From 0556451225e4990bc2b88c7eb58c65ef531db6aa Mon Sep 17 00:00:00 2001
From: MS <ms@taler.net>
Date: Thu, 10 Jun 2021 15:42:05 +0200
Subject: conflict, when using one reserve pub twice.

---
 talerbank/app/views.py | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/talerbank/app/views.py b/talerbank/app/views.py
index d03faee..ad7b2b4 100644
--- a/talerbank/app/views.py
+++ b/talerbank/app/views.py
@@ -905,19 +905,24 @@ def twg_add_incoming(request, user_account, acct_id):
     debit_account = BankAccount.objects.get(user=debit_user)
     subject = f"{reserve_pub}"
 
-    wtrans = wire_transfer(
-        amount,
-        debit_account,
-        exchange_account,
-        subject,
-    )
+    # check if reserve pub exists already.
+    try:
+        BankTransactions.objects.get(subject=subject)
 
-    return JsonResponse(
-        {
-            "row_id": wtrans.id,
-            "timestamp": dict(t_ms=(int(wtrans.date.timestamp()) * 1000)),
-        }
-    )
+    except BankTransactions.DoesNotExist:
+
+        wtrans = wire_transfer(
+            amount,
+            debit_account,
+            exchange_account,
+        return JsonResponse(
+            {
+                "row_id": wtrans.id,
+                "timestamp": dict(t_ms=(int(wtrans.date.timestamp()) * 1000)),
+            }
+        )
+    # Here means this public key was used already: must fail.
+    return HttpResponse(status=409) # CONFLICT.
 
 
 @csrf_exempt
-- 
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