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   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 closed.
  64  $timenow = time();
  65  if ($scorm->timeclose != 0) {
  66      if ($scorm->timeopen > $timenow) {
  67          print_error('notopenyet', 'scorm', null, userdate($scorm->timeopen));
  68      } else if ($timenow > $scorm->timeclose) {
  69          print_error('expired', 'scorm', null, userdate($scorm->timeclose));
  70      }
  71  }
  72  
  73  $context = context_module::instance($cm->id);
  74  
  75  if (!empty($scoid)) {
  76      // Direct SCO request.
  77      if ($sco = scorm_get_sco($scoid)) {
  78          if ($sco->launch == '') {
  79              // Search for the next launchable sco.
  80              if ($scoes = $DB->get_records_select(
  81                      'scorm_scoes',
  82                      'scorm = ? AND '.$DB->sql_isnotempty('scorm_scoes', 'launch', false, true).' AND id > ?',
  83                      array($scorm->id, $sco->id),
  84                      'sortorder, id')) {
  85                  $sco = current($scoes);
  86              }
  87          }
  88      }
  89  }
  90  
  91  // If no sco was found get the first of SCORM package.
  92  if (!isset($sco)) {
  93      $scoes = $DB->get_records_select(
  94          'scorm_scoes',
  95          'scorm = ? AND '.$DB->sql_isnotempty('scorm_scoes', 'launch', false, true),
  96          array($scorm->id),
  97          'sortorder, id'
  98      );
  99      $sco = current($scoes);
 100  }
 101  
 102  if ($sco->scormtype == 'asset') {
 103      $attempt = scorm_get_last_attempt($scorm->id, $USER->id);
 104      $element = (scorm_version_check($scorm->version, SCORM_13)) ? 'cmi.completion_status' : 'cmi.core.lesson_status';
 105      $value = 'completed';
 106      $result = scorm_insert_track($USER->id, $scorm->id, $sco->id, $attempt, $element, $value);
 107  }
 108  
 109  // Forge SCO URL.
 110  $connector = '';
 111  $version = substr($scorm->version, 0, 4);
 112  if ((isset($sco->parameters) && (!empty($sco->parameters))) || ($version == 'AICC')) {
 113      if (stripos($sco->launch, '?') !== false) {
 114          $connector = '&';
 115      } else {
 116          $connector = '?';
 117      }
 118      if ((isset($sco->parameters) && (!empty($sco->parameters))) && ($sco->parameters[0] == '?')) {
 119          $sco->parameters = substr($sco->parameters, 1);
 120      }
 121  }
 122  
 123  if ($version == 'AICC') {
 124      require_once("$CFG->dirroot/mod/scorm/datamodels/aicclib.php");
 125      $aiccsid = scorm_aicc_get_hacp_session($scorm->id);
 126      if (empty($aiccsid)) {
 127          $aiccsid = sesskey();
 128      }
 129      $scoparams = '';
 130      if (isset($sco->parameters) && (!empty($sco->parameters))) {
 131          $scoparams = '&'. $sco->parameters;
 132      }
 133      $launcher = $sco->launch.$connector.'aicc_sid='.$aiccsid.'&aicc_url='.$CFG->wwwroot.'/mod/scorm/aicc.php'.$scoparams;
 134  } else {
 135      if (isset($sco->parameters) && (!empty($sco->parameters))) {
 136          $launcher = $sco->launch.$connector.$sco->parameters;
 137      } else {
 138          $launcher = $sco->launch;
 139      }
 140  }
 141  
 142  if (scorm_external_link($sco->launch)) {
 143      // TODO: does this happen?
 144      $result = $launcher;
 145  } else if ($scorm->scormtype === SCORM_TYPE_EXTERNAL) {
 146      // Remote learning activity.
 147      $result = dirname($scorm->reference).'/'.$launcher;
 148  } else if ($scorm->scormtype === SCORM_TYPE_LOCAL && strtolower($scorm->reference) == 'imsmanifest.xml') {
 149      // This SCORM content sits in a repository that allows relative links.
 150      $result = "$CFG->wwwroot/pluginfile.php/$context->id/mod_scorm/imsmanifest/$scorm->revision/$launcher";
 151  } else if ($scorm->scormtype === SCORM_TYPE_LOCAL or $scorm->scormtype === SCORM_TYPE_LOCALSYNC) {
 152      // Note: do not convert this to use get_file_url() or moodle_url()
 153      // SCORM does not work without slasharguments and moodle_url() encodes querystring vars.
