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exchange/src/lib/exchange_api_reserves_open.c
Christian Grothoff a3dd7ad999
-ref bug
2022-11-03 22:19:41 +01:00

503 lines
14 KiB
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_open.c
* @brief Implementation of the POST /reserves/$RESERVE_PUB/open requests
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP open codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A /reserves/$RID/open Handle
*/
struct TALER_EXCHANGE_ReservesOpenHandle
{
/**
* 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_ReservesOpenCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Public key of the reserve we are querying.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* Our signature.
*/
struct TALER_ReserveSignatureP reserve_sig;
/**
* When did we make the request.
*/
struct GNUNET_TIME_Timestamp ts;
};
/**
* We received an #MHD_HTTP_OK open code. Handle the JSON
* response.
*
* @param roh handle of the request
* @param j JSON response
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
handle_reserves_open_ok (struct TALER_EXCHANGE_ReservesOpenHandle *roh,
const json_t *j)
{
struct TALER_EXCHANGE_ReserveOpenResult rs = {
.hr.reply = j,
.hr.http_status = MHD_HTTP_OK,
};
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount_any ("open_cost",
&rs.details.ok.open_cost),
GNUNET_JSON_spec_timestamp ("reserve_expiration",
&rs.details.ok.expiration_time),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL,
NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
roh->cb (roh->cb_cls,
&rs);
roh->cb = NULL;
GNUNET_JSON_parse_free (spec);
return GNUNET_OK;
}
/**
* We received an #MHD_HTTP_PAYMENT_REQUIRED open code. Handle the JSON
* response.
*
* @param roh handle of the request
* @param j JSON response
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
handle_reserves_open_pr (struct TALER_EXCHANGE_ReservesOpenHandle *roh,
const json_t *j)
{
struct TALER_EXCHANGE_ReserveOpenResult rs = {
.hr.reply = j,
.hr.http_status = MHD_HTTP_PAYMENT_REQUIRED,
};
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount_any ("open_cost",
&rs.details.payment_required.open_cost),
GNUNET_JSON_spec_timestamp ("reserve_expiration",
&rs.details.payment_required.expiration_time),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL,
NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
roh->cb (roh->cb_cls,
&rs);
roh->cb = NULL;
GNUNET_JSON_parse_free (spec);
return GNUNET_OK;
}
/**
* We received an #MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS open code. Handle the JSON
* response.
*
* @param roh handle of the request
* @param j JSON response
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
handle_reserves_open_kyc (struct TALER_EXCHANGE_ReservesOpenHandle *roh,
const json_t *j)
{
struct TALER_EXCHANGE_ReserveOpenResult rs = {
.hr.reply = j,
.hr.http_status = MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS,
};
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto (
"h_payto",
&rs.details.unavailable_for_legal_reasons.h_payto),
GNUNET_JSON_spec_uint64 (
"requirement_row",
&rs.details.unavailable_for_legal_reasons.requirement_row),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL,
NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
roh->cb (roh->cb_cls,
&rs);
roh->cb = NULL;
GNUNET_JSON_parse_free (spec);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /reserves/$RID/open request.
*
* @param cls the `struct TALER_EXCHANGE_ReservesOpenHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_reserves_open_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_ReservesOpenHandle *roh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_ReserveOpenResult rs = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code
};
roh->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_open_ok (roh,
j))
{
GNUNET_break_op (0);
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);
json_dumpf (j,
stderr,
JSON_INDENT (2));
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_PAYMENT_REQUIRED:
if (GNUNET_OK !=
handle_reserves_open_pr (roh,
j))
{
GNUNET_break_op (0);
rs.hr.http_status = 0;
rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
}
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_CONFLICT:
// FIXME: not yet specified (#7428), but needed in
// case of double-spending or insufficient
// reserve balance!
