events: disabled manual construction AbortSignal

Fixes: #36064 PR-URL: #36094 Backport-PR-URL: #38386 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Zeyu Yang <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: Rich Trott <[email protected]>
nodejs · Apr 30, 2021 · 64cd54b · 64cd54b
1 parent daad521
commit 64cd54b
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Showing 2 changed files with 25 additions and 2 deletions.
diff --git a/lib/internal/abort_controller.js b/lib/internal/abort_controller.js
@@ -5,7 +5,9 @@
 
 const {
   Object,
+  ObjectSetPrototypeOf,
   Symbol,
+  TypeError,
 } = primordials;
 
 const {
@@ -34,6 +36,11 @@ function customInspect(self, obj, depth, options) {
 }
 
 class AbortSignal extends EventTarget {
+  constructor() {
+    // eslint-disable-next-line no-restricted-syntax
+    throw new TypeError('Illegal constructor');
+  }
+
   get aborted() { return !!this[kAborted]; }
 
   [customInspectSymbol](depth, options) {
@@ -49,6 +56,13 @@ Object.defineProperties(AbortSignal.prototype, {
 
 defineEventHandler(AbortSignal.prototype, 'abort');
 
+function createAbortSignal() {
+  const signal = new EventTarget();
+  ObjectSetPrototypeOf(signal, AbortSignal.prototype);
+  signal[kAborted] = false;
+  return signal;
+}
+
 function abortSignal(signal) {
   if (signal[kAborted]) return;
   signal[kAborted] = true;
@@ -64,7 +78,7 @@ function abortSignal(signal) {
 const kSignal = Symbol('signal');
 class AbortController {
   constructor() {
-    this[kSignal] = new AbortSignal();
+    this[kSignal] = createAbortSignal();
     emitExperimentalWarning('AbortController');
   }
 

diff --git a/test/parallel/test-abortcontroller.js b/test/parallel/test-abortcontroller.js
@@ -3,7 +3,7 @@
 
 const common = require('../common');
 
-const { ok, strictEqual } = require('assert');
+const { ok, strictEqual, throws } = require('assert');
 const { Event } = require('internal/event_target');
 
 {
@@ -52,3 +52,12 @@ const { Event } = require('internal/event_target');
   strictEqual(firstTrusted, secondTrusted);
   strictEqual(untrusted, firstTrusted);
 }
+
+{
+  // Tests that AbortSignal is impossible to construct manually
+  const ac = new AbortController();
+  throws(
+    () => new ac.signal.constructor(),
+    /^TypeError: Illegal constructor$/
+  );
+}