108 lines
3.7 KiB
PHP
108 lines
3.7 KiB
PHP
<?php
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/**
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* Name: Math-Captcha
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* Description: This addon adds a smal calculation, which needs to be solved correctly before a new registration can be done
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* Version: 0.1
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* Author: Tobias Diekershoff <tobias@social.diekershoff.de>
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* License: MIT style
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**/
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use Friendica\App;
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use Friendica\Core\Hook;
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use Friendica\Core\L10n;
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use Friendica\Core\Renderer;
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use Friendica\Core\System;
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function mathcaptcha_install()
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{
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Hook::register('register_form', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_register_form');
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Hook::register('register_post', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_register_post');
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Hook::register('template_vars', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_template_vars');
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}
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function mathcaptcha_uninstall()
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{
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Hook::unregister('register_form', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_register_form');
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Hook::unregister('register_post', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_register_post');
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Hook::unregister('template_vars', 'addon/mathcaptcha/mathcaptcha.php', 'mathcaptcha_template_vars');
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}
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/**
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* Check if the captcha was solved correctly when posting the registration form
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*/
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function mathcaptcha_register_post(App $a, &$b)
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{
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$solution = 0;
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switch ($_SESSION['mathcaptcha_op']){
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case 0:
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$solution = $_SESSION['mathcaptcha_n1'] + $_SESSION['mathcaptcha_n2'];
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break;
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case 1:
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$solution = $_SESSION['mathcaptcha_n1'] - $_SESSION['mathcaptcha_n2'];
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break;
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case 2:
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$solution = $_SESSION['mathcaptcha_n1'] * $_SESSION['mathcaptcha_n2'];
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break;
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}
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unset($_SESSION['mathcaptcha_n1']);
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unset($_SESSION['mathcaptcha_n2']);
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unset($_SESSION['mathcaptcha_op']);
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$post = $b['post'];
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if ($solution == $post['mathcaptcha']) {
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return true;
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} else {
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notice(L10n::t('The solution for the captcha was incorrect'));
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$a->internalRedirect('/register');
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}
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}
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/**
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* Add the captcha to the register form
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*/
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function mathcaptcha_register_form(App $a, &$b)
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{
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$tpl = $b['template'];
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$oldPath = $tpl->filename;
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$newPath = 'addon/mathcaptcha/templates/register.tpl';
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if (strpos($oldPath, 'theme') == true)
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{
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$theme = explode('/', $oldPath)[2];
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$newThemePath = 'addon/mathcaptcha/templates/theme/'.$theme.'/register.tpl';
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if (file_exists($newThemePath)) {
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$newPath = $newThemePath;
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}
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}
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if (file_exists($newPath)) {
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$b['template'] = Renderer::getMarkupTemplate($newPath);
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$b['template']->filename = $newPath;
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}
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}
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/**
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* add template variables to the registration template
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*/
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function mathcaptcha_template_vars(App $a, &$arr)
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{
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// if the template currently processed is the register.tpl
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// add some new variables to the list of template variables
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if ($arr['template']=='register.tpl')
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{
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unset($_SESSION['mathcaptcha_n1']);
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unset($_SESSION['mathcaptcha_n2']);
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unset($_SESSION['mathcaptcha_op']);
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$num1 = rand(1, 10);
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$num2 = rand(1, 10);
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$operator = rand(0, 2);
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$_SESSION['mathcaptcha_n1'] = $num1;
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$_SESSION['mathcaptcha_n2'] = $num2;
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$_SESSION['mathcaptcha_op'] = $operator;
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$ops = ['+','-','×'];
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$task = strval($num1)." ".$ops[$operator]." ".strval($num2);
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$arr['vars'] = array_merge($arr['vars'], [
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'$captchaTitle'=>L10n::t('Captcha'),
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'$captchaDescription'=>L10n::t('In order to continue with the registration, please solve the following calculation.'),
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'$mathcaptcha'=> ['mathcaptcha', $task, '', L10n::t('You have to type in the solution of the calculation'), 'required']
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]);
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}
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}
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