410 lines
11 KiB
JavaScript
410 lines
11 KiB
JavaScript
/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^net|tls$" }] */
|
|
|
|
'use strict';
|
|
|
|
const net = require('net');
|
|
const tls = require('tls');
|
|
const { randomFillSync } = require('crypto');
|
|
|
|
const PerMessageDeflate = require('./permessage-deflate');
|
|
const { EMPTY_BUFFER } = require('./constants');
|
|
const { isValidStatusCode } = require('./validation');
|
|
const { mask: applyMask, toBuffer } = require('./buffer-util');
|
|
|
|
const mask = Buffer.alloc(4);
|
|
|
|
/**
|
|
* HyBi Sender implementation.
|
|
*/
|
|
class Sender {
|
|
/**
|
|
* Creates a Sender instance.
|
|
*
|
|
* @param {(net.Socket|tls.Socket)} socket The connection socket
|
|
* @param {Object} [extensions] An object containing the negotiated extensions
|
|
*/
|
|
constructor(socket, extensions) {
|
|
this._extensions = extensions || {};
|
|
this._socket = socket;
|
|
|
|
this._firstFragment = true;
|
|
this._compress = false;
|
|
|
|
this._bufferedBytes = 0;
|
|
this._deflating = false;
|
|
this._queue = [];
|
|
}
|
|
|
|
/**
|
|
* Frames a piece of data according to the HyBi WebSocket protocol.
|
|
*
|
|
* @param {Buffer} data The data to frame
|
|
* @param {Object} options Options object
|
|
* @param {Number} options.opcode The opcode
|
|
* @param {Boolean} [options.readOnly=false] Specifies whether `data` can be
|
|
* modified
|
|
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
|
|
* FIN bit
|
|
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
|
|
* `data`
|
|
* @param {Boolean} [options.rsv1=false] Specifies whether or not to set the
|
|
* RSV1 bit
|
|
* @return {Buffer[]} The framed data as a list of `Buffer` instances
|
|
* @public
|
|
*/
|
|
static frame(data, options) {
|
|
const merge = options.mask && options.readOnly;
|
|
let offset = options.mask ? 6 : 2;
|
|
let payloadLength = data.length;
|
|
|
|
if (data.length >= 65536) {
|
|
offset += 8;
|
|
payloadLength = 127;
|
|
} else if (data.length > 125) {
|
|
offset += 2;
|
|
payloadLength = 126;
|
|
}
|
|
|
|
const target = Buffer.allocUnsafe(merge ? data.length + offset : offset);
|
|
|
|
target[0] = options.fin ? options.opcode | 0x80 : options.opcode;
|
|
if (options.rsv1) target[0] |= 0x40;
|
|
|
|
target[1] = payloadLength;
|
|
|
|
if (payloadLength === 126) {
|
|
target.writeUInt16BE(data.length, 2);
|
|
} else if (payloadLength === 127) {
|
|
target.writeUInt32BE(0, 2);
|
|
target.writeUInt32BE(data.length, 6);
|
|
}
|
|
|
|
if (!options.mask) return [target, data];
|
|
|
|
randomFillSync(mask, 0, 4);
|
|
|
|
target[1] |= 0x80;
|
|
target[offset - 4] = mask[0];
|
|
target[offset - 3] = mask[1];
|
|
target[offset - 2] = mask[2];
|
|
target[offset - 1] = mask[3];
|
|
|
|
if (merge) {
|
|
applyMask(data, mask, target, offset, data.length);
|
|
return [target];
|
|
}
|
|
|
|
applyMask(data, mask, data, 0, data.length);
|
|
return [target, data];
|
|
}
|
|
|
|
/**
|
|
* Sends a close message to the other peer.
