#31 API basic implementation

* adds new app to project
* adds relation between User model and new APIUserToken model
* adds first implementation for GET of intervention
* adds basic code layout for future extension by having new versions

api/views/views.py

@@ -0,0 +1,55 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 21.01.22
+
+"""
+from abc import abstractmethod
+
+from django.views import View
+
+
+class AbstractModelAPIView(View):
+    """ Base class for API views
+
+    The API must follow the GeoJSON Specification RFC 7946
+    https://geojson.org/
+    https://datatracker.ietf.org/doc/html/rfc7946
+
+    """
+    model = None
+
+    class Meta:
+        abstract = True
+
+    @abstractmethod
+    def model_to_json(self, entry):
+        """ Defines the returned json values of the model
+
+        Args:
+            entry (): The found entry from the database
+
+        Returns:
+
+        """
+        raise NotImplementedError("Must be implemented in subclasses")
+
+    def fetch_and_serialize(self, lookup_field, lookup_val):
+        """ Serializes the model entry according to the given lookup data
+
+        Args:
+            lookup_field (): Which field used for lookup
+            lookup_val (): Value for lookup
+
+        Returns:
+            serialized_data (dict)
+        """
+        _filters = {
+            lookup_field: lookup_val
+        }
+        qs = self.model.objects.filter(**_filters)
+        serialized_data = {}
+        for entry in qs:
+            serialized_data[str(entry.pk)] = self.model_to_json(entry)
+        return serialized_data