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'use strict';
const { randomBytes } = require('crypto');
const PerMessageDeflate = require('./permessage-deflate');
const { EMPTY_BUFFER } = require('./constants');
const { isValidStatusCode } = require('./validation');
const { mask: applyMask, toBuffer } = require('./buffer-util');
/**
* HyBi Sender implementation.
*/
class Sender {
/**
* Creates a Sender instance.
*
* @param {net.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 Specifies whether `data` can be modified
* @param {Boolean} options.fin Specifies whether or not to set the FIN bit
* @param {Boolean} options.mask Specifies whether or not to mask `data`
* @param {Boolean} options.rsv1 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;
var offset = options.mask ? 6 : 2;
var 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];
const mask = randomBytes(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|undefined)} code The status code component of the body
* @param {String} data The message component of the body
* @param {Boolean} mask Specifies whether or not to mask the message
* @param {Function} cb Callback
* @public
*/
close(code, data, mask, cb) {
var 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 {
buf = Buffer.allocUnsafe(2 + Buffer.byteLength(data));
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 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 Specifies whether or not to mask `data`
* @param {Function} cb Callback
* @public
*/
ping(data, mask, cb) {
const buf = toBuffer(data);
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 {*} data The message to send
* @param {Boolean} mask Specifies whether or not to mask `data`
* @param {Boolean} readOnly 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 Specifies whether or not to mask `data`
* @param {Function} cb Callback
* @public
*/
pong(data, mask, cb) {
const buf = toBuffer(data);
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 {*} data The message to send
* @param {Boolean} mask Specifies whether or not to mask `data`
* @param {Boolean} readOnly 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 Specifies whether or not to compress `data`
* @param {Boolean} options.binary Specifies whether `data` is binary or text
* @param {Boolean} options.fin Specifies whether the fragment is the last one
* @param {Boolean} options.mask 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];
var opcode = options.binary ? 2 : 1;
var 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 Specifies whether or not to compress `data`
* @param {Object} options Options object
* @param {Number} options.opcode The opcode
* @param {Boolean} options.readOnly Specifies whether `data` can be modified
* @param {Boolean} options.fin Specifies whether or not to set the FIN bit
* @param {Boolean} options.mask Specifies whether or not to mask `data`
* @param {Boolean} options.rsv1 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._deflating = true;
perMessageDeflate.compress(data, options.fin, (_, buf) => {
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;
params[0].apply(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;