recaptcha.php

<?php
/**
 * milkycode Joomla 1.5 reCaptcha plugin.
 * @author      Christian Hinz <christian@milkycode.com>
 * @category    plugins
 * @package     plugins_system
 * @copyright   Copyright (c) 2018 milkycode GmbH (http://www.milkycode.com)
 * @url         https://github.com/milkycode/joomla_recaptcha_j15
 */

defined('_JEXEC') or ('_VALID_MOS') or die('Direct Access to this location is not allowed.');

jimport('joomla.plugin.plugin');

class plgSystemRecaptcha extends JPlugin
{
    function plgSystemRecaptcha(&$subject, $config)
    {
        parent::__construct($subject, $config);

        require_once(dirname(__FILE__).'/recaptcha/api.php');
        ReCaptcha::setKeys(
            $this->params->get('public', Recaptcha::get('publicKey')),
            $this->params->get('private', Recaptcha::get('privateKey'))
        );
    }

    function processPage()
    {
        $option = JRequest::getCmd('option');
        $view = JRequest::getCmd('view');
        $task = JRequest::getCmd('task');

        if ($this->params->get('addToContact', 1) == 1 && $option == 'com_contact' && $task == 'submit') {
            return true;
        }

        return false;
    }

    function addFormToBuffer()
    {
        $option = JRequest::getCmd('option');
        $view = JRequest::getCmd('view');
        if ($this->params->get('addToContact', 1) == 1 && $option == 'com_contact' && $view == 'contact') {
            return true;
        }

        return false;
    }

    function onAfterInitialise()
    {
        ReCaptcha::process();
    }

    function onAfterRoute()
    {
        if (!$this->processPage()) {
            return;
        }
        if (ReCaptcha::get('submitted') && !ReCaptcha::get('success')) {
            JRequest::setVar('task', 'display');
            JError::raiseWarning(0, 'Please activate Captcha!'); // Bitte `Ich bin kein Roboter` anklicken!
        }
    }

    function onAfterDispatch()
    {
        if (!$this->addFormToBuffer()) {
            return;
        }
        $document =& JFactory::getDocument();
        $buffer = $document->getBuffer('component');

        // add it before the submit button
        $re = "/<(button|input)(.*type=['\"]submit['\"].*)?>/i";
        $buffer = preg_replace_callback($re, array(&$this, '_addFormCallback'), $buffer);

        // set values...
        $inputsRe = "/<input(.*name=(['\"])(.+?)\\2.*)?>/i";
        $textareaRe = "/<textarea(.*name=(['\"])text\\2.*)?>(.*)?<\/textarea>/i";

        $buffer = preg_replace_callback($inputsRe, array(&$this, '_addInputValues'), $buffer);
        $buffer = preg_replace_callback($textareaRe, array(&$this, '_addTextareaValue'), $buffer);

        $document->setBuffer($buffer, 'component');
    }

    function _addFormCallback($matches)
    {
        return ReCaptcha::get('html').'<br />'.$matches[0];
    }

    function _addInputValues($matches)
    {
        switch ($matches[3]) {
            case 'name':
            case 'email':
            case 'subject':
                $re = "/value=(['\"])(.*?)\\1/i";
                $this->_replacementValue = JRequest::getVar($matches[3]);
                $matches[0] = preg_replace_callback($re, array(&$this, '_replaceValue'), $matches[0]);
                break;
        }

        return $matches[0];
    }

    function _addTextareaValue(array $matches)
    {
        $attrs = $matches[1];
        $val = JRequest::getString('text');

        return '<textarea'.$attrs.'>'.$val.'</textarea>';
    }

    function _replaceValue($matches)
    {
        $val = addslashes($this->_replacementValue);

        return "value='$val'";
    }
}