com.amazonaws.auth.profile.internal.securitytoken.STSProfileCredentialsServiceProvider Maven / Gradle / Ivy

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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2014-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.auth.profile.internal.securitytoken;

import com.amazonaws.AmazonClientException;
import com.amazonaws.annotation.ThreadSafe;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;

@ThreadSafe
public class STSProfileCredentialsServiceProvider implements AWSCredentialsProvider {
    private static final String CLASS_NAME = "com.amazonaws.services.securitytoken.internal.STSProfileCredentialsService";
    private static volatile ProfileCredentialsService STS_CREDENTIALS_SERVICE;

    private final RoleInfo roleInfo;
    private volatile AWSCredentialsProvider profileCredentialsProvider;

    public STSProfileCredentialsServiceProvider(RoleInfo roleInfo) {
        this.roleInfo = roleInfo;
    }

    private AWSCredentialsProvider getProfileCredentialsProvider() {
        if (this.profileCredentialsProvider == null) {
            synchronized (STSProfileCredentialsServiceProvider.class) {
                if (this.profileCredentialsProvider == null) {
                    this.profileCredentialsProvider = getProfileCredentialService()
                            .getAssumeRoleCredentialsProvider(roleInfo);
                }
            }
        }
        return this.profileCredentialsProvider;
    }

    /**
     * Only called once per creation of each profile credential provider so we don't bother with any
     * double checked locking.
     */
    private static synchronized ProfileCredentialsService getProfileCredentialService() {
        if (STS_CREDENTIALS_SERVICE == null) {
            try {
                STS_CREDENTIALS_SERVICE = (ProfileCredentialsService) Class.forName(CLASS_NAME)
                        .newInstance();
            } catch (ClassNotFoundException ex) {
                throw new AmazonClientException(
                        "To use assume role profiles the aws-java-sdk-sts module must be on the class path.",
                        ex);
            } catch (InstantiationException ex) {
                throw new AmazonClientException("Failed to instantiate " + CLASS_NAME, ex);
            } catch (IllegalAccessException ex) {
                throw new AmazonClientException("Failed to instantiate " + CLASS_NAME, ex);
            }
        }
        return STS_CREDENTIALS_SERVICE;
    }


    @Override
    public AWSCredentials getCredentials() {
        return getProfileCredentialsProvider().getCredentials();
    }

    @Override
    public void refresh() {
        getProfileCredentialsProvider().refresh();
    }
}