Tor does not allow scanning QR-codes for PSBT-txs (Cobo etc.)

[TheTotalConnector]

I am still unable to scan QR-codes via Tor for PSBT-txs with Cobo.
error messages on specter, when I try to activate the QR-code.
Thanks.

[k9ert]

Is this maybe a duplicate of #448 ? Using QR-code with Tor has two issues, #448 and the inability to use the camera. Whereas #448 has a more or less easy workaround, using the camera is much more severe.

[stepansnigirev]

@k9ert #448 is about showing QR codes, this one is about scanning QR codes.

[k9ert]

I stumbled over this and spent some time on it. Here are some findings:

• I think there is some standardisation around browsers and it's called "Image Capture" and here someone is tracking it over different browsers (but not the tor-browser) and here is (just slightly related) a an issue within a project, managing secure firefox-settings, which tries to get the camera to work. So related settings might be:

/* 2023: disable camera stuff /
user_pref("camera.control.face_detection.enabled", false);
/ 2026: disable canvas capture stream
user_pref("canvas.capturestream.enabled", false);
/ 2027: disable camera image capture
user_pref("dom.imagecapture.enabled", false);
/ 2028: disable offscreen canvas
user_pref("gfx.offscreencanvas.enabled", false);
 and maybe:
media.autoplay.enabled = true

But is that stuff even implemented in the tor-browser-project? So i found this issue within the quite difficult to find tor-project which somehow seem to kick some kind of related can down the road. I'm not sure this ticket is talking about dynamic-properties which potentially could be switched in the tor-browser or whether it's somehow hardcoding settings which make the dynamic set useless.
So experimenting with these values or asking on that ticket or creating a new one there is probably the way forward.
For now, simply licking the comment-button to not loose these links ...

[k9ert]

So, removing the check in qr-scanner.html#L185 reveals an error-message like:
navigator.mediaDevices is undefined. I've requested a userAccount in order to create a tor-browser issue but it takes time until that gets approved. I'll report back here.

[k9ert]

I've created a small dummy-project to reproduce the issue more easily:
https://github.com/k9ert/camera-tor

[k9ert]

I requested access today a second time after i haven't got any feedback from the first try:
https://gitlab.onionize.space/

[k9ert]

Created an issue:
https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/40269

[k9ert]

For the reference: Asked for feedback also in january but unfortunately no activity on the ticket so far.
https://twitter.com/k9ert/status/1346109365795893249

[Mohsen7s]

Any update on this issue ?

[k9ert]

Doesn't seem so :-(. I agree completely with Mohix here.