Ruby Firebase Auth

I have a Rails App where I need to authenticate firebase users on the server-side, not just in JavaScript.

I found these instructions from google: https://firebase.google.com/docs/auth/admin/verify-id-tokens

Unfortunately, it appears Google does not have support for Ruby. So, I made my own auth file!

Installation:

Using Rubygems:

gem install firebase-token-verify

Using Bundler

Add gem 'firebase-token-verify' to your Gemfile and run bundle install

Example use-case scenario:

1. Lookup your firebase id and add it to your Ruby code, for example: PROJECT_ID = <your_firebase_project_id>
2. Obtain a user token. You will need to be connected with JavaScript, or a mobile app, to obtain the user token. I usually obtain a user token using a JavaScript method similar to the one below:

user.getIdToken(true).then(token => {
  // Send this token to your Ruby application
})

3. Setup some Ruby code to process the token

require 'firebase_ruby_auth'

PROJECT_ID = ENV['<your_firebase_project_id>']

FirebaseRubyAuth.new(PROJECT_ID).decode_token(token)