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<?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 = '$idle';}\n";}}print <<<EODif(parent.input){var autoscroll = parent.input.document.getElementById('auto');if(parent.msg && autoscroll && autoscroll.checked){parent.msg.scroll(1,5000000);}}EOD;print "//]]>\n";print '</script>' . "\n\n";if ($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>