feat(devops): Feature Flagging middleware

ref: #675 #575

app/centurion_feature_flag/middleware/feature_flag.py

@@ -0,0 +1,37 @@
+from app import settings
+from centurion_feature_flag.lib.feature_flag import CenturionFeatureFlagging
+
+
+
+class FeatureFlagMiddleware:
+
+    _feature_flagging: CenturionFeatureFlagging = None
+
+
+    def __init__(self, get_response):
+
+        self.get_response = get_response
+
+        if getattr(settings,'feature_flag', None):
+
+            self._feature_flagging = CenturionFeatureFlagging(
+                url = settings.feature_flag['url'],
+                user_agent = settings.feature_flag['user_agent'],
+                cache_dir = settings.feature_flag['cache_dir']
+            )
+
+
+    def __call__(self, request):
+
+        if(
+            '/flags/' not in request.path
+            and self._feature_flagging is not None
+        ):
+
+            self._feature_flagging.get()
+
+            setattr(request, 'feature_flag', self._feature_flagging)
+
+        return self.get_response(request)
+
+