Edit license plate in Tracked Object Details (#17631)

* api endpoint

* frontend

* only allow admins to edit sub labels and plates

frigate/api/event.py

@@ -31,6 +31,7 @@ from frigate.api.defs.request.events_body import (
     EventsDeleteBody,
     EventsDescriptionBody,
     EventsEndBody,
+    EventsLPRBody,
     EventsSubLabelBody,
     SubmitPlusBody,
 )
@@ -1101,6 +1102,60 @@ def set_sub_label(
     )
 
 
+@router.post(
+    "/events/{event_id}/recognized_license_plate",
+    response_model=GenericResponse,
+    dependencies=[Depends(require_role(["admin"]))],
+)
+def set_plate(
+    request: Request,
+    event_id: str,
+    body: EventsLPRBody,
+):
+    try:
+        event: Event = Event.get(Event.id == event_id)
+    except DoesNotExist:
+        event = None
+
+    if request.app.detected_frames_processor:
+        tracked_obj: TrackedObject = None
+
+        for state in request.app.detected_frames_processor.camera_states.values():
+            tracked_obj = state.tracked_objects.get(event_id)
+
+            if tracked_obj is not None:
+                break
+    else:
+        tracked_obj = None
+
+    if not event and not tracked_obj:
+        return JSONResponse(
+            content=(
+                {"success": False, "message": "Event " + event_id + " not found."}
+            ),
+            status_code=404,
+        )
+
+    new_plate = body.recognizedLicensePlate
+    new_score = body.recognizedLicensePlateScore
+
+    if new_plate == "":
+        new_plate = None
+        new_score = None
+
+    request.app.event_metadata_updater.publish(
+        EventMetadataTypeEnum.recognized_license_plate, (event_id, new_plate, new_score)
+    )
+
+    return JSONResponse(
+        content={
+            "success": True,
+            "message": f"Event {event_id} license plate set to {new_plate if new_plate is not None else 'None'}",
+        },
+        status_code=200,
+    )
+
+
 @router.post(
     "/events/{event_id}/description",
     response_model=GenericResponse,