deploys3.js

const AWS = require('aws-sdk');
const fs = require('fs');
const mime = require('mime-types')
const path = require("path");

// Base AWS config.
// AWS Reference: Make sure the profile exists in ~/.aws/credentials
// See managing access keys:
// https://docs.aws.amazon.com/general/latest/gr/managing-aws-access-keys.html
// https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html#id_users_create_console


const config = {
    s3_bucket_name: 'whatever-bucket-name',
    build_path: './build', // local build path
    aws_profile: 'your-aws-profile',
    target_path:"subfolder-in-bucket" //this will put files in a subfolder
};


//Load profile ID and key secret
const credentials = new AWS.SharedIniFileCredentials({
    profile: config.aws_profile
});

//Update AWS config
AWS.config.credentials = credentials;

//Create a new S3 object
const s3 = new AWS.S3();

const build_folder_path = path.join(__dirname, config.build_path.replace(/^\/+/g, ''));

// removes the root path: ie /user/dave/projects/project/build from /user/dave/projects/project/build/index.html
// so you get /index.html - then it removes the leading slash to give you index.html
// then it adds the target_path ie: folder/index.html
// it uses this as the file key name for the AWS s3
const normalize_base_path = (file_path) =>{
    return path.join(config.target_path,file_path.replace(build_folder_path,"").replace(/^\/+/g, ''))
}

const upload_file = (file_path) => {
    fs.readFile(file_path, (error, file_buffer) => {
        // if unable to read file contents, throw exception
        if (error) {
            throw error;
        }
        //we only want the path from the build folder
        const rel_path = normalize_base_path(file_path)

        //get the mime type of the file for the AWS Content Type
        const mimetype = mime.lookup(file_path)
        if(!mimetype){
            console.log(`'${file_path}:'Mime type not found. Skipping file!`)
            return;
        }
        //upload file to S3
        s3.putObject({
            Bucket: config.s3_bucket_name,
            Key: rel_path,
            ContentType:mimetype,
            Body: file_buffer
        }, (res) => {
            console.log(`Wrote: '${rel_path}'`);
        });
    });
}


const upload_folder = (folder_path) => {
    console.log(folder_path)
    fs.readdir(folder_path, (err, files) => {
        if (!files || files.length === 0) {
            console.log(`provided folder '${build_folder_path}' is empty or does not exist.`);
            console.log('Make sure your project was compiled!');
            return;
        }
        for (const f_name of files) {
            // get the full path of the file
            const f_path = path.join(folder_path, f_name);

            //hit a directory, do recursion
            if (fs.lstatSync(f_path).isDirectory()) {
                upload_folder(f_path)
            }else {
                //otherwise upload file
                upload_file(f_path)
            }
        }

    })
}


upload_folder(build_folder_path)