fix timeout UI OTP

[jj-so]

correction of the otp_timeout

[robin-nitrokey]

Can you add some context for this change? The calculation does not make sense to me.

[jj-so]

Previously, the validity period of the OTP was always different because the variable end changes in 30sec increments. By calculating end - start the validity is calculated and this is then added to the current time in order to obtain an exact end time = opt_timeout.

[robin-nitrokey]

OTPs are typically calculated using 30 s time windows starting with the Unix epoch, so this is what we use for the validty:

nitrokey-app2/nitrokeyapp/secrets_tab/worker.py

Lines 294 to 299 in 0d9308c

	period = 30
	now = int(datetime.now().timestamp())
	challenge = now // period
	valid_from = datetime.fromtimestamp(challenge * period)
	valid_until = datetime.fromtimestamp((challenge + 1) * period)
	validity = (valid_from, valid_until)

I still don’t see why this would be wrong. What am I missing here?