/
rack.rb
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/
rack.rb
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require 'securerandom'
require 'lotus/action/request'
module Lotus
module Action
# Rack integration API
#
# @since 0.1.0
module Rack
# The default HTTP response code
#
# @since 0.1.0
# @api private
DEFAULT_RESPONSE_CODE = 200
# The default Rack response body
#
# @since 0.1.0
# @api private
DEFAULT_RESPONSE_BODY = []
# The default HTTP Request ID length
#
# @since 0.3.0
# @api private
#
# @see Lotus::Action::Rack#request_id
DEFAULT_REQUEST_ID_LENGTH = 16
# Override Ruby's hook for modules.
# It includes basic Lotus::Action modules to the given class.
#
# @param base [Class] the target action
#
# @since 0.1.0
# @api private
#
# @see http://www.ruby-doc.org/core-2.1.2/Module.html#method-i-included
def self.included(base)
base.extend ClassMethods
end
module ClassMethods
# Use a Rack middleware as a before callback.
#
# The middleware will be used as it is, no matter if it's a class or an
# instance. If it needs to be initialized, please do it before to pass
# it as the argument of this method.
#
# At the runtime, the middleware be invoked with the raw Rack env.
#
# Multiple middlewares can be employed, just by using multiple times
# this method.
#
# @param middleware [#call] A Rack middleware
#
# @since 0.2.0
#
# @see Lotus::Action::Callbacks::ClassMethods#before
#
# @example Class Middleware
# require 'lotus/controller'
#
# module Sessions
# class Create
# include Lotus::Action
# use OmniAuth
#
# def call(params)
# # ...
# end
# end
# end
#
# @example Instance Middleware
# require 'lotus/controller'
#
# module Sessions
# class Create
# include Lotus::Controller
# use XMiddleware.new('x', 123)
#
# def call(params)
# # ...
# end
# end
# end
def use(middleware)
before do |params|
middleware.call(params.env)
end
end
end
protected
# Gets the headers from the response
#
# @return [Hash] the HTTP headers from the response
#
# @since 0.1.0
#
# @example
# require 'lotus/controller'
#
# class Show
# include Lotus::Action
#
# def call(params)
# # ...
# self.headers # => { ... }
# self.headers.merge!({'X-Custom' => 'OK'})
# end
# end
def headers
@headers
end
# Returns a serialized Rack response (Array), according to the current
# status code, headers, and body.
#
# @return [Array] the serialized response
#
# @since 0.1.0
# @api private
#
# @see Lotus::Action::Rack::DEFAULT_RESPONSE_CODE
# @see Lotus::Action::Rack::DEFAULT_RESPONSE_BODY
# @see Lotus::Action::Rack#status=
# @see Lotus::Action::Rack#headers
# @see Lotus::Action::Rack#body=
def response
[ @_status || DEFAULT_RESPONSE_CODE, headers, @_body || DEFAULT_RESPONSE_BODY.dup ]
end
# Calculates an unique ID for the current request
#
# @return [String] The unique ID
#
# @since 0.3.0
def request_id
# FIXME make this number configurable and document the probabilities of clashes
@request_id ||= SecureRandom.hex(DEFAULT_REQUEST_ID_LENGTH)
end
# Returns a Lotus specialized rack request
#
# @return [Lotus::Action::Request] The request
#
# @since 0.3.1
#
# @example
# require 'lotus/controller'
#
# class Create
# include Lotus::Action
#
# def call(params)
# ip = request.ip
# secure = request.ssl?
# end
# end
def request
@request ||= ::Lotus::Action::Request.new(@_env)
end
private
# Sets the HTTP status code for the response
#
# @param status [Fixnum] an HTTP status code
# @return [void]
#
# @since 0.1.0
#
# @example
# require 'lotus/controller'
#
# class Create
# include Lotus::Action
#
# def call(params)
# # ...
# self.status = 201
# end
# end
def status=(status)
@_status = status
end
# Sets the body of the response
#
# @param body [String] the body of the response
# @return [void]
#
# @since 0.1.0
#
# @example
# require 'lotus/controller'
#
# class Show
# include Lotus::Action
#
# def call(params)
# # ...
# self.body = 'Hi!'
# end
# end
def body=(body)
body = Array(body) unless body.respond_to?(:each)
@_body = body
end
end
end
end