diff options
Diffstat (limited to 'src/exchange/taler-exchange-httpd_reserves_open.c')
| -rw-r--r-- | src/exchange/taler-exchange-httpd_reserves_open.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_reserves_open.c b/src/exchange/taler-exchange-httpd_reserves_open.c new file mode 100644 index 00000000..9ef736f9 --- /dev/null +++ b/src/exchange/taler-exchange-httpd_reserves_open.c @@ -0,0 +1,281 @@ +/* + 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 <http://www.gnu.org/licenses/> +*/ +/** + * @file taler-exchange-httpd_reserves_open.c + * @brief Handle /reserves/$RESERVE_PUB/open requests + * @author Christian Grothoff + */ +#include "platform.h" +#include <gnunet/gnunet_util_lib.h> +#include <jansson.h> +#include "taler_mhd_lib.h" +#include "taler_json_lib.h" +#include "taler_dbevents.h" +#include "taler-exchange-httpd_keys.h" +#include "taler-exchange-httpd_reserves_open.h" +#include "taler-exchange-httpd_responses.h" + + +/** + * How far do we allow a client's time to be off when + * checking the request timestamp? + */ +#define TIMESTAMP_TOLERANCE \ + GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15) + + +/** + * Closure for #reserve_open_transaction. + */ +struct ReserveOpenContext +{ + /** + * Public key of the reserve the inquiry is about. + */ + const struct TALER_ReservePublicKeyP *reserve_pub; + + /** + * Timestamp of the request. + */ + struct GNUNET_TIME_Timestamp timestamp; + + /** + * Client signature approving the request. + */ + struct TALER_ReserveSignatureP reserve_sig; + + /** + * Open of the reserve, set in the callback. + */ + struct TALER_EXCHANGEDB_ReserveOpen *rh; + + /** + * Global fees applying to the request. + */ + const struct TEH_GlobalFee *gf; + + /** + * Current reserve balance. + */ + struct TALER_Amount balance; +}; + + +/** + * Send reserve open to client. + * + * @param connection connection to the client + * @param rhc reserve open to return + * @return MHD result code + */ +static MHD_RESULT +reply_reserve_open_success (struct MHD_Connection *connection, + const struct ReserveOpenContext *rhc) +{ + const struct TALER_EXCHANGEDB_ReserveOpen *rh = rhc->rh; + + return TALER_MHD_REPLY_JSON_PACK ( + connection, + MHD_HTTP_OK, + TALER_JSON_pack_amount ("balance", + &rhc->balance)); +} + + +/** + * Function implementing /reserves/$RID/open transaction. Given the public + * key of a reserve, return the associated transaction open. 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 ReserveOpenContext *` + * @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_open_transaction (void *cls, + struct MHD_Connection *connection, + MHD_RESULT *mhd_ret) +{ + struct ReserveOpenContext *rsc = cls; + enum GNUNET_DB_QueryStatus qs; + + if (! TALER_amount_is_zero (&rsc->gf->fees.open)) + { + bool balance_ok = false; + bool idempotent = true; + + qs = TEH_plugin->insert_open_request (TEH_plugin->cls, + rsc->reserve_pub, + &rsc->reserve_sig, + rsc->timestamp, + &rsc->gf->fees.open, + &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_open"); + } + 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_WITHDRAW_OPEN_ERROR_INSUFFICIENT_FUNDS, + NULL); + } + if (idempotent) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Idempotent /reserves/open request observed. Is caching working?\n"); + } + } + qs = TEH_plugin->get_reserve_open (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_open"); + } + return qs; +} + + +MHD_RESULT +TEH_handler_reserves_open (struct TEH_RequestContext *rc, + const struct TALER_ReservePublicKeyP *reserve_pub, + const json_t *root) +{ + struct ReserveOpenContext 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_open_verify (rsc.timestamp, + &rsc.gf->fees.open, + reserve_pub, + &rsc.reserve_sig)) + { + GNUNET_break_op (0); + return TALER_MHD_reply_with_error (rc->connection, + MHD_HTTP_FORBIDDEN, + TALER_EC_EXCHANGE_RESERVES_OPEN_BAD_SIGNATURE, + NULL); + } + rsc.rh = NULL; + if (GNUNET_OK != + TEH_DB_run_transaction (rc->connection, + "reserve open", + TEH_MT_REQUEST_OTHER, + &mhd_ret, + &reserve_open_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); + } + return reply_reserve_open_success (rc->connection, + &rsc); +} + + +/* end of taler-exchange-httpd_reserves_open.c */ |