add custom rule channel filtering

src/bot/modules/custom_rules/message_content_trigger.ts

@@ -11,6 +11,11 @@ async function messageContentTrigger(message: Message, trigger: CustomRuleTrigge
 
     let matched = false;
     if (trigger.matcher) {
+        if (trigger.channelFilter) {
+            if (trigger.channelFilter.mode == 'WHITELIST' && !trigger.channelFilter.channels.includes(message.channel_id)) return false;
+            if (trigger.channelFilter.mode == 'BLACKLIST' &&  trigger.channelFilter.channels.includes(message.channel_id)) return false;
+        }
+
         if (trigger.matcher instanceof RegExp) {
             /**
              * Since users will eventually be able to provide regexes, we need to protect

src/struct/antispam/CustomRuleTrigger.ts

@@ -10,6 +10,13 @@ class CustomRuleTrigger {
 
     userFilter?: 'user' | 'bot' | 'any';
 
+    channelFilter?: {
+        // Whitelist only triggers the rule in specified channels,
+        // Blacklist only triggers the rule in channels not specified
+        mode: 'WHITELIST'|'BLACKLIST',
+        channels: string[],
+    }
+
     // The minimum delay between rule matches. If omitted, rule matches every message
     timeout?: {
         perUser?: number;