fix(bot): fix utility admin command

PluralKit.Bot/CommandMeta/CommandTree.cs

@@ -181,6 +181,8 @@ public partial class CommandTree
             await ctx.Execute<Admin>(Admin, a => a.SystemRecover(ctx));
         else if (ctx.Match("sd", "systemdelete"))
             await ctx.Execute<Admin>(Admin, a => a.SystemDelete(ctx));
+        else if (ctx.Match("sendmsg", "sendmessage"))
+            await ctx.Execute<Admin>(Admin, a => a.SendAdminMessage(ctx));
         else if (ctx.Match("al", "abuselog"))
             await HandleAdminAbuseLogCommand(ctx);
         else

PluralKit.Bot/Commands/Admin.cs

@@ -9,6 +9,8 @@ using Myriad.Extensions;
 using Myriad.Cache;
 using Myriad.Rest;
 using Myriad.Types;
+using Myriad.Rest.Types.Requests;
+using Myriad.Rest.Exceptions;
 
 using PluralKit.Core;
 
@@ -19,12 +21,14 @@ public class Admin
     private readonly BotConfig _botConfig;
     private readonly DiscordApiClient _rest;
     private readonly IDiscordCache _cache;
+    private readonly PrivateChannelService _dmCache;
 
-    public Admin(BotConfig botConfig, DiscordApiClient rest, IDiscordCache cache)
+    public Admin(BotConfig botConfig, DiscordApiClient rest, IDiscordCache cache, PrivateChannelService dmCache)
     {
         _botConfig = botConfig;
         _rest = rest;
         _cache = cache;
+        _dmCache = dmCache;
     }
 
     private Task<(ulong Id, User? User)[]> GetUsers(IEnumerable<ulong> ids)
@@ -496,4 +500,34 @@ public class Admin
         await ctx.Repository.DeleteAbuseLog(abuseLog.Id);
         await ctx.Reply($"{Emojis.Success} Successfully deleted abuse log entry.");
     }
+
+    public async Task SendAdminMessage(Context ctx)
+    {
+        ctx.AssertBotAdmin();
+
+        var account = await ctx.MatchUser();
+        if (account == null)
+            throw new PKError("You must pass an account to send an admin message to (either ID or @mention).");
+        if (!ctx.HasNext())
+            throw new PKError("You must provide a message to send.");
+
+        var content = ctx.RemainderOrNull(false).NormalizeLineEndSpacing();
+        var messageContent = $"## [Admin Message]\n\n{content}\n\nWe cannot read replies sent to this DM. If you wish to contact the staff team, please join the support server (<https://discord.gg/PczBt78>) or send us an email at <legal@pluralkit.me>.";
+
+        try
+        {
+            var dm = await _dmCache.GetOrCreateDmChannel(account.Id);
+            var msg = await ctx.Rest.CreateMessage(dm,
+                new MessageRequest { Content = messageContent }
+            );
+        }
+        catch (ForbiddenException)
+        {
+            await ctx.Reply(
+                $"{Emojis.Error} Error while sending DM.");
+            return;
+        }
+
+        await ctx.Reply($"{Emojis.Success} Successfully sent message.");
+    }
 }