From c30ee88336ef7c26d9f6b74b47bd0acea751c2ee Mon Sep 17 00:00:00 2001
From: Christian Grothoff <grothoff@gnunet.org>
Date: Fri, 20 Jan 2023 14:46:33 +0100
Subject: [PATCH] skeleton for AML decision server handler

---
 .../taler-exchange-httpd_aml-decision.c       | 149 ++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 src/exchange/taler-exchange-httpd_aml-decision.c

diff --git a/src/exchange/taler-exchange-httpd_aml-decision.c b/src/exchange/taler-exchange-httpd_aml-decision.c
new file mode 100644
index 000000000..0526e79d8
--- /dev/null
+++ b/src/exchange/taler-exchange-httpd_aml-decision.c
@@ -0,0 +1,149 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2023 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero 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 Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-exchange-httpd_aml-decision.c
+ * @brief Handle request about an AML decision.
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <jansson.h>
+#include <microhttpd.h>
+#include <pthread.h>
+#include "taler_json_lib.h"
+#include "taler_mhd_lib.h"
+#include "taler_signatures.h"
+#include "taler-exchange-httpd_responses.h"
+
+
+
+MHD_RESULT
+TEH_handler_management_post_aml_decision (
+  struct MHD_Connection *connection,
+  const json_t *root)
+{
+  const char *justification;
+  struct GNUNET_TIME_Timestamp decision_time;
+  struct TALER_Amount new_threshold;
+  struct TALER_PaytoHashP h_payto;
+  uint32_t new_state32;
+  enum TALER_AmlDecisionState new_state;
+  struct TALER_AmlOfficerPublicKeyP officer_pub;
+  struct TALER_AmlOfficerSignatureP officer_sig;
+  struct GNUNET_JSON_Specification spec[] = {
+    GNUNET_JSON_spec_fixed_auto ("officer_pub",
+                                 &officer_pub),
+    GNUNET_JSON_spec_fixed_auto ("officer_sig",
+                                 &officer_sig),
+    GNUNET_JSON_spec_fixed_auto ("h_payto",
+                                 &h_payto),
+    TALER_JSON_spec_amount ("new_threshold",
+                            &new_threshold),
+    GNUNET_JSON_spec_string ("justification",
+                             &justification),
+    GNUNET_JSON_spec_timestamp ("decision_time",
+                                &decision_time),
+    GNUNET_JSON_spec_uint32 ("new_state",
+                             &new_state32),
+    GNUNET_JSON_spec_end ()
+  };
+
+  {
+    enum GNUNET_GenericReturnValue res;
+
+    res = TALER_MHD_parse_json_data (connection,
+                                     root,
+                                     spec);
+    if (GNUNET_SYSERR == res)
+      return MHD_NO; /* hard failure */
+    if (GNUNET_NO == res)
+      return MHD_YES; /* failure */
+  }
+  new_state = (enum TALER_AmlDecisionState) new_state32;
+  TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
+  if (GNUNET_OK !=
+      TALER_exchange_aml_decision_verify (justification,
+                                          decision_time,
+                                          &new_threshold,
+                                          &h_payto,
+                                          new_state,
+                                          &officer_pub,
+                                          &officer_sig))
+  {
+    GNUNET_break_op (0);
+    return TALER_MHD_reply_with_error (
+      connection,
+      MHD_HTTP_FORBIDDEN,
+      TALER_EC_EXCHANGE_AML_DECISION_ADD_SIGNATURE_INVALID,
+      NULL);
+  }
+  {
+    enum GNUNET_DB_QueryStatus qs;
+    struct GNUNET_TIME_Timestamp last_date;
+    bool invalid_officer;
+
+    do {
+      qs = TEH_plugin->add_aml_decision (TEH_plugin->cls,
+                                         justification,
+                                         decision_time,
+                                         &new_threshold,
+                                         &h_payto,
+                                         new_state,
+                                         &officer_pub,
+                                         &officer_sig,
+                                         &invalid_officer,
+                                         &last_date);
+    } while (GNUNET_DB_STATUS_SOFT_ERROR == qs);
+    if (qs < 0)
+    {
+      GNUNET_break (0);
+      *mhd_ret = TALER_MHD_reply_with_error (connection,
+                                             MHD_HTTP_INTERNAL_SERVER_ERROR,
+                                             TALER_EC_GENERIC_DB_STORE_FAILED,
+                                             "add aml_decision");
+      return qs;
+    }
+    if (invalid_officer)
+    {
+      return TALER_MHD_reply_with_error (
+                                         connection,
+                                         MHD_HTTP_FORBIDDEN,
+                                         TALER_EC_EXCHANGE_AML_DECISION_INVALID_OFFICER,
+                                         NULL);
+    } 
+    if (GNUNET_TIME_timestamp_cmp (last_date,
+                                   >,
+                                   validity_start))
+    {
+      GNUNET_break_op (0);
+      return TALER_MHD_reply_with_error (
+                                         connection,
+                                         MHD_HTTP_CONFLICT,
+                                         TALER_EC_EXCHANGE_AML_DECISION_MORE_RECENT_PRESENT,
+                                         NULL);
+    }
+  }
+  return TALER_MHD_reply_static (
+    connection,
+    MHD_HTTP_NO_CONTENT,
+    NULL,
+    NULL,
+    0);
+}
+
+
+/* end of taler-exchange-httpd_aml-decision.c */