mirror of https://github.com/torappinfo/uweb.git
80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
/**
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* Remove all the IFRAMEs that are off-site or do not have a “src” attribute.
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* These are typically used for ads and unwanted external content.
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* navigation etc.
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*
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* IFRAMEs without a “src” attribute are also used for sandboxing untrusted
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* content, e.g. on mailinator.com, but I have not yet found a way to
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* distinguish between src-less IFRAMEs for ads and src-less IFRAMEs for
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* “regular” content. Maybe try to guess based on the dimensions? Meh.
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*
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* @title rm IFRAMEs
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*/
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(function rmi() {
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/* Create a new IFRAME to get a "clean" Window object, so we can use its
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* console. Sometimes sites (e.g. Twitter) override console.log and even
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* the entire console object. "delete console.log" or "delete console"
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* does not always work, and messing with the prototype seemed more
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* brittle than this. */
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let console = (function () {
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let iframe = document.getElementById('xxxJanConsole');
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if (!iframe) {
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iframe = document.createElementNS('http://www.w3.org/1999/xhtml', 'iframe');
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iframe.id = 'xxxJanConsole';
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iframe.style.display = 'none';
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(document.body || document.documentElement).appendChild(iframe);
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}
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return iframe && iframe.contentWindow && iframe.contentWindow.console || {
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log: function () {}
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};
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})();
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/* Keep track of the HTMLDocument instances we have processed. */
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let processed = new Set();
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/**
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* Is the given node empty-ish? I.e., does it lack child elements and
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* non-whitespace text?
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*/
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function isEmpty(node) {
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return !node || (!node.childElementCount && (typeof node.textContent !== 'string' || node.textContent.trim() === ''));
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}
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/* The main function. */
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(function execute(document) {
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if (!document || typeof document.querySelectorAll !== 'function' || processed.has(document)) {
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return;
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}
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processed.add(document);
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/* Process all IFRAMEs. */
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Array.from(document.querySelectorAll('iframe:not(#xxxJanConsole)')).forEach(iframe => {
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let shouldDelete = false;
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try {
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shouldDelete = iframe.contentDocument === null || iframe.src === '';
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} catch (e) {
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shouldDelete = true;
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}
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if (shouldDelete) {
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console.log('rm IFRAMEs: found suspicious IFRAME to delete: ', iframe);
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let parentNode = iframe.parentNode;
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iframe.remove();
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while (parentNode && isEmpty(parentNode)) {
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console.log('rm IFRAMEs: found empty parent node to delete: ', parentNode);
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let oldParentNode = parentNode;
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parentNode = parentNode.parentNode;
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oldParentNode.remove();
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}
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} else {
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console.log('rm IFRAMEs: found non-suspicious IFRAME to recurse into: ', iframe);
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execute(iframe.contentDocument);
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}
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});
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})(document);
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})();
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