 154      $result = "$CFG->wwwroot/pluginfile.php/$context->id/mod_scorm/content/$scorm->revision/$launcher";
 155  }
 156  
 157  // Trigger a Sco launched event.
 158  $event = \mod_scorm\event\sco_launched::create(array(
 159      'objectid' => $sco->id,
 160      'context' => $context,
 161      'other' => array('instanceid' => $scorm->id, 'loadedcontent' => $result)
 162  ));
 163  $event->add_record_snapshot('course_modules', $cm);
 164  $event->add_record_snapshot('scorm', $scorm);
 165  $event->add_record_snapshot('scorm_scoes', $sco);
 166  $event->trigger();
 167  
 168  header('Content-Type: text/html; charset=UTF-8');
 169  
 170  if ($sco->scormtype == 'asset') {
 171      // HTTP 302 Found => Moved Temporarily.
 172      header('Location: ' . $result);
 173      // Provide a short feedback in case of slow network connection.
 174      echo html_writer::start_tag('html');
 175      echo html_writer::tag('body', html_writer::tag('p', get_string('activitypleasewait', 'scorm')));
 176      echo html_writer::end_tag('html');
 177      exit;
 178  }
 179  
 180  // We expect a SCO: select which API are we looking for.
 181  $lmsapi = (scorm_version_check($scorm->version, SCORM_12) || empty($scorm->version)) ? 'API' : 'API_1484_11';
 182  
 183  echo html_writer::start_tag('html');
 184  echo html_writer::start_tag('head');
 185  echo html_writer::tag('title', 'LoadSCO');
 186  ?>
 187      <script type="text/javascript">
 188      //<![CDATA[
 189      var myApiHandle = null;
 190      var myFindAPITries = 0;
 191  
 192      function myGetAPIHandle() {
 193         myFindAPITries = 0;
 194         if (myApiHandle == null) {
 195            myApiHandle = myGetAPI();
 196         }
 197         return myApiHandle;
 198      }
 199  
 200      function myFindAPI(win) {
 201         while ((win.<?php echo $lmsapi; ?> == null) && (win.parent != null) && (win.parent != win)) {
 202            myFindAPITries++;
 203            // Note: 7 is an arbitrary number, but should be more than sufficient
 204            if (myFindAPITries > 7) {
 205               return null;
 206            }
 207            win = win.parent;
 208         }
 209         return win.<?php echo $lmsapi; ?>;
 210      }
 211  
 212      // hun for the API - needs to be loaded before we can launch the package
 213      function myGetAPI() {
 214         var theAPI = myFindAPI(window);
 215         if ((theAPI == null) && (window.opener != null) && (typeof(window.opener) != "undefined")) {
 216            theAPI = myFindAPI(window.opener);
 217         }
 218         if (theAPI == null) {
 219            return null;
 220         }
 221         return theAPI;
 222      }
 223  
 224     function doredirect() {
 225          if (myGetAPIHandle() != null) {
 226              location = "<?php echo $result ?>";
 227          }
 228          else {
 229              document.body.innerHTML = "<p><?php echo get_string('activityloading', 'scorm');?>" +
 230                                          "<span id='countdown'><?php echo $delayseconds ?></span> " +
 231                                          "<?php echo get_string('numseconds', 'moodle', '');?>. &nbsp; " +
 232                                          "<img src='<?php echo $OUTPUT->pix_url('wait', 'scorm') ?>'></p>";
 233              var e = document.getElementById("countdown");
 234              var cSeconds = parseInt(e.innerHTML);
 235              var timer = setInterval(function() {
 236                                              if( cSeconds && myGetAPIHandle() == null ) {
 237                                                  e.innerHTML = --cSeconds;
 238                                              } else {
 239                                                  clearInterval(timer);
 240                                                  document.body.innerHTML = "<p><?php echo get_string('activitypleasewait', 'scorm');?></p>";
 241                                                  location = "<?php echo $result ?>";
 242                                              }
 243                                          }, 1000);
 244          }
 245      }
 246      //]]>
 247      </script>
 248      <noscript>
 249          <meta http-equiv="refresh" content="0;url=<?php echo $result ?>" />
 250      </noscript>
 251  <?php
 252  echo html_writer::end_tag('head');
 253  echo html_writer::tag('body', html_writer::tag('p', get_string('activitypleasewait', 'scorm')), array('onload' => "doredirect();"));
 254  echo html_writer::end_tag('html');