function ais_image_style_deliver in Adaptive Image Styles (ais) 7

Wrapper for image_style_deliver() that handles adaptive image styles.

1 string reference to 'ais_image_style_deliver'

ais_menu_alter in ./ais.module

Implements hook_menu_alter().

File

./ais.module, line 94

Adaptive Image Styles Module

Code

function ais_image_style_deliver($style, $scheme) {
  $args = func_get_args();
  array_shift($args);
  array_shift($args);
  $target = implode('/', $args);

  // By design, this module allows HTTP clients to switch between different
  // adaptive image styles for the same image. Therefore, if the request has
  // the correct security token for the main adaptive style, we can safely
  // deliver any other adaptive style also.
  $bypass_granted = FALSE;
  if (!variable_get('image_allow_insecure_derivatives', FALSE) && defined('IMAGE_DERIVATIVE_TOKEN')) {

    // First check that an adaptive style is being requested.
    $styles = variable_get('ais_adaptive_styles', array());
    $bypass = isset($style['name']) && _ais_is_used($style['name'], $styles);

    // Next check that a valid token for the main adaptive style is present.
    $bypass = $bypass && isset($_GET[IMAGE_DERIVATIVE_TOKEN]) && $_GET[IMAGE_DERIVATIVE_TOKEN] === image_style_path_token(AIS_ADAPTIVE_STYLE, $scheme . '://' . $target);

    // If so, we can bypass the standard image_style_deliver() security check
    // for this request.
    if ($bypass) {
      $bypass_granted = TRUE;
      $GLOBALS['conf']['image_allow_insecure_derivatives'] = TRUE;
    }
  }

  // Execute the standard page callback.
  $func_args = func_get_args();
  $return = call_user_func_array('image_style_deliver', $func_args);

  // Before returning, reset the 'image_allow_insecure_derivatives' variable if
  // we changed it above.
  if ($bypass_granted) {
    $GLOBALS['conf']['image_allow_insecure_derivatives'] = FALSE;
  }
  return $return;
}