Function isPDF

src/utils/url.ts:301–327

(url: string)

const wikiPDFPathRegexp = /^\/.*\/[a-z]+\:[^\:\/]+\.pdf/i;

export function isPDF(url: string): boolean {
    try {
        const {hostname, pathname} = new URL(url);
        if (pathname.includes('.pdf')) {
            if (
                ((hostname.endsWith('.wikimedia.org') || hostname.endsWith('.wikipedia.org')) && pathname.match(wikiPDFPathRegexp)) ||
                (hostname.endsWith('.dropbox.com') && pathname.startsWith('/s/') && (pathname.endsWith('.pdf') || pathname.endsWith('.PDF')))
            ) {
                return false;
            }
            if (pathname.endsWith('.pdf')) {
                for (let i = pathname.length; i >= 0; i--) {
                    if (pathname[i] === '=') {
                        return false;
                    } else if (pathname[i] === '/') {
                        return true;
                    }
                }
            } else {
                return false;
            }
        }
    } catch (e) {
        // Do nothing
    }
    return false;
}

const indexedSiteLists = new WeakMap<string[], URLTemplateIndex>();