是否有针对aws cognito API的JWT验证的java示例？

我使用的是aws cognito用户池，在用户登录后，我在单页应用程序中获得了一个id令牌，这是预期的，然后对于每个请求，我需要在我的后端rest API中验证id令牌，它是java的，aws文档没有太多提到如何做

有什么例子吗

混淆包括：

id令牌似乎不仅仅是一个签名的JWT，它也是加密的，当使用nimbus库时，我需要为加密的JWT指定一个秘密，我在哪里可以获得这个秘密？我的理解是这应该来自aws，我是否需要下载一些东西然后放入jvm密钥库

有一个著名的jwts.json可以从aws下载，它看起来像：

`

`

如何理解这一点，每个属性用于什么？用户池中的每个用户都代表一个密钥吗

是否有任何用于aws cognito服务验证的示例java代码，我可以使用aws sdk还是必须使用像nimbus这样的库来自己进行验证

---

您可以使用标准验证令牌。此外，验证JWT令牌还涉及几个步骤。虽然我找不到Java示例，但下面是一个NodeJS示例，它将解释验证过程

const jwt = require('jsonwebtoken');
const jwtToken = "sampletoken****";
const jwkPem = { "alg" : "RS256", "kid" : "samplekid****" }

var decodedJwt = jwt.decode(jwtToken, {complete: true});

//Fail if the token is not jwt
if (!decodedJwt) {
    console.log("Not a valid JWT token");
    return;
}

//Fail if token is not from your User Pool
if (decodedJwt.payload.iss != iss) {
    console.log("invalid issuer");
    return;
}

//Reject the jwt if it's not an 'Access Token'
if (!(decodedJwt.payload.token_use == 'id' || 
    decodedJwt.payload.token_use == 'access')) {
    console.log("token_use is invalid");
    return;
}

//Get the kid from the token and retrieve corresponding PEM
var kid = decodedJwt.header.kid;
var pem = jwkPem[kid];
if (!pem) {
    console.log("Invalid access token");
    return;
}

//Verify the signature of the JWT token to ensure it's really coming from your User Pool and that it has not expired
jwt.verify(jwtToken, pem, { issuer: iss, maxAge: 3600000}, function(err, payload) {
  if(err) {
    console.log(err);
  } else {
    console.log("Authorization successful");
  }
});

---

至于这个秘密，你指的是特定于应用程序客户端的吗？这是您在创建和安装应用程序客户端时得到的。转到AWS控制台和Cognito。选择适当的用户池，单击应用程序客户端。这是一个秘密，但你必须确保在创建应用程序客户端时选择创建它的选项（或者不使用）。否则，就做一个新的。

我只是挣扎着想和大家分享一下

如果使用maven，请将其添加到pom.xml中

<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>jwks-rsa</artifactId>
    <version>0.4.0</version>
</dependency>

创建一个实现RSAKeyProvider的类

import com.auth0.jwk.JwkException;
import com.auth0.jwk.JwkProvider;
import com.auth0.jwk.JwkProviderBuilder;
import com.auth0.jwt.interfaces.RSAKeyProvider;

import java.net.MalformedURLException;
import java.net.URL;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

public class AwsCognitoRSAKeyProvider implements RSAKeyProvider {

    private final URL aws_kid_store_url;
    private final JwkProvider provider;

    public AwsCognitoRSAKeyProvider(String aws_cognito_region, String aws_user_pools_id) {
        String url = String.format("https://cognito-idp.%s.amazonaws.com/%s/.well-known/jwks.json", aws_cognito_region, aws_user_pools_id);
        try {
            aws_kid_store_url = new URL(url);
        } catch (MalformedURLException e) {
            throw new RuntimeException(String.format("Invalid URL provided, URL=%s", url));
        }
        provider = new JwkProviderBuilder(aws_kid_store_url).build();
    }


    @Override
    public RSAPublicKey getPublicKeyById(String kid) {
        try {
            return (RSAPublicKey) provider.get(kid).getPublicKey();
        } catch (JwkException e) {
            throw new RuntimeException(String.format("Failed to get JWT kid=%s from aws_kid_store_url=%s", kid, aws_kid_store_url));
        }
    }

