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