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Location: SlatePermutate/ajax.php

binki
Fix qTips not appearing for certain courses because of partial XML underquoting.

Some courses which had ampersands in their titles would cause XML parsing errors in
the browser when trying to display the qTip, resulting in the qTip not showing
for those courses. This is because the qTip’s content is inserted as XHTML into
the document, so it needs to be doubly encoded.
<?php /* -*- mode: php; -*- */
/*
 * Copyright 2011 Nathan Phillip Brink <ohnobinki@ohnopublishing.net>
 *
 * This file is a part of slate_permutate.
 *
 * slate_permutate is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * slate_permutate is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with slate_permutate.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 *   This file is an endpoint for generic AJAX requests (as opposed to
 *   autocompletion of course names).
 */

require_once('inc/school.inc');
require_once('inc/class.page.php');
require_once('inc/class.course.inc');

page::session_start();

/* should the following block of code be moved into a proposed Page::json()? */
if (isset($_REQUEST['txt'])) {
  header('Content-Type: text/plain; encoding=utf-8');
}
else {
  header('Content-Type: application/json; encoding=utf-8');
}

/**
 * \brief
 *   Wrap an error message up in JSON and send it.
 *
 * \param $message
 *   A valid XHTML fragment which will be wrapped in <div class="error" />
 */
function slate_permutate_json_error($message)
{
  echo json_encode(array('success' => FALSE, 'message' => '<div class="error">' . $message . '</div>'));
  exit;
}

/**
 * \brief
 *   Send a successful JSON response.
 *
 * \param $data
 *   A PHP array to be encoded with json_encode() and sent as
 *   obj.data.
 */
function slate_permutate_json_success(array $data = array())
{
  echo json_encode(array('success' => TRUE, 'data' => $data));
  exit;
}

if (isset($_REQUEST['school_registration_html']))
  {
    /*
     * Since we're just an AJAX callback, ask school_load_guess() not
     * to update $_SESSION with the school the user is using... And
     * make sure that the frontend actually tells us what school the
     * user is using ;-).
     */
    $school = school_load_guess(FALSE);
    if (empty($school))
      slate_permutate_json_error('Unable to load any school.');

    $page = page::page_create('');

    $courses = array();
    if (!empty($_REQUEST['courses']) && is_array($_REQUEST['courses']))
      {
	/*
	 * The below course deserialization blob should be moved into
	 * the Course object.
	 */
	foreach ($_REQUEST['courses'] as $course_json)
	  {
	    $course = Course::from_json_array($course_json);
	    if (!empty($course))
	      $courses[] = $course;
	  }
      }

    $html = school_registration_html($page, $school, $courses);
    if (empty($html))
      slate_permutate_json_error('School\'s registration information producer returned no data.');
    slate_permutate_json_success(is_array($html) ? $html : array('html' => $html));
  }

slate_permutate_json_error('Unrecognized command.');