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--
-- This file is part of TALER
-- Copyright (C) 2023, 2024 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_insert_aml_decision;
CREATE FUNCTION exchange_do_insert_aml_decision(
IN in_payto_uri TEXT, -- can be NULL!
IN in_h_normalized_payto BYTEA,
IN in_h_full_payto BYTEA, -- can be NULL!
IN in_decision_time INT8,
IN in_expiration_time INT8,
IN in_properties TEXT, -- can be NULL
IN in_new_rules TEXT,
IN in_to_investigate BOOLEAN,
IN in_new_measure_name TEXT, -- can be NULL
IN in_jmeasures TEXT, -- can be NULL
IN in_justification TEXT,
IN in_decider_pub BYTEA,
IN in_decider_sig BYTEA,
IN in_notify_s TEXT,
OUT out_invalid_officer BOOLEAN,
OUT out_account_unknown BOOLEAN,
OUT out_last_date INT8,
OUT out_legitimization_measure_serial_id INT8)
LANGUAGE plpgsql
AS $$
DECLARE
my_outcome_serial_id INT8;
my_access_token BYTEA;
BEGIN
out_account_unknown=FALSE;
out_legitimization_measure_serial_id=0;
-- Check officer is eligible to make decisions.
PERFORM
FROM aml_staff
WHERE decider_pub=in_decider_pub
AND is_active
AND NOT read_only;
IF NOT FOUND
THEN
out_invalid_officer=TRUE;
out_last_date=0;
RETURN;
END IF;
out_invalid_officer=FALSE;
-- Check no more recent decision exists.
SELECT decision_time
INTO out_last_date
FROM legitimization_outcomes
WHERE h_payto=in_h_normalized_payto
AND is_active
ORDER BY decision_time DESC;
IF FOUND
THEN
IF out_last_date >= in_decision_time
THEN
-- Refuse to insert older decision.
RETURN;
END IF;
UPDATE legitimization_outcomes
SET is_active=FALSE
WHERE h_payto=in_h_normalized_payto
AND is_active;
ELSE
out_last_date = 0;
END IF;
SELECT access_token
INTO my_access_token
FROM wire_targets
WHERE h_normalized_payto=in_h_normalized_payto;
IF NOT FOUND
THEN
IF in_payto_uri IS NULL
THEN
-- AML decision on an unknown account without payto_uri => fail.
out_account_unknown=TRUE;
RETURN;
END IF;
INSERT INTO wire_targets
(wire_target_h_payto
,h_normalized_payto
,payto_uri)
VALUES
(in_h_full_payto
,in_h_normalized_payto
,in_payto_uri)
RETURNING access_token
INTO my_access_token;
END IF;
-- Did KYC measures get prescribed?
IF in_jmeasures IS NOT NULL
THEN
-- First check if a perfectly equivalent legi measure
-- already exists, to avoid creating tons of duplicates.
SELECT legitimization_measure_serial_id
INTO out_legitimization_measure_serial_id
FROM legitimization_measures
WHERE access_token=my_access_token
AND jmeasures=in_jmeasures
AND NOT is_finished;
IF NOT FOUND
THEN
-- Enable new legitimization measure
INSERT INTO legitimization_measures
(access_token
,start_time
,jmeasures
,display_priority)
VALUES
(my_access_token
,in_decision_time
,in_jmeasures
,1)
RETURNING
legitimization_measure_serial_id
INTO
out_legitimization_measure_serial_id;
END IF;
-- end if for where we had in_jmeasures
END IF;
-- AML decision: mark all other active measures finished!
UPDATE legitimization_measures
SET is_finished=TRUE
WHERE access_token=my_access_token
AND NOT is_finished
AND legitimization_measure_serial_id != out_legitimization_measure_serial_id;
UPDATE legitimization_outcomes
SET is_active=FALSE
WHERE h_payto=in_h_normalized_payto
-- this clause is a minor optimization to avoid
-- updating outcomes that have long expired.
AND expiration_time >= in_decision_time;
INSERT INTO legitimization_outcomes
(h_payto
,decision_time
,expiration_time
,jproperties
,new_measure_name
,to_investigate
,jnew_rules
)
VALUES
(in_h_normalized_payto
,in_decision_time
,in_expiration_time
,in_properties
,in_new_measure_name
,in_to_investigate
,in_new_rules
)
RETURNING
outcome_serial_id
INTO
my_outcome_serial_id;
INSERT INTO aml_history
(h_payto
,outcome_serial_id
,justification
,decider_pub
,decider_sig
) VALUES
(in_h_normalized_payto
,my_outcome_serial_id
,in_justification
,in_decider_pub
,in_decider_sig
);
-- wake up taler-exchange-aggregator
INSERT INTO kyc_alerts
(h_payto
,trigger_type)
VALUES
(in_h_normalized_payto,1)
ON CONFLICT DO NOTHING;
EXECUTE FORMAT (
'NOTIFY %s'
,in_notify_s);
END $$;
COMMENT ON FUNCTION exchange_do_insert_aml_decision(TEXT, BYTEA, BYTEA, INT8, INT8, TEXT, TEXT, BOOLEAN, TEXT, TEXT, TEXT, BYTEA, BYTEA, TEXT)
IS 'Checks whether the AML officer is eligible to make AML decisions and if so inserts the decision into the table';
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