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exchange/src/lib/exchange_api_reserves_history.c

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/*
This file is part of TALER
Copyright (C) 2014-2022 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_reserves_history.c
* @brief Implementation of the POST /reserves/$RESERVE_PUB/history requests
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP history codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A /reserves/$RID/history Handle
*/
struct TALER_EXCHANGE_ReservesHistoryHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Context for #TEH_curl_easy_post(). Keeps the data that must
* persist for Curl to make the upload.
*/
struct TALER_CURL_PostContext post_ctx;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_ReservesHistoryCallback cb;
/**
* Public key of the reserve we are querying.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* Closure for @a cb.
*/
void *cb_cls;
};
/**
* We received an #MHD_HTTP_OK history code. Handle the JSON
* response.
*
* @param rsh handle of the request
* @param j JSON response
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
handle_reserves_history_ok (struct TALER_EXCHANGE_ReservesHistoryHandle *rsh,
const json_t *j)
{
json_t *history;
unsigned int len;
struct TALER_EXCHANGE_ReserveHistory rs = {
.hr.reply = j,
.hr.http_status = MHD_HTTP_OK
};
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount_any ("balance",
&rs.details.ok.balance),
GNUNET_JSON_spec_bool ("kyc_passed",
&rs.details.ok.kyc_ok),
GNUNET_JSON_spec_bool ("kyc_required",
&rs.details.ok.kyc_required),
GNUNET_JSON_spec_json ("history",
&history),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL,
NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
len = json_array_size (history);
{
struct TALER_EXCHANGE_ReserveHistoryEntry *rhistory;
rhistory = GNUNET_new_array (len,
struct TALER_EXCHANGE_ReserveHistoryEntry);
if (GNUNET_OK !=
TALER_EXCHANGE_parse_reserve_history (rsh->exchange,
history,
&rsh->reserve_pub,
rs.details.ok.balance.currency,
&rs.details.ok.total_in,
&rs.details.ok.total_out,
len,
rhistory))
{
GNUNET_break_op (0);
TALER_EXCHANGE_free_reserve_history (rhistory,
len);
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
if (NULL != rsh->cb)
{
rs.details.ok.history = rhistory;
rs.details.ok.history_len = len;
rsh->cb (rsh->cb_cls,
&rs);
rsh->cb = NULL;
}
TALER_EXCHANGE_free_reserve_history (rhistory,
len);
}
GNUNET_JSON_parse_free (spec);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /reserves/$RID/history request.
*
* @param cls the `struct TALER_EXCHANGE_ReservesHistoryHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_reserves_history_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_ReservesHistoryHandle *rsh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_ReserveHistory rs = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code
};
rsh->job = NULL;
switch (response_code)
{
case 0:
rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
if (GNUNET_OK !=
handle_reserves_history_ok (rsh,
j))
{
rs.hr.http_status = 0;
rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
}
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 */
GNUNET_break (0);
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_FORBIDDEN:
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
GNUNET_break (0);
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify, this should never
happen, we should pass the JSON reply to the application */
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
default:
/* unexpected response code */
GNUNET_break_op (0);
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d for reserves history\n",
(unsigned int) response_code,
(int) rs.hr.ec);
break;
}
if (NULL != rsh->cb)
{
rsh->cb (rsh->cb_cls,
&rs);
rsh->cb = NULL;
}
TALER_EXCHANGE_reserves_history_cancel (rsh);
}
struct TALER_EXCHANGE_ReservesHistoryHandle *
TALER_EXCHANGE_reserves_history (
struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_ReservePrivateKeyP *reserve_priv,
TALER_EXCHANGE_ReservesHistoryCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_ReservesHistoryHandle *rsh;
struct GNUNET_CURL_Context *ctx;
CURL *eh;
char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
struct TALER_ReserveSignatureP reserve_sig;
struct GNUNET_TIME_Timestamp ts
= GNUNET_TIME_timestamp_get ();
if (GNUNET_YES !=
TEAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
rsh = GNUNET_new (struct TALER_EXCHANGE_ReservesHistoryHandle);
rsh->exchange = exchange;
rsh->cb = cb;
rsh->cb_cls = cb_cls;
GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
&rsh->reserve_pub.eddsa_pub);
{
char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (
&rsh->reserve_pub,
sizeof (rsh->reserve_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"/reserves/%s/history",
pub_str);
}
rsh->url = TEAH_path_to_url (exchange,
arg_str);
if (NULL == rsh->url)
{
GNUNET_free (rsh);
return NULL;
}
eh = TALER_EXCHANGE_curl_easy_get_ (rsh->url);
if (NULL == eh)
{
GNUNET_break (0);
GNUNET_free (rsh->url);
GNUNET_free (rsh);
return NULL;
}
TALER_wallet_reserve_history_sign (ts,
NULL, /* FIXME: fee! */
reserve_priv,
&reserve_sig);
{
json_t *history_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_timestamp ("request_timestamp",
ts),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&reserve_sig));
if (GNUNET_OK !=
TALER_curl_easy_post (&rsh->post_ctx,
eh,
history_obj))
{
GNUNET_break (0);
curl_easy_cleanup (eh);
json_decref (history_obj);
GNUNET_free (rsh->url);
GNUNET_free (rsh);
return NULL;
}
json_decref (history_obj);
}
ctx = TEAH_handle_to_context (exchange);
rsh->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_reserves_history_finished,
rsh);
return rsh;
}
void
TALER_EXCHANGE_reserves_history_cancel (
struct TALER_EXCHANGE_ReservesHistoryHandle *rsh)
{
if (NULL != rsh->job)
{
GNUNET_CURL_job_cancel (rsh->job);
rsh->job = NULL;
}
TALER_curl_easy_post_finished (&rsh->post_ctx);
GNUNET_free (rsh->url);
GNUNET_free (rsh);
}
/* end of exchange_api_reserves_history.c */
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