mod/chat/gui_header_js/jsupdate.php

   1 <?php  // $Id$
   2
   3     $nomoodlecookie = true;     // Session not needed!
   4
   5     require('../../../config.php');
   6     require('../lib.php');
   7
   8     $chat_sid      = required_param('chat_sid', PARAM_ALPHANUM);
   9     $chat_lasttime = optional_param('chat_lasttime', 0, PARAM_INT);
  10     $chat_lastrow  = optional_param('chat_lastrow', 1, PARAM_INT);
  11
  12     if (!$chatuser = get_record('chat_users', 'sid', $chat_sid)) {
  13         error('Not logged in!');
  14     }
  15
  16     //Get the minimal course
  17     if (!$course = get_record('course','id',$chatuser->course,'','','','','id,theme,lang')) {
  18         error('incorrect course id');
  19     }
  20
  21     //Get the user theme and enough info to be used in chat_format_message() which passes it along to
  22     if (!$USER = get_record('user','id',$chatuser->userid,'','','','','id, lang, theme, username, timezone')) {
  23         error('User does not exist!');
  24     }
  25     $USER->description = '';
  26
  27     //Setup course, lang and theme
  28     course_setup($course);
  29
  30     // force deleting of timed out users if there is a silence in room or just entering
  31     if ((time() - $chat_lasttime) > $CFG->chat_old_ping) {
  32         // must be done before chat_get_latest_message!!!
  33         chat_delete_old_users();
  34     }
  35
  36     if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
  37         $chat_newlasttime = $message->timestamp;
  38     } else {
  39         $chat_newlasttime = 0;
  40     }
  41
  42     if ($chat_lasttime == 0) { //display some previous messages
  43         $chat_lasttime = time() - $CFG->chat_old_ping; //TO DO - any better value??
  44     }
  45
  46     $timenow    = time();
  47
  48     $groupselect = $chatuser->groupid ? " AND (groupid='".$chatuser->groupid."' OR groupid='0') " : "";
  49
  50     $messages = get_records_select("chat_messages",
  51                         "chatid = '$chatuser->chatid' AND timestamp > '$chat_lasttime' $groupselect",
  52                         "timestamp ASC");
  53
  54     if ($messages) {
  55         $num = count($messages);
  56     } else {
  57         $num = 0;
  58     }
  59
  60     $chat_newrow = ($chat_lastrow + $num) % 2;
  61
  62     // no &amp; in url, does not work in header!
  63     $refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdate.php?chat_sid=$chat_sid&chat_lasttime=$chat_newlasttime&chat_lastrow=$chat_newrow";
  64     $refreshurlamp = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdate.php?chat_sid=$chat_sid&amp;chat_lasttime=$chat_newlasttime&amp;chat_lastrow=$chat_newrow";
  65
  66     header('Expires: Sun, 28 Dec 1997 09:32:45 GMT');
  67     header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
  68     header('Cache-Control: no-cache, must-revalidate');
  69     header('Pragma: no-cache');
  70     header('Content-Type: text/html; charset=utf-8');
  71     header("Refresh: $CFG->chat_refresh_room; url=$refreshurl");
  72
  73     /// required stylesheets
  74     $stylesheetshtml = '';
  75     foreach ($CFG->stylesheets as $stylesheet) {
  76         $stylesheetshtml .= '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'" />';
  77     }
  78
  79     // use ob to be able to send Content-Length headers
  80     // needed for Keep-Alive to work
  81     ob_start();
  82
  83 ?>
  84 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  85 <html>
  86     <head>
  87         <title> </title>
  88         <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  89         <script type="text/javascript">
  90         //<![CDATA[
  91         if (parent.msg.document.getElementById("msgStarted") == null) {
  92             parent.msg.document.close();
  93             parent.msg.document.open("text/html","replace");
  94             parent.msg.document.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
  95             parent.msg.document.write("<html><head>");
  96             parent.msg.document.write("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" />");
  97             parent.msg.document.write("<base target=\"_blank\" />");
  98             parent.msg.document.write("<?php echo addslashes_js($stylesheetshtml) ?>");
  99             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\">&nbsp;<\/div>");
 100         }
 101         <?php
 102         $beep = false;
 103         $refreshusers = false;
 104         $us = array ();
 105         if (($chat_lasttime != $chat_newlasttime) and $messages) {
 106
 107             foreach ($messages as $message) {
 108                 $chat_lastrow = ($chat_lastrow + 1) % 2;
 109                 $formatmessage = chat_format_message($message, $chatuser->course, $USER, $chat_lastrow);
 110                 if ($formatmessage->beep) {
 111                      $beep = true;
 112                 }
 113                 if ($formatmessage->refreshusers) {
 114                      $refreshusers = true;
 115                 }
 116                 $us[$message->userid] = $timenow - $message->timestamp;
 117                 echo "parent.msg.document.write('".addslashes_js($formatmessage->html)."\\n');\n";
 118              }
 119         }
 120
 121         $chatuser->lastping = time();
 122         set_field('chat_users', 'lastping', $chatuser->lastping, 'id', $chatuser->id  );
 123
 124         if ($refreshusers) {
 125             echo "if (parent.users.document.anchors[0] != null) {" .
 126                     "parent.users.location.href = parent.users.document.anchors[0].href;}\n";
 127         } else {
 128             foreach($us as $uid=>$lastping) {
 129                 $min = (int) ($lastping/60);
 130                 $sec = $lastping - ($min*60);
 131                 $min = $min < 10 ? '0'.$min : $min;
 132                 $sec = $sec < 10 ? '0'.$sec : $sec;
 133                 $idle = $min.':'.$sec;
 134                 echo "if (parent.users.document.getElementById('uidle{$uid}') != null) {".
 135                         "parent.users.document.getElementById('uidle{$uid}').innerHTML = '$idle';}\n";
 136             }
 137         }
 138         ?>
 139         parent.msg.scroll(1,5000000);
 140         //]]>
 141         </script>
 142     </head>
 143     <body>
 144        <?php
 145             if ($beep) {
 146                 echo '<embed src="../beep.wav" autostart="true" hidden="true" name="beep" />';
 147             }
 148         ?>
 149        <a href="<?php echo $refreshurlamp ?>" name="refreshLink">Refresh link</a>
 150     </body>
 151 </html>
 152 <?php
 153
 154 // support HTTP Keep-Alive
 155 header("Content-Length: " . ob_get_length() );
 156 ob_end_flush();
 157 exit;
 158
 159
 160 ?>