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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /** jsupdated.php - notes by Martin Langhoff <[email protected]>
  18   **
  19   ** This is an alternative version of jsupdate.php that acts
  20   ** as a long-running daemon. It will feed/stall/feed JS updates
  21   ** to the client. From the module configuration select "Stream"
  22   ** updates.
  23   **
  24   ** The client connection is not forever though. Once we reach
  25   ** CHAT_MAX_CLIENT_UPDATES, it will force the client to re-fetch it.
  26   **
  27   ** This buys us all the benefits that chatd has, minus the setup,
  28   ** as we are using apache to do the daemon handling.
  29   **
  30   **/
  31  
  32  define('CHAT_MAX_CLIENT_UPDATES', 1000);
  33  define('NO_MOODLE_COOKIES', true); // Session not used here.
  34  define('NO_OUTPUT_BUFFERING', true);
  35  
  36  require('../../../config.php');
  37  require ('../lib.php');
  38  
  39  // We are going to run for a long time.
  40  // Avoid being terminated by php.
  41  core_php_time_limit::raise();
  42  
  43  $chatsid      = required_param('chat_sid',          PARAM_ALPHANUM);
  44  $chatlasttime = optional_param('chat_lasttime',  0, PARAM_INT);
  45  $chatlastrow  = optional_param('chat_lastrow',   1, PARAM_INT);
  46  $chatlastid   = optional_param('chat_lastid',    0, PARAM_INT);
  47  
  48  $url = new moodle_url('/mod/chat/gui_header_js/jsupdated.php', array('chat_sid' => $chatsid));
  49  if ($chatlasttime !== 0) {
  50      $url->param('chat_lasttime', $chatlasttime);
  51  }
  52  if ($chatlastrow !== 1) {
  53      $url->param('chat_lastrow', $chatlastrow);
  54  }
  55  if ($chatlastid !== 1) {
  56      $url->param('chat_lastid', $chatlastid);
  57  }
  58  $PAGE->set_url($url);
  59  
  60  if (!$chatuser = $DB->get_record('chat_users', array('sid' => $chatsid))) {
  61      print_error('notlogged', 'chat');
  62  }
  63  
  64  // Get the minimal course.
  65  if (!$course = $DB->get_record('course', array('id' => $chatuser->course))) {
  66      print_error('invalidcourseid');
  67  }
  68  
  69  // Get the user theme and enough info to be used in chat_format_message() which passes it along to
  70  // chat_format_message_manually() -- and only id and timezone are used.
  71  // No optimisation here, it would break again in future!
  72  if (!$user = $DB->get_record('user', array('id' => $chatuser->userid, 'deleted' => 0, 'suspended' => 0))) {
  73      print_error('invaliduser');
  74  }
  75  \core\session\manager::set_user($user);
  76  
  77  // Setup course, lang and theme.
  78  $PAGE->set_course($course);
  79  
  80  // Force deleting of timed out users if there is a silence in room or just entering.
  81  if ((time() - $chatlasttime) > $CFG->chat_old_ping) {
  82      // Must be done before chat_get_latest_message!
  83      chat_delete_old_users();
  84  }
  85  
  86  // Time to send headers, and lay out the basic JS updater page.
  87  header('Expires: Sun, 28 Dec 1997 09:32:45 GMT');
  88  header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
  89  header('Cache-Control: no-cache, must-revalidate');
  90  header('Pragma: no-cache');
  91  header('Content-Type: text/html; charset=utf-8');
  92  
  93  // Required stylesheets.
  94  $stylesheetshtml = '';
  95  /*foreach ($CFG->stylesheets as $stylesheet) {
  96      //TODO: MDL-21120
  97      $stylesheetshtml .= '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'" />';
  98  }*/
  99  
 100  $refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?".
 101                "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
 102  ?>
 103  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 104  <html>
 105      <head>
 106          <meta http-equiv="content-type" content="text/html; charset=utf-8" />
 107          <script type="text/javascript">
 108          //<![CDATA[
 109          function safari_refresh() {
 110              self.location.href= '<?php echo $refreshurl;?>';
 111          }
 112          var issafari = false;
 113          if(window.devicePixelRatio){
 114              issafari = true;
 115              setTimeout('safari_refresh()', <?php echo $CFG->chat_refresh_room * 1000;?>);
 116          }
 117          if (parent.msg.document.getElementById("msgStarted") == null) {
 118              parent.msg.document.close();
 119              parent.msg.document.open("text/html","replace");
 120              parent.msg.document.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
 121              parent.msg.document.write("<html><head>");
 122              parent.msg.document.write("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" />");
 123              parent.msg.document.write("<base target=\"_blank\" />");
 124              parent.msg.document.write("<?php echo addslashes_js($stylesheetshtml) ?>");
 125              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>");
 126          }
 127          //]]>
 128          </script>
 129      </head>
 130      <body>
 131  
 132  <?php
 133  
 134  // Ensure the HTML head makes it out there.
 135  echo $CHAT_DUMMY_DATA;
 136  
 137  for ($n = 0; $n <= CHAT_MAX_CLIENT_UPDATES; $n++) {
 138  
 139      // Ping first so we can later shortcut as needed.
