copyPasta.js

const saveMessage = (message) => {
  const existingMessage = messages[message];
  let occurrences = 1;

  if (existingMessage) {
    occurrences = existingMessage.occurrences + 1;
  }

  if (Date.now() - messages[message]?.last_update > copyPastaIntervalDetectionTime) {
    occurrences = 1;
  }

  messages[message] = {
    occurrences,
    last_update: occurrences < maxOccurrences ? Date.now() : messages[message].last_update
  }
}

const cleanupOldMessages = () => {
  messages = Object.fromEntries(Object.entries(messages)
    .filter(entry => {
      if (entry[1].occurrences < maxOccurrences) {
        return Date.now() - entry[1].last_update < copyPastaIntervalDetectionTime;
      } else {
        return Date.now() - entry[1].last_update < (copyPastaIntervalDetectionTime + copyPastaPrisonTime);
      }
    }))
}

function isCopyPasta(rawMessage) {
  const formattedMessage = rawMessage.trim();

  saveMessage(formattedMessage);

  cleanupOldMessages();

  return messages[formattedMessage] && messages[formattedMessage].occurrences >= maxOccurrences;
}