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475 lines
14 KiB
475 lines
14 KiB
'use strict';
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var crypto = require('crypto'),
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util = require('util'),
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Extensions = require('websocket-extensions'),
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Base = require('./base'),
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Frame = require('./hybi/frame'),
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Message = require('./hybi/message');
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var Hybi = function(request, url, options) {
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Base.apply(this, arguments);
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this._extensions = new Extensions();
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this._stage = 0;
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this._masking = this._options.masking;
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this._protocols = this._options.protocols || [];
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this._requireMasking = this._options.requireMasking;
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this._pingCallbacks = {};
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if (typeof this._protocols === 'string')
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this._protocols = this._protocols.split(/ *, */);
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if (!this._request) return;
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var secKey = this._request.headers['sec-websocket-key'],
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protos = this._request.headers['sec-websocket-protocol'],
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version = this._request.headers['sec-websocket-version'],
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supported = this._protocols;
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this._headers.set('Upgrade', 'websocket');
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this._headers.set('Connection', 'Upgrade');
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this._headers.set('Sec-WebSocket-Accept', Hybi.generateAccept(secKey));
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if (protos !== undefined) {
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if (typeof protos === 'string') protos = protos.split(/ *, */);
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this.protocol = protos.filter(function(p) { return supported.indexOf(p) >= 0 })[0];
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if (this.protocol) this._headers.set('Sec-WebSocket-Protocol', this.protocol);
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}
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this.version = 'hybi-' + version;
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};
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util.inherits(Hybi, Base);
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Hybi.mask = function(payload, mask, offset) {
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if (!mask || mask.length === 0) return payload;
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offset = offset || 0;
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for (var i = 0, n = payload.length - offset; i < n; i++) {
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payload[offset + i] = payload[offset + i] ^ mask[i % 4];
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}
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return payload;
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};
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Hybi.generateAccept = function(key) {
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var sha1 = crypto.createHash('sha1');
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sha1.update(key + Hybi.GUID);
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return sha1.digest('base64');
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};
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Hybi.GUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
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var instance = {
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FIN: 0x80,
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MASK: 0x80,
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RSV1: 0x40,
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RSV2: 0x20,
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RSV3: 0x10,
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OPCODE: 0x0F,
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LENGTH: 0x7F,
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OPCODES: {
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continuation: 0,
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text: 1,
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binary: 2,
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close: 8,
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ping: 9,
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pong: 10
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},
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OPCODE_CODES: [0, 1, 2, 8, 9, 10],
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MESSAGE_OPCODES: [0, 1, 2],
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OPENING_OPCODES: [1, 2],
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ERRORS: {
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normal_closure: 1000,
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going_away: 1001,
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protocol_error: 1002,
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unacceptable: 1003,
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encoding_error: 1007,
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policy_violation: 1008,
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too_large: 1009,
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extension_error: 1010,
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unexpected_condition: 1011
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},
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ERROR_CODES: [1000, 1001, 1002, 1003, 1007, 1008, 1009, 1010, 1011],
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DEFAULT_ERROR_CODE: 1000,
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MIN_RESERVED_ERROR: 3000,
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MAX_RESERVED_ERROR: 4999,
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// http://www.w3.org/International/questions/qa-forms-utf-8.en.php
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UTF8_MATCH: /^([\x00-\x7F]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF][\x80-\xBF]{2}|[\xF1-\xF3][\x80-\xBF]{3}|\xF4[\x80-\x8F][\x80-\xBF]{2})*$/,
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addExtension: function(extension) {
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this._extensions.add(extension);
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return true;
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},
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parse: function(chunk) {
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this._reader.put(chunk);
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var buffer = true;
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while (buffer) {
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switch (this._stage) {
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case 0:
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buffer = this._reader.read(1);
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if (buffer) this._parseOpcode(buffer[0]);
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break;
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case 1:
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buffer = this._reader.read(1);
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if (buffer) this._parseLength(buffer[0]);
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break;
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case 2:
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buffer = this._reader.read(this._frame.lengthBytes);
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if (buffer) this._parseExtendedLength(buffer);
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break;
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case 3:
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buffer = this._reader.read(4);
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if (buffer) {
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this._stage = 4;
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this._frame.maskingKey = buffer;
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}
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break;
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case 4:
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buffer = this._reader.read(this._frame.length);
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if (buffer) {
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this._stage = 0;
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this._emitFrame(buffer);
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}
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break;
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default:
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buffer = null;
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}
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}
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},
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text: function(message) {
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if (this.readyState > 1) return false;
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return this.frame(message, 'text');
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},
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binary: function(message) {
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if (this.readyState > 1) return false;
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return this.frame(message, 'binary');
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},
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ping: function(message, callback) {
