function _cdn_build_css_cache in CDN 7.2

Same name and namespace in other branches

6.2 cdn.basic.css.inc \_cdn_build_css_cache()

Near-identical to Changes:

the inner loop is modified
uses _cdn_build_css_path() instead of drupal_build_css_path().

File

./cdn.basic.css.inc, line 62: 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_build_css_cache($css, $suffix = '') {

  // Create different CSS aggregation maps for HTTP and HTTPS.
  $https_mapping = variable_get(CDN_BASIC_MAPPING_HTTPS_VARIABLE, '');
  $css_cache_var = cdn_request_is_https() ? 'cdn_css_cache_files_https' : 'cdn_css_cache_files_http';
  $data = '';
  $uri = '';
  $map = variable_get($css_cache_var, array());

  // Create a new array so that only the file names are used to create the hash.
  // This prevents new aggregates from being created unnecessarily.
  $css_data = array();
  foreach ($css as $css_file) {
    $css_data[] = $css_file['data'];
  }
  $key = hash('sha256', serialize($css_data));
  if (isset($map[$key])) {
    $uri = $map[$key];
  }
  if (empty($uri) || !file_exists($uri)) {

    // Build aggregate CSS file.
    foreach ($css as $stylesheet) {

      // Only 'file' stylesheets can be aggregated.
      if ($stylesheet['type'] == 'file') {
        $contents = drupal_load_stylesheet($stylesheet['data'], TRUE);

        // Get the parent directory of this file, relative to the Drupal root.
        $css_base_url = drupal_substr($stylesheet['data'], 0, strrpos($stylesheet['data'], '/'));
        _cdn_build_css_path(NULL, $css_base_url . '/');

        // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
        $data .= preg_replace_callback('/url\\(\\s*[\'"]?(?![a-z]+:|\\/+)([^\'")]+)[\'"]?\\s*\\)/i', '_cdn_build_css_path', $contents);
      }
    }

    // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
    // @import rules must proceed any other style, so we move those to the top.
    $regexp = '/@import[^;]+;/i';
    preg_match_all($regexp, $data, $matches);
    $data = preg_replace($regexp, '', $data);
    $data = implode('', $matches[0]) . $data;

    // Prefix filename to prevent blocking by firewalls which reject files
    // starting with "ad*".
    $filename = 'css_' . drupal_hash_base64($data) . $suffix . '.css';

    // Create the css/ within the files folder.
    $csspath = $css_cache_var == 'cdn_css_cache_files_https' ? 'public://cdn/css/https' : 'public://cdn/css/http';
    $uri = $csspath . '/' . $filename;

    // Create the CSS file.
    file_prepare_directory($csspath, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
    if (!file_exists($uri) && !file_unmanaged_save_data($data, $uri, FILE_EXISTS_REPLACE)) {
      return FALSE;
    }

    // If CSS gzip compression is enabled, clean URLs are enabled (which means
    // that rewrite rules are working) and the zlib extension is available then
    // create a gzipped version of this file. This file is served conditionally
    // to browsers that accept gzip using .htaccess rules.
    if (variable_get('css_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
      if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
        return FALSE;
      }
    }

    // Save the updated map.
    $map[$key] = $uri;
    variable_set($css_cache_var, $map);
  }
  return $uri;
}

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function _cdn_build_css_cache in CDN 7.2

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