<?php

/**

 * Greyhound - real web management for Amarok

 * Copyright (C) 2008 Dan Fuhry

 *

 * This program is Free Software; you can redistribute 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 details.

 */

// rebooting doesn't work at this point

define('REBOOT_SUPPORT', false);

function greyhound_config($httpd, $socket)

{

  global $use_auth;

  // validate the session

  if ( !session_check() )

  {

    $httpd->header('HTTP/1.1 307 Temporary Redirect');

    $httpd->header('Location: /login');

    return;

  }

  $tried = false;

  $success = false;

  $needpass = false;

  $error = false;

  // if a config password is set, make sure it matches.

  $authed = false;

  if ( empty($GLOBALS['configpass']) )

  {

    $authed = true;

  }

  else

  {

    $needpass = true;

    if ( isset($_POST['configpass']) && sha1($_POST['configpass']) === $GLOBALS['configpass'] )

    {

      $authed = true;

      $tried = true;

    }

    else if ( isset($_POST['configpass']) )

    {

      $error = 'You didn\'t enter the right configuration password, so the changes weren\'t saved.';

      $tried = true;

    }

  }

  if ( $authed && isset($_POST['submit']) )

  {

    $tried = true;

    $need_reboot = ( isset($_POST['public']) !== $GLOBALS['public'] ||

                     isset($_POST['ipv6']) !== $GLOBALS['enable_ipv6'] ||

                     isset($_POST['allow_fork']) !== $GLOBALS['allow_fork']);

    // compile the new config file

    $public = ( isset($_POST['public']) ) ? 'true' : 'false';

    $allowcontrol = ( isset($_POST['allowcontrol']) ) ? 'true' : 'false';

    $allow_fork = ( isset($_POST['allow_fork']) ) ? 'true' : 'false';

    $use_auth = ( isset($_POST['use_auth']) ) ? 'true' : 'false';

    $ipv6_settings = ( isset($_POST['ipv6']) ) ? '$GLOBALS[\'enable_ipv4\'] = false;

$GLOBALS[\'enable_ipv6\'] = true;' : '$GLOBALS[\'enable_ipv4\'] = true;

$GLOBALS[\'enable_ipv6\'] = false;';

    $GLOBALS['enable_ipv6'] = isset($_POST['ipv6']);

    // for auth_data, we're going to merge the data from POST with the current auth_data array.

    $auth_data = $GLOBALS['auth_data'];

    $auth_changed = false;

    if ( isset($_POST['users']) )

    {

      foreach ( $auth_data as $user => $pass )

      {

        if ( !in_array($user, $_POST['users']) )

        {

          $auth_changed = true;

          unset($auth_data[$user]);

        }

      }

    }

    else

    {

      if ( !empty($auth_data) )

      {

        $auth_data = array();

        $auth_changed = true;

      } 

    }

    if ( isset($_POST['users_add']) )

    {

      foreach ( $_POST['users_add'] as $user => $pass )

      {

        $auth_changed = true;

        $auth_data[$user] = $pass;

      }

    }

    $auth_data = var_export_string($auth_data);

    $new_configpass = ( isset($_POST['newconfigpass']) && is_string($_POST['newconfigpass']) && $_POST['newconfigpass'] != '____________________' ) ? sha1($_POST['newconfigpass']) : $GLOBALS['configpass'];

    if ( isset($_POST['newconfigpass']) && $_POST['newconfigpass'] === true )

      $new_configpass = '';

    $needpass = ( $new_configpass != '' );

    $config_file = <<<EOF

<?php

//

// GREYHOUND CONFIGURATION

//

// Listen on all interfaces. If this is false, it will only listen on

// 127.0.0.1 (the loopback interface)

\$GLOBALS['public'] = $public;

// Allow control of playback. By default this is turned on but if you

// set this to false, it will only display the playlist.

\$GLOBALS['allowcontrol'] = $allowcontrol;

// The default theme. This should be a name of a directory in ./themes.

\$GLOBALS['theme'] = 'grey';

// Allow forking when an HTTP request is received. This has advantages

// and disadvantages. If this experimental option is enabled, it will

// result in faster responses and load times but more memory usage.

\$GLOBALS['allow_fork'] = $allow_fork;

// set to true to enable authentication

// this uses cookies, so make sure they're enabled in your browser

\$GLOBALS['use_auth'] = $use_auth;

// valid users and passwords

\$GLOBALS['auth_data'] = $auth_data;

// password for site configuration

\$GLOBALS['configpass'] = '$new_configpass';

// IPv4 and IPv6

$ipv6_settings

EOF;

    $error = 'Couldn\'t write to the config file (./greyhound-config.php).';

    $fp = @fopen('./greyhound-config.php', 'w');

    if ( $fp )

    {

      fwrite($fp, $config_file);

      fclose($fp);

      $passblurb = $auth_changed ? "\n<small>If you changed your own password, you've been logged out so you'll need to log back in again.</small>" : '';

      if ( REBOOT_SUPPORT )

      {

        $rebootblurb = $need_reboot ? "\n<small>Since you changed some core configuration values, the Greyhound server has been restarted.</small>\n<small>If Greyhound doesn't respond, wait 20 seconds and then restart it using Amarok's script manager.</small>" : '';

      }

      else

      {

        $rebootblurb = $need_reboot ? "\n<small>Please restart Greyhound using Amarok's script manager for public IP, multithreading, and IPv6 options to take effect.</small>" : '';

      }

      $success = "Configuration changes successful.{$passblurb}{$rebootblurb}";

      if ( $httpd->threader->is_child() )

      {

        $httpd->threader->ipc_send(array('action' => 'reloadconfig', 'propagate' => true));

      }

      else

      {

        grey_reload_config();

      }

      if ( $need_reboot && REBOOT_SUPPORT )

      {

        if ( $GLOBALS['enable_ipv6'] )

        {

          $addr = isset($_POST['public']) ? '::' : '::1';

        }

        else

        {

          $addr = isset($_POST['public']) ? '0.0.0.0' : '127.0.0.1';

        }

        $fork = isset($_POST['allow_fork']);

        $httpd->reboot($addr, null, $fork);

      }

    }

  }

  global $theme;

  $iphone = ( ( strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone') ||

       strpos($_SERVER['HTTP_USER_AGENT'], 'iPod') ||

       strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') ||

       isset($_GET['m']) )

       && !isset($_GET['f'])

       );

  $theme_id = ( $iphone ) ? 'iphone' : $theme;

  $smarty = load_theme($theme_id);

  $smarty->assign('theme', $theme_id);

  $smarty->assign('greyhound_version', GREY_VERSION);

  $smarty->assign('tried', $tried);

  $smarty->assign('success', $success);

  $smarty->assign('needpass', $needpass);

  $smarty->assign('use_auth', $use_auth);

  $smarty->assign('public', $GLOBALS['public']);

  $smarty->assign('ipv6', $GLOBALS['enable_ipv6']);

  $smarty->assign('allowcontrol', $GLOBALS['allowcontrol']);

  $smarty->assign('allow_fork', $GLOBALS['allow_fork']);

  $smarty->assign('use_auth', $GLOBALS['use_auth']);

  $smarty->assign('users', $GLOBALS['auth_data']);

  $smarty->assign('reboot_support', REBOOT_SUPPORT);

  $smarty->assign('error', $error);

  $smarty->display('config.tpl');

}