150 lines
3.6 KiB
Ruby
150 lines
3.6 KiB
Ruby
require 'rack/request'
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require 'rack/utils'
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module Rack
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# Rack::Response provides a convenient interface to create a Rack
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# response.
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#
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# It allows setting of headers and cookies, and provides useful
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# defaults (a OK response containing HTML).
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#
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# You can use Response#write to iteratively generate your response,
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# but note that this is buffered by Rack::Response until you call
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# +finish+. +finish+ however can take a block inside which calls to
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# +write+ are syncronous with the Rack response.
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#
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# Your application's +call+ should end returning Response#finish.
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class Response
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attr_accessor :length
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def initialize(body=[], status=200, header={}, &block)
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@status = status.to_i
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@header = Utils::HeaderHash.new({"Content-Type" => "text/html"}.
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merge(header))
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@writer = lambda { |x| @body << x }
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@block = nil
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@length = 0
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@body = []
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if body.respond_to? :to_str
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write body.to_str
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elsif body.respond_to?(:each)
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body.each { |part|
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write part.to_s
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}
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else
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raise TypeError, "stringable or iterable required"
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end
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yield self if block_given?
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end
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attr_reader :header
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attr_accessor :status, :body
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def [](key)
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header[key]
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end
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def []=(key, value)
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header[key] = value
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end
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def set_cookie(key, value)
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Utils.set_cookie_header!(header, key, value)
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end
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def delete_cookie(key, value={})
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Utils.delete_cookie_header!(header, key, value)
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end
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def redirect(target, status=302)
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self.status = status
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self["Location"] = target
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end
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def finish(&block)
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@block = block
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if [204, 304].include?(status.to_i)
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header.delete "Content-Type"
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[status.to_i, header, []]
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else
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[status.to_i, header, self]
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end
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end
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alias to_a finish # For *response
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def each(&callback)
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@body.each(&callback)
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@writer = callback
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@block.call(self) if @block
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end
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# Append to body and update Content-Length.
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#
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# NOTE: Do not mix #write and direct #body access!
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#
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def write(str)
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s = str.to_s
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@length += Rack::Utils.bytesize(s)
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@writer.call s
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header["Content-Length"] = @length.to_s
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str
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end
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def close
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body.close if body.respond_to?(:close)
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end
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def empty?
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@block == nil && @body.empty?
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end
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alias headers header
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module Helpers
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def invalid?; @status < 100 || @status >= 600; end
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def informational?; @status >= 100 && @status < 200; end
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def successful?; @status >= 200 && @status < 300; end
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def redirection?; @status >= 300 && @status < 400; end
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def client_error?; @status >= 400 && @status < 500; end
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def server_error?; @status >= 500 && @status < 600; end
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def ok?; @status == 200; end
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def forbidden?; @status == 403; end
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def not_found?; @status == 404; end
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def redirect?; [301, 302, 303, 307].include? @status; end
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def empty?; [201, 204, 304].include? @status; end
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# Headers
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attr_reader :headers, :original_headers
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def include?(header)
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!!headers[header]
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end
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def content_type
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headers["Content-Type"]
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end
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def content_length
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cl = headers["Content-Length"]
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cl ? cl.to_i : cl
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end
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def location
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headers["Location"]
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end
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end
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include Helpers
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end
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end
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