Question

I have a rails app set up as an OAuth2 provider (using Doorkeeper). The app uses a different subdomain per user account (or an entirely different domain through a cname record)

i.e. 
user1.myrailsapp.com
user2.myrailsapp.com
www.mycustomdomain.com

On the provider side, everything is working as expected.

I also have a second app that is a client making use of the first app’s exposed API. I have a version of the client working but only with a hard coded site url in the OmniAuth strategy.

The question is, how can I dynamically set the strategy url on a per request basis.

Answer 1

For anyone interested, the solution is in the use of dynamic providers: https://github.com/intridea/omniauth/wiki/Dynamic-Providers

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :mystrategy, ENV["OAUTH_ID"], ENV["OAUTH_SECRET"],
    :setup => lambda{|env| 
      env['omniauth.strategy'].options[:client_options].site = env['rack.session']['oauth_site']
    }
end