diff --git a/Readme.md b/Readme.md index 43709ac..42c6306 100644 --- a/Readme.md +++ b/Readme.md @@ -3,150 +3,553 @@ This document describes the Socket.IO protocol. For a reference JavaScript implementation, take a look at - [socket.io-parser](https://github.com/learnboost/socket.io-parser), - [socket.io-client](https://github.com/learnboost/socket.io-client) - and [socket.io](https://github.com/learnboost/socket.io). + [socket.io-parser](https://github.com/socketio/socket.io-parser), + [socket.io-client](https://github.com/socketio/socket.io-client) + and [socket.io](https://github.com/socketio/socket.io). + +## Table of Contents + +- [Protocol version](#protocol-version) +- [Packet format](#packet-format) + - [Packet types](#packet-types) + - [CONNECT](#0---connect) + - [DISCONNECT](#1---disconnect) + - [EVENT](#2---event) + - [ACK](#3---ack) + - [ERROR](#4---error) + - [BINARY_EVENT](#5---binary_event) + - [BINARY_ACK](#6---binary_ack) +- [Packet encoding](#packet-encoding) + - [Encoding format](#encoding-format) + - [Examples](#examples) +- [Exchange protocol](#exchange-protocol) + - [Connection to the default namespace](#connection-to-the-default-namespace) + - [Connection to a non-default namespace](#connection-to-a-non-default-namespace) + - [Disconnection from a non-default namespace](#disconnection-from-a-non-default-namespace) + - [Acknowledgement](#acknowledgement) +- [Sample session](#sample-session) +- [History](#history) + - [Difference between v4 and v3](#difference-between-v4-and-v3) + - [Difference between v3 and v2](#difference-between-v3-and-v2) + - [Difference between v2 and v1](#difference-between-v2-and-v1) + - [Initial revision](#initial-revision) ## Protocol version - **Current protocol revision:** `3`. +This is the revision **4** of the Socket.IO protocol, included in `socket.io@1.0.3...latest`. -## Parser API +The 3rd revision (included in `socket.io@1.0.0...1.0.2`) can be found here: https://github.com/socketio/socket.io-protocol/tree/v3 -### Parser#Encoder +Both the 1st and the 2nd revisions were part of the work towards Socket.IO 1.0 but were never included in a Socket.IO +release. - An object that encodes socket.io packets to engine.io-transportable form. - Its only public method is Encoder#encode. +It is built on top of the [3rd](https://github.com/socketio/engine.io-protocol/tree/v3) revision of the Engine.IO +protocol. -#### Encoder#encode(Object:packet, Function:callback) +While the Engine.IO protocol describes the low-level plumbing with WebSocket and HTTP long-polling, the Socket.IO +protocol adds another layer above in order to provide the following features: - Encodes a `Packet` object into an array of engine.io-compatible encodings. - If the object is pure JSON the array will contain a single item, a socket.io - encoded string. If the object contains binary data (ArrayBuffer, Buffer, - Blob, or File) the array's first item will be a string with packet-relevant - metadata and JSON with placeholders where the binary data was held in the - initial packet. The remaining items will be the raw binary data to fill in - the placeholders post-decoding. +- multiplexing (what we call [Namespace](https://socket.io/docs/namespaces/)) - The callback function is called with the encoded array as its only argument. - In the socket.io-parser implementation, the callback writes each item in the - array to engine.io for transport. The expectation for any implementation is - that each item in the array is transported sequentially. +Example of the Javascript API: -### Parser#Decoder +```js +// server-side +const nsp = io.of("/admin"); +nsp.on("connect", socket => {}); - An object that decodes data from engine.io into complete socket.io packets. +// client-side +const socket1 = io(); // default namespace +const socket2 = io("/admin"); +socket2.on("connect", () => {}); +``` - The expected workflow for using the Decoder is to call the `Decoder#add` - method upon receiving any encoding from engine.io (in the sequential order in - which the encodings are received) and to listen to the Decoder's 'decoded' - events to handle fully decoded packets. +- acknowledgement of packets -#### Decoder#add(Object:encoding) +Example of the Javascript API: - Decodes a single encoded object from engine.io transport. In the case of a - non-binary