/**
* Helper functions for blocking scripts in pages, based off NoScript's lib/DocumentFreezer.js
*
* Copyright (C) 2005-2021 Giorgio Maone - https://maone.net
* Copyright (C) 2021 jahoti
* Redistribution terms are gathered in the `copyright' file.
*/
const loaderAttributes = ["href", "src", "data"];
const jsOrDataUrlRx = /^(?:data:(?:[^,;]*ml|unknown-content-type)|javascript:)/i;
function sanitize_attributes(element) {
if (element._frozen)
return;
let fa = [];
let loaders = [];
let attributes = element.attributes || [];
for (let a of attributes) {
let name = a.localName.toLowerCase();
if (loaderAttributes.includes(name))
if (jsOrDataUrlRx.test(a.value))
loaders.push(a);
else if (name.startsWith("on")) {
console.debug("Removing", a, element.outerHTML);
fa.push(a.cloneNode());
a.value = "";
element[name] = null;
}
}
if (loaders.length) {
for (let a of loaders) {
fa.push(a.cloneNode());
a.value = "javascript://frozen";
}
if ("contentWindow" in element)
element.replaceWith(element = element.cloneNode(true));
}
if (fa.length)
element._frozenAttributes = fa;
element._frozen = true;
}
function script_suppressor(nonce) {
const blockExecute = e => {
if (document.readyState === 'complete') {
removeEventListener('beforescriptexecute', blockExecute, true);
return;
}
else if (e.isTrusted && e.target.getAttribute('nonce') !== nonce) { // Prevent blocking of injected scripts
e.preventDefault();
console.log('Suppressed script', e.target);
}
};
return blockExecute;
};
/*
* EXPORTS_START
* EXPORT script_suppressor
* EXPORT sanitize_attributes
* EXPORTS_END
*/
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