aws sdk承担角色未生效

Question

ive使下面的代码段运行。我对aws的调用工作正常，但是现在，我仍然不得不将角色切换成问题，使它生效，因为它似乎仍然停留在原始角色中。

    public void awsAssumeRoleUsingEnvironmentVariable(Regions region, String roleARN, String roleSessionName) throws Exception {
        AWSSecurityTokenService stsClient = AWSSecurityTokenServiceClientBuilder.standard()
                .withCredentials(new EnvironmentVariableCredentialsProvider())
                .withRegion(region)
                .build();

        GetCallerIdentityRequest request = new GetCallerIdentityRequest();
        GetCallerIdentityResult response = stsClient.getCallerIdentity(request);

        System.out.println("CURRENT ROLE ASSUMED IS: " + response.toString());

        request = new GetCallerIdentityRequest();

        System.out.println("EXECUTING ASSUME ROLE");
        AssumeRoleRequest roleRequest = new AssumeRoleRequest()
                .withRoleArn(roleARN)
                .withRoleSessionName(roleSessionName);

        AssumeRoleResult roleResponse = stsClient.assumeRole(roleRequest);

        Credentials sessionCredentials = roleResponse.getCredentials();

        response = stsClient.getCallerIdentity(request);

        System.out.println("CURRENT ROLE ASSUMED IS: " + response.toString());
    }

[getCallerIdentity每次都返回相同的角色

编辑：仅仅尝试解决它，这绝对是我尝试使用通过AWSCLI返回的凭证进行编码的方式的问题。当我对运行我的应用程序时产生的System.out.println()变量执行sessionCredentials并使用以下命令手动导出返回的键时...

export AWS_ACCESS_KEY_ID=RoleAccessKeyID
export AWS_SECRET_ACCESS_KEY=RoleSecretKey
export AWS_SESSION_TOKEN=RoleSessionToken

后跟..

aws sts get-caller-identity

返回了正确的角色，所以我的Java代码acceptRole似乎正在工作并且正在获取凭据，但是就像Im不能正确设置客户端，所以它没有使用刚假设的角色。

非常感谢

Answer 1

如注释中所述，使用sessionCredentials创建一个可以传递给任何资源客户端的新BasicSessionCredentials。

此处为示例代码https://docs.aws.amazon.com/AmazonS3/latest/dev/AuthUsingTempSessionTokenJava.html

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder;
import com.amazonaws.services.securitytoken.model.AssumeRoleRequest;
import com.amazonaws.services.securitytoken.model.AssumeRoleResult;
import com.amazonaws.services.securitytoken.model.Credentials;

public class MakingRequestsWithIAMTempCredentials {
    public static void main(String[] args) {
        String clientRegion = "*** Client region ***";
        String roleARN = "*** ARN for role to be assumed ***";
        String roleSessionName = "*** Role session name ***";
        String bucketName = "*** Bucket name ***";

        try {
            // Creating the STS client is part of your trusted code. It has
            // the security credentials you use to obtain temporary security credentials.
            AWSSecurityTokenService stsClient = AWSSecurityTokenServiceClientBuilder.standard()
                                                    .withCredentials(new ProfileCredentialsProvider())
                                                    .withRegion(clientRegion)
                                                    .build();

            // Obtain credentials for the IAM role. Note that you cannot assume the role of an AWS root account;
            // Amazon S3 will deny access. You must use credentials for an IAM user or an IAM role.
            AssumeRoleRequest roleRequest = new AssumeRoleRequest()
                                                    .withRoleArn(roleARN)
                                                    .withRoleSessionName(roleSessionName);
            AssumeRoleResult roleResponse = stsClient.assumeRole(roleRequest);
            Credentials sessionCredentials = roleResponse.getCredentials();

            // Create a BasicSessionCredentials object that contains the credentials you just retrieved.
            BasicSessionCredentials awsCredentials = new BasicSessionCredentials(
                    sessionCredentials.getAccessKeyId(),
                    sessionCredentials.getSecretAccessKey(),
                    sessionCredentials.getSessionToken());

            // Provide temporary security credentials so that the Amazon S3 client 
        // can send authenticated requests to Amazon S3. You create the client 
        // using the sessionCredentials object.
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                                    .withCredentials(new AWSStaticCredentialsProvider(awsCredentials))
                                    .withRegion(clientRegion)
                                    .build();

            // Verify that assuming the role worked and the permissions are set correctly
            // by getting a set of object keys from the bucket.
            ObjectListing objects = s3Client.listObjects(bucketName);
            System.out.println("No. of Objects: " + objects.getObjectSummaries().size());
        }
        catch(AmazonServiceException e) {
            // The call was transmitted successfully, but Amazon S3 couldn't process 
            // it, so it returned an error response.
            e.printStackTrace();
        }
        catch(SdkClientException e) {
            // Amazon S3 couldn't be contacted for a response, or the client
            // couldn't parse the response from Amazon S3.
            e.printStackTrace();
        }
    }
}