Revert "check for duplicate transaction ID"

Fixes issue #4519.  "/contract" is needed for contract restoration, even
after a contract has been payed for.

This reverts commit d7eb23ad965c0207e561261588cbf742f93df935.

3 files changed, 0 insertions, 27 deletions

diff --git a/src/backend/taler-merchant-httpd_contract.c b/src/backend/taler-merchant-httpd_contract.c
index af18ce11..1f55ada9 100644
--- a/src/backend/taler-merchant-httpd_contract.c
+++ b/src/backend/taler-merchant-httpd_contract.c
@@ -187,29 +187,6 @@ MH_handler_contract (struct TMH_RequestHandler *rh,
                                               "products in contract request malformed");
   }
 
-  /* Check if this transaction ID erroneously corresponds to a
-     contract that already paid, in which case we should refuse
-     to sign it again (frontend buggy, it should use a fresh
-     transaction ID each time)! */
-  if (GNUNET_OK ==
-      db->check_payment (db->cls,
-                         transaction_id))
-  {
-    struct MHD_Response *resp;
-    int ret;
-
-    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-                "Transaction %llu already paid in the past, refusing to sign!\n",
-                (unsigned long long) transaction_id);
-    resp = MHD_create_response_from_buffer (strlen ("Duplicate transaction ID!"),
-                                            "Duplicate transaction ID!",
-                                            MHD_RESPMEM_PERSISTENT);
-    ret = MHD_queue_response (connection,
-                              MHD_HTTP_FORBIDDEN,
-                              resp);
-    MHD_destroy_response (resp);
-    return ret;
-  }
 
   /* add fields to the contract that the backend should provide */
   json_object_set (jcontract,
diff --git a/src/backend/taler-merchant-httpd_pay.c b/src/backend/taler-merchant-httpd_pay.c
index 4ba5081f..e362c3c9 100644
--- a/src/backend/taler-merchant-httpd_pay.c
+++ b/src/backend/taler-merchant-httpd_pay.c
@@ -882,9 +882,6 @@ MH_handler_pay (struct TMH_RequestHandler *rh,
 
     /* Payment succeeded in the past; take short cut
        and accept immediately */
-    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-                "Transaction %llu already paid in the past, taking short cut.\n",
-                (unsigned long long) pc->transaction_id);
     resp = MHD_create_response_from_buffer (0,
                                             NULL,
                                             MHD_RESPMEM_PERSISTENT);
diff --git a/src/lib/merchant_api_contract.c b/src/lib/merchant_api_contract.c
index c556cc30..1938afa6 100644
--- a/src/lib/merchant_api_contract.c
+++ b/src/lib/merchant_api_contract.c
@@ -123,7 +123,6 @@ handle_contract_finished (void *cls,
        (or API version conflict); just pass JSON reply to the application */
     break;
   case MHD_HTTP_FORBIDDEN:
-    /* Duplicate transaction ID, frontend is buggy! */
     break;
   case MHD_HTTP_UNAUTHORIZED:
     /* Nothing really to verify, merchant says one of the signatures is