feat: Disable AudioBasedLatency on non-Android-Chrome platforms (#1009)

src/sources/audio_base_latency.test.ts

@@ -1,12 +1,18 @@
-import { getBrowserVersion, isGecko, isWebKit } from '../../tests/utils'
-import getAudioBaseLatency from './audio_base_latency'
+import { getBrowserVersion, isAndroid, isGecko, isWebKit } from '../../tests/utils'
+import getAudioBaseLatency, { SpecialFingerprint } from './audio_base_latency'
 
 describe('Sources', () => {
   describe('audioBaseLatency', () => {
     it("doesn't fail", () => {
       const result = getAudioBaseLatency()
+      const isAllowedPlatform = isAndroid() || isWebKit()
+      if (!isAllowedPlatform) {
+        expect(result).toBe(SpecialFingerprint.Disabled)
+        return
+      }
+
       if (!hasBaseLatencySupport()) {
-        expect(result).toBe(undefined)
+        expect(result).toBe(SpecialFingerprint.NotSupported)
         return
       }
 

src/sources/audio_base_latency.ts

@@ -1,7 +1,22 @@
-export default function getAudioContextBaseLatency(): number | undefined {
-  if (!window.AudioContext) {
-    return undefined
+import { isAndroid, isWebKit } from '../utils/browser'
+
+export const enum SpecialFingerprint {
+  /** The browser doesn't support AudioContext or baseLatency */
+  NotSupported = -1,
+  /** Entropy source is disabled because of console warnings */
+  Disabled = -2,
+}
+
+export default function getAudioContextBaseLatency(): number {
+  // The signal emits warning in Chrome and Firefox, therefore it is enabled on Safari where it doesn't produce warning
+  // and on Android where it's less visible
+  const isAllowedPlatform = isAndroid() || isWebKit()
+  if (!isAllowedPlatform) {
+    return SpecialFingerprint.Disabled
   }
 
-  return new AudioContext().baseLatency
+  if (!window.AudioContext) {
+    return SpecialFingerprint.NotSupported
+  }
+  return new AudioContext().baseLatency ?? SpecialFingerprint.NotSupported
 }