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<?php // $Id: jsupdated.php,v 1.1 2006/04/19 02:20:48 martinlanghoff Exp $
/** 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);
$nomoodlecookie = true; // Session not needed!
require('../../../config.php');
require('../lib.php');
// we are going to run for a long time
// avoid being terminated by php
@set_time_limit(0);
$chat_sid = required_param('chat_sid', PARAM_ALPHANUM);
$chat_lasttime = optional_param('chat_lasttime', 0, PARAM_INT);
$chat_lastrow = optional_param('chat_lastrow', 1, PARAM_INT);
$chat_lastid = optional_param('chat_lastid', 0, PARAM_INT);
if (!$chatuser = get_record('chat_users', 'sid', $chat_sid)) {
error('Not logged in!');
}
//Get the course theme
$course = get_record('course','id',$chatuser->course,'','','','','id,theme');
//Set the course theme if necessary
if (!empty($course->theme)) {
if (!empty($CFG->allowcoursethemes)) {
$CFG->coursetheme = $course->theme;
}
}
//Get the user theme and enough info to be used in chat_format_message() which passes it along to
// chat_format_message_manually() -- and only id and timezone are used.
if (!$USER = get_record('user','id',$chatuser->userid,'','','','','id, theme, username, timezone')) {
error('User does not exist!');
}
$USER->description = '';
//Adjust the prefered theme (main, course, user)
theme_setup();
chat_force_language($chatuser->lang);
// force deleting of timed out users if there is a silence in room or just entering
if ((time() - $chat_lasttime) > $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');
/// required stylesheets
$stylesheetshtml = '';
foreach ($CFG->stylesheets as $stylesheet) {
$stylesheetshtml .= '<link rel=\\"stylesheet\\" type=\\"text/css\\" href=\\"'.$stylesheet.'\\" />';
}
?>
<!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=<?php echo current_charset(); ?>" />
<script type="text/javascript">
<!--
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=<?php echo current_charset(); ?>\" />");
parent.msg.document.write("<base target=\"_blank\" />");
parent.msg.document.write("<?php echo $stylesheetshtml ?>");
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 $CHAT_DUMMY_DATA;
@ob_end_flush();
for ($n=0; $n <= CHAT_MAX_CLIENT_UPDATES; $n++) {
// ping first so we can later shortcut as needed.
$chatuser->lastping = time();
set_field('chat_users', 'lastping', $chatuser->lastping, 'id', $chatuser->id );
if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
$chat_newlasttime = $message->timestamp;
$chat_newlastid = $message->id;
} else {
$chat_newlasttime = 0;
$chat_newlastid = 0;
print " \n";
print $CHAT_DUMMY_DATA;
@ob_end_flush();
sleep($CFG->chat_refresh_room);
continue;
}
$timenow = time();
$groupselect = $chatuser->groupid ? " AND (groupid='".$chatuser->groupid."' OR groupid='0') " : "";
$newcriteria = '';
if ($chat_lastid > 0) {
$newcriteria = "id > $chat_lastid";
} else {
if ($chat_lasttime == 0) { //display some previous messages
$chat_lasttime = $timenow - $CFG->chat_old_ping; //TO DO - any better value??
}
$newcriteria = "timestamp > $chat_lasttime";
}
$messages = get_records_select("chat_messages",
"chatid = '$chatuser->chatid' AND $newcriteria $groupselect",
"timestamp ASC");
if ($messages) {
$num = count($messages);
} else {
print " \n";
print $CHAT_DUMMY_DATA;
@ob_end_flush();
sleep($CFG->chat_refresh_room);
continue;
$num = 0;
}
print '<script type="text/javascript">' . "\n";
print "<!-- \n\n";
$chat_newrow = ($chat_lastrow + $num) % 2;
$refreshusers = false;
$us = array ();
if (($chat_lasttime != $chat_newlasttime) and $messages) {
$beep = false;
$refreshusers = false;
foreach ($messages as $message) {
$chat_lastrow = ($chat_lastrow + 1) % 2;
$formatmessage = chat_format_message($message, $chatuser->course, $USER, $chat_lastrow);
if ($formatmessage->beep) {
$beep = true;
}
if ($formatmessage->refreshusers) {
$refreshusers = true;
}
$us[$message->userid] = $timenow - $message->timestamp;
echo "parent.msg.document.write('".addslashes($formatmessage->html )."\\n');\n";
}
// from the last message printed...
// a strange case where lack of closures is useful!
$chat_lasttime = $message->timestamp;
$chat_lastid = $message->id;
}
if ($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 = '$idle';}\n";
}
}
print 'parent.msg.scroll(1,5000000);' . "\n\n";
print "// -->\n";
print '</script>' . "\n\n";
if ($beep) {
print '<embed src="../beep.wav" autostart="true" hidden="true" name="beep" />';
}
print $CHAT_DUMMY_DATA;
@ob_end_flush();
sleep($CFG->chat_refresh_room);
} // here ends the for() loop
// here & should be written & :-D
$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?chat_sid=$chat_sid&chat_lasttime=$chat_lasttime&chat_lastrow=$chat_newrow&chat_lastid=$chat_lastid";
print '<script type="text/javascript">' . "\n";
print "<!-- \n\n";
print "location.href = '$refreshurl';\n";
print "// -->\n";
print '</script>' . "\n\n";
?>
</body>
</html>
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