When getImageSource is not available

1. Check if converted images is in local storge (or cache). Use it if exists
2. If not - just get it and save it for current and future launches

• First endpoint is a Firebase Cloud Functions https://us-central1-getimagesource.cloudfunctions.net/converter/
• Second endpoint is a Heroku app on Free account (can sleep) https://getimagesource.herokuapp.com/

You can deploy this repo onto your server with your endpoint. Don't forget to set root url (without trailing slash) in root index.js:

require('./functions/app')('/your/endpoint/uri').listen(process.env.PORT || 3000);

or leave it as is if base url will be /.

Now you can start to convert. For more details see endpoint main page.