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Diffstat (limited to 'lib/websocket/websocket.js')
| -rw-r--r-- | lib/websocket/websocket.js | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/lib/websocket/websocket.js b/lib/websocket/websocket.js new file mode 100644 index 0000000..e4aa58f --- /dev/null +++ b/lib/websocket/websocket.js @@ -0,0 +1,641 @@ +'use strict' + +const { webidl } = require('../fetch/webidl') +const { DOMException } = require('../fetch/constants') +const { URLSerializer } = require('../fetch/dataURL') +const { getGlobalOrigin } = require('../fetch/global') +const { staticPropertyDescriptors, states, opcodes, emptyBuffer } = require('./constants') +const { + kWebSocketURL, + kReadyState, + kController, + kBinaryType, + kResponse, + kSentClose, + kByteParser +} = require('./symbols') +const { isEstablished, isClosing, isValidSubprotocol, failWebsocketConnection, fireEvent } = require('./util') +const { establishWebSocketConnection } = require('./connection') +const { WebsocketFrameSend } = require('./frame') +const { ByteParser } = require('./receiver') +const { kEnumerableProperty, isBlobLike } = require('../core/util') +const { getGlobalDispatcher } = require('../global') +const { types } = require('util') + +let experimentalWarned = false + +// https://websockets.spec.whatwg.org/#interface-definition +class WebSocket extends EventTarget { + #events = { + open: null, + error: null, + close: null, + message: null + } + + #bufferedAmount = 0 + #protocol = '' + #extensions = '' + + /** + * @param {string} url + * @param {string|string[]} protocols + */ + constructor (url, protocols = []) { + super() + + webidl.argumentLengthCheck(arguments, 1, { header: 'WebSocket constructor' }) + + if (!experimentalWarned) { + experimentalWarned = true + process.emitWarning('WebSockets are experimental, expect them to change at any time.', { + code: 'UNDICI-WS' + }) + } + + const options = webidl.converters['DOMString or sequence<DOMString> or WebSocketInit'](protocols) + + url = webidl.converters.USVString(url) + protocols = options.protocols + + // 1. Let baseURL be this's relevant settings object's API base URL. + const baseURL = getGlobalOrigin() + + // 1. Let urlRecord be the result of applying the URL parser to url with baseURL. + let urlRecord + + try { + urlRecord = new URL(url, baseURL) + } catch (e) { + // 3. If urlRecord is failure, then throw a "SyntaxError" DOMException. + throw new DOMException(e, 'SyntaxError') + } + + // 4. If urlRecord’s scheme is "http", then set urlRecord’s scheme to "ws". + if (urlRecord.protocol === 'http:') { + urlRecord.protocol = 'ws:' + } else if (urlRecord.protocol === 'https:') { + // 5. Otherwise, if urlRecord’s scheme is "https", set urlRecord’s scheme to "wss". + urlRecord.protocol = 'wss:' + } + + // 6. If urlRecord’s scheme is not "ws" or "wss", then throw a "SyntaxError" DOMException. + if (urlRecord.protocol !== 'ws:' && urlRecord.protocol !== 'wss:') { + throw new DOMException( + `Expected a ws: or wss: protocol, got ${urlRecord.protocol}`, + 'SyntaxError' + ) + } + + // 7. If urlRecord’s fragment is non-null, then throw a "SyntaxError" + // DOMException. + if (urlRecord.hash || urlRecord.href.endsWith('#')) { + throw new DOMException('Got fragment', 'SyntaxError') + } + + // 8. If protocols is a string, set protocols to a sequence consisting + // of just that string. + if (typeof protocols === 'string') { + protocols = [protocols] + } + + // 9. If any of the values in protocols occur more than once or otherwise + // fail to match the requirements for elements that comprise the value + // of `Sec-WebSocket-Protocol` fields as defined by The WebSocket + // protocol, then throw a "SyntaxError" DOMException. + if (protocols.length !