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https://github.com/denoland/deno.git
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479 lines
13 KiB
JavaScript
479 lines
13 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const { URL } = window.__bootstrap.url;
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const webidl = window.__bootstrap.webidl;
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const { HTTP_TOKEN_CODE_POINT_RE } = window.__bootstrap.infra;
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webidl.converters["sequence<DOMString> or DOMString"] = (V, opts) => {
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// Union for (sequence<DOMString> or DOMString)
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if (webidl.type(V) === "Object" && V !== null) {
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if (V[Symbol.iterator] !== undefined) {
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return webidl.converters["sequence<DOMString>"](V, opts);
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}
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}
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return webidl.converters.DOMString(V, opts);
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};
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webidl.converters["WebSocketSend"] = (V, opts) => {
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// Union for (Blob or ArrayBufferView or ArrayBuffer or USVString)
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if (V instanceof Blob) {
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return webidl.converters["Blob"](V, opts);
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}
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if (typeof V === "object") {
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if (V instanceof ArrayBuffer || V instanceof SharedArrayBuffer) {
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return webidl.converters["ArrayBuffer"](V, opts);
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}
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if (ArrayBuffer.isView(V)) {
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return webidl.converters["ArrayBufferView"](V, opts);
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}
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}
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return webidl.converters["USVString"](V, opts);
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};
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const CONNECTING = 0;
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const OPEN = 1;
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const CLOSING = 2;
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const CLOSED = 3;
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/**
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* Tries to close the resource (and ignores BadResource errors).
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* @param {number} rid
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*/
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function tryClose(rid) {
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try {
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core.close(rid);
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} catch (err) {
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// Ignore error if the socket has already been closed.
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if (!(err instanceof Deno.errors.BadResource)) throw err;
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}
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}
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const handlerSymbol = Symbol("eventHandlers");
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function makeWrappedHandler(handler) {
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function wrappedHandler(...args) {
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if (typeof wrappedHandler.handler !== "function") {
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return;
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}
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return wrappedHandler.handler.call(this, ...args);
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}
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wrappedHandler.handler = handler;
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return wrappedHandler;
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}
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// TODO(lucacasonato) reuse when we can reuse code between web crates
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function defineEventHandler(emitter, name) {
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// HTML specification section 8.1.5.1
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Object.defineProperty(emitter, `on${name}`, {
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get() {
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return this[handlerSymbol]?.get(name)?.handler;
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},
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set(value) {
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if (!this[handlerSymbol]) {
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this[handlerSymbol] = new Map();
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}
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let handlerWrapper = this[handlerSymbol]?.get(name);
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if (handlerWrapper) {
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handlerWrapper.handler = value;
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} else {
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handlerWrapper = makeWrappedHandler(value);
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this.addEventListener(name, handlerWrapper);
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}
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this[handlerSymbol].set(name, handlerWrapper);
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},
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configurable: true,
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enumerable: true,
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});
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}
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const _readyState = Symbol("[[readyState]]");
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const _url = Symbol("[[url]]");
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const _rid = Symbol("[[rid]]");
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const _extensions = Symbol("[[extensions]]");
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const _protocol = Symbol("[[protocol]]");
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const _binaryType = Symbol("[[binaryType]]");
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const _bufferedAmount = Symbol("[[bufferedAmount]]");
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class WebSocket extends EventTarget {
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[_rid];
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[_readyState] = CONNECTING;
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get readyState() {
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webidl.assertBranded(this, WebSocket);
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return this[_readyState];
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}
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get CONNECTING() {
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webidl.assertBranded(this, WebSocket);
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return CONNECTING;
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}
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get OPEN() {
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webidl.assertBranded(this, WebSocket);
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return OPEN;
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}
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get CLOSING() {
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webidl.assertBranded(this, WebSocket);
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return CLOSING;
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}
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get CLOSED() {
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webidl.assertBranded(this, WebSocket);
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return CLOSED;
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}
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[_extensions] = "";
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get extensions() {
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webidl.assertBranded(this, WebSocket);
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return this[_extensions];
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}
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[_protocol] = "";
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get protocol() {
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webidl.assertBranded(this, WebSocket);
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return this[_protocol];
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}
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[_url] = "";
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get url() {
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webidl.assertBranded(this, WebSocket);
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return this[_url];
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}
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[_binaryType] = "blob";
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get binaryType() {
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webidl.assertBranded(this, WebSocket);
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return this[_binaryType];
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}
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set binaryType(value) {
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webidl.assertBranded(this, WebSocket);
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value = webidl.converters.DOMString(value, {
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prefix: "Failed to set 'binaryType' on 'WebSocket'",
