+from django.utils import simplejson
+from django.conf import settings
+from django.http import Http404, HttpResponseForbidden
+from django.views.decorators.cache import never_cache
+from django.views.decorators.csrf import csrf_exempt
+
+from .models import Submission, DEBUG_KEY, exercises
+from .forms import WTEMForm
+
+WTEM_CONTEST_STAGE = getattr(settings, 'WTEM_CONTEST_STAGE', 'before')
+
+
+@csrf_exempt
+def form(request, key):
+ return globals()['form_' + WTEM_CONTEST_STAGE](request, key)
+
+def form_before(request, key):
+ try:
+ submission = Submission.objects.get(key = key)
+ except:
+ return render(request, 'wtem/key_not_found_before.html')
+ else:
+ return render(request, 'wtem/main_before.html')
+
+def form_after(request, key):
+ return render(request, 'wtem/main_after.html')
+
+@never_cache
+@csrf_exempt
+def form_during(request, key):
+
+ if WTEM_CONTEST_STAGE != 'during':
+ if request.META['REMOTE_ADDR'] not in getattr(settings, 'WTEM_CONTEST_IP_ALLOW', []):
+ return HttpResponseForbidden('Not allowed')