JWT.net 操作实践方法

1.JWT定义

JWT(Json Web Token)是一种用于双方之间传递安全信息的简洁的、URL安全的表述性声明规范。JWT作为一个开放的标准( RFC 7519 ),定义了一种简洁的,自包含的方法用于通信双方之间以Json对象的形式安全的传递信息。因为数字签名的存在,这些信息是可信的,JWT可以使用HMAC算法或者是RSA的公私秘钥对进行签名。

2.JWT的组成部分

(1)JWT一般由三段构成,用.号分隔开,第一段是header,第二段是payload,第三段是signature,

例如:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ

3.Jwt.Net 使用

首先,需要先引入Jwt.Net,可通过nuget的方式添加:Install-Package JWT -Version 2.4.2(自己选择合适的版本)

(1)创建token,此处,我们只需要自定义payload和secrect密钥即可,可生成三段格式的字符串

var payload = new Dictionary<string, object>

{

{ "claim1", 0 },

{ "claim2", "claim2-value" }

};

var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";

IJwtAlgorithm algorithm = new HMACSHA256Algorithm();

IJsonSerializer serializer = new JsonNetSerializer();

IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();

IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);

var token = encoder.Encode(payload, secret);

Console.WriteLine(token);

(2)token解密,可看到输出为{ "claim1": 0, "claim2": "claim2-value" },可以用json["claim1"],json["claim2"]的方式获取各个值,此处json为IDictionary<string,object>类型token解密,可看到输出为{ "claim1": 0, "claim2": "claim2-value" },可以用json["claim1"],json["claim2"]的方式获取各个值,此处json为IDictionary<string,object>类型

var token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJjbGFpbTEiOjAsImNsYWltMiI6ImNsYWltMi12YWx1ZSJ9.8pwBI_HtXqI3UgQHQ_rDRnSQRxFL1SR8fbQoS-5kM5s";

var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";

try

{

IJsonSerializer serializer = new JsonNetSerializer();

IDateTimeProvider provider = new UtcDateTimeProvider();

IJwtValidator validator = new JwtValidator(serializer, provider);

IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();

IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder);

var json = decoder.Decode(token, secret, verify: true);

Console.WriteLine(json);

}

catch (TokenExpiredException)

{

Console.WriteLine("Token has expired");

}

catch (SignatureVerificationException)

{

Console.WriteLine("Token has invalid signature");

}

(3)添加过期时间,过期时间即这个时间之后JWT不接受处理,时间的有效值为某一时刻和1970/1/1 00:00:00 相差的秒数

下面的例子是当前时间到1970/1/1 00:00:00 的秒数,即过期时间为当前时间。如果设置为当前时间+10秒,可添加secondsSinceEpoch=secondsSinceEpoch+10

IDateTimeProvider provider = new UtcDateTimeProvider();

var now = provider.GetNow();

var unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc); // or use JwtValidator.UnixEpoch

var secondsSinceEpoch = Math.Round((now - unixEpoch).TotalSeconds);

var payload = new Dictionary<string, object>

{

{ "exp", secondsSinceEpoch }

};

var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";

var token = encoder.Encode(payload, secret);

var json = decoder.Decode(token, secret); // TokenExpiredException

(4)也可自定义json解析器,只要继承IJsonSerializer接口

public class CustomJsonSerializer : IJsonSerializer

{

public string Serialize(object obj)

{

// Implement using favorite JSON Serializer

}

public T Deserialize<T>(string json)

{

// Implement using favorite JSON Serializer

}

}

使用该解析器

IJwtAlgorithm algorithm = new HMACSHA256Algorithm();

IJsonSerializer serializer = new CustomJsonSerializer();

IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();

IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);

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