zoneminder/web/includes/actions/settings.php

<?php
//
// ZoneMinder web action file
// Copyright (C) 2019 ZoneMinder LLC
//
// This program 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 2
// of the License, or (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//


// Monitor control actions, require a monitor id and control view permissions for that monitor
if ( empty($_REQUEST['mid']) ) {
  ZM\Warning('Settings requires a monitor id');
  return;
}
if ( ! canView('Control', $_REQUEST['mid']) ) {
  ZM\Warning('Settings requires the Control permission');
  return;
}

require_once('includes/Monitor.php');
$mid = validInt($_REQUEST['mid']);
if ( $action == 'settings' ) {
  $args = ' -m ' . escapeshellarg($mid);
  $args .= ' -B' . escapeshellarg($_REQUEST['newBrightness']);
  $args .= ' -C' . escapeshellarg($_REQUEST['newContrast']);
  $args .= ' -H' . escapeshellarg($_REQUEST['newHue']);
  $args .= ' -O' . escapeshellarg($_REQUEST['newColour']);

  $zmuCommand = getZmuCommand($args);

  $zmuOutput = exec($zmuCommand);
  list($brightness, $contrast, $hue, $colour) = explode(' ', $zmuOutput);
  dbQuery(
    'UPDATE Monitors SET Brightness = ?, Contrast = ?, Hue = ?, Colour = ? WHERE Id = ?',
    array($brightness, $contrast, $hue, $colour, $mid));
}
?>