File permissions checks

apps/files/models.py

@@ -1,3 +1,4 @@
+from django.contrib.auth.models import User
 from django.db import models
 
 from apps.map.models import CaseStudy, CaseStudyDraft
@@ -7,6 +8,9 @@ class BaseFile(models.Model):
     file = models.FileField(
         upload_to='.',
     )
+    user = models.ForeignKey(
+        User, related_name='files'
+    )
 
     class Meta:
         abstract = True