functions.php
author Dan
Mon, 24 Mar 2008 02:53:42 -0400
changeset 10 d3059e20b0fa
parent 9 63a257541313
child 13 b5db2345c397
permissions -rw-r--r--
SECURITY: Fix ability to crash server in ajax.php; added playback position slider and ability to seek through current song
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<?php
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/**
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 * Utility functions
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 * 
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 * Greyhound - real web management for Amarok
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 * Copyright (C) 2008 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Utility/reporting functions
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 */
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/**
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 * Report a fatal error and exit
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 * @param string Error message
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 */
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function burnout($msg)
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{
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  $h = @fopen('php://stderr', 'w');
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  fwrite($h, "\x1B[31;1m[Greyhound] fatal: \x1B[37;1m");
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  fwrite($h, "$msg\x1B[0m\n");
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  fclose($h);
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  exit(1);
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}
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/**
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 * Print a stylized status message, compatible with Linux consoles
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 * @param string Status message
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 */
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function status($msg)
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{
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  $h = @fopen('php://stderr', 'w');
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  fwrite($h, "\x1B[32;1m[Greyhound] \x1B[32;0m$msg\x1B[0m\n");
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  fclose($h);
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}
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/**
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 * Performs an action with DCOP.
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 * @param string DCOP component, e.g. player, playlist, playlistbrowser, ...
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 * @param string Action to perform, e.g. stop, play, ...
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 * @param string additional parameters... (NOT IMPLEMENTED)
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 * @return mixed output of DCOP command
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 */
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function dcop_action($component, $action)
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{
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  $tmpfile = tempnam('amaweb', '');
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  if ( !$tmpfile )
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    burnout('tempnam() failed us');
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  system("dcop amarok $component $action > $tmpfile");
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  $output = @file_get_contents($tmpfile);
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  @unlink($tmpfile);
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  $output = trim($output);
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  // detect type of output
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  if ( $output == 'true' )
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    return true;
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  else if ( $output == 'false' )
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    return false;
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  else if ( preg_match('/^-?[0-9]+/', $output) )
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    return intval($output);
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  else
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    return $output;
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}
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/**
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 * Rebuilds the copy of the playlist in RAM
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 */
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$playlist_last_md5 = '';
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function rebuild_playlist()
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{
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  // import what we need
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  global $homedir, $playlist;
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  // sync and load the playlist file
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  $playlist_file = dcop_action('playlist', 'saveCurrentPlaylist');
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  // check MD5 - if it's not changed, exit to save CPU cycles
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  global $playlist_last_md5;
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  $effective_md5 = md5_playlist_file($playlist_file);
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  if ( $playlist_last_md5 == $effective_md5 )
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  {
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    return true;
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  }
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  $playlist_last_md5 = $effective_md5;
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  // start XML parser
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  try
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  {
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    $xml = simplexml_load_file($playlist_file);
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  }
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  catch ( Exception $e )
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  {
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    burnout("Caught exception trying to load playlist file:\n$e");
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  }
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  $attribs = $xml->attributes();
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  if ( @$attribs['product'] != 'Amarok' )
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  {
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    burnout('Playlist is not in Amarok format');
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  }
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  $playlist = array();
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  foreach ( $xml->children() as $child )
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  {
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    $attribs = $child->attributes();
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    $item = array(
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        'uri'    => $attribs['uri'],
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        'title'  => strval($child->Title),
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        'artist' => strval($child->Artist),
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        'album'  => strval($child->Album),
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        'length' => seconds_to_str(intval($child->Length)),
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        'length_int' => intval($child->Length)
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      );
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    $playlist[] = $item;
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  }
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}
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/**
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 * Builds the correct MD5 check for the specified playlist XML file. This is designed to base on the list of actual tracks, disregarding
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 * the rest of the text in the XML file.
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 * @param string Path to playlist
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 * @return string hash
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 */
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function md5_playlist_file($file)
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{
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  $contents = @file_get_contents($file);
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  if ( empty($contents) )
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    return false;
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  $count = preg_match_all('/uniqueid="([a-fA-F0-9]+?)"/', $contents, $matches);
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  $matches = implode("", $matches[1]);
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  return md5($matches);
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}
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/**
0
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 * Converts a number to minute:second format
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 * @param int Seconds
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 * @return string format: mm:ss
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 */
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function seconds_to_str($secs)
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{
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  $seconds = $secs % 60;
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  $minutes = ( $secs - $seconds ) / 60;
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  $seconds = strval($seconds);
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  $minutes = strval($minutes);
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  if ( strlen($seconds) < 2 )
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    $seconds = "0$seconds";
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  if ( strlen($minutes) < 2 )
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    $minutes = "0$minutes";
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  return "$minutes:$seconds";
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}
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4
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/**
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 * Loads the specified theme into Smarty
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 * @param string Theme ID
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 * @return object Smarty object
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 */
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function load_theme($theme_id)
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{
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  global $httpd;
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  static $smarty = array();
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  if ( !isset($smarty[$theme_id]) )
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  {
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    $smarty[$theme_id] = new Smarty();
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    $smarty[$theme_id]->template_dir = GREY_ROOT . "/themes/$theme_id";
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    if ( !is_dir("./compiled/$theme_id") )
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      @mkdir("./compiled/$theme_id");
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    $smarty[$theme_id]->compile_dir  = "./compiled/$theme_id";
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    $smarty[$theme_id]->config_dir = "./config";
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    $httpd->add_handler("themes/$theme_id", 'dir', GREY_ROOT . "/themes/$theme_id");
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  }
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  return $smarty[$theme_id];
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}