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<?php
require_once 'src/JWT.php';
header('Content-type:application/json');
//定義Key
const KEY = 'dasjdkashdwqe1213dsfsn;p';

$user = [
  'uid'=>'dadsa-12312-vsd1s1-fsds',
  'account'=>'daisc',
  'password'=>'123456'
];
$redis = redis();
$action = $_GET['action'];
switch ($action)
{
  case 'login':
    login();
    break;
  case 'info':
    info();
    break;

}
//登陸，寫入驗證token
function login()
{
  global $user;
  $account = $_GET['account'];
  $pwd = $_GET['password'];
  $res = [];
  if($account==$user['account']&&$pwd==$user['password'])
  {
    unset($user['password']);
    $time = time();
    $token = [
      'iss'=>'http://test.cc',//簽發者
      'iat'=>$time,
      'exp'=>$time+60,
      'data'=>$user
    ];
    $jwt = \Firebase\JWT\JWT::encode($token,KEY);
    $res['code'] = 200;
    $res['message'] = '登錄成功';
    $res['jwt'] = $jwt;

  }
  else
  {
    $res['message']= '用戶名或密碼錯誤';
    $res['code'] = 401;
  }
  exit(json_encode($res));
}

function info()
{
  $jwt = $_SERVER['HTTP_AUTHORIZATION'] ?? false;
  $res['code'] = 200;
  if($jwt)
  {
    $jwt = str_replace('Bearer ','',$jwt);
    if(empty($jwt))
    {
      $res['code'] = 401;
      $res['msg'] = 'You do not have permission to access.';
      exit(json_encode($res));
    }
    try{
      $token = (array) \Firebase\JWT\JWT::decode($jwt,KEY, ['HS256']);
      if($token['exp']<time())
      {
        $res['code'] = 401;
        $res['msg'] = '登錄超時，請重新登錄';
      }
      $res['data']= $token['data'];
    }catch (\Exception $E)
    {
      $res['code'] = 401;
      $res['msg'] = '登錄超時，請重新登錄.';
    }
  }
  else
  {
    $res['code'] = 401;
    $res['msg'] = 'You do not have permission to access.';
  }
  exit(json_encode($res));
}

//連接redis
function redis()
{
  $redis = new Redis();
  $redis->connect('127.0.0.1');
  return $redis;
}

  public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)
  {
    $header = array('typ' => 'JWT', 'alg' => $alg);
    if ($keyId !== null) {
      $header['kid'] = $keyId;
    }
    if ( isset($head) && is_array($head) ) {
      $header = array_merge($head, $header);
    }
    $segments = array();
    $segments[] = static::urlsafeB64Encode(static::jsonEncode($header));
    $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));
    $signing_input = implode('.', $segments);

    $signature = static::sign($signing_input, $key, $alg);
    $segments[] = static::urlsafeB64Encode($signature);

    return implode('.', $segments);
  }

 $token  = [
      #非必須。issuer 請求實體，可以是發起請求的用戶的信息，也可是jwt的簽發者。
      "iss"    => "http://example.org",
      #非必須。issued at。 token創建時間，unix時間戳格式
      "iat"    => $_SERVER['REQUEST_TIME'],
      #非必須。expire 指定token的生命周期。unix時間戳格式
      "exp"    => $_SERVER['REQUEST_TIME'] + 7200,
      #非必須。接收該JWT的一方。
      "aud"    => "http://example.com",
      #非必須。該JWT所面向的用戶
      "sub"    => "jrocket@example.com",
      # 非必須。not before。如果當前時間在nbf里的時間之前，則Token不被接受；一般都會留一些余地，比如幾分鐘。
      "nbf"    => 1357000000,
      # 非必須。JWT ID。針對當前token的唯一標識
      "jti"    => '222we',
      # 自定義字段
      "GivenName" => "Jonny",
      # 自定義字段
      "name"  => "Rocket",
      # 自定義字段
      "Email"   => "jrocket@example.com",
     
    ];