Cannot decode URI due case-sensitivity

[LeightonSmallshire]

When trying to parse a uri provided by runescape, the 'algorithm' parameter causes this error;

File "/usr/local/lib/python3.8/dist-packages/pyotp/init.py", line 78, in parse_uri
ValueError: Invalid value for algorithm, must be SHA1, SHA256 or SHA512

stepping through the code shows this is a capitalization issue and should be easily fixed.

Example URI:
'otpauth://totp/playerName?secret=yourB64SecretHere&issuer=RuneScape&algorithm=sha1&digits=6&period=30'

[kislyuk]

Hello, thanks for your interest in PyOTP.

The otpauth URI specification requires the algorithm value to be capitalized. Thus this appears to be an issue in the runescape implementation. I am not inclined to change our treatment of these parameters without overwhelming evidence that other OTP implementations relax the spec in this way and do the case-insensitive matching described here.