course/switchrole.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 /**
  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 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);