/*
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 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_reserves_history.c
* @brief Handle /reserves/$RESERVE_PUB/history requests
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include "taler_mhd_lib.h"
#include "taler_json_lib.h"
#include "taler_dbevents.h"
#include "taler-exchange-httpd_keys.h"
#include "taler-exchange-httpd_reserves_history.h"
#include "taler-exchange-httpd_responses.h"
/**
* How far do we allow a client's time to be off when
* checking the request timestamp?
*/
#define TIMESTAMP_TOLERANCE \
GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
/**
* Closure for #reserve_history_transaction.
*/
struct ReserveHistoryContext
{
/**
* Public key of the reserve the inquiry is about.
*/
const struct TALER_ReservePublicKeyP *reserve_pub;
/**
* Timestamp of the request.
*/
struct GNUNET_TIME_Timestamp timestamp;
/**
* Client signature approving the request.
*/
struct TALER_ReserveSignatureP reserve_sig;
/**
* History of the reserve, set in the callback.
*/
struct TALER_EXCHANGEDB_ReserveHistory *rh;
/**
* Global fees applying to the request.
*/
const struct TEH_GlobalFee *gf;
/**
* Current reserve balance.
*/
struct TALER_Amount balance;
};
/**
* Send reserve history to client.
*
* @param connection connection to the client
* @param rhc reserve history to return
* @return MHD result code
*/
static MHD_RESULT
reply_reserve_history_success (struct MHD_Connection *connection,
const struct ReserveHistoryContext *rhc)
{
const struct TALER_EXCHANGEDB_ReserveHistory *rh = rhc->rh;
json_t *json_history;
json_history = TEH_RESPONSE_compile_reserve_history (rh);
if (NULL == json_history)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_JSON_ALLOCATION_FAILURE,
NULL);
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
TALER_JSON_pack_amount ("balance",
&rhc->balance),
GNUNET_JSON_pack_array_steal ("history",
json_history));
}
/**
* Function implementing /reserves/$RID/history transaction. Given the public
* key of a reserve, return the associated transaction history. Runs the
* transaction logic; 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 a `struct ReserveHistoryContext *`
* @param connection MHD request which triggered the transaction
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!); unused
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
reserve_history_transaction (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct ReserveHistoryContext *rsc = cls;
enum GNUNET_DB_QueryStatus qs;
if (! TALER_amount_is_zero (&rsc->gf->fees.history))
{
bool balance_ok = false;
bool idempotent = true;
qs = TEH_plugin->insert_history_request (TEH_plugin->cls,
rsc->reserve_pub,
&rsc->reserve_sig,
rsc->timestamp,
&rsc->gf->fees.history,
&balance_ok,
&idempotent);
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,
"get_reserve_history");
}
if (qs <= 0)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
if (! balance_ok)
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_CONFLICT,
TALER_EC_EXCHANGE_GET_RESERVE_HISTORY_ERROR_INSUFFICIENT_BALANCE,
NULL);
}
if (idempotent)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Idempotent /reserves/history request observed. Is caching working?\n");
}
}
qs = TEH_plugin->get_reserve_history (TEH_plugin->cls,
rsc->reserve_pub,
&rsc->balance,
&rsc->rh);
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,
"get_reserve_history");
}
return qs;
}
MHD_RESULT
TEH_handler_reserves_history (struct TEH_RequestContext *rc,
const struct TALER_ReservePublicKeyP *reserve_pub,
const json_t *root)
{
struct ReserveHistoryContext rsc;
MHD_RESULT mhd_ret;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_timestamp ("request_timestamp",
&rsc.timestamp),
GNUNET_JSON_spec_fixed_auto ("reserve_sig",
&rsc.reserve_sig),
GNUNET_JSON_spec_end ()
};
struct GNUNET_TIME_Timestamp now;
rsc.reserve_pub = reserve_pub;
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
if (GNUNET_SYSERR == res)
{
GNUNET_break (0);
return MHD_NO; /* hard failure */
}
if (GNUNET_NO == res)
{
GNUNET_break_op (0);
return MHD_YES; /* failure */
}
}
now = GNUNET_TIME_timestamp_get ();
if (! GNUNET_TIME_absolute_approx_eq (now.abs_time,
rsc.timestamp.abs_time,
TIMESTAMP_TOLERANCE))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_GENERIC_CLOCK_SKEW,
NULL);
}
{
struct TEH_KeyStateHandle *keys;
keys = TEH_keys_get_state ();
if (NULL == keys)
{
GNUNET_break (0);
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING,
NULL);
}
rsc.gf = TEH_keys_global_fee_by_time (keys,
rsc.timestamp);
}
if (NULL == rsc.gf)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_GENERIC_BAD_CONFIGURATION,
NULL);
}
if (GNUNET_OK !=
TALER_wallet_reserve_history_verify (rsc.timestamp,
&rsc.gf->fees.history,
reserve_pub,
&rsc.reserve_sig))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_EXCHANGE_RESERVES_HISTORY_BAD_SIGNATURE,
NULL);
}
rsc.rh = NULL;
if (GNUNET_OK !=
TEH_DB_run_transaction (rc->connection,
"get reserve history",
TEH_MT_REQUEST_OTHER,
&mhd_ret,
&reserve_history_transaction,
&rsc))
{
return mhd_ret;
}
if (NULL == rsc.rh)
{
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_EXCHANGE_RESERVES_STATUS_UNKNOWN,
NULL);
}
mhd_ret = reply_reserve_history_success (rc->connection,
&rsc);
TEH_plugin->free_reserve_history (TEH_plugin->cls,
rsc.rh);
return mhd_ret;
}
/* end of taler-exchange-httpd_reserves_history.c */