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python-blog/articles/static/vendor/goatcounter.js

233 lines
7.6 KiB
JavaScript

// GoatCounter: https://www.goatcounter.com
// This file (and *only* this file) is released under the ISC license:
// https://opensource.org/licenses/ISC
(function() {
'use strict';
if (window.goatcounter && window.goatcounter.vars) // Compatibility
window.goatcounter = window.goatcounter.vars
else
window.goatcounter = window.goatcounter || {}
// Get all data we're going to send off to the counter endpoint.
var get_data = function(vars) {
var data = {
p: (vars.path === undefined ? goatcounter.path : vars.path),
r: (vars.referrer === undefined ? goatcounter.referrer : vars.referrer),
t: (vars.title === undefined ? goatcounter.title : vars.title),
e: !!(vars.event || goatcounter.event),
s: [window.screen.width, window.screen.height, (window.devicePixelRatio || 1)],
b: is_bot(),
q: location.search,
}
var rcb, pcb, tcb // Save callbacks to apply later.
if (typeof(data.r) === 'function') rcb = data.r
if (typeof(data.t) === 'function') tcb = data.t
if (typeof(data.p) === 'function') pcb = data.p
if (is_empty(data.r)) data.r = document.referrer
if (is_empty(data.t)) data.t = document.title
if (is_empty(data.p)) data.p = get_path()
if (rcb) data.r = rcb(data.r)
if (tcb) data.t = tcb(data.t)
if (pcb) data.p = pcb(data.p)
return data
}
// Check if a value is "empty" for the purpose of get_data().
var is_empty = function(v) { return v === null || v === undefined || typeof(v) === 'function' }
// See if this looks like a bot; there is some additional filtering on the
// backend, but these properties can't be fetched from there.
var is_bot = function() {
// Headless browsers are probably a bot.
var w = window, d = document
if (w.callPhantom || w._phantom || w.phantom)
return 150
if (w.__nightmare)
return 151
if (d.__selenium_unwrapped || d.__webdriver_evaluate || d.__driver_evaluate)
return 152
if (navigator.webdriver)
return 153
return 0
}
// Object to urlencoded string, starting with a ?.
var urlencode = function(obj) {
var p = []
for (var k in obj)
if (obj[k] !== '' && obj[k] !== null && obj[k] !== undefined && obj[k] !== false)
p.push(encodeURIComponent(k) + '=' + encodeURIComponent(obj[k]))
return '?' + p.join('&')
}
// Show a warning in the console.
var warn = function(msg) {
if (console && 'warn' in console)
console.warn('goatcounter: ' + msg)
}
// Get the endpoint to send requests to.
var get_endpoint = function() {
var s = document.querySelector('script[data-goatcounter]');
if (s && s.dataset.goatcounter)
return s.dataset.goatcounter
return (goatcounter.endpoint || window.counter) // counter is for compat; don't use.
}
// Get current path.
var get_path = function() {
var loc = location,
c = document.querySelector('link[rel="canonical"][href]')
if (c) { // May be relative or point to different domain.
var a = document.createElement('a')
a.href = c.href
if (a.hostname.replace(/^www\./, '') === location.hostname.replace(/^www\./, ''))
loc = a
}
return (loc.pathname + loc.search) || '/'
}
// Filter some requests that we (probably) don't want to count.
goatcounter.filter = function() {
if ('visibilityState' in document && (document.visibilityState === 'prerender' || document.visibilityState === 'hidden'))
return 'visibilityState'
if (!goatcounter.allow_frame && location !== parent.location)
return 'frame'
if (!goatcounter.allow_local && location.hostname.match(/(localhost$|^127\.|^10\.|^172\.(1[6-9]|2[0-9]|3[0-1])\.|^192\.168\.)/))
return 'localhost'
if (!goatcounter.allow_local && location.protocol === 'file:')
return 'localfile'
if (localStorage && localStorage.getItem('skipgc') === 't')
return 'disabled with #toggle-goatcounter'
return false
}
// Get URL to send to GoatCounter.
