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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 GNUnet e.V. and INRIA
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_map.c
* @brief Implementation of the /map/{in,out} request of the merchant's HTTP API
* @author Marcello Stanisci
*/
#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>
/**
* This structure acts like a "handle" for both /map/in and
* /map/out operations, as they only differ about the 'json_enc'
* field (which is just left NULL when not needed).
*/
struct TALER_MERCHANT_MapOperation
{
/**
* Full URI, includes "/map/in".
*/
char *url;
/**
* Request's body. Left NULL in case of /map/out.
*/
char *json_enc;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_MapOperationCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Cancel a /map/{in,out} request.
*
* @param mio handle to the request to be canceled
*/
void
TALER_MERCHANT_map_cancel (struct TALER_MERCHANT_MapOperation *mo)
{
if (NULL != mo->job)
{
GNUNET_CURL_job_cancel (mo->job);
mo->job = NULL;
}
GNUNET_free (mo->url);
GNUNET_free_non_null (mo->json_enc);
GNUNET_free (mo);
}
/**
* Function called when we're done processing the HTTP /map/{in,out} request.
*
* @param cls the `struct TALER_MERCHANT_MapInOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, should be NULL
*/
static void
handle_map_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_MERCHANT_MapOperation *mo = cls;
/**
* As no data is supposed to be extracted from this
* call, we just invoke the provided callback from here.
*/
mo->cb (mo->cb_cls,
response_code,
json);
}
/**
* Issue a /map/out request to the backend.
*
* @param ctx execution context
* @param backend_uri base URL of the merchant backend
* @param h_contract hashcode of `contract`
* @param map_in_cb callback which will work the response gotten from the backend
* @param map_in_cb_cls closure to pass to @a history_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_MapOperation *
TALER_MERCHANT_map_out (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const struct GNUNET_HashCode *h_contract,
TALER_MERCHANT_MapOperationCallback map_cb,
void *map_cb_cls)
{
struct TALER_MERCHANT_MapOperation *mo;
CURL *eh;
char *hash_enc;
mo = GNUNET_new (struct TALER_MERCHANT_MapOperation);
mo->ctx = ctx;
mo->cb = map_cb;
mo->cb_cls = map_cb_cls;
hash_enc = GNUNET_STRINGS_data_to_string_alloc (h_contract,
sizeof (struct GNUNET_HashCode));
GNUNET_asprintf (&mo->url,
"%s/map/out?h_contract=%s",
backend_uri,
hash_enc);
eh = curl_easy_init ();
if (CURLE_OK != curl_easy_setopt (eh,
CURLOPT_URL,
mo->url))
{
GNUNET_break (0);
return NULL;
}
if (NULL == (mo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_map_finished,
mo)))
{
GNUNET_break (0);
return NULL;
}
return mo;
}
/**
* Issue a /map/in request to the backend.
*
* @param ctx execution context
* @param backend_uri base URL of the merchant backend
* @param contract contract to store
* @param h_contract hashcode of `contract`
* @param map_in_cb callback which will work the response gotten from the backend
* @param map_in_cb_cls closure to pass to @a history_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_MapOperation *
TALER_MERCHANT_map_in (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const json_t *contract,
const struct GNUNET_HashCode *h_contract,
TALER_MERCHANT_MapOperationCallback map_cb,
void *map_cb_cls)
{
struct TALER_MERCHANT_MapOperation *mo;
CURL *eh;
json_t *req;
mo = GNUNET_new (struct TALER_MERCHANT_MapOperation);
mo->ctx = ctx;
mo->cb = map_cb;
mo->cb_cls = map_cb_cls;
GNUNET_asprintf (&mo->url,
"%s%s",
backend_uri,
"/map/in");
// build final json
req = json_pack ("{s:o, s:o}",
"contract", contract,
"h_contract", GNUNET_JSON_from_data_auto (h_contract));
GNUNET_assert (NULL !=
(mo->json_enc = json_dumps (req, JSON_COMPACT))
);
json_decref (req);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
mo->url));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDS,
mo->json_enc));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDSIZE,
strlen (mo->json_enc)));
mo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_map_finished,
mo);
return mo;
}
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