Class: WebSocket

Inherits:
Object
  • Object
show all
Defined in:
lib/web/web-socket-ruby/lib/web_socket.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

WEB_SOCKET_GUID =
"258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
OPCODE_CONTINUATION =
0x00
OPCODE_TEXT =
0x01
OPCODE_BINARY =
0x02
OPCODE_CLOSE =
0x08
OPCODE_PING =
0x09
OPCODE_PONG =
0x0a

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arg, params = {}) ⇒ WebSocket

Returns a new instance of WebSocket.



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 37

def initialize(arg, params = {})
  if params[:server] # server

    @server = params[:server]
    @socket = arg
    line = gets()
    if !line
      raise(WebSocket::Error, "Client disconnected without sending anything.")
    end
    line = line.chomp()
    if !(line =~ /\AGET (\S+) HTTP\/1.1\z/n)
      raise(WebSocket::Error, "Invalid request: #{line}")
    end
    @path = $1
    read_header()
    if @header["sec-websocket-version"]
      @web_socket_version = @header["sec-websocket-version"]
      @key3 = nil
    elsif @header["sec-websocket-key1"] && @header["sec-websocket-key2"]
      @web_socket_version = "hixie-76"
      @key3 = read(8)
    else
      @web_socket_version = "hixie-75"
      @key3 = nil
    end
    if !@server.accepted_origin?(self.origin)
      raise(WebSocket::Error,
        ("Unaccepted origin: %s (server.accepted_domains = %p)\n\n" +
          "To accept this origin, write e.g. \n" +
          "  WebSocketServer.new(..., :accepted_domains => [%p]), or\n" +
          "  WebSocketServer.new(..., :accepted_domains => [\"*\"])\n") %
        [self.origin, @server.accepted_domains, @server.origin_to_domain(self.origin)])
    end
    @handshaked = false

  else # client
    
    @web_socket_version = "hixie-76"
    uri = arg.is_a?(String) ? URI.parse(arg) : arg

    if uri.scheme == "ws"
      default_port = 80
    elsif uri.scheme = "wss"
      default_port = 443
    else
      raise(WebSocket::Error, "unsupported scheme: #{uri.scheme}")
    end

    @path = (uri.path.empty? ? "/" : uri.path) + (uri.query ? "?" + uri.query : "")
    host = uri.host + ((!uri.port || uri.port == default_port) ? "" : ":#{uri.port}")
    origin = params[:origin] || "http://#{uri.host}"
    key1 = generate_key()
    key2 = generate_key()
    key3 = generate_key3()

    socket = TCPSocket.new(uri.host, uri.port || default_port)

    if uri.scheme == "ws"
      @socket = socket
    else
      @socket = ssl_handshake(socket)
    end

    write(
      "GET #{@path} HTTP/1.1\r\n" +
      "Upgrade: WebSocket\r\n" +
      "Connection: Upgrade\r\n" +
      "Host: #{host}\r\n" +
      "Origin: #{origin}\r\n" +
      "Sec-WebSocket-Key1: #{key1}\r\n" +
      "Sec-WebSocket-Key2: #{key2}\r\n" +
      "\r\n" +
      "#{key3}")
    flush()

    line = gets().chomp()
    raise(WebSocket::Error, "bad response: #{line}") if !(line =~ /\AHTTP\/1.1 101 /n)
    read_header()
    if (@header["sec-websocket-origin"] || "").downcase() != origin.downcase()
      raise(WebSocket::Error,
        "origin doesn't match: '#{@header["sec-websocket-origin"]}' != '#{origin}'")
    end
    reply_digest = read(16)
    expected_digest = hixie_76_security_digest(key1, key2, key3)
    if reply_digest != expected_digest
      raise(WebSocket::Error,
        "security digest doesn't match: %p != %p" % [reply_digest, expected_digest])
    end
    @handshaked = true

  end
  @received = []
  @buffer = ""
  @closing_started = false
end

Class Attribute Details

.debugObject

Returns the value of attribute debug.



21
22
23
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 21

def debug
  @debug
end

Instance Attribute Details

#headerObject (readonly)

Returns the value of attribute header.



133
134
135
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 133

def header
  @header
end

#pathObject (readonly)

Returns the value of attribute path.



133
134
135
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 133

def path
  @path
end

#serverObject (readonly)

Returns the value of attribute server.



133
134
135
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 133

def server
  @server
end

Instance Method Details

#close(code = 1005, reason = "", origin = :self) ⇒ Object

Does closing handshake.



