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<?php
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// $Id$
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/*
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 Website Baker Project <http://www.websitebaker.org/>
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 Copyright (C) 2004-2008, Ryan Djurovich
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 Website Baker is free software; you can redistribute it and/or modify
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 it under the terms of the GNU General Public License as published by
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 the Free Software Foundation; either version 2 of the License, or
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 (at your option) any later version.
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 Website Baker is distributed in the hope that it will be useful,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 GNU General Public License for more details.
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 You should have received a copy of the GNU General Public License
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 along with Website Baker; if not, write to the Free Software
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 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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/* CAPTCHA - How to use:
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 * use 
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 *	require_once(WB_PATH.'/include/captcha/captcha.php');
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 * and put 
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 *	<?php call_captcha(); ?>
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 * into your form.
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 *
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 * captcha-code is in $_SESSION['captcha']
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 * user input in $_POST['captcha']
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 */
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// Must include code to stop this file being accessed directly
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if(!defined('WB_PATH')) { exit("Cannot access this file directly"); }
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if(!isset($admin)) {
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	require_once(WB_PATH.'/framework/class.wb.php');
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	$admin = new wb;
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}
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// check if module language file exists for the language set by the user (e.g. DE, EN)
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global $MOD_CAPTCHA;
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if(!file_exists(WB_PATH.'/modules/captcha_control/languages/'.LANGUAGE .'.php')) {
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	// no module language file exists for the language set by the user, include default module language file EN.php
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	require_once(WB_PATH.'/modules/captcha_control/languages/EN.php');
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} else {
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	// a module language file exists for the language defined by the user, load it
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	require_once(WB_PATH.'/modules/captcha_control/languages/'.LANGUAGE .'.php');
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}
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// output-handler for image-captchas to determine size of image
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if(!function_exists('captcha_header')) {
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	function captcha_header() {
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		header("Expires: Mon, 1 Jan 1990 05:00:00 GMT");
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		header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
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		header("Cache-Control: no-store, no-cache, must-revalidate, proxy-revalidate");
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		header("Cache-Control: post-check=0, pre-check=0", false); // MS made there own headers :-(
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		header("Pragma: no-cache");
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		header("Content-type: image/png");
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		return;
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	}
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}
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// get list of available CAPTCHAS for the dropdown-listbox in admin-tools
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if(extension_loaded('gd') && function_exists('imagepng') && function_exists('imagettftext')) {
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	$useable_captchas = array(
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		'calc_text'=>$MOD_CAPTCHA_CONTROL['CALC_TEXT'],
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		'calc_image'=>$MOD_CAPTCHA_CONTROL['CALC_IMAGE'],
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		'ttf_image'=>$MOD_CAPTCHA_CONTROL['TTF_IMAGE'],
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		'old_image'=>$MOD_CAPTCHA_CONTROL['OLD_IMAGE']
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	);
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} elseif(extension_loaded('gd') && function_exists('imagepng')) {
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	$useable_captchas = array(
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		'calc_text'=>$MOD_CAPTCHA_CONTROL['CALC_TEXT'],
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		'calc_image'=>$MOD_CAPTCHA_CONTROL['CALC_IMAGE'],
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		'old_image'=>$MOD_CAPTCHA_CONTROL['OLD_IMAGE']
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	);
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} else {
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	$useable_captchas = array(
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		'calc_text'=>$MOD_CAPTCHA_CONTROL['CALC_TEXT']
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	);
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}
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if(!function_exists('call_captcha')) {
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	function call_captcha() {
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		global $MOD_CAPTCHA;
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		switch(CAPTCHA_TYPE) {
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			// two special cases
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			case 'calc_text': // calculation as text
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				?>
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				<?php include(WB_PATH.'/include/captcha/captchas/calc_text.php'); ?> = 
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				<input type="text" name="captcha" maxlength="5"  style="width:20px" />&nbsp;&nbsp;<?php echo $MOD_CAPTCHA['VERIFICATION_INFO_RES']; ?></font>
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				<?php
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				break;
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			case 'calc_image': // calculation with image (old captcha)
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				?>
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				<img src="<?php echo WB_URL.'/include/captcha/captchas/calc_image.php?t='.time(); ?>" align="middle" alt="Captcha" /> = 
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				<input type="text" name="captcha" maxlength="5" style="width:20px" />&nbsp;&nbsp;<?php echo $MOD_CAPTCHA['VERIFICATION_INFO_RES']; ?></font>
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				<?php
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				break;
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			// normal images
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			case 'ttf_image': // captcha with varying background and ttf-font
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			case 'old_image': // old captcha
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				?>
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				<img src="<?php echo WB_URL.'/include/captcha/captchas/'.CAPTCHA_TYPE.'.php?t='.time(); ?>" align="middle" alt="Captcha" />
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				<input type="text" name="captcha" maxlength="5" style="width:50px" />&nbsp;&nbsp;<?php echo $MOD_CAPTCHA['VERIFICATION_INFO_TEXT']; ?></font>
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				<?php
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				break;
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		}
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	}
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}
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?>
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