packet, the one encoding argument is used to reconstruct the full - packet. If the packet is of type `BINARY_EVENT` or `ACK`, then additional calls - to add are expected, one for each piece of binary data in the original packet. - Once the final binary data encoding is passed to add, the full socket.io - packet is reconstructed. +```js +// on one side +socket.emit("hello", 1, () => { console.log("received"); }); +// on the other side +socket.on("hello", (a, cb) => { cb(); }); +``` - After a packet is fully decoded, the Decoder emits a 'decoded' event (via - Emitter) with the decoded packet as the sole argument. Listeners to this event - should treat the packet as ready-to-go. +## Packet format -#### Decoder#destroy() +A packet contains the following fields: - Deallocates the Decoder instance's resources. Should be called in the event - of a disconnect mid-decoding, etc. to prevent memory leaks. +- a type (integer, see [below](#packet-types)) +- a namespace (string) +- optionally, a payload (string | Array) +- optionally, an acknowledgment id (integer) -### Parser#types +## Packet types - Array of packet type keys. +### 0 - CONNECT -### Packet +This event is sent: - Each packet is represented as a vanilla `Object` with a `nsp` key that - indicates what namespace it belongs to (see "Multiplexing") and a - `type` key that can be one of the following: +- by the client when requesting access to a namespace +- by the server when accepting the connection to a namespace - - `Packet#CONNECT` (`0`) - - `Packet#DISCONNECT` (`1`) - - `Packet#EVENT` (`2`) - - `Packet#ACK` (`3`) - - `Packet#ERROR` (`4`) - - `Packet#BINARY_EVENT` (`5`) +It does not contain any payload nor acknowledgement id. -#### EVENT +Example: - - `data` (`Array`) a list of arguments, the first of which is the event - name. Arguments can contain any type of field that can result of - `JSON` decoding, including objects and arrays of arbitrary size. +```json +{ + "type": 0, + "nsp": "/admin" +} +``` - - `id` (`Number`) if the `id` identifier is present, it indicates that the - server wishes to be acknowledged of the reception of this event. +The client may include additional information (i.e. for authentication purpose) in the namespace field. Example: -#### BINARY_EVENT +```json +{ + "type": 0, + "nsp": "/admin?token=1234&uid=abcd" +} +``` - - `data` (`Array`) see `EVENT` `data`, but with addition that any of the arguments - may contain non-JSON arbitrary binary data. For encoding, binary data is - considered either a Buffer, ArrayBuffer, Blob, or File. When decoding, all - binary data server-side is a Buffer; on modern clients binary data is an - ArrayBuffer. On older browsers that don't support binary, every binary data - item is replaced with an object like so: -`{base64: true, data: }`. When a `BINARY_EVENT` or `ACK` - packet is initially decoded, all of the binary data items will be placeholders, - and will be filled by additional calls to `Decoder#add`. +#### 1 - DISCONNECT - - `id` (`Number`) see `EVENT` `id`. +This event is used when one side wants to disconnect from a namespace. -#### ACK +It does not contain any payload nor acknowledgement id. - - `data` (`Array`) see `EVENT` `data`. Encoded in the `BINARY_EVENT` style in - case acknowledgement functions need binary data; see the notes above. - - `id` (`Number`) see `EVENT` `id`. +Example: -#### ERROR +```json +{ + "type": 1, + "nsp": "/admin" +} +``` - - `data` (`Mixed`) error data +#### 2 - EVENT -## Transport +This event is used when one side wants to transmit some data (without binary) to the other side. - The socket.io protocol can be delivered over a variety of transports. - [socket.io-client](http://github.com/learnboost/socket.io-client) - is the implementation of the protocol for the browser and Node.JS over - [engine.io-client](http://github.com/learnboost/engine.io-client). +It does contain a payload, and an optional acknowledgement id. - [socket.io](http://github.com/learnboost/socket.io) is the server - implementation of the protocol over - [engine.io](http://github.com/learnboost/engine.io). +Example: -## Multiplexing +```json +{ + "type": 2, + "nsp": "/", + "data": ["hello", 1] +} +``` - Socket.IO has built-in multiplexing support, which means that each packet - always belongs to a given `namespace`, identified by a