New option for the moderation bot: forbid duplicate messages (#516).

server/lib/configuration/channel/storage.ts

@@ -50,6 +50,12 @@ function getDefaultChannelConfigurationOptions (_options: RegisterServerOptions)
         tolerance: 0,
         applyToModerators: false
       },
+      noDuplicate: {
+        enabled: false,
+        reason: '',
+        delay: 60,
+        applyToModerators: false
+      },
       quotes: [],
       commands: []
     },
@@ -124,6 +130,11 @@ function channelConfigurationOptionsToBotRoomConf (
     handlersIds.set(id, true)
     handlers.push(_getForbidSpecialCharsHandler(id, channelConfigurationOptions.bot.forbidSpecialChars))
   }
+  if (channelConfigurationOptions.bot.noDuplicate.enabled) {
+    const id = 'no_duplicate'
+    handlersIds.set(id, true)
+    handlers.push(_getNoDuplicateHandler(id, channelConfigurationOptions.bot.noDuplicate))
+  }
   channelConfigurationOptions.bot.quotes.forEach((v, i) => {
     const id = 'quote_' + i.toString()
     handlersIds.set(id, true)
@@ -254,6 +265,23 @@ function _getForbidSpecialCharsHandler (
   return handler
 }
 
+function _getNoDuplicateHandler (
+  id: string,
+  noDuplicate: ChannelConfigurationOptions['bot']['noDuplicate']
+): ConfigHandler {
+  const handler: ConfigHandler = {
+    type: 'no-duplicate',
+    id,
+    enabled: true,
+    options: {
+      reason: noDuplicate.reason,
+      delay: noDuplicate.delay,
+      applyToModerators: !!noDuplicate.applyToModerators
+    }
+  }
+  return handler
+}
+
 function _getQuotesHandler (
   id: string,
   quotes: ChannelConfigurationOptions['bot']['quotes'][0]