/*
This file is part of TALER
Copyright (C) 2014-2017, 2021 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file taler-exchange-httpd_deposits_get.c
* @brief Handle wire deposit tracking-related requests
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler_signatures.h"
#include "taler-exchange-httpd_keys.h"
#include "taler-exchange-httpd_deposits_get.h"
#include "taler-exchange-httpd_responses.h"
/**
* A merchant asked for details about a deposit. Provide
* them. Generates the 200 reply.
*
* @param connection connection to the client
* @param h_contract_terms hash of the contract
* @param h_wire hash of wire account details
* @param coin_pub public key of the coin
* @param coin_contribution how much did the coin we asked about
* contribute to the total transfer value? (deposit value minus fee)
* @param wtid raw wire transfer identifier
* @param exec_time execution time of the wire transfer
* @return MHD result code
*/
static MHD_RESULT
reply_deposit_details (struct MHD_Connection *connection,
const struct GNUNET_HashCode *h_contract_terms,
const struct GNUNET_HashCode *h_wire,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *coin_contribution,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute exec_time)
{
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
struct TALER_ConfirmWirePS cw = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE),
.purpose.size = htonl (sizeof (cw)),
.h_wire = *h_wire,
.h_contract_terms = *h_contract_terms,
.wtid = *wtid,
.coin_pub = *coin_pub,
.execution_time = GNUNET_TIME_absolute_hton (exec_time)
};
enum TALER_ErrorCode ec;
TALER_amount_hton (&cw.coin_contribution,
coin_contribution);
if (TALER_EC_NONE !=
(ec = TEH_keys_exchange_sign (&cw,
&pub,
&sig)))
{
return TALER_MHD_reply_with_ec (connection,
ec,
NULL);
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_data_auto ("wtid",
wtid),
GNUNET_JSON_pack_time_abs ("execution_time",
exec_time),
TALER_JSON_pack_amount ("coin_contribution",
coin_contribution),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&sig),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&pub));
}
/**
* Closure for #handle_wtid_data.
*/
struct DepositWtidContext
{
/**
* Deposit details.
*/
const struct TALER_DepositTrackPS *tps;
/**
* Public key of the merchant.
*/
const struct TALER_MerchantPublicKeyP *merchant_pub;
/**
* Set by #handle_wtid data to the wire transfer ID.
*/
struct TALER_WireTransferIdentifierRawP wtid;
/**
* Set by #handle_wtid data to the coin's contribution to the wire transfer.
*/
struct TALER_Amount coin_contribution;
/**
* Set by #handle_wtid data to the fee charged to the coin.
*/
struct TALER_Amount coin_fee;
/**
* Set by #handle_wtid data to the wire transfer execution time.
*/
struct GNUNET_TIME_Absolute execution_time;
/**
* Set by #handle_wtid to the coin contribution to the transaction
* (that is, @e coin_contribution minus @e coin_fee).
*/
struct TALER_Amount coin_delta;
/**
* KYC status information for the receiving account.
*/
struct TALER_EXCHANGEDB_KycStatus kyc;
/**
* Set to #GNUNET_YES by #handle_wtid if the wire transfer is still pending
* (and the above were not set).
* Set to #GNUNET_SYSERR if there was a serious error.
*/
enum GNUNET_GenericReturnValue pending;
};
/**
* Execute a "deposits" GET. Returns the transfer information
* associated with the given deposit.
*
* If it returns a non-error code, the transaction logic MUST
* NOT queue a MHD response. IF it returns an hard error, the
* transaction logic MUST queue a MHD response and set @a mhd_ret. IF
* it returns the soft error code, the function MAY be called again to
* retry and MUST NOT queue a MHD response.
