-refactor DB for reserve history/status routines

contrib/gana

@@ -1 +1 @@
-Subproject commit affa835c8ee4789134bdb5b49928dd3788d847da
+Subproject commit 9657bf77de05c0ac17ff39629306a604066b21de

src/exchange/taler-exchange-httpd_responses.c

@@ -425,6 +425,62 @@ TEH_RESPONSE_compile_transaction_history (
         break;
       }
 
+    case TALER_EXCHANGEDB_TT_PURSE_REFUND:
+      {
+        const struct TALER_EXCHANGEDB_PurseRefundListEntry *prefund =
+          pos->details.purse_refund;
+        struct TALER_Amount value;
+        enum TALER_ErrorCode ec;
+        struct TALER_ExchangePublicKeyP epub;
+        struct TALER_ExchangeSignatureP esig;
+
+        if (0 >
+            TALER_amount_subtract (&value,
+                                   &prefund->refund_amount,
+                                   &prefund->refund_fee))
+        {
+          GNUNET_break (0);
+          json_decref (history);
+          return NULL;
+        }
+        ec = TALER_exchange_online_purse_refund_sign (
+          &TEH_keys_exchange_sign_,
+          &value,
+          &prefund->refund_fee,
+          coin_pub,
+          &prefund->purse_pub,
+          &epub,
+          &esig);
+        if (TALER_EC_NONE != ec)
+        {
+          GNUNET_break (0);
+          json_decref (history);
+          return NULL;
+        }
+        if (0 !=
+            json_array_append_new (
+              history,
+              GNUNET_JSON_PACK (
+                GNUNET_JSON_pack_string ("type",
+                                         "PURSE-REFUND"),
+                TALER_JSON_pack_amount ("amount",
+                                        &value),
+                TALER_JSON_pack_amount ("refund_fee",
+                                        &prefund->refund_fee),
+                GNUNET_JSON_pack_data_auto ("exchange_sig",
+                                            &esig),
+                GNUNET_JSON_pack_data_auto ("exchange_pub",
+                                            &epub),
+                GNUNET_JSON_pack_data_auto ("purse_pub",
+                                            &prefund->purse_pub))))
+        {
+          GNUNET_break (0);
+          json_decref (history);
+          return NULL;
+        }
+      }
+      break;
+
     case TALER_EXCHANGEDB_TT_RESERVE_OPEN:
       {
         struct TALER_EXCHANGEDB_ReserveOpenListEntry *role

src/exchangedb/Makefile.am

@@ -73,6 +73,7 @@ libtaler_plugin_exchangedb_postgres_la_SOURCES = \
   pg_do_reserve_open.c pg_do_reserve_open.h \
   pg_get_coin_transactions.c pg_get_coin_transactions.h \
   pg_get_expired_reserves.c pg_get_expired_reserves.h \
+  pg_get_reserve_history.c pg_get_reserve_history.h \
   pg_get_unfinished_close_requests.c pg_get_unfinished_close_requests.h \
   pg_insert_close_request.c pg_insert_close_request.h \
   pg_insert_records_by_table.c pg_insert_records_by_table.h \

src/exchangedb/pg_get_reserve_history.h

@@ -0,0 +1,67 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2022 Taler Systems SA
+
+   TALER is free software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the Free Software
+   Foundation; either version 3, or (at your option) any later version.
+
+   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along with
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file pg_get_reserve_history.h
+ * @brief implementation of the get_reserve_history function
+ * @author Christian Grothoff
+ */
+#ifndef PG_GET_RESERVE_HISTORY_H
+#define PG_GET_RESERVE_HISTORY_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+
+
+/**
+ * Get all of the transaction history associated with the specified
+ * reserve.
+ *
+ * @param cls the `struct PostgresClosure` with the plugin-specific state
+ * @param reserve_pub public key of the reserve
+ * @param[out] balance set to the reserve balance
+ * @param[out] rhp set to known transaction history (NULL if reserve is unknown)
+ * @return transaction status
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_get_reserve_history (void *cls,
+                            const struct TALER_ReservePublicKeyP *reserve_pub,
+                            struct TALER_Amount *balance,
+                            struct TALER_EXCHANGEDB_ReserveHistory **rhp);
+
+
+/**
+ * Get a truncated transaction history associated with the specified
+ * reserve.
+ *
+ * @param cls the `struct PostgresClosure` with the plugin-specific state
+ * @param reserve_pub public key of the reserve
+ * @param[out] balance_in set to the total of inbound
+ *             transactions in the returned history
+ * @param[out] balance_out set to the total of outbound
+ *             transactions in the returned history
+ * @param[out] rhp set to known transaction history (NULL if reserve is unknown)
+ * @return transaction status
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_get_reserve_status (void *cls,
+                           const struct TALER_ReservePublicKeyP *reserve_pub,
+                           struct TALER_Amount *balance_in,
+                           struct TALER_Amount *balance_out,
+                           struct TALER_EXCHANGEDB_ReserveHistory **rhp);
+
+
+#endif

