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diff --git a/testing/xpcshell/node-ws/doc/ws.md b/testing/xpcshell/node-ws/doc/ws.md new file mode 100644 index 0000000000..4888ee4c6f --- /dev/null +++ b/testing/xpcshell/node-ws/doc/ws.md @@ -0,0 +1,669 @@ +# ws + +## Table of Contents + +- [Class: WebSocketServer](#class-websocketserver) + - [new WebSocketServer(options[, callback])](#new-websocketserveroptions-callback) + - [Event: 'close'](#event-close) + - [Event: 'connection'](#event-connection) + - [Event: 'error'](#event-error) + - [Event: 'headers'](#event-headers) + - [Event: 'listening'](#event-listening) + - [Event: 'wsClientError'](#event-wsclienterror) + - [server.address()](#serveraddress) + - [server.clients](#serverclients) + - [server.close([callback])](#serverclosecallback) + - [server.handleUpgrade(request, socket, head, callback)](#serverhandleupgraderequest-socket-head-callback) + - [server.shouldHandle(request)](#servershouldhandlerequest) +- [Class: WebSocket](#class-websocket) + - [Ready state constants](#ready-state-constants) + - [new WebSocket(address[, protocols][, options])](#new-websocketaddress-protocols-options) + - [UNIX Domain Sockets](#unix-domain-sockets) + - [Event: 'close'](#event-close-1) + - [Event: 'error'](#event-error-1) + - [Event: 'message'](#event-message) + - [Event: 'open'](#event-open) + - [Event: 'ping'](#event-ping) + - [Event: 'pong'](#event-pong) + - [Event: 'redirect'](#event-redirect) + - [Event: 'unexpected-response'](#event-unexpected-response) + - [Event: 'upgrade'](#event-upgrade) + - [websocket.addEventListener(type, listener[, options])](#websocketaddeventlistenertype-listener-options) + - [websocket.binaryType](#websocketbinarytype) + - [websocket.bufferedAmount](#websocketbufferedamount) + - [websocket.close([code[, reason]])](#websocketclosecode-reason) + - [websocket.extensions](#websocketextensions) + - [websocket.isPaused](#websocketispaused) + - [websocket.onclose](#websocketonclose) + - [websocket.onerror](#websocketonerror) + - [websocket.onmessage](#websocketonmessage) + - [websocket.onopen](#websocketonopen) + - [websocket.pause()](#websocketpause) + - [websocket.ping([data[, mask]][, callback])](#websocketpingdata-mask-callback) + - [websocket.pong([data[, mask]][, callback])](#websocketpongdata-mask-callback) + - [websocket.protocol](#websocketprotocol) + - [websocket.readyState](#websocketreadystate) + - [websocket.removeEventListener(type, listener)](#websocketremoveeventlistenertype-listener) + - [websocket.resume()](#websocketresume) + - [websocket.send(data[, options][, callback])](#websocketsenddata-options-callback) + - [websocket.terminate()](#websocketterminate) + - [websocket.url](#websocketurl) +- [createWebSocketStream(websocket[, options])](#createwebsocketstreamwebsocket-options) +- [Environment variables](#environment-variables) + - [WS_NO_BUFFER_UTIL](#ws_no_buffer_util) + - [WS_NO_UTF_8_VALIDATE](#ws_no_utf_8_validate) +- [Error codes](#error-codes) + - [WS_ERR_EXPECTED_FIN](#ws_err_expected_fin) + - [WS_ERR_EXPECTED_MASK](#ws_err_expected_mask) + - [WS_ERR_INVALID_CLOSE_CODE](#ws_err_invalid_close_code) + - [WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH](#ws_err_invalid_control_payload_length) + - [WS_ERR_INVALID_OPCODE](#ws_err_invalid_opcode) + - [WS_ERR_INVALID_UTF8](#ws_err_invalid_utf8) + - [WS_ERR_UNEXPECTED_MASK](#ws_err_unexpected_mask) + - [WS_ERR_UNEXPECTED_RSV_1](#ws_err_unexpected_rsv_1) + - [WS_ERR_UNEXPECTED_RSV_2_3](#ws_err_unexpected_rsv_2_3) + - [WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH](#ws_err_unsupported_data_payload_length) + - [WS_ERR_UNSUPPORTED_MESSAGE_LENGTH](#ws_err_unsupported_message_length) + +## Class: WebSocketServer + +This class represents a WebSocket server. It extends the `EventEmitter`. + +### new WebSocketServer(options[, callback]) + +- `options` {Object} + - `backlog` {Number} The maximum length of the queue of pending connections. + - `clientTracking` {Boolean} Specifies whether or not to track clients. + - `handleProtocols` {Function} A function which can be used to handle the + WebSocket subprotocols. See description below. + - `host` {String} The hostname where to bind the server. + - `maxPayload` {Number} The maximum allowed message size in bytes. Defaults to + 100 MiB (104857600 bytes). + - `noServer` {Boolean} Enable no