overleaf/services/web/frontend/js/infrastructure/event-tracking.js

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import sessionStorage from '../infrastructure/session-storage'
const CACHE_KEY = 'mbEvents'
function alreadySent(key) {
const eventCache = sessionStorage.getItem(CACHE_KEY) || {}
return !!eventCache[key]
}
function markAsSent(key) {
const eventCache = sessionStorage.getItem(CACHE_KEY) || {}
eventCache[key] = true
sessionStorage.setItem(CACHE_KEY, eventCache)
}
export function send(category, action, label, value) {
if (typeof window.ga === 'function') {
window.ga('send', 'event', category, action, label, value)
}
}
export function sendOnce(category, action, label, value) {
if (alreadySent(category)) return
if (typeof window.ga !== 'function') return
window.ga('send', 'event', category, action, label, value)
markAsSent(category)
}
export function sendMB(key, segmentation = {}) {
sendBeacon(key, segmentation)
if (typeof window.gtag !== 'function') return
if (['paywall-click', 'paywall-prompt', 'plans-page-click'].includes(key)) {
window.gtag('event', key, segmentation)
}
}
export function sendMBOnce(key, segmentation = {}) {
if (alreadySent(key)) return
sendMB(key, segmentation)
markAsSent(key)
}
export function sendMBSampled(key, body = {}, rate = 0.01) {
if (Math.random() < rate) {
sendMB(key, body)
}
}
function sendBeacon(key, data) {
if (!navigator || !navigator.sendBeacon) return
data._csrf = window.csrfToken
const blob = new Blob([JSON.stringify(data)], {
type: 'application/json; charset=UTF-8',
})
try {
navigator.sendBeacon(`/event/${key}`, blob)
} catch (error) {
// Ignored. There's a range of browser for which `navigator.sendBeacon` is available but
// will throw an error if it's called with an unacceptable mime-typed Blob as the data.
}
}