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# frozen_string_literal: true
require 'time'
module Rack
# Rack::Response provides a convenient interface to create a Rack
# response.
#
# It allows setting of headers and cookies, and provides useful
# defaults (an OK response with empty headers and body).
#
# You can use Response#write to iteratively generate your response,
# but note that this is buffered by Rack::Response until you call
# +finish+. +finish+ however can take a block inside which calls to
# +write+ are synchronous with the Rack response.
#
# Your application's +call+ should end returning Response#finish.
class Response
def self.[](status, headers, body)
self.new(body, status, headers)
end
CHUNKED = 'chunked'
STATUS_WITH_NO_ENTITY_BODY = Utils::STATUS_WITH_NO_ENTITY_BODY
attr_accessor :length, :status, :body
attr_reader :headers
# @deprecated Use {#headers} instead.
alias header headers
# Initialize the response object with the specified body, status
# and headers.
#
# @param body [nil, #each, #to_str] the response body.
# @param status [Integer] the integer status as defined by the
# HTTP protocol RFCs.
# @param headers [#each] a list of key-value header pairs which
# conform to the HTTP protocol RFCs.
#
# Providing a body which responds to #to_str is legacy behaviour.
def initialize(body = nil, status = 200, headers = {})
@status = status.to_i
@headers = Utils::HeaderHash[headers]
@writer = self.method(:append)
@block = nil
# Keep track of whether we have expanded the user supplied body.
if body.nil?
@body = []
@buffered = true
@length = 0
elsif body.respond_to?(:to_str)
@body = [body]
@buffered = true
@length = body.to_str.bytesize
else
@body = body
@buffered = false
@length = 0
end
yield self if block_given?
end
def redirect(target, status = 302)
self.status = status
self.location = target
end
def chunked?
CHUNKED == get_header(TRANSFER_ENCODING)
end
# Generate a response array consistent with the requirements of the SPEC.
# @return [Array] a 3-tuple suitable of `[status, headers, body]`
# which is suitable to be returned from the middleware `#call(env)` method.
def finish(&block)
if STATUS_WITH_NO_ENTITY_BODY[status.to_i]
delete_header CONTENT_TYPE
delete_header CONTENT_LENGTH
close
return [@status, @headers, []]
else
if block_given?
@block = block
return [@status, @headers, self]
else
return [@status, @headers, @body]
end
end
end
alias to_a finish # For *response
def each(&callback)
@body.each(&callback)
@buffered = true
if @block
@writer = callback
@block.call(self)
end
end
# Append to body and update Content-Length.
#
# NOTE: Do not mix #write and direct #body access!
#
def write(chunk)
buffered_body!
@writer.call(chunk.to_s)
end
def close
@body.close if @body.respond_to?(:close)
end
def empty?
@block == nil && @body.empty?
end
def has_header?(key); headers.key? key; end
def get_header(key); headers[key]; end
def set_header(key, v); headers[key] = v; end
def delete_header(key); headers.delete key; end
alias :[] :get_header
alias :[]= :set_header
module Helpers
def invalid?; status < 100 || status >= 600; end
def informational?; status >= 100 && status < 200; end
def successful?; status >= 200 && status < 300; end
def redirection?; status >= 300 && status < 400; end
def client_error?; status >= 400 && status < 500; end
def server_error?; status >= 500 && status < 600; end
def ok?; status == 200; end
def created?; status == 201; end
def accepted?; status == 202; end
def no_content?; status == 204; end
def moved_permanently?; status == 301; end
def bad_request?; status == 400; end
def unauthorized?; status == 401; end
def forbidden?; status == 403; end
def not_found?; status == 404; end
def method_not_allowed?; status == 405; end
def precondition_failed?; status == 412; end
def unprocessable?; status == 422; end
def redirect?; [301, 302, 303, 307, 308].include? status; end
def include?(header)
has_header? header
end
# Add a header that may have multiple values.
#
# Example:
# response.add_header 'Vary', 'Accept-Encoding'
# response.add_header 'Vary', 'Cookie'
#
# assert_equal 'Accept-Encoding,Cookie', response.get_header('Vary')
#
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
def add_header(key, v)
if v.nil?
get_header key
elsif has_header? key
set_header key, "#{get_header key},#{v}"
else
set_header key, v
end
end
# Get the content type of the response.
def content_type
get_header CONTENT_TYPE
end
# Set the content type of the response.
def content_type=(content_type)
set_header CONTENT_TYPE, content_type
end
def media_type
MediaType.type(content_type)
end
def media_type_params
MediaType.params(content_type)
end
def content_length
cl = get_header CONTENT_LENGTH
cl ? cl.to_i : cl
end
def location
get_header "Location"
end
def location=(location)
set_header "Location", location
end
def set_cookie(key, value)
cookie_header = get_header SET_COOKIE
set_header SET_COOKIE, ::Rack::Utils.add_cookie_to_header(cookie_header, key, value)
end
def delete_cookie(key, value = {})
set_header SET_COOKIE, ::Rack::Utils.add_remove_cookie_to_header(get_header(SET_COOKIE), key, value)
end
def set_cookie_header
get_header SET_COOKIE
end
def set_cookie_header=(v)
set_header SET_COOKIE, v
end
def cache_control
get_header CACHE_CONTROL
end
def cache_control=(v)
set_header CACHE_CONTROL, v
end
# Specifies that the content shouldn't be cached. Overrides `cache!` if already called.
def do_not_cache!
set_header CACHE_CONTROL, "no-cache, must-revalidate"
set_header EXPIRES, Time.now.httpdate
end
# Specify that the content should be cached.
# @param duration [Integer] The number of seconds until the cache expires.
# @option directive [String] The cache control directive, one of "public", "private", "no-cache" or "no-store".
def cache!(duration = 3600, directive: "public")
unless headers[CACHE_CONTROL] =~ /no-cache/
set_header CACHE_CONTROL, "#{directive}, max-age=#{duration}"
set_header EXPIRES, (Time.now + duration).httpdate
end
end
def etag
get_header ETAG
end
def etag=(v)
set_header ETAG, v
end
protected
def buffered_body!
return if @buffered
if @body.is_a?(Array)
# The user supplied body was an array:
@body = @body.compact
@body.each do |part|
@length += part.to_s.bytesize
end
else
# Turn the user supplied body into a buffered array:
body = @body
@body = Array.new
body.each do |part|
@writer.call(part.to_s)
end
body.close if body.respond_to?(:close)
end
@buffered = true
end
def append(chunk)
@body << chunk
unless chunked?
@length += chunk.bytesize
set_header(CONTENT_LENGTH, @length.to_s)
end
return chunk
end
end
include Helpers
class Raw
include Helpers
attr_reader :headers
attr_accessor :status
def initialize(status, headers)
@status = status
@headers = headers
end
def has_header?(key); headers.key? key; end
def get_header(key); headers[key]; end
def set_header(key, v); headers[key] = v; end
def delete_header(key); headers.delete key; end
end
end
end