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# Copyright (C) 2014 Andrey Antukh <niwi@niwi.be>
# Copyright (C) 2014 Jesús Espino <jespinog@gmail.com>
# Copyright (C) 2014 David Barragán <bameda@dbarragan.com>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from django.db import transaction as tx
from django.apps import apps

from taiga.base.utils.slug import slugify_uniquely
from taiga.base import response
from taiga.auth.services import make_auth_response_data
from taiga.auth.signals import user_registered as user_registered_signal

from . import connector


@tx.atomic
def ldap_register(username: str, email: str, full_name: str):
    """
    Register a new user from LDAP.

    This can raise `exc.IntegrityError` exceptions in
    case of conflict found.

    :returns: User
    """
    user_model = apps.get_model("users", "User")

    try:
        # LDAP user association exist?
        user = user_model.objects.get(username=username)
    except user_model.DoesNotExist:
        # Create a new user
        username_unique = slugify_uniquely(username, user_model, slugfield="username")
        user = user_model.objects.create(email=email,
                                         username=username_unique,
                                         full_name=full_name)
        user_registered_signal.send(sender=user.__class__, user=user)

    return user


def ldap_login_func(request):
    username = request.DATA.get('username', None)
    password = request.DATA.get('password', None)

    email, full_name = connector.login(username=username, password=password)
    user = ldap_register(username=username, email=email, full_name=full_name)
    data = make_auth_response_data(user)
    return response.Ok(data)