OAuth Signup Handler sketch for affinity.works

oauth_signup_handlers.rb

module OAuthSignupHandlers
  extend ActiveSupport::Concern

  def classify_person
    if @person = Person.find_by_email(@auth.info.email)
      classify_existing_person
    elsif @person = Person.build_from_oauth_signup(@auth)
      NewMember
    else
      Invalid
    end
  end

  def classify_existing_person
    return AlreadyMember if @person.is_member_of? current_group
    return InfoNeeded if @person.missing_contact_info?
    return NoInfoNeeded if @person.missing_contact_info?
  end

  module NewMember
    def self.handle
      # handle new member
    end
  end

  module AlreadyMember
    def self.handle
      # handle already member
    end
  end

  module InfoNeeded
    def self.handle
      # handle info neeeded
    end
  end

  module NoInfoNeeded
    def self.handle
      # handle no info neeeded
    end
  end

  module Invalid
    def self.handle
      # handle invalid
    end
  end
end

### USAGE:
# omniauth_callbacks_controller.rb

class People::OmniauthCallbacksController < Devise::OmniauthCallbacksController
  include OAuthSingupHandlers

  # lots of stuff omitted

  def signup
    classify_person.handle
  end
end