server mode. + - `path` {String} Accept only connections matching this path. + - `perMessageDeflate` {Boolean|Object} Enable/disable permessage-deflate. + - `port` {Number} The port where to bind the server. + - `server` {http.Server|https.Server} A pre-created Node.js HTTP/S server. + - `skipUTF8Validation` {Boolean} Specifies whether or not to skip UTF-8 + validation for text and close messages. Defaults to `false`. Set to `true` + only if clients are trusted. + - `verifyClient` {Function} A function which can be used to validate incoming + connections. See description below. (Usage is discouraged: see + [Issue #337](https://github.com/websockets/ws/issues/377#issuecomment-462152231)) + - `WebSocket` {Function} Specifies the `WebSocket` class to be used. It must + be extended from the original `WebSocket`. Defaults to `WebSocket`. +- `callback` {Function} + +Create a new server instance. One and only one of `port`, `server` or `noServer` +must be provided or an error is thrown. An HTTP server is automatically created, +started, and used if `port` is set. To use an external HTTP/S server instead, +specify only `server` or `noServer`. In this case the HTTP/S server must be +started manually. The "noServer" mode allows the WebSocket server to be +completely detached from the HTTP/S server. This makes it possible, for example, +to share a single HTTP/S server between multiple WebSocket servers. + +> **NOTE:** Use of `verifyClient` is discouraged. Rather handle client +> authentication in the `upgrade` event of the HTTP server. See examples for +> more details. + +If `verifyClient` is not set then the handshake is automatically accepted. If it +has a single parameter then `ws` will invoke it with the following argument: + +- `info` {Object} + - `origin` {String} The value in the Origin header indicated by the client. + - `req` {http.IncomingMessage} The client HTTP GET request. + - `secure` {Boolean} `true` if `req.socket.authorized` or + `req.socket.encrypted` is set. + +The return value (`Boolean`) of the function determines whether or not to accept +the handshake. + +If `verifyClient` has two parameters then `ws` will invoke it with the following +arguments: + +- `info` {Object} Same as above. +- `cb` {Function} A callback that must be called by the user upon inspection of + the `info` fields. Arguments in this callback are: + - `result` {Boolean} Whether or not to accept the handshake. + - `code` {Number} When `result` is `false` this field determines the HTTP + error status code to be sent to the client. + - `name` {String} When `result` is `false` this field determines the HTTP + reason phrase. + - `headers` {Object} When `result` is `false` this field determines additional + HTTP headers to be sent to the client. For example, + `{ 'Retry-After': 120 }`. + +`handleProtocols` takes two arguments: + +- `protocols` {Set} The list of WebSocket subprotocols indicated by the client + in the `Sec-WebSocket-Protocol` header. +- `request` {http.IncomingMessage} The client HTTP GET request. + +The returned value sets the value of the `Sec-WebSocket-Protocol` header in the +HTTP 101 response. If returned value is `false` the header is not added in the +response. + +If `handleProtocols` is not set then the first of the client's requested +subprotocols is used. + +`perMessageDeflate` can be used to control the behavior of [permessage-deflate +extension][permessage-deflate]. The extension is disabled when `false` (default +value). If an object is provided then that is extension parameters: + +- `serverNoContextTakeover` {Boolean} Whether to use context takeover or not. +- `clientNoContextTakeover` {Boolean} Acknowledge disabling of client context + takeover. +- `serverMaxWindowBits` {Number} The value of `windowBits`. +- `clientMaxWindowBits` {Number} Request a custom client window size. +- `zlibDeflateOptions` {Object} [Additional options][zlib-options] to pass to + zlib on deflate. +- `zlibInflateOptions` {Object} [Additional options][zlib-options] to pass to + zlib on inflate. +- `threshold` {Number} Payloads smaller than this will not be compressed if + context takeover is disabled. Defaults to 1024 bytes. +- `concurrencyLimit` {Number} The number of concurrent calls to zlib. Calls + above this limit will be queued. Default 10. You usually won't need to touch + this option. See [this