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import hashlib
from typing import Optional
from ..totp import TOTP
STEAM_CHARS = "23456789BCDFGHJKMNPQRTVWXY" # steam's custom alphabet
STEAM_DEFAULT_DIGITS = 5 # Steam TOTP code length
class Steam(TOTP):
"""
Steam's custom TOTP. Subclass of `pyotp.totp.TOTP`.
"""
def __init__(
self,
s: str,
name: Optional[str] = None,
issuer: Optional[str] = None,
interval: int = 30,
digits: int = 5
) -> None:
"""
:param s: secret in base32 format
:param interval: the time interval in seconds for OTP. This defaults to 30.
:param name: account name
:param issuer: issuer
"""
self.interval = interval
super().__init__(s=s, digits=10, digest=hashlib.sha1, name=name, issuer=issuer)
def generate_otp(self, input: int) -> str:
"""
:param input: the HMAC counter value to use as the OTP input.
Usually either the counter, or the computed integer based on the Unix timestamp
"""
str_code = super().generate_otp(input)
int_code = int(str_code)
steam_code = ""
total_chars = len(STEAM_CHARS)
for _ in range(STEAM_DEFAULT_DIGITS):
pos = int_code % total_chars
char = STEAM_CHARS[int(pos)]
steam_code += char
int_code //= total_chars
return steam_code