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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  /**
  18   * Handle sending a user to a tool provider to initiate a content-item selection.
  19   *
  20   * @package mod_lti
  21   * @copyright  2015 Vital Source Technologies http://vitalsource.com
  22   * @author     Stephen Vickers
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  require_once('../../config.php');
  27  require_once($CFG->dirroot . '/mod/lti/lib.php');
  28  require_once($CFG->dirroot . '/mod/lti/locallib.php');
  29  
  30  $id = required_param('id', PARAM_INT);
  31  $courseid = required_param('course', PARAM_INT);
  32  $title = optional_param('title', '', PARAM_TEXT);
  33  $text = optional_param('text', '', PARAM_RAW);
  34  
  35  $config = lti_get_type_type_config($id);
  36  if ($config->lti_ltiversion === LTI_VERSION_1P3) {
  37      if (!isset($SESSION->lti_initiatelogin_status)) {
  38          echo lti_initiate_login($courseid, 0, null, $config, 'ContentItemSelectionRequest', $title, $text);
  39          exit;
  40      } else {
  41          unset($SESSION->lti_initiatelogin_status);
  42      }
  43  }
  44  
  45  // Check access and capabilities.
  46  $course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
  47  require_login($course);
  48  $context = context_course::instance($courseid);
  49  require_capability('moodle/course:manageactivities', $context);
  50  require_capability('mod/lti:addcoursetool', $context);
  51  
  52  // Set the return URL. We send the launch container along to help us avoid frames-within-frames when the user returns.
  53  $returnurlparams = [
  54      'course' => $course->id,
  55      'id' => $id,
  56      'sesskey' => sesskey()
  57  ];
  58  $returnurl = new \moodle_url('/mod/lti/contentitem_return.php', $returnurlparams);
  59  
  60  // Prepare the request.
  61  $request = lti_build_content_item_selection_request($id, $course, $returnurl, $title, $text, [], []);
  62  
  63  // Get the launch HTML.
  64  $content = lti_post_launch_html($request->params, $request->url, false);
  65  
  66  echo $content;