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/*
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 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/>
*/
/**
* @file lib/exchange_api_lookup_aml_decisions.c
* @brief Implementation of the /aml/$OFFICER_PUB/decisions request
* @author Christian Grothoff
*/
#include "platform.h"
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A /coins/$COIN_PUB/link Handle
*/
struct TALER_EXCHANGE_LookupAmlDecisions
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_LookupAmlDecisionsCallback decisions_cb;
/**
* Closure for @e cb.
*/
void *decisions_cb_cls;
};
/**
* Parse the provided decision data from the "200 OK" response.
*
* @param[in,out] lh handle (callback may be zero'ed out)
* @param json json reply with the data for one coin
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static enum GNUNET_GenericReturnValue
parse_decisions_ok (struct TALER_EXCHANGE_LookupAmlDecisions *lh,
const json_t *json)
{
struct TALER_EXCHANGE_AmlDecisionsResponse lr = {
.hr.reply = json,
.hr.http_status = MHD_HTTP_OK
};
int ret = GNUNET_SYSERR;
GNUNET_break (0); // FIXME: parse response!
return ret;
}
/**
* Function called when we're done processing the
* HTTP /aml/$OFFICER_PUB/decisions request.
*
* @param cls the `struct TALER_EXCHANGE_LookupAmlDecisions`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_lookup_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_LookupAmlDecisions *lh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_AmlDecisionsResponse lr = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code
};
lh->job = NULL;
switch (response_code)
{
case 0:
lr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
if (GNUNET_OK !=
parse_decisions_ok (lh,
j))
{
GNUNET_break_op (0);
lr.hr.http_status = 0;
lr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
GNUNET_assert (NULL == lh->decisions_cb);
TALER_EXCHANGE_link_cancel (lh);
return;
case MHD_HTTP_BAD_REQUEST:
lr.hr.ec = TALER_JSON_get_error_code (j);
lr.hr.hint = TALER_JSON_get_error_hint (j);
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
break;
case MHD_HTTP_NOT_FOUND:
lr.hr.ec = TALER_JSON_get_error_code (j);
lr.hr.hint = TALER_JSON_get_error_hint (j);
/* Nothing really to verify, exchange says this coin was not melted; we
should pass the JSON reply to the application */
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
lr.hr.ec = TALER_JSON_get_error_code (j);
lr.hr.hint = TALER_JSON_get_error_hint (j);
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_break_op (0);
lr.hr.ec = TALER_JSON_get_error_code (j);
lr.hr.hint = TALER_JSON_get_error_hint (j);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d for exchange link\n",
(unsigned int) response_code,
(int) lr.hr.ec);
break;
}
if (NULL != lh->decisions_cb)
lh->decisions_cb (lh->decisions_cb_cls,
&lr);
TALER_EXCHANGE_link_cancel (lh);
}
struct TALER_EXCHANGE_LookupAmlDecisions *
TALER_EXCHANGE_lookup_aml_decisions (
struct GNUNET_CURL_Context *ctx,
const char *url,
uint64_t start,
int delta,
bool filter_frozen,
bool filter_pending,
bool filter_normal,
const struct TALER_AmlOfficerPrivateKeyP *officer_priv,
TALER_EXCHANGE_LookupAmlDecisionsCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_LookupAmlDecisions *lh;
CURL *eh;
struct TALER_AmlOfficerPublicKeyP officer_pub;
struct TALER_AmlOfficerSignatureP officer_sig;
char arg_str[sizeof (struct TALER_AmlOfficerPublicKeyP) * 2 + 32];
GNUNET_CRYPTO_eddsa_key_get_public (&officer_priv->eddsa_priv,
&officer_pub.eddsa_pub);
TALER_officer_aml_query_sign (officer_priv,
&officer_sig);
{
char pub_str[sizeof (struct TALER_AmlOfficerPublicKeyP) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (
&officer_pub,
sizeof (officer_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"/aml/%s/decisions",
pub_str);
}
lh = GNUNET_new (struct TALER_EXCHANGE_LookupAmlDecisions);
lh->decisions_cb = cb;
lh->decisions_cb_cls = cb_cls;
lh->url = TALER_URL_join (exchange_url,
arg_str,
"frozen",
filter_fozen ? "yes" : NULL,
"pending",
filter_pending ? "yes" : NULL,
"normal",
filter_normal ? "yes" : NULL,
NULL);
if (NULL == lh->url)
{
GNUNET_free (lh);
return NULL;
}
eh = TALER_EXCHANGE_curl_easy_get_ (lh->url);
if (NULL == eh)
{
GNUNET_break (0);
GNUNET_free (lh->url);
GNUNET_free (lh);
return NULL;
}
// FIXME: add authorization header to 'eh' based on officer_sig!
lh->job = GNUNET_CURL_job_add_with_ct_json (ctx,
eh,
&handle_lookup_finished,
lh);
return lh;
}
void
TALER_EXCHANGE_lookup_aml_decisions_cancel (
struct TALER_EXCHANGE_LookupAmlDecisions *lh)
{
if (NULL != lh->job)
{
GNUNET_CURL_job_cancel (lh->job);
lh->job = NULL;
}
GNUNET_free (lh->url);
GNUNET_free (lh);
}
/* end of exchange_api_lookup_aml_decisions.c */
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