.

generic/models.py

@@ -127,6 +127,15 @@ class ExamBase(models.Model):
         """Returns a comma seperated text list of authors"""
         authors = [i for i in self.author.all()]
         return authors
+    
+    def check_cid_user(self, cid, passcode):
+        if self.valid_users.exists():
+            user = self.valid_users.filter(cid=cid).first()
+
+            if not user or user.passcode != passcode:
+                return False
+
+        return True
 
 
 class NoteType(models.Model):

physics/views.py

@@ -323,13 +323,8 @@ def exam_take(request, pk, sk, cid, passcode=None):
     if not exam.active:
         raise Http404("Exam not found")
 
-    if exam.valid_users.exists():
-        user = exam.valid_users.filter(cid=cid).first()
-
-        if not user:
-            raise Http404("Exam not found")
-        if user.passcode != passcode:
-            raise Http404("Invalid passcode")
+    if not exam.check_cid_user(cid, passcode):
+        raise Http404("Error accessing exam")
 
     question = exam.exam_questions.all()[sk]