src/exchangedb/plugin_exchangedb_common.c

@@ -85,6 +85,22 @@ TEH_COMMON_free_reserve_history (
         GNUNET_free (history);
         break;
       }
+    case TALER_EXCHANGEDB_RO_OPEN_REQUEST:
+      {
+        struct TALER_EXCHANGEDB_OpenRequest *or;
+
+        or = rh->details.open_request;
+        GNUNET_free (or);
+        break;
+      }
+    case TALER_EXCHANGEDB_RO_CLOSE_REQUEST:
+      {
+        struct TALER_EXCHANGEDB_CloseRequest *cr;
+
+        cr = rh->details.close_request;
+        GNUNET_free (cr);
+        break;
+      }
     }
     {
       struct TALER_EXCHANGEDB_ReserveHistory *next;

src/include/taler_crypto_lib.h

@@ -3834,6 +3834,51 @@ TALER_exchange_online_melt_confirmation_verify (
   const struct TALER_ExchangeSignatureP *sig);
 
 
+/**
+ * Create exchange purse refund confirmation signature.
+ *
+ * @param scb function to call to create the signature
+ * @param amount_without_fee refunded amount
+ * @param refund_fee refund fee charged
+ * @param coin_pub coin that was refunded
+ * @param purse_pub public key of the expired purse
+ * @param[out] pub where to write the public key
+ * @param[out] sig where to write the signature
+ * @return #TALER_EC_NONE on success
+ */
+enum TALER_ErrorCode
+TALER_exchange_online_purse_refund_sign (
+  TALER_ExchangeSignCallback scb,
+  const struct TALER_Amount *amount_without_fee,
+  const struct TALER_Amount *refund_fee,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  struct TALER_ExchangePublicKeyP *pub,
+  struct TALER_ExchangeSignatureP *sig);
+
+
+/**
+ * Verify signature of exchange affirming purse refund
+ * from purse expiration.
+ *
+ * @param amount_without_fee refunded amount
+ * @param refund_fee refund fee charged
+ * @param coin_pub coin that was refunded
+ * @param purse_pub public key of the expired purse
+ * @param pub public key to verify signature against
+ * @param sig signature to verify
+ * @return #GNUNET_OK if the signature is valid
+ */
+enum GNUNET_GenericReturnValue
+TALER_exchange_online_purse_refund_verify (
+  const struct TALER_Amount *amount_without_fee,
+  const struct TALER_Amount *refund_fee,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  const struct TALER_ExchangePublicKeyP *pub,
+  const struct TALER_ExchangeSignatureP *sig);
+
+
 /**
  * Create exchange key set signature.
  *
@@ -3860,8 +3905,8 @@ TALER_exchange_online_key_set_sign (
  *
  * @param timestamp time when the key set was issued
  * @param hc hash over all the keys
- * @param pub where to write the public key
+ * @param pub public key to verify signature against
- * @param sig where to write the signature
+ * @param sig signature to verify
  * @return #GNUNET_OK if the signature is valid
  */
 enum GNUNET_GenericReturnValue

src/include/taler_exchangedb_plugin.h

@@ -1270,6 +1270,75 @@ struct TALER_EXCHANGEDB_HistoryRequest
 };
 