== new Set(protocols.map(p => p.toLowerCase())).size) { + throw new DOMException('Invalid Sec-WebSocket-Protocol value', 'SyntaxError') + } + + if (protocols.length > 0 && !protocols.every(p => isValidSubprotocol(p))) { + throw new DOMException('Invalid Sec-WebSocket-Protocol value', 'SyntaxError') + } + + // 10. Set this's url to urlRecord. + this[kWebSocketURL] = new URL(urlRecord.href) + + // 11. Let client be this's relevant settings object. + + // 12. Run this step in parallel: + + // 1. Establish a WebSocket connection given urlRecord, protocols, + // and client. + this[kController] = establishWebSocketConnection( + urlRecord, + protocols, + this, + (response) => this.#onConnectionEstablished(response), + options + ) + + // Each WebSocket object has an associated ready state, which is a + // number representing the state of the connection. Initially it must + // be CONNECTING (0). + this[kReadyState] = WebSocket.CONNECTING + + // The extensions attribute must initially return the empty string. + + // The protocol attribute must initially return the empty string. + + // Each WebSocket object has an associated binary type, which is a + // BinaryType. Initially it must be "blob". + this[kBinaryType] = 'blob' + } + + /** + * @see https://websockets.spec.whatwg.org/#dom-websocket-close + * @param {number|undefined} code + * @param {string|undefined} reason + */ + close (code = undefined, reason = undefined) { + webidl.brandCheck(this, WebSocket) + + if (code !== undefined) { + code = webidl.converters['unsigned short'](code, { clamp: true }) + } + + if (reason !== undefined) { + reason = webidl.converters.USVString(reason) + } + + // 1. If code is present, but is neither an integer equal to 1000 nor an + // integer in the range 3000 to 4999, inclusive, throw an + // "InvalidAccessError" DOMException. + if (code !== undefined) { + if (code !== 1000 && (code < 3000 || code > 4999)) { + throw new DOMException('invalid code', 'InvalidAccessError') + } + } + + let reasonByteLength = 0 + + // 2. If reason is present, then run these substeps: + if (reason !== undefined) { + // 1. Let reasonBytes be the result of encoding reason. + // 2. If reasonBytes is longer than 123 bytes, then throw a + // "SyntaxError" DOMException. + reasonByteLength = Buffer.byteLength(reason) + + if (reasonByteLength > 123) { + throw new DOMException( + `Reason must be less than 123 bytes; received ${reasonByteLength}`, + 'SyntaxError' + ) + } + } + + // 3. Run the first matching steps from the following list: + if (this[kReadyState] === WebSocket.CLOSING || this[kReadyState] === WebSocket.CLOSED) { + // If this's ready state is CLOSING (2) or CLOSED (3) + // Do nothing. + } else if (!isEstablished(this)) { + // If the WebSocket connection is not yet established + // Fail the WebSocket connection and set this's ready state + // to CLOSING (2). + failWebsocketConnection(this, 'Connection was closed before it was established.') + this[kReadyState] = WebSocket.CLOSING + } else if (!isClosing(this)) { + // If the WebSocket closing handshake has not yet been started + // Start the WebSocket closing handshake and set this's ready + // state to CLOSING (2). + // - If neither code nor reason is present, the WebSocket Close + // message must not have a body. + // - If code is present, then the status code to use in the + // WebSocket Close message must be the integer given by code. + // - If reason is also present, then reasonBytes must be + // provided in the Close message after the status code. + + const frame = new WebsocketFrameSend() + + // If neither code nor reason is present, the WebSocket Close + // message must not have a body. + + // If code is present, then the status code to use in the + // WebSocket Close message must be the integer given by code. + if (code !== undefined && reason === undefined) { + frame.frameData = Buffer.allocUnsafe(2) + frame.frameData.writeUInt16BE(code, 0) + } else if (code !== undefined && reason !