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   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  
  26  define('NO_DEBUG_DISPLAY', true);
  27  define('NO_MOODLE_COOKIES', true);
  28  
  29  require_once(__DIR__ . '/../../config.php');
  30  require_once($CFG->dirroot . '/mod/lti/locallib.php');
  31  
  32  
  33  $response = new \mod_lti\local\ltiservice\response();
  34  
  35  $isget = $response->get_request_method() == 'GET';
  36  
  37  if ($isget) {
  38      $response->set_accept(isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : '');
  39  } else {
  40      $response->set_content_type(isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : '');
  41  }
  42  
  43  $ok = false;
  44  $path = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
  45  
  46  $accept = $response->get_accept();
  47  
  48  $services = lti_get_services();
  49  foreach ($services as $service) {
  50      $resources = $service->get_resources();
  51      foreach ($resources as $resource) {
  52          if (($isget && !empty($accept) && (strpos($accept, '*/*') === false) &&
  53               !in_array($accept, $resource->get_formats())) ||
  54              (!$isget && !in_array($response->get_content_type(), $resource->get_formats()))) {
  55              continue;
  56          }
  57          $template = $resource->get_template();
  58          $template = preg_replace('/\{[a-zA-Z_]+\}/', '[^/]+', $template);
  59          $template = preg_replace('/\{\?[0-9a-zA-Z_\-,]+\}$/', '', $template);
  60          $template = str_replace('/', '\/', $template);
  61          if (preg_match("/{$template}/", $path) === 1) {
  62              $ok = true;
  63              break 2;
  64          }
  65      }
  66  }
  67  if (!$ok) {
  68      $response->set_code(400);
  69  } else {
  70      $body = file_get_contents('php://input');
  71      $response->set_request_data($body);
  72      if (in_array($response->get_request_method(), $resource->get_methods())) {
  73          $resource->execute($response);
  74      } else {
  75          $response->set_code(405);
  76      }
  77  }
  78  $response->send();