function protocol_relative_urls_file_url_alter in Protocol Relative URLs 8

Same name and namespace in other branches

1. 7 protocol_relative_urls.module \protocol_relative_urls_file_url_alter()

Implements hook_file_url_alter().

Make URLs protocol relative. Note: protocol relative URLs will cause IE7/8 to download stylesheets twice.

File

./protocol_relative_urls.module, line 9

Code

function protocol_relative_urls_file_url_alter(&$url) {
  global $base_url;
  static $relative_base_url = NULL, $relative_base_length = NULL;
  $scheme = file_uri_scheme($url);

  // For some things (e.g., images) hook_file_url_alter can be called multiple
  // times. So, we have to be sure not to alter it multiple times. If we already
  // are relative protocol we can just return.
  // Only setup and parse this once.
  if (!$relative_base_url || !$relative_base_length) {
    $relative_base_url = '//' . file_uri_target($base_url);
    $relative_base_length = strlen($relative_base_url);
  }
  if (!$scheme && substr($url, 0, $relative_base_length) == $relative_base_url) {
    return;
  }

  // Handle the case where we have public files with the scheme public:// or
  // the case the relative path doesn't start with a /. Internal relative urls
  // have the base url prepended to them.
  if (!$scheme || $scheme == 'public') {

    // Internal Drupal paths.
    if (!$scheme) {
      $path = $url;
    }
    else {
      $wrapper = \Drupal::service('stream_wrapper_manager')
        ->getViaScheme($scheme);
      $path = $wrapper
        ->getDirectoryPath() . '/' . file_uri_target($url);
    }

    // Clean up Windows paths.
    $path = str_replace('\\', '/', $path);
    $url = $base_url . '/' . $path;
  }

  // Convert full URLs to relative protocol.
  $protocols = array(
    'http',
    'https',
  );
  $scheme = file_uri_scheme($url);
  if ($scheme && in_array($scheme, $protocols)) {
    $url = '//' . file_uri_target($url);
  }
}