Monkey patch pymongo.auth for Houdini 18.5.351 to avoid "ValueError: unsupported hash type" when connecting MongoDB with Auth enabled (error raised on all version of MongoDB and all versions of PyMongo)

123.py

def patch():
    import hmac
    import hashlib
    from pymongo import auth

    def _hi(hash_name, data, salt, iterations):
        """A simple implementation of PBKDF2-HMAC.

        This is grabed from pymongo.auth module
        https://github.com/mongodb/mongo-python-driver/blob/master/pymongo/auth.py#L200-L218

        Which was being used when the Python cannot import hashlib.pbkdf2_hmac.
        And in this case, seems something wrong with Houdini's hashlib, both Python 2 & 3 build.

        """
        mac = hmac.HMAC(data, None, getattr(hashlib, hash_name))

        def _digest(msg, mac=mac):
            """Get a digest for msg."""
            _mac = mac.copy()
            _mac.update(msg)
            return _mac.digest()

        from_bytes = _from_bytes
        to_bytes = _to_bytes

        _u1 = _digest(salt + b'\x00\x00\x00\x01')
        _ui = from_bytes(_u1, 'big')
        for _ in range(iterations - 1):
            _u1 = _digest(_u1)
            _ui ^= from_bytes(_u1, 'big')
        return to_bytes(_ui, mac.digest_size, 'big')

    setattr(auth, "_hi", _hi)


print("Patching PyMongo ...")
patch()