/*
This file is part of TALER
Copyright (C) 2014-2017 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_keystate.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 int
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)
};
TALER_amount_hton (&cw.coin_contribution,
coin_contribution);
if (GNUNET_OK !=
TEH_KS_sign (&cw.purpose,
&pub,
&sig))
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
return TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:o, s:o, s:o}",
"wtid", GNUNET_JSON_from_data_auto (
wtid),
"execution_time",
GNUNET_JSON_from_time_abs (exec_time),
"coin_contribution",
TALER_JSON_from_amount (
coin_contribution),
"exchange_sig",
GNUNET_JSON_from_data_auto (&sig),
"exchange_pub",
GNUNET_JSON_from_data_auto (&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;
/**
* 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.
*/
int pending;
};
/**
* Function called with the results of the lookup of the
* wire transfer identifier information.
*
* @param cls our context for transmission, a `struct DepositWtidContext *`
* @param wtid raw wire transfer identifier, NULL
* if the transaction was not yet done
* @param coin_contribution how much did the coin we asked about
* contribute to the total transfer value? (deposit value including fee)
* @param coin_fee how much did the exchange charge for the deposit fee
* @param execution_time when was the transaction done, or
* when we expect it to be done (if @a wtid was NULL);
* #GNUNET_TIME_UNIT_FOREVER_ABS if the /deposit is unknown
* to the exchange
*/
static void
handle_wtid_data (void *cls,
const struct TALER_WireTransferIdentifierRawP *wtid,
const struct TALER_Amount *coin_contribution,
const struct TALER_Amount *coin_fee,
struct GNUNET_TIME_Absolute execution_time)
{
struct DepositWtidContext *ctx = cls;
if (NULL == wtid)
{
ctx->pending = GNUNET_YES;
ctx->execution_time = execution_time;
return;
}
if (GNUNET_SYSERR ==
TALER_amount_subtract (&ctx->coin_delta,
coin_contribution,
coin_fee))
{
GNUNET_break (0);
ctx->pending = GNUNET_SYSERR;
return;
}
ctx->wtid = *wtid;
ctx->execution_time = execution_time;
ctx->coin_contribution = *coin_contribution;
ctx->coin_fee = *coin_fee;
}
/**
* 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 session database session to use
* @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,
struct TALER_EXCHANGEDB_Session *session,
int *mhd_ret)
{
struct DepositWtidContext *ctx = cls;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->lookup_transfer_by_deposit (TEH_plugin->cls,
session,
&ctx->tps->h_contract_terms,
&ctx->tps->h_wire,
&ctx->tps->coin_pub,
ctx->merchant_pub,
&handle_wtid_data,
ctx);
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_DEPOSITS_GET_DB_FETCH_FAILED,
"failed to fetch transaction data");
}
return qs;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_DEPOSITS_GET_NOT_FOUND,
"transaction unknown");
return GNUNET_DB_STATUS_HARD_ERROR;
}
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 int
handle_track_transaction_request (
struct MHD_Connection *connection,
const struct TALER_DepositTrackPS *tps,
const struct TALER_MerchantPublicKeyP *merchant_pub)
{
int mhd_ret;
struct DepositWtidContext ctx = {
.pending = GNUNET_NO,
.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_YES == ctx.pending)
return TALER_MHD_reply_json_pack (connection,
MHD_HTTP_ACCEPTED,
"{s:o}",
"execution_time",
GNUNET_JSON_from_time_abs (
ctx.execution_time));
if (GNUNET_SYSERR == ctx.pending)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_DEPOSITS_GET_DB_FEE_INCONSISTENT,
"fees are inconsistent");
return reply_deposit_details (connection,
&tps->h_contract_terms,
&tps->h_wire,
&tps->coin_pub,
&ctx.coin_delta,
&ctx.wtid,
ctx.execution_time);
}
/**
* Handle a "/deposits/$H_WIRE/$MERCHANT_PUB/$H_CONTRACT_TERMS/$COIN_PUB"
* request.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param args array of additional options (length: 4, contains:
* h_wire, merchant_pub, h_contract_terms and coin_pub)
* @return MHD result code
*/
int
TEH_handler_deposits_get (const struct TEH_RequestHandler *rh,
struct MHD_Connection *connection,
const char *const args[4])
{
int res;
struct TALER_MerchantSignatureP merchant_sig;
struct TALER_DepositTrackPS tps = {
.purpose.size = htonl (sizeof (tps)),
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION)
};
(void) rh;
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 (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_DEPOSITS_INVALID_H_WIRE,
"wire hash malformed");
}
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 (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_DEPOSITS_INVALID_MERCHANT_PUB,
"merchant public key malformed");
}
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 (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_DEPOSITS_INVALID_H_CONTRACT_TERMS,
"contract terms hash malformed");
}
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 (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_DEPOSITS_INVALID_COIN_PUB,
"coin public key malformed");
}
res = TALER_MHD_parse_request_arg_data (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.purpose,
&merchant_sig.eddsa_sig,
&tps.merchant.eddsa_pub))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSITS_GET_MERCHANT_SIGNATURE_INVALID,
"merchant_sig");
}
return handle_track_transaction_request (connection,
&tps,
&tps.merchant);
}
/* end of taler-exchange-httpd_deposits_get.c */