AWSS3Service.js

const AWS = require('aws-sdk');

class AWSS3Service {

	/**
	 * Get new S3 Instance
	 */
	getS3Instance() {
		return new AWS.S3({
			accessKeyId: "YOUR_AWS_ACCESS_KEY",
			secretAccessKey: "YOUR_AWS_SECRET_ACCESS_KEY"
		});
	}

	/**
	 * Upload new file
	 * @param {*} bucketName 
	 * @param {*} access 
	 * @param {*} file 
	 * @param {*} fileName 
	 */
	async uploadFile(bucketName, access = 'private', file, fileName) {
		const s3 = this.getS3Instance();
		const params = {
			Bucket: bucketName,
			ACL: access,
			Key: fileName,
			Body: file
		};
		return await s3.upload(params).promise();
	}

	/**
	 * Get file
	 * @param {*} bucket 
	 * @param {*} fileName 
	 */
	async getFile(bucket, fileName) {
		const s3 = this.getS3Instance();
		const params = { Bucket: bucket, Key: fileName };
		return await s3.getObject(params).promise();
	}
}