# -*- encoding: binary -*-
# Writes a Rack response to your client using the HTTP/1.1 specification.
# You use it by simply doing:
#
#   status, headers, body = rack_app.call(env)
#   http_response_write(socket, status, headers, body)
#
# Most header correctness (including Content-Length and Content-Type)
# is the job of Rack, with the exception of the "Date" and "Status" header.
module Unicorn::HttpResponse

  # Every standard HTTP code mapped to the appropriate message.
  CODES = Rack::Utils::HTTP_STATUS_CODES.inject({}) { |hash,(code,msg)|
    hash[code] = "#{code} #{msg}"
    hash
  }
  CRLF = "\r\n"

  # writes the rack_response to socket as an HTTP response
  def http_response_write(socket, status, headers, body)
    status = CODES[status.to_i] || status

    if headers
      buf = "HTTP/1.1 #{status}\r\n" \
            "Date: #{httpdate}\r\n" \
            "Status: #{status}\r\n" \
            "Connection: close\r\n"
      headers.each do |key, value|
        next if %r{\A(?:Date\z|Connection\z)}i =~ key
        if value =~ /\n/
          # avoiding blank, key-only cookies with /\n+/
          buf << value.split(/\n+/).map! { |v| "#{key}: #{v}\r\n" }.join
        else
          buf << "#{key}: #{value}\r\n"
        end
      end
      socket.write(buf << CRLF)
    end

    body.each { |chunk| socket.write(chunk) }
    ensure
      body.respond_to?(:close) and body.close
  end
end