From e4450c8417624b71d779cb4f41692538f9165e10 Mon Sep 17 00:00:00 2001
From: sowgro <tpoke.ferrari@gmail.com>
Date: Sat, 2 Sep 2023 19:12:47 -0400
Subject: first commit
---
node_modules/undici/lib/websocket/util.js | 200 ++++++++++++++++++++++++++++++
1 file changed, 200 insertions(+)
create mode 100644 node_modules/undici/lib/websocket/util.js
(limited to 'node_modules/undici/lib/websocket/util.js')
diff --git a/node_modules/undici/lib/websocket/util.js b/node_modules/undici/lib/websocket/util.js
new file mode 100644
index 0000000..6c59b2c
--- /dev/null
+++ b/node_modules/undici/lib/websocket/util.js
@@ -0,0 +1,200 @@
+'use strict'
+
+const { kReadyState, kController, kResponse, kBinaryType, kWebSocketURL } = require('./symbols')
+const { states, opcodes } = require('./constants')
+const { MessageEvent, ErrorEvent } = require('./events')
+
+/* globals Blob */
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ */
+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
+ */
+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
+ */
+function isClosed (ws) {
+ return ws[kReadyState] === states.CLOSED
+}
+
+/**
+ * @see https://dom.spec.whatwg.org/#concept-event-fire
+ * @param {string} e
+ * @param {EventTarget} target
+ * @param {EventInit | undefined} eventInitDict
+ */
+function fireEvent (e, target, eventConstructor = Event, 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 = new eventConstructor(e, eventInitDict) // eslint-disable-line new-cap
+
+ // 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 = new TextDecoder('utf-8', { fatal: true }).decode(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 = new Uint8Array(data).buffer
+ }
+ }
+
+ // 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, MessageEvent, {
+ origin: ws[kWebSocketURL].origin,
+ data: dataForEvent
+ })
+}
+
+/**
+ * @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 (const char of protocol) {
+ const code = char.charCodeAt(0)
+
+ if (
+ code < 0x21 ||
+ code > 0x7E ||
+ char === '(' ||
+ char === ')' ||
+ char === '<' ||
+ char === '>' ||
+ char === '@' ||
+ char === ',' ||
+ char === ';' ||
+ char === ':' ||
+ char === '\\' ||
+ char === '"' ||
+ char === '/' ||
+ char === '[' ||
+ char === ']' ||
+ char === '?' ||
+ char === '=' ||
+ char === '{' ||
+ char === '}' ||
+ code === 32 || // SP
+ code === 9 // HT
+ ) {
+ 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) {
+ fireEvent('error', ws, ErrorEvent, {
+ error: new Error(reason)
+ })
+ }
+}
+
+module.exports = {
+ isEstablished,
+ isClosing,
+ isClosed,
+ fireEvent,
+ isValidSubprotocol,
+ isValidStatusCode,
+ failWebsocketConnection,
+ websocketMessageReceived
+}
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