How can I password-protect my /sidekiq route (i.e. require authentication for the Sidekiq::Web tool)?

I am using sidekiq in my rails application. By Default, Sidekiq can be accessed by anybody by appending "/sidekiq" after the url. I want to password protect / authenticate only the sidekiq part. How can i do that?

Put the following into your sidekiq initializer

require 'sidekiq'
require 'sidekiq/web'

Sidekiq::Web.use(Rack::Auth::Basic) do |user, password|
  # Protect against timing attacks:
  # - See https://codahale.com/a-lesson-in-timing-attacks/
  # - See https://thisdata.com/blog/timing-attacks-against-string-comparison/
  # - Use & (do not use &&) so that it doesn't short circuit.
  # - Use digests to stop length information leaking
  Rack::Utils.secure_compare(::Digest::SHA256.hexdigest(user), ::Digest::SHA256.hexdigest(ENV["SIDEKIQ_USER"])) &
  Rack::Utils.secure_compare(::Digest::SHA256.hexdigest(password), ::Digest::SHA256.hexdigest(ENV["SIDEKIQ_PASSWORD"]))
end

And in the routes file:

mount Sidekiq::Web => '/sidekiq'

Sorry to late to the party, but Sidekiq's wiki recommends the following for Devise:

To allow any authenticated User:

# config/routes.rb
authenticate :user do
  mount Sidekiq::Web => '/sidekiq'
end

To restrict access to User.admin?

# config/routes.rb
authenticate :user, lambda { |u| u.admin? } do
  mount Sidekiq::Web => '/sidekiq'
end

This wiki post also has many other security schemes.

This was tested using Rails 5.1.3, Devise 4.3 and Sidekiq 5.0