mod/scorm/loadSCO.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 require_once('../../config.php');
  18 require_once($CFG->dirroot.'/mod/scorm/locallib.php');
  19
  20 $id    = optional_param('id', '', PARAM_INT);    // Course Module ID, or
  21 $a     = optional_param('a', '', PARAM_INT);     // scorm ID
  22 $scoid = required_param('scoid', PARAM_INT);     // sco ID.
  23
  24 $delayseconds = 2;  // Delay time before sco launch, used to give time to browser to define API.
  25
  26 if (!empty($id)) {
  27     if (! $cm = get_coursemodule_from_id('scorm', $id)) {
  28         print_error('invalidcoursemodule');
  29     }
  30     if (! $course = $DB->get_record('course', array('id' => $cm->course))) {
  31         print_error('coursemisconf');
  32     }
  33     if (! $scorm = $DB->get_record('scorm', array('id' => $cm->instance))) {
  34         print_error('invalidcoursemodule');
  35     }
  36 } else if (!empty($a)) {
  37     if (! $scorm = $DB->get_record('scorm', array('id' => $a))) {
  38         print_error('coursemisconf');
  39     }
  40     if (! $course = $DB->get_record('course', array('id' => $scorm->course))) {
  41         print_error('coursemisconf');
  42     }
  43     if (! $cm = get_coursemodule_from_instance('scorm', $scorm->id, $course->id)) {
  44         print_error('invalidcoursemodule');
  45     }
  46 } else {
  47     print_error('missingparameter');
  48 }
  49
  50 $PAGE->set_url('/mod/scorm/loadSCO.php', array('scoid' => $scoid, 'id' => $cm->id));
  51
  52 if (!isloggedin()) { // Prevent login page from being shown in iframe.
  53     // Using simple html instead of exceptions here as shown inside iframe/object.
  54     echo html_writer::start_tag('html');
  55     echo html_writer::tag('head', '');
  56     echo html_writer::tag('body', get_string('loggedinnot'));
  57     echo html_writer::end_tag('html');
  58     exit;
  59 }
  60
  61 require_login($course, false, $cm, false); // Call require_login anyway to set up globals correctly.
  62
  63 // Check if SCORM is available.
  64 scorm_require_available($scorm);
  65
  66 $context = context_module::instance($cm->id);
  67
  68 // Forge SCO URL.
  69 list($sco, $scolaunchurl) = scorm_get_sco_and_launch_url($scorm, $scoid, $context);
  70
  71 if ($sco->scormtype == 'asset') {
  72     $attempt = scorm_get_last_attempt($scorm->id, $USER->id);
  73     $element = (scorm_version_check($scorm->version, SCORM_13)) ? 'cmi.completion_status' : 'cmi.core.lesson_status';
  74     $value = 'completed';
  75     scorm_insert_track($USER->id, $scorm->id, $sco->id, $attempt, $element, $value);
  76 }
  77
  78 // Trigger the SCO launched event.
  79 scorm_launch_sco($scorm, $sco, $cm, $context, $scolaunchurl);
  80
  81 header('Content-Type: text/html; charset=UTF-8');
  82
  83 if ($sco->scormtype == 'asset') {
  84     // HTTP 302 Found => Moved Temporarily.
  85     header('Location: ' . $scolaunchurl);
  86     // Provide a short feedback in case of slow network connection.
  87     echo html_writer::start_tag('html');
  88     echo html_writer::tag('body', html_writer::tag('p', get_string('activitypleasewait', 'scorm')));
  89     echo html_writer::end_tag('html');
  90     exit;
  91 }
  92
  93 // We expect a SCO: select which API are we looking for.
  94 $lmsapi = (scorm_version_check($scorm->version, SCORM_12) || empty($scorm->version)) ? 'API' : 'API_1484_11';
  95
  96 echo html_writer::start_tag('html');
  97 echo html_writer::start_tag('head');
  98 echo html_writer::tag('title', 'LoadSCO');
  99 ?>
 100     <script type="text/javascript">
 101     //<![CDATA[
 102     var myApiHandle = null;
 103     var myFindAPITries = 0;
 104
 105     function myGetAPIHandle() {
 106        myFindAPITries = 0;
 107        if (myApiHandle == null) {
 108           myApiHandle = myGetAPI();
 109        }
 110        return myApiHandle;
 111     }
 112
 113     function myFindAPI(win) {
 114        while ((win.<?php echo $lmsapi; ?> == null) && (win.parent != null) && (win.parent != win)) {
 115           myFindAPITries++;
 116           // Note: 7 is an arbitrary number, but should be more than sufficient
 117           if (myFindAPITries > 7) {
 118              return null;
 119           }
 120           win = win.parent;
 121        }
 122        return win.<?php echo $lmsapi; ?>;
 123     }
 124
 125     // hun for the API - needs to be loaded before we can launch the package
 126     function myGetAPI() {
 127        var theAPI = myFindAPI(window);
 128        if ((theAPI == null) && (window.opener != null) && (typeof(window.opener) != "undefined")) {
 129           theAPI = myFindAPI(window.opener);
 130        }
 131        if (theAPI == null) {
 132           return null;
 133        }
 134        return theAPI;
 135     }
 136
 137    function doredirect() {
 138         if (myGetAPIHandle() != null) {
 139             location = "<?php echo $scolaunchurl ?>";
 140         }
 141         else {
 142             document.body.innerHTML = "<p><?php echo get_string('activityloading', 'scorm');?>" +
 143                                         "<span id='countdown'><?php echo $delayseconds ?></span> " +
 144                                         "<?php echo get_string('numseconds', 'moodle', '');?>. &nbsp; " +
 145                                         "<?php echo addslashes($OUTPUT->pix_icon('wait', '', 'scorm')); ?></p>";
 146             var e = document.getElementById("countdown");
 147             var cSeconds = parseInt(e.innerHTML);
 148             var timer = setInterval(function() {
 149                                             if( cSeconds && myGetAPIHandle() == null ) {
 150                                                 e.innerHTML = --cSeconds;
 151                                             } else {
 152                                                 clearInterval(timer);
 153                                                 document.body.innerHTML = "<p><?php echo get_string('activitypleasewait', 'scorm');?></p>";
 154                                                 location = "<?php echo $scolaunchurl ?>";
 155                                             }
 156                                         }, 1000);
 157         }
 158     }
 159     //]]>
 160     </script>
 161     <noscript>
 162         <meta http-equiv="refresh" content="0;url=<?php echo $scolaunchurl ?>" />
 163     </noscript>
 164 <?php
 165 echo html_writer::end_tag('head');
 166 echo html_writer::tag('body', html_writer::tag('p', get_string('activitypleasewait', 'scorm')), array('onload' => "doredirect();"));
 167 echo html_writer::end_tag('html');