get signed url / lambda js

get-signed-url.js

'use strict'

const AWS = require('aws-sdk')
AWS.config.update({ region: process.env.AWS_REGION || 'us-east-1' })
const s3 = new AWS.S3()

// Main Lambda entry point
exports.handler = async (event) => {
  const result = await getUploadURL(event)
  return result
}

const getUploadURL = async function(event) {

  // this is probably where you want to auto generate some unique path
  const path = 'subdir/myfile.webm'
  const timestamp = Date.now()
  const type = event.queryStringParameters.type || 'webm'

  const s3Params = {
    Bucket: 'shoutouts-media',
    Key:  `submissions/${path}`,
    ContentType: `video/${type}`
    //ACL: 'public-read'      // Enable this setting to make the object publicly readable - only works if the bucket can support public objects
  }

  return new Promise((resolve, reject) => {
    // Get signed URL
    resolve({
      "statusCode": 200,
      "isBase64Encoded": false,
      "headers": {
        "Access-Control-Allow-Origin": "*"
      },
      "body": JSON.stringify({
          "uploadURL": s3.getSignedUrl('putObject', s3Params)
      })
    })
  })
}