<?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/>.
/** jsupdated.php - notes by Martin Langhoff <martin@catalyst.net.nz>
**
** This is an alternative version of jsupdate.php that acts
** as a long-running daemon. It will feed/stall/feed JS updates
** to the client. From the module configuration select "Stream"
** updates.
**
** The client connection is not forever though. Once we reach
** CHAT_MAX_CLIENT_UPDATES, it will force the client to re-fetch it.
**
** This buys us all the benefits that chatd has, minus the setup,
** as we are using apache to do the daemon handling.
**
**/
define('CHAT_MAX_CLIENT_UPDATES', 1000);
define('NO_MOODLE_COOKIES', true); // Session not used here.
define('NO_OUTPUT_BUFFERING', true);
require('../../../config.php');
require_once('../lib.php');
// We are going to run for a long time.
// Avoid being terminated by php.
core_php_time_limit::raise();
$chatsid = required_param('chat_sid', PARAM_ALPHANUM);
$chatlasttime = optional_param('chat_lasttime', 0, PARAM_INT);
$chatlastrow = optional_param('chat_lastrow', 1, PARAM_INT);
$chatlastid = optional_param('chat_lastid', 0, PARAM_INT);
$url = new moodle_url('/mod/chat/gui_header_js/jsupdated.php', array('chat_sid' => $chatsid));
if ($chatlasttime !== 0) {
$url->param('chat_lasttime', $chatlasttime);
}
if ($chatlastrow !== 1) {
$url->param('chat_lastrow', $chatlastrow);
}
if ($chatlastid !== 1) {
$url->param('chat_lastid', $chatlastid);
}
$PAGE->set_url($url);
if (!$chatuser = $DB->get_record('chat_users', array('sid' => $chatsid))) {
throw new \moodle_exception('notlogged', 'chat');
}
// Get the minimal course.
if (!$course = $DB->get_record('course', array('id' => $chatuser->course))) {
throw new \moodle_exception('invalidcourseid');
}
// Get the user theme and enough info to be used in chat_format_message() which passes it along to
// chat_format_message_manually() -- and only id and timezone are used.
// No optimisation here, it would break again in future!
if (!$user = $DB->get_record('user', array('id' => $chatuser->userid, 'deleted' => 0, 'suspended' => 0))) {
throw new \moodle_exception('invaliduser');
}
\core\session\manager::set_user($user);
// Setup course, lang and theme.
$PAGE->set_course($course);
// Force deleting of timed out users if there is a silence in room or just entering.
if ((time() - $chatlasttime) > $CFG->chat_old_ping) {
// Must be done before chat_get_latest_message!
chat_delete_old_users();
}
// Time to send headers, and lay out the basic JS updater page.
header('Expires: Sun, 28 Dec 1997 09:32:45 GMT');
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
header('Cache-Control: no-cache, must-revalidate');
header('Pragma: no-cache');
header('Content-Type: text/html; charset=utf-8');
$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?".
"chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script type="text/javascript">
//<![CDATA[
if (parent.msg.document.getElementById("msgStarted") == null) {
parent.msg.document.close();
parent.msg.document.open("text/html","replace");
parent.msg.document.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
parent.msg.document.write("<html><head>");
parent.msg.document.write("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" />");
parent.msg.document.write("<base target=\"_blank\" />");
parent.msg.document.write("</head><body class=\"mod-chat-gui_header_js course-<?php echo $chatuser->course ?>\" id=\"mod-chat-gui_header_js-jsupdate\"><div style=\"display: none\" id=\"msgStarted\"> </div>");
}
//]]>
</script>
</head>
<body>
<?php
// Ensure the HTML head makes it out there.
echo $CHAT_DUMMY_DATA;
for ($n = 0; $n <= CHAT_MAX_CLIENT_UPDATES; $n++) {
// Ping first so we can later shortcut as needed.
$chatuser->lastping = time();
$DB->set_field('chat_users', 'lastping', $chatuser->lastping, array('id' => $chatuser->id));
if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
$chatnewlasttime = $message->timestamp;
$chatnewlastid = $message->id;
} else {
$chatnewlasttime = 0;
$chatnewlastid = 0;
print " \n";
print $CHAT_DUMMY_DATA;
sleep($CFG->chat_refresh_room);
continue;
}
$timenow = time();
$params = array('groupid' => $chatuser->groupid,
'lastid' => $chatlastid,
'lasttime' => $chatlasttime,
'chatid' => $chatuser->chatid);
$groupselect = $chatuser->groupid ? " AND (groupid=:groupid OR groupid=0) " : "";
$newcriteria = '';
if ($chatlastid > 0) {
$newcriteria = "id > :lastid";
} else {
if ($chatlasttime == 0) { // Display some previous messages.
$chatlasttime = $timenow - $CFG->chat_old_ping; // TO DO - any better value?
}
$newcriteria = "timestamp > :lasttime";
}
$messages = $DB->get_records_select("chat_messages_current",
"chatid = :chatid AND $newcriteria $groupselect", $params,
"timestamp ASC");
if ($messages) {
$num = count($messages);
} else {
print " \n";
print $CHAT_DUMMY_DATA;
sleep($CFG->chat_refresh_room);
continue;
}
print '<script type="text/javascript">' . "\n";
print "//<![CDATA[\n\n";
$chatnewrow = ($chatlastrow + $num) % 2;
$refreshusers = false;
$us = array ();
if (($chatlasttime != $chatnewlasttime) and $messages) {
$beep = false;
$refreshusers = false;
foreach ($messages as $message) {
$chatlastrow = ($chatlastrow + 1) % 2;
$formatmessage = chat_format_message($message, $chatuser->course, $USER, $chatlastrow);
if ($formatmessage->beep) {
$beep = true;
}
if ($formatmessage->refreshusers) {
$refreshusers = true;
}
$us[$message->userid] = $timenow - $message->timestamp;
echo "parent.msg.document.write('".addslashes_js($formatmessage->html )."\\n');\n";
}
// From the last message printed.
// A strange case where lack of closures is useful!
$chatlasttime = $message->timestamp;
$chatlastid = $message->id;
}
if ($refreshusers) {
echo "if (parent.users.document.anchors[0] != null) {" .
"parent.users.location.href = parent.users.document.anchors[0].href;}\n";
} else {
foreach ($us as $uid => $lastping) {
$min = (int) ($lastping / 60);
$sec = $lastping - ($min * 60);
$min = $min < 10 ? '0'.$min : $min;
$sec = $sec < 10 ? '0'.$sec : $sec;
$idle = $min.':'.$sec;
echo "if (parent.users.document.getElementById('uidle{$uid}') != null) {".
"parent.users.document.getElementById('uidle{$uid}').innerHTML = '$idle';}\n";
}
}
print <<<EOD
if(parent.input){
var autoscroll = parent.input.document.getElementById('auto');
if(parent.msg && autoscroll && autoscroll.checked){
parent.msg.scroll(1,5000000);
}
}
EOD;
print "//]]>\n";
print '</script>' . "\n\n";
if ($beep) {
print '<script> (function() {';
print 'var audioElement = document.createElement("audio");';
print 'audioElement.setAttribute("src", "../beep.mp3");';
print 'audioElement.play(); })();';
print '</script>';
}
print $CHAT_DUMMY_DATA;
sleep($CFG->chat_refresh_room);
} // Here ends the for() loop.
// Here & should be written & :-D.
$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?";
$refreshurl .= "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
print '<script type="text/javascript">' . "\n";
print "//<![CDATA[ \n\n";
print "location.href = '$refreshurl';\n";
print "//]]>\n";
print '</script>' . "\n\n";
?>
</body>
</html>