course/switchrole.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * The purpose of this file is to allow the user to switch roles and be redirected
  20  * back to the page that they were on.
  21  *
  22  * This functionality is also supported in {@link /course/view.php} in order to comply
  23  * with backwards compatibility
  24  * The reason that we created this file was so that user didn't get redirected back
  25  * to the course view page only to be redirected again.
  26  *
  27  * @since 2.0
  28  * @package course
  29  * @copyright 2009 Sam Hemelryk
  30  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  31  */
  32
  33 require_once('../config.php');
  34 require_once($CFG->dirroot.'/course/lib.php');
  35
  36 $id         = required_param('id', PARAM_INT);
  37 $switchrole = optional_param('switchrole',-1, PARAM_INT);
  38 $returnurl  = optional_param('returnurl', false, PARAM_URL);
  39
  40 $PAGE->set_url('/course/switchrole.php', array('id'=>$id));
  41
  42 if (!confirm_sesskey()) {
  43     print_error('confirmsesskeybad', 'error');
  44 }
  45
  46 if (! ($course = $DB->get_record('course', array('id'=>$id)))) {
  47     print_error('invalidcourseid', 'error');
  48 }
  49
  50 if (!$context = get_context_instance(CONTEXT_COURSE, $course->id)) {
  51     print_error('nocontext');
  52 }
  53
  54 // Remove any switched roles before checking login
  55 if ($switchrole == 0) {
  56     role_switch($switchrole, $context);
  57 }
  58 require_login($course);
  59
  60 // Switchrole - sanity check in cost-order...
  61 if ($switchrole > 0 && has_capability('moodle/role:switchroles', $context)) {
  62     // is this role assignable in this context?
  63     // inquiring minds want to know...
  64     $aroles = get_switchable_roles($context);
  65     if (is_array($aroles) && isset($aroles[$switchrole])) {
  66         role_switch($switchrole, $context);
  67         // Double check that this role is allowed here
  68         require_login($course);
  69     }
  70 }
  71
  72 // TODO: Using SESSION->returnurl is deprecated and should be removed in the future.
  73 // Till then this code remains to support any external applications calling this script.
  74 if (!empty($returnurl) && is_numeric($returnurl)) {
  75     $returnurl = false;
  76     if (!empty($SESSION->returnurl) && strpos($SESSION->returnurl, 'moodle_url')!==false) {
  77         debugging('Code calling switchrole should be passing a URL as a param.', DEBUG_DEVELOPER);
  78         $returnurl = @unserialize($SESSION->returnurl);
  79         if (!($returnurl instanceof moodle_url)) {
  80             $returnurl = false;
  81         }
  82     }
  83 }
  84
  85 if ($returnurl === false) {
  86     $returnurl = new moodle_url('/course/view.php', array('id' => $course->id));
  87 }
  88
  89 redirect($returnurl);