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Path: /data/applications/aps/gallery/2.2-08/htdocs/modules/captcha/classes/ [ Home ]
File: CaptchaHelper.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2007 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * @package Captcha
 * @subpackage Classes
 * @author Stefan Ioachim <stefanioachim@gmail.com>
 * @author Bharat Mediratta <bharat@menalto.com>
 * @version $Revision: 15513 $
 */
class CaptchaHelper {
    /**
     * Verify the existence of the GD functions that we require to draw a captcha.
     * @return array ('fail' => array(func, func, ...), 'success' => array(func, func, ...))
     */
    function testRequiredGdFunctions() {
	global $gallery;
	$phpVm = $gallery->getPhpVm();

	$gdFunctions = array();
	$gdFunctions[] = 'ImageCreateFromJPEG';
	$gdFunctions[] = 'ImageColorAllocate';
	$gdFunctions[] = 'ImageString';
	$gdFunctions[] = 'ImageJPEG';
	$gdFunctions[] = 'ImageDestroy';
	$gdFunctions[] = 'imagesx';

	$gdReport = array('success' => array(), 'fail' => array());
	foreach ($gdFunctions as $gdFunction) {
	    if ($phpVm->function_exists($gdFunction)) {
		$gdReport['success'][] = $gdFunction;
	    } else {
		$gdReport['fail'][] = $gdFunction;
	    }
	}

	return $gdReport;
    }

    /**
     * Generate a new captcha code and put it into the session.
     */
    function generateCaptchaSessionKey() {
	global $gallery;
	list ($usec, $sec) = explode(' ', microtime());
	$random_num = rand();
	$datekey = date('H i s');
	$rcode = hexdec(md5(GalleryUtilities::getServerVar('HTTP_USER_AGENT') .
			    $random_num . $datekey));
	$code = substr($rcode, 2, 6);
	$session =& $gallery->getSession();
	$session->put('captcha.key', $code);
    }
}
?>