mod/chat/chat_ajax.php

   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 define('AJAX_SCRIPT', true);
  18
  19 require(__DIR__.'/../../config.php');
  20 require_once(__DIR__ . '/lib.php');
  21
  22 $action       = optional_param('action', '', PARAM_ALPHANUM);
  23 $beepid       = optional_param('beep', '', PARAM_RAW);
  24 $chatsid      = required_param('chat_sid', PARAM_ALPHANUM);
  25 $theme        = required_param('chat_theme', PARAM_ALPHANUMEXT);
  26 $chatmessage  = optional_param('chat_message', '', PARAM_RAW);
  27 $chatlasttime = optional_param('chat_lasttime', 0, PARAM_INT);
  28 $chatlastrow  = optional_param('chat_lastrow', 1, PARAM_INT);
  29
  30 if (!confirm_sesskey()) {
  31     throw new moodle_exception('invalidsesskey', 'error');
  32 }
  33
  34 if (!$chatuser = $DB->get_record('chat_users', array('sid' => $chatsid))) {
  35     throw new moodle_exception('notlogged', 'chat');
  36 }
  37 if (!$chat = $DB->get_record('chat', array('id' => $chatuser->chatid))) {
  38     throw new moodle_exception('invaliduserid', 'error');
  39 }
  40 if (!$course = $DB->get_record('course', array('id' => $chat->course))) {
  41     throw new moodle_exception('invalidcourseid', 'error');
  42 }
  43 if (!$cm = get_coursemodule_from_instance('chat', $chat->id, $course->id)) {
  44     throw new moodle_exception('invalidcoursemodule', 'error');
  45 }
  46
  47 if (!isloggedin()) {
  48     throw new moodle_exception('notlogged', 'chat');
  49 }
  50
  51 // Set up $PAGE so that format_text will work properly.
  52 $PAGE->set_cm($cm, $course, $chat);
  53 $PAGE->set_url('/mod/chat/chat_ajax.php', array('chat_sid' => $chatsid));
  54
  55 require_login($course, false, $cm);
  56
  57 $context = context_module::instance($cm->id);
  58 require_capability('mod/chat:chat', $context);
  59
  60 ob_start();
  61 header('Expires: Sun, 28 Dec 1997 09:32:45 GMT');
  62 header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
  63 header('Cache-Control: no-cache, must-revalidate');
  64 header('Pragma: no-cache');
  65 header('Content-Type: text/html; charset=utf-8');
  66
  67 switch ($action) {
  68     case 'init':
  69         $users = chat_get_users($chatuser->chatid, $chatuser->groupid, $cm->groupingid);
  70         $users = chat_format_userlist($users, $course);
  71         $response['users'] = $users;
  72         echo json_encode($response);
  73         break;
  74
  75     case 'chat':
  76         \core\session\manager::write_close();
  77         chat_delete_old_users();
  78         $chatmessage = clean_text($chatmessage, FORMAT_MOODLE);
  79
  80         if (!empty($beepid)) {
  81             $chatmessage = 'beep '.$beepid;
  82         }
  83
  84         if (!empty($chatmessage)) {
  85
  86             chat_send_chatmessage($chatuser, $chatmessage, 0, $cm);
  87
  88             $chatuser->lastmessageping = time() - 2;
  89             $DB->update_record('chat_users', $chatuser);
  90
  91             // Response OK message.
  92             echo json_encode(true);
  93             ob_end_flush();
  94         }
  95         break;
  96
  97     case 'update':
  98         if ((time() - $chatlasttime) > $CFG->chat_old_ping) {
  99             chat_delete_old_users();
 100         }
 101
 102         if ($latestmessage = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
 103             $chatnewlasttime = $latestmessage->timestamp;
 104         } else {
 105             $chatnewlasttime = 0;
 106         }
 107
 108         if ($chatlasttime == 0) {
 109             $chatlasttime = time() - $CFG->chat_old_ping;
 110         }
 111
 112         $messages = chat_get_latest_messages($chatuser, $chatlasttime);
 113
 114         if (!empty($messages)) {
 115             $num = count($messages);
 116         } else {
 117             $num = 0;
 118         }
 119         $chatnewrow = ($chatlastrow + $num) % 2;
 120         $senduserlist = false;
 121         if ($messages && ($chatlasttime != $chatnewlasttime)) {
 122             foreach ($messages as $n => &$message) {
 123                 $tmp = new stdClass();
 124                 // When somebody enter room, user list will be updated.
 125                 if (!empty($message->issystem)) {
 126                     $senduserlist = true;
 127                 }
 128                 if ($html = chat_format_message_theme($message, $chatuser, $USER, $cm->groupingid, $theme)) {
 129                     $message->mymessage = ($USER->id == $message->userid);
 130                     $message->message  = $html->html;
 131                     if (!empty($html->type)) {
 132                         $message->type = $html->type;
 133                     }
 134                 } else {
 135                     unset($messages[$n]);
 136                 }
 137             }
 138         }
 139
 140         if ($senduserlist) {
 141             // Return users when system message arrives.
 142             $users = chat_format_userlist(chat_get_users($chatuser->chatid, $chatuser->groupid, $cm->groupingid), $course);
 143             $response['users'] = $users;
 144         }
 145
 146         $DB->set_field('chat_users', 'lastping', time(), array('id' => $chatuser->id));
 147
 148         $response['lasttime'] = $chatnewlasttime;
 149         $response['lastrow']  = $chatnewrow;
 150         if ($messages) {
 151             $response['msgs'] = $messages;
 152         }
 153
 154         echo json_encode($response);
 155         header('Content-Length: ' . ob_get_length());
 156
 157         ob_end_flush();
 158         break;
 159
 160     default:
 161         break;
 162 }