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# frozen_string_literal: false
#
# httpresponse.rb -- HTTPResponse Class
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: httpresponse.rb,v 1.45 2003/07/11 11:02:25 gotoyuzo Exp $
require 'time'
require 'webrick/httpversion'
require 'webrick/htmlutils'
require 'webrick/httputils'
require 'webrick/httpstatus'
module WEBrick
##
# An HTTP response. This is filled in by the service or do_* methods of a
# WEBrick HTTP Servlet.
class HTTPResponse
class InvalidHeader < StandardError
end
##
# HTTP Response version
attr_reader :http_version
##
# Response status code (200)
attr_reader :status
##
# Response header
attr_reader :header
##
# Response cookies
attr_reader :cookies
##
# Response reason phrase ("OK")
attr_accessor :reason_phrase
##
# Body may be a String or IO-like object that responds to #read and
# #readpartial.
attr_accessor :body
##
# Request method for this response
attr_accessor :request_method
##
# Request URI for this response
attr_accessor :request_uri
##
# Request HTTP version for this response
attr_accessor :request_http_version
##
# Filename of the static file in this response. Only used by the
# FileHandler servlet.
attr_accessor :filename
##
# Is this a keep-alive response?
attr_accessor :keep_alive
##
# Configuration for this response
attr_reader :config
##
# Bytes sent in this response
attr_reader :sent_size
##
# Creates a new HTTP response object. WEBrick::Config::HTTP is the
# default configuration.
def initialize(config)
@config = config
@buffer_size = config[:OutputBufferSize]
@logger = config[:Logger]
@header = Hash.new
@status = HTTPStatus::RC_OK
@reason_phrase = nil
@http_version = HTTPVersion::convert(@config[:HTTPVersion])
@body = ''
@keep_alive = true
@cookies = []
@request_method = nil
@request_uri = nil
@request_http_version = @http_version # temporary
@chunked = false
@filename = nil
@sent_size = 0
end
##
# The response's HTTP status line
def status_line
"HTTP/#@http_version #@status #@reason_phrase #{CRLF}"
end
##
# Sets the response's status to the +status+ code
def status=(status)
@status = status
@reason_phrase = HTTPStatus::reason_phrase(status)
end
##
# Retrieves the response header +field+
def [](field)
@header[field.downcase]
end
##
# Sets the response header +field+ to +value+
def []=(field, value)
@header[field.downcase] = value.to_s
end
##
# The content-length header
def content_length
if len = self['content-length']
return Integer(len)
end
end
##
# Sets the content-length header to +len+
def content_length=(len)
self['content-length'] = len.to_s
end
##
# The content-type header
def content_type
self['content-type']
end
##
# Sets the content-type header to +type+
def content_type=(type)
self['content-type'] = type
end
##
# Iterates over each header in the response
def each
@header.each{|field, value| yield(field, value) }
end
##
# Will this response body be returned using chunked transfer-encoding?
def chunked?
@chunked
end
##
# Enables chunked transfer encoding.
def chunked=(val)
@chunked = val ? true : false
end
##
# Will this response's connection be kept alive?
def keep_alive?
@keep_alive
end
##
# Sends the response on +socket+
def send_response(socket) # :nodoc:
begin
setup_header()
send_header(socket)
send_body(socket)
rescue Errno::EPIPE, Errno::ECONNRESET, Errno::ENOTCONN => ex
@logger.debug(ex)
@keep_alive = false
rescue Exception => ex
@logger.error(ex)
@keep_alive = false
end
end
##
# Sets up the headers for sending
def setup_header() # :nodoc:
@reason_phrase ||= HTTPStatus::reason_phrase(@status)
@header['server'] ||= @config[:ServerSoftware]
@header['date'] ||= Time.now.httpdate
# HTTP/0.9 features
if @request_http_version < "1.0"
@http_version = HTTPVersion.new("0.9")
@keep_alive = false
end
# HTTP/1.0 features
if @request_http_version < "1.1"
if chunked?
@chunked = false
ver = @request_http_version.to_s
msg = "chunked is set for an HTTP/#{ver} request. (ignored)"
@logger.warn(msg)
end
end
# Determine the message length (RFC2616 -- 4.4 Message Length)
if @status == 304 || @status == 204 || HTTPStatus::info?(@status)
@header.delete('content-length')
@body = ""
elsif chunked?
@header["transfer-encoding"] = "chunked"
@header.delete('content-length')
elsif %r{^multipart/byteranges} =~ @header['content-type']
@header.delete('content-length')
elsif @header['content-length'].nil?
unless @body.is_a?(IO)
@header['content-length'] = @body ? @body.bytesize : 0
end
end
# Keep-Alive connection.
if @header['connection'] == "close"
@keep_alive = false
elsif keep_alive?
