/**
* Returns a little popup menu for switching roles
*
* @uses $CFG
* @uses $USER
* @param int $courseid The course to update by id as found in 'course' table
* @return string
*/
function switchroles_form($courseid)
{
global $CFG, $USER;
if (!($context = get_context_instance(CONTEXT_COURSE, $courseid))) {
return '';
}
if (!empty($USER->access['rsw'][$context->path])) {
// Just a button to return to normal
$options = array();
$options['id'] = $courseid;
$options['sesskey'] = sesskey();
$options['switchrole'] = 0;
return print_single_button($CFG->wwwroot . '/course/view.php', $options, get_string('switchrolereturn'), 'post', '_self', true);
}
if (has_capability('moodle/role:switchroles', $context)) {
if (!($roles = get_assignable_roles_for_switchrole($context))) {
return '';
// Nothing to show!
}
// unset default user role - it would not work
unset($roles[$CFG->guestroleid]);
return popup_form($CFG->wwwroot . '/course/view.php?id=' . $courseid . '&sesskey=' . sesskey() . '&switchrole=', $roles, 'switchrole', '', get_string('switchroleto'), 'switchrole', get_string('switchroleto'), true);
}
return '';
}
}
preload_course_contexts($course->id);
if (!($context = get_context_instance(CONTEXT_COURSE, $course->id))) {
print_error('nocontext');
}
// Remove any switched roles before checking login
if ($switchrole == 0 && confirm_sesskey()) {
role_switch($switchrole, $context);
}
require_login($course);
// Switchrole - sanity check in cost-order...
$reset_user_allowed_editing = false;
if ($switchrole > 0 && confirm_sesskey() && has_capability('moodle/role:switchroles', $context)) {
// is this role assignable in this context?
// inquiring minds want to know...
$aroles = get_assignable_roles_for_switchrole($context);
if (is_array($aroles) && isset($aroles[$switchrole])) {
role_switch($switchrole, $context);
// Double check that this role is allowed here
require_login($course->id);
}
// reset course page state - this prevents some weird problems ;-)
$USER->activitycopy = false;
$USER->activitycopycourse = NULL;
unset($USER->activitycopyname);
unset($SESSION->modform);
$USER->editing = 0;
$reset_user_allowed_editing = true;
}
//If course is hosted on an external server, redirect to corresponding
//url with appropriate authentication attached as parameter
