[taler-exchange] branch master updated: work on global fee structure

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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 5fa977cc work on global fee structure
5fa977cc is described below

commit 5fa977cc05daca469044711ffb6a497287094c70
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sat Mar 5 15:13:07 2022 +0100

    work on global fee structure
---
 src/exchangedb/exchange-0001.sql |  8 ++++++++
 src/include/taler_crypto_lib.h   | 40 ++++++++++++++++++++++++++++++++++++++++
 src/include/taler_signatures.h   | 32 ++++++++++++++++++++++++++++++++
 src/util/offline_signatures.c    | 18 +++++++++++++++++-
 src/util/util.c                  | 16 ++++++++++++++++
 5 files changed, 113 insertions(+), 1 deletion(-)

diff --git a/src/exchangedb/exchange-0001.sql b/src/exchangedb/exchange-0001.sql
index a3996d12..58a6b728 100644
--- a/src/exchangedb/exchange-0001.sql
+++ b/src/exchangedb/exchange-0001.sql
@@ -858,6 +858,14 @@ CREATE TABLE IF NOT EXISTS global_fee
   ,history_fee_frac INT4 NOT NULL
   ,kyc_fee_val INT8 NOT NULL
   ,kyc_fee_frac INT4 NOT NULL
+  ,account_fee_val INT8 NOT NULL
+  ,account_fee_frac INT4 NOT NULL
+  ,purse_fee_val INT8 NOT NULL
+  ,purse_fee_frac INT4 NOT NULL
+  ,purse_timeout INT8 NOT NULL
+  ,kyc_timeout INT8 NOT NULL
+  ,history_expiration INT8 NOT NULL
+  ,purse_account_limit INT4 NOT NULL
   ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
   ,PRIMARY KEY (start_date)
   );
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 40f407b6..5f091e77 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -695,6 +695,18 @@ struct TALER_GlobalFeeSetNBOP
    */
   struct TALER_AmountNBO kyc;
 
+  /**
+   * The fee the exchange charges for keeping
+   * an account or reserve open for a year.
+   */
+  struct TALER_AmountNBO account;
+
+  /**
+   * The fee the exchange charges if a purse
+   * is abandoned and this was not covered by
+   * the account limit.
+   */
+  struct TALER_AmountNBO purse;
 };
 
 
@@ -783,6 +795,18 @@ struct TALER_GlobalFeeSet
    */
   struct TALER_Amount kyc;
 
+  /**
+   * The fee the exchange charges for keeping
+   * an account or reserve open for a year.
+   */
+  struct TALER_Amount account;
+
+  /**
+   * The fee the exchange charges if a purse
+   * is abandoned and this was not covered by
+   * the account limit.
+   */
+  struct TALER_Amount purse;
 };
 
 
@@ -3296,6 +3320,10 @@ TALER_exchange_offline_wire_fee_verify (
  * @param start_time when do the fees start to apply
  * @param end_time when do the fees start to apply
  * @param fees the global fees
+ * @param purse_timeout how long do unmerged purses stay around
+ * @param kyc_timeout how long do we keep funds in a reserve without KYC?
+ * @param history_expiration how long do we keep the history of an account
+ * @param purse_account_limit how many concurrent purses are free per account 
holder
  * @param master_priv private key to sign with
  * @param[out] master_sig where to write the signature
  */
@@ -3304,6 +3332,10 @@ TALER_exchange_offline_global_fee_sign (
   struct GNUNET_TIME_Timestamp start_time,
   struct GNUNET_TIME_Timestamp end_time,
   const struct TALER_GlobalFeeSet *fees,
+  struct GNUNET_TIME_Relative purse_timeout,
+  struct GNUNET_TIME_Relative kyc_timeout,
+  struct GNUNET_TIME_Relative history_expiration,
+  uint32_t purse_account_limit,
   const struct TALER_MasterPrivateKeyP *master_priv,
   struct TALER_MasterSignatureP *master_sig);
 
@@ -3314,6 +3346,10 @@ TALER_exchange_offline_global_fee_sign (
  * @param start_time when do the fees start to apply
  * @param end_time when do the fees start to apply
  * @param fees the global fees
+ * @param purse_timeout how long do unmerged purses stay around
+ * @param kyc_timeout how long do we keep funds in a reserve without KYC?
+ * @param history_expiration how long do we keep the history of an account
+ * @param purse_account_limit how many concurrent purses are free per account 
holder
  * @param master_pub public key to verify against
  * @param master_sig the signature the signature
  * @return #GNUNET_OK if the signature is valid
@@ -3323,6 +3359,10 @@ TALER_exchange_offline_global_fee_verify (
   struct GNUNET_TIME_Timestamp start_time,
   struct GNUNET_TIME_Timestamp end_time,
   const struct TALER_GlobalFeeSet *fees,
+  struct GNUNET_TIME_Relative purse_timeout,
+  struct GNUNET_TIME_Relative kyc_timeout,
+  struct GNUNET_TIME_Relative history_expiration,
+  uint32_t purse_account_limit,
   const struct TALER_MasterPublicKeyP *master_pub,
   const struct TALER_MasterSignatureP *master_sig);
 
diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h
index 77a23421..5c5aaeeb 100644
--- a/src/include/taler_signatures.h
+++ b/src/include/taler_signatures.h
@@ -1274,11 +1274,43 @@ struct TALER_MasterGlobalFeePS
    */
   struct GNUNET_TIME_TimestampNBO end_date;
 
