AWS SDK を使用して、オブジェクトを取得するための Amazon S3 ディレクトリバケットの署名付き URL を作成する

S3 ディレクトリバケット内のオブジェクトにアクセスするための署名付き GET URL を生成します。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.S3Exception;
import software.amazon.awssdk.services.s3.presigner.S3Presigner;
import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
import software.amazon.awssdk.services.s3.presigner.model.PresignedGetObjectRequest;

import java.nio.file.Path;
import java.time.Duration;

import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Presigner;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteAllObjectsInDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.getFilePath;
import static com.example.s3.util.S3DirectoryBucketUtils.putDirectoryBucketObject;


    /**
     * Generates a presigned URL for accessing an object in the specified S3
     * directory bucket.
     *
     * @param s3Presigner The S3 presigner client used to generate the presigned URL
     * @param bucketName  The name of the directory bucket
     * @param objectKey   The key (name) of the object to access
     * @return A presigned URL for accessing the specified object
     */
    public static String generatePresignedGetURLForDirectoryBucket(S3Presigner s3Presigner, String bucketName,
            String objectKey) {
        logger.info("Generating presigned URL for object: {} in bucket: {}", objectKey, bucketName);

        try {
            // Create a GetObjectRequest
            GetObjectRequest getObjectRequest = GetObjectRequest.builder()
                    .bucket(bucketName)
                    .key(objectKey)
                    .build();

            // Create a GetObjectPresignRequest
            GetObjectPresignRequest getObjectPresignRequest = GetObjectPresignRequest.builder()
                    .signatureDuration(Duration.ofMinutes(10)) // Presigned URL valid for 10 minutes
                    .getObjectRequest(getObjectRequest)
                    .build();

            // Generate the presigned URL
            PresignedGetObjectRequest presignedGetObjectRequest = s3Presigner.presignGetObject(getObjectPresignRequest);

            // Get the presigned URL
            String presignedURL = presignedGetObjectRequest.url().toString();
            logger.info("Presigned URL: {}", presignedURL);
            return presignedURL;

        } catch (S3Exception e) {
            logger.error("Failed to generate presigned URL: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            throw e;
        }
    }