== undefined) { + // If reason is also present, then reasonBytes must be + // provided in the Close message after the status code. + frame.frameData = Buffer.allocUnsafe(2 + reasonByteLength) + frame.frameData.writeUInt16BE(code, 0) + // the body MAY contain UTF-8-encoded data with value /reason/ + frame.frameData.write(reason, 2, 'utf-8') + } else { + frame.frameData = emptyBuffer + } + + /** @type {import('stream').Duplex} */ + const socket = this[kResponse].socket + + socket.write(frame.createFrame(opcodes.CLOSE), (err) => { + if (!err) { + this[kSentClose] = true + } + }) + + // Upon either sending or receiving a Close control frame, it is said + // that _The WebSocket Closing Handshake is Started_ and that the + // WebSocket connection is in the CLOSING state. + this[kReadyState] = states.CLOSING + } else { + // Otherwise + // Set this's ready state to CLOSING (2). + this[kReadyState] = WebSocket.CLOSING + } + } + + /** + * @see https://websockets.spec.whatwg.org/#dom-websocket-send + * @param {NodeJS.TypedArray|ArrayBuffer|Blob|string} data + */ + send (data) { + webidl.brandCheck(this, WebSocket) + + webidl.argumentLengthCheck(arguments, 1, { header: 'WebSocket.send' }) + + data = webidl.converters.WebSocketSendData(data) + + // 1. If this's ready state is CONNECTING, then throw an + // "InvalidStateError" DOMException. + if (this[kReadyState] === WebSocket.CONNECTING) { + throw new DOMException('Sent before connected.', 'InvalidStateError') + } + + // 2. Run the appropriate set of steps from the following list: + // https://datatracker.ietf.org/doc/html/rfc6455#section-6.1 + // https://datatracker.ietf.org/doc/html/rfc6455#section-5.2 + + if (!isEstablished(this) || isClosing(this)) { + return + } + + /** @type {import('stream').Duplex} */ + const socket = this[kResponse].socket + + // If data is a string + if (typeof data === 'string') { + // If the WebSocket connection is established and the WebSocket + // closing handshake has not yet started, then the user agent + // must send a WebSocket Message comprised of the data argument + // using a text frame opcode; if the data cannot be sent, e.g. + // because it would need to be buffered but the buffer is full, + // the user agent must flag the WebSocket as full and then close + // the WebSocket connection. Any invocation of this method with a + // string argument that does not throw an exception must increase + // the bufferedAmount attribute by the number of bytes needed to + // express the argument as UTF-8. + + const value = Buffer.from(data) + const frame = new WebsocketFrameSend(value) + const buffer = frame.createFrame(opcodes.TEXT) + + this.#bufferedAmount += value.byteLength + socket.write(buffer, () => { + this.#bufferedAmount -= value.byteLength + }) + } else if (types.isArrayBuffer(data)) { + // If the WebSocket connection is established, and the WebSocket + // closing handshake has not yet started, then the user agent must + // send a WebSocket Message comprised of data using a binary frame + // opcode; if the data cannot be sent, e.g. because it would need + // to be buffered but the buffer is full, the user agent must flag + // the WebSocket as full and then close the WebSocket connection. + // The data to be sent is the data stored in the buffer described + // by the ArrayBuffer object. Any invocation of this method with an + // ArrayBuffer argument that does not throw an exception must + // increase the bufferedAmount attribute by the length of the + // ArrayBuffer in bytes. + + const value = Buffer.from(data) + const frame = new WebsocketFrameSend(value) + const buffer = frame.createFrame(opcodes.BINARY) + + this.#bufferedAmount += value.byteLength + socket.write(buffer, () => { + this.#bufferedAmount -= value.byteLength + }) + } else if (ArrayBuffer.isView(data)) { + // If the WebSocket connection is established, and the WebSocket + // closing handshake has not yet started, then the user agent must + // send a WebSocket Message comprised of data using a binary frame + // opcode; if the data cannot be sent, e.g. because it would need to + // be buffered but the buffer is full, the user agent must flag the + // WebSocket as full and then close the WebSocket connection. The + // data to be sent is the data stored in the section of the buffer + // described by the ArrayBuffer object that data references. Any + // invocation of this method with this kind of argument that does + // not throw an exception must increase the bufferedAmount attribute + // by the length of data’s buffer in bytes. + + const ab = Buffer.from(data, data.byteOffset, data.byteLength) + + const frame = new WebsocketFrameSend(ab) + const buffer = frame.createFrame(opcodes.BINARY) + + this.