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/**
 * PHPMailer - PHP email creation and transport class.
 * PHP Version 5.5.
 *
 * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
 *
 * @author    Marcus Bointon (Synchro/coolbru) &lt;phpmailer@synchromedia.co.uk&gt;
 * @author    Jim Jagielski (jimjag) &lt;jimjag@gmail.com&gt;
 * @author    Andy Prevost (codeworxtech) &lt;codeworxtech@users.sourceforge.net&gt;
 * @author    Brent R. Matzelle (original founder)
 * @copyright 2012 - 2023 Marcus Bointon
 * @copyright 2010 - 2012 Jim Jagielski
 * @copyright 2004 - 2009 Andy Prevost
 * @license   https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License
 * @note      This program is distributed in the hope that it will be useful - WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 */

namespace PHPMailer\PHPMailer;

/**
 * Configure PHPMailer with DSN string.
 *
 * @see https://en.wikipedia.org/wiki/Data_source_name
 *
 * @author Oleg Voronkovich &lt;oleg-voronkovich@yandex.ru&gt;
 */
class DSNConfigurator
{
    /**
     * Create new PHPMailer instance configured by DSN.
     *
     * @param string $dsn        DSN
     * @param bool   $exceptions Should we throw external exceptions?
     *
     * @return PHPMailer
     */
    public static function mailer($dsn, $exceptions = null)
    {
        static $configurator = null;

        if (null === $configurator) {
            $configurator = new DSNConfigurator();
        }

        return $configurator-&gt;configure(new PHPMailer($exceptions), $dsn);
    }

    /**
     * Configure PHPMailer instance with DSN string.
     *
     * @param PHPMailer $mailer PHPMailer instance
     * @param string    $dsn    DSN
     *
     * @return PHPMailer
     */
    public function configure(PHPMailer $mailer, $dsn)
    {
        $config = $this-&gt;parseDSN($dsn);

        $this-&gt;applyConfig($mailer, $config);

        return $mailer;
    }

    /**
     * Parse DSN string.
     *
     * @param string $dsn DSN
     *
     * @throws Exception If DSN is malformed
     *
     * @return array Configuration
     */
    private function parseDSN($dsn)
    {
        $config = $this-&gt;parseUrl($dsn);

        if (false === $config || !isset($config[&#039;scheme&#039;]) || !isset($config[&#039;host&#039;])) {
            throw new Exception(&#039;Malformed DSN&#039;);
        }

        if (isset($config[&#039;query&#039;])) {
            parse_str($config[&#039;query&#039;], $config[&#039;query&#039;]);
        }

        return $config;
    }

    /**
     * Apply configuration to mailer.
     *
     * @param PHPMailer $mailer PHPMailer instance
     * @param array     $config Configuration
     *
     * @throws Exception If scheme is invalid
     */
    private function applyConfig(PHPMailer $mailer, $config)
    {
        switch ($config[&#039;scheme&#039;]) {
            case &#039;mail&#039;:
                $mailer-&gt;isMail();
                break;
            case &#039;sendmail&#039;:
                $mailer-&gt;isSendmail();
                break;
            case &#039;qmail&#039;:
                $mailer-&gt;isQmail();
                break;
            case &#039;smtp&#039;:
            case &#039;smtps&#039;:
                $mailer-&gt;isSMTP();
                $this-&gt;configureSMTP($mailer, $config);
                break;
            default:
                throw new Exception(
                    sprintf(
                        &#039;Invalid scheme: &quot;%s&quot;. Allowed values: &quot;mail&quot;, &quot;sendmail&quot;, &quot;qmail&quot;, &quot;smtp&quot;, &quot;smtps&quot;.&#039;,
                        $config[&#039;scheme&#039;]
                    )
                );
        }

        if (isset($config[&#039;query&#039;])) {
            $this-&gt;configureOptions($mailer, $config[&#039;query&#039;]);
        }
    }

    /**
     * Configure SMTP.
     *
     * @param PHPMailer $mailer PHPMailer instance
     * @param array     $config Configuration
     */
    private function configureSMTP($mailer, $config)
    {
        $isSMTPS = &#039;smtps&#039; === $config[&#039;scheme&#039;];

        if ($isSMTPS) {
            $mailer-&gt;SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
        }

        $mailer-&gt;Host = $config[&#039;host&#039;];

        if (isset($config[&#039;port&#039;])) {
            $mailer-&gt;Port = $config[&#039;port&#039;];
        } elseif ($isSMTPS) {
            $mailer-&gt;Port = SMTP::DEFAULT_SECURE_PORT;
        }

        $mailer-&gt;SMTPAuth = isset($config[&#039;user&#039;]) || isset($config[&#039;pass&#039;]);

        if (isset($config[&#039;user&#039;])) {
            $mailer-&gt;Username = $config[&#039;user&#039;];
        }

        if (isset($config[&#039;pass&#039;])) {
            $mailer-&gt;Password = $config[&#039;pass&#039;];
        }
    }

    /**
     * Configure options.
     *
     * @param PHPMailer $mailer  PHPMailer instance
     * @param array     $options Options
     *
     * @throws Exception If option is unknown
     */
    private function configureOptions(PHPMailer $mailer, $options)
    {
        $allowedOptions = get_object_vars($mailer);

        unset($allowedOptions[&#039;Mailer&#039;]);
        unset($allowedOptions[&#039;SMTPAuth&#039;]);
        unset($allowedOptions[&#039;Username&#039;]);
        unset($allowedOptions[&#039;Password&#039;]);
        unset($allowedOptions[&#039;Hostname&#039;]);
        unset($allowedOptions[&#039;Port&#039;]);
        unset($allowedOptions[&#039;ErrorInfo&#039;]);

        $allowedOptions = \array_keys($allowedOptions);

        foreach ($options as $key =&gt; $value) {
            if (!in_array($key, $allowedOptions)) {
                throw new Exception(
                    sprintf(
                        &#039;Unknown option: &quot;%s&quot;. Allowed values: &quot;%s&quot;&#039;,
                        $key,
                        implode(&#039;&quot;, &quot;&#039;, $allowedOptions)
                    )
                );
            }

            switch ($key) {
                case &#039;AllowEmpty&#039;:
                case &#039;SMTPAutoTLS&#039;:
                case &#039;SMTPKeepAlive&#039;:
                case &#039;SingleTo&#039;:
                case &#039;UseSendmailOptions&#039;:
                case &#039;do_verp&#039;:
                case &#039;DKIM_copyHeaderFields&#039;:
                    $mailer-&gt;$key = (bool) $value;
                    break;
                case &#039;Priority&#039;:
                case &#039;SMTPDebug&#039;:
                case &#039;WordWrap&#039;:
                    $mailer-&gt;$key = (int) $value;
                    break;
                default:
                    $mailer-&gt;$key = $value;
                    break;
            }
        }
    }

    /**
     * Parse a URL.
     * Wrapper for the built-in parse_url function to work around a bug in PHP 5.5.
     *
     * @param string $url URL
     *
     * @return array|false
     */
    protected function parseUrl($url)
    {
        if (\PHP_VERSION_ID &gt;= 50600 || false === strpos($url, &#039;?&#039;)) {
            return parse_url($url);
        }

        $chunks = explode(&#039;?&#039;, $url);
        if (is_array($chunks)) {
            $result = parse_url($chunks[0]);
            if (is_array($result)) {
                $result[&#039;query&#039;] = $chunks[1];
            }
            return $result;
        }

        return false;
    }
}
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