src/Composer/Repository/Vcs/GitHubDriver.php
public static function supports(IOInterface $io, Config $config, $url, $deep = false)
    {
        if (!preg_match('#^((?:https?|git)://([^/]+)/|git@([^:]+):)([^/]+)/(.+?)(?:\.git|/)?$#', $url, $matches)) {
            return false;
        }

        $originUrl = !empty($matches[2]) ? $matches[2] : $matches[3];
        if (!in_array(preg_replace('{^www\.}i', '', $originUrl), $config->get('github-domains'))) {
            return false;
        }

        if (!extension_loaded('openssl')) {
            $io->writeError('Skipping GitHub driver for '.$url.' because the OpenSSL PHP extension is missing.', true, IOInterface::VERBOSE);

            return false;
        }

        return true;
    }
public static function supports(IOInterface $io, Config $config, $url, $deep = false)
    {
        if (!preg_match('#^((?:https?|git)://([^/]+)/|git@([^:]+):)([^/]+)/(.+?)(?:\.git|/)?$#', $url, $matches)) {
            return false;
        }

        $originUrl = !empty($matches[2]) ? $matches[2] : $matches[3];
        if (!in_array(preg_replace('{^www\.}i', '', $originUrl), $config->get('github-domains'))) {
            return false;
        }

        if (!extension_loaded('openssl')) {
            $io->writeError('Skipping GitHub driver for '.$url.' because the OpenSSL PHP extension is missing.', true, IOInterface::VERBOSE);

            return false;
        }

        return true;
    }
{@inheritDoc}