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efrain |
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/** jsupdated.php - notes by Martin Langhoff <martin@catalyst.net.nz>
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**
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** This is an alternative version of jsupdate.php that acts
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** as a long-running daemon. It will feed/stall/feed JS updates
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** to the client. From the module configuration select "Stream"
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** updates.
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**
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** The client connection is not forever though. Once we reach
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** CHAT_MAX_CLIENT_UPDATES, it will force the client to re-fetch it.
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**
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** This buys us all the benefits that chatd has, minus the setup,
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** as we are using apache to do the daemon handling.
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**
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**/
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define('CHAT_MAX_CLIENT_UPDATES', 1000);
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define('NO_MOODLE_COOKIES', true); // Session not used here.
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define('NO_OUTPUT_BUFFERING', true);
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require('../../../config.php');
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require_once('../lib.php');
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// We are going to run for a long time.
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// Avoid being terminated by php.
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core_php_time_limit::raise();
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$chatsid = required_param('chat_sid', PARAM_ALPHANUM);
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$chatlasttime = optional_param('chat_lasttime', 0, PARAM_INT);
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$chatlastrow = optional_param('chat_lastrow', 1, PARAM_INT);
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$chatlastid = optional_param('chat_lastid', 0, PARAM_INT);
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$url = new moodle_url('/mod/chat/gui_header_js/jsupdated.php', array('chat_sid' => $chatsid));
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if ($chatlasttime !== 0) {
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$url->param('chat_lasttime', $chatlasttime);
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}
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if ($chatlastrow !== 1) {
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$url->param('chat_lastrow', $chatlastrow);
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}
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if ($chatlastid !== 1) {
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$url->param('chat_lastid', $chatlastid);
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}
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$PAGE->set_url($url);
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if (!$chatuser = $DB->get_record('chat_users', array('sid' => $chatsid))) {
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throw new \moodle_exception('notlogged', 'chat');
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}
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// Get the minimal course.
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if (!$course = $DB->get_record('course', array('id' => $chatuser->course))) {
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throw new \moodle_exception('invalidcourseid');
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}
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// Get the user theme and enough info to be used in chat_format_message() which passes it along to
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// chat_format_message_manually() -- and only id and timezone are used.
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// No optimisation here, it would break again in future!
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if (!$user = $DB->get_record('user', array('id' => $chatuser->userid, 'deleted' => 0, 'suspended' => 0))) {
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throw new \moodle_exception('invaliduser');
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}
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\core\session\manager::set_user($user);
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// Setup course, lang and theme.
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$PAGE->set_course($course);
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// Force deleting of timed out users if there is a silence in room or just entering.
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if ((time() - $chatlasttime) > $CFG->chat_old_ping) {
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// Must be done before chat_get_latest_message!
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chat_delete_old_users();
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}
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// Time to send headers, and lay out the basic JS updater page.
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header('Expires: Sun, 28 Dec 1997 09:32:45 GMT');
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header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
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header('Cache-Control: no-cache, must-revalidate');
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header('Pragma: no-cache');
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header('Content-Type: text/html; charset=utf-8');
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$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?".
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"chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
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?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<script type="text/javascript">
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//<![CDATA[
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if (parent.msg.document.getElementById("msgStarted") == null) {
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parent.msg.document.close();
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parent.msg.document.open("text/html","replace");
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parent.msg.document.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
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parent.msg.document.write("<html><head>");
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parent.msg.document.write("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" />");
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parent.msg.document.write("<base target=\"_blank\" />");
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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>");
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}
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//]]>
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</script>
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</head>
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<body>
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<?php
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// Ensure the HTML head makes it out there.
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echo $CHAT_DUMMY_DATA;
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for ($n = 0; $n <= CHAT_MAX_CLIENT_UPDATES; $n++) {
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// Ping first so we can later shortcut as needed.
