From 79c0d4adf09ac76302035e178d86c83dbe27097a Mon Sep 17 00:00:00 2001
From: Christian Grothoff <grothoff@gnunet.org>
Date: Thu, 9 Nov 2023 16:30:23 +0100
Subject: work on supporting recoup in coin history

---
 src/testing/testing_api_cmd_coin_history.c |  5 ++---
 src/testing/testing_api_cmd_recoup.c       | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/src/testing/testing_api_cmd_coin_history.c b/src/testing/testing_api_cmd_coin_history.c
index 38905b353..703465ab0 100644
--- a/src/testing/testing_api_cmd_coin_history.c
+++ b/src/testing/testing_api_cmd_coin_history.c
@@ -148,9 +148,8 @@ history_entry_cmp (
     if (0 != GNUNET_memcmp (&h1->details.recoup.coin_sig,
                             &h2->details.recoup.coin_sig))
       return 1;
-    if (0 != GNUNET_memcmp (&h1->details.recoup.exchange_sig,
-                            &h2->details.recoup.exchange_sig))
-      return 1;
+    /* Note: exchange_sig, exchange_pub and timestamp are
+       fundamentally not available in the initiating command */
     return 0;
   case TALER_EXCHANGE_CTT_RECOUP_REFRESH:
     if (0 != GNUNET_memcmp (&h1->details.recoup_refresh.coin_sig,
diff --git a/src/testing/testing_api_cmd_recoup.c b/src/testing/testing_api_cmd_recoup.c
index c4e72333e..cefcd96bb 100644
--- a/src/testing/testing_api_cmd_recoup.c
+++ b/src/testing/testing_api_cmd_recoup.c
@@ -58,6 +58,16 @@ struct RecoupState
    */
   struct TALER_ReservePublicKeyP reserve_pub;
 
+  /**
+   * Entry in the coin's history generated by this operation.
+   */
+  struct TALER_EXCHANGE_CoinHistoryEntry che;
+
+  /**
+   * Public key of the refunded coin.
+   */
+  struct TALER_CoinSpendPublicKeyP coin;
+
   /**
    * Reserve history entry, set if this recoup actually filled up a reserve.
    * Otherwise `reserve_history.type` will be zero.
@@ -145,6 +155,7 @@ recoup_cb (void *cls,
           TALER_amount_is_valid (&ps->reserve_history.amount))
         ps->reserve_history.type = TALER_EXCHANGE_RTT_RECOUP;
       /* ps->reserve_history.details.recoup_details.coin_pub; // initialized earlier */
+      ps->che.details.recoup.reserve_pub = ps->reserve_pub;
     }
     break;
   case MHD_HTTP_NOT_FOUND:
@@ -183,6 +194,7 @@ recoup_run (void *cls,
   char *cref;
   unsigned int idx;
   const struct TALER_ExchangeWithdrawValues *ewv;
+  struct TALER_DenominationHashP h_denom_pub;
 
   ps->is = is;
   if (GNUNET_OK !=
@@ -214,6 +226,8 @@ recoup_run (void *cls,
     TALER_TESTING_interpreter_fail (is);
     return;
   }
+  GNUNET_CRYPTO_eddsa_key_get_public (&coin_priv->eddsa_priv,
+                                      &ps->coin.eddsa_pub);
   if (GNUNET_OK !=
       TALER_TESTING_get_trait_exchange_wd_value (coin_cmd,
                                                  idx,
@@ -256,6 +270,17 @@ recoup_run (void *cls,
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "Trying to recoup denomination '%s'\n",
               TALER_B2S (&denom_pub->h_key));
+  ps->che.type = TALER_EXCHANGE_CTT_RECOUP;
+  ps->che.amount = ps->reserve_history.amount;
+  TALER_planchet_blinding_secret_create (planchet,
+                                         ewv,
+                                         &ps->che.details.recoup.coin_bks);
+  TALER_denom_pub_hash (&denom_pub->key,
+                        &h_denom_pub);
+  TALER_wallet_recoup_sign (&h_denom_pub,
+                            &ps->che.details.recoup.coin_bks,
+                            coin_priv,
+                            &ps->che.details.recoup.coin_sig);
   ps->ph = TALER_EXCHANGE_recoup (
     TALER_TESTING_interpreter_get_context (is),
     TALER_TESTING_get_exchange_url (is),
@@ -316,6 +341,10 @@ recoup_traits (void *cls,
       TALER_TESTING_make_trait_reserve_pub (&ps->reserve_pub),
       TALER_TESTING_make_trait_reserve_history (0,
                                                 &ps->reserve_history),
+      TALER_TESTING_make_trait_coin_history (0,
+                                             &ps->che),
+      TALER_TESTING_make_trait_coin_pub (0,
+                                         &ps->coin),
       TALER_TESTING_trait_end ()
     };
 
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