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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   * Ajax point of entry for messaging API.
  19   *
  20   * @package    core_message
  21   * @copyright  2015 Frédéric Massart - FMCorz.net
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  define('AJAX_SCRIPT', true);
  26  
  27  require('../config.php');
  28  require_once($CFG->libdir . '/filelib.php');
  29  require_once (__DIR__ . '/lib.php');
  30  
  31  // Only real logged in users.
  32  require_login(null, false, null, true, true);
  33  if (isguestuser()) {
  34      throw new require_login_exception('Guests are not allowed here.');
  35  }
  36  
  37  // Messaging needs to be enabled.
  38  if (empty($CFG->messaging)) {
  39      throw new moodle_exception('disabled', 'core_message');
  40  }
  41  
  42  $PAGE->set_context(null);
  43  require_sesskey();
  44  $action = optional_param('action', null, PARAM_ALPHA);
  45  $response = null;
  46  
  47  switch ($action) {
  48  
  49      // Sending a message.
  50      case 'sendmessage':
  51  
  52          $userid = required_param('userid', PARAM_INT);
  53          if (empty($userid) || isguestuser($userid) || $userid == $USER->id) {
  54              // Cannot send messags to self, nobody or a guest.
  55              throw new coding_exception('Invalid user to send the message to');
  56          }
  57  
  58          $message = required_param('message', PARAM_RAW);
  59          $user2 = core_user::get_user($userid);
  60  
  61          // Only attempt to send the message if we have permission to message
  62          // the recipient.
  63          if (message_can_post_message($user2, $USER)) {
  64              $messageid = message_post_message($USER, $user2, $message, FORMAT_MOODLE);
  65  
  66              if (!$messageid) {
  67                  throw new moodle_exception('errorwhilesendingmessage', 'core_message');
  68              }
  69          } else {
  70              throw new moodle_exception('unabletomessageuser', 'core_message');
  71          }
  72  
  73          $response = array();
  74          break;
  75  }
  76  
  77  if ($response !== null) {
  78      echo json_encode($response);
  79      exit();
  80  }
  81  
  82  throw new coding_exception('Invalid request');