+  /**
+   * How long does an exchange keep a purse around after a purse
+   * has expired (or been successfully merged)?  A 'GET' request
+   * for a purse will succeed until the purse expiration time
+   * plus this value.
+   */
+  struct GNUNET_TIME_RelativeNBO purse_timeout;
+
+  /**
+   * How long does the exchange promise to keep funds
+   * an account for which the KYC has never happened
+   * after a purse was merged into an account? Basically,
+   * after this time funds in an account without KYC are
+   * forfeit.
+   */
+  struct GNUNET_TIME_RelativeNBO kyc_timeout;
+
+  /**
+   * How long will the exchange preserve the account history?  After an
+   * account was deleted/closed, the exchange will retain the account history
+   * for legal reasons until this time.
+   */
+  struct GNUNET_TIME_RelativeNBO history_expiration;
+
   /**
    * Fee charged to the merchant per wire transfer.
    */
   struct TALER_GlobalFeeSetNBOP fees;
 
+  /**
+   * Number of concurrent purses that any
+   * account holder is allowed to create without having
+   * to pay the @e purse_fee. Here given in NBO.
+   */
+  uint32_t purse_account_limit;
+
+
 };
 
 
diff --git a/src/util/offline_signatures.c b/src/util/offline_signatures.c
index 2a358bbf..1085ac15 100644
--- a/src/util/offline_signatures.c
+++ b/src/util/offline_signatures.c
@@ -471,6 +471,10 @@ TALER_exchange_offline_global_fee_sign (
   struct GNUNET_TIME_Timestamp start_time,
   struct GNUNET_TIME_Timestamp end_time,
   const struct TALER_GlobalFeeSet *fees,
+  struct GNUNET_TIME_Relative purse_timeout,
+  struct GNUNET_TIME_Relative kyc_timeout,
+  struct GNUNET_TIME_Relative history_expiration,
+  uint32_t purse_account_limit,
   const struct TALER_MasterPrivateKeyP *master_priv,
   struct TALER_MasterSignatureP *master_sig)
 {
@@ -479,6 +483,10 @@ TALER_exchange_offline_global_fee_sign (
     .purpose.size = htonl (sizeof (kv)),
     .start_date = GNUNET_TIME_timestamp_hton (start_time),
     .end_date = GNUNET_TIME_timestamp_hton (end_time),
+    .purse_timeout = GNUNET_TIME_relative_hton (purse_timeout),
+    .kyc_timeout = GNUNET_TIME_relative_hton (kyc_timeout),
+    .history_expiration = GNUNET_TIME_relative_hton (history_expiration),
+    .purse_account_limit = htonl (purse_account_limit)
   };
 
   TALER_global_fee_set_hton (&kv.fees,
@@ -494,6 +502,10 @@ TALER_exchange_offline_global_fee_verify (
   struct GNUNET_TIME_Timestamp start_time,
   struct GNUNET_TIME_Timestamp end_time,
   const struct TALER_GlobalFeeSet *fees,
+  struct GNUNET_TIME_Relative purse_timeout,
+  struct GNUNET_TIME_Relative kyc_timeout,
+  struct GNUNET_TIME_Relative history_expiration,
+  uint32_t purse_account_limit,
   const struct TALER_MasterPublicKeyP *master_pub,
   const struct TALER_MasterSignatureP *master_sig)
 {
@@ -501,7 +513,11 @@ TALER_exchange_offline_global_fee_verify (
     .purpose.purpose = htonl (TALER_SIGNATURE_MASTER_GLOBAL_FEES),
     .purpose.size = htonl (sizeof (wf)),
     .start_date = GNUNET_TIME_timestamp_hton (start_time),
-    .end_date = GNUNET_TIME_timestamp_hton (end_time)
+    .end_date = GNUNET_TIME_timestamp_hton (end_time),
+    .purse_timeout = GNUNET_TIME_relative_hton (purse_timeout),
+    .kyc_timeout = GNUNET_TIME_relative_hton (kyc_timeout),
+    .history_expiration = GNUNET_TIME_relative_hton (history_expiration),
+    .purse_account_limit = htonl (purse_account_limit)
   };
 
   TALER_global_fee_set_hton (&wf.fees,
diff --git a/src/util/util.c b/src/util/util.c
index 33b0a77c..2d10fd69 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -84,6 +84,10 @@ TALER_global_fee_set_hton (struct TALER_GlobalFeeSetNBOP 
*nbo,
                      &fees->history);
   TALER_amount_hton (&nbo->kyc,
                      &fees->kyc);
+  TALER_amount_hton (&nbo->account,
+                     &fees->account);
+  TALER_amount_hton (&nbo->purse,
+                     &fees->purse);
 }
 
 
@@ -95,6 +99,10 @@ TALER_global_fee_set_ntoh (struct TALER_GlobalFeeSet *fees,
                      &nbo->history);
   TALER_amount_ntoh (&fees->kyc,
                      &nbo->kyc);
+  TALER_amount_ntoh (&fees->account,
+                     &nbo->account);
+  TALER_amount_ntoh (&fees->purse,
+                     &nbo->purse);
 }
 
 
@@ -138,6 +146,14 @@ TALER_global_fee_set_cmp (const struct TALER_GlobalFeeSet 
*f1,
                           &f2->kyc);
   if (0 != ret)
     return ret;
+  ret = TALER_amount_cmp (&f1->account,
+                          &f2->account);
+  if (0 != ret)
+    return ret;
+  ret = TALER_amount_cmp (&f1->purse,
+                          &f2->purse);
+  if (0 != ret)
+    return ret;
   return 0;
 }
 

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