fix(plugin): bundle Python dependencies for standalone deployment

py_modules/pyotp/contrib/__init__.py

@@ -0,0 +1 @@
+from .steam import Steam  # noqa:F401

py_modules/pyotp/contrib/steam.py

@@ -0,0 +1,40 @@
+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
+        """
+        int_code = int(super().generate_otp(input))
+        total_chars = len(STEAM_CHARS)
+
+        digits = []
+        for _ in range(STEAM_DEFAULT_DIGITS):
+            digits.append(STEAM_CHARS[int_code % total_chars])
+            int_code //= total_chars
+
+        return "".join(digits)