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<?php |
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/** |
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* webtrees: online genealogy |
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* Copyright (C) 2019 webtrees development team |
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* This program 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 3 of the License, or |
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* (at your option) any later version. |
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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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declare(strict_types=1); |
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namespace Fisharebest\Webtrees\Services; |
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use Fisharebest\Webtrees\Session; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Ramsey\Uuid\Uuid; |
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use function view; |
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/** |
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* Completely Automated Public Turing test to tell Computers and Humans Apart. |
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*/ |
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class CaptchaService |
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{ |
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// If the form is completed faster than this, then suspect a robot. |
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private const MINIMUM_FORM_TIME = 3.0; |
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/** |
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* Create the captcha |
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* |
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* @return string |
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*/ |
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public function createCaptcha(): string |
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{ |
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$x = Uuid::uuid4()->toString(); |
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$y = Uuid::uuid4()->toString(); |
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$z = Uuid::uuid4()->toString(); |
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Session::put('captcha-t', microtime(true)); |
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Session::put('captcha-x', $x); |
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Session::put('captcha-y', $y); |
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Session::put('captcha-z', $z); |
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return view('captcha', [ |
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'x' => $x, |
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'y' => $y, |
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'z' => $z, |
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]); |
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} |
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/** |
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* Check the user's response. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return bool |
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*/ |
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public function isRobot(ServerRequestInterface $request): bool |
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{ |
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$t = Session::pull('captcha-t', ''); |
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$x = Session::pull('captcha-x', ''); |
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$y = Session::pull('captcha-y', ''); |
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$z = Session::pull('captcha-z', ''); |
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$value_x = $request->getParsedBody()[$x] ?? ''; |
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$value_y = $request->getParsedBody()[$y] ?? ''; |
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// The captcha uses javascript to copy value z from field y to field x. |
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// Expect it in both fields. |
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if ($value_x !== $z || $value_y !== $z) { |
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return true; |
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} |
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// If the form was returned too quickly, the probably a robot. |
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return microtime(true) < $t + self::MINIMUM_FORM_TIME; |
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} |
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} |
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fisharebest /
webtrees
