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/* globals findInAllFrames:false, observeMutations:false */
// Adapted from https://github.com/mgziminsky/FacebookTrackingRemoval
// this should only run on facebook.com, messenger.com, and
// facebookcorewwwi.onion
let fb_wrapped_link = `a[href*='${document.domain.split(".").slice(-2).join(".")}/l.php?']:not([aria-label])`;
// remove all attributes from a link except for class and ARIA attributes
function cleanAttrs(elem) {
for (let i = elem.attributes.length - 1; i >= 0; --i) {
const attr = elem.attributes[i];
if (attr.name !== 'class' && !attr.name.startsWith('aria-')) {
elem.removeAttribute(attr.name);
}
}
}
// Remove excessive attributes and event listeners from link a and replace
// its destination with href
function cleanLink(a) {
let href = new URL(a.href).searchParams.get('u');
// If we can't extract a good URL, abort without breaking the links
if (!window.isURL(href)) {
return;
}
let href_url = new URL(href);
href_url.searchParams.delete('fbclid');
href = href_url.toString();
cleanAttrs(a);
a.href = href;
a.rel = "noreferrer";
a.target = "_blank";
a.addEventListener("click", function (e) { e.stopImmediatePropagation(); }, true);
a.addEventListener("mousedown", function (e) { e.stopImmediatePropagation(); }, true);
a.addEventListener("mouseup", function (e) { e.stopImmediatePropagation(); }, true);
a.addEventListener("mouseover", function (e) { e.stopImmediatePropagation(); }, true);
}
// TODO race condition; fix waiting on https://crbug.com/478183
chrome.runtime.sendMessage({
type: "checkEnabled"
}, function (enabled) {
if (!enabled) {
return;
}
// unwrap wrapped links in the original page
findInAllFrames(fb_wrapped_link).forEach((link) => {
cleanLink(link);
});
// Execute redirect unwrapping each time new content is added to the page
observeMutations(fb_wrapped_link, cleanLink);
});
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