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apps/messaging/services.py

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+from django.core.exceptions import PermissionDenied
+from django.db import transaction
+from django.utils import timezone
+from apps.core.persian_text import normalize_persian_text
+from apps.tickets.policies import TicketPolicy
+from .models import Message,MessageRevision
+@transaction.atomic
+def edit_message(message_id,user,body):
+    msg=Message.objects.select_for_update().select_related("ticket").get(pk=message_id)
+    if msg.author_id!=user.id or not TicketPolicy.can_view(user,msg.ticket): raise PermissionDenied
+    if not (user.account_type=="CUSTOMER" or user.has_perm("messaging.edit_own_message")): raise PermissionDenied
+    if msg.deleted_at: raise PermissionDenied
+    body=normalize_persian_text(body,multiline=True)
+    if not body: raise ValueError("متن پیام نمی‌تواند خالی باشد.")
+    MessageRevision.objects.create(message=msg,body=msg.body,edited_by=user); msg.body=body; msg.edited_at=timezone.now(); msg.save(update_fields=["body","edited_at","updated_at"]); return msg
+@transaction.atomic
+def soft_delete_message(message_id,user):
+    msg=Message.objects.select_for_update().select_related("ticket").get(pk=message_id)
+    may_delete=user.account_type=="CUSTOMER" or user.has_perm("messaging.delete_own_message")
+    if msg.author_id!=user.id or not may_delete or not TicketPolicy.can_view(user,msg.ticket): raise PermissionDenied
+    msg.deleted_at=timezone.now(); msg.deleted_by=user; msg.save(update_fields=["deleted_at","deleted_by","updated_at"]); return msg