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if (this.readyState > 1) return false;
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message = message || '';
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if (callback) this._pingCallbacks[message] = callback;
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return this.frame(message, 'ping');
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},
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pong: function(message) {
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if (this.readyState > 1) return false;
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message = message ||'';
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return this.frame(message, 'pong');
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},
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close: function(reason, code) {
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reason = reason || '';
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code = code || this.ERRORS.normal_closure;
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if (this.readyState <= 0) {
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this.readyState = 3;
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this.emit('close', new Base.CloseEvent(code, reason));
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return true;
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} else if (this.readyState === 1) {
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this.readyState = 2;
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this._extensions.close(function() { this.frame(reason, 'close', code) }, this);
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return true;
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} else {
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return false;
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}
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},
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frame: function(buffer, type, code) {
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if (this.readyState <= 0) return this._queue([buffer, type, code]);
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if (this.readyState > 2) return false;
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if (buffer instanceof Array) buffer = new Buffer(buffer);
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if (typeof buffer === 'number') buffer = buffer.toString();
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var message = new Message(),
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isText = (typeof buffer === 'string'),
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payload, copy;
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message.rsv1 = message.rsv2 = message.rsv3 = false;
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message.opcode = this.OPCODES[type || (isText ? 'text' : 'binary')];
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payload = isText ? new Buffer(buffer, 'utf8') : buffer;
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if (code) {
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copy = payload;
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payload = new Buffer(2 + copy.length);
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payload.writeUInt16BE(code, 0);
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copy.copy(payload, 2);
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}
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message.data = payload;
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var onMessageReady = function(message) {
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var frame = new Frame();
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frame.final = true;
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frame.rsv1 = message.rsv1;
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frame.rsv2 = message.rsv2;
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frame.rsv3 = message.rsv3;
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frame.opcode = message.opcode;
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frame.masked = !!this._masking;
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frame.length = message.data.length;
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frame.payload = message.data;
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if (frame.masked) frame.maskingKey = crypto.randomBytes(4);
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this._sendFrame(frame);
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};
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if (this.MESSAGE_OPCODES.indexOf(message.opcode) >= 0)
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this._extensions.processOutgoingMessage(message, function(error, message) {
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if (error) return this._fail('extension_error', error.message);
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onMessageReady.call(this, message);
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}, this);
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else
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onMessageReady.call(this, message);
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return true;
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},
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_sendFrame: function(frame) {
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var length = frame.length,
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header = (length <= 125) ? 2 : (length <= 65535 ? 4 : 10),
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offset = header + (frame.masked ? 4 : 0),
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buffer = new Buffer(offset + length),
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masked = frame.masked ? this.MASK : 0;
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buffer[0] = (frame.final ? this.FIN : 0) |
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(frame.rsv1 ? this.RSV1 : 0) |
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(frame.rsv2 ? this.RSV2 : 0) |
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(frame.rsv3 ? this.RSV3 : 0) |
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frame.opcode;
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if (length <= 125) {
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buffer[1] = masked | length;
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} else if (length <= 65535) {
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buffer[1] = masked | 126;
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buffer.writeUInt16BE(length, 2);
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} else {
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buffer[1] = masked | 127;
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buffer.writeUInt32BE(Math.floor(length / 0x100000000), 2);
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buffer.writeUInt32BE(length % 0x100000000, 6);
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}
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frame.payload.copy(buffer, offset);
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if (frame.masked) {
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frame.maskingKey.copy(buffer, header);
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Hybi.mask(buffer, frame.maskingKey, offset);
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}
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this._write(buffer);
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},
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_handshakeResponse: function() {
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try {
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var extensions = this._extensions.generateResponse(this._request.headers['sec-websocket-extensions']);
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} catch (e) {
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return this._fail('protocol_error', e.message);
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}
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if (extensions) this._headers.set('Sec-WebSocket-Extensions', extensions);
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var start = 'HTTP/1.1 101 Switching Protocols',
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headers = [start, this._headers.toString(), ''];
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return new Buffer(headers.join('\r\n'), 'utf8');
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},
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_shutdown: function(code, reason, error) {
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delete this._frame;
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delete this._message;
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this._stage = 5;
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var sendCloseFrame = (this.readyState === 1);
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this.readyState = 2;
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this._extensions.close(function() {
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if (sendCloseFrame) this.frame(reason, 'close', code);
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this.readyState = 3;
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if (error) this.emit('error', new Error(reason));
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this.emit('close', new Base.CloseEvent(code, reason));
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}, this);
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},
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_fail: function(type, message) {
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if (this.readyState > 1) return;
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this._shutdown(this.ERRORS[type], message, true);
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},
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_parseOpcode: function(octet) {
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var rsvs = [this.RSV1, this.RSV2, this.RSV3].map(function(rsv) {
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return (octet & rsv) === rsv;
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});
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var frame = this._frame = new Frame();
