DooDigestAuth php（后台）授权管理类 web浏览器授权

 <?php
 /**
  * DooDigestAuth class file.
  *
  * @author Leng Sheng Hong <darkredz@gmail.com>
  * @link http://www.doophp.com/
  * @copyright Copyright &copy; 2009 Leng Sheng Hong
  * @license http://www.doophp.com/license
  */

 /**
  * Handles HTTP digest authentication
  *
  * <p>HTTP digest authentication can be used with the URI router.
  * HTTP digest is much more recommended over the use of HTTP Basic auth which doesn't provide any encryption.
  * If you are running PHP on Apache in CGI/FastCGI mode, you would need to
  * add the following line to your .htaccess for digest auth to work correctly.</p>
  * <code>RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]</code>
  *
  * <p>This class is tested under Apache 2.2 and Cherokee web server. It should work in both mod_php and cgi mode.</p>
  *
  * @author Leng Sheng Hong <darkredz@gmail.com>
  * @version $Id: DooDigestAuth.php 1000 2009-07-7 18:27:22
  * @package doo.auth
  * @since 1.0
  */
 class DooDigestAuth{

     /**
      * Authenticate against a list of username and passwords.
      *
      * <p>HTTP Digest Authentication doesn't work with PHP in CGI mode,
      * you have to add this into your .htaccess <code>RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]</code></p>
      *
      * @param string $realm Name of the authentication session
      * @param array $users An assoc array of username and password: array('uname1'=>'pwd1', 'uname2'=>'pwd2')
      * @param string $fail_msg Message to be displayed if the User cancel the login
      * @param string $fail_url URL to be redirect if the User cancel the login
      * @return string The username if login success.
      */
     public static function http_auth($realm, $users, $fail_msg=NULL, $fail_url=NULL){
         $realm = "Restricted area - $realm";

         //user => password
         //$users = array('admin' => '1234', 'guest' => 'guest');
         if(!empty($_SERVER['REDIRECT_HTTP_AUTHORIZATION']) && strpos($_SERVER['REDIRECT_HTTP_AUTHORIZATION'], 'Digest')===0){
             $_SERVER['PHP_AUTH_DIGEST'] = $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
         }

         if (empty($_SERVER['PHP_AUTH_DIGEST'])) {
             header('WWW-Authenticate: Digest realm="'.$realm.
                    '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
             header('HTTP/1.1 401 Unauthorized');
             if($fail_msg!=NULL)
                 die($fail_msg);
             if($fail_url!=NULL)
                 die("<script>window.location.href = '$fail_url'</script>");
             exit;
         }

         // analyze the PHP_AUTH_DIGEST variable
         if (!($data = self::http_digest_parse($_SERVER['PHP_AUTH_DIGEST'])) || !isset($users[$data['username']])){
             header('WWW-Authenticate: Digest realm="'.$realm.
                    '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
             header('HTTP/1.1 401 Unauthorized');
             if($fail_msg!=NULL)
                 die($fail_msg);
             if($fail_url!=NULL)
                 die("<script>window.location.href = '$fail_url'</script>");
             exit;
         }

         // generate the valid response
         $A1 = md5($data['username'] . ':' . $realm . ':' . $users[$data['username']]);
         $A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
         $valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);

         if ($data['response'] != $valid_response){
             header('HTTP/1.1 401 Unauthorized');
             header('WWW-Authenticate: Digest realm="'.$realm.
                    '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
             if($fail_msg!=NULL)
                 die($fail_msg);
             if($fail_url!=NULL)
                 die("<script>window.location.href = '$fail_url'</script>");
             exit;
         }

         // ok, valid username & password
         return $data['username'];
     }

     /**
      * Method to parse the http auth header, works with IE.
      *
      * Internet Explorer returns a qop="xxxxxxxxxxx" in the header instead of qop=xxxxxxxxxxx as most browsers do.
      *
      * @param string $txt header string to parse
      * @return array An assoc array of the digest auth session
      */
     private static function http_digest_parse($txt)
     {
         $res = preg_match("/username=\"([^\"]+)\"/i", $txt, $match);
         $data['username'] = (isset($match[1]))?$match[1]:null;
         $res = preg_match('/nonce=\"([^\"]+)\"/i', $txt, $match);
         $data['nonce'] = $match[1];
         $res = preg_match('/nc=([0-9]+)/i', $txt, $match);
         $data['nc'] = $match[1];
         $res = preg_match('/cnonce=\"([^\"]+)\"/i', $txt, $match);
         $data['cnonce'] = $match[1];
         $res = preg_match('/qop=([^,]+)/i', $txt, $match);
         $data['qop'] = str_replace('"','',$match[1]);
         $res = preg_match('/uri=\"([^\"]+)\"/i', $txt, $match);
         $data['uri'] = $match[1];
         $res = preg_match('/response=\"([^\"]+)\"/i', $txt, $match);
         $data['response'] = $match[1];
         return $data;
     }

 }

调用方法:

 require_once(dirname(__FILE__)."/DooDigestAuth.php");
 DooDigestAuth::http_auth('example.com', array('admin'=>"123456789"));

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