<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Service

 * @subpackage ReCaptcha

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

/** @see Zend_Service_Abstract */

require_once 'Zend/Service/Abstract.php';

/** @see Zend_Json */

require_once 'Zend/Json.php';

/** @see Zend_Service_ReCaptcha_Response */

require_once 'Zend/Service/ReCaptcha/Response.php';

/**

 * Zend_Service_ReCaptcha

 *

 * @category   Zend

 * @package    Zend_Service

 * @subpackage ReCaptcha

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: ReCaptcha.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

class Zend_Service_ReCaptcha extends Zend_Service_Abstract

{

    /**

     * URI to the regular API

     *

     * @var string

     */

    const API_SERVER = 'http://api.recaptcha.net';

    /**

     * URI to the secure API

     *

     * @var string

     */

    const API_SECURE_SERVER = 'https://api-secure.recaptcha.net';

    /**

     * URI to the verify server

     *

     * @var string

     */

    const VERIFY_SERVER = 'http://api-verify.recaptcha.net/verify';

    /**

     * Public key used when displaying the captcha

     *

     * @var string

     */

    protected $_publicKey = null;

    /**

     * Private key used when verifying user input

     *

     * @var string

     */

    protected $_privateKey = null;

    /**

     * Ip address used when verifying user input

     *

     * @var string

     */

    protected $_ip = null;

    /**

     * Parameters for the object

     *

     * @var array

     */

    protected $_params = array(

        'ssl' => false, /* Use SSL or not when generating the recaptcha */

        'error' => null, /* The error message to display in the recaptcha */

        'xhtml' => false /* Enable XHTML output (this will not be XHTML Strict

                            compliant since the IFRAME is necessary when

                            Javascript is disabled) */

    );

    /**

     * Options for tailoring reCaptcha

     *

     * See the different options on http://recaptcha.net/apidocs/captcha/client.html

     *

     * @var array

     */

    protected $_options = array(

        'theme' => 'red',

        'lang' => 'en',

    );

    /**

     * Response from the verify server

     *

     * @var Zend_Service_ReCaptcha_Response

     */

    protected $_response = null;

    /**

     * Class constructor

     *

     * @param string $publicKey

     * @param string $privateKey

     * @param array $params

     * @param array $options

     * @param string $ip

     * @param array|Zend_Config $params

     */

    public function __construct($publicKey = null, $privateKey = null,

                                $params = null, $options = null, $ip = null)

    {

        if ($publicKey !== null) {

            $this->setPublicKey($publicKey);

        }

        if ($privateKey !== null) {

            $this->setPrivateKey($privateKey);

        }

        if ($ip !== null) {

            $this->setIp($ip);

        } else if (isset($_SERVER['REMOTE_ADDR'])) {

            $this->setIp($_SERVER['REMOTE_ADDR']);

        }

        if ($params !== null) {

            $this->setParams($params);

        }

        if ($options !== null) {

            $this->setOptions($options);

        }

    }

    /**

     * Serialize as string

     *

     * When the instance is used as a string it will display the recaptcha.

     * Since we can't throw exceptions within this method we will trigger

     * a user warning instead.

     *

     * @return string

     */

    public function __toString()

    {

        try {

            $return = $this->getHtml();

        } catch (Exception $e) {

            $return = '';

            trigger_error($e->getMessage(), E_USER_WARNING);

        }

        return $return;

    }

    /**

     * Set the ip property

     *

     * @param string $ip

     * @return Zend_Service_ReCaptcha

     */

    public function setIp($ip)

    {

        $this->_ip = $ip;

        return $this;

    }

    /**

     * Get the ip property

     *

     * @return string

     */

    public function getIp()

    {

        return $this->_ip;

    }

    /**

     * Set a single parameter

     *

     * @param string $key

     * @param string $value

     * @return Zend_Service_ReCaptcha

     */

    public function setParam($key, $value)

    {

        $this->_params[$key] = $value;

        return $this;

    }

    /**

     * Set parameters

     *

     * @param array|Zend_Config $params

     * @return Zend_Service_ReCaptcha

     * @throws Zend_Service_ReCaptcha_Exception

     */

    public function setParams($params)

    {

        if ($params instanceof Zend_Config) {

            $params = $params->toArray();

        }

        if (is_array($params)) {

            foreach ($params as $k => $v) {

                $this->setParam($k, $v);

            }

        } else {

            /** @see Zend_Service_ReCaptcha_Exception */

            require_once 'Zend/Service/ReCaptcha/Exception.php';

            throw new Zend_Service_ReCaptcha_Exception(

                'Expected array or Zend_Config object'

            );

        }

        return $this;

    }

    /**

     * Get the parameter array

     *

     * @return array

     */

    public function getParams()

    {

        return $this->_params;

    }

    /**

     * Get a single parameter

     *

     * @param string $key

     * @return mixed

     */

    public function getParam($key)

