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/*
This file is part of TALER
Copyright (C) 2022 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_template.c
* @brief Implementation of the GET /templates/$ID request of the merchant's HTTP API
* @author Priscilla HUANG
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include "merchant_api_curl_defaults.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
/**
* Handle for a GET /templates/$ID operation.
*/
struct TALER_MERCHANT_TemplateGetHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TemplateGetCallback 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 GET /templates/$ID request.
*
* @param cls the `struct TALER_MERCHANT_TemplateGetHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not in JSON
*/
static void
handle_get_template_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_TemplateGetHandle *tgh = cls;
const json_t *json = response;
struct TALER_MERCHANT_TemplateGetResponse tgr = {
.hr.http_status = (unsigned int) response_code,
.hr.reply = json
};
tgh->job = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got /templates/$ID response with status code %u\n",
(unsigned int) response_code);
switch (response_code)
{
case MHD_HTTP_OK:
{
uint32_t alg32;
const json_t *contract;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("template_description",
&tgr.details.ok.template_description),
GNUNET_JSON_spec_uint32 ("pos_algorithm",
&alg32),
GNUNET_JSON_spec_mark_optional (
GNUNET_JSON_spec_string ("pos_key",
&tgr.details.ok.pos_key),
NULL),
GNUNET_JSON_spec_object_const ("template_contract",
&contract),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK ==
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
tgr.details.ok.mca =
(enum TALER_MerchantConfirmationAlgorithm) alg32;
tgr.details.ok.template_contract = contract;
tgh->cb (tgh->cb_cls,
&tgr);
TALER_MERCHANT_template_get_cancel (tgh);
return;
}
tgr.hr.http_status = 0;
tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
case MHD_HTTP_UNAUTHORIZED:
tgr.hr.ec = TALER_JSON_get_error_code (json);
tgr.hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
case MHD_HTTP_NOT_FOUND:
tgr.hr.ec = TALER_JSON_get_error_code (json);
tgr.hr.hint = TALER_JSON_get_error_hint (json);
break;
default:
/* unexpected response code */
tgr.hr.ec = TALER_JSON_get_error_code (json);
tgr.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) tgr.hr.ec);
break;
}
tgh->cb (tgh->cb_cls,
&tgr);
TALER_MERCHANT_template_get_cancel (tgh);
}
struct TALER_MERCHANT_TemplateGetHandle *
TALER_MERCHANT_template_get (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *template_id,
TALER_MERCHANT_TemplateGetCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_TemplateGetHandle *tgh;
CURL *eh;
tgh = GNUNET_new (struct TALER_MERCHANT_TemplateGetHandle);
tgh->ctx = ctx;
tgh->cb = cb;
tgh->cb_cls = cb_cls;
{
char *path;
GNUNET_asprintf (&path,
"private/templates/%s",
template_id);
tgh->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
}
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_DEBUG,
"Requesting URL '%s'\n",
tgh->url);
eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
tgh->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_get_template_finished,
tgh);
return tgh;
}
void
TALER_MERCHANT_template_get_cancel (
struct TALER_MERCHANT_TemplateGetHandle *tgh)
{
if (NULL != tgh->job)
GNUNET_CURL_job_cancel (tgh->job);
GNUNET_free (tgh->url);
GNUNET_free (tgh);
}
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