misc: avoid circular imports (#21978)

passerelle/utils/__init__.py

@@ -35,7 +35,6 @@ from django.views.generic.detail import SingleObjectMixin
 from django.contrib.contenttypes.models import ContentType
 from django.db import transaction
 
-from passerelle.base.models import ApiUser, AccessRight, BaseResource
 from passerelle.base.signature import check_query, check_url
 
 
@@ -55,6 +54,8 @@ def response_for_json(request, data):
 
 
 def get_request_users(request):
+    from passerelle.base.models import ApiUser
+
     users = []
 
     users.extend(ApiUser.objects.filter(keytype=''))
@@ -118,6 +119,8 @@ def is_trusted(request):
 
 
 def is_authorized(request, obj, perm):
+    from passerelle.base.models import AccessRight
+
     if is_trusted(request):
         return True
     resource_type = ContentType.objects.get_for_model(obj)
@@ -271,6 +274,9 @@ class Request(RequestSession):
 
 def export_site():
     '''Dump passerelle configuration (users, resources and ACLs) to JSON dumpable dictionnary'''
+    from passerelle.base.models import ApiUser
+    from passerelle.base.models import BaseResource
+
     d = {}
     d['apiusers'] = [apiuser.export_json() for apiuser in ApiUser.objects.all()]
     d['resources'] = resources = []
@@ -289,6 +295,9 @@ def import_site(d, if_empty=False, clean=False, overwrite=False, import_users=Fa
     '''Load passerelle configuration (users, resources and ACLs) from a dictionnary loaded from
        JSON
     '''
+    from passerelle.base.models import ApiUser
+    from passerelle.base.models import BaseResource
+
     d = d.copy()
 
     def is_empty():