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module WebSocket
class Driver
class Draft76 < Draft75
BODY_SIZE = 8
def initialize(socket, options = {})
super
input = @socket.env['rack.input']
@stage = -1
@body = Driver.encode(input ? input.read : '', :binary)
@headers.clear
@headers['Upgrade'] = 'WebSocket'
@headers['Connection'] = 'Upgrade'
@headers['Sec-WebSocket-Origin'] = @socket.env['HTTP_ORIGIN']
@headers['Sec-WebSocket-Location'] = @socket.url
end
def version
'hixie-76'
end
def start
return false unless super
send_handshake_body
true
end
def close(reason = nil, code = nil)
return false if @ready_state == 3
@socket.write([0xFF, 0x00].pack('C*'))
@ready_state = 3
emit(:close, CloseEvent.new(nil, nil))
true
end
private
def handshake_response
env = @socket.env
key1 = env['HTTP_SEC_WEBSOCKET_KEY1']
number1 = number_from_key(key1)
spaces1 = spaces_in_key(key1)
key2 = env['HTTP_SEC_WEBSOCKET_KEY2']
number2 = number_from_key(key2)
spaces2 = spaces_in_key(key2)
if number1 % spaces1 != 0 or number2 % spaces2 != 0
emit(:error, ProtocolError.new('Client sent invalid Sec-WebSocket-Key headers'))
close
return nil
end
@key_values = [number1 / spaces1, number2 / spaces2]
start = 'HTTP/1.1 101 WebSocket Protocol Handshake'
headers = [start, @headers.to_s, '']
headers.join("\r\n")
end
def handshake_signature
return nil unless @body.bytesize >= BODY_SIZE
head = @body[0...BODY_SIZE]
Digest::MD5.digest((@key_values + [head]).pack('N2A*'))
end
def send_handshake_body
return unless signature = handshake_signature
@socket.write(Driver.encode(signature, :binary))
@stage = 0
open
parse(@body[BODY_SIZE..-1]) if @body.bytesize > BODY_SIZE
end
def parse_leading_byte(octet)
return super unless octet == 0xFF
@closing = true
@length = 0
@stage = 1
end
def number_from_key(key)
key.scan(/[0-9]/).join('').to_i(10)
end
def spaces_in_key(key)
key.scan(/ /).size
end
end
end
end
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