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