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$chatuser->lastping = time();
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$DB->set_field('chat_users', 'lastping', $chatuser->lastping, array('id' => $chatuser->id));
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if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
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$chatnewlasttime = $message->timestamp;
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$chatnewlastid = $message->id;
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} else {
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$chatnewlasttime = 0;
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$chatnewlastid = 0;
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print " \n";
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print $CHAT_DUMMY_DATA;
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sleep($CFG->chat_refresh_room);
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continue;
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}
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$timenow = time();
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$params = array('groupid' => $chatuser->groupid,
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'lastid' => $chatlastid,
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'lasttime' => $chatlasttime,
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'chatid' => $chatuser->chatid);
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$groupselect = $chatuser->groupid ? " AND (groupid=:groupid OR groupid=0) " : "";
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$newcriteria = '';
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if ($chatlastid > 0) {
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$newcriteria = "id > :lastid";
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} else {
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if ($chatlasttime == 0) { // Display some previous messages.
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$chatlasttime = $timenow - $CFG->chat_old_ping; // TO DO - any better value?
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}
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$newcriteria = "timestamp > :lasttime";
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}
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$messages = $DB->get_records_select("chat_messages_current",
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"chatid = :chatid AND $newcriteria $groupselect", $params,
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"timestamp ASC");
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if ($messages) {
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$num = count($messages);
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} else {
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print " \n";
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print $CHAT_DUMMY_DATA;
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sleep($CFG->chat_refresh_room);
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continue;
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}
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print '<script type="text/javascript">' . "\n";
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print "//<![CDATA[\n\n";
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$chatnewrow = ($chatlastrow + $num) % 2;
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$refreshusers = false;
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$us = array ();
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if (($chatlasttime != $chatnewlasttime) and $messages) {
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$beep = false;
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$refreshusers = false;
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foreach ($messages as $message) {
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$chatlastrow = ($chatlastrow + 1) % 2;
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$formatmessage = chat_format_message($message, $chatuser->course, $USER, $chatlastrow);
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if ($formatmessage->beep) {
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$beep = true;
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}
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if ($formatmessage->refreshusers) {
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$refreshusers = true;
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}
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$us[$message->userid] = $timenow - $message->timestamp;
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echo "parent.msg.document.write('".addslashes_js($formatmessage->html )."\\n');\n";
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}
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// From the last message printed.
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// A strange case where lack of closures is useful!
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$chatlasttime = $message->timestamp;
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$chatlastid = $message->id;
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}
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if ($refreshusers) {
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echo "if (parent.users.document.anchors[0] != null) {" .
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"parent.users.location.href = parent.users.document.anchors[0].href;}\n";
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} else {
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foreach ($us as $uid => $lastping) {
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$min = (int) ($lastping / 60);
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$sec = $lastping - ($min * 60);
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$min = $min < 10 ? '0'.$min : $min;
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$sec = $sec < 10 ? '0'.$sec : $sec;
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$idle = $min.':'.$sec;
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echo "if (parent.users.document.getElementById('uidle{$uid}') != null) {".
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"parent.users.document.getElementById('uidle{$uid}').innerHTML = '$idle';}\n";
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}
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}
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print <<<EOD
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if(parent.input){
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var autoscroll = parent.input.document.getElementById('auto');
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if(parent.msg && autoscroll && autoscroll.checked){
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parent.msg.scroll(1,5000000);
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}
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}
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EOD;
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print "//]]>\n";
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print '</script>' . "\n\n";
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if ($beep) {
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print '<script> (function() {';
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print 'var audioElement = document.createElement("audio");';
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print 'audioElement.setAttribute("src", "../beep.mp3");';
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print 'audioElement.play(); })();';
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print '</script>';
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}
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print $CHAT_DUMMY_DATA;
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sleep($CFG->chat_refresh_room);
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} // Here ends the for() loop.
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// Here & should be written & :-D.
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$refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?";
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$refreshurl .= "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
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print '<script type="text/javascript">' . "\n";
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print "//<![CDATA[ \n\n";
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print "location.href = '$refreshurl';\n";
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print "//]]>\n";
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print '</script>' . "\n\n";
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?>
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</body>
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</html>
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