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+'use strict'
+
+const { kReadyState, kController, kResponse, kBinaryType, kWebSocketURL } = require('./symbols')
+const { states, opcodes } = require('./constants')
+const { ErrorEvent, createFastMessageEvent } = require('./events')
+const { isUtf8 } = require('node:buffer')
+const { collectASequenceOfCodePointsFast, removeHTTPWhitespace } = require('../fetch/data-url')
+
+/* globals Blob */
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @returns {boolean}
+ */
+function isConnecting (ws) {
+ // If the WebSocket connection is not yet established, and the connection
+ // is not yet closed, then the WebSocket connection is in the CONNECTING state.
+ return ws[kReadyState] === states.CONNECTING
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @returns {boolean}
+ */
+function isEstablished (ws) {
+ // If the server's response is validated as provided for above, it is
+ // said that _The WebSocket Connection is Established_ and that the
+ // WebSocket Connection is in the OPEN state.
+ return ws[kReadyState] === states.OPEN
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @returns {boolean}
+ */
+function isClosing (ws) {
+ // Upon either sending or receiving a Close control frame, it is said
+ // that _The WebSocket Closing Handshake is Started_ and that the
+ // WebSocket connection is in the CLOSING state.
+ return ws[kReadyState] === states.CLOSING
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @returns {boolean}
+ */
+function isClosed (ws) {
+ return ws[kReadyState] === states.CLOSED
+}
+
+/**
+ * @see https://dom.spec.whatwg.org/#concept-event-fire
+ * @param {string} e
+ * @param {EventTarget} target
+ * @param {(...args: ConstructorParameters<typeof Event>) => Event} eventFactory
+ * @param {EventInit | undefined} eventInitDict
+ */
+function fireEvent (e, target, eventFactory = (type, init) => new Event(type, init), eventInitDict = {}) {
+ // 1. If eventConstructor is not given, then let eventConstructor be Event.
+
+ // 2. Let event be the result of creating an event given eventConstructor,
+ // in the relevant realm of target.
+ // 3. Initialize event’s type attribute to e.
+ const event = eventFactory(e, eventInitDict)
+
+ // 4. Initialize any other IDL attributes of event as described in the
+ // invocation of this algorithm.
+
+ // 5. Return the result of dispatching event at target, with legacy target
+ // override flag set if set.
+ target.dispatchEvent(event)
+}
+
+/**
+ * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
+ * @param {import('./websocket').WebSocket} ws
+ * @param {number} type Opcode
+ * @param {Buffer} data application data
+ */
+function websocketMessageReceived (ws, type, data) {
+ // 1. If ready state is not OPEN (1), then return.
+ if (ws[kReadyState] !== states.OPEN) {
+ return
+ }
+
+ // 2. Let dataForEvent be determined by switching on type and binary type:
+ let dataForEvent
+
+ if (type === opcodes.TEXT) {
+ // -> type indicates that the data is Text
+ // a new DOMString containing data
+ try {
+ dataForEvent = utf8Decode(data)
+ } catch {
+ failWebsocketConnection(ws, 'Received invalid UTF-8 in text frame.')
+ return
+ }
+ } else if (type === opcodes.BINARY) {
+ if (ws[kBinaryType] === 'blob') {
+ // -> type indicates that the data is Binary and binary type is "blob"
+ // a new Blob object, created in the relevant Realm of the WebSocket
+ // object, that represents data as its raw data
+ dataForEvent = new Blob([data])
+ } else {
+ // -> type indicates that the data is Binary and binary type is "arraybuffer"
+ // a new ArrayBuffer object, created in the relevant Realm of the
+ // WebSocket object, whose contents are data
+ dataForEvent = toArrayBuffer(data)
+ }
+ }
+
+ // 3. Fire an event named message at the WebSocket object, using MessageEvent,
+ // with the origin attribute initialized to the serialization of the WebSocket
+ // object’s url's origin, and the data attribute initialized to dataForEvent.
+ fireEvent('message', ws, createFastMessageEvent, {
+ origin: ws[kWebSocketURL].origin,
+ data: dataForEvent
+ })
+}
+
+function toArrayBuffer (buffer) {
+ if (buffer.byteLength === buffer.buffer.byteLength) {
+ return buffer.buffer
+ }
+ return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength)
+}
+
+/**
+ * @see https://datatracker.ietf.org/doc/html/rfc6455
+ * @see https://datatracker.ietf.org/doc/html/rfc2616
+ * @see https://bugs.chromium.org/p/chromium/issues/detail?id=398407
+ * @param {string} protocol
+ */
+function isValidSubprotocol (protocol) {
+ // If present, this value indicates one
+ // or more comma-separated subprotocol the client wishes to speak,
+ // ordered by preference. The elements that comprise this value
+ // MUST be non-empty strings with characters in the range U+0021 to
+ // U+007E not including separator characters as defined in
+ // [RFC2616] and MUST all be unique strings.
