commit 7015c4e14885fb02c126472a82893f1dc6657d62
parent 6866e1580e7298acb5affb5b768faf3900875f5c
Author: Christian Grothoff <christian@grothoff.org>
Date: Tue, 10 Sep 2024 15:15:49 +0200
add TALER_amount_min
Diffstat:
4 files changed, 115 insertions(+), 1 deletion(-)
diff --git a/src/include/taler_amount_lib.h b/src/include/taler_amount_lib.h
@@ -265,6 +265,20 @@ TALER_amount_max (struct TALER_Amount *ma,
/**
+ * Compute minimum of two amounts.
+ *
+ * @param[out] mi set to minimum of @a a1 and @a a2
+ * @param a1 first amount
+ * @param a2 second amount
+ * @return #GNUNET_OK on success
+ */
+enum GNUNET_GenericReturnValue
+TALER_amount_min (struct TALER_Amount *mi,
+ const struct TALER_Amount *a1,
+ const struct TALER_Amount *a2);
+
+
+/**
* Compare the value/fraction of two amounts. Does not compare the currency.
* Comparing amounts of different currencies will cause the program to abort().
* If unsure, check with #TALER_amount_cmp_currency() first to be sure that
diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h
@@ -1041,6 +1041,40 @@ TALER_EXCHANGE_test_account_allowed (
/**
+ * Check the hard limits in @a keys for the given
+ * @a event and lower @a limit to the lowest applicable
+ * limit independent (!) of the timeframe. Useful
+ * to determine the absolute transaction limit.
+ *
+ * @param keys exchange keys to evaluate
+ * @param event trigger type to evaluate
+ * @param[in,out] limit to lower to the minimum limit
+ * that applies to @a event
+ */
+void
+TALER_EXCHANGE_keys_evaluate_hard_limits (
+ const struct TALER_EXCHANGE_Keys *keys,
+ enum TALER_KYCLOGIC_KycTriggerEvent event,
+ struct TALER_Amount *limit);
+
+
+/**
+ * Check if a (soft) limit of zero applies for the
+ * given @a event under @a keys.
+ *
+ * @param keys exchange keys to evaluate
+ * @param event trigger type to evaluate
+ * @return true if the operation is soft-limited and
+ * thus KYC is required before the operation may be
+ * accepted at the exchange
+ */
+bool
+TALER_EXCHANGE_keys_evaluate_zero_limits (
+ const struct TALER_EXCHANGE_Keys *keys,
+ enum TALER_KYCLOGIC_KycTriggerEvent event);
+
+
+/**
* Obtain the denomination key details from the exchange.
*
* @param keys the exchange's key set
diff --git a/src/lib/exchange_api_restrictions.c b/src/lib/exchange_api_restrictions.c
@@ -17,7 +17,7 @@
/**
* @file lib/exchange_api_restrictions.c
* @brief convenience functions related to account restrictions
- * @author Christian Grothoff
+a * @author Christian Grothoff
*/
#include "platform.h"
#include "taler_exchange_service.h"
@@ -96,3 +96,46 @@ TALER_EXCHANGE_test_account_allowed (
} /* end loop over restrictions */
return GNUNET_YES;
}
+
+
+void
+TALER_EXCHANGE_keys_evaluate_hard_limits (
+ const struct TALER_EXCHANGE_Keys *keys,
+ enum TALER_KYCLOGIC_KycTriggerEvent event,
+ struct TALER_Amount *limit)
+{
+ for (unsigned int i = 0; i<keys->hard_limits_length; i++)
+ {
+ const struct TALER_EXCHANGE_AccountLimit *al
+ = &keys->hard_limits[i];
+
+ if (event != al->operation_type)
+ continue;
+ if (al->soft_limit)
+ continue;
+ if (! TALER_amount_cmp_currency (limit,
+ &al->limit))
+ continue;
+ GNUNET_break (GNUNET_OK ==
+ TALER_amount_min (limit,
+ limit,
+ &al->limit));
+ }
+}
+
+
+bool
+TALER_EXCHANGE_keys_evaluate_zero_limits (
+ const struct TALER_EXCHANGE_Keys *keys,
+ enum TALER_KYCLOGIC_KycTriggerEvent event)
+{
+ for (unsigned int i = 0; i<keys->soft_limits_length; i++)
+ {
+ const struct TALER_EXCHANGE_ZeroLimitedOperation *zlo
+ = &keys->zero_limits[i];
+
+ if (event == zlo->operation_type)
+ return true;
+ }
+ return false;
+}
diff --git a/src/util/amount.c b/src/util/amount.c
@@ -293,6 +293,29 @@ TALER_amount_max (struct TALER_Amount *ma,
}
+enum GNUNET_GenericReturnValue
+TALER_amount_min (struct TALER_Amount *mi,
+ const struct TALER_Amount *a1,
+ const struct TALER_Amount *a2)
+{
+ if (GNUNET_OK !=
+ TALER_amount_cmp_currency (a1,
+ a2))
+ {
+ memset (mi,
+ 0,
+ sizeof (*mi));
+ return GNUNET_SYSERR;
+ }
+ if (1 == TALER_amount_cmp (a1,
+ a2))
+ *mi = *a2;
+ else
+ *mi = *a1;
+ return GNUNET_OK;
+}
+
+
bool
TALER_amount_is_zero (const struct TALER_Amount *amount)
{
