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exchange/src/lib/exchange_api_deposits_get.c

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/*
This file is part of TALER
Copyright (C) 2014-2021 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_deposits_get.c
* @brief Implementation of the /deposits/ GET request
* @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 "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A Deposit Get Handle
*/
struct TALER_EXCHANGE_DepositGetHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Context for #TEH_curl_easy_post(). Keeps the data that must
* persist for Curl to make the upload.
*/
struct TALER_CURL_PostContext ctx;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_DepositGetCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Hash over the wiring information of the merchant.
*/
struct TALER_MerchantWireHashP h_wire;
/**
* Hash over the contract for which this deposit is made.
*/
struct TALER_PrivateContractHashP h_contract_terms;
/**
* Raw value (binary encoding) of the wire transfer subject.
*/
struct TALER_WireTransferIdentifierRawP wtid;
/**
* The coin's public key. This is the value that must have been
* signed (blindly) by the Exchange.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* When did the exchange execute this transfer? Note that the
* timestamp may not be exactly the same on the wire, i.e.
* because the wire has a different timezone or resolution.
*/
struct GNUNET_TIME_Timestamp execution_time;
/**
* The contribution of @e coin_pub to the total transfer volume.
* This is the value of the deposit minus the fee.
*/
struct TALER_Amount coin_contribution;
};
/**
* Verify that the signature on the "200 OK" response
* from the exchange is valid.
*
* @param dwh deposit wtid handle
* @param exchange_pub the exchange's public key
* @param exchange_sig the exchange's signature
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
// FIXME: inline...
static enum GNUNET_GenericReturnValue
verify_deposit_wtid_signature_ok (
const struct TALER_EXCHANGE_DepositGetHandle *dwh,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_ExchangeSignatureP *exchange_sig)
{
const struct TALER_EXCHANGE_Keys *key_state;
key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
TALER_exchange_online_confirm_wire_verify (
&dwh->h_wire,
&dwh->h_contract_terms,
&dwh->wtid,
&dwh->coin_pub,
dwh->execution_time,
&dwh->coin_contribution,
exchange_pub,
exchange_sig))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transaction request.
*
* @param cls the `struct TALER_EXCHANGE_DepositGetHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_deposit_wtid_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_DepositGetHandle *dwh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_GetDepositResponse dr = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code
};
dwh->job = NULL;
switch (response_code)
{
case 0:
dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("wtid",
&dr.details.success.wtid),
GNUNET_JSON_spec_timestamp ("execution_time",
&dr.details.success.execution_time),
TALER_JSON_spec_amount_any ("coin_contribution",
&dr.details.success.coin_contribution),
GNUNET_JSON_spec_fixed_auto ("exchange_sig",
&dr.details.success.exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub",
&dr.details.success.exchange_pub),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
// FIXME: remove once we inline function below...
dwh->execution_time = dr.details.success.execution_time;
dwh->wtid = dr.details.success.wtid;
dwh->coin_contribution = dr.details.success.coin_contribution;
if (GNUNET_OK !=
verify_deposit_wtid_signature_ok (dwh,
&dr.details.success.exchange_pub,
&dr.details.success.exchange_sig))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_EXCHANGE_DEPOSITS_GET_INVALID_SIGNATURE_BY_EXCHANGE;
break;
}
dwh->cb (dwh->cb_cls,
&dr);
TALER_EXCHANGE_deposits_get_cancel (dwh);
return;
}
