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"""
Management of user groups
=========================

The group module is used to create and manage group settings, groups can be
either present or absent. User/Group names can be passed to the ``adduser``,
``deluser``, and ``members`` parameters. ``adduser`` and ``deluser`` can be used
together but not with ``members``.

In Windows, if no domain is specified in the user or group name (i.e.
``DOMAIN\\username``) the module will assume a local user or group.

.. code-block:: yaml

    cheese:
      group.present:
        - gid: 7648
        - system: True
        - addusers:
          - user1
          - users2
        - delusers:
          - foo

    cheese:
      group.present:
        - gid: 7648
        - system: True
        - members:
          - foo
          - bar
          - user1
          - user2
"""

import sys

import salt.utils.platform
import salt.utils.win_functions


def _get_root_args(local):
    """
    Retrieve args to use for group.info calls depending on platform and the local flag
    """
    if not local or salt.utils.platform.is_windows():
        return {}
    return {"root": "/"}


def _changes(name, gid=None, addusers=None, delusers=None, members=None, local=False):
    """
    Return a dict of the changes required for a group if the group is present,
    otherwise return False.
    """
    lgrp = __salt__["group.info"](name, **_get_root_args(local))
    if not lgrp:
        return False

    # User and Domain names are not case sensitive in Windows. Let's make them
    # all lower case so we can compare properly
    if salt.utils.platform.is_windows():
        if lgrp["members"]:
            lgrp["members"] = [user.lower() for user in lgrp["members"]]
        if members:
            members = [
                salt.utils.win_functions.get_sam_name(user).lower() for user in members
            ]
        if addusers:
            addusers = [
                salt.utils.win_functions.get_sam_name(user).lower() for user in addusers
            ]
        if delusers:
            delusers = [
                salt.utils.win_functions.get_sam_name(user).lower() for user in delusers
            ]

    change = {}
    ret = {}
    if gid:
        try:
            gid = int(gid)
            if lgrp["gid"] != gid:
                change["gid"] = gid
        except (TypeError, ValueError):
            ret["result"] = False
            ret["comment"] = "Invalid gid"
            return ret

    if members is not None and not members:
        if set(lgrp["members"]).symmetric_difference(members):
            change["delusers"] = set(lgrp["members"])
    elif members:
        # if new member list if different than the current
        if set(lgrp["members"]).symmetric_difference(members):
            change["members"] = members

    if addusers:
        users_2add = [user for user in addusers if user not in lgrp["members"]]
        if users_2add:
            change["addusers"] = users_2add

    if delusers:
        users_2del = [user for user in delusers if user in lgrp["members"]]
        if users_2del:
            change["delusers"] = users_2del

    return change


def present(
    name,
    gid=None,
    system=False,
    addusers=None,
    delusers=None,
    members=None,
    non_unique=False,
    local=False,
):
    r"""
    .. versionchanged:: 3006.0

    Ensure that a group is present

    Args:

        name (str):
            The name of the group to manage

        gid (str):
            The group id to assign to the named group; if left empty, then the
            next available group id will be assigned. Ignored on Windows

        system (bool):
            Whether or not the named group is a system group.  This is essentially
            the '-r' option of 'groupadd'. Ignored on Windows

        addusers (list):
            List of additional users to be added as a group members. Cannot
            conflict with names in delusers. Cannot be used in conjunction with
            members.

        delusers (list):
            Ensure these user are removed from the group membership. Cannot
            conflict with names in addusers. Cannot be used in conjunction with
            members.

        members (list):
            Replace existing group members with a list of new members. Cannot be
            used in conjunction with addusers or delusers.

        non_unique (bool):
            Allow creating groups with duplicate (non-unique) GIDs

            .. versionadded:: 3006.0

        local (Only on systems with lgroupadd available):
            Create the group account locally ignoring global account management
            (default is False).

            .. versionadded:: 3007.0

    Example:

    .. code-block:: yaml

        # Adds DOMAIN\db_admins and Administrators to the local db_admin group
        # Removes Users
        db_admin:
          group.present:
            - addusers:
              - DOMAIN\db_admins
              - Administrators
            - delusers:
              - Users

