ApiClient.RemoveAllReactionsAsync(channelId, messageId, options).ConfigureAwait(false);
+        }
+
         public static async Task RemoveAllReactionsAsync(IMessage msg, BaseDiscordClient client, RequestOptions options)
         {
             await client.ApiClient.RemoveAllReactionsAsync(msg.Channel.Id, msg.Id, options).ConfigureAwait(false);
         }
 
+        public static async Task RemoveAllReactionsForEmoteAsync(ulong channelId, ulong messageId, IEmote emote, BaseDiscordClient client, RequestOptions options)
+        {
+            await client.ApiClient.RemoveAllReactionsForEmoteAsync(channelId, messageId, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);
+        }
+
         public static async Task RemoveAllReactionsForEmoteAsync(IMessage msg, IEmote emote, BaseDiscordClient client, RequestOptions options)
         {
             await client.ApiClient.RemoveAllReactionsForEmoteAsync(msg.Channel.Id, msg.Id, emote is Emote e ? $"{e.Name}:{e.Id}" : UrlEncode(emote.Name), options).ConfigureAwait(false);