validations.ts•1.2 kB
/**
* Validate a topic to see if it's valid or not.
* A topic is valid if it follow below rules:
* - Rule #1: If any part of the topic is not `+` or `#`, then it must not contain `+` and '#'
* - Rule #2: Part `#` must be located at the end of the mailbox
*
* @param {String} topic - A topic
* @returns {Boolean} If the topic is valid, returns true. Otherwise, returns false.
*/
export function validateTopic(topic: string): boolean {
const parts = topic.split('/')
for (let i = 0; i < parts.length; i++) {
if (parts[i] === '+') {
continue
}
if (parts[i] === '#') {
// for Rule #2
return i === parts.length - 1
}
if (parts[i].indexOf('+') !== -1 || parts[i].indexOf('#') !== -1) {
return false
}
}
return true
}
/**
* Validate an array of topics to see if any of them is valid or not
* @param {Array} topics - Array of topics
* @returns {String} If the topics is valid, returns null. Otherwise, returns the invalid one
*/
export function validateTopics(topics: string[]): string {
if (topics.length === 0) {
return 'empty_topic_list'
}
for (let i = 0; i < topics.length; i++) {
if (!validateTopic(topics[i])) {
return topics[i]
}
}
return null
}