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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 General Public License as published by the Free Software
Foundation; either version 3, 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/exchange_api_purse_delete.c
* @brief Implementation of the client to delete a purse
* into an account
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_json_lib.h"
#include "taler_exchange_service.h"
#include "exchange_api_handle.h"
#include "exchange_api_common.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A purse delete with deposit handle
*/
struct TALER_EXCHANGE_PurseDeleteHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_PurseDeleteCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Header with the purse_sig.
*/
struct curl_slist *xhdr;
};
/**
* Function called when we're done processing the
* HTTP DELETE /purse/$PID request.
*
* @param cls the `struct TALER_EXCHANGE_PurseDeleteHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_purse_delete_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_PurseDeleteHandle *pdh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_PurseDeleteResponse dr = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code
};
pdh->job = NULL;
switch (response_code)
{
case 0:
dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_NO_CONTENT:
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_FORBIDDEN:
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
/* Nothing really to verify, exchange says one of the signatures is
invalid; as we checked them, this should never happen, we
should pass the JSON reply to the application */
break;
case MHD_HTTP_NOT_FOUND:
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
/* Nothing really to verify, this should never
happen, we should pass the JSON reply to the application */
break;
case MHD_HTTP_CONFLICT:
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d for exchange deposit\n",
(unsigned int) response_code,
dr.hr.ec);
GNUNET_break_op (0);
break;
}
pdh->cb (pdh->cb_cls,
&dr);
TALER_EXCHANGE_purse_delete_cancel (pdh);
}
struct TALER_EXCHANGE_PurseDeleteHandle *
TALER_EXCHANGE_purse_delete (
struct GNUNET_CURL_Context *ctx,
const char *url,
const struct TALER_PurseContractPrivateKeyP *purse_priv,
TALER_EXCHANGE_PurseDeleteCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_PurseDeleteHandle *pdh;
CURL *eh;
struct TALER_PurseContractPublicKeyP purse_pub;
struct TALER_PurseContractSignatureP purse_sig;
char arg_str[sizeof (purse_pub) * 2 + 32];
pdh = GNUNET_new (struct TALER_EXCHANGE_PurseDeleteHandle);
pdh->cb = cb;
pdh->cb_cls = cb_cls;
GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv,
&purse_pub.eddsa_pub);
{
char pub_str[sizeof (purse_pub) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (&purse_pub,
sizeof (purse_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"purses/%s",
pub_str);
}
pdh->url = TALER_url_join (url,
arg_str,
NULL);
if (NULL == pdh->url)
{
GNUNET_break (0);
GNUNET_free (pdh);
return NULL;
}
TALER_wallet_purse_delete_sign (purse_priv,
&purse_sig);
{
char *delete_str;
char *xhdr;
delete_str =
GNUNET_STRINGS_data_to_string_alloc (&purse_sig,
sizeof (purse_sig));
GNUNET_asprintf (&xhdr,
"Taler-Purse-Signature: %s",
delete_str);
GNUNET_free (delete_str);
pdh->xhdr = curl_slist_append (NULL,
xhdr);
GNUNET_free (xhdr);
}
eh = TALER_EXCHANGE_curl_easy_get_ (pdh->url);
if (NULL == eh)
{
GNUNET_break (0);
curl_slist_free_all (pdh->xhdr);
GNUNET_free (pdh->url);
GNUNET_free (pdh);
return NULL;
}
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_CUSTOMREQUEST,
MHD_HTTP_METHOD_DELETE));
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"URL for purse delete: `%s'\n",
pdh->url);
pdh->job = GNUNET_CURL_job_add2 (ctx,
eh,
pdh->xhdr,
&handle_purse_delete_finished,
pdh);
return pdh;
}
void
TALER_EXCHANGE_purse_delete_cancel (
struct TALER_EXCHANGE_PurseDeleteHandle *pdh)
{
if (NULL != pdh->job)
{
GNUNET_CURL_job_cancel (pdh->job);
pdh->job = NULL;
}
curl_slist_free_all (pdh->xhdr);
GNUNET_free (pdh->url);
GNUNET_free (pdh);
}
/* end of exchange_api_purse_delete.c */
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