    {

        return $this->_params[$key];

    }

    /**

     * Set a single option

     *

     * @param string $key

     * @param string $value

     * @return Zend_Service_ReCaptcha

     */

    public function setOption($key, $value)

    {

        $this->_options[$key] = $value;

        return $this;

    }

    /**

     * Set options

     *

     * @param array|Zend_Config $options

     * @return Zend_Service_ReCaptcha

     * @throws Zend_Service_ReCaptcha_Exception

     */

    public function setOptions($options)

    {

        if ($options instanceof Zend_Config) {

            $options = $options->toArray();

        }

        if (is_array($options)) {

            foreach ($options as $k => $v) {

                $this->setOption($k, $v);

            }

        } else {

            /** @see Zend_Service_ReCaptcha_Exception */

            require_once 'Zend/Service/ReCaptcha/Exception.php';

            throw new Zend_Service_ReCaptcha_Exception(

                'Expected array or Zend_Config object'

            );

        }

        return $this;

    }

    /**

     * Get the options array

     *

     * @return array

     */

    public function getOptions()

    {

        return $this->_options;

    }

    /**

     * Get a single option

     *

     * @param string $key

     * @return mixed

     */

    public function getOption($key)

    {

        return $this->_options[$key];

    }

    /**

     * Get the public key

     *

     * @return string

     */

    public function getPublicKey()

    {

        return $this->_publicKey;

    }

    /**

     * Set the public key

     *

     * @param string $publicKey

     * @return Zend_Service_ReCaptcha

     */

    public function setPublicKey($publicKey)

    {

        $this->_publicKey = $publicKey;

        return $this;

    }

    /**

     * Get the private key

     *

     * @return string

     */

    public function getPrivateKey()

    {

        return $this->_privateKey;

    }

    /**

     * Set the private key

     *

     * @param string $privateKey

     * @return Zend_Service_ReCaptcha

     */

    public function setPrivateKey($privateKey)

    {

        $this->_privateKey = $privateKey;

        return $this;

    }

    /**

     * Get the HTML code for the captcha

     *

     * This method uses the public key to fetch a recaptcha form.

     *

     * @return string

     * @throws Zend_Service_ReCaptcha_Exception

     */

    public function getHtml()

    {

        if ($this->_publicKey === null) {

            /** @see Zend_Service_ReCaptcha_Exception */

            require_once 'Zend/Service/ReCaptcha/Exception.php';

            throw new Zend_Service_ReCaptcha_Exception('Missing public key');

        }

        $host = self::API_SERVER;

        if ((bool) $this->_params['ssl'] === true) {

            $host = self::API_SECURE_SERVER;

        }

        $htmlBreak = '<br>';

        $htmlInputClosing = '>';

        if ((bool) $this->_params['xhtml'] === true) {

            $htmlBreak = '<br />';

            $htmlInputClosing = '/>';

        }

        $errorPart = '';

        if (!empty($this->_params['error'])) {

            $errorPart = '&error=' . urlencode($this->_params['error']);

        }

        $reCaptchaOptions = '';

        if (!empty($this->_options)) {

            $encoded = Zend_Json::encode($this->_options);

            $reCaptchaOptions = <<<SCRIPT

<script type="text/javascript">

    var RecaptchaOptions = {$encoded};

</script>

SCRIPT;

        }

        $return = $reCaptchaOptions;

        $return .= <<<HTML

<script type="text/javascript"

   src="{$host}/challenge?k={$this->_publicKey}{$errorPart}">

</script>

HTML;

        $return .= <<<HTML

<noscript>

   <iframe src="{$host}/noscript?k={$this->_publicKey}{$errorPart}"

       height="300" width="500" frameborder="0"></iframe>{$htmlBreak}

   <textarea name="recaptcha_challenge_field" rows="3" cols="40">

   </textarea>

   <input type="hidden" name="recaptcha_response_field"

       value="manual_challenge"{$htmlInputClosing}

</noscript>

HTML;

        return $return;

    }

    /**

     * Post a solution to the verify server

     *

     * @param string $challengeField

     * @param string $responseField

     * @return Zend_Http_Response

     * @throws Zend_Service_ReCaptcha_Exception

     */

    protected function _post($challengeField, $responseField)

    {

        if ($this->_privateKey === null) {

            /** @see Zend_Service_ReCaptcha_Exception */

            require_once 'Zend/Service/ReCaptcha/Exception.php';

            throw new Zend_Service_ReCaptcha_Exception('Missing private key');

        }

        if ($this->_ip === null) {

            /** @see Zend_Service_ReCaptcha_Exception */

            require_once 'Zend/Service/ReCaptcha/Exception.php';

            throw new Zend_Service_ReCaptcha_Exception('Missing ip address');

        }

        if (empty($challengeField)) {