https://wsoccernews.com/wp-content/plugins/sphere-post-views/assets/js/post-views.js?ver=1.0.2

1/**
2 * Sphere Post Views - log AJAX count.
3 * 
4 * @copyright 2022 ThemeSphere
5 */
6'use strict';
7
8(() => {
9	const STORAGE_KEY = 'sphere-post-views';
10	let configs;
11
12	function init(postID) {
13		configs = Sphere_PostViews;
14		postID  = postID || configs.postID || null;
15
16		if (!window.fetch || !configs || !postID) {
17			return;
18		}
19	
20		if (configs.sampling) {
21			const rand = Math.floor(Math.random() * configs.samplingRate) + 1;
22			if (rand !== 1)  {
23				return;
24			}
25		}
26
27		if (isCrawler()) {
28			return;
29		}
30
31		// Already counted.
32		if (recentlyCounted(postID)) {
33			return;
34		}
35
36		const params = {
37			method: 'POST',
38			headers: {
39				'Content-type': 'application/x-www-form-urlencoded'
40			},
41			body: [
42				'post_id=' + postID,
43				'action=update_views_ajax',
44				'token=' + configs.token
45			].join('&')
46		};
47
48		fetch(configs.ajaxUrl, params)
49			.then(resp => resp.text())
50			.then(data => logViewCount(postID));
51	}
52
53	/**
54	 * Check if post count was recently counted.
55	 */
56	function recentlyCounted(id) {
57		if (!configs.repeatCountDelay) {
58			return false;
59		}
60

61		// Seconds in Hours converted to ms.
62		const repeatCountDelay = 3600 * parseFloat(configs.repeatCountDelay) * 1000;
63		const viewed = getStorage() || {};
64
65		if (!viewed || !viewed.posts || (!id in viewed.posts)) {
66			return false;
67		}
68
69		const lastViewed = parseInt(viewed.posts[id]);
70		if ((Date.now() - lastViewed) < repeatCountDelay) {
71			return true;
72		}
73
74		return false;
75	}
76
77	/**
78	 * @returns {Boolean|Object}
79	 */
80	function getStorage() {
81		let viewed = localStorage.getItem(STORAGE_KEY);
82		if (!viewed) {
83			return false;
84		}
85
86		try {
87			viewed = JSON.parse(viewed);
88
89			// Grown too large.
90			if (viewed.posts && Object.keys(viewed.posts).length > 10000) {
91				viewed = {};
92			}
93
94		} catch(e) {
95			return false;
96		}
97
98		return viewed;
99	}
100
101	/**
102	 * Add a view count to storage, if needed.
103	 * 
104	 * @param {Number} id 
105	 */
106	function logViewCount(id) {
107		if (!configs.repeatCountDelay) {
108			return;
109		}
110
111		const viewed = getStorage() || {};
112		viewed.posts = viewed.posts || {};
113		viewed.posts[id] = Date.now();
114
115		localStorage.setItem(STORAGE_KEY, JSON.stringify(viewed));
116	}
117
118	/**
119	 * Minimal crawler detection of popular bots.
120	 */
121	function isCrawler() {
122		if (navigator.webdriver) {
123			return true;
124		}
125
126		const isBot = /headless|bot|spider|crawl|google|baidu|bing|msn|teoma|slurp|yandex/i.test(navigator.userAgent);
127		return isBot;
128	}
129
130	document.readyState !== 'loading' 
131		? init()
132		: document.addEventListener('DOMContentLoaded', () => init());
133
134	document.addEventListener('spc-alp-pageview', e => {
135		if (!e.detail.id) {
136			return;
137		}
138
139		init(e.detail.id);
140	});
141})();