#bufferedAmount += ab.byteLength + socket.write(buffer, () => { + this.#bufferedAmount -= ab.byteLength + }) + } else if (isBlobLike(data)) { + // If the WebSocket connection is established, and the WebSocket + // closing handshake has not yet started, then the user agent must + // send a WebSocket Message comprised of data using a binary frame + // opcode; if the data cannot be sent, e.g. because it would need to + // be buffered but the buffer is full, the user agent must flag the + // WebSocket as full and then close the WebSocket connection. The data + // to be sent is the raw data represented by the Blob object. Any + // invocation of this method with a Blob argument that does not throw + // an exception must increase the bufferedAmount attribute by the size + // of the Blob object’s raw data, in bytes. + + const frame = new WebsocketFrameSend() + + data.arrayBuffer().then((ab) => { + const value = Buffer.from(ab) + frame.frameData = value + const buffer = frame.createFrame(opcodes.BINARY) + + this.#bufferedAmount += value.byteLength + socket.write(buffer, () => { + this.#bufferedAmount -= value.byteLength + }) + }) + } + } + + get readyState () { + webidl.brandCheck(this, WebSocket) + + // The readyState getter steps are to return this's ready state. + return this[kReadyState] + } + + get bufferedAmount () { + webidl.brandCheck(this, WebSocket) + + return this.#bufferedAmount + } + + get url () { + webidl.brandCheck(this, WebSocket) + + // The url getter steps are to return this's url, serialized. + return URLSerializer(this[kWebSocketURL]) + } + + get extensions () { + webidl.brandCheck(this, WebSocket) + + return this.#extensions + } + + get protocol () { + webidl.brandCheck(this, WebSocket) + + return this.#protocol + } + + get onopen () { + webidl.brandCheck(this, WebSocket) + + return this.#events.open + } + + set onopen (fn) { + webidl.brandCheck(this, WebSocket) + + if (this.#events.open) { + this.removeEventListener('open', this.#events.open) + } + + if (typeof fn === 'function') { + this.#events.open = fn + this.addEventListener('open', fn) + } else { + this.#events.open = null + } + } + + get onerror () { + webidl.brandCheck(this, WebSocket) + + return this.#events.error + } + + set onerror (fn) { + webidl.brandCheck(this, WebSocket) + + if (this.#events.error) { + this.removeEventListener('error', this.#events.error) + } + + if (typeof fn === 'function') { + this.#events.error = fn + this.addEventListener('error', fn) + } else { + this.#events.error = null + } + } + + get onclose () { + webidl.brandCheck(this, WebSocket) + + return this.#events.close + } + + set onclose (fn) { + webidl.brandCheck(this, WebSocket) + + if (this.#events.close) { + this.removeEventListener('close', this.#events.close) + } + + if (typeof fn === 'function') { + this.#events.close = fn + this.addEventListener('close', fn) + } else { + this.#events.close = null + } + } + + get onmessage () { + webidl.brandCheck(this, WebSocket) + + return this.#events.message + } + + set onmessage (fn) { + webidl.brandCheck(this, WebSocket) + + if (this.#events.message) { + this.removeEventListener('message', this.#events.message) + } + + if (typeof fn === 'function') { + this.#events.message = fn + this.addEventListener('message', fn) + } else { + this.#events.message = null + } + } + + get binaryType () { + webidl.brandCheck(this, WebSocket) + + return this[kBinaryType] + } + + set binaryType (type) { + webidl.brandCheck(this, WebSocket) + + if (type !== 'blob' && type !