path string (like - `/this`). The corresponding key in the `Packet` object is `nsp`. +With an acknowledgment id: - When the socket.io transport connection is established, a connection - attempt to the `/` namespace is assumed (ie: the server behaves as if - the client had sent a `CONNECT` packet to the `/` namespace). +```json +{ + "type": 2, + "nsp": "/admin", + "data": ["project:delete", 123], + "id": 456 +} +``` - In order to support multiplexing of multiple sockets under - the same transport, additional `CONNECT` packets can be sent by the - client to arbitrary namespace URIs (eg: `/another`). +#### 3 - ACK - When the server responds with a `CONNECT` packet to the corresponding - namespace, the multiplexed socket is considered connected. +This event is used when one side has received an EVENT or a BINARY_EVENT with an acknowledgement id. - Alternatively, the server can respond with an `ERROR` packet to indicate - a multiplexed socket connection error, such as authentication errors. - The associated error payload varies according to each error, and can - be user-defined. +It contains the acknowledgement id received in the previous packet, and may contain a payload (without binary). - After a `CONNECT` packet is received by the server for a given `nsp`, - the client can then send and receive `EVENT` packets. If any of the - parties receives an `EVENT` packet with an `id` field, an `ACK` packet is - expected to confirm the reception of said packet. +```json +{ + "type": 3, + "nsp": "/admin", + "data": [], + "id": 456 +} +``` + +#### 4 - ERROR + +This event is sent by the server when the connection to a namespace is refused. + +It may contain a payload indicating the reason of the refusal. + +Example: + +```json +{ + "type": 4, + "nsp": "/admin", + "data": "Not authorized" +} +``` + +#### 5 - BINARY_EVENT + +This event is used when one side wants to transmit some data (including binary) to the other side. + +It does contain a payload, and an optional acknowledgement id. + +Example: + +``` +{ + "type": 5, + "nsp": "/", + "data": ["hello", ] +} +``` + +With an acknowledgment id: + +``` +{ + "type": 5, + "nsp": "/admin", + "data": ["project:delete", ], + "id": 456 +} +``` + +#### 6 - BINARY_ACK + +This event is used when one side has received an EVENT or a BINARY_EVENT with an acknowledgement id. + +It contains the acknowledgement id received in the previous packet, and contain a payload including binary. + +Example: + +``` +{ + "type": 6, + "nsp": "/admin", + "data": [], + "id": 456 +} +``` + +## Packet encoding + +This section details the encoding used by the default parser which is included in Socket.IO server and client, and +whose source can be found [here](https://github.com/socketio/socket.io-parser). + +The JS server and client implementations also supports custom parsers, which have different tradeoffs and may benefit to +certain kind of applications. Please see [socket.io-json-parser](https://github.com/darrachequesne/socket.io-json-parser) +or [socket.io-msgpack-parser](https://github.com/darrachequesne/socket.io-msgpack-parser) for example. + +Please also note that each Socket.IO packet is sent as a Engine.IO `message` packet (more information [here](https://github.com/socketio/engine.io-protocol)), +so the encoded result will be prefixed by `4` when sent over the wire (in the request/response body with HTTP +long-polling, or in the WebSocket frame). + +### Encoding format + +``` +[<# of binary attachments>-][,][][JSON-stringified payload without binary] + ++ binary attachments extracted +``` + +Note: + +- the namespace is only included if it is different from the default namespace (`/`) + +### Examples + +- `CONNECT` packet for the default namespace + +```json +{ + "type": 0, + "nsp": "/" +} +``` + +is encoded to `0` + +- `CONNECT` packet for the `/admin` namespace + +```json +{ + "type": 0, + "nsp": "/admin" +} +``` + +is encoded to `0/admin,` + +- `DISCONNECT` packet for the `/admin` namespace + +```json +{ + "type": 1, + "nsp": "/admin" +} +``` + +is encoded to `1/admin,` + +- `EVENT` packet + +```json +{ + "type": 2, + "nsp": "/", + "data": ["hello", 1] +} +``` + +is encoded to `2["hello",1]` + +- `EVENT` packet with an acknowledgement id + +```json +{ + "type": 2, + "nsp": "/admin", + "data": ["project:delete", 123], + "id": 456 +} +``` + +is encoded to `2/admin,456["project:delete",123]` + +- `ACK` packet + +```json +{ + "type": 3, + "nsp": "/admin", + "data": [], + "id": 456 +} +``` + +is encoded to `3/admin,456[]` + +- `ERROR` packet + +```json +{ + "type": 4, + "nsp": "/admin", + "data": "Not authorized" +} +``` + +is encoded to `4/admin,"Not authorized"` + +- `BINARY_EVENT` packet + +``` +{ + "type": 5, + "nsp": "/", + "data": ["hello", ] +} +``` + +is encoded to `51-["hello",{"_placeholder":true,"num":0}]` + `` + +- `BINARY_EVENT` packet with an acknowledgement id + +``` +{ + "type": 5, + "nsp": "/admin", + "data": ["project:delete", ], + "id": 456 +} +``` + +is encoded to `51-/admin,456["project:delete",{"_placeholder":true,"num":0}]` + `` + +- `BINARY_ACK` packet + +``` +{ + "type": 6, + "nsp": "/admin", + "data": [], + "id": 456 +} +``` + +is encoded to `61-/admin,456[{"_placeholder":true,"num":0}]` + `` + + +## Exchange protocol + +### Connection to the default namespace + +The server always send a `CONNECT` packet for the default namespace (`/`) when the connection is established. + +That is, even if the client requests access to a non-default namespace, it will receive a `CONNECT` packet for the +default namespace first. + +``` +Server > { type: CONNECT, nsp: "/" } +``` + +No response is expected from the client. + +### Connection to a non-default namespace + +``` +Client > { type: CONNECT, nsp: "/admin" } +Server > { type: CONNECT, nsp: "/admin" } (if the connection is successful) +or +Server > { type: ERROR, nsp: "/admin", data: "Not authorized" } +``` + +### Disconnection from a non-default namespace + +``` +Client > { type: DISCONNECT, nsp: "/admin" } +``` + +And vice versa. No response is expected from the other-side. + +### Acknowledgement + +``` +Client > { type: EVENT, nsp: "/admin", data: ["hello"], id: 456 } +Server > { type: ACK, nsp: "/admin", data: [], id: 456 } +or +Server > { type: BINARY_ACK, nsp: "/admin", data: [ ], id: 456 } +``` + +And vice versa. + +## Sample session + +Here is an example of what is sent over the wire when combining both the Engine.IO and the Socket.IO protocols. + +- Request n°1 (open packet) + +``` +GET /socket.io/?EIO=3&transport=polling&t=N8hyd6w +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +96:0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000}2:40 +``` + +Details: + +``` +96 => number of characters (not bytes) of the first message +: => separator +0 => Engine.IO "open" packet type +{"sid":... => the Engine.IO handshake data +2 => number of characters of the 2nd message +: => separator +4 => Engine.IO "message" packet type +0 => Socket.IO "CONNECT" packet type +``` + +Note: the `t` query param is used to ensure that the request is not cached by the browser. + +- Request n°2 (message in): + +`socket.emit('hey', 'Jude')` is executed on the server: + +``` +GET /socket.io/?EIO=3&transport=polling&t=N8hyd7H&sid=lv_VI97HAXpY6yYWAAAC +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +16:42["hey","Jude"] +``` + +Details: + +``` +16 => number of characters +: => separator +4 => Engine.IO "message" packet type +2 => Socket.IO "EVENT" packet type +[...] => content +``` + +- Request n°3 (message out) + +`socket.emit('hello'); socket.emit('world');` is executed on the client: + +``` +POST /socket.io/?EIO=3&transport=polling&t=N8hzxke&sid=lv_VI97HAXpY6yYWAAAC +> Content-Type: text/plain; charset=UTF-8 +11:42["hello"]11:42["world"] +< HTTP/1.1 200 OK +< Content-Type: text/plain; charset=UTF-8 +ok +``` + +Details: + +``` +11 => number of characters of the 1st packet +: => separator +4 => Engine.IO "message" packet type +2 => Socket.IO "EVENT" packet type +["hello"] => the 1st content +11 => number of characters of the 2nd packet +: => separator +4 => Engine.IO "message" packet type +2 => Socket.IO "EVENT" packet type +["world"] => the 2nd content +``` + +- Request n°4 (WebSocket upgrade) + +``` +GET /socket.io/?EIO=3&transport=websocket&sid=lv_VI97HAXpY6yYWAAAC +< HTTP/1.1 101 Switching Protocols +``` + +WebSocket frames: + +``` +< 2probe => Engine.IO probe request +> 3probe => Engine.IO probe response +> 5 => Engine.IO "upgrade" packet type +> 42["hello"] +> 42["world"] +> 40/admin, => request access to the admin namespace (Socket.IO "CONNECT" packet) +< 40/admin, => grant access to the admin namespace +> 