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/*
This file is part of TALER
Copyright (C) 2021, 2022 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_kyc_proof.c
* @brief Implementation of the /kyc-proof request
* @author Christian Grothoff
*/
#include "platform.h"
#include <microhttpd.h> /* just for HTTP proof 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 ``/kyc-proof`` handle
*/
struct TALER_EXCHANGE_KycProofHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Handle to our CURL request.
*/
CURL *eh;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_KycProofCallback cb;
/**
* Closure for @e cb.
*/
void *cb_cls;
};
/**
* Function called when we're done processing the
* HTTP /kyc-proof request.
*
* @param cls the `struct TALER_EXCHANGE_KycProofHandle`
* @param response_code HTTP response code, 0 on error
* @param body response body
* @param body_size number of bytes in @a body
*/
static void
handle_kyc_proof_finished (void *cls,
long response_code,
const void *body,
size_t body_size)
{
struct TALER_EXCHANGE_KycProofHandle *kph = cls;
struct TALER_EXCHANGE_KycProofResponse kpr = {
.http_status = (unsigned int) response_code
};
(void) body;
(void) body_size;
kph->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_SEE_OTHER:
{
char *redirect_url;
GNUNET_assert (CURLE_OK ==
curl_easy_getinfo (kph->eh,
CURLINFO_REDIRECT_URL,
&redirect_url));
kpr.details.found.redirect_url = redirect_url;
break;
}
case MHD_HTTP_BAD_REQUEST:
/* 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_UNAUTHORIZED:
break;
case MHD_HTTP_FORBIDDEN:
break;
case MHD_HTTP_NOT_FOUND:
break;
case MHD_HTTP_BAD_GATEWAY:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
case MHD_HTTP_GATEWAY_TIMEOUT:
/* 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);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u for exchange kyc_proof\n",
(unsigned int) response_code);
break;
}
kph->cb (kph->cb_cls,
&kpr);
TALER_EXCHANGE_kyc_proof_cancel (kph);
}
struct TALER_EXCHANGE_KycProofHandle *
TALER_EXCHANGE_kyc_proof (struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_PaytoHashP *h_payto,
const char *logic,
const char *args,
TALER_EXCHANGE_KycProofCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_KycProofHandle *kph;
struct GNUNET_CURL_Context *ctx;
char *arg_str;
if (NULL == args)
args = "";
else
GNUNET_assert (args[0] == '&');
if (GNUNET_YES !=
TEAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
{
char hstr[sizeof (struct TALER_PaytoHashP) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (h_payto,
sizeof (*h_payto),
hstr,
sizeof (hstr));
*end = '\0';
GNUNET_asprintf (&arg_str,
"/kyc-proof/%s?state=%s%s",
logic,
hstr,
args);
}
kph = GNUNET_new (struct TALER_EXCHANGE_KycProofHandle);
kph->exchange = exchange;
kph->cb = cb;
kph->cb_cls = cb_cls;
kph->url = TEAH_path_to_url (exchange,
arg_str);
GNUNET_free (arg_str);
if (NULL == kph->url)
{
GNUNET_free (kph);
return NULL;
}
kph->eh = TALER_EXCHANGE_curl_easy_get_ (kph->url);
if (NULL == kph->eh)
{
GNUNET_break (0);
GNUNET_free (kph->url);
GNUNET_free (kph);
return NULL;
}
/* disable location following, we want to learn the
result of a 303 redirect! */
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (kph->eh,
CURLOPT_FOLLOWLOCATION,
0L));
ctx = TEAH_handle_to_context (exchange);
kph->job = GNUNET_CURL_job_add_raw (ctx,
kph->eh,
NULL,
&handle_kyc_proof_finished,
kph);
return kph;
}
void
TALER_EXCHANGE_kyc_proof_cancel (struct TALER_EXCHANGE_KycProofHandle *kph)
{
if (NULL != kph->job)
{
GNUNET_CURL_job_cancel (kph->job);
kph->job = NULL;
}
GNUNET_free (kph->url);
GNUNET_free (kph);
}
/* end of exchange_api_kyc_proof.c */
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