[taler-merchant] branch master updated: refuse refunds categorically if refund_delay was 0, instead of trying to give refunds anyway

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grothoff pushed a commit to branch master
in repository merchant.

The following commit(s) were added to refs/heads/master by this push:
     new 7d81706  refuse refunds categorically if refund_delay was 0, instead 
of trying to give refunds anyway
7d81706 is described below

commit 7d81706ca0d905a2d7e8c7c18a6e2d48d0a67bae
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Wed Oct 7 12:40:07 2020 +0200

    refuse refunds categorically if refund_delay was 0, instead of trying to 
give refunds anyway
---
 ...-merchant-httpd_private-post-orders-ID-refund.c | 96 ++++++++++++++++------
 .../taler-merchant-httpd_private-post-orders.c     | 46 ++++++-----
 2 files changed, 97 insertions(+), 45 deletions(-)

diff --git a/src/backend/taler-merchant-httpd_private-post-orders-ID-refund.c 
b/src/backend/taler-merchant-httpd_private-post-orders-ID-refund.c
index 859603b..7af1487 100644
--- a/src/backend/taler-merchant-httpd_private-post-orders-ID-refund.c
+++ b/src/backend/taler-merchant-httpd_private-post-orders-ID-refund.c
@@ -115,6 +115,70 @@ TMH_private_post_orders_ID_refund (const struct 
TMH_RequestHandler *rh,
   enum TALER_MERCHANTDB_RefundStatus rs;
   struct GNUNET_HashCode h_contract;
 
+  {
+    enum GNUNET_DB_QueryStatus qs;
+    json_t *contract_terms;
+    uint64_t order_serial;
+    struct GNUNET_TIME_Absolute refund_deadline;
+    struct GNUNET_TIME_Absolute timestamp;
+    
+    qs = TMH_db->lookup_contract_terms (TMH_db->cls,
+                                        hc->instance->settings.id,
+                                        hc->infix,
+                                        &contract_terms,
+                                        &order_serial);
+    if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
+    {
+      struct GNUNET_JSON_Specification spec[] = {
+                                                 TALER_JSON_spec_absolute_time 
("refund_deadline",
+                                                                               
 &refund_deadline),
+                                                 TALER_JSON_spec_absolute_time 
("timestamp",
+                                                                               
 &timestamp),
+                                                 GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_YES !=
+          GNUNET_JSON_parse (contract_terms,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break (0);
+        GNUNET_JSON_parse_free (spec);
+        json_decref (contract_terms);
+        return TALER_MHD_reply_with_error (connection,
+                                           MHD_HTTP_INTERNAL_SERVER_ERROR,
+                                           TALER_EC_INTERNAL_LOGIC_ERROR,
+                                           "Failed to parse contract terms 
from DB");
+      }
+      json_decref (contract_terms);
+      if (timestamp.abs_value_us == refund_deadline.abs_value_us)
+      {
+        /* refund was never allowed, so we should refuse hard */
+        return TALER_MHD_reply_with_error (connection,
+                                           MHD_HTTP_FORBIDDEN,
+#ifndef TALER_EC_MERCHANT_REFUND_NOT_ALLOWED_BY_CONTRACT
+                                           2609, /* remove post 0.8.0 release 
*/
+#else
+                                           
TALER_EC_MERCHANT_REFUND_NOT_ALLOWED_BY_CONTRACT,
+#endif
+                                           NULL);
+      }
+      if (0 == GNUNET_TIME_absolute_get_remaining 
(refund_deadline).rel_value_us)
+      {
+        /* it is too late for refunds */
+        /* NOTE: We MAY still be lucky that the exchange did not yet
+           wire the funds, so we will try to give the refund anyway */
+      }
+    }
+    else
+    {
+      return TALER_MHD_reply_with_error (connection,
+                                         MHD_HTTP_NOT_FOUND,
+                                         TALER_EC_REFUND_ORDER_ID_UNKNOWN,
+                                         hc->infix);
+    }
+  }
+  
   {
     enum GNUNET_GenericReturnValue res;
 
