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Editing: cascade.rb

# frozen_string_literal: true

require_relative 'constants'

module Rack
  # Rack::Cascade tries a request on several apps, and returns the
  # first response that is not 404 or 405 (or in a list of configured
  # status codes).  If all applications tried return one of the configured
  # status codes, return the last response.

class Cascade
    # deprecated, no longer used
    NotFound = [404, { CONTENT_TYPE => "text/plain" }, []]

# An array of applications to try in order.
    attr_reader :apps

# Set the apps to send requests to, and what statuses result in
    # cascading.  Arguments:
    #
    # apps: An enumerable of rack applications.
    # cascade_for: The statuses to use cascading for.  If a response is received
    #              from an app, the next app is tried.
    def initialize(apps, cascade_for = [404, 405])
      @apps = []
      apps.each { |app| add app }

@cascade_for = {}
      [*cascade_for].each { |status| @cascade_for[status] = true }
    end

# Call each app in order.  If the responses uses a status that requires
    # cascading, try the next app.  If all responses require cascading,
    # return the response from the last app.
    def call(env)
      return [404, { CONTENT_TYPE => "text/plain" }, []] if @apps.empty?
      result = nil
      last_body = nil

@apps.each do |app|
        # The SPEC says that the body must be closed after it has been iterated
        # by the server, or if it is replaced by a middleware action. Cascade
        # replaces the body each time a cascade happens. It is assumed that nil
        # does not respond to close, otherwise the previous application body
        # will be closed. The final application body will not be closed, as it
        # will be passed to the server as a result.
        last_body.close if last_body.respond_to? :close

result = app.call(env)
        return result unless @cascade_for.include?(result[0].to_i)
        last_body = result[2]
      end

result
    end

# Append an app to the list of apps to cascade.  This app will
    # be tried last.
    def add(app)
      @apps << app
    end

# Whether the given app is one of the apps to cascade to.
    def include?(app)
      @apps.include?(app)
    end

alias_method :<<, :add
  end
end

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