*
* @param cls closure of type `struct DepositWtidContext *`
* @param connection MHD request which triggered the transaction
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
deposits_get_transaction (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct DepositWtidContext *ctx = cls;
enum GNUNET_DB_QueryStatus qs;
bool pending;
struct TALER_Amount fee;
qs = TEH_plugin->lookup_transfer_by_deposit (TEH_plugin->cls,
&ctx->tps->h_contract_terms,
&ctx->tps->h_wire,
&ctx->tps->coin_pub,
ctx->merchant_pub,
&pending,
&ctx->wtid,
&ctx->execution_time,
&ctx->coin_contribution,
&fee,
&ctx->kyc);
if (0 > qs)
{
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_break (0);
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_FETCH_FAILED,
NULL);
}
return qs;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_EXCHANGE_DEPOSITS_GET_NOT_FOUND,
NULL);
return GNUNET_DB_STATUS_HARD_ERROR;
}
if (0 >
TALER_amount_subtract (&ctx->coin_delta,
&ctx->coin_contribution,
&fee))
{
GNUNET_break (0);
ctx->pending = GNUNET_SYSERR;
return qs;
}
ctx->pending = (pending) ? GNUNET_YES : GNUNET_NO;
return qs;
}
/**
* Lookup and return the wire transfer identifier.
*
* @param connection the MHD connection to handle
* @param tps signed request to execute
* @param merchant_pub public key from the merchant
* @return MHD result code
*/
static MHD_RESULT
handle_track_transaction_request (
struct MHD_Connection *connection,
const struct TALER_DepositTrackPS *tps,
const struct TALER_MerchantPublicKeyP *merchant_pub)
{
MHD_RESULT mhd_ret;
struct DepositWtidContext ctx = {
.tps = tps,
.merchant_pub = merchant_pub
};
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"handle deposits GET",
&mhd_ret,
&deposits_get_transaction,
&ctx))
return mhd_ret;
if (GNUNET_SYSERR == ctx.pending)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_INVARIANT_FAILURE,
"wire fees exceed aggregate in database");
if (GNUNET_YES == ctx.pending)
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_ACCEPTED,
GNUNET_JSON_pack_uint64 ("payment_target_uuid",
ctx.kyc.payment_target_uuid),
GNUNET_JSON_pack_bool ("kyc_ok",
ctx.kyc.ok),
GNUNET_JSON_pack_time_abs ("execution_time",
ctx.execution_time));
return reply_deposit_details (connection,
&tps->h_contract_terms,
&tps->h_wire,
&tps->coin_pub,
&ctx.coin_delta,
&ctx.wtid,
ctx.execution_time);
}
MHD_RESULT
TEH_handler_deposits_get (struct TEH_RequestContext *rc,
const char *const args[4])
{
enum GNUNET_GenericReturnValue res;
struct TALER_MerchantSignatureP merchant_sig;
struct TALER_DepositTrackPS tps = {
.purpose.size = htonl (sizeof (tps)),
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION)
};
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[0],
strlen (args[0]),
&tps.h_wire,
sizeof (tps.h_wire)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_DEPOSITS_GET_INVALID_H_WIRE,
args[0]);
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[1],
strlen (args[1]),
&tps.merchant,
sizeof (tps.merchant)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_DEPOSITS_GET_INVALID_MERCHANT_PUB,
args[1]);
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[2],
strlen (args[2]),
&tps.h_contract_terms,
sizeof (tps.h_contract_terms)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_DEPOSITS_GET_INVALID_H_CONTRACT_TERMS,
args[2]);
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[3],
strlen (args[3]),
&tps.coin_pub,
sizeof (tps.coin_pub)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_DEPOSITS_GET_INVALID_COIN_PUB,
args[3]);
}
res = TALER_MHD_parse_request_arg_data (rc->connection,
"merchant_sig",
&merchant_sig,
sizeof (merchant_sig));
if (GNUNET_SYSERR == res)
return MHD_NO; /* internal error */
if (GNUNET_NO == res)
return MHD_YES; /* parse error */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION,
&tps,
&merchant_sig.eddsa_sig,
&tps.merchant.eddsa_pub))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_EXCHANGE_DEPOSITS_GET_MERCHANT_SIGNATURE_INVALID,
NULL);
}
return handle_track_transaction_request (rc->connection,
&tps,
&tps.merchant);
}
/* end of taler-exchange-httpd_deposits_get.c */