This code initializes and loads Google's reCAPTCHA script into a...

April 7, 2025 at 04:36 PM

/* PLEASE DO NOT COPY AND PASTE THIS CODE. */(function(){var w=window,C='___grecaptcha_cfg',cfg=w[C]=w[C]||{},N='grecaptcha';var gr=w[N]=w[N]||{};gr.ready=gr.ready||function(f){(cfg['fns']=cfg['fns']||[]).push(f);};w['__recaptcha_api']='https://www.google.com/recaptcha/api2/';(cfg['render']=cfg['render']||[]).push('onload');(cfg['clr']=cfg['clr']||[]).push('true');w['__google_recaptcha_client']=true;var d=document,po=d.createElement('script');po.type='text/javascript';po.async=true; po.charset='utf-8';var s='https://www.gstatic.com/recaptcha/releases/hbAq-YhJxOnlU-7cpgBoAJHb/recaptcha__en.js',tt=w.trustedTypes,cp=tt&&tt.createPolicy,cp=cp&&cp.bind(tt); po.src=cp?cp('recaptcha', {createScriptURL:function(_){return s;}}).createScriptURL(''):s;po.crossOrigin='anonymous';po.integrity='sha384-0uUcqAX/lKvnfFMvCM7U5wcjfgBvv/1q+xxZKV6ZhBH4ikGcgTDEC4vEZPTt3l8O';var e=d.querySelector('script[nonce]'),n=e&&(e['nonce']||e.getAttribute('nonce'));if(n){po.setAttribute('nonce',n);}var s=d.getElementsByTagName('script')[0];s.parentNode.insertBefore(po, s);})();

This code initializes and loads Google's reCAPTCHA script into a web page. Here’s a breakdown of what the code does:

  1. Self-Executing Anonymous Function:

    • The code is wrapped in an Immediately Invoked Function Expression (IIFE), which means it runs automatically when the script is executed. It allows isolation of variables, so they do not conflict with other scripts on the page.

  2. Configuration Setup:

    • It initializes or updates the ___grecaptcha_cfg object in the window namespace. This object acts as a configuration storage for reCAPTCHA.
    • It provides functions for handling reCAPTCHA initialization (grecaptcha) and queues callback functions (like grecaptcha.ready()).

  3. Script Loading:

    • The code defines the reCAPTCHA API URL: https://www.gstatic.com/recaptcha/releases/....
    • A <script> element is dynamically created to load the external reCAPTCHA script (recaptcha__en.js).
    • Trusted Types and Content Security Policy (CSP) integration are handled:
      • If a trustedTypes policy is available, it ensures the URL used for the script is safely processed.
    • A Subresource Integrity (SRI) hash (sha384) is attached to ensure script integrity and prevent tampered scripts from being executed.

  4. Nonce and CSP Compliance:

    • The code checks for a nonce value in any existing script tag for Content Security Policy compliance.
    • If a nonce is present, it attaches the same nonce to the dynamically created script element.

  5. Script Insertion:

    • The newly created script element is inserted into the <head> or <body> of the document, loading the reCAPTCHA library asynchronously.

  6. Purpose:

    • This code is part of Google reCAPTCHA’s setup process. It loads the necessary JavaScript to enable reCAPTCHA's functionality (like spam protection, bot detection, etc.) on the web page.
    • Any registered grecaptcha.ready() callbacks are executed once the reCAPTCHA script is fully loaded.

In summary, this code integrates reCAPTCHA into a web page by loading the appropriate external library and initializing its configuration while supporting CSP and integrity verification.

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