exchange

commit 0c3f574d65c55e34ddbbdc1576c754fa42c7b464
parent 22d64ba319681fe76d92a3686f3064c8ae788412
Author: Christian Grothoff <christian@grothoff.org>
Date:   Sat,  4 Apr 2026 10:18:07 +0200

return details on conflict with insufficient funds to client

Diffstat:
M
src/include/taler/taler-exchange/post-withdraw_blinded.h
 | 
32
++++++++++++++++++++++++++++++++
M
src/lib/exchange_api_post-withdraw_blinded.c
 | 
26
+++++++++++++++++++++++++-

2 files changed, 57 insertions(+), 1 deletion(-)
diff --git a/src/include/taler/taler-exchange/post-withdraw_blinded.h b/src/include/taler/taler-exchange/post-withdraw_blinded.h
@@ -276,6 +276,38 @@ struct TALER_EXCHANGE_PostWithdrawBlindedResponse
     struct TALER_EXCHANGE_WithdrawCreated created;
 
     /**
+     * Details if the status is #MHD_HTTP_CONFLICT.
+     */
+    struct
+    {
+      /**
+       * Details depending on the EC.
+       */
+      union
+      {
+
+        /**
+         * Further details if the EC is
+         * #TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS.
+         */
+        struct
+        {
+          /**
+           * Balance of the reserve.
+           */
+          struct TALER_Amount balance;
+
+          /**
+           * Amount that was requested.
+           */
+          struct TALER_Amount requested_amount;
+        } generic_insufficient_funds;
+
+      } details;
+
+    } conflict;
+
+    /**
      * Details if the status is #MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS.
      */
     struct TALER_EXCHANGE_KycNeededRedirect unavailable_for_legal_reasons;
diff --git a/src/lib/exchange_api_post-withdraw_blinded.c b/src/lib/exchange_api_post-withdraw_blinded.c
@@ -396,9 +396,33 @@ handle_withdraw_blinded_finished (
     wbr.hr.hint = TALER_JSON_get_error_hint (j_response);
     break;
   case MHD_HTTP_CONFLICT:
-    /* The age requirements might not have been met */
     wbr.hr.ec = TALER_JSON_get_error_code (j_response);
     wbr.hr.hint = TALER_JSON_get_error_hint (j_response);
+    if (TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS ==
+        wbr.hr.ec)
+    {
+      struct GNUNET_JSON_Specification spec[] = {
+        TALER_JSON_spec_amount_any (
+          "balance",
+          &wbr.details.conflict.details.generic_insufficient_funds.balance),
+        TALER_JSON_spec_amount_any (
+          "requested_amount",
+          &wbr.details.conflict.details.generic_insufficient_funds.
+          requested_amount),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (j_response,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        wbr.hr.http_status = 0;
+        wbr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+        break;
+      }
+    }
     break;
   case MHD_HTTP_GONE:
     /* could happen if denomination was revoked */