window.goatcounter.url = function(vars) {
var data = get_data(vars || {})
if (data.p === null) // null from user callback.
return
data.rnd = Math.random().toString(36).substr(2, 5) // Browsers don't always listen to Cache-Control.
var endpoint = get_endpoint()
if (!endpoint)
return warn('no endpoint found')
return endpoint + urlencode(data)
}
// Count a hit.
window.goatcounter.count = function(vars) {
var f = goatcounter.filter()
if (f)
return warn('not counting because of: ' + f)
var url = goatcounter.url(vars)
if (!url)
return warn('not counting because path callback returned null')
var img = document.createElement('img')
img.src = url
img.style.position = 'absolute' // Affect layout less.
img.setAttribute('alt', '')
img.setAttribute('aria-hidden', 'true')
var rm = function() { if (img && img.parentNode) img.parentNode.removeChild(img) }
setTimeout(rm, 3000) // In case the onload isn't triggered.
img.addEventListener('load', rm, false)
document.body.appendChild(img)
}
// Get a query parameter.
window.goatcounter.get_query = function(name) {
var s = location.search.substr(1).split('&')
for (var i = 0; i < s.length; i++)
if (s[i].toLowerCase().indexOf(name.toLowerCase() + '=') === 0)
return s[i].substr(name.length + 1)
}
// Track click events.
window.goatcounter.bind_events = function() {
if (!document.querySelectorAll) // Just in case someone uses an ancient browser.
return
var send = function(elem) {
return function() {
goatcounter.count({
event: true,
path: (elem.dataset.goatcounterClick || elem.name || elem.id || ''),
title: (elem.dataset.goatcounterTitle || elem.title || (elem.innerHTML || '').substr(0, 200) || ''),
referrer: (elem.dataset.goatcounterReferrer || elem.dataset.goatcounterReferral || ''),
})
}
}
Array.prototype.slice.call(document.querySelectorAll("*[data-goatcounter-click]")).forEach(function(elem) {
if (elem.dataset.goatcounterBound)
return
var f = send(elem)
elem.addEventListener('click', f, false)
elem.addEventListener('auxclick', f, false) // Middle click.
elem.dataset.goatcounterBound = 'true'
})
}
// Add a "visitor counter" frame or image.
window.goatcounter.visit_count = function(opt) {
opt = opt || {}
opt.type = opt.type || 'html'
opt.append = opt.append || 'body'
opt.path = opt.path || get_path()
opt.attr = opt.attr || {width: '200', height: (opt.no_branding ? '60' : '80')}
opt.attr['src'] = get_endpoint() + 'er/' + encodeURIComponent(opt.path) + '.' + opt.type + '?'
if (opt.no_branding) opt.attr['src'] += '&no_branding=1'
if (opt.style) opt.attr['src'] += '&style=' + encodeURIComponent(opt.style)
var tag = {png: 'img', svg: 'img', html: 'iframe'}[opt.type]
if (!tag)
return warn('visit_count: unknown type: ' + opt.type)
if (opt.type === 'html') {
opt.attr['frameborder'] = '0'
opt.attr['scrolling'] = 'no'
}
var d = document.createElement(tag)
for (var k in opt.attr)
d.setAttribute(k, opt.attr[k])
var p = document.querySelector(opt.append)
if (!p)
return warn('visit_count: append not found: ' + opt.append)
p.appendChild(d)
}
// Make it easy to skip your own views.
if (location.hash === '#toggle-goatcounter')
if (localStorage.getItem('skipgc') === 't') {
localStorage.removeItem('skipgc', 't')
alert('GoatCounter tracking is now ENABLED in this browser.')
}
else {
localStorage.setItem('skipgc', 't')
alert('GoatCounter tracking is now DISABLED in this browser until ' + location + ' is loaded again.')
}
if (!goatcounter.no_onload) {
var go = function() {
goatcounter.count()
if (!goatcounter.no_events)
goatcounter.bind_events()
}
if (document.body === null)
document.addEventListener('DOMContentLoaded', function() { go() }, false)
else
go()
}
})();