275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 275

def close(code = 1005, reason = "", origin = :self)
  if !@closing_started
    case @web_socket_version
      when "hixie-75", "hixie-76"
        write("\xff\x00")
      else
        if code == 1005
          payload = ""
        else
          payload = [code].pack("n") + force_encoding(reason.dup(), "ASCII-8BIT")
        end
        send_frame(OPCODE_CLOSE, payload, false)
    end
  end
  @socket.close() if origin == :peer
  @closing_started = true
end

#close_socketObject



293
294
295
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 293

def close_socket()
  @socket.close()
end

#handshake(status = nil, header = {}) ⇒ Object



135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 135

def handshake(status = nil, header = {})
  if @handshaked
    raise(WebSocket::Error, "handshake has already been done")
  end
  status ||= "101 Switching Protocols"
  def_header = {}
  case @web_socket_version
    when "hixie-75"
      def_header["WebSocket-Origin"] = self.origin
      def_header["WebSocket-Location"] = self.location
      extra_bytes = ""
    when "hixie-76"
      def_header["Sec-WebSocket-Origin"] = self.origin
      def_header["Sec-WebSocket-Location"] = self.location
      extra_bytes = hixie_76_security_digest(
        @header["Sec-WebSocket-Key1"], @header["Sec-WebSocket-Key2"], @key3)
    else
      def_header["Sec-WebSocket-Accept"] = security_digest(@header["sec-websocket-key"])
      extra_bytes = ""
  end
  header = def_header.merge(header)
  header_str = header.map(){ |k, v| "#{k}: #{v}\r\n" }.join("")
  # Note that Upgrade and Connection must appear in this order.
  write(
    "HTTP/1.1 #{status}\r\n" +
    "Upgrade: websocket\r\n" +
    "Connection: Upgrade\r\n" +
    "#{header_str}\r\n#{extra_bytes}")
  flush()
  @handshaked = true
end

#hostObject



252
253
254
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 252

def host
  return @header["host"]
end

#locationObject



270
271
272
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 270

def location
  return "ws://#{self.host}#{@path}"
end

#originObject



256
257
258
259
260
261
262
263
264
265
266
267
268
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 256

def origin
  case @web_socket_version
    when "7", "8"
      name = "sec-websocket-origin"
    else
      name = "origin"
  end
  if @header[name]
    return @header[name]
  else
    raise(WebSocket::Error, "%s header is missing" % name)
  end
end

#receiveObject



181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 181

def receive()
  if !@handshaked
    raise(WebSocket::Error, "call WebSocket\#handshake first")
  end
  case @web_socket_version
    
    when "hixie-75", "hixie-76"
      packet = gets(force_encoding("\xff", "ASCII-8BIT"))
      return nil if !packet
      if packet =~ /\A\x00(.*)\xff\z/nm
        return force_encoding($1, "UTF-8")
      elsif packet == "\xff" && read(1) == "\x00" # closing
        close(1005, "", :peer)
        return nil
      else
        raise(WebSocket::Error, "input must be either '\\x00...\\xff' or '\\xff\\x00'")
      end
    
    else
      while true
        begin
          bytes = read(2).unpack("C*")
          fin = (bytes[0] & 0x80) != 0
          opcode = bytes[0] & 0x0f
          mask = (bytes[1] & 0x80) != 0
          plength = bytes[1] & 0x7f
          if plength == 126
            bytes = read(2)
            plength = bytes.unpack("n")[0]
          elsif plength == 127
            bytes = read(8)
            (high, low) = bytes.unpack("NN")
            plength = high * (2 ** 32) + low
          end
          if @server && !mask
            # Masking is required.
            @socket.close()
            raise(WebSocket::Error, "received unmasked data")
          end
          mask_key = mask ? read(4).unpack("C*") : nil
          payload = read(plength)
          payload = apply_mask(payload, mask_key) if mask
          if WebSocket.debug
            $stderr.printf("recv_frame> opcode:%d fin:%d payload:%p\n" % [opcode, fin ? 1 : 0, payload])
          end
          case opcode
            when OPCODE_TEXT
              return force_encoding(payload, "UTF-8")
            when OPCODE_BINARY
              raise(WebSocket::Error, "received binary data, which is not supported")
            when OPCODE_CLOSE
              close(1005, "", :peer)
              return nil
            when OPCODE_PING
              raise(WebSocket::Error, "received ping, which is not supported")
            when OPCODE_PONG
              next
            else
              raise(WebSocket::Error, "received unknown opcode: %d" % opcode)
          end
        rescue EOFError
          return nil
        end
      end
  end
end

#send(data) ⇒ Object



167
168
169
170
171
172
173
174
175
176
177
178
179
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 167

def send(data)
  if !@handshaked
    raise(WebSocket::Error, "call WebSocket\#handshake first")
  end
  case @web_socket_version
    when "hixie-75", "hixie-76"
      data = force_encoding(data.dup(), "ASCII-8BIT")
      write("\x00#{data}\xff")
      flush()
    else
      send_frame(OPCODE_TEXT, data, !@server)
  end
end

#tcp_socketObject



248
249
250
# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 248

def tcp_socket
  return @socket
end