✨(api) allow to list and create Mailboxes

Simply display all Mailboxes create for a MailDomain.
LDAP connection is not yet available, it will be implemented soon.
Read and create permissions will be refined soon too.

src/backend/mailbox_manager/api/viewsets.py

@@ -0,0 +1,47 @@
+"""API endpoints"""
+
+from rest_framework import mixins, viewsets
+from rest_framework import permissions as drf_permissions
+
+from mailbox_manager import models
+
+from . import serializers
+
+
+class MailDomainViewSet(
+    mixins.ListModelMixin,
+    viewsets.GenericViewSet,
+):
+    """MailDomain ViewSet"""
+
+    permission_classes = [drf_permissions.IsAuthenticated]
+    serializer_class = serializers.MailDomainSerializer
+    queryset = models.MailDomain.objects.all()
+
+
+class MailBoxViewSet(
+    mixins.CreateModelMixin,
+    mixins.ListModelMixin,
+    viewsets.GenericViewSet,
+):
+    """MailBox ViewSet"""
+
+    permission_classes = [drf_permissions.IsAuthenticated]
+    serializer_class = serializers.MailboxSerializer
+    queryset = models.Mailbox.objects.all()
+
+    def get_queryset(self):
+        """Custom queryset to get mailboxes related to a mail domain."""
+        domain_id = self.kwargs.get("domain_id", "")
+        if domain_id:
+            return self.queryset.filter(domain__id=domain_id)
+        return self.queryset
+
+    def perform_create(self, serializer):
+        """Create new mailbox."""
+        domain_id = self.kwargs.get("domain_id", "")
+        if domain_id:
+            serializer.validated_data["domain"] = models.MailDomain.objects.get(
+                id=domain_id
+            )
+        super().perform_create(serializer)