DSNConfigurator

31class DSNConfigurator32{33    /**34     * Create new PHPMailer instance configured by DSN.35     *36     * @param string $dsn        DSN37     * @param bool   $exceptions Should we throw external exceptions?38     *39     * @return PHPMailer40     */41    public static function mailer($dsn, $exceptions = null)42    {43        static $configurator = null;44 45        if (null === $configurator) {46            $configurator = new DSNConfigurator();47        }48 49        return $configurator->configure(new PHPMailer($exceptions), $dsn);50    }51 52    /**53     * Configure PHPMailer instance with DSN string.54     *55     * @param PHPMailer $mailer PHPMailer instance56     * @param string    $dsn    DSN57     *58     * @return PHPMailer59     */60    public function configure(PHPMailer $mailer, $dsn)61    {62        $config = $this->parseDSN($dsn);63 64        $this->applyConfig($mailer, $config);65 66        return $mailer;67    }68 69    /**70     * Parse DSN string.71     *72     * @param string $dsn DSN73     *74     * @throws Exception If DSN is malformed75     *76     * @return array Configuration77     */78    private function parseDSN($dsn)79    {80        $config = $this->parseUrl($dsn);81 82        if (false === $config || !isset($config['scheme']) || !isset($config['host'])) {83            throw new Exception('Malformed DSN');84        }85 86        if (isset($config['query'])) {87            parse_str($config['query'], $config['query']);88        }89 90        return $config;91    }92 93    /**94     * Apply configuration to mailer.95     *96     * @param PHPMailer $mailer PHPMailer instance97     * @param array     $config Configuration98     *99     * @throws Exception If scheme is invalid100     */101    private function applyConfig(PHPMailer $mailer, $config)102    {103        switch ($config['scheme']) {104            case 'mail':105                $mailer->isMail();106                break;107            case 'sendmail':108                $mailer->isSendmail();109                break;110            case 'qmail':