feat: respect guild boost file size limit when re-sending attachments

PluralKit.Bot/Proxy/ProxyService.cs

@@ -146,6 +146,7 @@ namespace PluralKit.Bot
             var messageChannel = _cache.GetChannel(trigger.ChannelId);
             var rootChannel = _cache.GetRootChannel(trigger.ChannelId);
             var threadId = messageChannel.IsThread() ? messageChannel.Id : (ulong?)null;
+            var guild = _cache.GetGuild(trigger.GuildId.Value);
 
             var proxyMessage = await _webhookExecutor.ExecuteWebhook(new ProxyRequest
             {
@@ -156,6 +157,7 @@ namespace PluralKit.Bot
                 AvatarUrl = AvatarUtils.TryRewriteCdnUrl(match.Member.ProxyAvatar(ctx)),
                 Content = content,
                 Attachments = trigger.Attachments,
+                FileSizeLimit = guild.FileSizeLimit(),
                 Embeds = embeds.ToArray(),
                 AllowEveryone = allowEveryone,
             });

PluralKit.Bot/Services/WebhookExecutorService.cs

@@ -40,6 +40,7 @@ namespace PluralKit.Bot
         public string? AvatarUrl { get; init; }
         public string? Content { get; init; }
         public Message.Attachment[] Attachments { get; init; }
+        public int FileSizeLimit { get; init; }
         public Embed[] Embeds { get; init; }
         public bool AllowEveryone { get; init; }
     }
@@ -122,7 +123,7 @@ namespace PluralKit.Bot
             };
 
             MultipartFile[] files = null;
-            var attachmentChunks = ChunkAttachmentsOrThrow(req.Attachments, 8 * 1024 * 1024);
+            var attachmentChunks = ChunkAttachmentsOrThrow(req.Attachments, req.FileSizeLimit * 1024 * 1024);
             if (attachmentChunks.Count > 0)
             {
                 _logger.Information("Invoking webhook with {AttachmentCount} attachments totalling {AttachmentSize} MiB in {AttachmentChunks} chunks",