mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
synced 2024-11-27 17:40:11 +00:00
58 lines
1.5 KiB
PHP
58 lines
1.5 KiB
PHP
<?php
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/**
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* Captcha class using simple sums and the math renderer
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* Not brilliant, but enough to dissuade casual spam bots
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*
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* @addtogroup Extensions
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* @author Rob Church <robchur@gmail.com>
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* @copyright © 2006 Rob Church
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* @licence GNU General Public Licence 2.0
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*/
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if( defined( 'MEDIAWIKI' ) ) {
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class MathCaptcha extends SimpleCaptcha {
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/** Validate a captcha response */
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function keyMatch( $req, $info ) {
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return (int)$req->getVal( 'wpCaptchaAnswer' ) == (int)$info['answer'];
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}
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/** Produce a nice little form */
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function getForm() {
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list( $sum, $answer ) = $this->pickSum();
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$index = $this->storeCaptcha( array( 'answer' => $answer ) );
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$form = '<table><tr><td>' . $this->fetchMath( $sum ) . '</td>';
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$form .= '<td>' . wfInput( 'wpCaptchaAnswer', false, false, array( 'tabindex' => '1' ) ) . '</td></tr></table>';
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$form .= wfHidden( 'wpCaptchaId', $index );
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return $form;
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}
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/** Pick a random sum */
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function pickSum() {
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$a = mt_rand( 0, 100 );
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$b = mt_rand( 0, 10 );
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$op = mt_rand( 0, 1 ) ? '+' : '-';
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$sum = "{$a} {$op} {$b} = ";
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$ans = $op == '+' ? ( $a + $b ) : ( $a - $b );
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return array( $sum, $ans );
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}
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/** Fetch the math */
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function fetchMath( $sum ) {
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$math = new MathRenderer( $sum );
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$math->setOutputMode( MW_MATH_PNG );
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$html = $math->render();
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return preg_replace( '/alt=".*"/', '', $html );
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}
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}
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} else {
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echo( "This file is an extension to the MediaWiki software and cannot be used standalone.\n" );
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die( 1 );
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}
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?>
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