        # Ensures only DOMAIN\domain_admins and the local Administrator are
        # members of the local Administrators group. All other users are
        # removed
        Administrators:
          group.present:
            - members:
              - DOMAIN\domain_admins
              - Administrator
    """
    ret = {
        "name": name,
        "changes": {},
        "result": True,
        "comment": f"Group {name} is present and up to date",
    }

    if members is not None and (addusers is not None or delusers is not None):
        ret["result"] = None
        ret["comment"] = (
            'Error: Conflicting options "members" with "addusers" and/or'
            ' "delusers" can not be used together. '
        )
        return ret

    if addusers and delusers:
        # -- if trying to add and delete the same user(s) at the same time.
        if not set(addusers).isdisjoint(set(delusers)):
            ret["result"] = None
            ret["comment"] = (
                "Error. Same user(s) can not be added and deleted simultaneously"
            )
            return ret

    changes = _changes(name, gid, addusers, delusers, members, local=local)
    if changes:
        ret["comment"] = "The following group attributes are set to be changed:\n"
        for key, val in changes.items():
            ret["comment"] += f"{key}: {val}\n"

        if __opts__["test"]:
            ret["result"] = None
            return ret

        for key, val in changes.items():
            if key == "gid":
                __salt__["group.chgid"](name, gid, non_unique=non_unique)
                continue
            if key == "addusers":
                for user in val:
                    __salt__["group.adduser"](name, user)
                continue
            if key == "delusers":
                for user in val:
                    __salt__["group.deluser"](name, user)
                continue
            if key == "members":
                __salt__["group.members"](name, ",".join(members))
                continue
        # Clear cached group data
        sys.modules[__salt__["test.ping"].__module__].__context__.pop(
            "group.getent", None
        )
        changes = _changes(name, gid, addusers, delusers, members, local=local)
        if changes:
            ret["result"] = False
            ret["comment"] += "Some changes could not be applied"
            ret["changes"] = {"Failed": changes}
        else:
            ret["changes"] = {"Final": "All changes applied successfully"}

    if changes is False:
        # The group is not present, make it!
        if __opts__["test"]:
            ret["result"] = None
            ret["comment"] = f"Group {name} set to be added"
            return ret

        grps = __salt__["group.getent"]()
        # Test if gid is free
        if gid is not None and not non_unique:
            gid_group = None
            for lgrp in grps:
                if lgrp["gid"] == gid:
                    gid_group = lgrp["name"]
                    break

            if gid_group is not None:
                ret["result"] = False
                ret["comment"] = (
                    "Group {} is not present but gid {} is already taken by"
                    " group {}".format(name, gid, gid_group)
                )
                return ret

        # Group is not present, make it.
        if salt.utils.platform.is_windows():
            add_args = {}
        else:
            add_args = {"local": local}
        if __salt__["group.add"](
            name,
            gid=gid,
            system=system,
            non_unique=non_unique,
            **add_args,
        ):
            # if members to be added
            grp_members = None
            if members:
                grp_members = ",".join(members)
            if addusers:
                grp_members = ",".join(addusers)
            if grp_members:
                __salt__["group.members"](name, grp_members)
            # Clear cached group data
            sys.modules[__salt__["test.ping"].__module__].__context__.pop(
                "group.getent", None
            )
            ret["comment"] = f"New group {name} created"
            ret["changes"] = __salt__["group.info"](name, **_get_root_args(local))
            changes = _changes(name, gid, addusers, delusers, members, local=local)
            if changes:
                ret["result"] = False
                ret["comment"] = (
                    "Group {} has been created but, some changes could not"
                    " be applied".format(name)
                )
                ret["changes"] = {"Failed": changes}
        else:
            ret["result"] = False
            ret["comment"] = f"Failed to create new group {name}"
    return ret


def absent(name, local=False):
    """
    Ensure that the named group is absent

    Args:
        name (str):
            The name of the group to remove

        local (Only on systems with lgroupdel available):

            Ensure the group account is removed locally ignoring global
            account management (default is False).

            .. versionadded:: 3007.0

    Example:

    .. code-block:: yaml

        # Removes the local group `db_admin`
        db_admin:
          group.absent
    """
    ret = {"name": name, "changes": {}, "result": True, "comment": ""}
    grp_info = __salt__["group.info"](name, **_get_root_args(local))
    if grp_info:
        # Group already exists. Remove the group.
        if __opts__["test"]:
            ret["result"] = None
            ret["comment"] = f"Group {name} is set for removal"
            return ret
        if salt.utils.platform.is_windows():
            del_args = {}
        else:
            del_args = {"local": local}
        ret["result"] = __salt__["group.delete"](name, **del_args)
        if ret["result"]:
            ret["changes"] = {name: ""}
            ret["comment"] = f"Removed group {name}"
            return ret
        else:
            ret["comment"] = f"Failed to remove group {name}"
            return ret
    else:
        ret["comment"] = "Group not present"
        return ret