issue][concurrency-limit] for more details. + +If a property is empty then either an offered configuration or a default value +is used. When sending a fragmented message the length of the first fragment is +compared to the threshold. This determines if compression is used for the entire +message. + +`callback` will be added as a listener for the `listening` event on the HTTP +server when not operating in "noServer" mode. + +### Event: 'close' + +Emitted when the server closes. This event depends on the `'close'` event of +HTTP server only when it is created internally. In all other cases, the event is +emitted independently. + +### Event: 'connection' + +- `websocket` {WebSocket} +- `request` {http.IncomingMessage} + +Emitted when the handshake is complete. `request` is the http GET request sent +by the client. Useful for parsing authority headers, cookie headers, and other +information. + +### Event: 'error' + +- `error` {Error} + +Emitted when an error occurs on the underlying server. + +### Event: 'headers' + +- `headers` {Array} +- `request` {http.IncomingMessage} + +Emitted before the response headers are written to the socket as part of the +handshake. This allows you to inspect/modify the headers before they are sent. + +### Event: 'listening' + +Emitted when the underlying server has been bound. + +### Event: 'wsClientError' + +- `error` {Error} +- `socket` {net.Socket|tls.Socket} +- `request` {http.IncomingMessage} + +Emitted when an error occurs before the WebSocket connection is established. +`socket` and `request` are respectively the socket and the HTTP request from +which the error originated. The listener of this event is responsible for +closing the socket. When the `'wsClientError'` event is emitted there is no +`http.ServerResponse` object, so any HTTP response, including the response +headers and body, must be written directly to the `socket`. If there is no +listener for this event, the socket is closed with a default 4xx response +containing a descriptive error message. + +### server.address() + +Returns an object with `port`, `family`, and `address` properties specifying the +bound address, the address family name, and port of the server as reported by +the operating system if listening on an IP socket. If the server is listening on +a pipe or UNIX domain socket, the name is returned as a string. + +### server.clients + +- {Set} + +A set that stores all connected clients. Please note that this property is only +added when the `clientTracking` is truthy. + +### server.close([callback]) + +Prevent the server from accepting new connections and close the HTTP server if +created internally. If an external HTTP server is used via the `server` or +`noServer` constructor options, it must be closed manually. Existing connections +are not closed automatically. The server emits a `'close'` event when all +connections are closed unless an external HTTP server is used and client +tracking is disabled. In this case the `'close'` event is emitted in the next +tick. The optional callback is called when the `'close'` event occurs and +receives an `Error` if the server is already closed. + +### server.handleUpgrade(request, socket, head, callback) + +- `request` {http.IncomingMessage} The client HTTP GET request. +- `socket` {net.Socket|tls.Socket} The network socket between the server and + client. +- `head` {Buffer} The first packet of the upgraded stream. +- `callback` {Function}. + +Handle a HTTP upgrade request. When the HTTP server is created internally or +when the HTTP server is passed via the `server` option, this method is called +automatically. When operating in "noServer" mode, this method must be called +manually. + +If the upgrade is successful, the `callback` is called with two arguments: + +- `websocket` {WebSocket} A `WebSocket` object. +- `request` {http.IncomingMessage} The client HTTP GET request. + +### server.shouldHandle(request) + +- `request` {http.IncomingMessage} The client HTTP GET request. + +See if a given request should be handled by this server. By default this method +validates the pathname of the request, matching it against the `path` option if +provided. The return value, `true` or `false`, determines whether or not to +accept the handshake. + +This method can be overridden when a custom handling logic is required. + +## Class: WebSocket + +This class