Added .emojiadd command

src/NadekoBot/Common/TypeReaders/EmoteTypeReader.cs

@@ -0,0 +1,17 @@
+using System.Threading.Tasks;
+using Discord;
+using Discord.Commands;
+
+namespace NadekoBot.Common.TypeReaders
+{
+    public sealed class EmoteTypeReader : NadekoTypeReader<Emote>
+    {
+        public override Task<TypeReaderResult> ReadAsync(ICommandContext ctx, string input)
+        {
+            if (!Emote.TryParse(input, out var emote))
+                return Task.FromResult(TypeReaderResult.FromError(CommandError.ParseFailed, "Input is not a valid emote"));
+
+            return Task.FromResult(TypeReaderResult.FromSuccess(emote));
+        }
+    }
+}

src/NadekoBot/Modules/Utility/Utility.cs

@@ -9,6 +9,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Net.Http;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -25,15 +26,18 @@ namespace NadekoBot.Modules.Utility
         private readonly IStatsService _stats;
         private readonly IBotCredentials _creds;
         private readonly DownloadTracker _tracker;
+        private readonly IHttpClientFactory _httpFactory;
 
         public Utility(DiscordSocketClient client, ICoordinator coord,
-            IStatsService stats, IBotCredentials creds, DownloadTracker tracker)
+            IStatsService stats, IBotCredentials creds, DownloadTracker tracker,
+            IHttpClientFactory httpFactory)
         {
             _client = client;
             _coord = coord;
             _stats = stats;
             _creds = creds;
             _tracker = tracker;
+            _httpFactory = httpFactory;
         }
 
         [NadekoCommand, Aliases]
@@ -278,6 +282,52 @@ namespace NadekoBot.Modules.Utility
                 await ctx.Channel.SendMessageAsync(result.TrimTo(2000)).ConfigureAwait(false);
         }
 
+        [NadekoCommand, Aliases]
+        [RequireContext(ContextType.Guild)]
+        [RequireBotPermission(GuildPermission.ManageEmojis)]
+        [RequireUserPermission(GuildPermission.ManageEmojis)]
+        [Priority(0)]
+        public Task EmojiAdd(string name, Emote emote)
+            => EmojiAdd(name, emote.Url);
+        
+        [NadekoCommand, Aliases]
+        [RequireContext(ContextType.Guild)]
+        [RequireBotPermission(GuildPermission.ManageEmojis)]
+        [RequireUserPermission(GuildPermission.ManageEmojis)]
+        public Task EmojiAdd(Emote emote)
+            => EmojiAdd(emote.Name, emote.Url);
+        
+        [NadekoCommand, Aliases]
+        [RequireContext(ContextType.Guild)]
+        [RequireBotPermission(GuildPermission.ManageEmojis)]
+        [RequireUserPermission(GuildPermission.ManageEmojis)]
+        public async Task EmojiAdd(string name, string url)
+        {
+            name = name.Trim(':');
+            using var http = _httpFactory.CreateClient();
+            var res = await http.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
+            if (!res.IsImage() || res.GetImageSize() is null or > 262_144)
+            {
+                await ReplyErrorLocalizedAsync(strs.invalid_emoji_link);
+                return;
+            }
+
+            await using var imgStream = await res.Content.ReadAsStreamAsync();
+            Emote em;
+            try
+            {
+                em = await ctx.Guild.CreateEmoteAsync(name, new(imgStream));
+            }
+            catch (Exception ex)
+            {
+                Log.Warning(ex, "Error adding emoji on server {GuildId}", ctx.Guild.Id);
+
+                await ReplyErrorLocalizedAsync(strs.emoji_add_error);
+                return;
+            }
+            await ConfirmLocalizedAsync(strs.emoji_added(em.ToString()));
+        }
+
         [NadekoCommand, Aliases]
         [OwnerOnly]
         public async Task ListServers(int page = 1)

src/NadekoBot/data/aliases.yml

@@ -720,6 +720,9 @@ removeperm:
 showemojis:
 - showemojis
 - se
+emojiadd:
+- emojiadd
+- ea
 deckshuffle:
 - deckshuffle
 - dsh

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -1195,6 +1195,16 @@ showemojis:
   desc: "Shows a name and a link to every SPECIAL emoji in the message."
   args:
     - "A message full of SPECIAL emojis"
+emojiadd:
+  desc: |-
+    Adds the specified emoji to this server.
+    You can specify a name before the emoji to add it under a different name.
+    You can specify a name followed by an image link to add a new emoji from an image.
+    Image size has to be below 256KB.
+  args:
+    - ":someonesCustomEmoji:"
+    - "MyEmojiName :someonesCustomEmoji:"
+    - "owoNice https://cdn.discordapp.com/emojis/587930873811173386.png?size=128"
 deckshuffle:
   desc: "Reshuffles all cards back into the deck."
   args:

src/NadekoBot/data/strings/responses/responses.en-US.json

@@ -9,6 +9,9 @@
   "crr_reset": "Custom reaction with id {0} will no longer add reactions.",
   "crr_set": "Custom reaction with id {0} will add following reactions to the response message: {1}",
   "invalid_emojis": "All emojis you've specified are invalid.",
+  "invalid_emoji_link": "Specified link is either not an image or exceeds 256KB.",
+  "emoji_add_error": "Error adding emoji. You either ran out of emoji slots, or image size is inadequate.",
+  "emoji_added": "Added a new emoji: {0}",
   "fw_cleared": "Removed all filtered words and filtered words channel settings.",
   "aliases_cleared": "All {0} aliases on this server have been removed.",
   "no_results": "No results found.",