<?php
/**
 * Service_Hatena_Auth
 * 
 * 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://opensource.org/licenses/bsd-license.php
 * 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@ishinao.net so we can send you a copy immediately.
 *
 * @category   Service
 * @package   Service
 * @license    http://opensource.org/licenses/bsd-license.php  New BSD License
 * 
 * Author: ishinao <ishinao@ishinao.net>
 * $Id$
 * 
 * = how to use =
 * 
 */
class Service_Hatena_Auth
{
    /**
     * 
     */
	const HATENA_AUTH_URL = 'http://auth.hatena.ne.jp/auth';
    
    /**
     * 
     */
	const HATENA_INFO_URL = 'http://auth.hatena.ne.jp/api/auth.json';

    /**
     * 
     */
	protected $_apiKey = null;
	
    /**
     * 
     */
	protected $_secretKey = null;
    
    /**
     * 
     */
    protected $_lastResult = null;
	
    /**
     * 
     */
	public function __construct($secretKey, $apiKey)
	{
		$this->_secretKey = $secretKey;
		$this->_apiKey = $apiKey;
	}
	
    /**
     * 
     */
	public function getSignInUrl($params = array())
	{
		$params['api_key'] = $this->_apiKey;
        ksort($params);
		$queries = array();
		foreach ($params as $key => $value) {
			$queries[] = rawurlencode($key) . '=' . rawurlencode($value);
		}
		$queries[] = 'api_sig=' . $this->_makeSignature($params);

		$url = self::HATENA_AUTH_URL . '?' . implode('&', $queries);
		
		return $url;
	}
	
    /**
     * 
     */
	public function getInfoUrl($cert = null)
	{
		if (empty($cert)) {$cert = isset($_GET['cert']) ? $_GET['cert'] : null;}
		$params = array(
			'api_key' => $this->_apiKey,
			'cert' => $cert,
		);
		$params['api_sig'] = $this->_makeSignature($params);
		$queries = array();
		foreach ($params as $key => $value) {
			$queries[] = rawurlencode($key) . '=' . rawurlencode($value);
		}
		
		$url = self::HATENA_INFO_URL . '?' . implode('&', $queries);
		
		return $url;
	}
	
    /**
     * 
     */
	public function validate($cert = null)
	{
		$url = $this->getInfoUrl($cert);
		$json = file_get_contents($url);

		require_once 'Zend/Json.php';
		$this->_lastResult = Zend_Json::decode($json);

		if (isset($this->_lastResult['has_error']) && ($this->_lastResult['has_error'] == false)) {
            return true;
        }
        return false;
	}
    
    /**
     * 
     */
    public function getName()
    {
        if (isset($this->_lastResult['user']['name'])) {
            return $this->_lastResult['user']['name'];
        }
    }
    
    /**
     * 
     */
    public function getLastResult()
    {
        return $this->_lastResult;
    }
	
    /**
     * 
     */
	protected function _makeSignature($params)
	{
		ksort($params);
		$message = '';
		foreach ($params as $key => $value) {
			$message .= $key . $value;
		}
		$message = $this->_secretKey . $message;
		$sig = md5($message);
		
		return $sig;
	}
}