42/admin,1["tellme"] => Socket.IO "EVENT" packet with acknowledgement +< 461-/admin,1[{"_placeholder":true,"num":0}] => Socket.IO "BINARY_ACK" packet with a placeholder +< => the binary attachment (sent in the following frame) +... after a while without message +> 2 => Engine.IO "ping" packet type +< 3 => Engine.IO "pong" packet type +> 1 => Engine.IO "close" packet type +``` + +## History + +### Difference between v4 and v3 + +- add a `BINARY_ACK` packet type + +Previously, an `ACK` packet was always treated as if it may contain binary objects, with recursive search for such +objects, which could hurt performance. + +### Difference between v3 and v2 + +- remove the usage of msgpack to encode packets containing binary objects (see also [299849b](https://github.com/socketio/socket.io-parser/commit/299849b00294c3bc95817572441f3aca8ffb1f65)) + +### Difference between v2 and v1 + +- add a `BINARY_EVENT` packet type + +This was added during the work towards Socket.IO 1.0, in order to add support for binary objects. The `BINARY_EVENT` +packets were encoded with [msgpack](https://msgpack.org/). + +### Initial revision + +This first revision was the result of the split between the Engine.IO protocol (low-level plumbing with WebSocket / HTTP +long-polling, heartbeat) and the Socket.IO protocol. It was never included in a Socket.IO release, but paved the way for +the next iterations. ## License diff --git a/test-suite/.gitignore b/test-suite/.gitignore new file mode 100755 index 0000000..3c3629e --- /dev/null +++ b/test-suite/.gitignore @@ -0,0 +1 @@ +node_modules diff --git a/test-suite/index.html b/test-suite/index.html new file mode 100644 index 0000000..49fdb6b --- /dev/null +++ b/test-suite/index.html @@ -0,0 +1,30 @@ + + + + + + + Test suite for the Socket.IO protocol + + + + +
+ + + + + + + + + + + + + diff --git a/test-suite/node-imports.js b/test-suite/node-imports.js new file mode 100644 index 0000000..08b4355 --- /dev/null +++ b/test-suite/node-imports.js @@ -0,0 +1,30 @@ +import fetch from "node-fetch"; +import { WebSocket, createWebSocketStream } from "ws"; +import chai from "chai"; +import chaiString from "chai-string"; + + +// Wrap WebSocket to provide a async iterator to yield messages +// This is a workaround for the lack of support for async iterators in ws +// It avoids the need to spawn a new event handler + promise for each message +class WebSocketStream extends WebSocket { + constructor(url) { + super(url); + this.stream = createWebSocketStream(this, { objectMode: true, readableObjectMode: true }); + // ignore errors + this.stream.on("error", () => { }); + } + + // implement async iterator + async* iterator() { + for await (const message of this.stream.iterator()) { + yield message; + } + } +} + +chai.use(chaiString); + +globalThis.fetch = 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true + } + } +} diff --git a/test-suite/package.json b/test-suite/package.json new file mode 100644 index 0000000..6b0391b --- /dev/null +++ b/test-suite/package.json @@ -0,0 +1,18 @@ +{ + "name": "socket.io-protocol-test-suite", + "version": "0.0.1", + "private": true, + "type": "module", + "scripts": { + "format": "prettier -w *.js", + "test": "mocha test-suite.js" + }, + "devDependencies": { + "chai": "^4.3.6", + "chai-string": "^1.5.0", + "mocha": "^9.2.1", + "node-fetch": "^3.2.0", + "prettier": "^2.5.1", + "ws": "^8.5.0" + } +} diff --git a/test-suite/test-suite.js b/test-suite/test-suite.js new file mode 100644 index 0000000..76902cf --- /dev/null +++ b/test-suite/test-suite.js @@ -0,0 +1,593 @@ +const isNodejs = typeof window === "undefined"; + +if (isNodejs) { + // make the tests runnable in both the browser and Node.js + await import("./node-imports.js"); +} + +const { expect } = chai; + +const URL = "http://localhost:3000"; +const WS_URL = URL.replace("http", "ws"); + +const PING_INTERVAL = 300; +const PING_TIMEOUT = 200; + +function sleep(delay) { + return new Promise((resolve) => setTimeout(resolve, delay)); +} + +async function waitFor(socket, eventType) { + if (eventType == "message" && isNodejs) { + const { value: data } = await socket.iterator().next(); + return { data }; + } + + return new Promise((resolve) => { + socket.addEventListener( + eventType, + (event) => { + resolve(event); + }, + { once: true } + ); + }); +} + +async