MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / extensions / ConfirmEdit / MathCaptcha / MathCaptcha.class.php

diff --git a/extensions/ConfirmEdit/MathCaptcha/MathCaptcha.class.php b/extensions/ConfirmEdit/MathCaptcha/MathCaptcha.class.php
new file mode 100644 (file)
index 0000000..4ee178d
--- /dev/null
+++ b/extensions/ConfirmEdit/MathCaptcha/MathCaptcha.class.php
@@ -0,0 +1,119 @@
+<?php
+
+use MediaWiki\Auth\AuthenticationRequest;
+
+class MathCaptcha extends SimpleCaptcha {
+
+       /**
+        * Validate a captcha response
+        * @param string $answer
+        * @param array $info
+        * @return bool
+        */
+       function keyMatch( $answer, $info ) {
+               return (int)$answer == (int)$info['answer'];
+       }
+
+       /**
+        * @param array $resultArr
+        */
+       function addCaptchaAPI( &$resultArr ) {
+               list( $sum, $answer ) = $this->pickSum();
+               $html = $this->fetchMath( $sum );
+               $index = $this->storeCaptcha( [ 'answer' => $answer ] );
+               $resultArr['captcha'] = $this->describeCaptchaType();
+               $resultArr['captcha']['id'] = $index;
+               $resultArr['captcha']['question'] = $html;
+       }
+
+       /**
+        * @return array
+        */
+       public function describeCaptchaType() {
+               return [
+                       'type' => 'math',
+                       'mime' => 'text/html',
+               ];
+       }
+
+       /**
+        * @param int $tabIndex
+        * @return array
+        */
+       function getFormInformation( $tabIndex = 1 ) {
+               list( $sum, $answer ) = $this->pickSum();
+               $index = $this->storeCaptcha( [ 'answer' => $answer ] );
+
+               $form = '<table><tr><td>' . $this->fetchMath( $sum ) . '</td>';
+               $form .= '<td>' . Html::input( 'wpCaptchaWord', false, false, [
+                       'tabindex' => $tabIndex,
+                       'autocomplete' => 'off',
+                       'required'
+               ] ) . '</td></tr></table>';
+               $form .= Html::hidden( 'wpCaptchaId', $index );
+               return [ 'html' => $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 );
+       }
+
+       /**
+        * @return array
+        */
+       public function getCaptcha() {
+               list( $sum, $answer ) = $this->pickSum();
+               return [ 'question' => $sum, 'answer' => $answer ];
+       }
+
+       /**
+        * @param array $captchaData
+        * @param string $id
+        * @return mixed
+        */
+       public function getCaptchaInfo( $captchaData, $id ) {
+               $sum = $captchaData['question'];
+               return $this->fetchMath( $sum );
+       }
+
+       /**
+        * @param array $requests
+        * @param array $fieldInfo
+        * @param array $formDescriptor
+        * @param string $action
+        */
+       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;
+       }
+}