usasearch.module

<?php
/**
 * @file
 * Replaces Drupal search, redirects all search queries to USASearch service.
 */

/**
 * Implements hook_menu().
 */
function usasearch_menu() {
  $items = array();

  $items['admin/config/search/usasearch'] = array(
    'title' => 'USASearch settings',
    'description' => 'Contains settings for customizing site search to use USASearch',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('usasearch_admin'),
    'access arguments' => array('administer search'),
    'file' => 'usasearch.admin.inc',
  );
  return $items;
}

/**
 * Implements hook_form_alter().
 *
 * Changes elements in the search block, search theme form, search page form.
 */
function usasearch_form_alter(&$form, &$form_state, $form_id) {

  if ($form_id == 'search_block_form' || $form_id == 'search_theme_form' || $form_id == 'search_form') {
    $affiliate_name = check_plain(variable_get('usasearch_affiliate_name', ''));
    if ($affiliate_name) {

      // Create attributes array for textfield.
      $attributes = array(
        'class' => array('usagov-search-autocomplete',
          'ui-autocomplete-input',
          'ui-corner-all'),
        'autocomplete' => 'off',
        'type' => 'text',
        // Adding the id attribute can cause issues that rely on default Drupal
        // ids for form elements. It does not appear to be necessary for
        // typeahead to function. So, we leave it out.
        // 'id' => 'query',
      );

      // Apply attriubutes to the correct form element.
      switch ($form_id) {
        case 'search_form':
          $form['basic']['keys']['#attributes'] = $attributes;
          break;

        default:
          $form[$form_id]['#attributes'] = $attributes;
          break;
      }

    }
  }
}


/**
 * Implements hook_preprocess_page().
 *
 * Outputs required javascript and css references.
 */
function usasearch_preprocess_page(&$variables) {
  $inline_js = '';

  // Check for usasearch_affiliate_name variable, if set output javascript and
  // css references. Detailed info about this USASearch feature here:
  // @see http://usasearch.howto.gov/post/18861028503/how-to-add-our-code-to-your-website.
  $affiliate_name = check_plain(variable_get('usasearch_affiliate_name', ''));
  if ($affiliate_name) {
    $action_domain = check_plain(variable_get('usasearch_action_domain', 'http://search.usa.gov'));

    $inline_js .= "var usasearch_config = { siteHandle:'$affiliate_name' };\n";

    if (variable_get('usasearch_autocomplete', TRUE)) {
      $inline_js .= "var script = document.createElement('script');\n";
      $inline_js .= "script.type = 'text/javascript';\n";
      $inline_js .= "script.src = '$action_domain/javascripts/remote.loader.js';\n";
      $inline_js .= "document.getElementsByTagName('head')[0].appendChild(script);\n";
    }
  }

  // Output contents of $inline_js into one combined inline javascript tag using
  // drupal_add_js function.
  drupal_add_js($inline_js, array('type' => 'inline', 'scope' => 'footer'));
}

/**
 * Returns an array of subsites.
 *
 * @return array
 *   The available subsites.
 */
function usasearch_affiliates_list() {
  $subsites_string = variable_get('usasearch_allowed_affiliates', '');

  module_load_include('module', 'list');
  $subsites = list_extract_allowed_values($subsites_string, 'list text', FALSE);

  $default_affiliate = variable_get('usasearch_affiliate_name');
  if ($default_affiliate && empty($subsites[$default_affiliate])) {
    $subsites = array($default_affiliate => t('Default')) + $subsites;
  }

  return $subsites;
}

/**
 * Verifies that a given subsite is in list of configured subsites.
 *
 * @param string $affiliate_id
 *   The affiliate id to verify.
 *
 * @return bool
 *   TRUE if the given subsite is in the list of configured subsites.
 */
function usasearch_is_affiliate($affiliate_id) {
  $subsites = usasearch_affiliates_list();

  return array_key_exists($affiliate_id, $subsites);
}