<?phpnamespace app\index\controller;use think\Db;use think\Session;use think\Controller;//跨域处理header('Access-Control-Allow-Origin:*');header('Access-Control-Allow-Method:POST,GET,OPTIONS');header("Access-Control-Allow-Origin:*");header("Access-Control-Allow-Credentials:true");header("Access-Control-Allow-Methods:*");header("Access-Control-Allow-Headers:Content-Type,Access-Token");header("Access-Control-Expose-Headers:*");class Message extends Controller｛
//头部private static $header=array( 'alg'=>'HS256', //生成signature的算法 'typ'=>'JWT' //类型);//使用HMAC生成信息摘要时所使用的密钥private static $key='123456';/** * 获取jwt token * @param array $payload jwt载荷 格式如下非必须 * [ * 'iss'=>'jwt_admin', //该JWT的签发者 * 'iat'=>time(), //签发时间 * 'exp'=>time()+7200, //过期时间 * 'nbf'=>time()+60, //该时间之前不接收处理该Token * 'sub'=>'www.admin.com', //面向的用户 * 'jti'=>md5(uniqid('JWT').time()) //该Token唯一标识 * ] * @return bool|string */public static function getToken(array $payload){ if(is_array($payload)) { $base64header=self::base64UrlEncode(json_encode(self::$header,JSON_UNESCAPED_UNICODE)); $base64payload=self::base64UrlEncode(json_encode($payload,JSON_UNESCAPED_UNICODE)); $token=$base64header.'.'.$base64payload.'.'.self::signature($base64header.'.'.$base64payload,self::$key,self::$header['alg']); return $token; }else{ return false; }}/** * 验证token是否有效,默认验证exp,nbf,iat时间 * @param string $Token 需要验证的token * @return bool|string */public static function verifyToken(string $Token){ $tokens = explode('.', $Token); if (count($tokens) != 3) return false; list($base64header, $base64payload, $sign) = $tokens; //获取jwt算法 $base64decodeheader = json_decode(self::base64UrlDecode($base64header), true);//JSON_OBJECT_AS_ARRAY 相当于 true if (empty($base64decodeheader['alg'])) return false; //签名验证 if (self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']) !== $sign) { return false; } $payload = json_decode(self::base64UrlDecode($base64payload), true); //签发时间大于当前服务器时间验证失败 if (isset($payload['iat']) && $payload['iat'] > time()) { return false; } //过期时间小宇当前服务器时间验证失败 if (isset($payload['exp']) && $payload['exp'] < time()) { return false; } //该nbf时间之前不接收处理该Token if (isset($payload['nbf']) && $payload['nbf'] > time()){ return false; } return $payload;}/** * base64UrlEncode https://jwt.io/ 中base64UrlEncode编码实现 * @param string $input 需要编码的字符串 * @return string */private static function base64UrlEncode(string $input){ return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));}/** * base64UrlEncode https://jwt.io/ 中base64UrlEncode解码实现 * @param string $input 需要解码的字符串 * @return bool|string */private static function base64UrlDecode(string $input){ $remainder = strlen($input) % 4; if ($remainder) { $addlen = 4 - $remainder; $input .= str_repeat('=', $addlen); } return base64_decode(strtr($input, '-_', '+/'));}/** * HMACSHA256签名 https://jwt.io/ 中HMACSHA256签名实现 * @param string $input 为base64UrlEncode(header).".".base64UrlEncode(payload) * @param string $key * @param string $alg 算法方式 * @return mixed */private static function signature(string $input, string $key, string $alg = 'HS256'){ $alg_config=array( 'HS256'=>'sha256' ); return self::base64UrlEncode(hash_hmac($alg_config[$alg], $input, $key,true));}//获取tokenpublic function Token($array){ $token_test = self::getToken($array); return $token_test;}//验证tokenpublic function token_yz($token_test){ //对token进行验证签名 $getPayload_test=self::verifyToken($token_test); return $getPayload_test;}
//用户登录 简单模拟实例public function Login(){ $info = request()->param(); if(!isset($info['name']) or !isset($info['password'])){ return json_encode(array( 'code'=>0, 'msg'=>"缺少参数" ));die(); } //验证是否存在 $user = Db::table("user_login")->where(['name'=>$info['name'],'password'=>md5($info['password']),'is_delete'=>0])->find(); if($user){ //获取生成的token（参数） $token = $this->Token(array('uid'=>$user['id'],'name'=>$user['name'],'exp'=>time()+60,'nbf'=>time(),'jti'=>md5(uniqid('JWT').time()))); return json_encode(array( 'uid' => $user['id'], 'name' => $user['name'], 'token' => $token ));die(); } return json_encode(array( 'code'=>0, 'msg'=>"账号或密码输入有误" ));die();}
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