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<?php
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// $Id: captcha.php 609 2008-01-26 22:56:28Z thorn $
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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 $MOD_CAPTCHA;
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$t = time();
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$_SESSION['captcha_time'] = $t;
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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" /> <?php echo $MOD_CAPTCHA['VERIFICATION_INFO_RES']; ?></font>
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<?php
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break;
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case 'calc_image': // calculation with image (old captcha)
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?>
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<img src="<?php echo WB_URL."/include/captcha/captchas/calc_image.php?t=$t"; ?>" align="middle" alt="Captcha" /> =
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<input type="text" name="captcha" maxlength="5" style="width:20px" /> <?php echo $MOD_CAPTCHA['VERIFICATION_INFO_RES']; ?></font>
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<?php
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break;
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// normal images
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case 'ttf_image': // captcha with varying background and ttf-font
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case 'old_image': // old captcha
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?>
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<img src="<?php echo WB_URL.'/include/captcha/captchas/'.CAPTCHA_TYPE.".php?t=$t"; ?>" align="middle" alt="Captcha" />
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<input type="text" name="captcha" maxlength="5" style="width:50px" /> <?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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