external_identity
external_identity validates incoming authentication tokens (for example jwt) from external identity management services like Auth0 and Firebase. It runs as a Rack middleware which means that it works seamlessly with Rails, Grape, Sinatra and other Rack based applications.
Installation
Add the following line to Gemfile:
gem "external_identity", github: "kiqr/external_identity" # Use development branch until first release.
and run bundle install from your terminal to install it.