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