represents a WebSocket. It extends the `EventEmitter`. + +### Ready state constants + +| Constant | Value | Description | +| ---------- | ----- | ------------------------------------------------ | +| CONNECTING | 0 | The connection is not yet open. | +| OPEN | 1 | The connection is open and ready to communicate. | +| CLOSING | 2 | The connection is in the process of closing. | +| CLOSED | 3 | The connection is closed. | + +### new WebSocket(address[, protocols][, options]) + +- `address` {String|url.URL} The URL to which to connect. +- `protocols` {String|Array} The list of subprotocols. +- `options` {Object} + - `followRedirects` {Boolean} Whether or not to follow redirects. Defaults to + `false`. + - `generateMask` {Function} The function used to generate the masking key. It + takes a `Buffer` that must be filled synchronously and is called before a + message is sent, for each message. By default the buffer is filled with + cryptographically strong random bytes. + - `handshakeTimeout` {Number} Timeout in milliseconds for the handshake + request. This is reset after every redirection. + - `maxPayload` {Number} The maximum allowed message size in bytes. Defaults to + 100 MiB (104857600 bytes). + - `maxRedirects` {Number} The maximum number of redirects allowed. Defaults + to 10. + - `origin` {String} Value of the `Origin` or `Sec-WebSocket-Origin` header + depending on the `protocolVersion`. + - `perMessageDeflate` {Boolean|Object} Enable/disable permessage-deflate. + - `protocolVersion` {Number} Value of the `Sec-WebSocket-Version` header. + - `skipUTF8Validation` {Boolean} Specifies whether or not to skip UTF-8 + validation for text and close messages. Defaults to `false`. Set to `true` + only if the server is trusted. + - Any other option allowed in [`http.request()`][] or [`https.request()`][]. + Options given do not have any effect if parsed from the URL given with the + `address` parameter. + +`perMessageDeflate` default value is `true`. When using an object, parameters +are the same of the server. The only difference is the direction of requests. +For example, `serverNoContextTakeover` can be used to ask the server to disable +context takeover. + +Create a new WebSocket instance. + +#### UNIX Domain Sockets + +`ws` supports making requests to UNIX domain sockets. To make one, use the +following URL scheme: + +``` +ws+unix:///absolute/path/to/uds_socket:/pathname?search_params +``` + +Note that `:` is the separator between the socket path and the URL path. If the +URL path is omitted + +``` +ws+unix:///absolute/path/to/uds_socket +``` + +it defaults to `/`. + +### Event: 'close' + +- `code` {Number} +- `reason` {Buffer} + +Emitted when the connection is closed. `code` is a numeric value indicating the +status code explaining why the connection has been closed. `reason` is a +`Buffer` containing a human-readable string explaining why the connection has +been closed. + +### Event: 'error' + +- `error` {Error} + +Emitted when an error occurs. Errors may have a `.code` property, matching one +of the string values defined below under [Error codes](#error-codes). + +### Event: 'message' + +- `data` {Buffer|ArrayBuffer|Buffer[]} +- `isBinary` {Boolean} + +Emitted when a message is received. `data` is the message content. `isBinary` +specifies whether the message is binary or not. + +### Event: 'open' + +Emitted when the connection is established. + +### Event: 'ping' + +- `data` {Buffer} + +Emitted when a ping is received from the server. + +### Event: 'pong' + +- `data` {Buffer} + +Emitted when a pong is received from the server. + +### Event: 'redirect' + +- `url` {String} +- `request` {http.ClientRequest} + +Emitted before a redirect is followed. `url` is the redirect URL. `request` is +the HTTP GET request with the headers queued. This event gives the ability to +inspect confidential headers and remove them on a per-redirect basis using the +[`request.getHeader()`][] and [`request.removeHeader()`][] API. The `request` +object should be used only for this purpose. When there is at least one listener +for this event, no header is removed by default, even if the redirect is to a +different domain. + +### Event: 'unexpected-response' + +- `request` {http.ClientRequest} +- `response` {http.IncomingMessage} + +Emitted when the server response is not the expected one, for example a 401 +response. This event gives the ability to read the response in order to extract +useful information. If the server sends an invalid response and there isn't a +listener for this event, an error is emitted. + +### Event: 'upgrade' + +- `response` {http.IncomingMessage} + +Emitted when response headers are received from the server as part of the +handshake. This allows you to read headers from the server, for example +'set-cookie' headers. + +### websocket.addEventListener(type, listener[, options]) + +- `type` {String} A string representing the event type to listen for. +- `listener` {Function} The listener to add. +- `options` {Object} + - `once` {Boolean} A `Boolean` indicating that the listener should be invoked + at most once after being added. If `true`, the listener would be + automatically removed when invoked. + +Register an event listener emulating the `EventTarget` interface. This method +does nothing if `type` is not one of `'close'`, `'error'`, `'message'`, or +`'open'`. + +### websocket.binaryType + +- {String} + +A string indicating the type of binary data being transmitted by the connection. +This should be one of "nodebuffer", "arraybuffer" or "fragments". Defaults to +"nodebuffer". Type "fragments" will emit the array of fragments as received from +the sender, without copyfull concatenation, which is useful for the performance +of binary protocols transferring large messages with multiple fragments. + +### websocket.bufferedAmount + +- {Number} + +The number of bytes of data that have been queued using calls to `send()` but +not yet transmitted to the network. This deviates from the HTML standard in the +following ways: + +1. If the data is immediately sent the value is `0`. +1. All framing bytes are included. + +### websocket.close([code[, reason]]) + +- `code` {Number} A numeric value indicating the status code explaining why the + connection is being closed. +- `reason` {String|Buffer} The reason why the connection is closing. + +Initiate a closing handshake. + +### websocket.isPaused + +- {Boolean} + +Indicates whether the websocket is paused. + +### websocket.extensions + +- {Object} + +An object containing the negotiated extensions. + +### websocket.onclose + +- {Function} + +An event listener to be called when connection is closed. The listener receives +a `CloseEvent` named "close". + +### websocket.onerror + +- {Function} + +An event listener to be called when an error occurs. The listener receives an +`ErrorEvent` named "error". + +### websocket.onmessage + +- {Function} + +An event listener to be called when a message is received from the server. The +listener receives a `MessageEvent` named "message". + +### websocket.onopen + +- {Function} + +An event listener to be called when the connection is established. The listener +receives an `OpenEvent` named "open". + +### websocket.pause() + +Pause the websocket causing it to stop emitting events. Some events can still be +emitted after this is called, until all buffered data is consumed. This method +is a noop if the ready state is `CONNECTING` or `CLOSED`. + +### websocket.ping([data[, mask]][, callback]) + +- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The + data to send in the ping frame. +- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to + `true` when `websocket` is not a server client. +- `callback` {Function} An optional callback which is invoked when the ping + frame is written out. If an error occurs, the callback is called with the + error as its first argument. + +Send a ping. This method throws an error if the ready state is `CONNECTING`. + +### websocket.pong([data[, mask]][, callback]) + +- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The + data to send in the pong frame. +- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to + `true` when `websocket` is not a server client. +- `callback` {Function} An optional callback which is invoked when the pong + frame is written out. If an error occurs, the callback is called with the + error as its first argument. + +Send a pong. This method throws an error if the ready state is `CONNECTING`. + +### websocket.protocol + +- {String} + +The subprotocol selected by the server. + +### websocket.resume() + +Make a paused socket resume emitting events. This method is a noop if the ready +state is `CONNECTING` or `CLOSED`. + +### websocket.readyState + +- {Number} + +The current state of the connection. This is one of the ready state constants. + +### websocket.removeEventListener(type, listener) + +- `type` {String} A string representing the event type to remove. +- `listener` {Function} The listener to remove. + +Removes an event listener emulating the `EventTarget` interface. This method +only removes listeners added with +[`websocket.addEventListener()`](#websocketaddeventlistenertype-listener-options). + +### websocket.send(data[, options][, callback]) + +- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The + data to send. +- `options` {Object} + - `binary` {Boolean} Specifies whether `data` should be sent as a binary or + not. Default is autodetected. + - `compress` {Boolean} Specifies whether `data` should be compressed or not. + Defaults to `true` when permessage-deflate is enabled. + - `fin` {Boolean} Specifies whether `data` is the last fragment of a message + or not. Defaults to `true`. + - `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults + to `true` when `websocket` is not a server client. +- `callback` {Function} An optional callback which is invoked when `data` is + written out. If an error occurs, the callback is called with the error as its + first argument. + +Send `data` through the connection. This method throws an error if the ready +state is `CONNECTING`. + +### websocket.terminate() + +Forcibly close the connection. Internally this calls [`socket.destroy()`][]. + +### websocket.url + +- {String} + +The URL of the WebSocket server. Server clients don't have this attribute. + +## createWebSocketStream(websocket[, options]) + +- `websocket` {WebSocket} A `WebSocket` object. +- `options` {Object} [Options][duplex-options] to pass to the `Duplex` + constructor. + +Returns a `Duplex` stream that allows to use the Node.js streams API on top of a +given `WebSocket`. + +## Environment variables + +### WS_NO_BUFFER_UTIL + +When set to a non empty value, prevents the optional `bufferutil` dependency +from being required. + +### WS_NO_UTF_8_VALIDATE + +When set to a non empty value, prevents the optional `utf-8-validate` dependency +from being required. + +## Error codes + +Errors emitted by the websocket may have a `.code` property, describing the +specific type of error that has occurred: + +### WS_ERR_EXPECTED_FIN + +A WebSocket frame was received with the FIN bit not set when it was expected. + +### WS_ERR_EXPECTED_MASK + +An unmasked WebSocket frame was received by a WebSocket server. + +### WS_ERR_INVALID_CLOSE_CODE + +A WebSocket close frame was received with an invalid close code. + +### WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH + +A control frame with an invalid payload length was received. + +### WS_ERR_INVALID_OPCODE + +A WebSocket frame was received with an invalid opcode. + +### WS_ERR_INVALID_UTF8 + +A text or close frame was received containing invalid UTF-8 data. + +### WS_ERR_UNEXPECTED_MASK + +A masked WebSocket frame was received by a WebSocket client. + +### WS_ERR_UNEXPECTED_RSV_1 + +A WebSocket frame was received with the RSV1 bit set unexpectedly. + +### WS_ERR_UNEXPECTED_RSV_2_3 + +A WebSocket frame was received with the RSV2 or RSV3 bit set unexpectedly. + +### WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH + +A data frame was received with a length longer than the max supported length +(2^53 - 1, due to JavaScript language limitations). + +### WS_ERR_UNSUPPORTED_MESSAGE_LENGTH + +A message was received with a length longer than the maximum supported length, +as configured by the `maxPayload` option. + +[concurrency-limit]: https://github.com/websockets/ws/issues/1202 +[duplex-options]: + https://nodejs.org/api/stream.html#stream_new_stream_duplex_options +[`http.request()`]: + https://nodejs.org/api/http.html#http_http_request_options_callback +[`https.request()`]: + https://nodejs.org/api/https.html#https_https_request_options_callback +[permessage-deflate]: + https://tools.ietf.org/html/draft-ietf-hybi-permessage-compression-19 +[`request.getheader()`]: https://nodejs.org/api/http.html#requestgetheadername +[`request.removeheader()`]: + https://nodejs.org/api/http.html#requestremoveheadername +[`socket.destroy()`]: https://nodejs.org/api/net.html#net_socket_destroy_error +[zlib-options]: https://nodejs.org/api/zlib.html#zlib_class_options |