@@ -187,30 +251,14 @@ TMH_private_post_orders_ID_refund (const struct 
TMH_RequestHandler *rh,
                                        NULL);
   case TALER_MERCHANTDB_RS_NO_SUCH_ORDER:
     {
-      enum GNUNET_DB_QueryStatus qs;
-      json_t *contract_terms;
-      uint64_t order_serial;
-
-      qs = TMH_db->lookup_contract_terms (TMH_db->cls,
-                                          hc->instance->settings.id,
-                                          hc->infix,
-                                          &contract_terms,
-                                          &order_serial);
-      if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
-      {
-        json_decref (contract_terms);
-        return TALER_MHD_reply_with_error (connection,
-                                           MHD_HTTP_CONFLICT,
-                                           TALER_EC_REFUND_ORDER_ID_UNPAID,
-                                           hc->infix);
-      }
-      else
-      {
-        return TALER_MHD_reply_with_error (connection,
-                                           MHD_HTTP_NOT_FOUND,
-                                           TALER_EC_REFUND_ORDER_ID_UNKNOWN,
-                                           hc->infix);
-      }
+      /* We know the order exists from the 
+         "lookup_contract_terms" at the beginning;
+         so if we get 'no such order' here, it 
+         must be read as "no PAID order" */
+      return TALER_MHD_reply_with_error (connection,
+                                         MHD_HTTP_CONFLICT,
+                                         TALER_EC_REFUND_ORDER_ID_UNPAID,
+                                         hc->infix);
     }
   case TALER_MERCHANTDB_RS_SUCCESS:
     {
diff --git a/src/backend/taler-merchant-httpd_private-post-orders.c 
b/src/backend/taler-merchant-httpd_private-post-orders.c
index 0b3bf50..7fc4032 100644
--- a/src/backend/taler-merchant-httpd_private-post-orders.c
+++ b/src/backend/taler-merchant-httpd_private-post-orders.c
@@ -673,31 +673,35 @@ patch_order (struct MHD_Connection *connection,
     }
   }
 
-  /* Add timestamp if it doesn't exist */
-  if (NULL == json_object_get (order,
-                               "timestamp"))
   {
     struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
-
     (void) GNUNET_TIME_round_abs (&now);
-    GNUNET_assert (0 ==
-                   json_object_set_new (order,
-                                        "timestamp",
-                                        GNUNET_JSON_from_time_abs (now)));
-  }
-
-  /* If no refund_deadline given, set one based on refund_delay.  */
-  if (NULL == json_object_get (order,
-                               "refund_deadline"))
-  {
-    struct GNUNET_TIME_Absolute rd =
-      GNUNET_TIME_relative_to_absolute (refund_delay);
 
-    (void) GNUNET_TIME_round_abs (&rd);
-    GNUNET_assert (0 ==
-                   json_object_set_new (order,
-                                        "refund_deadline",
-                                        GNUNET_JSON_from_time_abs (rd)));
+    /* Add timestamp if it doesn't exist */
+    if (NULL == json_object_get (order,
+                                 "timestamp"))
+    {
+      GNUNET_assert (0 ==
+                     json_object_set_new (order,
+                                          "timestamp",
+                                          GNUNET_JSON_from_time_abs (now)));
+    }
+    
+    /* If no refund_deadline given, set one based on refund_delay.  */
+    if (NULL == json_object_get (order,
+                                 "refund_deadline"))
+    {
+      struct GNUNET_TIME_Absolute rd =
+        GNUNET_TIME_relative_to_absolute (refund_delay);
+      
+      (void) GNUNET_TIME_round_abs (&rd);
+      if (0 == refund_delay.rel_value_us)
+        rd = now; /* if delay was 0, ensure that refund_deadline == timestamp 
*/
+      GNUNET_assert (0 ==
+                     json_object_set_new (order,
+                                          "refund_deadline",
+                                          GNUNET_JSON_from_time_abs (rd)));
+    }
   }
 
   if (NULL == json_object_get (order,

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