#!/usr/bin/env php

<?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.

 */

// Try to trap termination signals to cleanly close the socket when needed

// AmaroK sends a SIGTERM when it is shut down or the user requests to stop

// the script

if ( function_exists('pcntl_signal') )

{

  // required for signal handling to work

  declare(ticks=1);

  // trap SIGTERM

  pcntl_signal(SIGTERM, 'sigterm');

  pcntl_signal(SIGINT,  'sigterm');

  pcntl_signal(SIGUSR1, 'handle_refresh_signal');

}

//

// CONFIGURATION

//

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

// 127.0.0.1 (the loopback interface)

$public = true;

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

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

$allowcontrol = true;

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

$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.

$allow_fork = true;

// set to true to enable authentication

// WARNING: THIS HAS SOME SERIOUS SECURITY PROBLEMS RIGHT NOW. I don't

// know what's causing it to not prompt for authentication from any

// client after the first successful auth.

$use_auth = false;

// valid users and passwords

$auth_data = array(

    'funky' => 'monkey',

    'fast' => 'forward'

  );

@ini_set('display_errors', 'on');

// include files

require('functions.php');

// get the root

define('GREY_ROOT', dirname(__FILE__));

// create directories

@mkdir('./compiled');

// what kind of terminal do we have?

$use_colors = ( @in_array(@$_SERVER['TERM'], array('linux', 'xterm', 'vt100')) ) ? true : false;

// start up...

status('Starting Greyhound Web Control v0.1a3');

status('loading files');

require('webserver.php');

define('SMARTY_DIR', GREY_ROOT . '/smarty/');

require(GREY_ROOT . '/smarty/Smarty.class.php');

require(GREY_ROOT . '/playlist.php');

require(GREY_ROOT . '/json.php');

require(GREY_ROOT . '/ajax.php');

require(GREY_ROOT . '/imagetools.php');

// signal handler

function sigterm($signal)

{

  global $httpd;

  status("Caught SIGTERM, cleaning up.");

  exit(0);

}

status('doing PHP capabilities check');

if ( !function_exists('pcntl_signal') )

{

  warning('System does not support POSIX functions. Termination signals will result in unclean shutdown.');

}

if ( !function_exists('simplexml_load_file') )

{

  warning('Can\'t find support for SimpleXML, which is needed to parse the Amarok playlist file.');

  burnout('SimpleXML required to continue. You may have an outdated version of PHP; most versions of PHP 5 have SimpleXML built-in. Check your distribution\'s documentation to find out how to enable PHP\'s SimpleXML support.');

}

status('initializing playlist');

// init playlist object

$playlist = array();

$amarok_home = false;

rebuild_playlist();

// startup webserver

$ip = ( $public ) ? '0.0.0.0' : '127.0.0.1';

$port = 7447;

try

{

  status('starting PhpHttpd');

  $httpd = new WebServer($ip, $port);

  // setup handlers

  status('initializing handlers');

  $httpd->add_handler('index',                'function', 'amarok_playlist');

  $httpd->add_handler('action.json',          'function', 'ajax_request_handler');

  $httpd->add_handler('artwork',              'function', 'artwork_request_handler');

  $httpd->add_handler('scripts',              'dir',      GREY_ROOT . '/scripts');

  $httpd->add_handler('favicon.ico',          'file',     GREY_ROOT . '/amarok_icon.ico');

  $httpd->add_handler('apple-touch-icon.png', 'file',     GREY_ROOT . '/apple-touch-icon.png');

  // load all themes if forking is enabled

  // Themes are loaded when the playlist is requested. This is fine for

  // single-threaded operation, but if the playlist handler is only loaded

  // in a child process, we need to preload all themes into the parent before

  // children can respond to theme resource requests.

  if ( $allow_fork )

  {

    status('Preloading themes');

    $dh = @opendir(GREY_ROOT . '/themes');

    if ( !$dh )

      burnout('Could not open themes directory');

    while ( $dir = @readdir($dh) )

    {

      if ( $dir == '.' || $dir == '..' )

        continue;

      if ( is_dir( GREY_ROOT . "/themes/$dir" ) )

        load_theme($dir);

    }

  }

  $httpd->allow_dir_list = true;

  $httpd->allow_fork = ( $allow_fork ) ? true : false;

  $httpd->default_document = 'index';

  status("Entering main server loop - ^C to interrupt, listening on port $port");

  $httpd->serve();

}

catch( Exception $e )

{

  if ( strstr(strval($e), "Could not bind") )

  {

    burnout("Could not bind to the port $ip:$port. Is Greyhound already running? Sometimes browsers don't close off their connections until Greyhound has been dead for about a minute, so try starting Greyhound again in roughly 60 seconds. If that doesn't work, type \"killall -9 php\" at a terminal and try starting Greyhound again in 60 seconds.");

  }

  burnout("Exception caught while running webserver:\n$e");

}

function handle_refresh_signal()

{

  global $httpd;

  if ( !is_object($httpd) )

    // we're not serving yet.

    return false;

  // we've got an httpd instance; rebuild the playlist

  rebuild_playlist();

  // if this is the parent, also ask the children to rebuild.

  if ( !defined('HTTPD_WS_CHILD') )

  {

    foreach ( $httpd->child_list as $pid )

    {

      posix_kill($pid, SIGUSR1);

    }

  }

}