Map ping with sound (custom MP3 per lobby)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJhXuLD2Z6hv3Wqeq9UL9K

backend/app/maps.py

@@ -774,6 +774,29 @@ def install(api, db, current_user, lobby_for, dm_only, hub, event, store_dir: Pa
         hub.notify(lid, "map")
         return {"ok": True}
 
+    pinged: dict = {}
+
+    @api.post("/lobbies/{lid}/ping")
+    def ping(lid: str, body: dict = Body(...), user: dict = Depends(current_user)):
+        """Anybody at the table can point at a spot of the map; everybody sees a ring there (and hears a ping)."""
+        with db() as con:
+            lobby = lobby_for(con, lid, user)
+            m = need_map(con, lobby)
+            try:
+                x, y = float(body.get("x")), float(body.get("y"))
+            except (TypeError, ValueError):
+                raise HTTPException(422, "Invalid position")
+            if not (0 <= x <= m["w"] and 0 <= y <= m["h"]):
+                raise HTTPException(422, "Outside of the map")
+        now = time.time()
+        if now - pinged.get((lid, user["id"]), 0) < 0.8:
+            raise HTTPException(429, "Slow down")
+        pinged[(lid, user["id"])] = now
+        if len(pinged) > 2000:
+            pinged.clear()
+        hub.notify(lid, "ping", delay=0, x=round(x, 1), y=round(y, 1), user=user["username"], dm=lobby["owner_id"] == user["id"])
+        return {"ok": True}
+
     @api.put("/lobbies/{lid}/sight")
     def set_sight(lid: str, body: dict = Body(...), user: dict = Depends(current_user)):
         """DM: switch line of sight on or off for the table (off: players see the whole map)."""