    @Override
    public RSAPrivateKey getPrivateKey() {
        return null;
    }

    @Override
    public String getPrivateKeyId() {
        return null;
    }
}

现在，您可以通过以下方式验证您的令牌

String aws_cognito_region = "us-east-1"; // Replace this with your aws cognito region
String aws_user_pools_id = "us-east-1_7DEw1nt5r"; // Replace this with your aws user pools id
RSAKeyProvider keyProvider = new AwsCognitoRSAKeyProvider(aws_cognito_region, aws_user_pools_id);
Algorithm algorithm = Algorithm.RSA256(keyProvider);
JWTVerifier jwtVerifier = JWT.require(algorithm)
    //.withAudience("2qm9sgg2kh21masuas88vjc9se") // Validate your apps audience if needed
    .build();

String token = "eyJraWQiOiJjdE.eyJzdWIiOiI5NTMxN2E.VX819z1A1rJij2"; // Replace this with your JWT token
jwtVerifier.verify(token);

请注意，JwkProviderBuilder将构建一个带有LRU缓存的JwkProvider，该缓存缓存从aws密钥存储库中检索到的密钥，非常整洁！可以使用生成器更改缓存规则

---

[UPDATE]将创建JwkProvider移动到构造函数，因此正如@danieln所评论的那样，缓存也得到了尊重，然而，它是旧的，有几个不推荐的项目，它会给你一个ideahttps://aws.amazon.com/blogs/developer/building-a-serverless-developer-authentication-api-in-java-using-aws-lambda-amazon-dynamodb-and-amazon-cognito-part-2/ 或者在这里看到这篇非常精彩的相关文章，我花了几个小时试图从不同的角度实现这一点。到目前为止，我发现没有一个解决方案像这一个那么简单直接。工作起来很有魅力！非常感谢，伙计。非常感谢，我终于成功了。我必须做的两件小事是获取jwt库的更新版本，并确保jwt令牌已被删除。@AndiDev回答得很好！您不应该初始化JwkProvider一次，然后在getPublicKeyById中返回它，而不是反复初始化它吗？@danieln说得不错。感觉应该在构造函数中创建JwkProvider提供程序。否则，我想缓存就不起作用了。不再使用此代码，因此我无法验证它。如果你能验证它是否按预期工作，我可以更改答案。我验证了它，它按预期工作。

import com.auth0.jwk.JwkException;
import com.auth0.jwk.JwkProvider;
import com.auth0.jwk.JwkProviderBuilder;
import com.auth0.jwt.interfaces.RSAKeyProvider;

import java.net.MalformedURLException;
import java.net.URL;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

public class AwsCognitoRSAKeyProvider implements RSAKeyProvider {

    private final URL aws_kid_store_url;
    private final JwkProvider provider;

    public AwsCognitoRSAKeyProvider(String aws_cognito_region, String aws_user_pools_id) {
        String url = String.format("https://cognito-idp.%s.amazonaws.com/%s/.well-known/jwks.json", aws_cognito_region, aws_user_pools_id);
        try {
            aws_kid_store_url = new URL(url);
        } catch (MalformedURLException e) {
            throw new RuntimeException(String.format("Invalid URL provided, URL=%s", url));
        }
        provider = new JwkProviderBuilder(aws_kid_store_url).build();
    }


    @Override
    public RSAPublicKey getPublicKeyById(String kid) {
        try {
            return (RSAPublicKey) provider.get(kid).getPublicKey();
        } catch (JwkException e) {
            throw new RuntimeException(String.format("Failed to get JWT kid=%s from aws_kid_store_url=%s", kid, aws_kid_store_url));
        }
    }

    @Override
    public RSAPrivateKey getPrivateKey() {
        return null;
    }

    @Override
    public String getPrivateKeyId() {
        return null;
    }
}

String aws_cognito_region = "us-east-1"; // Replace this with your aws cognito region
String aws_user_pools_id = "us-east-1_7DEw1nt5r"; // Replace this with your aws user pools id
RSAKeyProvider keyProvider = new AwsCognitoRSAKeyProvider(aws_cognito_region, aws_user_pools_id);
Algorithm algorithm = Algorithm.RSA256(keyProvider);
JWTVerifier jwtVerifier = JWT.require(algorithm)
    //.withAudience("2qm9sgg2kh21masuas88vjc9se") // Validate your apps audience if needed
    .build();

String token = "eyJraWQiOiJjdE.eyJzdWIiOiI5NTMxN2E.VX819z1A1rJij2"; // Replace this with your JWT token
jwtVerifier.verify(token);