core: add num_pk to group for applications that need a numerical group id

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

#2497

authentik/core/api/groups.py

@@ -4,7 +4,7 @@ from json import loads
 from django.db.models.query import QuerySet
 from django_filters.filters import CharFilter, ModelMultipleChoiceFilter
 from django_filters.filterset import FilterSet
-from rest_framework.fields import CharField, JSONField
+from rest_framework.fields import CharField, IntegerField, JSONField
 from rest_framework.serializers import ListSerializer, ModelSerializer, ValidationError
 from rest_framework.viewsets import ModelViewSet
 from rest_framework_guardian.filters import ObjectPermissionsFilter
@@ -46,11 +46,14 @@ class GroupSerializer(ModelSerializer):
     )
     parent_name = CharField(source="parent.name", read_only=True)
 
+    num_pk = IntegerField(read_only=True)
+
     class Meta:
 
         model = Group
         fields = [
             "pk",
+            "num_pk",
             "name",
             "is_superuser",
             "parent",

authentik/core/models.py

@@ -81,6 +81,13 @@ class Group(models.Model):
     )
     attributes = models.JSONField(default=dict, blank=True)
 
+    @property
+    def num_pk(self) -> int:
+        """Get a numerical, int32 ID for the group"""
+        # int max is 2147483647 (10 digits) so 9 is the max usable
+        # in the LDAP Outpost we use the last 5 chars so match here
+        return int(str(self.pk.int)[:5])
+
     def is_member(self, user: "User") -> bool:
         """Recursively check if `user` is member of us, or any parent."""
         query = """