 
+/**
+ * Details about a (paid for) reserve open request.
+ */
+struct TALER_EXCHANGEDB_OpenRequest
+{
+  /**
+   * Public key of the reserve the open request was for.
+   */
+  struct TALER_ReservePublicKeyP reserve_pub;
+
+  /**
+   * Fee paid for the request from the reserve.
+   */
+  struct TALER_Amount open_fee;
+
+  /**
+   * When was the request made.
+   */
+  struct GNUNET_TIME_Timestamp request_timestamp;
+
+  /**
+   * How long was the reserve supposed to be open.
+   */
+  struct GNUNET_TIME_Timestamp reserve_expiration;
+
+  /**
+   * Signature by the reserve approving the open request.
+   */
+  struct TALER_ReserveSignatureP reserve_sig;
+
+  /**
+   * How many open purses should be included with the
+   * open reserve?
+   */
+  uint32_t purse_limit;
+
+};
+
+
+/**
+ * Details about an (explicit) reserve close request.
+ */
+struct TALER_EXCHANGEDB_CloseRequest
+{
+  /**
+   * Public key of the reserve the history request was for.
+   */
+  struct TALER_ReservePublicKeyP reserve_pub;
+
+  /**
+   * When was the request made.
+   */
+  struct GNUNET_TIME_Timestamp request_timestamp;
+
+  /**
+   * Hash of the payto://-URI of the target account
+   * for the closure, or all zeros for the reserve
+   * origin account.
+   */
+  struct TALER_PaytoHashP target_account_h_payto;
+
+  /**
+   * Signature by the reserve approving the history request.
+   */
+  struct TALER_ReserveSignatureP reserve_sig;
+
+};
+
+
 /**
  * @brief Types of operations on a reserve.
  */
@@ -1306,7 +1375,17 @@ enum TALER_EXCHANGEDB_ReserveOperation
   /**
    * Event where a wallet paid for a full reserve history.
    */
-  TALER_EXCHANGEDB_RO_HISTORY_REQUEST = 5
+  TALER_EXCHANGEDB_RO_HISTORY_REQUEST = 5,
+
+  /**
+   * Event where a wallet paid to open a reserve for longer.
+   */
+  TALER_EXCHANGEDB_RO_OPEN_REQUEST = 6,
+
+  /**
+   * Event where a wallet requested a reserve to be closed.
+   */
+  TALER_EXCHANGEDB_RO_CLOSE_REQUEST = 7
 };
 
 
@@ -1367,6 +1446,16 @@ struct TALER_EXCHANGEDB_ReserveHistory
      */
     struct TALER_EXCHANGEDB_HistoryRequest *history;
 
+    /**
+     * Details about a (paid for) open reserve request.
+     */
+    struct TALER_EXCHANGEDB_OpenRequest *open_request;
+
+    /**
+     * Details about an (explicit) reserve close request.
+     */
+    struct TALER_EXCHANGEDB_CloseRequest *close_request;
+
   } details;
 
 };

src/util/exchange_signatures.c

@@ -1379,6 +1379,100 @@ TALER_exchange_online_purse_created_verify (
 }
 
 
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Response by which the exchange affirms that it has
+ * received funds deposited into a purse.
+ */
+struct TALER_CoinPurseRefundConfirmationPS
+{
+
+  /**
+   * Purpose is #TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_REFUND
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+  /**
+   * Public key of the purse.
+   */
+  struct TALER_PurseContractPublicKeyP purse_pub;
+
+  /**
+   * Public key of the coin.
+   */
+  struct TALER_CoinSpendPublicKeyP coin_pub;
+
+  /**
+   * How much will be refunded to the purse.
+   */
+  struct TALER_AmountNBO refunded_amount;
+
+  /**
+   * How much was the refund fee.
+   */
+  struct TALER_AmountNBO refund_fee;
+
+};
+
+GNUNET_NETWORK_STRUCT_END
+
+
+enum TALER_ErrorCode
+TALER_exchange_online_purse_refund_sign (
+  TALER_ExchangeSignCallback scb,
+  const struct TALER_Amount *amount_without_fee,
+  const struct TALER_Amount *refund_fee,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  struct TALER_ExchangePublicKeyP *pub,
+  struct TALER_ExchangeSignatureP *sig)
+{
+  struct TALER_CoinPurseRefundConfirmationPS dc = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_REFUND),
+    .purpose.size = htonl (sizeof (dc)),
+    .coin_pub = *coin_pub,
+    .purse_pub = *purse_pub,
+  };
+
+  TALER_amount_hton (&dc.refunded_amount,
+                     amount_without_fee);
+  TALER_amount_hton (&dc.refund_fee,
+                     refund_fee);
+  return scb (&dc.purpose,
+              pub,
+              sig);
+}
+
+
+enum GNUNET_GenericReturnValue
+TALER_exchange_online_purse_refund_verify (
+  const struct TALER_Amount *amount_without_fee,
+  const struct TALER_Amount *refund_fee,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_PurseContractPublicKeyP *purse_pub,
+  const struct TALER_ExchangePublicKeyP *pub,
+  const struct TALER_ExchangeSignatureP *sig)
+{
+  struct TALER_CoinPurseRefundConfirmationPS dc = {
+    .purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_REFUND),
+    .purpose.size = htonl (sizeof (dc)),
+    .coin_pub = *coin_pub,
+    .purse_pub = *purse_pub,
+  };
+
+  TALER_amount_hton (&dc.refunded_amount,
+                     amount_without_fee);
+  TALER_amount_hton (&dc.refund_fee,
+                     refund_fee);
+  return
+    GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_REFUND,
+                                &dc,
+                                &sig->eddsa_signature,
+                                &pub->eddsa_pub);
+}
+
+
 GNUNET_NETWORK_STRUCT_BEGIN
 
 /**