pickSum(); $html = $this->fetchMath( $sum ); $index = $this->storeCaptcha( [ 'answer' => $answer ] ); $resultArr['captcha'] = $this->describeCaptchaType(); $resultArr['captcha']['id'] = $index; $resultArr['captcha']['question'] = $html; } public function describeCaptchaType() { return [ 'type' => 'math', 'mime' => 'text/html', ]; } /** * Produce a nice little form * @param OutputPage $out */ function getForm( OutputPage $out, $tabIndex = 1 ) { list( $sum, $answer ) = $this->pickSum(); $index = $this->storeCaptcha( [ 'answer' => $answer ] ); $form = ''; $form .= '

' . $this->fetchMath( $sum ) . '

' . Html::input( 'wpCaptchaWord', false, false, [ 'tabindex' => $tabIndex, 'autocomplete' => 'off', 'required' ] ) . '

'; $form .= Html::hidden( 'wpCaptchaId', $index ); return $form; } /** Pick a random sum */ function pickSum() { $a = mt_rand( 0, 100 ); $b = mt_rand( 0, 10 ); $op = mt_rand( 0, 1 ) ? '+' : '-'; $sum = "{$a} {$op} {$b} = "; $ans = $op == '+' ? ( $a + $b ) : ( $a - $b ); return [ $sum, $ans ]; } /** Fetch the math */ function fetchMath( $sum ) { if ( class_exists( 'MathRenderer' ) ) { $math = MathRenderer::getRenderer( $sum, [], 'png' ); } else { throw new LogicException( 'MathCaptcha requires the Math extension for MediaWiki versions 1.18 and above.' ); } $math->render(); $html = $math->getHtmlOutput(); return preg_replace( '/alt=".*?"/', '', $html ); } public function getCaptcha() { list( $sum, $answer ) = $this->pickSum(); return [ 'question' => $sum, 'answer' => $answer ]; } public function getCaptchaInfo( $captchaData, $id ) { $sum = $captchaData['question']; return $this->fetchMath( $sum ); } public function onAuthChangeFormFields( array $requests, array $fieldInfo, array &$formDescriptor, $action ) { /** @var CaptchaAuthenticationRequest $req */ $req = AuthenticationRequest::getRequestByClass( $requests, CaptchaAuthenticationRequest::class, true ); if ( !$req ) { return; } $formDescriptor['captchaInfo']['raw'] = true; $formDescriptor['captchaWord']['label-message'] = null; } }