Add API endpoint to get volunteers names and emails, for tournament organizers only, to easily add juries

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/api/views.py

@@ -1,10 +1,13 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from django.contrib.auth.models import User
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework.viewsets import ModelViewSet
+from rest_framework.filters import SearchFilter
+from rest_framework.permissions import BasePermission, IsAuthenticated, SAFE_METHODS
+from rest_framework.viewsets import ModelViewSet, ReadOnlyModelViewSet
 
-from .serializers import PaymentSerializer, RegistrationSerializer
+from .serializers import BasicUserSerializer, PaymentSerializer, RegistrationSerializer
 from ..models import Payment, Registration
 
 
@@ -20,3 +23,18 @@ class PaymentViewSet(ModelViewSet):
     serializer_class = PaymentSerializer
     filter_backends = [DjangoFilterBackend]
     filterset_fields = ['registrations', 'grouped', 'amount', 'final', 'type', 'valid', ]
+
+
+class IsTournamentOrganizer(BasePermission):
+    def has_permission(self, request, view):
+        reg = request.user.registration
+        return request.method in SAFE_METHODS and reg.is_volunteer and reg.organized_tournaments.exists()
+
+
+class VolunteersViewSet(ReadOnlyModelViewSet):
+    queryset = User.objects.filter(registration__volunteerregistration__isnull=False)
+    serializer_class = BasicUserSerializer
+    permission_classes = [IsAuthenticated & IsTournamentOrganizer]
+    filter_backends = [DjangoFilterBackend, SearchFilter]
+    filterset_fields = ['first_name', 'last_name', 'email', ]
+    search_fields = ['$first_name', '$last_name', '$email', ]