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/*
This file is part of TALER
Copyright (C) 2014-2018, 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 lib/merchant_api_wallet_get_tip.c
* @brief Implementation of the GET /tips/$TIP_ID request of the merchant's HTTP API
* @author Florian Dold
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
/**
* @brief A handle for tracking /tip-get operations
*/
struct TALER_MERCHANT_TipWalletGetHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TipWalletGetCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Function called when we're done processing the
* HTTP /track/transaction request.
*
* @param cls the `struct TALER_MERCHANT_TipGetHandle`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_wallet_tip_get_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_TipWalletGetHandle *tgh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got /tip/$TIP_ID response with status code %u\n",
(unsigned int) response_code);
tgh->job = NULL;
switch (response_code)
{
case MHD_HTTP_OK:
{
const char *exchange_url;
struct TALER_Amount amount_remaining;
struct GNUNET_TIME_Absolute expiration;
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_absolute_time ("expiration",
&expiration),
GNUNET_JSON_spec_string ("exchange_url",
&exchange_url),
TALER_JSON_spec_amount ("tip_amount",
&amount_remaining),
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;
}
tgh->cb (tgh->cb_cls,
&hr,
expiration,
exchange_url,
&amount_remaining);
TALER_MERCHANT_wallet_tip_get_cancel (tgh);
return;
}
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;
case MHD_HTTP_NOT_FOUND:
/* legal, can happen if instance or tip reserve is unknown */
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;
}
tgh->cb (tgh->cb_cls,
&hr,
GNUNET_TIME_UNIT_ZERO_ABS,
NULL,
NULL);
TALER_MERCHANT_wallet_tip_get_cancel (tgh);
}
/**
* Issue a GET /tips/$TIP_ID request to the backend. Informs the backend
* that a customer wants to pick up a tip.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @param tip_id which tip should we query
* @param cb function to call with the result
* @param cb_cls closure for @a cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_TipWalletGetHandle *
TALER_MERCHANT_wallet_tip_get (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct GNUNET_HashCode *tip_id,
TALER_MERCHANT_TipWalletGetCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_TipWalletGetHandle *tgh;
CURL *eh;
tgh = GNUNET_new (struct TALER_MERCHANT_TipWalletGetHandle);
tgh->ctx = ctx;
tgh->cb = cb;
tgh->cb_cls = cb_cls;
{
char res_str[sizeof (*tip_id) * 2];
char arg_str[sizeof (res_str) + 48];
char *end;
end = GNUNET_STRINGS_data_to_string (tip_id,
sizeof (*tip_id),
res_str,
sizeof (res_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"tips/%s",
res_str);
tgh->url = TALER_url_join (backend_url,
arg_str,
NULL);
}
if (NULL == tgh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (tgh);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Requesting URL '%s'\n",
tgh->url);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
tgh->url));
tgh->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_wallet_tip_get_finished,
tgh);
return tgh;
}
/**
* Cancel a GET /tips/$TIP_ID request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param tqo handle to the operation being cancelled
*/
void
TALER_MERCHANT_wallet_tip_get_cancel (
struct TALER_MERCHANT_TipWalletGetHandle *tgh)
{
if (NULL != tgh->job)
{
GNUNET_CURL_job_cancel (tgh->job);
tgh->job = NULL;
}
GNUNET_free (tgh->url);
GNUNET_free (tgh);
}
/* end of merchant_api_wallet_get_tip.c */
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