amazoncognito：如何验证访问令牌的签名？

Question

文件上说https://docs.aws.amazon.com/cognito/latest/developerguide/amazon-cognito-user-pools-using-tokens-with-identity-providers.html

必须验证访问令牌。如何验证令牌？

Answer 1

如果您使用的是Java，那么您就很幸运了。我编程的方式是，

    // Parse the Cognito Keys and get the key by kid
    // Key is just a class that is used for parsing JSON to POJO
    Key key = this.keyService.getKeyByKeyId(JWT.decode(token).getKeyId());

    // Use Key's N and E
    BigInteger modulus = new BigInteger(1, Base64.decodeBase64(key.getN()));
    BigInteger exponent = new BigInteger(1, Base64.decodeBase64(key.getE()));

    // Create a publick key
    PublicKey publicKey = null;
    try {
        publicKey = KeyFactory.getInstance("RSA").generatePublic(new RSAPublicKeySpec(modulus, exponent));
    } catch (InvalidKeySpecException e) {
        // Throw error
    } catch (NoSuchAlgorithmException e) {
        // Throw error
    }

    // get an algorithm instance
    Algorithm algorithm = Algorithm.RSA256((RSAPublicKey) publicKey, null);

    // I verify ISS field of the token to make sure it's from the Cognito source
    String iss = String.format("https://cognito-idp.%s.amazonaws.com/%s", REGION, POOL_ID);

    JWTVerifier verifier = JWT.require(algorithm)
            .withIssuer(iss)
            .withClaim("token_use", "id") // make sure you're verifying id token
            .build();

    // Verify the token
    DecodedJWT jwt = verifier.verify(token);

    // Parse various fields
    String username = jwt.getClaim("sub").asString();
    String email = jwt.getClaim("email").asString();
    String phone = jwt.getClaim("phone_number").asString();
    String[] groups = jwt.getClaim("cognito:groups").asArray(String.class);

我正在使用这个repo来验证和解析令牌，

    <dependency>
        <groupId>com.auth0</groupId>
        <artifactId>java-jwt</artifactId>
        <version>3.4.1</version>
    </dependency>

请确保您正在导入以下内容，

    import com.auth0.jwt.JWT;
    import com.auth0.jwt.JWTVerifier;
    import com.auth0.jwt.algorithms.Algorithm;
    import com.auth0.jwt.exceptions.JWTDecodeException;
    import com.auth0.jwt.interfaces.DecodedJWT;

    import java.math.BigInteger;
    import java.security.KeyFactory;
    import java.security.NoSuchAlgorithmException;
    import java.security.PublicKey;
    import java.security.interfaces.RSAPublicKey;
    import java.security.spec.InvalidKeySpecException;
    import java.security.spec.RSAPublicKeySpec;
    import org.apache.commons.codec.binary.Base64;