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 * This file contains a controller for receiving LTI service requests
19 *
20 * @package    mod_lti
21 * @copyright  2014 Vital Source Technologies http://vitalsource.com
22 * @author     Stephen Vickers
23 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
24 */
25
26define('NO_DEBUG_DISPLAY', true);
27define('NO_MOODLE_COOKIES', true);
28
29require_once(__DIR__ . '/../../config.php');
30require_once($CFG->dirroot . '/mod/lti/locallib.php');
31
32
33$response = new \mod_lti\local\ltiservice\response();
34
35$isget = $response->get_request_method() === mod_lti\local\ltiservice\resource_base::HTTP_GET;
36$isdelete = $response->get_request_method() === mod_lti\local\ltiservice\resource_base::HTTP_DELETE;
37
38if ($isget) {
39    $response->set_accept(isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : '');
40} else {
41    $response->set_content_type(isset($_SERVER['CONTENT_TYPE']) ? explode(';', $_SERVER['CONTENT_TYPE'], 2)[0] : '');
42}
43
44$ok = false;
45$path = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
46
47$accept = $response->get_accept();
48$contenttype = $response->get_content_type();
49
50$services = lti_get_services();
51foreach ($services as $service) {
52    $resources = $service->get_resources();
53    foreach ($resources as $resource) {
54        if (($isget && !empty($accept) && (strpos($accept, '*/*') === false) &&
55             !in_array($accept, $resource->get_formats())) ||
56            ((!$isget && !$isdelete) && !in_array($contenttype, $resource->get_formats()))) {
57            continue;
58        }
59        $template = $resource->get_template();
60        $template = preg_replace('/{config_type}/', '(toolproxy|tool)', $template);
61        $template = preg_replace('/\{[a-zA-Z_]+\}/', '[^/]+', $template);
62        $template = preg_replace('/\(([0-9a-zA-Z_\-,\/]+)\)/', '(\\1|)', $template);
63        $template = str_replace('/', '\/', $template);
64        if (preg_match("/^{$template}$/", $path) === 1) {
65            $ok = true;
66            break 2;
67        }
68    }
69}
70if (!$ok) {
71    $response->set_code(400);
72    $response->set_reason("No handler found for {$path} {$accept} {$contenttype}");
73} else {
74    $body = file_get_contents('php://input');
75    $response->set_request_data($body);
76    if (in_array($response->get_request_method(), $resource->get_methods())) {
77        $resource->execute($response);
78    } else {
79        $response->set_code(405);
80    }
81}
82$response->send();
83