142a27035SAndreas Gohr<?php 242a27035SAndreas Gohr/** 342a27035SAndreas Gohr * CAPTCHA antispam plugin - sound generator 442a27035SAndreas Gohr * 542a27035SAndreas Gohr * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) 642a27035SAndreas Gohr * @author Andreas Gohr <gohr@cosmocode.de> 742a27035SAndreas Gohr */ 842a27035SAndreas Gohr 9265a0b9eSAndreas Gohrif(!defined('DOKU_INC')) define('DOKU_INC', dirname(__FILE__).'/../../../'); 1042a27035SAndreas Gohrdefine('NOSESSION', true); 1142a27035SAndreas Gohrdefine('DOKU_DISABLE_GZIP_OUTPUT', 1); 1242a27035SAndreas Gohrrequire_once(DOKU_INC.'inc/init.php'); 1342a27035SAndreas Gohrrequire_once(DOKU_INC.'inc/auth.php'); 1442a27035SAndreas Gohr 1542a27035SAndreas Gohr$ID = $_REQUEST['id']; 162cab8f1fSAndreas Gohr/** @var $plugin helper_plugin_captcha */ 1777e00bf9SAndreas Gohr$plugin = plugin_load('helper', 'captcha'); 182cab8f1fSAndreas Gohr 192cab8f1fSAndreas Gohrif($plugin->getConf('mode') != 'audio') { 202cab8f1fSAndreas Gohr http_status(404); 212cab8f1fSAndreas Gohr exit; 222cab8f1fSAndreas Gohr} 232cab8f1fSAndreas Gohr 24f044313dSAndreas Gohr$rand = $plugin->decrypt($_REQUEST['secret']); 2542a27035SAndreas Gohr$code = strtolower($plugin->_generateCAPTCHA($plugin->_fixedIdent(), $rand)); 2642a27035SAndreas Gohr 2742a27035SAndreas Gohr// prepare an array of wavfiles 2842a27035SAndreas Gohr$lc = dirname(__FILE__).'/lang/'.$conf['lang'].'/audio/'; 2942a27035SAndreas Gohr$en = dirname(__FILE__).'/lang/en/audio/'; 3042a27035SAndreas Gohr$wavs = array(); 31*9a516edaSPatrick Brown$lettercount = $plugin->getConf('lettercount'); 32*9a516edaSPatrick Brownif($lettercount > strlen($code)) $lettercount = strlen($code); 33*9a516edaSPatrick Brownfor($i = 0; $i < $lettercount; $i++) { 3442a27035SAndreas Gohr $file = $lc.$code{$i}.'.wav'; 3542a27035SAndreas Gohr if(!@file_exists($file)) $file = $en.$code{$i}.'.wav'; 3642a27035SAndreas Gohr $wavs[] = $file; 3742a27035SAndreas Gohr} 3842a27035SAndreas Gohr 3942a27035SAndreas Gohrheader('Content-type: audio/x-wav'); 4042a27035SAndreas Gohrheader('Content-Disposition: attachment;filename=captcha.wav'); 4142a27035SAndreas Gohr 4242a27035SAndreas Gohrecho joinwavs($wavs); 4342a27035SAndreas Gohr 4442a27035SAndreas Gohr/** 4542a27035SAndreas Gohr * Join multiple wav files 4642a27035SAndreas Gohr * 4742a27035SAndreas Gohr * All wave files need to have the same format and need to be uncompressed. 4842a27035SAndreas Gohr * The headers of the last file will be used (with recalculated datasize 4942a27035SAndreas Gohr * of course) 5042a27035SAndreas Gohr * 5142a27035SAndreas Gohr * @link http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/ 5242a27035SAndreas Gohr * @link http://www.thescripts.com/forum/thread3770.html 5342a27035SAndreas Gohr */ 5442a27035SAndreas Gohrfunction joinwavs($wavs) { 55c2695b40SAndreas Gohr $fields = join( 56c2695b40SAndreas Gohr '/', array( 57c2695b40SAndreas Gohr 'H8ChunkID', 'VChunkSize', 'H8Format', 5842a27035SAndreas Gohr 'H8Subchunk1ID', 'VSubchunk1Size', 5942a27035SAndreas Gohr 'vAudioFormat', 'vNumChannels', 'VSampleRate', 60c2695b40SAndreas Gohr 'VByteRate', 'vBlockAlign', 'vBitsPerSample' 61c2695b40SAndreas Gohr ) 62c2695b40SAndreas Gohr ); 6342a27035SAndreas Gohr 6442a27035SAndreas Gohr $data = ''; 6542a27035SAndreas Gohr foreach($wavs as $wav) { 6642a27035SAndreas Gohr $fp = fopen($wav, 'rb'); 6742a27035SAndreas Gohr $header = fread($fp, 36); 6842a27035SAndreas Gohr $info = unpack($fields, $header); 6942a27035SAndreas Gohr 7042a27035SAndreas Gohr // read optional extra stuff 7142a27035SAndreas Gohr if($info['Subchunk1Size'] > 16) { 7242a27035SAndreas Gohr $header .= fread($fp, ($info['Subchunk1Size'] - 16)); 7342a27035SAndreas Gohr } 7442a27035SAndreas Gohr 7542a27035SAndreas Gohr // read SubChunk2ID 7642a27035SAndreas Gohr $header .= fread($fp, 4); 7742a27035SAndreas Gohr 7842a27035SAndreas Gohr // read Subchunk2Size 7942a27035SAndreas Gohr $size = unpack('vsize', fread($fp, 4)); 8042a27035SAndreas Gohr $size = $size['size']; 8142a27035SAndreas Gohr 8242a27035SAndreas Gohr // read data 8342a27035SAndreas Gohr $data .= fread($fp, $size); 8442a27035SAndreas Gohr } 8542a27035SAndreas Gohr 8642a27035SAndreas Gohr return $header.pack('V', strlen($data)).$data; 8742a27035SAndreas Gohr} 8842a27035SAndreas Gohr 89