feat(blog): notify users about comment activity

apps/blog/api/views.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 import mimetypes
 from pathlib import Path
 from typing import List, Optional
@@ -39,12 +40,14 @@ from apps.blog.permissions import (
     can_review_blog_posts,
     can_write_blog_posts,
 )
+from apps.notifications.services import notify_user
 from core.api.schemas import ErrorSchema, MessageSchema
 from core.authentication import jwt_auth
 
 
 blog_router = Router()
 User = get_user_model()
+logger = logging.getLogger(__name__)
 
 IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp", ".tiff", ".svg"}
 VIDEO_EXTENSIONS = {".mp4", ".webm", ".ogg", ".mov", ".mkv", ".avi"}
@@ -240,6 +243,73 @@ def _interaction_payload(post: Post, user) -> BlogInteractionSchema:
     )
 
 
+def _frontend_blog_url(post: Post) -> str:
+    root = getattr(settings, "FRONTEND_ROOT", "/") or "/"
+    if not root.endswith("/"):
+        root = f"{root}/"
+    return f"{root}blog/{post.slug}"
+
+
+def _blog_moderator_ids() -> set[int]:
+    return set(
+        User.objects.filter(is_active=True)
+        .filter(
+            Q(is_staff=True)
+            | Q(is_superuser=True)
+            | Q(groups__permissions__content_type__app_label="blog", groups__permissions__codename="moderate_blog_comment")
+            | Q(user_permissions__content_type__app_label="blog", user_permissions__codename="moderate_blog_comment")
+        )
+        .distinct()
+        .values_list("id", flat=True)
+    )
+
+
+def _post_author_ids(post: Post) -> set[int]:
+    author_ids = set(post.writers.values_list("id", flat=True))
+    if post.author_id:
+        author_ids.add(post.author_id)
+    return author_ids
+
+
+def _notify_blog_comment(comment: Comment) -> None:
+    post = comment.post
+    actor_id = comment.author_id
+    action_url = _frontend_blog_url(post)
+    excluded_ids = {actor_id}
+
+    if comment.parent_id and comment.parent.author_id != actor_id:
+        notify_user(
+            comment.parent.author_id,
+            {
+                "type": "blog_reply",
+                "title": "پاسخ جدید",
+                "message": f"به کامنت شما در «{post.title}» پاسخ داده شد.",
+                "level": "info",
+                "action_url": action_url,
+                "entity_type": "blog_comment",
+                "entity_id": comment.id,
+                "meta": {"post_id": post.id, "post_slug": post.slug, "parent_id": comment.parent_id},
+            },
+        )
+        excluded_ids.add(comment.parent.author_id)
+
+    recipient_ids = (_blog_moderator_ids() | _post_author_ids(post)) - excluded_ids
+    for user_id in recipient_ids:
+        notify_user(
+            user_id,
+            {
+                "type": "blog_comment",
+                "title": "کامنت جدید",
+                "message": f"برای «{post.title}» کامنت جدید ثبت شد.",
+                "level": "info",
+                "action_url": action_url,
+                "entity_type": "blog_post",
+                "entity_id": post.id,
+                "meta": {"post_id": post.id, "post_slug": post.slug, "comment_id": comment.id},
+            },
+        )
+
+
 @blog_router.get("/admin/writers", response={200: List[AuthorSchema], 403: ErrorSchema}, auth=jwt_auth)
 def list_blog_writers(request):
     if not (request.auth.is_superuser or request.auth.is_staff or can_review_blog_posts(request.auth)):
@@ -619,6 +689,10 @@ def create_comment(request, slug: str, data: CommentCreateSchema):
     if data.parent_id:
         parent = get_object_or_404(Comment, id=data.parent_id, post=post, is_approved=True, is_hidden=False, is_deleted=False)
     comment = Comment.objects.create(post=post, author=request.auth, content=data.content, parent=parent)
+    try:
+        _notify_blog_comment(comment)
+    except Exception:
+        logger.exception("Failed to send blog comment notifications for comment=%s", comment.id)
     return 201, comment