function _cdn_css_aggregate in CDN 6.2

Mostly based on drupal_get_css().

1 string reference to '_cdn_css_aggregate'

cdn_theme_registry_alter in ./cdn.module

Implementation of hook_theme_registry_alter().

File

./cdn.basic.css.inc, line 14

Overrides of Drupal's CSS aggregation system. Ensures that files referenced by CSS files are also served from the CDN, according to the CDN module's CSS aggregation rules.

Code

function _cdn_css_aggregate(&$vars) {

  // Don't override Drupal core's aggregation if this page is not going to use
  // a CDN anyway.
  if (!cdn_check_protocol() && !cdn_check_drupal_path($_GET['q'])) {
    return;
  }
  $output = '';
  $prefix = $suffix = '<!-- CSS aggregated by CDN module. -->' . "\n";
  $css = $vars['css'];
  $no_module_preprocess = '';
  $no_theme_preprocess = '';

  // Create different CSS aggregation files for HTTP and HTTPS.
  $schema = cdn_request_is_https() ? 'https' : 'http';
  $query_string = variable_get('css_js_query_string', '0');
  $preprocess_css = variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update');
  $directory = file_directory_path();
  $is_writable = is_dir($directory) && is_writable($directory) && variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC;
  foreach ($css as $media => $types) {

    // If CSS preprocessing is off, we still need to output the styles.
    // Additionally, go through any remaining styles if CSS preprocessing is on and output the non-cached ones.
    foreach ($types as $type => $files) {
      if ($type == 'module') {

        // Setup theme overrides for module styles.
        $theme_styles = array();
        foreach (array_keys($css[$media]['theme']) as $theme_style) {
          $theme_styles[] = basename($theme_style);
        }
      }
      foreach ($types[$type] as $file => $preprocess) {

        // If the theme supplies its own style using the name of the module style, skip its inclusion.
        // This includes any RTL styles associated with its main LTR counterpart.
        if ($type == 'module' && in_array(str_replace('-rtl.css', '.css', basename($file)), $theme_styles)) {

          // Unset the file to prevent its inclusion when CSS aggregation is enabled.
          unset($types[$type][$file]);
          continue;
        }

        // Only include the stylesheet if it exists.
        if (file_exists($file)) {
          if (!$preprocess || !($is_writable && $preprocess_css)) {

            // Also build CSS cache files for other files; so that the file
            // URLs in them are altered to point to the CDN.
            $fake_types = array(
              $type => array(
                $file => TRUE,
              ),
            );
            $filename = 'cdn_css_' . $schema . '_' . md5(serialize($types) . $query_string . 'cdn' . $file) . '_' . basename($file);
            $file = _cdn_build_css_cache($fake_types, $filename);

            // If a CSS file is not to be preprocessed and it's a module CSS file, it needs to *always* appear at the *top*,
            // regardless of whether preprocessing is on or off.
            if (!$preprocess && $type == 'module') {
              $no_module_preprocess .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . _cdn_css_file_create_url($file) . '" />' . "\n";
            }
            elseif (!$preprocess && $type == 'theme') {
              $no_theme_preprocess .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . _cdn_css_file_create_url($file) . '" />' . "\n";
            }
            else {
              $output .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . _cdn_css_file_create_url($file) . '" />' . "\n";
            }
          }
        }
      }
    }
    if ($is_writable && $preprocess_css) {

      // Prefix filename to prevent blocking by firewalls which reject files
      // starting with "ad*".
      $filename = 'cdn_css_' . $schema . '_' . md5(serialize($types) . $query_string . 'cdn') . '.css';
      $preprocess_file = _cdn_build_css_cache($types, $filename);
      $output .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . _cdn_css_file_create_url($preprocess_file) . '" />' . "\n";
    }
  }
  $vars['styles'] = $prefix . $no_module_preprocess . $output . $no_theme_preprocess . $suffix;
}