class WebSocket::Handshake::Handler::Client76

def challenge
  return @challenge if defined?(@challenge)
  key1 && key2
  sum = [@key1_number].pack('N*') +
        [@key2_number].pack('N*') +
        key3
  @challenge = Digest::MD5.digest(sum).strip
end

def finishing_line
  key3
end

def generate_key(key)
  spaces = rand(1..12)
  max = 0xffffffff / spaces
  number = rand(max + 1)
  instance_variable_set("@#{key}_number", number)
  key = (number * spaces).to_s
  rand(1..12).times do
    char = NOISE_CHARS[rand(NOISE_CHARS.size)]
    pos = rand(key.size + 1)
    key[pos...pos] = char
  end
  spaces.times do
    pos = 1 + rand(key.size - 1)
    key[pos...pos] = ' '
  end
  key
end

def generate_key3
  [rand(0x100000000)].pack('N') + [rand(0x100000000)].pack('N')
end

def handshake_keys
  keys = super
  keys << ['Sec-WebSocket-Key1', key1]
  keys << ['Sec-WebSocket-Key2', key2]
  keys
end

def key1
  @key1 ||= generate_key(:key1)
end

def key2
  @key2 ||= generate_key(:key2)
end

def key3
  @key3 ||= generate_key3
end

def provided_protocols
  Array(@handshake.headers['sec-websocket-protocol'].to_s.strip)
end

def reserved_leftover_lines
  1
end

def valid?
  super && verify_challenge && verify_protocol
end

def verify_challenge
  raise WebSocket::Error::Handshake::InvalidAuthentication unless @handshake.leftovers == challenge
  true
end