form.js

let s3 = require('./s3')

/**
 * render a direct to s3 file upload form
 *
 * @param {object} params
 * @param {string} params.redirect
 * @returns {DOMString}
 */
module.exports = function form ({ redirect }) {

  let bucket = process.env.S3_UPLOAD_BUCKET
  let nonce = Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 3)
  let name = `${Date.now()}-${nonce}`
  let key = `raw/${name}`
  let idx = process.env.S3_UPLOAD_KEY
  let secret = process.env.S3_UPLOAD_SECRET
  let region = process.env.AWS_REGION
  let type = 'image/'

  let config = {
    accessKey: idx,
    secretKey: secret,
    bucket,
    region
  }

  let doc = s3(config, { filename: key, contentType: type, redirect })
  let hidden = k => `<input type=hidden name=${k} value="${doc.params[k]}">`

  return `
  <form action=${doc.endpoint} method=post enctype=multipart/form-data>
    ${Object.keys(doc.params).map(hidden).join('')} 
    <!-- do the thing -->
    <input type=file name=file> 
    <input type=submit name=submit value=Upload>
  </form>`
}