<?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_Auth
 * @subpackage Zend_Auth_Adapter
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: InfoCard.php 16200 2009-06-21 18:50:06Z thomas $
 */

/**
 * @see Zend_Auth_Adapter_Interface
 */
require_once 'Zend/Auth/Adapter/Interface.php';

/**
 * @see Zend_Auth_Result
 */
require_once 'Zend/Auth/Result.php';

/**
 * @see Zend_InfoCard
 */
require_once 'Zend/InfoCard.php';

/**
 * A Zend_Auth Authentication Adapter allowing the use of Information Cards as an
 * authentication mechanism
 *
 * @category   Zend
 * @package    Zend_Auth
 * @subpackage Zend_Auth_Adapter
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Auth_Adapter_InfoCard implements Zend_Auth_Adapter_Interface
{
    /**
     * The XML Token being authenticated
     *
     * @var string
     */
    protected $_xmlToken;

    /**
     * The instance of Zend_InfoCard
     *
     * @var Zend_InfoCard
     */
    protected $_infoCard;

    /**
     * Constructor
     *
     * @param  string $strXmlDocument The XML Token provided by the client
     * @return void
     */
    public function __construct($strXmlDocument)
    {
        $this->_xmlToken = $strXmlDocument;
        $this->_infoCard = new Zend_InfoCard();
    }

    /**
     * Sets the InfoCard component Adapter to use
     *
     * @param  Zend_InfoCard_Adapter_Interface $a
     * @return Zend_Auth_Adapter_InfoCard Provides a fluent interface
     */
    public function setAdapter(Zend_InfoCard_Adapter_Interface $a)
    {
        $this->_infoCard->setAdapter($a);
        return $this;
    }

    /**
     * Retrieves the InfoCard component adapter being used
     *
     * @return Zend_InfoCard_Adapter_Interface
     */
    public function getAdapter()
    {
        return $this->_infoCard->getAdapter();
    }

    /**
     * Retrieves the InfoCard public key cipher object being used
     *
     * @return Zend_InfoCard_Cipher_PKI_Interface
     */
    public function getPKCipherObject()
    {
        return $this->_infoCard->getPKCipherObject();
    }

    /**
     * Sets the InfoCard public key cipher object to use
     *
     * @param  Zend_InfoCard_Cipher_PKI_Interface $cipherObj
     * @return Zend_Auth_Adapter_InfoCard Provides a fluent interface
     */
    public function setPKICipherObject(Zend_InfoCard_Cipher_PKI_Interface $cipherObj)
    {
        $this->_infoCard->setPKICipherObject($cipherObj);
        return $this;
    }

    /**
     * Retrieves the Symmetric cipher object being used
     *
     * @return Zend_InfoCard_Cipher_Symmetric_Interface
     */
    public function getSymCipherObject()
    {
        return $this->_infoCard->getSymCipherObject();
    }

    /**
     * Sets the InfoCard symmetric cipher object to use
     *
     * @param  Zend_InfoCard_Cipher_Symmetric_Interface $cipherObj
     * @return Zend_Auth_Adapter_InfoCard Provides a fluent interface
     */
    public function setSymCipherObject(Zend_InfoCard_Cipher_Symmetric_Interface $cipherObj)
    {
        $this->_infoCard->setSymCipherObject($cipherObj);
        return $this;
    }

    /**
     * Remove a Certificate Pair by Key ID from the search list
     *
     * @param  string $key_id The Certificate Key ID returned from adding the certificate pair
     * @throws Zend_InfoCard_Exception
     * @return Zend_Auth_Adapter_InfoCard Provides a fluent interface
     */
    public function removeCertificatePair($key_id)
    {
        $this->_infoCard->removeCertificatePair($key_id);
        return $this;
    }

    /**
     * Add a Certificate Pair to the list of certificates searched by the component
     *
     * @param  string $private_key_file    The path to the private key file for the pair
     * @param  string $public_key_file     The path to the certificate / public key for the pair
     * @param  string $type                (optional) The URI for the type of key pair this is (default RSA with OAEP padding)
     * @param  string $password            (optional) The password for the private key file if necessary
     * @throws Zend_InfoCard_Exception
     * @return string A key ID representing this key pair in the component
     */
    public function addCertificatePair($private_key_file, $public_key_file, $type = Zend_InfoCard_Cipher::ENC_RSA_OAEP_MGF1P, $password = null)
    {
        return $this->_infoCard->addCertificatePair($private_key_file, $public_key_file, $type, $password);
    }

    /**
     * Return a Certificate Pair from a key ID
     *
     * @param  string $key_id The Key ID of the certificate pair in the component
     * @throws Zend_InfoCard_Exception
     * @return array An array containing the path to the private/public key files,
     *               the type URI and the password if provided
     */
    public function getCertificatePair($key_id)
    {
        return $this->_infoCard->getCertificatePair($key_id);
    }

    /**
     * Set the XML Token to be processed
     *
     * @param  string $strXmlToken The XML token to process
     * @return Zend_Auth_Adapter_InfoCard Provides a fluent interface
     */
    public function setXmlToken($strXmlToken)
    {
        $this->_xmlToken = $strXmlToken;
        return $this;
    }

    /**
     * Get the XML Token being processed
     *
     * @return string The XML token to be processed
     */
    public function getXmlToken()
    {
        return $this->_xmlToken;
    }

    /**
     * Authenticates the XML token
     *
     * @return Zend_Auth_Result The result of the authentication
     */
    public function authenticate()
    {
        try {
            $claims = $this->_infoCard->process($this->getXmlToken());
        } catch(Exception $e) {
            return new Zend_Auth_Result(Zend_Auth_Result::FAILURE , null, array('Exception Thrown',
                                                                                $e->getMessage(),
                                                                                $e->getTraceAsString(),
                                                                                serialize($e)));
        }

        if(!$claims->isValid()) {
            switch($claims->getCode()) {
                case Zend_infoCard_Claims::RESULT_PROCESSING_FAILURE:
                    return new Zend_Auth_Result(
                        Zend_Auth_Result::FAILURE,
                        $claims,
                        array(
                            'Processing Failure',
                            $claims->getErrorMsg()
                        )
                    );
                    break;
                case Zend_InfoCard_Claims::RESULT_VALIDATION_FAILURE:
                    return new Zend_Auth_Result(
                        Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID,
                        $claims,
                        array(
                            'Validation Failure',
                            $claims->getErrorMsg()
                        )
                    );
                    break;
                default:
                    return new Zend_Auth_Result(
                        Zend_Auth_Result::FAILURE,
                        $claims,
                        array(
                            'Unknown Failure',
                            $claims->getErrorMsg()
                        )
                    );
                    break;
            }
        }

        return new Zend_Auth_Result(
            Zend_Auth_Result::SUCCESS,
            $claims
        );
    }
}