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});
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if (value === "blob" || value === "arraybuffer") {
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this[_binaryType] = value;
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}
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}
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[_bufferedAmount] = 0;
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get bufferedAmount() {
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webidl.assertBranded(this, WebSocket);
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return this[_bufferedAmount];
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}
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constructor(url, protocols = []) {
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super();
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this[webidl.brand] = webidl.brand;
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const prefix = "Failed to construct 'WebSocket'";
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webidl.requiredArguments(arguments.length, 1, {
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prefix,
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});
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url = webidl.converters.USVString(url, {
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prefix,
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context: "Argument 1",
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});
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protocols = webidl.converters["sequence<DOMString> or DOMString"](
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protocols,
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{
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prefix,
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context: "Argument 2",
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},
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);
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let wsURL;
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try {
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wsURL = new URL(url);
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} catch (e) {
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throw new DOMException(e.message, "SyntaxError");
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}
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if (wsURL.protocol !== "ws:" && wsURL.protocol !== "wss:") {
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throw new DOMException(
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"Only ws & wss schemes are allowed in a WebSocket URL.",
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"SyntaxError",
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);
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}
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if (wsURL.hash !== "" || wsURL.href.endsWith("#")) {
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throw new DOMException(
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"Fragments are not allowed in a WebSocket URL.",
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"SyntaxError",
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);
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}
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this[_url] = wsURL.href;
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core.opSync("op_ws_check_permission", this[_url]);
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if (typeof protocols === "string") {
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protocols = [protocols];
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}
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if (
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protocols.length !== new Set(protocols.map((p) => p.toLowerCase())).size
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) {
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throw new DOMException(
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"Can't supply multiple times the same protocol.",
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"SyntaxError",
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);
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}
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if (
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protocols.some((protocol) => !HTTP_TOKEN_CODE_POINT_RE.test(protocol))
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) {
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throw new DOMException(
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"Invalid protocol value.",
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"SyntaxError",
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);
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}
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core.opAsync("op_ws_create", {
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url: wsURL.href,
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protocols: protocols.join(", "),
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}).then((create) => {
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this[_rid] = create.rid;
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this[_extensions] = create.extensions;
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this[_protocol] = create.protocol;
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if (this[_readyState] === CLOSING) {
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core.opAsync("op_ws_close", {
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rid: this[_rid],
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}).then(() => {
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this[_readyState] = CLOSED;
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const errEvent = new ErrorEvent("error");
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errEvent.target = this;
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this.dispatchEvent(errEvent);
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const event = new CloseEvent("close");
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this[_rid]);
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});
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} else {
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this[_readyState] = OPEN;
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const event = new Event("open");
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event.target = this;
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this.dispatchEvent(event);
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this.#eventLoop();
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}
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}).catch((err) => {
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this[_readyState] = CLOSED;
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const errorEv = new ErrorEvent(
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"error",
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{ error: err, message: err.toString() },
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);
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errorEv.target = this;
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this.dispatchEvent(errorEv);
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const closeEv = new CloseEvent("close");
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closeEv.target = this;
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this.dispatchEvent(closeEv);
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});
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}
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send(data) {
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webidl.assertBranded(this, WebSocket);
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const prefix = "Failed to execute 'send' on 'WebSocket'";
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webidl.requiredArguments(arguments.length, 1, {
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prefix,
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});
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data = webidl.converters.WebSocketSend(data, {
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prefix,
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context: "Argument 1",
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});
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if (this[_readyState] !== OPEN) {
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throw new DOMException("readyState not OPEN", "InvalidStateError");
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}
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const sendTypedArray = (ta) => {
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this[_bufferedAmount] += ta.byteLength;
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core.opAsync("op_ws_send", {
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rid: this[_rid],
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kind: "binary",
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}, ta).then(() => {
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this[_bufferedAmount] -= ta.byteLength;
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});
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};
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if (data instanceof Blob) {
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data.slice().arrayBuffer().then((ab) =>
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sendTypedArray(new DataView(ab))
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);
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} else if (ArrayBuffer.isView(data)) {
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sendTypedArray(data);
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} else if (data instanceof ArrayBuffer) {
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sendTypedArray(new DataView(data));
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} else {
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const string = String(data);
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const d = core.encode(string);
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this[_bufferedAmount] += d.byteLength;
