#31 API basic implementation Token Authentication

* adds token checking to AbstractModelAPIView
* adds user accessibility filtering for intervention API v1
* extends fetch_and_serialize() method to take a dict for db filtering instead of a single field and value
* organizes urlnames into supporting formats like "api:v1:intervention"

api/views/views.py

@@ -7,8 +7,12 @@ Created on: 21.01.22
 """
 from abc import abstractmethod
 
+from django.http import JsonResponse
 from django.views import View
 
+from api.models import APIUserToken
+from api.settings import KSP_TOKEN_HEADER_IDENTIFIER
+
 
 class AbstractModelAPIView(View):
     """ Base class for API views
@@ -19,6 +23,7 @@ class AbstractModelAPIView(View):
 
     """
     model = None
+    user = None
 
     class Meta:
         abstract = True
@@ -35,21 +40,29 @@ class AbstractModelAPIView(View):
         """
         raise NotImplementedError("Must be implemented in subclasses")
 
-    def fetch_and_serialize(self, lookup_field, lookup_val):
+    def fetch_and_serialize(self, _filter):
         """ Serializes the model entry according to the given lookup data
 
         Args:
-            lookup_field (): Which field used for lookup
-            lookup_val (): Value for lookup
+            _filter (dict): Lookup declarations
 
         Returns:
             serialized_data (dict)
         """
-        _filters = {
-            lookup_field: lookup_val
-        }
-        qs = self.model.objects.filter(**_filters)
+        qs = self.model.objects.filter(**_filter)
         serialized_data = {}
         for entry in qs:
             serialized_data[str(entry.pk)] = self.model_to_json(entry)
         return serialized_data
+
+    def dispatch(self, request, *args, **kwargs):
+        try:
+            self.user = APIUserToken.get_user_from_token(request.headers.get(KSP_TOKEN_HEADER_IDENTIFIER, None))
+        except PermissionError as e:
+            return JsonResponse(
+                {
+                    "error": e.__str__()
+                },
+                status=403
+            )
+        return super().dispatch(request, *args, **kwargs)