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frame.final = (octet & this.FIN) === this.FIN;
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frame.rsv1 = rsvs[0];
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frame.rsv2 = rsvs[1];
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frame.rsv3 = rsvs[2];
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frame.opcode = (octet & this.OPCODE);
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this._stage = 1;
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if (!this._extensions.validFrameRsv(frame))
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return this._fail('protocol_error',
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'One or more reserved bits are on: reserved1 = ' + (frame.rsv1 ? 1 : 0) +
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', reserved2 = ' + (frame.rsv2 ? 1 : 0) +
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', reserved3 = ' + (frame.rsv3 ? 1 : 0));
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if (this.OPCODE_CODES.indexOf(frame.opcode) < 0)
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return this._fail('protocol_error', 'Unrecognized frame opcode: ' + frame.opcode);
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if (this.MESSAGE_OPCODES.indexOf(frame.opcode) < 0 && !frame.final)
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return this._fail('protocol_error', 'Received fragmented control frame: opcode = ' + frame.opcode);
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if (this._message && this.OPENING_OPCODES.indexOf(frame.opcode) >= 0)
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return this._fail('protocol_error', 'Received new data frame but previous continuous frame is unfinished');
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},
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_parseLength: function(octet) {
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var frame = this._frame;
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frame.masked = (octet & this.MASK) === this.MASK;
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frame.length = (octet & this.LENGTH);
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if (frame.length >= 0 && frame.length <= 125) {
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this._stage = frame.masked ? 3 : 4;
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if (!this._checkFrameLength()) return;
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} else {
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this._stage = 2;
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frame.lengthBytes = (frame.length === 126 ? 2 : 8);
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}
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if (this._requireMasking && !frame.masked)
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return this._fail('unacceptable', 'Received unmasked frame but masking is required');
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},
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_parseExtendedLength: function(buffer) {
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var frame = this._frame;
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frame.length = this._readUInt(buffer);
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this._stage = frame.masked ? 3 : 4;
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if (this.MESSAGE_OPCODES.indexOf(frame.opcode) < 0 && frame.length > 125)
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return this._fail('protocol_error', 'Received control frame having too long payload: ' + frame.length);
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if (!this._checkFrameLength()) return;
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},
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_checkFrameLength: function() {
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var length = this._message ? this._message.length : 0;
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if (length + this._frame.length > this._maxLength) {
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this._fail('too_large', 'WebSocket frame length too large');
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return false;
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} else {
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return true;
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}
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},
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_emitFrame: function(buffer) {
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var frame = this._frame,
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payload = frame.payload = Hybi.mask(buffer, frame.maskingKey),
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opcode = frame.opcode,
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message,
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code, reason,
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callbacks, callback;
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delete this._frame;
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if (opcode === this.OPCODES.continuation) {
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if (!this._message) return this._fail('protocol_error', 'Received unexpected continuation frame');
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this._message.pushFrame(frame);
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}
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if (opcode === this.OPCODES.text || opcode === this.OPCODES.binary) {
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this._message = new Message();
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this._message.pushFrame(frame);
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}
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if (frame.final && this.MESSAGE_OPCODES.indexOf(opcode) >= 0)
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return this._emitMessage(this._message);
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if (opcode === this.OPCODES.close) {
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code = (payload.length >= 2) ? payload.readUInt16BE(0) : null;
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reason = (payload.length > 2) ? this._encode(payload.slice(2)) : null;
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if (!(payload.length === 0) &&
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!(code !== null && code >= this.MIN_RESERVED_ERROR && code <= this.MAX_RESERVED_ERROR) &&
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this.ERROR_CODES.indexOf(code) < 0)
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code = this.ERRORS.protocol_error;
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if (payload.length > 125 || (payload.length > 2 && !reason))
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code = this.ERRORS.protocol_error;
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this._shutdown(code || this.DEFAULT_ERROR_CODE, reason || '');
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}
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if (opcode === this.OPCODES.ping) {
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this.frame(payload, 'pong');
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}
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if (opcode === this.OPCODES.pong) {
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callbacks = this._pingCallbacks;
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message = this._encode(payload);
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callback = callbacks[message];
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delete callbacks[message];
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if (callback) callback()
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}
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},
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_emitMessage: function(message) {
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var message = this._message;
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message.read();
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delete this._message;
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this._extensions.processIncomingMessage(message, function(error, message) {
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if (error) return this._fail('extension_error', error.message);
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var payload = message.data;
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if (message.opcode === this.OPCODES.text) payload = this._encode(payload);
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if (payload === null)
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return this._fail('encoding_error', 'Could not decode a text frame as UTF-8');
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else
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this.emit('message', new Base.MessageEvent(payload));
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}, this);
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},
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_encode: function(buffer) {
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try {
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var string = buffer.toString('binary', 0, buffer.length);
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if (!this.UTF8_MATCH.test(string)) return null;
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} catch (e) {}
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return buffer.toString('utf8', 0, buffer.length);
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},
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_readUInt: function(buffer) {
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if (buffer.length === 2) return buffer.readUInt16BE(0);
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return buffer.readUInt32BE(0) * 0x100000000 +
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buffer.readUInt32BE(4);
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}
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};
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for (var key in instance)
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Hybi.prototype[key] = instance[key];
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module.exports = Hybi;
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