[taler-exchange] branch master updated: -finish first implementaation of exchange_api_contracts_get.c

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new b91a4065 -finish first implementaation of exchange_api_contracts_get.c
b91a4065 is described below

commit b91a4065257e1df0a7f6d3f8bc1cbe91a57aac00
Author: Christian Grothoff <grothoff@gnunet.org>
AuthorDate: Mon Apr 11 19:22:30 2022 +0200

    -finish first implementaation of exchange_api_contracts_get.c
---
 src/include/taler_exchange_service.h | 48 +++-------------------------
 src/lib/exchange_api_contracts_get.c | 61 +++++++++++++++++++++++++++---------
 src/util/crypto_contract.c           | 14 +++++++++
 3 files changed, 65 insertions(+), 58 deletions(-)

diff --git a/src/include/taler_exchange_service.h 
b/src/include/taler_exchange_service.h
index e5147322..93f6816c 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -3999,57 +3999,19 @@ struct TALER_EXCHANGE_ContractGetResponse
     {
 
       /**
-       * What is the type of the transaction?
+       * Public key of the purse.
        */
-      enum
-      {
-        /**
-         * This is a request for payment.
-         */
-        TALER_EXCHANGE_CONTRACT_PAYMENT_REQUEST = 0,
-
-        /**
-         * This is a payment, the receiver needs to
-         * accepts the terms.
-         */
-        TALER_EXCHANGE_CONTRACT_PAYMENT_OFFER = 1
-      } type;
+      struct TALER_PurseContractPublicKeyP purse_pub;
 
       /**
-       * Key material, depending on @e type.
+       * Private key of the merge capability.
        */
-      union
-      {
-        /**
-         * Set if @e type is #TALER_EXCHANGE_CONTRACT_PAYMENT_REQUEST.
-         */
-        struct TALER_PurseContractPublicKeyP purse_pub;
-
-        /**
-         * Set if @e type is #TALER_EXCHANGE_CONTRACT_PAYMENT_OFFER.
-         */
-        struct TALER_PurseMergePrivateKeyP merge_priv;
-      } keys;
-
-      /**
-       * Total value of the contract/purse.
-       */
-      struct TALER_Amount amount;
+      struct TALER_PurseMergePrivateKeyP merge_priv;
 
       /**
        * Contract terms.
        */
-      json_t *contract_terms;
-
-      /**
-       * Minimum age required to pay for the contract.
-       */
-      uint8_t min_age;
-
-      /**
-       * When will the purse expire?
-       */
-      struct GNUNET_TIME_Timestamp purse_expiration;
+      const json_t *contract_terms;
 
     } success;
 
diff --git a/src/lib/exchange_api_contracts_get.c 
b/src/lib/exchange_api_contracts_get.c
index 3e7d960a..76ae0052 100644
--- a/src/lib/exchange_api_contracts_get.c
+++ b/src/lib/exchange_api_contracts_get.c
@@ -68,6 +68,11 @@ struct TALER_EXCHANGE_ContractsGetHandle
    */
   struct TALER_ContractDiffiePrivateP contract_priv;
 
+  /**
+   * Public key matching @e contract_priv.
+   */
+  struct TALER_ContractDiffiePublicP cpub;
+
 };
 
