From edd31c74151d6bfe3d840bcc62b619aacf7542eb Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Wed, 20 Apr 2016 02:50:52 +0200 Subject: implementing parsing of /refund requests --- src/exchange/taler-exchange-httpd_refund.c | 146 +++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 src/exchange/taler-exchange-httpd_refund.c (limited to 'src/exchange/taler-exchange-httpd_refund.c') diff --git a/src/exchange/taler-exchange-httpd_refund.c b/src/exchange/taler-exchange-httpd_refund.c new file mode 100644 index 000000000..c5f24000d --- /dev/null +++ b/src/exchange/taler-exchange-httpd_refund.c @@ -0,0 +1,146 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015, 2016 Inria and GNUnet e.V. + + 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, If not, see +*/ +/** + * @file taler-exchange-httpd_refund.c + * @brief Handle /refund requests; parses the POST and JSON and + * verifies the coin signature before handing things off + * to the database. + * @author Florian Dold + * @author Benedikt Mueller + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include +#include +#include +#include +#include "taler_json_lib.h" +#include "taler-exchange-httpd_parsing.h" +#include "taler-exchange-httpd_refund.h" +#include "taler-exchange-httpd_responses.h" +#include "taler-exchange-httpd_keystate.h" +#include "taler-exchange-httpd_validation.h" + + +/** + * We have parsed the JSON information about the refund, do some basic + * sanity checks (especially that the signature on the coin is valid) + * and then execute the refund. Note that we need the DB to check + * the fee structure, so this is not done here. + * + * @param connection the MHD connection to handle + * @param refund information about the refund + * @return MHD result code + */ +static int +verify_and_execute_refund (struct MHD_Connection *connection, + const struct TALER_EXCHANGEDB_Refund *refund) +{ + struct TALER_RefundRequestPS dr; + + dr.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND); + dr.purpose.size = htonl (sizeof (struct TALER_RefundRequestPS)); + dr.h_contract = refund->h_contract; + dr.transaction_id = GNUNET_htonll (refund->transaction_id); + dr.rtransaction_id = GNUNET_htonll (refund->rtransaction_id); + TALER_amount_hton (&dr.refund_amount, + &refund->refund_amount); + TALER_amount_hton (&dr.refund_fee, + &refund->refund_fee); + dr.merchant = refund->merchant_pub; + dr.coin_pub = refund->coin.coin_pub; + if (GNUNET_OK != + GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_REFUND, + &dr.purpose, + &refund->merchant_sig.eddsa_sig, + &refund->merchant_pub.eddsa_pub)) + { + TALER_LOG_WARNING ("Invalid signature on /refund request\n"); + return TMH_RESPONSE_reply_signature_invalid (connection, + "merchant_sig"); + } +#if 1 + GNUNET_break (0); // FIXME: not implemented + return MHD_NO; +#else + return TMH_DB_execute_refund (connection, + refund); +#endif +} + + +/** + * Handle a "/refund" request. Parses the JSON, and, if successful, + * passes the JSON data to #parse_and_handle_refund_request() to + * further check the details of the operation specified. If + * everything checks out, this will ultimately lead to the "/refund" + * being executed, or rejected. + * + * @param rh context of the handler + * @param connection the MHD connection to handle + * @param[in,out] connection_cls the connection's closure (can be updated) + * @param upload_data upload data + * @param[in,out] upload_data_size number of bytes (left) in @a upload_data + * @return MHD result code + */ +int +TMH_REFUND_handler_refund (struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + void **connection_cls, + const char *upload_data, + size_t *upload_data_size) +{ + json_t *json; + int res; + struct TALER_EXCHANGEDB_Refund refund; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount ("refund_amount", &refund.refund_amount), + TALER_JSON_spec_amount ("refund_fee", &refund.refund_fee), + GNUNET_JSON_spec_fixed_auto ("H_contract", &refund.h_contract), + GNUNET_JSON_spec_uint64 ("transaction_id", &refund.transaction_id), + GNUNET_JSON_spec_fixed_auto ("coin_pub", &refund.coin.coin_pub), + GNUNET_JSON_spec_fixed_auto ("merchant_pub", &refund.merchant_pub), + GNUNET_JSON_spec_uint64 ("rtransaction_id", &refund.rtransaction_id), + GNUNET_JSON_spec_fixed_auto ("merchant_sig", &refund.merchant_sig), + GNUNET_JSON_spec_end () + }; + + res = TMH_PARSE_post_json (connection, + connection_cls, + upload_data, + upload_data_size, + &json); + if (GNUNET_SYSERR == res) + return MHD_NO; + if ( (GNUNET_NO == res) || (NULL == json) ) + return MHD_YES; + res = TMH_PARSE_json_data (connection, + json, + spec); + json_decref (json); + if (GNUNET_SYSERR == res) + return MHD_NO; /* hard failure */ + if (GNUNET_NO == res) + return MHD_YES; /* failure */ + res = verify_and_execute_refund (connection, + &refund); + GNUNET_JSON_parse_free (spec); + return res; +} + + +/* end of taler-exchange-httpd_refund.c */ -- cgit v1.2.3