Added appropriate response on contract-conflict during deposit

In case of a detected conflict during deposit, because
(merchant_pub, h_contract_terms) already existed, with different other
field values, we now provide the client an error response that contains
the h_wire.  This way, the client can retrieve further details about the
conflicting transaction via
/deposits/$H_WIRE/$MERCHANT_PUB/$H_CONTRACT_TERMS/$COIN_PUB

Fixes #8002

1 files changed, 19 insertions, 0 deletions

diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 25d3b17f9..7f7105a01 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -4400,6 +4400,25 @@ struct TALER_EXCHANGEDB_Plugin
 
 
   /**
+   * Try to retrieve the solated hash of the merchant's bank account to a
+   * deposit contract. Used in case of conflicts for a given (merchant_pub,
+   * h_contract_terms) to provide the client the necessary input to retrieve
+   * more details about the conflict.
+   *
+   * @param cls the plugin closure
+   * @param merchant_pub public key of the merchant
+   * @param h_contract_terms contract to check for
+   * @param[out] h_wire hash of the wire details
+   */
+  enum GNUNET_DB_QueryStatus
+    (*get_wire_hash_for_contract)(
+    void *cls,
+    const struct TALER_MerchantPublicKeyP *merchant_pub,
+    const struct TALER_PrivateContractHashP *h_contract_terms,
+    struct TALER_MerchantWireHashP *h_wire);
+
+
+  /**
    * Check if we have the specified deposit already in the database.
    *
    * @param cls the `struct PostgresClosure` with the plugin-specific state