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core.opAsync("op_ws_send", {
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rid: this[_rid],
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kind: "text",
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text: string,
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}).then(() => {
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this[_bufferedAmount] -= d.byteLength;
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});
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}
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}
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close(code = undefined, reason = undefined) {
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webidl.assertBranded(this, WebSocket);
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const prefix = "Failed to execute 'close' on 'WebSocket'";
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if (code !== undefined) {
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code = webidl.converters["unsigned short"](code, {
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prefix,
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clamp: true,
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context: "Argument 1",
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});
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}
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if (reason !== undefined) {
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reason = webidl.converters.USVString(reason, {
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prefix,
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context: "Argument 2",
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});
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}
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if (
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code !== undefined && !(code === 1000 || (3000 <= code && code < 5000))
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) {
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throw new DOMException(
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"The close code must be either 1000 or in the range of 3000 to 4999.",
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"InvalidAccessError",
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);
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}
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if (reason !== undefined && core.encode(reason).byteLength > 123) {
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throw new DOMException(
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"The close reason may not be longer than 123 bytes.",
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"SyntaxError",
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);
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}
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if (this[_readyState] === CONNECTING) {
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this[_readyState] = CLOSING;
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} else if (this[_readyState] === OPEN) {
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this[_readyState] = CLOSING;
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core.opAsync("op_ws_close", {
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rid: this[_rid],
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code,
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reason,
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}).then(() => {
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this[_readyState] = CLOSED;
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const event = new CloseEvent("close", {
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wasClean: true,
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code: code ?? 1005,
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reason,
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});
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this[_rid]);
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});
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}
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}
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async #eventLoop() {
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while (this[_readyState] === OPEN) {
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const { kind, value } = await core.opAsync(
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"op_ws_next_event",
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this[_rid],
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);
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switch (kind) {
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case "string": {
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const event = new MessageEvent("message", {
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data: value,
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origin: this[_url],
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});
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event.target = this;
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this.dispatchEvent(event);
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break;
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}
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case "binary": {
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let data;
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if (this.binaryType === "blob") {
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data = new Blob([value]);
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} else {
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data = value.buffer;
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}
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const event = new MessageEvent("message", {
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data,
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origin: this[_url],
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});
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event.target = this;
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this.dispatchEvent(event);
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break;
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}
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case "ping": {
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core.opAsync("op_ws_send", {
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rid: this[_rid],
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kind: "pong",
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});
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break;
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}
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case "close": {
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this[_readyState] = CLOSED;
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const event = new CloseEvent("close", {
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wasClean: true,
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code: value.code,
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reason: value.reason,
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});
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event.target = this;
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this.dispatchEvent(event);
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tryClose(this[_rid]);
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break;
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}
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case "error": {
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this[_readyState] = CLOSED;
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const errorEv = new ErrorEvent("error", {
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message: value,
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});
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errorEv.target = this;
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this.dispatchEvent(errorEv);
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const closeEv = new CloseEvent("close");
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closeEv.target = this;
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this.dispatchEvent(closeEv);
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tryClose(this[_rid]);
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break;
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}
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}
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}
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}
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}
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Object.defineProperties(WebSocket, {
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CONNECTING: {
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value: 0,
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},
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OPEN: {
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value: 1,
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},
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CLOSING: {
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value: 2,
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},
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CLOSED: {
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value: 3,
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},
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});
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defineEventHandler(WebSocket.prototype, "message");
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defineEventHandler(WebSocket.prototype, "error");
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defineEventHandler(WebSocket.prototype, "close");
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defineEventHandler(WebSocket.prototype, "open");
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webidl.configurePrototype(WebSocket);
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window.__bootstrap.webSocket = { WebSocket };
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})(this);
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