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<?php

/**
 * reCaptcha v2 handler (http://www.google.com/recaptcha)
 * 
 * Adapted from the third paryt noCaptcha reCaptcha plugin by Ben Feather (Epsilon) 
 * https://github.com/Epsilon8425/Zenphoto-noCaptcha-reCaptcha
 *
 * Note this plugin embeds the external reCaptcha JavaScript library from Google's servers
 *
 * @author Ben Feather (Epsilon), Stephen Billard (sbillard), Malte Müller (acrylian)
 * @package plugins
 * @subpackage recaptcha
 */
// force UTF-8 Ø
$plugin_is_filter = 5 | CLASS_PLUGIN;
$plugin_description = gettext("Google reCaptcha v2 handler.");
$plugin_author = "Ben Feather (Epsilon), Stephen Billard (sbillard), Malte Müller (acrylian)";
$plugin_disable = ($_zp_captcha->name && $_zp_captcha->name != 'reCaptcha') ? sprintf(gettext('Only one Captcha handler plugin may be enabled. <a href="#%1$s"><code>%1$s</code></a> is already enabled.'), $_zp_captcha->name) : '';
$plugin_notice = array(
        gettext('Google account and reCaptcha key required.'),
        gettext('Privacy note: This plugin uses external third party sources')
);
$option_interface = 'reCaptcha';
$plugin_category = gettext('Spam');

class reCaptcha extends _zp_captcha {

    var $name = 'reCaptcha';

    /**
     * Class instantiator
     *
     * @return captcha
     */
    function __construct() {
        //setOptionDefault('reCaptcha_theme', 'red');
        setOptionDefault('reCaptcha_theme', 'light');
        setOptionDefault('reCaptcha_type', 'image');
        setOptionDefault('reCaptcha_size', 'normal');
    }

    /**
     * Returns array of supported options for the admin-options handler
     *
     * @return array
     */
    function getOptionsSupported() {
        return array(
                gettext('Public key') => array(
                        'key' => 'reCaptcha_public_key',
                        'type' => OPTION_TYPE_TEXTBOX,
                        'order' => 1,
                        'desc' => gettext('Enter your <em>reCaptcha v2</em> public key. You can obtain this key from the Google <a href="http://www.google.com/recaptcha">reCaptcha</a> site')),
                gettext('Private key') => array(
                        'key' => 'reCaptcha_private_key',
                        'type' => OPTION_TYPE_TEXTBOX,
                        'order' => 2,
                        'desc' => gettext('Enter your <em>reCaptcha v2</em> private key.')),
                // Dropdown for reCaptcha theme
                gettext('Widget Theme:') => array(
                        'key' => 'reCaptcha_theme',
                        'type' => OPTION_TYPE_SELECTOR,
                        'order' => 3,
                        'selections' => array(
                                gettext('Light') => 'light',
                                gettext('Dark') => 'dark'
                        ),
                        'desc' => gettext('Choose the theme for your reCaptcha.')
                ),
                gettext('Widget Type:') => array(
                        'key' => 'reCaptcha_type',
                        'type' => OPTION_TYPE_SELECTOR,
                        'order' => 4,
                        'selections' => array(
                                gettext('Audio') => 'audio',
                                gettext('Image') => 'image'
                        ),
                        'desc' => gettext('Choose the secondary verification method you would like to use.')
                ),
                gettext('Widget Size:') => array(
                        'key' => 'reCaptcha_size',
                        'type' => OPTION_TYPE_SELECTOR,
                        'order' => 5,
                        'selections' => array(
                                gettext('Normal') => 'normal',
                                gettext('Compact') => 'compact'
                        ),
                        'desc' => gettext('Choose the size of the reCaptcha widget.')
                )
        );
    }

    /**
     * Returns HTML for reCaptcha (including required reCaptcha script)
     * 
     * @param string $publicKey The public key
     * @param string $theme The theme to use "light" or "dark"
     * @param string $type Type to use "audio" or "image"
     * @param string $size Size to use "normal" or "compact"
     * @return type
     */
    function getCaptchaHTML($publicKey, $theme, $type, $size) {
        return '<div class="g-recaptcha" data-sitekey="' . $publicKey . '" data-theme="' . $theme . '" data-type="' . $type . '" data-size="' . $size . '"></div>
                <script src="https://www.google.com/recaptcha/api.js"></script>';
    }

    /**
     * Called by form (wherever reCaptcha is enabled) on submit to check whether or not the capture has succeeded. $s1, $s2 are required.
     * 
     * @param type $s1 Not used
     * @param type $s2 Not used
     * @return boolean
     */
    function checkCaptcha($s1, $s2) {
        $secretKey = getOption('reCaptcha_private_key');
        $captcha = '';
        if(isset($_POST['g-recaptcha-response'])) {
            $captcha = sanitize($_POST['g-recaptcha-response']);
        }

        // verifies reCaptcha
        $response = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret=' . $secretKey . '&response=' . $captcha . '&remoteip=' . sanitize($_SERVER['REMOTE_ADDR']));

        // Changes response value into expected format (for return)
        if (strpos($response, 'true') == true) {
            $valid = true;
        } else {
            $valid = false;
        }
        return $valid;
    }

    /**
     * Called by form (wherever reCaptcha is enabled) to add reCaptcha widget
     * 
     * @param type $prompt
     * @return type
     */
    function getCaptcha($prompt) {
        $publicKey = getOption('reCaptcha_public_key');
        $theme = getOption('reCaptcha_theme');
        //handle outdated recaptcha v1 themes if still set
        if (!in_array($theme, array('light', 'dark'))) {
            $theme = 'light';
        }
        $type = getOption('reCaptcha_type');
        $size = getOption('reCaptcha_size');

        // Check for proper configuration of options
        if (!getOption('reCaptcha_public_key') || !getOption('reCaptcha_private_key')) {
            return array(
                    'input' => '',
                    'html' => '<div class="errorbox"><p>' . gettext('reCAPTCHA v2 keys are not configured properly. Visit <a href="https://www.google.com/recaptcha/intro/index.html">this link</a> to retrieve your reCaptcha keys.') . '</p></div>',
                    'hidden' => ''
            );
        } else {
            $html = $this->getCaptchaHTML($publicKey, $theme, $type, $size);
            return array(
                    'html' => '<label class="captcha-label">' . $prompt . '</label>',
                    'input' => $html
            );
        }
    }

}

// Required for script to be considered a reCaptcha handler
if ($plugin_disable) {
    enableExtension('reCaptcha', 0);
} else {
    $_zp_captcha = new reCaptcha(getOption('reCaptcha_private_key'));
}