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"use strict"; |
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module.exports = create; |
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const cookie = require('cookie'); |
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const queryString = require('query-string'); |
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const merge = require('merge-objects'); |
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function create(document, settings) { |
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settings = merge(settings || {}, { |
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sources: [ |
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{referrer: 'google'}, |
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{referrer: 'yahoo'}, |
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{referrer: 'bing'}, |
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{queryParameter: 'gclid', 'value': 'adwords'}, |
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{queryParameter: 'msclkid', 'value': 'bingads'}, |
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{queryParameter: 'utm_source'} |
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], |
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cookie: { |
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name: 'last_click', |
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expires: 30 * 24 * 60 * 60 // 30 days in seconds |
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} |
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}); |
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const location = document.location; |
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const obj = { |
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getLastClick: getLastClick, |
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check: check |
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}; |
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obj.check(); |
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return obj; |
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/** |
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* @param {String} value |
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*/ |
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function save(value) { |
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const date = new Date(); |
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date.setTime(date.getTime() + (settings.cookie.expires * 1000)); |
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document.cookie = cookie.serialize(settings.cookie.name, value, { |
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httpOnly: true, |
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maxAge: settings.cookie.expires, |
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expires: date, |
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path: '/' |
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}); |
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} |
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/** |
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* @return {String|*} |
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*/ |
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function getLastClick() { |
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const cookies = cookie.parse(document.cookie); |
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if(hasProperty(cookies, settings.cookie.name)) { |
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return cookies[settings.cookie.name]; |
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} |
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return null; |
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} |
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function check() { |
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const queryParams = queryString.parse(location.search); |
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settings.sources.forEach(function (source) { |
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let val = ''; |
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if(hasProperty(source, 'queryParameter') && hasProperty(queryParams, source.queryParameter)) { |
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val = queryParams[source.queryParameter]; |
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} else if(hasProperty(source, 'referrer') && document.referrer && document.referrer.indexOf(source.referrer) >= 0) { |
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val = document.referrer; |
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} |
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if(val) { |
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if(hasProperty(source, 'value')) { |
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if(typeof(source.value) === 'function') { |
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val = source.value.apply(val); |
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} else { |
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val = source.value; |
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} |
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} |
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save(val); |
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} |
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}); |
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} |
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/** |
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* @param {Object} obj |
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* @param {String} property |
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* @return {boolean} |
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*/ |
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function hasProperty(obj, property) { |
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return Object.keys(obj).indexOf(property) !== -1 |
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} |
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} |
loevgaard /
last-click
