jsupdated.php
来自「很棒的在线教学系统」· PHP 代码 · 共 234 行
PHP
234 行
<?php // $Id: jsupdated.php,v 1.8.2.2 2008/10/14 08:38:26 dongsheng 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', $chat_sid)) { error('Not logged in!'); } //Get the minimal course if (!$course = get_record('course','id',$chatuser->course,'','','','','id,theme,lang')) { error('incorrect course id'); } //Get the user theme and enough info to be used in chat_format_message() which passes it along to // chat_format_message_manually() -- and only id and timezone are used. if (!$USER = get_record('user','id',$chatuser->userid)) { // no optimisation here, it would break again in future! error('User does not exist!'); } $USER->description = ''; //Setup course, lang and theme course_setup($course); // 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; charset=utf-8'); /// 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=utf-8" /> <script type="text/javascript"> //<![CDATA[ function safari_refresh() { self.location.href= '<?php echo $refreshurl;?>'; } var issafari = false; if(window.devicePixelRatio){ issafari = true; setTimeout('safari_refresh()', <?php echo $CFG->chat_refresh_room*1000;?>); } if (parent.msg.document.getElementById("msgStarted") == null) { parent.msg.document.close(); parent.msg.document.open("text/html","replace"); parent.msg.document.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">"); parent.msg.document.write("<html><head>"); parent.msg.document.write("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" />"); parent.msg.document.write("<base target=\"_blank\" />"); parent.msg.document.write("<?php echo addslashes_js($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 "//<![CDATA[\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 - $message->timestamp; echo "parent.msg.document.write('".addslashes_js($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 = '$idle';}\n"; } } print <<<EOD if(parent.input){ var autoscroll = parent.input.document.getElementById('auto'); if(parent.msg && autoscroll && autoscroll.checked){ parent.msg.scroll(1,5000000); } }EOD; print "//]]>\n"; print '</script>' . "\n\n"; if ($beep) { print '<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 "//<![CDATA[ \n\n"; print "location.href = '$refreshurl';\n"; print "//]]>\n"; print '</script>' . "\n\n";?> </body></html>⌨️ 快捷键说明
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