1493318 - navigator.mediaDevices.enumerateDevices() triggers App permission dialogs on Android

Status: RESOLVED DUPLICATE of bug 1450762

(Core :: WebRTC, defect, P2)

Description

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Attachment: screenshot1

STRs:
 1. If needed, revoke Camera and Microphone permissions from Firefox in Android's App Manager first.
 2. Open https://jsfiddle.net/jib1/LbtxeLvw/show
 3. Click the [Enumerate Devices!] button only.

Expected results:
 1. No prompt. An empty list of devices.

Actual results:
 1. Prompt appears: "Allow Firefox to take pictures and record video? [DENY] [ALLOW]" (see screenshot1)
 2. I click DENY.
 3. A second prompt appears: "Allow Firefox to record audio? [DENY] [ALLOW]" (see screenshot2)
 4. I click DENY.
 5. I get a list of one audioinput device.

From code inspection, it looks like this regressed in 55 (Bug 1369108).

This happens to me on various web sites where I wouldn't expect it. Presumably, some sites or JS library uses enumerateDevices() for fingerprinting.

I find no spec support for this method triggering permission prompts. The spec mentions permission only wrt device labels.

I'll file an issue on the spec asking for guidance.

Comment 1

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Attachment: screenshot2

Comment 2

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Spec issue: https://github.com/w3c/mediacapture-main/issues/541