| Current File : //opt/alt/ruby27/share/gems/gems/rack-3.0.8/lib/rack/response.rb |
# frozen_string_literal: true
require 'time'
require_relative 'constants'
require_relative 'utils'
require_relative 'media_type'
require_relative 'headers'
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.
def header
warn 'Rack::Response#header is deprecated and will be removed in Rack 3.1', uplevel: 1
headers
end
# Initialize the response object with the specified +body+, +status+
# and +headers+.
#
# If the +body+ is +nil+, construct an empty response object with internal
# buffering.
#
# If the +body+ responds to +to_str+, assume it's a string-like object and
# construct a buffered response object containing using that string as the
# initial contents of the buffer.
#
# Otherwise it is expected +body+ conforms to the normal requirements of a
# Rack response body, typically implementing one of +each+ (enumerable
# body) or +call+ (streaming body).
#
# The +status+ defaults to +200+ which is the "OK" HTTP status code. You
# can provide any other valid status code.
#
# The +headers+ must be a +Hash+ of key-value header pairs which conform to
# the Rack specification for response headers. The key must be a +String+
# instance and the value can be either a +String+ or +Array+ instance.
def initialize(body = nil, status = 200, headers = {})
@status = status.to_i
unless headers.is_a?(Hash)
warn "Providing non-hash headers to Rack::Response is deprecated and will be removed in Rack 3.1", uplevel: 1
end
@headers = Headers.new
# Convert headers input to a plain hash with lowercase keys.
headers.each do |k, v|
@headers[k] = v
end
@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 = nil # undetermined as of yet.
@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
def no_entity_body?
# The response body is an enumerable body and it is not allowed to have an entity body.
@body.respond_to?(:each) && STATUS_WITH_NO_ENTITY_BODY[@status]
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 no_entity_body?
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)
raise ArgumentError unless key.is_a?(String)
@headers.key?(key)
end
def get_header(key)
raise ArgumentError unless key.is_a?(String)
@headers[key]
end
def set_header(key, value)
raise ArgumentError unless key.is_a?(String)
@headers[key] = value
end
def delete_header(key)
raise ArgumentError unless key.is_a?(String)
@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 not_acceptable?; status == 406; end
def request_timeout?; status == 408; 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, value)
raise ArgumentError unless key.is_a?(String)
if value.nil?
return get_header(key)
end
value = value.to_s
if header = get_header(key)
if header.is_a?(Array)
header << value
else
set_header(key, [header, value])
end
else
set_header(key, value)
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)
add_header SET_COOKIE, Utils.set_cookie_header(key, value)
end
def delete_cookie(key, value = {})
set_header(SET_COOKIE,
Utils.delete_set_cookie_header!(
get_header(SET_COOKIE), key, value
)
)
end
def set_cookie_header
get_header SET_COOKIE
end
def set_cookie_header=(value)
set_header SET_COOKIE, value
end
def cache_control
get_header CACHE_CONTROL
end
def cache_control=(value)
set_header CACHE_CONTROL, value
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=(value)
set_header ETAG, value
end
protected
def buffered_body!
if @buffered.nil?
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
elsif @body.respond_to?(:each)
# 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)
@buffered = true
else
@buffered = false
end
end
return @buffered
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, value)
headers[key] = value
end
def delete_header(key)
headers.delete(key)
end
end
end
end