 140      $chatuser->lastping = time();
 141      $DB->set_field('chat_users', 'lastping', $chatuser->lastping, array('id' => $chatuser->id));
 142  
 143      if ($message = chat_get_latest_message($chatuser->chatid, $chatuser->groupid)) {
 144          $chatnewlasttime = $message->timestamp;
 145          $chatnewlastid   = $message->id;
 146      } else {
 147          $chatnewlasttime = 0;
 148          $chatnewlastid   = 0;
 149          print " \n";
 150          print $CHAT_DUMMY_DATA;
 151          sleep($CFG->chat_refresh_room);
 152          continue;
 153      }
 154  
 155      $timenow    = time();
 156  
 157      $params = array('groupid' => $chatuser->groupid,
 158                      'lastid' => $chatlastid,
 159                      'lasttime' => $chatlasttime,
 160                      'chatid' => $chatuser->chatid);
 161      $groupselect = $chatuser->groupid ? " AND (groupid=:groupid OR groupid=0) " : "";
 162  
 163      $newcriteria = '';
 164      if ($chatlastid > 0) {
 165          $newcriteria = "id > :lastid";
 166      } else {
 167          if ($chatlasttime == 0) { // Display some previous messages.
 168              $chatlasttime = $timenow - $CFG->chat_old_ping; // TO DO - any better value?
 169          }
 170          $newcriteria = "timestamp > :lasttime";
 171      }
 172  
 173      $messages = $DB->get_records_select("chat_messages_current",
 174                                     "chatid = :chatid AND $newcriteria $groupselect", $params,
 175                                     "timestamp ASC");
 176  
 177      if ($messages) {
 178          $num = count($messages);
 179      } else {
 180          print " \n";
 181          print $CHAT_DUMMY_DATA;
 182          sleep($CFG->chat_refresh_room);
 183          continue;
 184      }
 185  
 186      print '<script type="text/javascript">' . "\n";
 187      print "//<![CDATA[\n\n";
 188  
 189      $chatnewrow = ($chatlastrow + $num) % 2;
 190  
 191      $refreshusers = false;
 192      $us = array ();
 193      if (($chatlasttime != $chatnewlasttime) and $messages) {
 194  
 195          $beep         = false;
 196          $refreshusers = false;
 197          foreach ($messages as $message) {
 198              $chatlastrow = ($chatlastrow + 1) % 2;
 199              $formatmessage = chat_format_message($message, $chatuser->course, $USER, $chatlastrow);
 200              if ($formatmessage->beep) {
 201                  $beep = true;
 202              }
 203              if ($formatmessage->refreshusers) {
 204                  $refreshusers = true;
 205              }
 206              $us[$message->userid] = $timenow - $message->timestamp;
 207              echo "parent.msg.document.write('".addslashes_js($formatmessage->html )."\\n');\n";
 208  
 209          }
 210          // From the last message printed.
 211          // A strange case where lack of closures is useful!
 212          $chatlasttime = $message->timestamp;
 213          $chatlastid   = $message->id;
 214      }
 215  
 216      if ($refreshusers) {
 217          echo "if (parent.users.document.anchors[0] != null) {" .
 218              "parent.users.location.href = parent.users.document.anchors[0].href;}\n";
 219      } else {
 220          foreach ($us as $uid => $lastping) {
 221              $min = (int) ($lastping / 60);
 222              $sec = $lastping - ($min * 60);
 223              $min = $min < 10 ? '0'.$min : $min;
 224              $sec = $sec < 10 ? '0'.$sec : $sec;
 225              $idle = $min.':'.$sec;
 226              echo "if (parent.users.document.getElementById('uidle{$uid}') != null) {".
 227                      "parent.users.document.getElementById('uidle{$uid}').innerHTML = '$idle';}\n";
 228          }
 229      }
 230  
 231      print <<<EOD
 232      if(parent.input){
 233          var autoscroll = parent.input.document.getElementById('auto');
 234          if(parent.msg && autoscroll && autoscroll.checked){
 235              parent.msg.scroll(1,5000000);
 236          }
 237      }
 238  EOD;
 239      print "//]]>\n";
 240      print '</script>' . "\n\n";
 241      if ($beep) {
 242          print '<embed src="../beep.wav" autostart="true" hidden="true" name="beep" />';
 243      }
 244      print $CHAT_DUMMY_DATA;
 245      sleep($CFG->chat_refresh_room);
 246  } // Here ends the for() loop.
 247  
 248  // Here & should be written & :-D.
 249  $refreshurl = "{$CFG->wwwroot}/mod/chat/gui_header_js/jsupdated.php?";
 250  $refreshurl .= "chat_sid=$chatsid&chat_lasttime=$chatlasttime&chat_lastrow=$chatnewrow&chat_lastid=$chatlastid";
 251  
 252  print '<script type="text/javascript">' . "\n";
 253  print "//<![CDATA[ \n\n";
 254  print "location.href = '$refreshurl';\n";
 255  print "//]]>\n";
 256  print '</script>' . "\n\n";
 257  ?>
 258  
 259      </body>
 260  </html>