245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2023 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file lib/exchange_api_lookup_aml_decision.c
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* @brief Implementation of the /aml/$OFFICER_PUB/decision request
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <microhttpd.h> /* just for HTTP status codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_exchange_service.h"
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#include "taler_json_lib.h"
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#include "exchange_api_handle.h"
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#include "taler_signatures.h"
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#include "exchange_api_curl_defaults.h"
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/**
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* @brief A /coins/$COIN_PUB/link Handle
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*/
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struct TALER_EXCHANGE_LookupAmlDecision
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{
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Function to call with the result.
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*/
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TALER_EXCHANGE_LookupAmlDecisionCallback decision_cb;
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/**
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* Closure for @e cb.
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*/
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void *decision_cb_cls;
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};
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/**
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* Parse the provided decision data from the "200 OK" response.
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*
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* @param[in,out] lh handle (callback may be zero'ed out)
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* @param json json reply with the data for one coin
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* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
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*/
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static enum GNUNET_GenericReturnValue
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parse_decision_ok (struct TALER_EXCHANGE_LookupAmlDecision *lh,
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const json_t *json)
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{
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struct TALER_EXCHANGE_AmlDecisionResponse lr = {
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.hr.reply = json,
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.hr.http_status = MHD_HTTP_OK
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};
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int ret = GNUNET_SYSERR;
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GNUNET_break (0); // FIXME: parse response!
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return ret;
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}
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/**
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* Function called when we're done processing the
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* HTTP /aml/$OFFICER_PUB/decision request.
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*
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* @param cls the `struct TALER_EXCHANGE_LookupAmlDecision`
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* @param response_code HTTP response code, 0 on error
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* @param response parsed JSON result, NULL on error
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*/
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static void
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handle_lookup_finished (void *cls,
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long response_code,
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const void *response)
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{
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struct TALER_EXCHANGE_LookupAmlDecision *lh = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_AmlDecisionResponse lr = {
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.hr.reply = j,
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.hr.http_status = (unsigned int) response_code
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};
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lh->job = NULL;
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switch (response_code)
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{
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case 0:
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lr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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if (GNUNET_OK !=
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parse_decision_ok (lh,
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j))
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{
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GNUNET_break_op (0);
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lr.hr.http_status = 0;
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lr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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break;
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}
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GNUNET_assert (NULL == lh->decision_cb);
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TALER_EXCHANGE_link_cancel (lh);
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return;
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case MHD_HTTP_BAD_REQUEST:
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lr.hr.ec = TALER_JSON_get_error_code (j);
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lr.hr.hint = TALER_JSON_get_error_hint (j);
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/* This should never happen, either us or the exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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break;
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case MHD_HTTP_NOT_FOUND:
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lr.hr.ec = TALER_JSON_get_error_code (j);
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lr.hr.hint = TALER_JSON_get_error_hint (j);
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/* Nothing really to verify, exchange says this coin was not melted; we
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should pass the JSON reply to the application */
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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lr.hr.ec = TALER_JSON_get_error_code (j);
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lr.hr.hint = TALER_JSON_get_error_hint (j);
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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break;
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default:
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/* unexpected response code */
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GNUNET_break_op (0);
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lr.hr.ec = TALER_JSON_get_error_code (j);
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lr.hr.hint = TALER_JSON_get_error_hint (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for exchange link\n",
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(unsigned int) response_code,
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(int) lr.hr.ec);
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break;
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}
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if (NULL != lh->decision_cb)
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lh->decision_cb (lh->decision_cb_cls,
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&lr);
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TALER_EXCHANGE_link_cancel (lh);
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}
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struct TALER_EXCHANGE_LookupAmlDecision *
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TALER_EXCHANGE_lookup_aml_decision (
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struct GNUNET_CURL_Context *ctx,
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const char *url,
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const struct TALER_PaytoHashP *h_payto,
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const struct TALER_AmlOfficerPrivateKeyP *officer_priv,
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TALER_EXCHANGE_LookupAmlDecisionCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_LookupAmlDecision *lh;
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CURL *eh;
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struct TALER_AmlOfficerPublicKeyP officer_pub;
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struct TALER_AmlOfficerSignatureP officer_sig;
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char arg_str[sizeof (officer_pub) * 2
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+ sizeof (*h_payto) * 2 + 32];
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GNUNET_CRYPTO_eddsa_key_get_public (&officer_priv->eddsa_priv,
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&officer_pub.eddsa_pub);
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TALER_officer_aml_query_sign (officer_priv,
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&officer_sig);
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{
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char pub_str[sizeof (officer_pub) * 2];
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char pt_str[sizeof (*h_payto) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (
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&officer_pub,
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sizeof (officer_pub),
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pub_str,
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sizeof (pub_str));
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*end = '\0';
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end = GNUNET_STRINGS_data_to_string (
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h_payto,
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sizeof (*h_payto),
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pt_str,
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sizeof (pt_str));
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*end = '\0';
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GNUNET_snprintf (arg_str,
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sizeof (arg_str),
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"/aml/%s/decision/%s",
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pub_str,
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pt_str);
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}
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lh = GNUNET_new (struct TALER_EXCHANGE_LookupAmlDecision);
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lh->decision_cb = cb;
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lh->decision_cb_cls = cb_cls;
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lh->url = TALER_URL_join (exchange_url,
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arg_str,
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NULL);
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if (NULL == lh->url)
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{
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GNUNET_free (lh);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (lh->url);
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if (NULL == eh)
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{
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GNUNET_break (0);
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GNUNET_free (lh->url);
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GNUNET_free (lh);
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return NULL;
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}
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// FIXME: add authorization header to 'eh' based on officer_sig!
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lh->job = GNUNET_CURL_job_add_with_ct_json (ctx,
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eh,
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&handle_lookup_finished,
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lh);
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return lh;
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}
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void
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TALER_EXCHANGE_lookup_aml_decision_cancel (
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struct TALER_EXCHANGE_LookupAmlDecision *lh)
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{
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if (NULL != lh->job)
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{
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GNUNET_CURL_job_cancel (lh->job);
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lh->job = NULL;
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}
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GNUNET_free (lh->url);
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GNUNET_free (lh);
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}
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/* end of exchange_api_lookup_aml_decision.c */
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