vendor/rails/railties/lib/rails/rack/static.rb

   1 module Rails
   2   module Rack
   3     class Static
   4       FILE_METHODS = %w(GET HEAD).freeze
   5
   6       def initialize(app)
   7         @app = app
   8         @file_server = ::Rack::File.new(File.join(RAILS_ROOT, "public"))
   9       end
  10
  11       def call(env)
  12         path        = env['PATH_INFO'].chomp('/')
  13         method      = env['REQUEST_METHOD']
  14         cached_path = (path.empty? ? 'index' : path) + ::ActionController::Base.page_cache_extension
  15
  16         if FILE_METHODS.include?(method)
  17           if file_exist?(path)
  18             return @file_server.call(env)
  19           elsif file_exist?(cached_path)
  20             env['PATH_INFO'] = cached_path
  21             return @file_server.call(env)
  22           end
  23         end
  24
  25         @app.call(env)
  26       end
  27
  28       private
  29         def file_exist?(path)
  30           full_path = File.join(@file_server.root, ::Rack::Utils.unescape(path))
  31           File.file?(full_path) && File.readable?(full_path)
  32         end
  33     end
  34   end
  35 end