 
@@ -101,11 +106,11 @@ handle_contract_get_finished (void *cls,
     {
       void *econtract;
       size_t econtract_size;
-      struct TALER_PurseContractPublicKeyP purse_pub;
+      json_t *contract;
       struct TALER_PurseContractSignatureP econtract_sig;
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_fixed_auto ("purse_pub",
-                                     &purse_pub),
+                                     &dr.details.success.purse_pub),
         GNUNET_JSON_spec_fixed_auto ("econtract_sig",
                                      &econtract_sig),
         GNUNET_JSON_spec_varsize ("econtract",
@@ -124,11 +129,38 @@ handle_contract_get_finished (void *cls,
         dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
         break;
       }
-      // FIXME: verify econtract_sig!
-      // FIXME: decrypt, build up 'dr'!
+      if (GNUNET_OK !=
+          TALER_wallet_econtract_upload_verify (
+            econtract,
+            econtract_size,
+            &cgh->cpub,
+            &dr.details.success.purse_pub,
+            &econtract_sig))
+      {
+        GNUNET_break (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_EXCHANGE_CONTRACTS_SIGNATURE_INVALID;
+        GNUNET_JSON_parse_free (spec);
+        break;
+      }
+      contract = TALER_CRYPTO_contract_decrypt_for_merge (
+        &cgh->contract_priv,
+        &dr.details.success.purse_pub,
+        econtract,
+        econtract_size,
+        &dr.details.success.merge_priv);
+      GNUNET_JSON_parse_free (spec);
+      if (NULL == contract)
+      {
+        GNUNET_break (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_EXCHANGE_CONTRACTS_DECRYPTION_FAILED;
+        break;
+      }
+      dr.details.success.contract_terms = contract;
       cgh->cb (cgh->cb_cls,
                &dr);
-      GNUNET_JSON_parse_free (spec);
+      json_decref (contract);
       TALER_EXCHANGE_contract_get_cancel (cgh);
       return;
     }
@@ -183,8 +215,7 @@ TALER_EXCHANGE_contract_get (
 {
   struct TALER_EXCHANGE_ContractsGetHandle *cgh;
   CURL *eh;
-  struct TALER_ContractDiffiePublicP cpub;
-  char arg_str[sizeof (cpub) * 2 + 48];
+  char arg_str[sizeof (cgh->cpub) * 2 + 48];
 
   if (GNUNET_YES !=
       TEAH_handle_is_ready (exchange))
@@ -192,14 +223,18 @@ TALER_EXCHANGE_contract_get (
     GNUNET_break (0);
     return NULL;
   }
+  cgh = GNUNET_new (struct TALER_EXCHANGE_ContractsGetHandle);
+  cgh->exchange = exchange;
+  cgh->cb = cb;
+  cgh->cb_cls = cb_cls;
   GNUNET_CRYPTO_ecdhe_key_get_public (&contract_priv->ecdhe_priv,
-                                      &cpub.ecdhe_pub);
+                                      &cgh->cpub.ecdhe_pub);
   {
-    char cpub_str[sizeof (cpub) * 2];
+    char cpub_str[sizeof (cgh->cpub) * 2];
     char *end;
 
-    end = GNUNET_STRINGS_data_to_string (&cpub,
-                                         sizeof (cpub),
+    end = GNUNET_STRINGS_data_to_string (&cgh->cpub,
+                                         sizeof (cgh->cpub),
                                          cpub_str,
                                          sizeof (cpub_str));
     *end = '\0';
@@ -209,10 +244,6 @@ TALER_EXCHANGE_contract_get (
                      cpub_str);
   }
 
-  cgh = GNUNET_new (struct TALER_EXCHANGE_ContractsGetHandle);
-  cgh->exchange = exchange;
-  cgh->cb = cb;
-  cgh->cb_cls = cb_cls;
   cgh->url = TEAH_path_to_url (exchange,
                                arg_str);
   if (NULL == cgh->url)
diff --git a/src/util/crypto_contract.c b/src/util/crypto_contract.c
index 026eec31..30fdec78 100644
--- a/src/util/crypto_contract.c
+++ b/src/util/crypto_contract.c
@@ -24,6 +24,20 @@
 #include "taler_exchange_service.h"
 
 
+/**
+ * Different types of contracts supported.
+ */
+enum ContractFormats
+{
+  /**
+   * The encrypted contract represents a payment offer. The receiver
+   * can merge it into a reserve/account to accept the contract and
+   * obtain the payment.
+   */
+  TALER_EXCHANGE_CONTRACT_PAYMENT_OFFER = 0
+};
+
+
 /**
  * Nonce used for encryption, 24 bytes.
  */

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