require 'active_support/core_ext/module/attribute_accessors' require 'action_dispatch/http/filter_redirect' require 'monitor' module ActionDispatch # :nodoc: # Represents an HTTP response generated by a controller action. Use it to # retrieve the current state of the response, or customize the response. It can # either represent a real HTTP response (i.e. one that is meant to be sent # back to the web browser) or a TestResponse (i.e. one that is generated # from integration tests). # # \Response is mostly a Ruby on \Rails framework implementation detail, and # should never be used directly in controllers. Controllers should use the # methods defined in ActionController::Base instead. For example, if you want # to set the HTTP response's content MIME type, then use # ActionControllerBase#headers instead of Response#headers. # # Nevertheless, integration tests may want to inspect controller responses in # more detail, and that's when \Response can be useful for application # developers. Integration test methods such as # ActionDispatch::Integration::Session#get and # ActionDispatch::Integration::Session#post return objects of type # TestResponse (which are of course also of type \Response). # # For example, the following demo integration test prints the body of the # controller response to the console: # # class DemoControllerTest < ActionDispatch::IntegrationTest # def test_print_root_path_to_console # get('/') # puts response.body # end # end class Response # The request that the response is responding to. attr_accessor :request # The HTTP status code. attr_reader :status attr_writer :sending_file # Get and set headers for this response. attr_accessor :header alias_method :headers=, :header= alias_method :headers, :header delegate :[], :[]=, :to => :@header delegate :each, :to => :@stream # Sets the HTTP response's content MIME type. For example, in the controller # you could write this: # # response.content_type = "text/plain" # # If a character set has been defined for this response (see charset=) then # the character set information will also be included in the content type # information. attr_reader :content_type # The charset of the response. HTML wants to know the encoding of the # content you're giving them, so we need to send that along. attr_accessor :charset CONTENT_TYPE = "Content-Type".freeze SET_COOKIE = "Set-Cookie".freeze LOCATION = "Location".freeze NO_CONTENT_CODES = [204, 304] cattr_accessor(:default_charset) { "utf-8" } cattr_accessor(:default_headers) include Rack::Response::Helpers include ActionDispatch::Http::FilterRedirect include ActionDispatch::Http::Cache::Response include MonitorMixin class Buffer # :nodoc: def initialize(response, buf) @response = response @buf = buf @closed = false end def write(string) raise IOError, "closed stream" if closed? @response.commit! @buf.push string end def each(&block) @response.sending! x = @buf.each(&block) @response.sent! x end def abort end def close @response.commit! @closed = true end def closed? @closed end end # The underlying body, as a streamable object. attr_reader :stream # Ruby 2.2 bug https://bugs.ruby-lang.org/issues/10685 prevents # default_headers from being a keyword argument. def initialize(status = 200, header = {}, body = [], default_headers = self.class.default_headers) super() header = merge_default_headers(header, default_headers) self.body, self.header, self.status = body, header, status @sending_file = false @blank = false @cv = new_cond @committed = false @sending = false @sent = false @content_type = nil @charset = nil if content_type = self[CONTENT_TYPE] type, charset = content_type.split(/;\s*charset=/) @content_type = Mime::Type.lookup(type) @charset = charset || self.class.default_charset end prepare_cache_control! yield self if block_given? end def await_commit synchronize do @cv.wait_until { @committed } end end def await_sent synchronize { @cv.wait_until { @sent } } end def commit! synchronize do before_committed @committed = true @cv.broadcast end end def sending! synchronize do before_sending @sending = true @cv.broadcast end end def sent! synchronize do @sent = true @cv.broadcast end end def sending?; synchronize { @sending }; end def committed?; synchronize { @committed }; end def sent?; synchronize { @sent }; end # Sets the HTTP status code. def status=(status) @status = Rack::Utils.status_code(status) end # Sets the HTTP content type. def content_type=(content_type) @content_type = content_type.to_s end # The response code of the request. def response_code @status end # Returns a string to ensure compatibility with Net::HTTPResponse. def code @status.to_s end # Returns the corresponding message for the current HTTP status code: # # response.status = 200 # response.message # => "OK" # # response.status = 404 # response.message # => "Not Found" # def message Rack::Utils::HTTP_STATUS_CODES[@status] end alias_method :status_message, :message # Returns the content of the response as a string. This contains the contents # of any calls to render. def body strings = [] each { |part| strings << part.to_s } strings.join end EMPTY = " " # Allows you to manually set or override the response body. def body=(body) @blank = true if body == EMPTY if body.respond_to?(:to_path) @stream = body else synchronize do @stream = build_buffer self, munge_body_object(body) end end end def body_parts parts = [] @stream.each { |x| parts << x } parts end def set_cookie(key, value) ::Rack::Utils.set_cookie_header!(header, key, value) end def delete_cookie(key, value={}) ::Rack::Utils.delete_cookie_header!(header, key, value) end # The location header we'll be responding with. def location headers[LOCATION] end alias_method :redirect_url, :location # Sets the location header we'll be responding with. def location=(url) headers[LOCATION] = url end def close stream.close if stream.respond_to?(:close) end def abort if stream.respond_to?(:abort) stream.abort elsif stream.respond_to?(:close) # `stream.close` should really be reserved for a close from the # other direction, but we must fall back to it for # compatibility. stream.close end end # Turns the Response into a Rack-compatible array of the status, headers, # and body. Allows explict splatting: # # status, headers, body = *response def to_a rack_response @status, @header.to_hash end alias prepare! to_a # Returns the response cookies, converted to a Hash of (name => value) pairs # # assert_equal 'AuthorOfNewPage', r.cookies['author'] def cookies cookies = {} if header = self[SET_COOKIE] header = header.split("\n") if header.respond_to?(:to_str) header.each do |cookie| if pair = cookie.split(';').first key, value = pair.split("=").map { |v| Rack::Utils.unescape(v) } cookies[key] = value end end end cookies end private def before_committed end def before_sending end def merge_default_headers(original, default) default.respond_to?(:merge) ? default.merge(original) : original end def build_buffer(response, body) Buffer.new response, body end def munge_body_object(body) body.respond_to?(:each) ? body : [body] end def assign_default_content_type_and_charset!(headers) return if headers[CONTENT_TYPE].present? @content_type ||= Mime::HTML @charset ||= self.class.default_charset unless @charset == false type = @content_type.to_s.dup type << "; charset=#{@charset}" if append_charset? headers[CONTENT_TYPE] = type end def append_charset? !@sending_file && @charset != false end class RackBody def initialize(response) @response = response end def each(*args, &block) @response.each(*args, &block) end def close # Rack "close" maps to Response#abort, and *not* Response#close # (which is used when the controller's finished writing) @response.abort end def body @response.body end def respond_to?(method, include_private = false) if method.to_s == 'to_path' @response.stream.respond_to?(method) else super end end def to_path @response.stream.to_path end def to_ary nil end end def rack_response(status, header) assign_default_content_type_and_charset!(header) handle_conditional_get! header[SET_COOKIE] = header[SET_COOKIE].join("\n") if header[SET_COOKIE].respond_to?(:join) if NO_CONTENT_CODES.include?(@status) header.delete CONTENT_TYPE [status, header, []] else [status, header, RackBody.new(self)] end end end end