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132
fastphp/base/Jwt.php
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132
fastphp/base/Jwt.php
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<?php
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namespace fastphp\base;
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/**
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* PHP实现jwt
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*/
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class Jwt {
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//头部
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private static $header=array(
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'alg'=>'HS256', //生成signature的算法
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'typ'=>'JWT' //类型
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);
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//使用HMAC生成信息摘要时所使用的密钥
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private static $key;
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public function __construct($key){
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self::$key = $key;
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}
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/**
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* 获取jwt token
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* @param array $payload jwt载荷 格式如下非必须
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* [
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* 'iss'=>'jwt_admin', //该JWT的签发者
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* 'iat'=>time(), //签发时间
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* 'exp'=>time()+7200, //过期时间
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* 'nbf'=>time()+60, //该时间之前不接收处理该Token
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* 'sub'=>'www.admin.com', //面向的用户
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* 'jti'=>md5(uniqid('JWT').time()) //该Token唯一标识
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* ]
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* @return bool|string
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*/
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public static function getToken(array $payload)
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{
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if(is_array($payload))
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{
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$base64header=self::base64UrlEncode(json_encode(self::$header,JSON_UNESCAPED_UNICODE));
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$base64payload=self::base64UrlEncode(json_encode($payload,JSON_UNESCAPED_UNICODE));
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$token=$base64header.'.'.$base64payload.'.'.self::signature($base64header.'.'.$base64payload,self::$key);
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return $token;
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}else{
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return false;
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}
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}
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/**
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* 验证token是否有效,默认验证exp,nbf,iat时间
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* @param string $Token 需要验证的token
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* @return bool|string
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*/
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public static function verifyToken(string $Token)
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{
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$tokens = explode('.', $Token);
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if (count($tokens) != 3)
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return false;
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list($base64header, $base64payload, $sign) = $tokens;
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//获取jwt算法
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$base64decodeheader = json_decode(self::base64UrlDecode($base64header), JSON_OBJECT_AS_ARRAY);
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if (empty($base64decodeheader['alg']))
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return false;
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//签名验证
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if (self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']) !== $sign)
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return false;
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$payload = json_decode(self::base64UrlDecode($base64payload), JSON_OBJECT_AS_ARRAY);
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//签发时间大于当前服务器时间验证失败
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if (isset($payload['iat']) && $payload['iat'] > time())
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return false;
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//过期时间小宇当前服务器时间验证失败
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if (isset($payload['exp']) && $payload['exp'] < time())
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return false;
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//该nbf时间之前不接收处理该Token
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if (isset($payload['nbf']) && $payload['nbf'] > time())
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return false;
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return $payload;
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}
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/**
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* base64UrlEncode https://jwt.io/ 中base64UrlEncode编码实现
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* @param string $input 需要编码的字符串
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* @return string
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*/
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private static function base64UrlEncode(string $input)
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{
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return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
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}
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/**
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* base64UrlEncode https://jwt.io/ 中base64UrlEncode解码实现
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* @param string $input 需要解码的字符串
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* @return bool|string
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*/
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private static function base64UrlDecode(string $input)
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{
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$remainder = strlen($input) % 4;
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if ($remainder) {
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$addlen = 4 - $remainder;
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$input .= str_repeat('=', $addlen);
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}
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return base64_decode(strtr($input, '-_', '+/'));
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}
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/**
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* HMACSHA256签名 https://jwt.io/ 中HMACSHA256签名实现
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* @param string $input 为base64UrlEncode(header).".".base64UrlEncode(payload)
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* @param string $key
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* @param string $alg 算法方式
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* @return mixed
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*/
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private static function signature(string $input, string $key, string $alg = 'HS256')
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{
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$alg_config=array(
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'HS256'=>'sha256'
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);
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return self::base64UrlEncode(hash_hmac($alg_config[$alg], $input, $key,true));
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}
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}
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