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Library for Amazon AWS S3 (Simple Storage Service) integration.

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package com.crabshue.commons.aws.s3;

import org.apache.commons.lang3.StringUtils;

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.crabshue.commons.aws.AwsCredentials;
import com.crabshue.commons.aws.s3.domain.AwsS3Bucket;
import com.crabshue.commons.aws.s3.service.AwsS3Client;
import com.crabshue.commons.aws.s3.service.impl.AwsS3ClientImpl;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;

/**
 * {@link AwsS3Client} builder.
 */
@Slf4j
public class AwsS3ClientBuilder {

    private AwsS3Bucket awsS3Bucket;

    private AwsCredentials awsCredentials;

    /**
     * Prepare an {@link AwsS3Client} with a given {@link AwsS3Bucket}.
     *
     * @param awsS3Bucket the AWS S3 bucket
     * @return new instance.
     */
    public static AwsS3ClientBuilder of(@NonNull final AwsS3Bucket awsS3Bucket) {

        final AwsS3ClientBuilder ret = new AwsS3ClientBuilder();
        ret.awsS3Bucket = awsS3Bucket;
        return ret;
    }

    /**
     * Set credentials for {@link AwsS3Client};
     *
     * @param awsCredentials the credentials.
     * @return instance.
     */
    public AwsS3ClientBuilder withCredentials(@NonNull final AwsCredentials awsCredentials) {

        this.awsCredentials = awsCredentials;
        return this;
    }

    /**
     * Build the {@link AwsS3Client}.
     *
     * @return the client.
     */
    public AwsS3Client build() {

        final AmazonS3ClientBuilder amazonS3Builder = AmazonS3ClientBuilder.standard();

        if (this.awsCredentials != null && StringUtils.isNotBlank(awsCredentials.getAccessKeyId())
            && StringUtils.isNotBlank(awsCredentials.getSecretKeyId())) {

            final BasicAWSCredentials awsCreds = new BasicAWSCredentials(awsCredentials.getAccessKeyId(), awsCredentials.getSecretKeyId());

            amazonS3Builder.withCredentials(new AWSStaticCredentialsProvider(awsCreds));
        }

        amazonS3Builder.withRegion(awsS3Bucket.getRegion());

        final AmazonS3 amazonS3 = amazonS3Builder.build();

        logger.debug("Created AWS S3 client [{}]", amazonS3);

        return new AwsS3ClientImpl(amazonS3, this.awsS3Bucket);
    }
}