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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   * The purpose of this file is to allow the user to switch roles and be redirected
  19   * back to the page that they were on.
  20   *
  21   * This functionality is also supported in {@link /course/view.php} in order to comply
  22   * with backwards compatibility.
  23   * The reason that we created this file was so that user didn't get redirected back
  24   * to the course view page only to be redirected again.
  25   *
  26   * @since Moodle 2.0
  27   * @package course
  28   * @copyright 2009 Sam Hemelryk
  29   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  30   */
  31  
  32  require_once('../config.php');
  33  require_once($CFG->dirroot.'/course/lib.php');
  34  
  35  $id         = required_param('id', PARAM_INT);
  36  $switchrole = optional_param('switchrole', -1, PARAM_INT);
  37  $returnurl  = optional_param('returnurl', '', PARAM_RAW);
  38  
  39  if (strpos($returnurl, '?') === false) {
  40      // Looks like somebody did not set proper page url, better go to course page.
  41      $returnurl = new moodle_url('/course/view.php', array('id' => $id));
  42  } else {
  43      if (strpos($returnurl, $CFG->wwwroot) !== 0) {
  44          $returnurl = $CFG->wwwroot.$returnurl;
  45      }
  46      $returnurl  = clean_param($returnurl, PARAM_URL);
  47  }
  48  
  49  $PAGE->set_url('/course/switchrole.php', array('id'=>$id));
  50  
  51  require_sesskey();
  52  
  53  if (!$course = $DB->get_record('course', array('id'=>$id))) {
  54      redirect(new moodle_url('/'));
  55  }
  56  
  57  $context = context_course::instance($course->id);
  58  
  59  // Remove any switched roles before checking login.
  60  if ($switchrole == 0) {
  61      role_switch(0, $context);
  62  }
  63  require_login($course);
  64  
  65  // Switchrole - sanity check in cost-order...
  66  if ($switchrole > 0 && has_capability('moodle/role:switchroles', $context)) {
  67      // Is this role assignable in this context?
  68      // inquiring minds want to know...
  69      $aroles = get_switchable_roles($context);
  70      if (is_array($aroles) && isset($aroles[$switchrole])) {
  71          role_switch($switchrole, $context);
  72      }
  73  }
  74  
  75  redirect($returnurl);