feat(reactions): add message reactions API and web quick reactions

app/messages/service.py

@@ -8,7 +8,14 @@ from app.chats.service import ensure_chat_membership
 from app.messages import repository
 from app.messages.models import Message
 from app.messages.spam_guard import enforce_message_spam_policy
-from app.messages.schemas import MessageCreateRequest, MessageForwardRequest, MessageStatusUpdateRequest, MessageUpdateRequest
+from app.messages.schemas import (
+    MessageCreateRequest,
+    MessageForwardRequest,
+    MessageReactionRead,
+    MessageReactionToggleRequest,
+    MessageStatusUpdateRequest,
+    MessageUpdateRequest,
+)
 from app.notifications.service import dispatch_message_notifications
 from app.users.repository import has_block_relation_between_users
 from app.users.service import get_user_by_id
@@ -267,3 +274,43 @@ async def forward_message(
     await db.commit()
     await db.refresh(forwarded)
     return forwarded
+
+
+async def list_message_reactions(
+    db: AsyncSession,
+    *,
+    message_id: int,
+    user_id: int,
+) -> list[MessageReactionRead]:
+    message = await repository.get_message_by_id(db, message_id)
+    if not message:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Message not found")
+    await ensure_chat_membership(db, chat_id=message.chat_id, user_id=user_id)
+    counts = await repository.list_message_reactions(db, message_id=message_id)
+    mine = await repository.get_message_reaction(db, message_id=message_id, user_id=user_id)
+    mine_emoji = mine.emoji if mine else None
+    return [
+        MessageReactionRead(emoji=emoji, count=count, reacted=(emoji == mine_emoji))
+        for emoji, count in counts
+    ]
+
+
+async def toggle_message_reaction(
+    db: AsyncSession,
+    *,
+    message_id: int,
+    user_id: int,
+    payload: MessageReactionToggleRequest,
+) -> list[MessageReactionRead]:
+    message = await repository.get_message_by_id(db, message_id)
+    if not message:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Message not found")
+    await ensure_chat_membership(db, chat_id=message.chat_id, user_id=user_id)
+    await repository.upsert_message_reaction(
+        db,
+        message_id=message_id,
+        user_id=user_id,
+        emoji=payload.emoji.strip(),
+    )
+    await db.commit()
+    return await list_message_reactions(db, message_id=message_id, user_id=user_id)