function waitForPackets(socket, count) { + const packets = []; + if (isNodejs) { + for await (const packet of socket.iterator()) { + packets.push(packet); + if (packets.length === count) { + return packets; + } + } + } + + return new Promise((resolve) => { + const handler = (event) => { + if (event.data === "2") { + // ignore PING packets + return; + } + packets.push(event.data); + if (packets.length === count) { + socket.removeEventListener("message", handler); + resolve(packets); + } + }; + socket.addEventListener("message", handler); + }); +} + +function decodePayload(payload) { + const firstColonIndex = payload.indexOf(":"); + const length = payload.substring(0, firstColonIndex); + const packet = payload.substring(firstColonIndex + 1); + return [length, packet]; +} + +async function initLongPollingSession() { + const response = await fetch(`${URL}/socket.io/?EIO=3&transport=polling`); + const text = await response.text(); + const [, content] = decodePayload(text); + return JSON.parse(content.substring(1)).sid; +} + +async function initSocketIOConnection() { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + socket.binaryType = "arraybuffer"; + + await waitFor(socket, "message"); // Socket.IO handshake + await waitFor(socket, "message"); // Socket.IO / namespace handshake + await waitFor(socket, "message"); // auth packet + + return socket; +} + +describe("Engine.IO protocol", () => { + describe("handshake", () => { + describe("HTTP long-polling", () => { + it("should successfully open a session", async () => { + const response = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling` + ); + + expect(response.status).to.eql(200); + + const text = await response.text(); + const [length, content] = decodePayload(text); + + expect(length).to.eql(content.length.toString()); + expect(content).to.startsWith("0"); + + const value = JSON.parse(content.substring(1)); + + expect(value).to.have.all.keys( + "sid", + "upgrades", + "pingInterval", + "pingTimeout", + "maxPayload" + ); + expect(value.sid).to.be.a("string"); + expect(value.upgrades).to.eql(["websocket"]); + expect(value.pingInterval).to.eql(PING_INTERVAL); + expect(value.pingTimeout).to.eql(PING_TIMEOUT); + expect(value.maxPayload).to.eql(1000000); + }); + + it("should fail with an invalid 'EIO' query parameter", async () => { + const response = await fetch(`${URL}/socket.io/?transport=polling`); + + expect(response.status).to.eql(400); + + const response2 = await fetch( + `${URL}/socket.io/?EIO=abc&transport=polling` + ); + + expect(response2.status).to.eql(400); + }); + + it("should fail with an invalid 'transport' query parameter", async () => { + const response = await fetch(`${URL}/socket.io/?EIO=3`); + + expect(response.status).to.eql(400); + + const response2 = await fetch(`${URL}/socket.io/?EIO=3&transport=abc`); + + expect(response2.status).to.eql(400); + }); + + it("should fail with an invalid request method", async () => { + const response = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling`, + { + method: "post", + } + ); + + expect(response.status).to.eql(400); + + const response2 = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling`, + { + method: "put", + } + ); + + expect(response2.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("should successfully open a session", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.startsWith("0"); + + const value = JSON.parse(data.substring(1)); + + expect(value).to.have.all.keys( + "sid", + "upgrades", + "pingInterval", + "pingTimeout", + "maxPayload" + ); + expect(value.sid).to.be.a("string"); + expect(value.upgrades).to.eql([]); + expect(value.pingInterval).to.eql(PING_INTERVAL); + expect(value.pingTimeout).to.eql(PING_TIMEOUT); + expect(value.maxPayload).to.eql(1000000); + + socket.close(); + }); + + it("should fail with an invalid 'EIO' query parameter", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?transport=websocket` + ); + + if (isNodejs) { + socket.on("error", () => { }); + } + + waitFor(socket, "close"); + + const socket2 = new WebSocket( + `${WS_URL}/socket.io/?EIO=abc&transport=websocket` + ); + + if (isNodejs) { + socket2.on("error", () => { }); + } + + waitFor(socket2, "close"); + }); + + it("should fail with an invalid 'transport' query parameter", async () => { + const socket = new