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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This file contains a class definition for the Context Memberships resource
*
* @package ltiservice_memberships
* @copyright 2015 Vital Source Technologies http://vitalsource.com
* @author Stephen Vickers
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace ltiservice_memberships\local\resources;
use mod_lti\local\ltiservice\resource_base;
use ltiservice_memberships\local\service\memberships;
use core_availability\info_module;
defined('MOODLE_INTERNAL') || die();
/**
* A resource implementing Context Memberships.
*
* @package ltiservice_memberships
* @since Moodle 3.0
* @copyright 2015 Vital Source Technologies http://vitalsource.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class contextmemberships extends resource_base {
/**
* Class constructor.
*
* @param \ltiservice_memberships\local\service\memberships $service Service instance
*/
public function __construct($service) {
parent::__construct($service);
$this->id = 'ToolProxyBindingMemberships';
$this->template = '/{context_type}/{context_id}/bindings/{tool_code}/memberships';
$this->variables[] = 'ToolProxyBinding.memberships.url';
$this->formats[] = 'application/vnd.ims.lis.v2.membershipcontainer+json';
$this->formats[] = 'application/vnd.ims.lti-nrps.v2.membershipcontainer+json';
$this->methods[] = self::HTTP_GET;
}
/**
* Execute the request for this resource.
*
* @param \mod_lti\local\ltiservice\response $response Response object for this request.
*/
public function execute($response) {
global $DB;
$params = $this->parse_template();
$role = optional_param('role', '', PARAM_TEXT);
$limitnum = optional_param('limit', 0, PARAM_INT);
$limitfrom = optional_param('from', 0, PARAM_INT);
$linkid = optional_param('rlid', '', PARAM_TEXT);
$lti = null;
$modinfo = null;
if ($limitnum <= 0) {
$limitfrom = 0;
}
try {
if (!$this->check_tool($params['tool_code'], $response->get_request_data(),
array(memberships::SCOPE_MEMBERSHIPS_READ))) {
throw new \Exception(null, 401);
}
if (!($course = $DB->get_record('course', array('id' => $params['context_id']), 'id,shortname,fullname',
IGNORE_MISSING))) {
throw new \Exception("Not Found: Course {$params['context_id']} doesn't exist", 404);
}
if (!$this->get_service()->is_allowed_in_context($params['tool_code'], $course->id)) {
throw new \Exception(null, 404);
}
if (!($context = \context_course::instance($course->id))) {
throw new \Exception("Not Found: Course instance {$course->id} doesn't exist", 404);
}
if (!empty($linkid)) {
if (!($lti = $DB->get_record('lti', array('id' => $linkid), 'id,course,typeid,servicesalt', IGNORE_MISSING))) {
throw new \Exception("Not Found: LTI link {$linkid} doesn't exist", 404);
}
$modinfo = get_fast_modinfo($course);
$cm = get_coursemodule_from_instance('lti', $linkid, $lti->course, false, MUST_EXIST);
$cm = $modinfo->get_cm($cm->id);
$modinfo = new info_module($cm);
if ($modinfo->is_available_for_all()) {
$modinfo = null;
}
}
$json = $this->get_service()->get_members_json($this, $context, $course, $role, $limitfrom, $limitnum, $lti,
$modinfo, $response);
$response->set_body($json);
} catch (\Exception $e) {
$response->set_code($e->getCode());
$response->set_reason($e->getMessage());
}
}
/**
* Parse a value for custom parameter substitution variables.
*
* @param string $value String to be parsed
*
* @return string
*/
public function parse_value($value) {
global $COURSE, $DB;
if (strpos($value, '$ToolProxyBinding.memberships.url') !== false) {
if ($COURSE->id === SITEID) {
$this->params['context_type'] = 'Group';
} else {
$this->params['context_type'] = 'CourseSection';
}
$this->params['context_id'] = $COURSE->id;
if ($tool = $this->get_service()->get_type()) {
$this->params['tool_code'] = $tool->id;
}
$value = str_replace('$ToolProxyBinding.memberships.url', parent::get_endpoint(), $value);
}
return $value;
}
}