|
|
*
|
|
* @param {Number} [code] The status code component of the body
|
|
* @param {String} [data] The message component of the body
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask the message
|
|
* @param {Function} [cb] Callback
|
|
* @public
|
|
*/
|
|
close(code, data, mask, cb) {
|
|
let buf;
|
|
|
|
if (code === undefined) {
|
|
buf = EMPTY_BUFFER;
|
|
} else if (typeof code !== 'number' || !isValidStatusCode(code)) {
|
|
throw new TypeError('First argument must be a valid error code number');
|
|
} else if (data === undefined || data === '') {
|
|
buf = Buffer.allocUnsafe(2);
|
|
buf.writeUInt16BE(code, 0);
|
|
} else {
|
|
const length = Buffer.byteLength(data);
|
|
|
|
if (length > 123) {
|
|
throw new RangeError('The message must not be greater than 123 bytes');
|
|
}
|
|
|
|
buf = Buffer.allocUnsafe(2 + length);
|
|
buf.writeUInt16BE(code, 0);
|
|
buf.write(data, 2);
|
|
}
|
|
|
|
if (this._deflating) {
|
|
this.enqueue([this.doClose, buf, mask, cb]);
|
|
} else {
|
|
this.doClose(buf, mask, cb);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Frames and sends a close message.
|
|
*
|
|
* @param {Buffer} data The message to send
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
|
|
* @param {Function} [cb] Callback
|
|
* @private
|
|
*/
|
|
doClose(data, mask, cb) {
|
|
this.sendFrame(
|
|
Sender.frame(data, {
|
|
fin: true,
|
|
rsv1: false,
|
|
opcode: 0x08,
|
|
mask,
|
|
readOnly: false
|
|
}),
|
|
cb
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Sends a ping message to the other peer.
|
|
*
|
|
* @param {*} data The message to send
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
|
|
* @param {Function} [cb] Callback
|
|
* @public
|
|
*/
|
|
ping(data, mask, cb) {
|
|
const buf = toBuffer(data);
|
|
|
|
if (buf.length > 125) {
|
|
throw new RangeError('The data size must not be greater than 125 bytes');
|
|
}
|
|
|
|
if (this._deflating) {
|
|
this.enqueue([this.doPing, buf, mask, toBuffer.readOnly, cb]);
|
|
} else {
|
|
this.doPing(buf, mask, toBuffer.readOnly, cb);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Frames and sends a ping message.
|
|
*
|
|
* @param {Buffer} data The message to send
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
|
|
* @param {Boolean} [readOnly=false] Specifies whether `data` can be modified
|
|
* @param {Function} [cb] Callback
|
|
* @private
|
|
*/
|
|
doPing(data, mask, readOnly, cb) {
|
|
this.sendFrame(
|
|
Sender.frame(data, {
|
|
fin: true,
|
|
rsv1: false,
|
|
opcode: 0x09,
|
|
mask,
|
|
readOnly
|
|
}),
|
|
cb
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Sends a pong message to the other peer.
|
|
*
|
|
* @param {*} data The message to send
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
|
|
* @param {Function} [cb] Callback
|
|
* @public
|
|
*/
|
|
pong(data, mask, cb) {
|
|
const buf = toBuffer(data);
|
|
|
|
if (buf.length > 125) {
|
|
throw new RangeError('The data size must not be greater than 125 bytes');
|
|
}
|
|
|
|
if (this._deflating) {
|
|
this.enqueue([this.doPong, buf, mask, toBuffer.readOnly, cb]);
|
|
} else {
|
|
this.doPong(buf, mask, toBuffer.readOnly, cb);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Frames and sends a pong message.
|
|
*
|
|
* @param {Buffer} data The message to send
|
|
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
|
|
* @param {Boolean} [readOnly=false] Specifies whether `data` can be modified
|
|
* @param {Function} [cb] Callback
|
|
* @private
|
|
*/
|
|
doPong(data, mask, readOnly, cb) {
|
|
this.sendFrame(
|
|
Sender.frame(data, {
|
|
fin: true,
|
|
rsv1: false,
|
|
opcode: 0x0a,
|
|
mask,
|
|
readOnly
|
|
}),
|
|
cb
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Sends a data message to the other peer.
