Added API View to check availability of username (#1043)

* Added checkusername api view

* Added changes as requested

* Added changes as requested

care/users/api/viewsets/users.py

@@ -8,8 +8,8 @@
 from rest_framework import mixins, status
 from rest_framework.authtoken.models import Token
 from rest_framework.decorators import action
-from rest_framework.generics import get_object_or_404
-from rest_framework.permissions import IsAuthenticated
+from rest_framework.generics import get_object_or_404, GenericAPIView
+from rest_framework.permissions import IsAuthenticated, AllowAny
 from rest_framework.response import Response
 from rest_framework.serializers import ValidationError
 from rest_framework.viewsets import GenericViewSet
@@ -286,3 +286,17 @@ def pnconfig(self, request, *args, **kwargs):
                 setattr(user, field, request.data[field])
         user.save()
         return Response(status=status.HTTP_200_OK)
+
+class CheckUsernameAPIView(GenericAPIView):
+    """
+    Checks availability of username by getting as query, returns 200 if available, and 409 otherwise.
+    """
+
+    permission_classes = (IsAuthenticated, )
+
+    def get(self, request):
+        username = request.query_params.get('username')
+        user = User.objects.filter(username=username)
+        if user.exists():
+            return Response(status=status.HTTP_409_CONFLICT)
+        return Response(status=status.HTTP_200_OK)   

config/api_router.py

@@ -76,7 +76,7 @@
     WardViewSet,
 )
 from care.users.api.viewsets.skill import SkillViewSet
-from care.users.api.viewsets.users import UserViewSet
+from care.users.api.viewsets.users import UserViewSet, CheckUsernameAPIView
 from care.users.api.viewsets.userskill import UserSkillViewSet
 
 if settings.DEBUG:
@@ -88,6 +88,7 @@
 user_nested_rotuer = NestedSimpleRouter(router, r"users", lookup="users")
 user_nested_rotuer.register("skill", UserSkillViewSet)
 
+router.register("checkusername", CheckUsernameAPIView)
 router.register("skill", SkillViewSet)
 
 router.register("facility", FacilityViewSet)