[taler-merchant] branch master updated: pass on 451 replies from exchange to wallets on /pay

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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 508b748f pass on 451 replies from exchange to wallets on /pay
508b748f is described below

commit 508b748f8e0e4817b04cf57bae0c5f528f3377a6
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Fri Sep 6 09:40:08 2024 +0200

    pass on 451 replies from exchange to wallets on /pay
---
 .../taler-merchant-httpd_post-orders-ID-pay.c      | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/src/backend/taler-merchant-httpd_post-orders-ID-pay.c 
b/src/backend/taler-merchant-httpd_post-orders-ID-pay.c
index 049db1f0..36fa7e7f 100644
--- a/src/backend/taler-merchant-httpd_post-orders-ID-pay.c
+++ b/src/backend/taler-merchant-httpd_post-orders-ID-pay.c
@@ -136,6 +136,12 @@ enum PayPhase
    */
   PP_RETURN_RESPONSE,
 
+  /**
+   * An exchange denied a deposit, fail for
+   * legal reasons.
+   */
+  PP_FAIL_LEGAL_REASONS,
+
   /**
    * Return #MHD_YES to end processing.
    */
@@ -346,6 +352,11 @@ struct ExchangeGroup
    * true if we already tried a forced /keys download.
    */
   bool tried_force_keys;
+
+  /**
+   * Did this exchange deny the transaction for legal reasons?
+   */
+  bool got_451;
 };
 
 
@@ -651,6 +662,10 @@ struct PayContext
    */
   bool refund_currency_mismatch;
 
+  /**
+   * Did any exchange deny a deposit for legal reasons?
+   */
+  bool got_451;
 };
 
 
@@ -809,6 +824,43 @@ phase_return_response (struct PayContext *pc)
 }
 
 
+/**
+ * Return a response indicating failure for legal reasons.
+ *
+ * @param[in,out] pc payment context we are processing
+ */
+static void
+phase_fail_for_legal_reasons (struct PayContext *pc)
+{
+  json_t *exchanges;
+
+  GNUNET_assert (0 == pc->pending);
+  GNUNET_assert (pc->got_451);
+  exchanges = json_array ();
+  GNUNET_assert (NULL != exchanges);
+  for (unsigned int i = 0; i<pc->num_exchanges; i++)
+  {
+    struct ExchangeGroup *eg = pc->egs[i];
+
+    GNUNET_assert (NULL == eg->fo);
+    GNUNET_assert (NULL == eg->bdh);
+    if (! eg->got_451)
+      continue;
+    GNUNET_assert (
+      0 ==
+      json_array_append_new (
+        exchanges,
+        json_string (eg->exchange_url)));
+  }
+  pay_end (pc,
+           TALER_MHD_REPLY_JSON_PACK (
+             pc->connection,
+             MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS,
+             GNUNET_JSON_pack_array_steal ("exchange_base_urls",
+                                           exchanges)));
+}
+
+
 /**
  * Do database transaction for a completed batch deposit.
  *
@@ -1018,6 +1070,27 @@ batch_deposit_cb (
       pay_resume (pc);
     }
     return;
+  case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
+    eg->got_451 = true;
+    pc->got_451 = true;
+    /* update pc->pending */
+    for (size_t i = 0; i<pc->coins_cnt; i++)
+    {
+      struct DepositConfirmation *dc = &pc->dc[i];
+
+      if (0 != strcmp (eg->exchange_url,
+                       pc->dc[i].exchange_url))
+        continue;
+      if (dc->found_in_db)
+        continue;
+      pc->pending--;
+    }
+    if (0 == pc->pending_at_eg)
+    {
+      pc->phase = PP_PAY_TRANSACTION;
+      pay_resume (pc);
+    }
+    return;
   default:
     GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                 "Deposit operation failed with HTTP code %u/%d\n",
@@ -2034,6 +2107,11 @@ phase_execute_pay_transaction (struct PayContext *pc)
   struct TMH_HandlerContext *hc = pc->hc;
   const char *instance_id = hc->instance->settings.id;
 
+  if (pc->got_451)
+  {
+    pc->phase = PP_FAIL_LEGAL_REASONS;
+    return;
+  }
   /* Avoid re-trying transactions on soft errors forever! */
   if (pc->retry_counter++ > MAX_RETRIES)
   {
@@ -3651,6 +3729,9 @@ TMH_post_orders_ID_pay (const struct TMH_RequestHandler 
*rh,
     case PP_RETURN_RESPONSE:
       phase_return_response (pc);
       break;
+    case PP_FAIL_LEGAL_REASONS:
+      phase_fail_for_legal_reasons (pc);
+      break;
     case PP_END_YES:
       return MHD_YES;
     case PP_END_NO:

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