|
|
*
|
|
* @param {*} data The message to send
|
|
* @param {Object} options Options object
|
|
* @param {Boolean} [options.compress=false] Specifies whether or not to
|
|
* compress `data`
|
|
* @param {Boolean} [options.binary=false] Specifies whether `data` is binary
|
|
* or text
|
|
* @param {Boolean} [options.fin=false] Specifies whether the fragment is the
|
|
* last one
|
|
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
|
|
* `data`
|
|
* @param {Function} [cb] Callback
|
|
* @public
|
|
*/
|
|
send(data, options, cb) {
|
|
const buf = toBuffer(data);
|
|
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
|
|
let opcode = options.binary ? 2 : 1;
|
|
let rsv1 = options.compress;
|
|
|
|
if (this._firstFragment) {
|
|
this._firstFragment = false;
|
|
if (rsv1 && perMessageDeflate) {
|
|
rsv1 = buf.length >= perMessageDeflate._threshold;
|
|
}
|
|
this._compress = rsv1;
|
|
} else {
|
|
rsv1 = false;
|
|
opcode = 0;
|
|
}
|
|
|
|
if (options.fin) this._firstFragment = true;
|
|
|
|
if (perMessageDeflate) {
|
|
const opts = {
|
|
fin: options.fin,
|
|
rsv1,
|
|
opcode,
|
|
mask: options.mask,
|
|
readOnly: toBuffer.readOnly
|
|
};
|
|
|
|
if (this._deflating) {
|
|
this.enqueue([this.dispatch, buf, this._compress, opts, cb]);
|
|
} else {
|
|
this.dispatch(buf, this._compress, opts, cb);
|
|
}
|
|
} else {
|
|
this.sendFrame(
|
|
Sender.frame(buf, {
|
|
fin: options.fin,
|
|
rsv1: false,
|
|
opcode,
|
|
mask: options.mask,
|
|
readOnly: toBuffer.readOnly
|
|
}),
|
|
cb
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Dispatches a data message.
|
|
*
|
|
* @param {Buffer} data The message to send
|
|
* @param {Boolean} [compress=false] Specifies whether or not to compress
|
|
* `data`
|
|
* @param {Object} options Options object
|
|
* @param {Number} options.opcode The opcode
|
|
* @param {Boolean} [options.readOnly=false] Specifies whether `data` can be
|
|
* modified
|
|
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
|
|
* FIN bit
|
|
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
|
|
* `data`
|
|
* @param {Boolean} [options.rsv1=false] Specifies whether or not to set the
|
|
* RSV1 bit
|
|
* @param {Function} [cb] Callback
|
|
* @private
|
|
*/
|
|
dispatch(data, compress, options, cb) {
|
|
if (!compress) {
|
|
this.sendFrame(Sender.frame(data, options), cb);
|
|
return;
|
|
}
|
|
|
|
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
|
|
|
|
this._bufferedBytes += data.length;
|
|
this._deflating = true;
|
|
perMessageDeflate.compress(data, options.fin, (_, buf) => {
|
|
if (this._socket.destroyed) {
|
|
const err = new Error(
|
|
'The socket was closed while data was being compressed'
|
|
);
|
|
|
|
if (typeof cb === 'function') cb(err);
|
|
|
|
for (let i = 0; i < this._queue.length; i++) {
|
|
const callback = this._queue[i][4];
|
|
|
|
if (typeof callback === 'function') callback(err);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
this._bufferedBytes -= data.length;
|
|
this._deflating = false;
|
|
options.readOnly = false;
|
|
this.sendFrame(Sender.frame(buf, options), cb);
|
|
this.dequeue();
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Executes queued send operations.
|
|
*
|
|
* @private
|
|
*/
|
|
dequeue() {
|
|
while (!this._deflating && this._queue.length) {
|
|
const params = this._queue.shift();
|
|
|
|
this._bufferedBytes -= params[1].length;
|
|
Reflect.apply(params[0], this, params.slice(1));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Enqueues a send operation.
|
|
*
|
|
* @param {Array} params Send operation parameters.
|
|
* @private
|
|
*/
|
|
enqueue(params) {
|
|
this._bufferedBytes += params[1].length;
|
|
this._queue.push(params);
|
|
}
|
|
|
|
/**
|
|
* Sends a frame.
|
|
*
|
|
* @param {Buffer[]} list The frame to send
|
|
* @param {Function} [cb] Callback
|
|
* @private
|
|
*/
|
|
sendFrame(list, cb) {
|
|
if (list.length === 2) {
|
|
this._socket.cork();
|
|
this._socket.write(list[0]);
|
|
this._socket.write(list[1], cb);
|
|
this._socket.uncork();
|
|
} else {
|
|
this._socket.write(list[0], cb);
|
|
}
|
|
}
|
|
}
|
|
|
|
module.exports = Sender;
|