events: Add {RoomRedactionEvent, SyncRoomRedactionEvent}::as_original

crates/ruma-common/src/events/room/redaction.rs

@@ -230,6 +230,14 @@ impl RoomRedactionEvent {
             Self::Redacted(ev) => &ev.room_id,
         }
     }
+
+    /// Get the inner `RoomRedactionEvent` if this is an unredacted event.
+    pub fn as_original(&self) -> Option<&OriginalRoomRedactionEvent> {
+        match self {
+            Self::Original(v) => Some(v),
+            _ => None,
+        }
+    }
 }
 
 impl Redact for RoomRedactionEvent {
@@ -292,6 +300,14 @@ impl SyncRoomRedactionEvent {
         }
     }
 
+    /// Get the inner `SyncRoomRedactionEvent` if this is an unredacted event.
+    pub fn as_original(&self) -> Option<&OriginalSyncRoomRedactionEvent> {
+        match self {
+            Self::Original(v) => Some(v),
+            _ => None,
+        }
+    }
+
     /// Convert this sync event into a full event (one with a `room_id` field).
     pub fn into_full_event(self, room_id: Box<RoomId>) -> RoomRedactionEvent {
         match self {