add contest list api

contest/views/admin.py

@@ -1,5 +1,7 @@
 import dateutil.parser
 from utils.api import APIView, validate_serializer
+from django.utils import timezone
+from account.models import AdminType
 from ..serializers import CreateConetestSeriaizer, ContestSerializer
 from ..models import Contest
 
@@ -11,10 +13,24 @@ class ContestAPI(APIView):
         data["start_time"] = dateutil.parser.parse(data["start_time"])
         data["end_time"] = dateutil.parser.parse(data["end_time"])
         data["created_by"] = request.user
-        print(data)
+        if data["end_time"] <= data["start_time"]:
+            return self.error("Start time must occur earlier than end time")
+        if not data["password"]:
+            data["password"] = None
         Contest.objects.create(**data)
-        print(request.data)
         return self.success()
 
     def get(self, request):
-        return self.success(ContestSerializer(Contest.objects.all(), many=True).data)
+        contest_id = request.GET.get("id")
+        if contest_id:
+            try:
+                contest = Contest.objects.get(id=contest_id)
+                if request.user.is_admin_role():
+                    contest = contest.get(created_by=request.user)
+                return self.success(ContestSerializer(contest).data)
+            except Contest.DoesNotExist:
+                return self.error("Contest does not exist")
+        contests = Contest.objects.all().order_by("-create_time")
+        if request.user.is_admin_role():
+            contests = contests.filter(created_by=request.user)
+        return self.success(self.paginate_data(request, contests, ContestSerializer))