Current Path : C:/xampp/htdocs/moodle/mod/chat/gui_header_js/ |
Current File : C:/xampp/htdocs/moodle/mod/chat/gui_header_js/jsupdated.php |
<?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('../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' => $chatsid))) { print_error('notlogged', 'chat'); } // Get the minimal course. if (!$course = $DB->get_record('course', array('id' => $chatuser->course))) { print_error('invalidcourseid'); } // Get the user theme and enough info to be used in chat_format_message() which passes it along to // chat_format_message_manually() -- and only id and timezone are used. // No optimisation here, it would break again in future! if (!$user = $DB->get_record('user', array('id' => $chatuser->userid, 'deleted' => 0, 'suspended' => 0))) { print_error('invaliduser'); } \core\session\manager::set_user($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>