rails4 Devise omniauth How to modify dynamically one of the strategy options? - ruby-on-rails-4

Question

I am using Devise+Omniauth , and I defined my own doorkeeper strategy to add a language option
In config/initializers/devise.rb , I set up :
require 'omniauth/strategies/doorkeeper'
config.omniauth :doorkeeper, Rails.application.secrets.doorkeeper_app_id, Rails.application.secrets.doorkeeper_app_secret,
:client_options => {
:site => Rails.application.secrets.doorkeeper_url
},
:authorize_params =>{:lang => I18n.locale}
which initially set lang to :en ( default locale )
this works fine and send the lang options to the remote server for Doorkeeperprocessing
now, how can I change this parameter in my client calling controller ?
I tried to use :
def index
I18n.locale = :fr
Rails.application.config.middleware.use OmniAuth::Builder do
provider :doorkeeper, :setup => lambda{|env| env['omniauth.strategy'].options[:authorize_params][:lang] = env['rack.session'][I18n.locale] }
end
but I got an error :
RuntimeError (can't modify frozen Array):
app/controllers/home_controller.rb:7:in `index'
Is there any better way to do it ? thanks for help

Answer 1

I modified the config/initializers/devise.rb, adding :setup => true
require 'omniauth/strategies/doorkeeper'
config.omniauth :doorkeeper, Rails.application.secrets.doorkeeper_app_id, Rails.application.secrets.doorkeeper_app_secret,
:client_options => {
:site => Rails.application.secrets.doorkeeper_url
},
:authorize_params =>{:lang => I18n.locale},
:setup => true
and I modified my doorkeeper strategy, to include the setup_phase, in which I set the lang option to the current locale.
def setup_phase
request.env['omniauth.strategy'].options[:authorize_params][:lang] = request.params["locale"]
end