WebSocket(`${WS_URL}/socket.io/?EIO=3`); + + if (isNodejs) { + socket.on("error", () => { }); + } + + waitFor(socket, "close"); + + const socket2 = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=abc` + ); + + if (isNodejs) { + socket2.on("error", () => { }); + } + + waitFor(socket2, "close"); + }); + }); + }); + + describe("heartbeat", function () { + this.timeout(5000); + + describe("HTTP long-polling", () => { + it("should send ping/pong packets", async () => { + const sid = await initLongPollingSession(); + + for (let i = 0; i < 3; i++) { + const pushResponse = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}`, + { + method: "post", + body: "1:2", + } + ); + + expect(pushResponse.status).to.eql(200); + + const pollResponse = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(200); + + const pollContent = await pollResponse.text(); + + if (i === 0) { + expect(pollContent).to.eql(`2:4013:42["auth",{}]1:3`); + } else { + expect(pollContent).to.eql("1:3"); + } + } + }); + + it("should close the session upon ping timeout", async () => { + const sid = await initLongPollingSession(); + + await sleep(PING_INTERVAL + PING_TIMEOUT); + + const pollResponse = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("should send ping/pong packets", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // handshake + await waitFor(socket, "message"); // connect + await waitFor(socket, "message"); // ns auth echo + + for (let i = 0; i < 3; i++) { + socket.send("2"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql("3"); + } + + socket.close(); + }); + + it("should close the session upon ping timeout", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "close"); // handshake + }); + }); + }); + + describe("close", () => { + describe("HTTP long-polling", () => { + it("should forcefully close the session", async () => { + const sid = await initLongPollingSession(); + + const [pollResponse] = await Promise.all([ + fetch(`${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}`), + fetch(`${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}`, { + method: "post", + body: "1:1", + }), + ]); + + expect(pollResponse.status).to.eql(200); + + const pullContent = await pollResponse.text(); + + expect(pullContent).to.eql(`2:4013:42["auth",{}]`); + + const pollResponse2 = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse2.status).to.eql(400); + }); + }); + + describe("WebSocket", () => { + it("should forcefully close the session", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // handshake + + socket.send("1"); + + await waitFor(socket, "close"); + }); + }); + }); + + describe("upgrade", () => { + it("should successfully upgrade from HTTP long-polling to WebSocket", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + + // send probe + socket.send("2probe"); + + const probeResponse = await waitFor(socket, "message"); + + expect(probeResponse.data).to.eql("3probe"); + + // complete upgrade + socket.send("5"); + }); + + it("should ignore HTTP requests with same sid after upgrade", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + socket.send("2probe"); + socket.send("5"); + + const pollResponse = await fetch( + `${URL}/socket.io/?EIO=3&transport=polling&sid=${sid}` + ); + + expect(pollResponse.status).to.eql(400); + }); + + it("should ignore WebSocket connection with same sid after upgrade", async () => { + const sid = await initLongPollingSession(); + + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket, "open"); + socket.send("2probe"); + socket.send("5"); + + const socket2 = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket&sid=${sid}` + ); + + await waitFor(socket2, "close"); + }); + }); +}); + +describe("Socket.IO protocol", () => { + describe("connect", () => { + it("should be connected by default to the main namespace", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // Engine.IO handshake + + await waitFor(socket, "message"); // Socket.IO / namespace handshake + await waitFor(socket, "message"); // auth packet + + socket.send('42["message","message to main namespace"]'); + const { data } = await waitFor(socket, "message"); + expect(data).to.eql('42["message-back","message to main namespace"]'); + }); + + it("should allow connection to a custom namespace", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // Engine.IO