user.py

# -*- coding: utf-8 -*-
# input-remapper - GUI for device specific keyboard mappings
# Copyright (C) 2024 sezanzeb <b8x45ygc9@mozmail.com>
#
# This file is part of input-remapper.
#
# input-remapper is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# input-remapper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with input-remapper.  If not, see <https://www.gnu.org/licenses/>.


"""Figure out the user."""


import getpass
import os
import pwd


class UserUtils:
    @staticmethod
    def get_user():
        """Try to find the user who called sudo/pkexec."""
        try:
            return os.getlogin()
        except OSError:
            # failed in some ubuntu installations and in systemd services
            pass

        try:
            user = os.environ["USER"]
        except KeyError:
            # possibly the systemd service. no sudo was used
            return getpass.getuser()

        if user == "root":
            try:
                return os.environ["SUDO_USER"]
            except KeyError:
                # no sudo was used
                pass

            try:
                pkexec_uid = int(os.environ["PKEXEC_UID"])
                return pwd.getpwuid(pkexec_uid).pw_name
            except KeyError:
                # no pkexec was used or the uid is unknown
                pass

        return user

    @staticmethod
    def get_home(user):
        """Try to find the user's home directory."""
        return pwd.getpwnam(user).pw_dir

    # An odd construct, but it can't really be helped because this was done as an
    # afterthought, after I learned about proper object-oriented software architecture.
    # TODO Eventually, UserUtils should be constructed and injected as a UserService,
    #  which then initializes stuff.
    user = get_user()
    home = get_home(user)