+ if (protocol.length === 0) {
+ return false
+ }
+
+ for (let i = 0; i < protocol.length; ++i) {
+ const code = protocol.charCodeAt(i)
+
+ if (
+ code < 0x21 || // CTL, contains SP (0x20) and HT (0x09)
+ code > 0x7E ||
+ code === 0x22 || // "
+ code === 0x28 || // (
+ code === 0x29 || // )
+ code === 0x2C || // ,
+ code === 0x2F || // /
+ code === 0x3A || // :
+ code === 0x3B || // ;
+ code === 0x3C || // <
+ code === 0x3D || // =
+ code === 0x3E || // >
+ code === 0x3F || // ?
+ code === 0x40 || // @
+ code === 0x5B || // [
+ code === 0x5C || // \
+ code === 0x5D || // ]
+ code === 0x7B || // {
+ code === 0x7D // }
+ ) {
+ return false
+ }
+ }
+
+ return true
+}
+
+/**
+ * @see https://datatracker.ietf.org/doc/html/rfc6455#section-7-4
+ * @param {number} code
+ */
+function isValidStatusCode (code) {
+ if (code >= 1000 && code < 1015) {
+ return (
+ code !== 1004 && // reserved
+ code !== 1005 && // "MUST NOT be set as a status code"
+ code !== 1006 // "MUST NOT be set as a status code"
+ )
+ }
+
+ return code >= 3000 && code <= 4999
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @param {string|undefined} reason
+ */
+function failWebsocketConnection (ws, reason) {
+ const { [kController]: controller, [kResponse]: response } = ws
+
+ controller.abort()
+
+ if (response?.socket && !response.socket.destroyed) {
+ response.socket.destroy()
+ }
+
+ if (reason) {
+ // TODO: process.nextTick
+ fireEvent('error', ws, (type, init) => new ErrorEvent(type, init), {
+ error: new Error(reason),
+ message: reason
+ })
+ }
+}
+
+/**
+ * @see https://datatracker.ietf.org/doc/html/rfc6455#section-5.5
+ * @param {number} opcode
+ */
+function isControlFrame (opcode) {
+ return (
+ opcode === opcodes.CLOSE ||
+ opcode === opcodes.PING ||
+ opcode === opcodes.PONG
+ )
+}
+
+function isContinuationFrame (opcode) {
+ return opcode === opcodes.CONTINUATION
+}
+
+function isTextBinaryFrame (opcode) {
+ return opcode === opcodes.TEXT || opcode === opcodes.BINARY
+}
+
+function isValidOpcode (opcode) {
+ return isTextBinaryFrame(opcode) || isContinuationFrame(opcode) || isControlFrame(opcode)
+}
+
+/**
+ * Parses a Sec-WebSocket-Extensions header value.
+ * @param {string} extensions
+ * @returns {Map<string, string>}
+ */
+// TODO(@Uzlopak, @KhafraDev): make compliant https://datatracker.ietf.org/doc/html/rfc6455#section-9.1
+function parseExtensions (extensions) {
+ const position = { position: 0 }
+ const extensionList = new Map()
+
+ while (position.position < extensions.length) {
+ const pair = collectASequenceOfCodePointsFast(';', extensions, position)
+ const [name, value = ''] = pair.split('=')
+
+ extensionList.set(
+ removeHTTPWhitespace(name, true, false),
+ removeHTTPWhitespace(value, false, true)
+ )
+
+ position.position++
+ }
+
+ return extensionList
+}
+
+/**
+ * @see https://www.rfc-editor.org/rfc/rfc7692#section-7.1.2.2
+ * @description "client-max-window-bits = 1*DIGIT"
+ * @param {string} value
+ */
+function isValidClientWindowBits (value) {
+ // Must have at least one character
+ if (value.length === 0) {
+ return false
+ }
+
+ // Check all characters are ASCII digits
+ for (let i = 0; i < value.length; i++) {
+ const byte = value.charCodeAt(i)
+
+ if (byte < 0x30 || byte > 0x39) {
+ return false
+ }
+ }
+
+ // Check numeric range: zlib requires windowBits in range 8-15
+ const num = Number.parseInt(value, 10)
+ return num >= 8 && num <= 15
+}
+
+// https://nodejs.org/api/intl.html#detecting-internationalization-support
+const hasIntl = typeof process.versions.icu === 'string'
+const fatalDecoder = hasIntl ? new TextDecoder('utf-8', { fatal: true }) : undefined
+
+/**
+ * Converts a Buffer to utf-8, even on platforms without icu.
+ * @param {Buffer} buffer
+ */
+const utf8Decode = hasIntl
+ ? fatalDecoder.decode.bind(fatalDecoder)
+ : function (buffer) {
+ if (isUtf8(buffer)) {
+ return buffer.toString('utf-8')
+ }
+ throw new TypeError('Invalid utf-8 received.')
+ }
+
+module.exports = {
+ isConnecting,
+ isEstablished,
+ isClosing,
+ isClosed,
+ fireEvent,
+ isValidSubprotocol,
+ isValidStatusCode,
+ failWebsocketConnection,
+ websocketMessageReceived,
+ utf8Decode,
+ isControlFrame,
+ isContinuationFrame,
+ isTextBinaryFrame,
+ isValidOpcode,
+ parseExtensions,
+ isValidClientWindowBits
+}