<?php

/**
 * @file
 * Advanced aggregation sri module.
 */

/**
 * @addtogroup default_variables
 * @{
 */

/**
 * Default value of the SHA hash level.
 */
define('ADVAGG_SRI', 0);

/**
 * Default value to force SRI to always be generated.
 */
define('ADVAGG_SRI_FILE_GENERATION', FALSE);

/**
 * @} End of "addtogroup default_variables".
 */

/**
 * @addtogroup hooks
 * @{
 */

/**
 * Implements hook_menu().
 */
function advagg_sri_menu() {
  $file_path = drupal_get_path('module', 'advagg_sri');
  $config_path = advagg_admin_config_root_path();

  $items[$config_path . '/advagg/sri'] = array(
    'title' => 'Subresource Integrity',
    'description' => 'Hash aggregated files.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('advagg_sri_admin_settings_form'),
    'type' => MENU_LOCAL_TASK,
    'access arguments' => array('administer site configuration'),
    'file path' => $file_path,
    'file' => 'advagg_sri.admin.inc',
    'weight' => 10,
  );

  return $items;
}

/**
 * Implements hook_module_implements_alter().
 */
function advagg_sri_module_implements_alter(&$implementations, $hook) {
  // Move advagg_sri to the bottom.
  if ($hook === 'advagg_save_aggregate_alter' && array_key_exists('advagg_sri', $implementations)) {
    $item = $implementations['advagg_sri'];
    unset($implementations['advagg_sri']);
    $implementations['advagg_sri'] = $item;
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function advagg_sri_form_advagg_admin_settings_form_alter(&$form, $form_state) {
  // Disable httprl if SRI is set to always on.
  if (variable_get('advagg_sri_file_generation', ADVAGG_SRI_FILE_GENERATION)) {
    $form['global']['advagg_use_httprl']['#default_value'] = FALSE;
    $form['global']['advagg_use_httprl']['#disabled'] = TRUE;
    $form['global']['advagg_use_httprl']['#description'] = t('The Subresource Integrity submodule has disabled httprl usage. This is the "Always output the page with the subresource integrity attribute" checkbox.');
  }
}

/**
 * @} End of "addtogroup hooks".
 */