Add API endpoint to check ticket validity

.gitignore

@@ -1,2 +1,3 @@
 *.py[ocd]
 **/.env
+*.sqlite3

backendapi/converters.py

@@ -0,0 +1,11 @@
+from base64 import b16decode, b16encode
+
+
+class BinaryHexConverter:
+    regex = "(?:[0-9a-fA-F]{2})+"
+
+    def to_python(self, value: str) -> bytes:
+        return b16decode(value, casefold=True)
+
+    def to_url(self, value: bytes) -> str:
+        return b16encode(value).decode()

backendapi/urls.py

@@ -0,0 +1,9 @@
+from django.urls import path, register_converter
+
+from . import views, converters
+
+register_converter(converters.BinaryHexConverter, "hex")
+
+urlpatterns = [
+    path("nfctag/<hex:tag>", views.scanned),
+]

backendapi/views.py

@@ -1,3 +1,18 @@
 from django.shortcuts import render
+from django.views.decorators.http import require_POST
+from django.views.decorators.cache import never_cache
+from django.http import JsonResponse
 
-# Create your views here.
+from database.models import Attendant
+
+
+@require_POST
+@never_cache
+def scanned(request, tag: bytes):
+    try:
+        attendant = Attendant.objects.get(tag=tag)
+        # TODO: Queue event
+        return JsonResponse({"valid": attendant.is_valid}, status=202)
+
+    except Attendant.DoesNotExist:
+        return JsonResponse({"error": "No such tag"}, status=404)

config/settings.py

@@ -37,6 +37,9 @@
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
+    # ---
+    "database",
+    "backendapi",
 ]
 
 MIDDLEWARE = [

config/urls.py

@@ -16,8 +16,11 @@
 """
 
 from django.contrib import admin
-from django.urls import path
+from django.urls import include, path
+
+import backendapi.urls
 
 urlpatterns = [
     path("admin/", admin.site.urls),
+    path("api/", include(backendapi.urls)),
 ]

pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+DJANGO_SETTINGS_MODULE = config.settings
+python_files = tests.py test_*.py *_tests.py