zammad/lib/google_oauth2_database.rb

module OmniAuth
  module Strategies

    class GoogleOauth2Database < OmniAuth::Strategies::GoogleOauth2
      option :name, 'google_oauth2'

      def initialize(app, *args, &block)

        # database lookup
        puts 'GoogleOauth2Database -> initialize'
        config = Setting.get('auth_google_oauth2_credentials') || {}
        args[0] = config['client_id']
        args[1] = config['client_secret']
        super
      end

    end

  end
end