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/** Normalize URL to its canonical form */
export function createCanonicalURL(url: string, base?: string): URL {
let pathname = url.replace(/\/index.html$/, ''); // index.html is not canonical
pathname = pathname.replace(/\/1\/?$/, ''); // neither is a trailing /1/ (impl. detail of collections)
if (!getUrlExtension(url)) pathname = pathname.replace(/(\/+)?$/, '/'); // add trailing slash if there’s no extension
pathname = pathname.replace(/\/+/g, '/'); // remove duplicate slashes (URL() won’t)
return new URL(pathname, base);
}
/** Check if a URL is already valid */
export function isValidURL(url: string): boolean {
try {
new URL(url);
return true;
} catch (e) {}
return false;
}
function getUrlExtension(url: string) {
const lastDot = url.lastIndexOf('.');
const lastSlash = url.lastIndexOf('/');
return lastDot > lastSlash ? url.slice(lastDot + 1) : '';
}
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