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Viewing file:     domain.js (3.15 KB)      -rw-r--r--

/**
 * Check if `vhost` is a valid suffix of `hostname` (top-domain)
 *
 * It means that `vhost` needs to be a suffix of `hostname` and we then need to
 * make sure that: either they are equal, or the character preceding `vhost` in
 * `hostname` is a '.' (it should not be a partial label).
 *
 * * hostname = 'not.evil.com' and vhost = 'vil.com'      => not ok
 * * hostname = 'not.evil.com' and vhost = 'evil.com'     => ok
 * * hostname = 'not.evil.com' and vhost = 'not.evil.com' => ok
 */
function shareSameDomainSuffix(hostname, vhost) {
    if (hostname.endsWith(vhost)) {
        return (hostname.length === vhost.length ||
            hostname[hostname.length - vhost.length - 1] === '.');
    }
    return false;
}
/**
 * Given a hostname and its public suffix, extract the general domain.
 */
function extractDomainWithSuffix(hostname, publicSuffix) {
    // Locate the index of the last '.' in the part of the `hostname` preceding
    // the public suffix.
    //
    // examples:
    //   1. not.evil.co.uk  => evil.co.uk
    //         ^    ^
    //         |    | start of public suffix
    //         | index of the last dot
    //
    //   2. example.co.uk   => example.co.uk
    //     ^       ^
    //     |       | start of public suffix
    //     |
    //     | (-1) no dot found before the public suffix
    const publicSuffixIndex = hostname.length - publicSuffix.length - 2;
    const lastDotBeforeSuffixIndex = hostname.lastIndexOf('.', publicSuffixIndex);
    // No '.' found, then `hostname` is the general domain (no sub-domain)
    if (lastDotBeforeSuffixIndex === -1) {
        return hostname;
    }
    // Extract the part between the last '.'
    return hostname.slice(lastDotBeforeSuffixIndex + 1);
}
/**
 * Detects the domain based on rules and upon and a host string
 */
export default function getDomain(suffix, hostname, options) {
    // Check if `hostname` ends with a member of `validHosts`.
    if (options.validHosts !== null) {
        const validHosts = options.validHosts;
        for (const vhost of validHosts) {
            if ( /*@__INLINE__*/shareSameDomainSuffix(hostname, vhost)) {
                return vhost;
            }
        }
    }
    let numberOfLeadingDots = 0;
    if (hostname.startsWith('.')) {
        while (numberOfLeadingDots < hostname.length &&
            hostname[numberOfLeadingDots] === '.') {
            numberOfLeadingDots += 1;
        }
    }
    // If `hostname` is a valid public suffix, then there is no domain to return.
    // Since we already know that `getPublicSuffix` returns a suffix of `hostname`
    // there is no need to perform a string comparison and we only compare the
    // size.
    if (suffix.length === hostname.length - numberOfLeadingDots) {
        return null;
    }
    // To extract the general domain, we start by identifying the public suffix
    // (if any), then consider the domain to be the public suffix with one added
    // level of depth. (e.g.: if hostname is `not.evil.co.uk` and public suffix:
    // `co.uk`, then we take one more level: `evil`, giving the final result:
    // `evil.co.uk`).
    return /*@__INLINE__*/ extractDomainWithSuffix(hostname, suffix);
}
//# sourceMappingURL=domain.js.map