<?php
//unset($_SERVER['PHP_AUTH_DIGEST']);

$username = 'xingdong'; //用户名
$userpass = '123456'; //面膜
$secret = 'xingdong365'; //秘钥

$realm = '401test';

$opaque = md5($secret.$_SERVER['HTTP_USER_AGENT'].$_SERVER['REMOTE_ADDR']);

if (!isset($_SERVER['PHP_AUTH_DIGEST']) || empty($_SERVER['PHP_AUTH_DIGEST'])) {
    header('HTTP/1.1 401 Unauthorized');
    header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth",nonce="'.uniqid().'",opaque="'.$opaque.'"');
    die;
}

$needed_parts = array(
    'nonce'    =>1,
    'nc'       => 1,
    'cnonce'   => 1,
    'qop'      =>1,
    'username' =>1,
    'uri'      =>1,
    'response' =>1
);

$data = array();
$keys = implode('|', array_keys($needed_parts));

preg_match_all('/('.$keys.')=(?:([\'"])([^\2]+?)\2|([^\s,]+))/', $_SERVER['PHP_AUTH_DIGEST'], $matches, PREG_SET_ORDER);

foreach ($matches as $m) {
    $data[$m[1]] = $m[3] ? $m[3] : $m[4];
    unset($needed_parts[$m[1]]);
}

//检测用户名
if ($data['username'] != $username){
    header('HTTP/1.1 401 Unauthorized');
    header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth",nonce="'.uniqid().'",opaque="'.$opaque.'"');
    die('Invalid username.');
}

$password = md5($username.':'.$realm.':'.$userpass);
$response = md5($password.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']));

if ($data['response'] != $response) {
    header('HTTP/1.1 401 Unauthorized');
    header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth",nonce="'.uniqid().'",opaque="'.$opaque.'"');
    die('Invalid password.');
}

echo "success";