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
if (GNUNET_OK !=
handle_reserves_open_kyc (roh,
j))
{
GNUNET_break_op (0);
rs.hr.http_status = 0;
rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
}
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 open\n",
(unsigned int) response_code,
(int) rs.hr.ec);
break;
}
if (NULL != roh->cb)
{
roh->cb (roh->cb_cls,
&rs);
roh->cb = NULL;
}
TALER_EXCHANGE_reserves_open_cancel (roh);
}
struct TALER_EXCHANGE_ReservesOpenHandle *
TALER_EXCHANGE_reserves_open (
struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct TALER_Amount *reserve_contribution,
unsigned int coin_payments_length,
const struct TALER_EXCHANGE_PurseDeposit *coin_payments,
struct GNUNET_TIME_Timestamp expiration_time,
uint32_t min_purses,
TALER_EXCHANGE_ReservesOpenCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_ReservesOpenHandle *roh;
struct GNUNET_CURL_Context *ctx;
CURL *eh;
char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
const struct TALER_EXCHANGE_Keys *keys;
json_t *cpa;
if (GNUNET_YES !=
TEAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
roh = GNUNET_new (struct TALER_EXCHANGE_ReservesOpenHandle);
roh->exchange = exchange;
roh->cb = cb;
roh->cb_cls = cb_cls;
roh->ts = GNUNET_TIME_timestamp_get ();
GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
&roh->reserve_pub.eddsa_pub);
{
char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (
&roh->reserve_pub,
sizeof (roh->reserve_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"/reserves/%s/open",
pub_str);
}
roh->url = TEAH_path_to_url (exchange,
arg_str);
if (NULL == roh->url)
{
GNUNET_free (roh);
return NULL;
}
eh = TALER_EXCHANGE_curl_easy_get_ (roh->url);
if (NULL == eh)
{
GNUNET_break (0);
GNUNET_free (roh->url);
GNUNET_free (roh);
return NULL;
}
keys = TALER_EXCHANGE_get_keys (exchange);
if (NULL == keys)
{
GNUNET_break (0);
curl_easy_cleanup (eh);
GNUNET_free (roh->url);
GNUNET_free (roh);
return NULL;
}
TALER_wallet_reserve_open_sign (reserve_contribution,
roh->ts,
expiration_time,
min_purses,
reserve_priv,
&roh->reserve_sig);
cpa = json_array ();
GNUNET_assert (NULL != cpa);
for (unsigned int i = 0; i<coin_payments_length; i++)
{
const struct TALER_EXCHANGE_PurseDeposit *pd = &coin_payments[i];
struct TALER_CoinSpendSignatureP coin_sig;
struct TALER_CoinSpendPublicKeyP coin_pub;
const struct TALER_AgeCommitmentProof *acp = pd->age_commitment_proof;
struct TALER_AgeCommitmentHash ahac;
struct TALER_AgeCommitmentHash *achp = NULL;
json_t *cp;
if (NULL != acp)
{
TALER_age_commitment_hash (&acp->commitment,
&ahac);
achp = &ahac;
}
TALER_wallet_reserve_open_deposit_sign (&pd->amount,
&roh->reserve_sig,
&pd->coin_priv,
&coin_sig);
GNUNET_CRYPTO_eddsa_key_get_public (&pd->coin_priv.eddsa_priv,
&coin_pub.eddsa_pub);
cp = GNUNET_JSON_PACK (
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_data_auto ("h_age_commitment",
achp)),
TALER_JSON_pack_amount ("amount",
&pd->amount),
GNUNET_JSON_pack_data_auto ("denom_pub_hash",
&pd->h_denom_pub),
TALER_JSON_pack_denom_sig ("ub_sig",
&pd->denom_sig),
GNUNET_JSON_pack_data_auto ("coin_pub",
&coin_pub),
GNUNET_JSON_pack_data_auto ("coin_sig",
&coin_sig));
GNUNET_assert (0 ==
json_array_append_new (cpa,
cp));
}
{
json_t *open_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_timestamp ("request_timestamp",
roh->ts),
GNUNET_JSON_pack_timestamp ("reserve_expiration",
expiration_time),
GNUNET_JSON_pack_array_steal ("payments",
cpa),
TALER_JSON_pack_amount ("reserve_payment",
reserve_contribution),
GNUNET_JSON_pack_uint64 ("purse_limit",
min_purses),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&roh->reserve_sig));
if (GNUNET_OK !=
TALER_curl_easy_post (&roh->post_ctx,
eh,
open_obj))
{
GNUNET_break (0);
curl_easy_cleanup (eh);
json_decref (open_obj);
GNUNET_free (roh->url);
GNUNET_free (roh);
return NULL;
}
json_decref (open_obj);
}
ctx = TEAH_handle_to_context (exchange);
roh->job = GNUNET_CURL_job_add2 (ctx,
eh,
roh->post_ctx.headers,
&handle_reserves_open_finished,
roh);
return roh;
}
void
TALER_EXCHANGE_reserves_open_cancel (
struct TALER_EXCHANGE_ReservesOpenHandle *roh)
{
if (NULL != roh->job)
{
GNUNET_CURL_job_cancel (roh->job);
roh->job = NULL;
}
TALER_curl_easy_post_finished (&roh->post_ctx);
GNUNET_free (roh->url);
GNUNET_free (roh);
}
/* end of exchange_api_reserves_open.c */
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