[taler-exchange] 03/03: return signature from refund API

[gnunet]

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grothoff pushed a commit to branch master
in repository exchange.

commit 1b89e8380d843d8f0d48a4ea8ecbae3f6d9039db
Author: Christian Grothoff <address@hidden>
AuthorDate: Fri Apr 10 16:49:54 2020 +0200

    return signature from refund API
---
 src/include/taler_exchange_service.h | 19 +++++++++++--------
 src/lib/exchange_api_refund.c        | 19 +++++++++++++------
 src/testing/testing_api_cmd_refund.c |  4 +++-
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/src/include/taler_exchange_service.h 
b/src/include/taler_exchange_service.h
index 68f0cea3..de7cb1e2 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -850,22 +850,23 @@ struct TALER_EXCHANGE_RefundHandle;
  * @param cls closure
  * @param hr HTTP response data
  * @param sign_key exchange key used to sign @a obj, or NULL
+ * @param signature the actual signature, or NULL on error
  */
 typedef void
 (*TALER_EXCHANGE_RefundCallback) (
   void *cls,
   const struct TALER_EXCHANGE_HttpResponse *hr,
-  const struct TALER_ExchangePublicKeyP *sign_key);
+  const struct TALER_ExchangePublicKeyP *sign_key,
+  const struct TALER_ExchangeSignatureP *signature);
 
 
 /**
- * Submit a refund request to the exchange and get the exchange's
- * response.  This API is used by a merchant.  Note that
- * while we return the response verbatim to the caller for further
- * processing, we do already verify that the response is well-formed
- * (i.e. that signatures included in the response are all valid).  If
- * the exchange's reply is not well-formed, we return an HTTP status code
- * of zero to @a cb.
+ * Submit a refund request to the exchange and get the exchange's response.
+ * This API is used by a merchant.  Note that while we return the response
+ * verbatim to the caller for further processing, we do already verify that
+ * the response is well-formed (i.e. that signatures included in the response
+ * are all valid).  If the exchange's reply is not well-formed, we return an
+ * HTTP status code of zero to @a cb.
  *
  * The @a exchange must be ready to operate (i.e.  have
  * finished processing the /keys reply).  If this check fails, we do
@@ -913,6 +914,8 @@ TALER_EXCHANGE_refund (struct TALER_EXCHANGE_Handle 
*exchange,
  * finished processing the /keys reply).  If this check fails, we do
  * NOT initiate the transaction with the exchange and instead return NULL.
  *
+ * FIXME: We can probably DEPRECATE this API and only use 
#TALER_EXCHANGE_refund()!
+ *
  * @param exchange the exchange handle; the exchange must be ready to operate
  * @param amount the amount to be refunded; must be larger than the refund fee
  *        (as that fee is still being subtracted), and smaller than the amount
diff --git a/src/lib/exchange_api_refund.c b/src/lib/exchange_api_refund.c
index 7ece7eb1..c64dcc97 100644
--- a/src/lib/exchange_api_refund.c
+++ b/src/lib/exchange_api_refund.c
@@ -84,17 +84,19 @@ struct TALER_EXCHANGE_RefundHandle
  * @param rh refund handle
  * @param json json reply with the signature
  * @param[out] exchange_pub set to the exchange's public key
+ * @param[out] exchange_sig set to the exchange's signature
  * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
  */
 static int
 verify_refund_signature_ok (const struct TALER_EXCHANGE_RefundHandle *rh,
                             const json_t *json,
-                            struct TALER_ExchangePublicKeyP *exchange_pub)
+                            struct TALER_ExchangePublicKeyP *exchange_pub,
+                            struct TALER_ExchangeSignatureP *exchange_sig)
+
 {
-  struct TALER_ExchangeSignatureP exchange_sig;
   const struct TALER_EXCHANGE_Keys *key_state;
   struct GNUNET_JSON_Specification spec[] = {
-    GNUNET_JSON_spec_fixed_auto ("sig", &exchange_sig),
+    GNUNET_JSON_spec_fixed_auto ("sig", exchange_sig),
     GNUNET_JSON_spec_fixed_auto ("pub", exchange_pub),
     GNUNET_JSON_spec_end ()
   };
@@ -118,7 +120,7 @@ verify_refund_signature_ok (const struct 
TALER_EXCHANGE_RefundHandle *rh,
   if (GNUNET_OK !=
       GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_REFUND,
                                   &rh->depconf,
-                                  &exchange_sig.eddsa_signature,
+                                  &exchange_sig->eddsa_signature,
                                   &exchange_pub->eddsa_pub))
   {
     GNUNET_break_op (0);
@@ -143,7 +145,9 @@ handle_refund_finished (void *cls,
 {
   struct TALER_EXCHANGE_RefundHandle *rh = cls;
   struct TALER_ExchangePublicKeyP exchange_pub;
+  struct TALER_ExchangeSignatureP exchange_sig;
   struct TALER_ExchangePublicKeyP *ep = NULL;
+  struct TALER_ExchangeSignatureP *es = NULL;
   const json_t *j = response;
   struct TALER_EXCHANGE_HttpResponse hr = {
     .reply = j,
@@ -160,7 +164,8 @@ handle_refund_finished (void *cls,
     if (GNUNET_OK !=
         verify_refund_signature_ok (rh,
                                     j,
-                                    &exchange_pub))
+                                    &exchange_pub,
+                                    &exchange_sig))
     {
       GNUNET_break_op (0);
       hr.http_status = 0;
@@ -169,6 +174,7 @@ handle_refund_finished (void *cls,
     else
     {
       ep = &exchange_pub;
+      es = &exchange_sig;
     }
     break;
   case MHD_HTTP_BAD_REQUEST:
@@ -227,7 +233,8 @@ handle_refund_finished (void *cls,
   }
   rh->cb (rh->cb_cls,
           &hr,
-          ep);
+          ep,
+          es);
   TALER_EXCHANGE_refund_cancel (rh);
 }
 
diff --git a/src/testing/testing_api_cmd_refund.c 
b/src/testing/testing_api_cmd_refund.c
index 7dbcc341..47f5a060 100644
--- a/src/testing/testing_api_cmd_refund.c
+++ b/src/testing/testing_api_cmd_refund.c
@@ -83,11 +83,13 @@ struct RefundState
  * @param hr HTTP response details
  * @param exchange_pub public key the exchange
  *        used for signing @a obj.
+ * @param exchange_sig actual signature confirming the refund
  */
 static void
 refund_cb (void *cls,
            const struct TALER_EXCHANGE_HttpResponse *hr,
-           const struct TALER_ExchangePublicKeyP *exchange_pub)
+           const struct TALER_ExchangePublicKeyP *exchange_pub,
+           const struct TALER_ExchangeSignatureP *exchange_sig)
 {
 
   struct RefundState *rs = cls;

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