handshake + await waitFor(socket, "message"); // Socket.IO / namespace handshake + await waitFor(socket, "message"); // auth packet + + socket.send("40/custom,"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.startsWith("40/custom"); + }); + + + it("should disallow connection to an unknown namespace", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // Engine.IO handshake + await waitFor(socket, "message"); // Socket.IO / namespace handshake + await waitFor(socket, "message"); // auth packet + + socket.send("40/random"); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql('44/random,{"message":"Invalid namespace"}'); + }); + + it("should disallow connection with an invalid handshake", async () => { + const socket = new WebSocket( + `${WS_URL}/socket.io/?EIO=3&transport=websocket` + ); + + await waitFor(socket, "message"); // Engine.IO handshake + await waitFor(socket, "message"); // Socket.IO / namespace handshake + await waitFor(socket, "message"); // auth packet + + socket.send("4abc"); + + await waitFor(socket, "close"); + }); + }); + + describe("disconnect", () => { + it("should disconnect from the main namespace", async () => { + const socket = await initSocketIOConnection(); + + socket.send("41"); + + await waitFor(socket, "close"); + }); + + it("should connect then disconnect from a custom namespace", async () => { + const socket = await initSocketIOConnection(); + + socket.send("40/custom"); + + await waitFor(socket, "message"); // Socket.IO handshake + await waitFor(socket, "message"); // auth packet + + socket.send("41/custom"); + socket.send('42["message","message to main namespace"]'); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql('42["message-back","message to main namespace"]'); + }); + }); + + describe("message", () => { + it("should send a plain-text packet", async () => { + const socket = await initSocketIOConnection(); + + socket.send('42["message",1,"2",{"3":[true]}]'); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql('42["message-back",1,"2",{"3":[true]}]'); + }); + + it("should send a packet with binary attachments", async () => { + const socket = await initSocketIOConnection(); + + socket.send( + '452-["message",{"_placeholder":true,"num":0},{"_placeholder":true,"num":1}]' + ); + socket.send(Uint8Array.from([4, 1, 2, 3])); + socket.send(Uint8Array.from([4, 4, 5, 6])); + + const packets = await waitForPackets(socket, 3); + + expect(packets[0]).to.eql( + '452-["message-back",{"_placeholder":true,"num":0},{"_placeholder":true,"num":1}]' + ); + expect(packets[1]).to.eql(Uint8Array.from([4, 1, 2, 3]).buffer); + expect(packets[2]).to.eql(Uint8Array.from([4, 4, 5, 6]).buffer); + + socket.close(); + }); + + it("should send a plain-text packet with an ack", async () => { + const socket = await initSocketIOConnection(); + + socket.send('42456["message-with-ack",1,"2",{"3":[false]}]'); + + const { data } = await waitFor(socket, "message"); + + expect(data).to.eql('43456[1,"2",{"3":[false]}]'); + }); + + it("should send a packet with binary attachments and an ack", async () => { + const socket = await initSocketIOConnection(); + + socket.send( + '452-789["message-with-ack",{"_placeholder":true,"num":0},{"_placeholder":true,"num":1}]' + ); + socket.send(Uint8Array.from([4, 1, 2, 3])); + socket.send(Uint8Array.from([4, 4, 5, 6])); + + const packets = await waitForPackets(socket, 3); + + expect(packets[0]).to.eql( + '462-789[{"_placeholder":true,"num":0},{"_placeholder":true,"num":1}]' + ); + expect(packets[1]).to.eql(Uint8Array.from([4, 1, 2, 3]).buffer); + expect(packets[2]).to.eql(Uint8Array.from([4, 4, 5, 6]).buffer); + + socket.close(); + }); + + it("should close the connection upon invalid format (unknown packet type)", async () => { + const socket = await initSocketIOConnection(); + + socket.send("4abc"); + + await waitFor(socket, "close"); + }); + + it("should close the connection upon invalid format (invalid payload format)", async () => { + const socket = await initSocketIOConnection(); + + socket.send("42{}"); + + await waitFor(socket, "close"); + }); + + it("should close the connection upon invalid format (invalid ack id)", async () => { + const socket = await initSocketIOConnection(); + + socket.send('42abc["message-with-ack",1,"2",{"3":[false]}]'); + + await waitFor(socket, "close"); + }); + }); +});