From b3bf508815b43ece5078b1ffd86db74acf0e51ce Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Fri, 20 Apr 2018 02:13:48 +0200
Subject: [PATCH] implement django-admin users --stale-check

deletes users who have not logged in for >= 1y and
have no hosts and domains.
---
 nsupdate/management/commands/users.py | 85 +++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 nsupdate/management/commands/users.py

diff --git a/nsupdate/management/commands/users.py b/nsupdate/management/commands/users.py
new file mode 100644
index 00000000..45d6d165
--- /dev/null
+++ b/nsupdate/management/commands/users.py
@@ -0,0 +1,85 @@
+"""
+dealing with users (User records in our database)
+"""
+
+from datetime import datetime
+
+from django.contrib.auth import get_user_model
+from django.core.management.base import BaseCommand
+from django.db import transaction
+from django.utils import timezone
+from django.utils.translation import ugettext_lazy as _
+
+from nsupdate.main.models import Host, Domain
+
+DAY = 24 * 3600  # [s]
+T_age = 365 * DAY  # min. age of last login for considering deletion of a user
+
+NEVER = datetime.fromtimestamp(DAY, timezone.utc)  # 2.1.1970
+
+LOG_MSG_DELETE = _("%%(user)s hasn't logged in for %(age)fy, has no hosts and no domains -> deleted user.")
+LOG_MSG_HAS_HOSTS = _("%%(user)s kept, has hosts. age: %(age)fy, hosts: %(hosts)d.")
+LOG_MSG_HAS_DOMAINS = _("%%(user)s kept, has domains. age: %(age)fy, hosts: %(hosts)d, domains: %(domains)d.")
+LOG_MSG_RECENTLY_USED = _("%(user)s kept, was used recently.")
+
+
+def check_staleness(u):
+    """
+    checks the staleness of User u (has not logged in for a longer time,
+    has no hosts and no domains) and if it is stale, delete it.
+
+    Return log msg (can be None).
+
+    :param u: user instance
+    :return: deleted, log_msg
+    """
+    t_now = timezone.now()
+    t_last_login = u.last_login or NEVER
+    age = (t_now - t_last_login).total_seconds()
+    if age < T_age:
+        log_msg = LOG_MSG_RECENTLY_USED
+    else:
+        age_y = age / 365.0 / DAY
+        host_count = Host.objects.filter(created_by=u).count()
+        if host_count > 0:
+            log_msg = LOG_MSG_HAS_HOSTS % dict(age=age_y, hosts=host_count)
+        else:
+            domain_count = Domain.objects.filter(created_by=u).count()
+            if domain_count > 0:
+                log_msg = LOG_MSG_HAS_DOMAINS % dict(age=age_y, hosts=host_count, domains=domain_count)
+            else:
+                # is not recently used, has no hosts, no domains
+                u.delete()
+                log_msg = LOG_MSG_DELETE % dict(age=age_y)
+    return log_msg
+
+
+class Command(BaseCommand):
+    help = 'deal with users'
+
+    def add_arguments(self, parser):
+        parser.add_argument('--stale-check',
+                            action='store_true',
+                            dest='stale_check',
+                            default=False,
+                            help='check whether user has logged in recently and has hosts or domains, delete if not')
+
+    def handle(self, *args, **options):
+        def print_stats(when):
+            user_count = User.objects.all().count()
+            host_count = Host.objects.all().count()
+            domain_count = Domain.objects.all().count()
+            print("%s: users: %d, hosts %d, domains: %d" % (when, user_count, host_count, domain_count))
+
+        stale_check = options['stale_check']
+        User = get_user_model()
+        with transaction.atomic():
+            print_stats("before")
+            for u in User.objects.all():
+                user = "%s <%s>" % (u.username, u.email)
+                if stale_check:
+                    log_msg = check_staleness(u)
+                if log_msg:
+                    log_msg = log_msg % dict(user=user)
+                    self.stdout.write(log_msg)
+            print_stats("after")
\ No newline at end of file