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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 2011-2016 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;

import com.amazonaws.AmazonClientException;
import com.amazonaws.annotation.Immutable;
import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.internal.StaticCredentialsProvider;
import com.amazonaws.util.StringUtils;

/**
 * Serves credentials defined in a {@link BasicProfile}. Does validation that both access key and
 * secret key exists and are non empty.
 */
@SdkInternalApi
@Immutable
public class ProfileStaticCredentialsProvider implements AWSCredentialsProvider {

    private final BasicProfile profile;
    private final AWSCredentialsProvider credentialsProvider;

    public ProfileStaticCredentialsProvider(BasicProfile profile) {
        this.profile = profile;
        this.credentialsProvider = new StaticCredentialsProvider(fromStaticCredentials());
    }

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

    @Override
    public void refresh() {
        // No Op
    }

    private AWSCredentials fromStaticCredentials() {
        if (StringUtils.isNullOrEmpty(profile.getAwsAccessIdKey())) {
            throw new AmazonClientException(String.format(
                    "Unable to load credentials into profile [%s]: AWS Access Key ID is not specified.",
                    profile.getProfileName()));
        }
        if (StringUtils.isNullOrEmpty(profile.getAwsSecretAccessKey())) {
            throw new AmazonClientException(String.format(
                    "Unable to load credentials into profile [%s]: AWS Secret Access Key is not specified.",
                    profile.getAwsSecretAccessKey()));
        }

        if (profile.getAwsSessionToken() == null) {
            return new BasicAWSCredentials(profile.getAwsAccessIdKey(),
                                           profile.getAwsSecretAccessKey());
        } else {
            if (profile.getAwsSessionToken().isEmpty()) {
                throw new AmazonClientException(String.format(
                        "Unable to load credentials into profile [%s]: AWS Session Token is empty.",
                        profile.getProfileName()));
            }

            return new BasicSessionCredentials(profile.getAwsAccessIdKey(),
                                               profile.getAwsSecretAccessKey(),
                                               profile.getAwsSessionToken());
        }
    }

}