case MHD_HTTP_ACCEPTED:
{
/* Transaction known, but not executed yet */
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_timestamp ("execution_time",
&dr.details.accepted.execution_time),
GNUNET_JSON_spec_uint64 ("payment_target_uuid",
&dr.details.accepted.payment_target_uuid),
GNUNET_JSON_spec_bool ("kyc_ok",
&dr.details.accepted.kyc_ok),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
dwh->cb (dwh->cb_cls,
&dr);
TALER_EXCHANGE_deposits_get_cancel (dwh);
return;
}
case MHD_HTTP_BAD_REQUEST:
dr.hr.ec = TALER_JSON_get_error_code (j);
dr.hr.hint = TALER_JSON_get_error_hint (j);
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
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);
/* Exchange does not know about transaction;
we should pass the reply to the application */
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 GET deposits\n",
(unsigned int) response_code,
(int) dr.hr.ec);
GNUNET_break_op (0);
break;
}
dwh->cb (dwh->cb_cls,
&dr);
TALER_EXCHANGE_deposits_get_cancel (dwh);
}
struct TALER_EXCHANGE_DepositGetHandle *
TALER_EXCHANGE_deposits_get (
struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_MerchantPrivateKeyP *merchant_priv,
const struct TALER_MerchantWireHashP *h_wire,
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
TALER_EXCHANGE_DepositGetCallback cb,
void *cb_cls)
{
struct TALER_MerchantPublicKeyP merchant;
struct TALER_MerchantSignatureP merchant_sig;
struct TALER_EXCHANGE_DepositGetHandle *dwh;
struct GNUNET_CURL_Context *ctx;
CURL *eh;
char arg_str[(sizeof (struct TALER_CoinSpendPublicKeyP)
+ sizeof (struct TALER_MerchantWireHashP)
+ sizeof (struct TALER_MerchantPublicKeyP)
+ sizeof (struct TALER_PrivateContractHashP)
+ sizeof (struct TALER_MerchantSignatureP)) * 2 + 48];
if (GNUNET_YES !=
TEAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
&merchant.eddsa_pub);
TALER_merchant_deposit_sign (h_contract_terms,
h_wire,
coin_pub,
&merchant,
merchant_priv,
&merchant_sig);
{
char cpub_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2];
char mpub_str[sizeof (struct TALER_MerchantPublicKeyP) * 2];
char msig_str[sizeof (struct TALER_MerchantSignatureP) * 2];
char chash_str[sizeof (struct TALER_PrivateContractHashP) * 2];
char whash_str[sizeof (struct TALER_MerchantWireHashP) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (h_wire,
sizeof (*h_wire),
whash_str,
sizeof (whash_str));
*end = '\0';
end = GNUNET_STRINGS_data_to_string (&merchant,
sizeof (merchant),
mpub_str,
sizeof (mpub_str));
*end = '\0';
end = GNUNET_STRINGS_data_to_string (h_contract_terms,
sizeof (*h_contract_terms),
chash_str,
sizeof (chash_str));
*end = '\0';
end = GNUNET_STRINGS_data_to_string (coin_pub,
sizeof (*coin_pub),
cpub_str,
sizeof (cpub_str));
*end = '\0';
end = GNUNET_STRINGS_data_to_string (&merchant_sig,
sizeof (merchant_sig),
msig_str,
sizeof (msig_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"/deposits/%s/%s/%s/%s?merchant_sig=%s",
whash_str,
mpub_str,
chash_str,
cpub_str,
msig_str);
}
dwh = GNUNET_new (struct TALER_EXCHANGE_DepositGetHandle);
dwh->exchange = exchange;
dwh->cb = cb;
dwh->cb_cls = cb_cls;
dwh->url = TEAH_path_to_url (exchange,
arg_str);
if (NULL == dwh->url)
{
GNUNET_free (dwh);
return NULL;
}
dwh->h_wire = *h_wire;
dwh->h_contract_terms = *h_contract_terms;
dwh->coin_pub = *coin_pub;
eh = TALER_EXCHANGE_curl_easy_get_ (dwh->url);
if (NULL == eh)
{
GNUNET_break (0);
GNUNET_free (dwh->url);
GNUNET_free (dwh);
return NULL;
}
ctx = TEAH_handle_to_context (exchange);
dwh->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_deposit_wtid_finished,
dwh);
return dwh;
}
void
TALER_EXCHANGE_deposits_get_cancel (struct TALER_EXCHANGE_DepositGetHandle *dwh)
{
if (NULL != dwh->job)
{
GNUNET_CURL_job_cancel (dwh->job);
dwh->job = NULL;
}
GNUNET_free (dwh->url);
TALER_curl_easy_post_finished (&dwh->ctx);
GNUNET_free (dwh);
}
/* end of exchange_api_deposits_get.c */
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