candela-thin-export.php

<?php
/*
Plugin Name: Candela Thin Exports
Description: A simple plugin to export Pressbooks books as thin cartridges with deep links to each page.
Version: 0.1
Author: Lumen Learning
Author URI: http://lumenlearning.com
*/
require_once('thincc_manage.php');
require_once('cc/manifest.php');

if ( ! defined( 'CC_EXPORT_PLUGIN_DIR' ) ) {
  define( 'CC_EXPORT_PLUGIN_DIR', __DIR__ . '/' );
}

if ( ! defined( 'CC_EXPORT_PLUGIN_URL' ) ) {
  define( 'CC_EXPORT_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
}

include CC_EXPORT_PLUGIN_DIR . 'includes/api_endpoint.php';


register_activation_hook(__FILE__, 'install_thin_exports');
function install_thin_exports()
{
  if (version_compare(get_bloginfo('version'), '4.0', '<')) {
    deactivate_plugins(basename(__FILE__));
  }
}

add_action('admin_menu', 'thincc_admin_page');
function thincc_admin_page()
{
  $plugin_page = add_management_page('Export Common Cartridge', 'Export Common Cartridge', 'export', basename(__FILE__), 'thincc_manage');
  add_action('load-' . $plugin_page, 'thincc_add_js');
}

if (isset($_POST['cc_download'])) {

  add_action('wp_loaded', 'thin_cc_download', 1);
  function thin_cc_download()
  {
    thincc_ajax();
    die();
  }
}

add_action('wp_ajax_thincc_ajax', 'thincc_ajax');
function thincc_ajax()
{
  $sitename = sanitize_key(get_bloginfo('name'));
  if (!empty($sitename)) $sitename .= '-';
  $options = process_thincc_options($_POST);
  $filename = $sitename . $options['version'] . '-' . date('Y-m-d');

  if ($options['version'] == 'flat') {
    $options['inline'] = true;
    $options['version'] = "1.3";
  }

  if(isset($_POST['cc_download']) && $_POST['cc_download'] == '0') {
    $options['inline'] = true;
    $manifest = new \CC\Manifest(\PressBooks\Book::getBookStructure('', true), $options);
    $manifest->build_manifest();

    header('Content-Description: File Transfer');
    header('Content-Disposition: attachment; filename=' . $filename . '.xml');
    header('Content-Type: text/plain; charset=' . get_option('blog_charset'), true);

    echo '<pre>', htmlentities($manifest), '</pre>';
  } else {
    if( !isset($options['version']) ){
      $options['version'] = '1.2';
    }
    $manifest = new \CC\Manifest(\PressBooks\Book::getBookStructure('', true), $options);
    $manifest->build_manifest();

    if( $options['inline'] ){
      $file = $manifest->build_flat_file();

      header('Content-Type: text/xml');
      header('Content-Length: ' . filesize($file));
      header('Content-Disposition: attachment; filename="' . $filename . '.xml"');
      readfile($file);
    } else {
      $file = $manifest->build_zip();

      header('Content-Type: application/vnd.ims.imsccv1p2+application/zip');
      header('Content-Length: ' . filesize($file));
      header('Content-Disposition: attachment; filename="' . $filename . '.zip"');
      readfile($file);
    }
  }
}

function process_thincc_options($data){
  $options = [];
  foreach (\CC\Manifest::$available_options as $key){
    if(isset($data[$key])) {
      $options[$key] = true;
    } else {
      $options[$key] = false;
    }
  }

  if(isset($data["version"])) {
    $options["version"] = $data["version"];
  }

  return $options;
}

?>