== 'arraybuffer') { + this[kBinaryType] = 'blob' + } else { + this[kBinaryType] = type + } + } + + /** + * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol + */ + #onConnectionEstablished (response) { + // processResponse is called when the "response’s header list has been received and initialized." + // once this happens, the connection is open + this[kResponse] = response + + const parser = new ByteParser(this) + parser.on('drain', function onParserDrain () { + this.ws[kResponse].socket.resume() + }) + + response.socket.ws = this + this[kByteParser] = parser + + // 1. Change the ready state to OPEN (1). + this[kReadyState] = states.OPEN + + // 2. Change the extensions attribute’s value to the extensions in use, if + // it is not the null value. + // https://datatracker.ietf.org/doc/html/rfc6455#section-9.1 + const extensions = response.headersList.get('sec-websocket-extensions') + + if (extensions !== null) { + this.#extensions = extensions + } + + // 3. Change the protocol attribute’s value to the subprotocol in use, if + // it is not the null value. + // https://datatracker.ietf.org/doc/html/rfc6455#section-1.9 + const protocol = response.headersList.get('sec-websocket-protocol') + + if (protocol !== null) { + this.#protocol = protocol + } + + // 4. Fire an event named open at the WebSocket object. + fireEvent('open', this) + } +} + +// https://websockets.spec.whatwg.org/#dom-websocket-connecting +WebSocket.CONNECTING = WebSocket.prototype.CONNECTING = states.CONNECTING +// https://websockets.spec.whatwg.org/#dom-websocket-open +WebSocket.OPEN = WebSocket.prototype.OPEN = states.OPEN +// https://websockets.spec.whatwg.org/#dom-websocket-closing +WebSocket.CLOSING = WebSocket.prototype.CLOSING = states.CLOSING +// https://websockets.spec.whatwg.org/#dom-websocket-closed +WebSocket.CLOSED = WebSocket.prototype.CLOSED = states.CLOSED + +Object.defineProperties(WebSocket.prototype, { + CONNECTING: staticPropertyDescriptors, + OPEN: staticPropertyDescriptors, + CLOSING: staticPropertyDescriptors, + CLOSED: staticPropertyDescriptors, + url: kEnumerableProperty, + readyState: kEnumerableProperty, + bufferedAmount: kEnumerableProperty, + onopen: kEnumerableProperty, + onerror: kEnumerableProperty, + onclose: kEnumerableProperty, + close: kEnumerableProperty, + onmessage: kEnumerableProperty, + binaryType: kEnumerableProperty, + send: kEnumerableProperty, + extensions: kEnumerableProperty, + protocol: kEnumerableProperty, + [Symbol.toStringTag]: { + value: 'WebSocket', + writable: false, + enumerable: false, + configurable: true + } +}) + +Object.defineProperties(WebSocket, { + CONNECTING: staticPropertyDescriptors, + OPEN: staticPropertyDescriptors, + CLOSING: staticPropertyDescriptors, + CLOSED: staticPropertyDescriptors +}) + +webidl.converters['sequence<DOMString>'] = webidl.sequenceConverter( + webidl.converters.DOMString +) + +webidl.converters['DOMString or sequence<DOMString>'] = function (V) { + if (webidl.util.Type(V) === 'Object' && Symbol.iterator in V) { + return webidl.converters['sequence<DOMString>'](V) + } + + return webidl.converters.DOMString(V) +} + +// This implements the propsal made in https://github.com/whatwg/websockets/issues/42 +webidl.converters.WebSocketInit = webidl.dictionaryConverter([ + { + key: 'protocols', + converter: webidl.converters['DOMString or sequence<DOMString>'], + get defaultValue () { + return [] + } + }, + { + key: 'dispatcher', + converter: (V) => V, + get defaultValue () { + return getGlobalDispatcher() + } + }, + { + key: 'headers', + converter: webidl.nullableConverter(webidl.converters.HeadersInit) + } +]) + +webidl.converters['DOMString or sequence<DOMString> or WebSocketInit'] = function (V) { + if (webidl.util.Type(V) === 'Object' && !(Symbol.iterator in V)) { + return webidl.converters.WebSocketInit(V) + } + + return { protocols: webidl.converters['DOMString or sequence<DOMString>'](V) } +} + +webidl.converters.WebSocketSendData = function (V) { + if (webidl.util.Type(V) === 'Object') { + if (isBlobLike(V)) { + return webidl.converters.Blob(V, { strict: false }) + } + + if (ArrayBuffer.isView(V) || types.isAnyArrayBuffer(V)) { + return webidl.converters.BufferSource(V) + } + } + + return webidl.converters.USVString(V) +} + +module.exports = { + WebSocket +} |