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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 merchant_api_get_products.c
* @brief Implementation of the GET /products 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 <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
/**
* Handle for a GET /products operation.
*/
struct TALER_MERCHANT_ProductsGetHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_ProductsGetCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Parse product information from @a ia.
*
* @param ia JSON array (or NULL!) with product data
* @param pgh operation handle
* @return #GNUNET_OK on success
*/
static int
parse_products (const json_t *ia,
struct TALER_MERCHANT_ProductsGetHandle *pgh)
{
unsigned int ies_len = json_array_size (ia);
struct TALER_MERCHANT_InventoryEntry ies[ies_len];
size_t index;
json_t *value;
int ret;
ret = GNUNET_OK;
json_array_foreach (ia, index, value) {
struct TALER_MERCHANT_InventoryEntry *ie = &ies[index];
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("product_id",
&ie->product_id),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (value,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
ret = GNUNET_SYSERR;
continue;
}
if (GNUNET_SYSERR == ret)
break;
}
if (GNUNET_OK == ret)
{
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = MHD_HTTP_OK
};
pgh->cb (pgh->cb_cls,
&hr,
ies_len,
ies);
pgh->cb = NULL; /* just to be sure */
}
return ret;
}
/**
* Function called when we're done processing the
* HTTP /products request.
*
* @param cls the `struct TALER_MERCHANT_ProductsGetHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not in JSON
*/
static void
handle_get_products_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_ProductsGetHandle *pgh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
pgh->job = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got /products response with status code %u\n",
(unsigned int) response_code);
switch (response_code)
{
case MHD_HTTP_OK:
{
json_t *products;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("products",
&products),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
hr.http_status = 0;
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
}
else
{
if ( (! json_is_array (products)) ||
(GNUNET_OK ==
parse_products (products,
pgh)) )
{
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_products_get_cancel (pgh);
return;
}
else
{
hr.http_status = 0;
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
}
}
GNUNET_JSON_parse_free (spec);
break;
}
default:
/* unexpected response code */
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d\n",
(unsigned int) response_code,
(int) hr.ec);
break;
}
pgh->cb (pgh->cb_cls,
&hr,
0,
NULL);
TALER_MERCHANT_products_get_cancel (pgh);
}
struct TALER_MERCHANT_ProductsGetHandle *
TALER_MERCHANT_products_get (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
TALER_MERCHANT_ProductsGetCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_ProductsGetHandle *pgh;
CURL *eh;
pgh = GNUNET_new (struct TALER_MERCHANT_ProductsGetHandle);
pgh->ctx = ctx;
pgh->cb = cb;
pgh->cb_cls = cb_cls;
pgh->url = TALER_url_join (backend_url,
"private/products",
NULL);
if (NULL == pgh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (pgh);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting URL '%s'\n",
pgh->url);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
pgh->url));
pgh->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_get_products_finished,
pgh);
return pgh;
}
void
TALER_MERCHANT_products_get_cancel (
struct TALER_MERCHANT_ProductsGetHandle *pgh)
{
if (NULL != pgh->job)
GNUNET_CURL_job_cancel (pgh->job);
GNUNET_free (pgh->url);
GNUNET_free (pgh);
}
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