root(major): add prometheus

passbook/root/monitoring.py

@@ -0,0 +1,21 @@
+"""Metrics view"""
+from base64 import b64encode
+from django.conf import settings
+from django.views import View
+from django.http import HttpRequest, HttpResponse, Http404
+from django_prometheus.exports import ExportToDjangoView
+
+class MetricsView(View):
+    """Wrapper around ExportToDjangoView, using http-basic auth"""
+
+    def get(self, request: HttpRequest) -> HttpResponse:
+        """Check for HTTP-Basic auth"""
+        auth_header = request.META.get('HTTP_AUTHORIZATION', '')
+        token_type, _, credentials = auth_header.partition(' ')
+        creds = f"monitor:{settings.SECRET_KEY}"
+        expected = b64encode(str.encode(creds)).decode()
+
+        if token_type != 'Basic' or credentials != expected:
+            raise Http404
+
+        return ExportToDjangoView(request)