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privacyguides.org/layouts/_partials/custom/head-end.html
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2026-07-22 16:51:11 -05:00
<script>
(() => {
const redirectCache = new Map();
const forceNavigatePaths = new Set([]);
function normalizePathname(pathname) {
const normalized = pathname.replace(/\/+$/, '');
return normalized || '/';
}
function urlsReferToSamePage(firstUrl, secondUrl) {
const first = new URL(firstUrl, location.href);
const second = new URL(secondUrl, location.href);
return (
first.origin === second.origin &&
normalizePathname(first.pathname) ===
normalizePathname(second.pathname) &&
first.search === second.search
);
}
function getMetaRefreshDestination(documentCopy, sourceUrl) {
const refresh = documentCopy.querySelector(
'meta[http-equiv="refresh" i]'
);
if (!refresh) return null;
const content = refresh.getAttribute('content') || '';
const match = content.match(
/^\s*\d+(?:\.\d+)?\s*;\s*url\s*=\s*(.+?)\s*$/i
);
if (!match) return null;
const destination = match[1]
.trim()
.replace(/^(['"])(.*)\1$/, '$2');
try {
return new URL(destination, sourceUrl).href;
} catch {
return null;
}
}
async function redirectsToAnotherPage(href) {
const requestedUrl = new URL(href, location.href);
const cacheKey = requestedUrl.href;
if (redirectCache.has(cacheKey)) {
return redirectCache.get(cacheKey);
}
const checkPromise = (async () => {
try {
const response = await fetch(requestedUrl.href, {
method: 'GET',
redirect: 'follow',
credentials: 'same-origin',
cache: 'force-cache'
});
/*
* Detect ordinary HTTP redirects while ignoring redirects that
* only add or remove a trailing slash.
*/
if (
response.redirected &&
!urlsReferToSamePage(requestedUrl.href, response.url)
) {
return true;
}
/*
* Some static-site generators implement redirects using an HTML
* meta-refresh page rather than an HTTP redirect.
*/
const contentType =
response.headers.get('content-type') || '';
if (!contentType.includes('text/html')) {
return false;
}
const html = await response.text();
const documentCopy = new DOMParser().parseFromString(
html,
'text/html'
);
const destination = getMetaRefreshDestination(
documentCopy,
requestedUrl.href
);
return (
destination !== null &&
!urlsReferToSamePage(requestedUrl.href, destination)
);
} catch (error) {
console.warn(
`Could not check whether ${requestedUrl.href} redirects:`,
error
);
/*
* Preserve normal navigation when detection fails.
*/
return false;
}
})();
redirectCache.set(cacheKey, checkPromise);
return checkPromise;
}
document.addEventListener(
'click',
async (event) => {
if (!(event.target instanceof Element)) return;
/*
* Preserve middle-clicks and modifier-clicks so users can still
* open links in new tabs or windows.
*/
if (
event.button !== 0 ||
event.ctrlKey ||
event.metaKey ||
event.shiftKey ||
event.altKey
) {
return;
}
const link = event.target.closest(
'.hextra-sidebar-container a[href]'
);
if (!link) return;
const linkUrl = new URL(link.href, location.href);
/*
* Do not alter external links.
*/
if (linkUrl.origin !== location.origin) return;
const row = link.parentElement;
const toggleButton = row?.querySelector(
'.hextra-sidebar-collapsible-button'
);
/*
* Links without a collapsible arrow are ordinary page links.
*/
if (!toggleButton) return;
/*
* Explicitly allow known section pages to navigate normally.
*/
if (
forceNavigatePaths.has(
normalizePathname(linkUrl.pathname)
)
) {
return;
}
/*
* Temporarily prevent navigation while checking whether this is a
* redirect-only section link or a real page.
*/
event.preventDefault();
event.stopPropagation();
event.stopImmediatePropagation();
const isRedirect = await redirectsToAnotherPage(linkUrl.href);
if (isRedirect) {
/*
* Reuse Hextra's existing collapsible-sidebar behavior.
*/
toggleButton.click();
} else {
/*
* This section has its own page, so navigate to it normally.
*/
location.assign(linkUrl.href);
}
},
true
);
})();
</script>