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| | require 'rack/request'
require 'rack/utils'
module Rack
# Rack::Response provides a convenient interface to create a Rack
# response.
#
# It allows setting of headers and cookies, and provides useful
# defaults (a OK response containing HTML).
#
# 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 syncronous with the Rack response.
#
# Your application's +call+ should end returning Response#finish.
class Response
attr_accessor :length
def initialize(body=[], status=200, header={}, &block)
@status = status.to_i
@header = Utils::HeaderHash.new({"Content-Type" => "text/html"}.
merge(header))
@writer = lambda { |x| @body << x }
@block = nil
@length = 0
@body = []
if body.respond_to? :to_str
write body.to_str
elsif body.respond_to?(:each)
body.each { |part|
write part.to_s
}
else
raise TypeError, "stringable or iterable required"
end
yield self if block_given?
end
attr_reader :header
attr_accessor :status, :body
def [](key)
header[key]
end
def []=(key, value)
header[key] = value
end
def set_cookie(key, value)
Utils.set_cookie_header!(header, key, value)
end
def delete_cookie(key, value={})
Utils.delete_cookie_header!(header, key, value)
end
def redirect(target, status=302)
self.status = status
self["Location"] = target
end
def finish(&block)
@block = block
if [204, 304].include?(status.to_i)
header.delete "Content-Type"
[status.to_i, header, []]
else
[status.to_i, header, self]
end
end
alias to_a finish # For *response
def each(&callback)
@body.each(&callback)
@writer = callback
@block.call(self) if @block
end
# Append to body and update Content-Length.
#
# NOTE: Do not mix #write and direct #body access!
#
def write(str)
s = str.to_s
@length += Rack::Utils.bytesize(s)
@writer.call s
header["Content-Length"] = @length.to_s
str
end
def close
body.close if body.respond_to?(:close)
end
def empty?
@block == nil && @body.empty?
end
alias headers 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 forbidden?; @status == 403; end
def not_found?; @status == 404; end
def redirect?; [301, 302, 303, 307].include? @status; end
def empty?; [201, 204, 304].include? @status; end
# Headers
attr_reader :headers, :original_headers
def include?(header)
!!headers[header]
end
def content_type
headers["Content-Type"]
end
def content_length
cl = headers["Content-Length"]
cl ? cl.to_i : cl
end
def location
headers["Location"]
end
end
include Helpers
end
end
|