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/*
This file is part of TALER
Copyright (C) 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_lock_product.c
* @brief Implementation of the POST /products/$ID/lock request
* of the merchant's HTTP API
* @author Christian Grothoff
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_curl_lib.h>
/**
* Handle for a POST /products/$ID/lock operation.
*/
struct TALER_MERCHANT_ProductLockHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_ProductLockCallback 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 /products/$ID/lock request.
*
* @param cls the `struct TALER_MERCHANT_ProductLockHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not in JSON
*/
static void
handle_lock_product_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_ProductLockHandle *plh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
plh->job = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"LOCK /products/$ID completed with response code %u\n",
(unsigned int) response_code);
switch (response_code)
{
case 0:
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_NO_CONTENT:
break;
case MHD_HTTP_UNAUTHORIZED:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
case MHD_HTTP_BAD_REQUEST:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
GNUNET_break_op (0);
/* This should never happen, either us
* or the merchant is buggy (or API version conflict);
* just pass JSON reply to the application */
break;
case MHD_HTTP_FORBIDDEN:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we tried to abort the payment
* after it was successful. We should pass the JSON reply to the
* application */
break;
case MHD_HTTP_NOT_FOUND:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
case MHD_HTTP_GONE:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Server had an internal issue; we should retry,
but this API leaves this to the application */
break;
default:
TALER_MERCHANT_parse_error_details_ (json,
response_code,
&hr);
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d\n",
(unsigned int) response_code,
(int) hr.ec);
GNUNET_break_op (0);
break;
}
plh->cb (plh->cb_cls,
&hr);
TALER_MERCHANT_product_lock_cancel (plh);
}
struct TALER_MERCHANT_ProductLockHandle *
TALER_MERCHANT_product_lock (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *product_id,
const char *uuid,
struct GNUNET_TIME_Relative duration,
uint32_t quantity,
TALER_MERCHANT_ProductLockCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_ProductLockHandle *plh;
json_t *req_obj;
req_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("lock_uuid",
uuid),
GNUNET_JSON_pack_time_rel ("duration",
duration),
GNUNET_JSON_pack_uint64 ("quantity",
quantity));
plh = GNUNET_new (struct TALER_MERCHANT_ProductLockHandle);
plh->ctx = ctx;
plh->cb = cb;
plh->cb_cls = cb_cls;
{
char *path;
GNUNET_asprintf (&path,
"private/products/%s/lock",
product_id);
plh->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
}
if (NULL == plh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
json_decref (req_obj);
GNUNET_free (plh);
return NULL;
}
{
CURL *eh;
eh = curl_easy_init ();
if (GNUNET_OK !=
TALER_curl_easy_post (&plh->post_ctx,
eh,
req_obj))
{
GNUNET_break (0);
json_decref (req_obj);
GNUNET_free (plh);
return NULL;
}
json_decref (req_obj);
GNUNET_assert (CURLE_OK == curl_easy_setopt (eh,
CURLOPT_URL,
plh->url));
plh->job = GNUNET_CURL_job_add2 (ctx,
eh,
plh->post_ctx.headers,
&handle_lock_product_finished,
plh);
}
return plh;
}
void
TALER_MERCHANT_product_lock_cancel (
struct TALER_MERCHANT_ProductLockHandle *plh)
{
if (NULL != plh->job)
{
GNUNET_CURL_job_cancel (plh->job);
plh->job = NULL;
}
TALER_curl_easy_post_finished (&plh->post_ctx);
GNUNET_free (plh->url);
GNUNET_free (plh);
}
/* end of merchant_api_lock_product.c */
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