api: add API for config used in SPA

passbook/api/v2/config.py

@@ -0,0 +1,39 @@
+"""core Configs API"""
+from drf_yasg2.utils import swagger_auto_schema
+from rest_framework.permissions import AllowAny
+from rest_framework.request import Request
+from rest_framework.response import Response
+from rest_framework.serializers import ReadOnlyField, Serializer
+from rest_framework.viewsets import ViewSet
+
+from passbook.lib.config import CONFIG
+
+
+class ConfigSerializer(Serializer):
+    """Serialize passbook Config into DRF Object"""
+
+    branding_logo = ReadOnlyField()
+    branding_title = ReadOnlyField()
+
+    def create(self, request: Request) -> Response:
+        raise NotImplementedError
+
+    def update(self, request: Request) -> Response:
+        raise NotImplementedError
+
+
+class ConfigsViewSet(ViewSet):
+    """Read-only view set that returns the current session's Configs"""
+
+    permission_classes = [AllowAny]
+
+    @swagger_auto_schema(responses={200: ConfigSerializer(many=True)})
+    def list(self, request: Request) -> Response:
+        """Retrive public configuration options"""
+        config = ConfigSerializer(
+            {
+                "branding_logo": CONFIG.y("passbook.branding.logo"),
+                "branding_title": CONFIG.y("passbook.branding.title"),
+            }
+        )
+        return Response(config.data)