45 lines
1.6 KiB
TypeScript
45 lines
1.6 KiB
TypeScript
/*
|
|
Due to Owncast's goal of being private by default, we don't want any external
|
|
links to leak the instance of Owncast as a referrer.
|
|
This observer attempts to catch any anchor tags and automatically add the
|
|
noopener and noreferrer attributes to them so the instance of Owncast isn't
|
|
passed along in the headers.
|
|
|
|
This should should be fired somewhere relatively high level in the DOM and live
|
|
for the entirety of the page.
|
|
*/
|
|
|
|
/* eslint-disable no-restricted-syntax */
|
|
export default function setupNoLinkReferrer(observationRoot: HTMLElement): void {
|
|
// Options for the observer (which mutations to observe)
|
|
const config = { attributes: false, childList: true, subtree: true };
|
|
|
|
const addNoReferrer = (node: Element): void => {
|
|
node.setAttribute('rel', 'noopener noreferrer ');
|
|
};
|
|
|
|
// Callback function to execute when mutations are observed
|
|
// eslint-disable-next-line func-names
|
|
const callback = function (mutationList) {
|
|
for (const mutation of mutationList) {
|
|
for (const node of mutation.addedNodes) {
|
|
// we track only elements, skip other nodes (e.g. text nodes)
|
|
// eslint-disable-next-line no-continue
|
|
if (!(node instanceof HTMLElement)) continue;
|
|
|
|
if (node.tagName.toLowerCase() === 'a') {
|
|
addNoReferrer(node);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
observationRoot.querySelectorAll('a').forEach(anchor => addNoReferrer(anchor));
|
|
|
|
// Create an observer instance linked to the callback function
|
|
const observer = new MutationObserver(callback);
|
|
|
|
// Start observing the target node for configured mutations
|
|
observer.observe(observationRoot, config);
|
|
}
|