islandora_embed.module

<?php

/**
 * @file
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * Implements hook_menu().
 *
 * @return string
 */
function islandora_embed_menu() {
  $items = array();
  $items['embed_service/uuid'] = array(
    'title' => 'Islandora Embed',
    'description' => "Interpret the embedding request and send back JSON objects",
    'page callback' => 'uuid_embed_object',
    'type' => MENU_CALLBACK,
    'access callback' => TRUE,
  );

  $items['islandora/embed/object/%islandora_object'] = array(
    'title' => 'Islandora Embed',
    'description' => "Send back JSON objects in response to oembed requests",
    'page callback' => 'islandora_embed_object',
    'page arguments' => array(3),
    'type' => MENU_CALLBACK,
    'access callback' => TRUE,
  );
  $items['islandora/embed/object_UI/%islandora_object'] = array(
    'title' => 'Islandora Embed',
    'description' => "Send back JSON objects in response to oembed requests",
    'page callback' => 'islandora_embed_object_UI',
    'page arguments' => array(3),
    'type' => MENU_CALLBACK,
    'access callback' => TRUE,
  );
    $items['embed/uuid/%'] = array(
    'title' => 'Uuid Embed',
    'description' => "Send back JSON objects in response to oembed requests",
    'page callback' => 'uuid_embed_object_interpret',
    'page arguments' => array(2),
    'type' => MENU_CALLBACK,
    'access callback' => TRUE,
  );
  return $items;
}

/**
 * Redirects Oembed requests to appropriate content model module.
 */
function islandora_embed() {
  $parameters = drupal_get_query_parameters($query = NULL);
  if (isset($parameters['url']) && $parameters['url'] != "") {
    $url = $parameters['url'];
    unset($parameters['url']);
    drupal_goto($url, array('query' => $parameters));
  }
  exit();
}

/**
 * 
 */
function uuid_embed_object_interpret(){
    global $base_url;

    $path = current_path();
    $parameters_string = $_SERVER['QUERY_STRING'];
    $url = $base_url . "/embed_service/uuid/?url=" . $base_url . "/" . $path."?".$parameters_string; 
    drupal_goto($url);
   // print $url;
}

/**
 * Generate the response based on the Oembed requests.
 *
 * @global type $base_url
 * @param AbstractFedoraObject $object
 * The object.
 *
 * @return JSON object
 * JSON object containing data for being processed by the Oembed module
 * to generate embedded display.
 */
function islandora_embed_object(AbstractFedoraObject $object) {
  global $base_url;
  module_load_include('inc', 'islandora_embed', 'includes/response_generator');
  $fedoraObjExt = new FedoraObjectExtended($object->id, $object->repository);
  if (isset($_GET['maxwidth'])) {
    $maxwidth = $_GET['maxwidth'];
  }
  elseif (isset($_GET['width'])) {
    $maxwidth = $_GET['width'];
  }
  if (isset($_GET['maxheight'])) {
    $maxheight = $_GET['maxheight'];
  }
  elseif (isset($_GET['height'])) {
    $maxheight = $_GET['height'];
  }
  $resGenerator = new RespsonseGenerator($fedoraObjExt, $base_url, $maxheight, $maxwidth, $maxheight, $maxwidth);
  $resGenerator->getJSONResponse();
}

/**
 * Redirects the requests directly to the display of content model without returning JSON objects.
 *
 * @global type $base_url
 * @param AbstractFedoraObject $object
 * The object.
 */
function islandora_embed_object_UI(AbstractFedoraObject $object) {
  global $base_url;
  module_load_include('inc', 'islandora_embed', 'includes/response_generator');
  module_load_include('inc', 'islandora', 'islandora.module');
  $fedoraObjExt = new FedoraObjectExtended($object->id, $object->repository);
  if (isset($_GET['maxwidth'])) {
    $maxwidth = $_GET['maxwidth'];
  }
  elseif (isset($_GET['width'])) {
    $maxwidth = $_GET['width'];
  }
  if (isset($_GET['maxheight'])) {
    $maxheight = $_GET['maxheight'];
  }
  elseif (isset($_GET['height'])) {
    $maxheight = $_GET['height'];
  }
  $resGenerator = new RespsonseGenerator($fedoraObjExt, $base_url, $maxheight, $maxwidth);
  $resGenerator->getEmbeddedObjUI();
}

/**
* Interpret and the request and get the URL pattern
* '/islandora/embed/object/islandora%3Auuid?height=h&width=w' and redirect the request to the interpreted URL
*/
function uuid_embed_object() {
  $parameters = array();
  $parameters_string = $_SERVER['QUERY_STRING'];
  parse_str($parameters_string, $parameters);
  $url = urldecode($parameters['url']);
  if(!empty($parameters['maxheight']) || !empty($parameters['height'])){
      $height = !empty($parameters['maxheight']) ? $parameters['maxheight'] : $parameters['height'];
  }
  if(!empty($parameters['maxwidth']) || !empty($parameters['width'])){
      $width = !empty($parameters['maxwidth']) ? $parameters['maxwidth'] : $parameters['width'];
  }
  $query_string = "";
  if(!empty($height) || !empty($width)){
      $query_string = "?";
      if(!empty($height)){
          $query_string .= "height=".$height;
      }
      if(!empty($width)){
            if(!empty($height)){
              $query_string .= "&";
            }
            $query_string .= "width=".$width;
      }
  }
  $url = $url.$query_string;
  if (isset($url) && $url != "") {
    $translated_url = getTranslatedUrl($url);
    drupal_goto($translated_url);
  }
  exit();
}

/**
* Translate the url pattern from '/embed/uuid/uuid' to '/islandora/embed/object/islandora%3Auuid'
*/
function getTranslatedUrl($url) {
    module_load_include('inc', 'islandora_embed', 'includes/utilities');
    try{
        $url_arr = explode("/embed/uuid/",$url);
        $uuid = $url_arr[count($url_arr)-1];
	$uuid_arr = explode("?", $uuid);
	$path = 'uuid/'.$uuid_arr[0];
	$prefix = _get_pid_prefix($path);
	$pid_prefix = urlencode($prefix.":");
	$translatedUrl = $url_arr[0]."/islandora/embed/object/".$pid_prefix.$uuid;
        return $translatedUrl;
    }
    catch(Exception $ex){
        echo "The uuid cannot be translated!\n";
        echo $exc->getTraceAsString();
    }
}

/**
 * Implements hook_theme().
*/
function islandora_embed_theme(){
    return array(    
    'islandora_internet_archive_bookreader_book_info' => array(
      'file' => 'theme/theme.inc',
      'template' => 'theme/islandora-embed',
      'variables' => array('object' => NULL),
    ),
  );
}