if chunked? || @header['content-length'] || @status == 304 || @status == 204 || HTTPStatus.info?(@status)
@header['connection'] = "Keep-Alive"
else
msg = "Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true"
@logger.warn(msg)
@header['connection'] = "close"
@keep_alive = false
end
else
@header['connection'] = "close"
end
# Location is a single absoluteURI.
if location = @header['location']
if @request_uri
@header['location'] = @request_uri.merge(location)
end
end
end
##
# Sends the headers on +socket+
def send_header(socket) # :nodoc:
if @http_version.major > 0
data = status_line()
@header.each{|key, value|
tmp = key.gsub(/\bwww|^te$|\b\w/){ $&.upcase }
data << "#{tmp}: #{check_header(value)}" << CRLF
}
@cookies.each{|cookie|
data << "Set-Cookie: " << check_header(cookie.to_s) << CRLF
}
data << CRLF
socket.write(data)
end
rescue InvalidHeader => e
@header.clear
@cookies.clear
set_error e
retry
end
##
# Sends the body on +socket+
def send_body(socket) # :nodoc:
if @body.respond_to? :readpartial then
send_body_io(socket)
elsif @body.respond_to?(:call) then
send_body_proc(socket)
else
send_body_string(socket)
end
end
def to_s # :nodoc:
ret = ""
send_response(ret)
ret
end
##
# Redirects to +url+ with a WEBrick::HTTPStatus::Redirect +status+.
#
# Example:
#
# res.set_redirect WEBrick::HTTPStatus::TemporaryRedirect
def set_redirect(status, url)
@body = "<HTML><A HREF=\"#{url}\">#{url}</A>.</HTML>\n"
@header['location'] = url.to_s
raise status
end
##
# Creates an error page for exception +ex+ with an optional +backtrace+
def set_error(ex, backtrace=false)
case ex
when HTTPStatus::Status
@keep_alive = false if HTTPStatus::error?(ex.code)
self.status = ex.code
else
@keep_alive = false
self.status = HTTPStatus::RC_INTERNAL_SERVER_ERROR
end
@header['content-type'] = "text/html; charset=ISO-8859-1"
if respond_to?(:create_error_page)
create_error_page()
return
end
if @request_uri
host, port = @request_uri.host, @request_uri.port
else
host, port = @config[:ServerName], @config[:Port]
end
error_body(backtrace, ex, host, port)
end
private
def check_header(header_value)
header_value = header_value.to_s
if /[\r\n]/ =~ header_value
raise InvalidHeader
else
header_value
end
end
# :stopdoc:
def error_body(backtrace, ex, host, port)
@body = ''
@body << <<-_end_of_html_
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
<HEAD><TITLE>#{HTMLUtils::escape(@reason_phrase)}</TITLE></HEAD>
<BODY>
<H1>#{HTMLUtils::escape(@reason_phrase)}</H1>
#{HTMLUtils::escape(ex.message)}
<HR>
_end_of_html_
if backtrace && $DEBUG
@body << "backtrace of `#{HTMLUtils::escape(ex.class.to_s)}' "
@body << "#{HTMLUtils::escape(ex.message)}"
@body << "<PRE>"
ex.backtrace.each{|line| @body << "\t#{line}\n"}
@body << "</PRE><HR>"
end
@body << <<-_end_of_html_
<ADDRESS>
#{HTMLUtils::escape(@config[:ServerSoftware])} at
#{host}:#{port}
</ADDRESS>
</BODY>
</HTML>
_end_of_html_
end
def send_body_io(socket)
begin
if @request_method == "HEAD"
# do nothing
elsif chunked?
begin
buf = ''
data = ''
while true
@body.readpartial( @buffer_size, buf ) # there is no need to clear buf?
data << format("%x", buf.bytesize) << CRLF
data << buf << CRLF
socket.write(data)
data.clear
@sent_size += buf.bytesize
end
rescue EOFError # do nothing
end
socket.write("0#{CRLF}#{CRLF}")
else
if %r{\Abytes (\d+)-(\d+)/\d+\z} =~ @header['content-range']
offset = $1.to_i
size = $2.to_i - offset + 1
else
offset = nil
size = @header['content-length']
size = size.to_i if size
end
begin
@sent_size = IO.copy_stream(@body, socket, size, offset)
rescue NotImplementedError
@body.seek(offset, IO::SEEK_SET)
@sent_size = IO.copy_stream(@body, socket, size)
end
end
ensure
@body.close
end
end
def send_body_string(socket)
if @request_method == "HEAD"
# do nothing
elsif chunked?
body ? @body.bytesize : 0
while buf = @body[@sent_size, @buffer_size]
break if buf.empty?
data = ""
data << format("%x", buf.bytesize) << CRLF
data << buf << CRLF
socket.write(data)
@sent_size += buf.bytesize
end
socket.write("0#{CRLF}#{CRLF}")
else
if @body && @body.bytesize > 0
socket.write(@body)
@sent_size = @body.bytesize
end
end
end
def send_body_proc(socket)
if @request_method == "HEAD"
# do nothing
elsif chunked?
@body.call(ChunkedWrapper.new(socket, self))
_write_data(socket, "0#{CRLF}#{CRLF}")
else
size = @header['content-length'].to_i
@body.call(socket)
@sent_size = size
end
end
class ChunkedWrapper
def initialize(socket, resp)
@socket = socket
@resp = resp
end
def write(buf)
return 0 if buf.empty?
socket = @socket
@resp.instance_eval {
size = buf.bytesize
data = "#{size.to_s(16)}#{CRLF}#{buf}#{CRLF}"
_write_data(socket, data)
data.clear
@sent_size += size
size
}
end
def <<(*buf)
write(buf)
self
end
end
# preserved for compatibility with some 3rd-party handlers
def _write_data(socket, data)
socket << data
end
# :startdoc:
end
end
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