Return the session cookie domain.

The Set-Cookie response header and its domain attribute are defined in RFC 2109, RFC 2965 and RFC 6265 each one superseding the previous version.

@returns string|null The session cookie domain, or NULL if the calculated value is invalid.

Parameters

\Symfony\Component\HttpFoundation\Request $request: The request.

See also

http://tools.ietf.org/html/rfc2109

http://tools.ietf.org/html/rfc2965

http://tools.ietf.org/html/rfc6265

1 call to SessionConfiguration::getCookieDomain()

SessionConfiguration::getOptions in core/lib/Drupal/Core/Session/SessionConfiguration.php

Returns a list of options suitable for passing to the session storage.

File

core/lib/Drupal/Core/Session/SessionConfiguration.php, line 124

Class

SessionConfiguration

Defines the default session configuration generator.

Namespace

Drupal\Core\Session

Code

protected function getCookieDomain(Request $request) {
  if (isset($this->options['cookie_domain'])) {
    $cookie_domain = $this->options['cookie_domain'];
  }
  else {
    $host = $request->getHost();
    // To maximize compatibility and normalize the behavior across user
    // agents, the cookie domain should start with a dot.
    $cookie_domain = '.' . $host;
  }
  // Cookies for domains without an embedded dot will be rejected by user
  // agents in order to defeat malicious websites attempting to set cookies
  // for top-level domains. Also IP addresses may not be used in the domain
  // attribute of a Set-Cookie header. IPv6 addresses will not pass the first
  // test, so it's acceptable to bias the second test to IPv4.
  if (count(explode('.', $cookie_domain)) > 2 && !is_numeric(str_replace('.', '', $cookie_domain))) {
    return $cookie_domain;
  }
}

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