function fast_404_ext_check in Fast 404 7

Same name and namespace in other branches

1. 6 fast_404.inc \fast_404_ext_check()

1 call to fast_404_ext_check()

fast_404_boot in ./fast_404.module

Implements hook_boot().

File

./fast_404.inc, line 3

Code

function fast_404_ext_check() {

  // Check to see if Fast 404 checks are disabled.
  if (!variable_get('fast_404_extension_check', TRUE)) {
    return TRUE;
  }

  // Ignores if the current script is running in a command-line environment.
  if (drupal_is_cli()) {
    return TRUE;
  }

  // Determine the request uri. We are only interested in the path component,
  // so strip out any other information. Since parse_url() is does not work well
  // with relative URLs, we temporarily prepend a dummy scheme and domain name.
  $uri = request_uri();
  $path = parse_url('http://example.com' . $uri, PHP_URL_PATH);

  // Ignore calls to the homepage, to avoid unnecessary processing.
  if ($path == '/') {
    return TRUE;
  }

  // Check to see if the URL is an imagecache URL, those are handled via
  // Drupal.
  if (strpos($path, 'styles/')) {

    // Check to see if we will allow anon users to access this page.
    if (!variable_get('fast_404_allow_anon_imagecache', TRUE)) {
      $found_session = FALSE;

      // At this stage of the game we don't know if the user is logged in via
      // regular function calls. Simply look for a session cookie. If we find
      // one we'll assume they're logged in.
      foreach ($_COOKIE as $k => $v) {
        if (stristr($k, 'SESS')) {
          $found_session = TRUE;
          break;
        }
      }

      // Found a session. We're going to assume they're logged in.
      if ($found_session) {
        return TRUE;
      }
    }
    else {
      return TRUE;
    }
  }

  // If we are using URL whitelisting then determine if the current URL is
  // whitelisted before running the extension check.
  if (variable_get('fast_404_url_whitelisting', FALSE)) {
    $allowed = variable_get('fast_404_whitelist', array());
    if (in_array($path, $allowed)) {

      // URL is whitelisted. Assumed good.
      return TRUE;
    }
  }

  // Check for whitelisted strings in the URL.
  if (is_array(variable_get('fast_404_string_whitelisting', FALSE))) {
    foreach (variable_get('fast_404_string_whitelisting', array()) as $str) {
      if (strstr($path, $str) !== FALSE) {
        return TRUE;
      }
    }
  }

  // Load up the blacklisted extensions.
  $exts = variable_get('fast_404_exts', '/^(?!robots).*\\.(txt|png|gif|jpe?g|css|js|ico|swf|flv|cgi|bat|pl|dll|exe|asp)$/i');

  // Determine if URL is in blacklisted extensions.
  if ($exts && preg_match($exts, $path, $m)) {
    fast_404_error_return(FALSE, variable_get('fast_404_return_gone', FALSE));
  }
  define('FAST_404_EXT_CHECKED', TRUE);
}