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require 'rack/body_proxy'

module Rack

  # Middleware tracks and cleans Tempfiles created throughout a request (i.e. Rack::Multipart)
  # Ideas/strategy based on posts by Eric Wong and Charles Oliver Nutter
  # https://groups.google.com/forum/#!searchin/rack-devel/temp/rack-devel/brK8eh-MByw/sw61oJJCGRMJ
  class TempfileReaper
    def initialize(app)
      @app = app
    end

    def call(env)
      env['rack.tempfiles'] ||= []
      status, headers, body = @app.call(env)
      body_proxy = BodyProxy.new(body) do
        env['rack.tempfiles'].each { |f| f.close! } unless env['rack.tempfiles'].nil?
      end
      [status, headers, body_proxy]
    end
  end
end