website_jukni/dokuwiki/lib/plugins/captcha/wav.php
2017-12-29 15:51:59 +01:00

88 lines
2.5 KiB
PHP

<?php
/**
* CAPTCHA antispam plugin - sound generator
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <gohr@cosmocode.de>
*/
if(!defined('DOKU_INC')) define('DOKU_INC', dirname(__FILE__).'/../../../');
define('NOSESSION', true);
define('DOKU_DISABLE_GZIP_OUTPUT', 1);
require_once(DOKU_INC.'inc/init.php');
require_once(DOKU_INC.'inc/auth.php');
$ID = $_REQUEST['id'];
/** @var $plugin helper_plugin_captcha */
$plugin = plugin_load('helper', 'captcha');
if($plugin->getConf('mode') != 'audio' && $plugin->getConf('mode') != 'svgaudio') {
http_status(404);
exit;
}
$rand = $plugin->decrypt($_REQUEST['secret']);
$code = strtolower($plugin->_generateCAPTCHA($plugin->_fixedIdent(), $rand));
// prepare an array of wavfiles
$lc = dirname(__FILE__).'/lang/'.$conf['lang'].'/audio/';
$en = dirname(__FILE__).'/lang/en/audio/';
$wavs = array();
$lettercount = $plugin->getConf('lettercount');
if($lettercount > strlen($code)) $lettercount = strlen($code);
for($i = 0; $i < $lettercount; $i++) {
$file = $lc.$code{$i}.'.wav';
if(!@file_exists($file)) $file = $en.$code{$i}.'.wav';
$wavs[] = $file;
}
header('Content-type: audio/x-wav');
header('Content-Disposition: attachment;filename=captcha.wav');
echo joinwavs($wavs);
/**
* Join multiple wav files
*
* All wave files need to have the same format and need to be uncompressed.
* The headers of the last file will be used (with recalculated datasize
* of course)
*
* @link http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/
* @link http://www.thescripts.com/forum/thread3770.html
*/
function joinwavs($wavs) {
$fields = join(
'/', array(
'H8ChunkID', 'VChunkSize', 'H8Format',
'H8Subchunk1ID', 'VSubchunk1Size',
'vAudioFormat', 'vNumChannels', 'VSampleRate',
'VByteRate', 'vBlockAlign', 'vBitsPerSample'
)
);
$data = '';
foreach($wavs as $wav) {
$fp = fopen($wav, 'rb');
$header = fread($fp, 36);
$info = unpack($fields, $header);
// read optional extra stuff
if($info['Subchunk1Size'] > 16) {
$header .= fread($fp, ($info['Subchunk1Size'] - 16));
}
// read SubChunk2ID
$header .= fread($fp, 4);
// read Subchunk2Size
$size = unpack('vsize', fread($fp, 4));
$size = $size['size'];
// read data
$data .= fread($fp, $size);
}
return $header.pack('V', strlen($data)).$data;
}