include/sql/exchange_do_get_kyc_rules.sql

@@ -0,0 +1,76 @@
+--
+-- This file is part of TALER
+-- Copyright (C) 2023-2025 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/>
+
+DROP FUNCTION IF EXISTS exchange_do_get_kyc_rules;
+
+CREATE FUNCTION exchange_do_get_kyc_rules(
+  IN in_h_payto BYTEA,
+  IN in_now INT8,
+  IN in_merchant_pub BYTEA, -- possibly NULL
+  OUT out_target_pub BYTEA, -- possibly NULL
+  OUT out_reserve_pub BYTEA, -- possibly NULL
+  OUT out_jnew_rules JSONB -- possibly NULL
+ )
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  my_found BOOL;
+BEGIN
+  IF in_merchant_pub IS NOT NULL
+  THEN
+    PERFORM FROM reserves_in
+      WHERE reserve_pub=in_merchant_pub
+        AND wire_source_h_payto IN
+         (SELECT wire_target_h_payto
+            FROM wire_targets
+           WHERE h_normalized_payto = in_h_payto);
+    my_found = FOUND;
+  ELSE
+    my_found = FALSE;
+  END IF;
+  IF FOUND
+  THEN
+    -- The merchant_pub used by the client matches, use that
+    out_reserve_pub = in_merchant_pub;
+  ELSE
+    -- If multiple reserves_in match, we pick the latest one
+    SELECT reserve_pub
+      INTO out_reserve_pub
+      FROM reserves_in
+     WHERE wire_source_h_payto IN
+      (SELECT wire_target_h_payto
+         FROM wire_targets
+        WHERE h_normalized_payto = in_h_payto)
+     ORDER BY execution_date DESC
+     LIMIT 1;
+  END IF;
+
+  SELECT target_pub
+    INTO out_target_pub
+    FROM kyc_targets
+   WHERE h_normalized_payto = in_h_payto;
+
+  SELECT jnew_rules
+    INTO out_jnew_rules
+    FROM legitimization_outcomes
+   WHERE h_payto = in_h_payto
+     AND COALESCE(expiration_time >= $2, TRUE)
+     AND COALESCE(is_active, TRUE)
+   -- technically only one should ever be active, but we can be conservative
+   ORDER BY expiration_time DESC
+   LIMIT 1;
+
+
+END $$;