Introduce a middleware that allows for HttpResponses to be thrown from inner utility functions, to avoid boilerplate in views

lemoncurry/middleware.py

@@ -0,0 +1,14 @@
+from django.http import HttpRequest, HttpResponse
+from django.utils.deprecation import MiddlewareMixin
+
+
+class ResponseException(Exception):
+    def __init__(self, response: HttpResponse) -> None:
+        self.response = response
+
+
+class ResponseExceptionMiddleware(MiddlewareMixin):
+    def process_exception(self, request: HttpRequest, exception: Exception) -> HttpResponse:
+        if isinstance(exception, ResponseException):
+            return exception.response
+        raise exception

lemoncurry/settings/base.py

@@ -118,6 +118,7 @@ MIDDLEWARE = [
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.contrib.sites.middleware.CurrentSiteMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'lemoncurry.middleware.ResponseExceptionMiddleware',
 ]
 
 ROOT_URLCONF = 'lemoncurry.urls'