kafka-pub-sub/validation/validateEvent.js

Enterprise-grade Kafka publish/subscribe library for Node.js — producer pool, batch sending, DLQ, SSL/SASL, multi-broker, and real-world industry examples.

const Joi = require('joi');

/**
 * Validates a Kafka message event (the key prefix).
 *
 * Rules:
 *  - Must be a non-empty string
 *  - 1–100 characters
 *
 * @param {string} event - The event name to validate.
 * @throws {Error} When the event is invalid.
 */
const validateEvent = (event) => {
  const schema = Joi.object()
    .keys({
      event: Joi.string().min(1).max(100).required().description('Kafka message event name'),
    })
    .unknown();

  const { error } = schema.prefs({ errors: { label: 'key' } }).validate({ event });

  if (error) {
    throw new Error('Invalid event: must be a non-empty string up to 100 characters');
  }
};

module.exports = validateEvent;