Devise Firebase authentication

A strategy to use Google Firebase as the authentication service behind the already famous authentication solution: devise

Installation

Add this line to your application's Gemfile:

gem "devise-fireauth"

And then execute:

$ bundle install

Usage

Get your Firebse's Web API Key, then add a configuration section into the devise's initializer

# config/initializers/devise.rb
Devise.setup do |config|
  # Other configuration
  config.authentication_keys = [
    # Other keys, ex: email
    :id_token
  ]
  config.strip_whitespace_keys = [
    # Other keys, ex: email
    :id_token
  ]
  config.fireauth do |f|
    f.api_key = "YoUR-weB-aPi-KEy"
    f.project_id = "firebase-project-id"
    f.token_key = :id_token
  end
end

Modify your User model
- Use firebase_authenticatable strategy for devise
- Implement a class method User.from_firebase to find the corresponding user from your system. Example

# app/models/user.rb
class User < ApplicationRecord
  devise :firebase_authenticatable
  class << self
    def from_firebase(auth_hash)
      # Find or create new user with auth_hash["email"]
      # Update user name with auth_hash["displayName"]
      # Return a user to allow login, or nil to reject
    end
  end
end

Restart the server
From now on, you can authenticate with the API via firebase idToken by one of:
- Add params id_token to URL query
- Attach the header Authorization: Bearer #{id_token} to the request

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/yeuem1vannam/devise-fireauth. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the devise-fireauth project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.