Class: Faye::WebSocket::HybiParser

Inherits:
Object
  • Object
show all
Defined in:
lib/faye/websocket/hybi_parser.rb,
lib/faye/websocket/hybi_parser/handshake.rb,
lib/faye/websocket/hybi_parser/stream_reader.rb

Defined Under Namespace

Classes: Handshake, StreamReader

Constant Summary collapse

BYTE = 
0b11111111
FIN = 
MASK = 0b10000000
RSV1 = 
0b01000000
RSV2 = 
0b00100000
RSV3 = 
0b00010000
OPCODE = 
0b00001111
LENGTH = 
0b01111111
OPCODES = 
{
  :continuation => 0,
  :text         => 1,
  :binary       => 2,
  :close        => 8,
  :ping         => 9,
  :pong         => 10
}
FRAGMENTED_OPCODES = 
OPCODES.values_at(:continuation, :text, :binary)
OPENING_OPCODES = 
OPCODES.values_at(:text, :binary)
ERRORS = 
{
  :normal_closure   => 1000,
  :going_away       => 1001,
  :protocol_error   => 1002,
  :unacceptable     => 1003,
  :encoding_error   => 1007,
  :policy_violation => 1008,
  :too_large        => 1009,
  :extension_error  => 1010
}
ERROR_CODES = 
ERRORS.values

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(web_socket, options = {}) ⇒ HybiParser

Returns a new instance of HybiParser.



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# File 'lib/faye/websocket/hybi_parser.rb', line 44

def initialize(web_socket, options = {})
  reset
  @socket    = web_socket
  @reader    = StreamReader.new
  @stage     = 0
  @masking   = options[:masking]
  @protocols = options[:protocols]

  @protocols = @protocols.split(/\s*,\s*/) if String === @protocols
end

Instance Attribute Details

#protocol ⇒ Object (readonly)

Returns the value of attribute protocol.



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# File 'lib/faye/websocket/hybi_parser.rb', line 42

def protocol
  @protocol
end

Instance Method Details

#close(code = nil, reason = nil, &callback) ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 176

def close(code = nil, reason = nil, &callback)
  return if @closed
  @closing_callback ||= callback
  @socket.send(reason || '', :close, code || ERRORS[:normal_closure])
  @closed = true
end

#create_handshake ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 87

def create_handshake
  Handshake.new(@socket.uri, @protocols)
end

#frame(data, type = nil, code = nil) ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 128

def frame(data, type = nil, code = nil)
  return nil if @closed

  is_text = (String === data)
  opcode  = OPCODES[type || (is_text ? :text : :binary)]
  buffer  = data.respond_to?(:bytes) ? data.bytes.to_a : data
  insert  = code ? 2 : 0
  length  = buffer.size + insert
  header  = (length <= 125) ? 2 : (length <= 65535 ? 4 : 10)
  offset  = header + (@masking ? 4 : 0)
  masked  = @masking ? MASK : 0
  frame   = Array.new(offset)

  frame[0] = FIN | opcode

  if length <= 125
    frame[1] = masked | length
  elsif length <= 65535
    frame[1] = masked | 126
    frame[2] = (length >> 8) & BYTE
    frame[3] = length & BYTE
  else
    frame[1] = masked | 127
    frame[2] = (length >> 56) & BYTE
    frame[3] = (length >> 48) & BYTE
    frame[4] = (length >> 40) & BYTE
    frame[5] = (length >> 32) & BYTE
    frame[6] = (length >> 24) & BYTE
    frame[7] = (length >> 16) & BYTE
    frame[8] = (length >> 8)  & BYTE
    frame[9] = length & BYTE
  end

  if code
    buffer = [(code >> 8) & BYTE, code & BYTE] + buffer
  end

  if @masking
    mask = [rand(256), rand(256), rand(256), rand(256)]
    frame[header...offset] = mask
    buffer = Mask.mask(buffer, mask)
  end

  frame.concat(buffer)

  WebSocket.encode(frame)
end

#handshake_response ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 59

def handshake_response
  sec_key = @socket.env['HTTP_SEC_WEBSOCKET_KEY']
  return '' unless String === sec_key

  accept    = Base64.encode64(Digest::SHA1.digest(sec_key + Handshake::GUID)).strip
  protos    = @socket.env['HTTP_SEC_WEBSOCKET_PROTOCOL']
  supported = @protocols
  proto     = nil

  headers = [
    "HTTP/1.1 101 Switching Protocols",
    "Upgrade: websocket",
    "Connection: Upgrade",
    "Sec-WebSocket-Accept: #{accept}"
  ]

  if protos and supported
    protos = protos.split(/\s*,\s*/) if String === protos
    proto = protos.find { |p| supported.include?(p) }
    if proto
      @protocol = proto
      headers << "Sec-WebSocket-Protocol: #{proto}"
    end
  end

  (headers + ['','']).join("\r\n")
end

#parse(data) ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 91

def parse(data)
  @reader.put(data.bytes.to_a)
  buffer = true
  while buffer
    case @stage
      when 0 then
        buffer = @reader.read(1)
        parse_opcode(buffer[0]) if buffer

      when 1 then
        buffer = @reader.read(1)
        parse_length(buffer[0]) if buffer

      when 2 then
        buffer = @reader.read(@length_size)
        parse_extended_length(buffer) if buffer

      when 3 then
        buffer = @reader.read(4)
        if buffer
          @mask  = buffer
          @stage = 4
        end

      when 4 then
        buffer = @reader.read(@length)
        if buffer
          @payload = buffer
          emit_frame
          @stage = 0
        end
    end
  end

  nil
end

#version ⇒ Object 



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# File 'lib/faye/websocket/hybi_parser.rb', line 55

def version
  "hybi-#{@socket.env['HTTP_SEC_WEBSOCKET_VERSION']}"
end