correct usage of "duration"

api/ovdashboard_api/dav_calendar.py

@@ -82,14 +82,33 @@ class CalEvent(BaseModel):
         """
 
         data = {}
+        keys = ("summary", "description", "dtstart", "dtend", "duration")
 
-        for key in cls().dict().keys():
+        for key in keys:
             try:
                 data[key] = event.contents[key][0].value  # type: ignore
 
             except KeyError:
                 pass
 
+        print(data)
+
+        if "dtend" not in data:
+            data["dtend"] = data["dtstart"]
+
+            if "duration" in data:
+                try:
+                    data["dtend"] += data["duration"]
+
+                except (ValueError, TypeError, AttributeError):
+                    _logger.warn(
+                        "Could not add duration %s to %s",
+                        repr(data["duration"]),
+                        repr(data["dtstart"]),
+                    )
+
+                del data["duration"]
+
         return cls.parse_obj(data)