From e3f7b5b79bf09a16672b5b08a742389370b2bded Mon Sep 17 00:00:00 2001
From: tecnovert <tecnovert@tecnovert.net>
Date: Sun, 12 Jan 2025 22:23:20 +0200
Subject: [PATCH] Constrain swap state when processing reversed bid accept
 message.

---
 basicswap/basicswap.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/basicswap/basicswap.py b/basicswap/basicswap.py
index 756ce04..dfb7d94 100644
--- a/basicswap/basicswap.py
+++ b/basicswap/basicswap.py
@@ -9548,6 +9548,16 @@ class BasicSwap(BaseApp):
         ensure(msg["to"] == bid.bid_addr, "Received on incorrect address")
         ensure(msg["from"] == offer.addr_from, "Sent from incorrect address")
 
+        allowed_states = [
+            BidStates.BID_REQUEST_SENT,
+        ]
+        if bid.was_sent and offer.was_sent:
+            allowed_states.append(BidStates.BID_REQUEST_ACCEPTED)
+        ensure(
+            bid.state in allowed_states,
+            "Invalid state for bid {}".format(bid.state),
+        )
+
         ci_from = self.ci(offer.coin_to)
         ci_to = self.ci(offer.coin_from)