admin: add metrics and charts

passbook/admin/views/overview.py

@@ -3,6 +3,8 @@ from typing import Union
 
 from django.conf import settings
 from django.core.cache import cache
+from django.db.models import Count
+from django.db.models.fields.json import KeyTextTransform
 from django.shortcuts import redirect, reverse
 from django.views.generic import TemplateView
 from packaging.version import LegacyVersion, Version, parse
@@ -10,10 +12,9 @@ from packaging.version import LegacyVersion, Version, parse
 from passbook import __version__
 from passbook.admin.mixins import AdminRequiredMixin
 from passbook.admin.tasks import VERSION_CACHE_KEY, update_latest_version
-from passbook.core.models import Application, Provider, Source, User
-from passbook.flows.models import Flow, Stage
+from passbook.audit.models import Event, EventAction
+from passbook.core.models import Provider, User
 from passbook.policies.models import Policy
-from passbook.stages.invitation.models import Invitation
 
 
 class AdministrationOverviewView(AdminRequiredMixin, TemplateView):
@@ -37,17 +38,27 @@ class AdministrationOverviewView(AdminRequiredMixin, TemplateView):
             return parse(__version__)
         return parse(version_in_cache)
 
+    def get_most_used_applications(self):
+        """Get Most used applications, total login counts and unique users that have used them."""
+        return (
+            Event.objects.filter(action=EventAction.AUTHORIZE_APPLICATION)
+            .exclude(context__authorized_application=None)
+            .annotate(application=KeyTextTransform("authorized_application", "context"))
+            .annotate(user_pk=KeyTextTransform("pk", "user"))
+            .values("application")
+            .annotate(total_logins=Count("application"))
+            .annotate(unique_users=Count("user_pk", distinct=True))
+            .values("unique_users", "application", "total_logins")
+            .order_by("-total_logins")[:15]
+        )
+
     def get_context_data(self, **kwargs):
-        kwargs["application_count"] = len(Application.objects.all())
         kwargs["policy_count"] = len(Policy.objects.all())
         kwargs["user_count"] = len(User.objects.all()) - 1  # Remove anonymous user
         kwargs["provider_count"] = len(Provider.objects.all())
-        kwargs["source_count"] = len(Source.objects.all())
-        kwargs["stage_count"] = len(Stage.objects.all())
-        kwargs["flow_count"] = len(Flow.objects.all())
-        kwargs["invitation_count"] = len(Invitation.objects.all())
         kwargs["version"] = parse(__version__)
         kwargs["version_latest"] = self.get_latest_version()
+        kwargs["most_used_applications"] = self.get_most_used_applications()
         kwargs["providers_without_application"] = Provider.objects.filter(
             application=None
         )