Sample Code for S3 Presigned URLs in AWS SDK v3

I was stuck for a while because I encountered a NET::ERR_CERT_COMMON_NAME_INVALID error. This happened because when I provided an endpoint to the S3Client, the returned presignedUrl had a duplicated bucket name, such as hoge-bucket.hoge-bucket.s3-ap-northeast-1.amazonaws.com/hoge. It seems you should not specify the endpoint in a production environment.

import { PutObjectCommand, S3Client } from '@aws-sdk/client-s3';
import { getSignedUrl } from '@aws-sdk/s3-request-presigner';

const fileName = 'hoge';
const fileType = 'jpg';

const client = new S3Client({
	region: process.env.S3_REGION,
	endpoint: process.env.S3_ENDPOINT, // Specify the LocalStack URL only during development. This should be undefined in production.
	forcePathStyle: process.env.S3_FORCE_PATH_STYLE, // Set this to true only during development because LocalStack only supports path style.
});

const key = '${fileName}-${Date.now()}`; // Append a hash at the end to avoid duplicate filenames.

const params = {
	Bucket: process.env.S3_BUCKET_NAME,
	Key: key,
	ContentType: fileType,
};

const command = new PutObjectCommand(params);

const url = await getSignedUrl(client, command, { expiresIn: 3600 });

console.log(url);