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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // Pixel-based analytics. | ||
| // Generates user and session identifiers on client side. | ||
| // Shortcuts bots/crawlers/spiders. | ||
|
|
||
| (() => { | ||
| const platform = navigator.platform || ''; | ||
| if (platform.match(/bot|crawler|spider/i)) { | ||
| // Skips GoogleBot etc. | ||
| return; | ||
| } | ||
|
|
||
| // Helper to check whether the current visitor is the | ||
| // blog administrator. | ||
| const isAdmin = () => { | ||
| return document.cookie.match(/blog_core_admin\s*=\s*1/); | ||
| }; | ||
|
|
||
| // Don't run the remainder of the script for the admin. | ||
| if (isAdmin()) { | ||
| return; | ||
| } | ||
|
|
||
| // Helper to generate random identifiers. | ||
| const CHARACTERS = 'abcdefghijklmnopqrstuvwxyz0123456789'; | ||
| const generateId = () => { | ||
| let id = ''; | ||
| for (let i = 0; i < 32; i++) { | ||
| id += CHARACTERS.charAt(Math.floor(Math.random() * CHARACTERS.length)); | ||
| } | ||
| return id; | ||
| }; | ||
|
|
||
| // Reads the previous user id or generates a new one. | ||
| const getUserId = () => { | ||
| const match = document.cookie.match(/readers_user\s*=\s*([a-z0-9\-]+)/); | ||
| if (match) { | ||
| return match[1]; | ||
| } | ||
| const id = generateId(); | ||
| const expires = new Date(); | ||
| expires.setFullYear(expires.getFullYear() + 1); | ||
| document.cookie = 'readers_user=' + id + '; path=/; expires=' + expires.toUTCString(); | ||
| return id; | ||
| }; | ||
|
|
||
| // Reads the previous user id or generates a new one. | ||
| const getSessionId = () => { | ||
| const match = document.cookie.match(/readers_session\s*=\s*([a-z0-9\-]+)/); | ||
| if (match) { | ||
| return match[1]; | ||
| } | ||
| const id = generateId(); | ||
| document.cookie = 'readers_session=' + id + '; path=/'; | ||
| return id; | ||
| }; | ||
|
|
||
| // Injects the tracking pixel into the page body. | ||
| const injectPixel = () => { | ||
| const image = document.createElement('img'); | ||
| image.width = 1; | ||
| image.height = 1; | ||
| image.style.position = 'fixed'; | ||
| image.style.bottom = '0'; | ||
| image.style.right = '0'; | ||
| image.alt = 'Reader information sent to the backend'; | ||
| const params = { | ||
| u: getUserId(), | ||
| s: getSessionId(), | ||
| p: navigator.platform, | ||
| t: document.title, | ||
| e: window.bcEntryId || null, | ||
| r: document.referrer || null | ||
| }; | ||
| const query = Object.keys(params).map( | ||
| k => `${k}=${encodeURIComponent(params[k])}`).join('&'); | ||
| image.src = `/bc/reader.png?${query}`; | ||
| document.body.appendChild(image); | ||
| }; | ||
|
|
||
| injectPixel(); | ||
| })(); |
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