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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016, 2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
TALER; see the file COPYING.LGPL. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file merchant_api_post_reserves.c
* @brief Implementation of the POST /reserves request of the merchant's HTTP API
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_curl_lib.h>
#include <taler/taler_json_lib.h>
/**
* @brief A handle for POSTing reserve data.
*/
struct TALER_MERCHANT_PostReservesHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_PostReservesCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Minor context that holds body and headers.
*/
struct TALER_CURL_PostContext post_ctx;
};
/**
* Function called when we're done processing the
* HTTP POST /reserves request.
*
* @param cls the `struct TALER_MERCHANT_PostReservesHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not in JSON
*/
static void
handle_post_reserves_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_PostReservesHandle *prh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
prh->job = NULL;
switch (response_code)
{
case 0:
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
{
const char *payto_uri;
struct TALER_ReservePublicKeyP reserve_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("reserve_pub",
&reserve_pub),
GNUNET_JSON_spec_string ("payto_uri",
&payto_uri),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
hr.http_status = 0;
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
}
else
{
prh->cb (prh->cb_cls,
&hr,
&reserve_pub,
payto_uri);
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_reserves_post_cancel (prh);
return;
}
}
case MHD_HTTP_ACCEPTED:
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify, this should never
happen, we should pass the JSON reply to the application */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Did not find any data\n");
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
default:
/* unexpected response code */
GNUNET_break_op (0);
TALER_MERCHANT_parse_error_details_ (json,
response_code,
&hr);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d\n",
(unsigned int) response_code,
(int) hr.ec);
break;
}
prh->cb (prh->cb_cls,
&hr,
NULL,
NULL);
TALER_MERCHANT_reserves_post_cancel (prh);
}
struct TALER_MERCHANT_PostReservesHandle *
TALER_MERCHANT_reserves_post (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct TALER_Amount *initial_balance,
const char *exchange_url,
const char *wire_method,
TALER_MERCHANT_PostReservesCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_PostReservesHandle *prh;
CURL *eh;
json_t *req;
prh = GNUNET_new (struct TALER_MERCHANT_PostReservesHandle);
prh->ctx = ctx;
prh->cb = cb;
prh->cb_cls = cb_cls;
prh->url = TALER_url_join (backend_url,
"private/reserves",
NULL);
if (NULL == prh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (prh);
return NULL;
}
req = json_pack ("{s:o, s:s, s:s}",
"initial_balance", TALER_JSON_from_amount (initial_balance),
"wire_method", wire_method,
"exchange_url", exchange_url);
GNUNET_assert (NULL != req);
eh = curl_easy_init ();
GNUNET_assert (NULL != eh);
if (GNUNET_OK != TALER_curl_easy_post (&prh->post_ctx,
eh,
req))
{
GNUNET_break (0);
json_decref (req);
GNUNET_free (prh);
return NULL;
}
json_decref (req);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
prh->url));
prh->job = GNUNET_CURL_job_add2 (ctx,
eh,
prh->post_ctx.headers,
&handle_post_reserves_finished,
prh);
return prh;
}
void
TALER_MERCHANT_reserves_post_cancel (
struct TALER_MERCHANT_PostReservesHandle *prh)
{
if (NULL != prh->job)
{
GNUNET_CURL_job_cancel (prh->job);
prh->job = NULL;
}
GNUNET_free (prh->url);
TALER_curl_easy_post_finished (&prh->post_ctx);
GNUNET_free (prh);
}
/* end of merchant_api_post_reserves.c */
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