AWS S3 multiple file uploader

S3FileUploaderService.java

package com.clozenough.service;

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.CannedAccessControlList;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.clozenough.config.AwsConfig;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.util.ArrayList;
import java.util.List;

@Service
@RequiredArgsConstructor
public class S3FileUploaderService {

    public static final String FILE_PATH_IN_S3 = "%s/%s/%s/%s";

    private final AmazonS3 s3client;
    private final AwsConfig awsConfig;


    public List<String> upload(List<MultipartFile> multipartFiles, Long hostId) {
        List<String> uploadedFileUrls = new ArrayList<>();
        AwsConfig.S3Config s3 = awsConfig.getS3();
        for (MultipartFile multipartFile : multipartFiles) {
            String fileName = multipartFile.getOriginalFilename();
            uploadFileTos3bucket(fileName, multipartFile, hostId);
            uploadedFileUrls.add(String.format(FILE_PATH_IN_S3,
                                               s3.getUrl(),
                                               s3.getBucketName(),
                                               hostId,
                                               fileName));
        }

        return uploadedFileUrls;
    }

    @SneakyThrows
    private void uploadFileTos3bucket(String fileName, MultipartFile multipartFile, Long hostId) {
        AwsConfig.S3Config s3 = awsConfig.getS3();
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setHeader("hostId", hostId);
        s3client.putObject(new PutObjectRequest(s3.getBucketName(),
                                                hostId + "/" + fileName,
                                                multipartFile.getInputStream(),
                                                objectMetadata)
                                   .withCannedAcl(CannedAccessControlList.PublicRead));
    }
}