【Sinatra】ページ単位で Basic 認証を入れる

use Rack::Auth::Basic do |username, password|
  username == 'admin' && password == 'secret'
end

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'sinatra'
  gem 'puma'
end

helpers do
  def protected!
    return if authorized?

    halt(401, 'Unauthorized.')
  end

  def authorized?
    @auth ||= Rack::Auth::Basic::Request.new(request.env)

    return unless @auth.provided? && @auth.basic? && @auth.credentials

    @auth.credentials == ['takagi', 'thisispassword']
  end
end

get '/' do
  'Hello!'
end

get '/auth' do
  protected!

  'Authorized.'
end

Sinatra::Application.run!

$ curl localhost:4567
Hello!
$ curl localhost:4567/auth
Unauthorized.
$ curl --user takagi:thisispassword localhost:4567/auth
Authorized.