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/*
This file is part of TALER
(C) 2014, 2015 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file backend/taler-merchant-httpd_contract.c
* @brief HTTP serving layer mainly intended to communicate with the frontend
* @author Marcello Stanisci
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_signatures.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_parsing.h"
#include "taler-merchant-httpd_auditors.h"
#include "taler-merchant-httpd_mints.h"
#include "taler-merchant-httpd_responses.h"
/**
* Manage a contract request. In practical terms, it adds the fields
* 'mints', 'merchant_pub', and 'H_wire' to the contract 'proposition'
* gotten from the frontend. Finally, it adds (outside of the
* contract) a signature of the (hashed stringification) of the
* contract (and the hashed stringification of this contract as well
* to aid diagnostics) to the final bundle, which is then send back to
* the frontend.
*
* @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
MH_handler_contract (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
json_t *root;
json_t *jcontract;
json_t *pay_url;
json_t *exec_url;
int res;
struct TALER_ContractPS contract;
struct GNUNET_CRYPTO_EddsaSignature contract_sig;
res = TMH_PARSE_post_json (connection,
connection_cls,
upload_data,
upload_data_size,
&root);
if (GNUNET_SYSERR == res)
return MHD_NO;
/* the POST's body has to be further fetched */
if ((GNUNET_NO == res) || (NULL == root))
return MHD_YES;
jcontract = json_object_get (root, "contract");
if (NULL == jcontract)
{
return TMH_RESPONSE_reply_internal_error (connection,
"contract request malformed");
}
/* add fields to the contract that the backend should provide */
json_object_set (jcontract,
"mints",
trusted_mints);
json_object_set (jcontract,
"auditors",
j_auditors);
json_object_set_new (jcontract,
"H_wire",
TALER_json_from_data (&h_wire,
sizeof (h_wire)));
json_object_set_new (jcontract,
"merchant_pub",
TALER_json_from_data (&pubkey,
sizeof (pubkey)));
/* create contract signature */
GNUNET_assert (GNUNET_OK ==
TALER_hash_json (root,
&contract.h_contract));
contract.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_CONTRACT);
contract.purpose.size = htonl (sizeof (contract));
GNUNET_CRYPTO_eddsa_sign (privkey,
&contract.purpose,
&contract_sig);
pay_url = json_object_get (root, "pay_url");
if (NULL == pay_url)
{
return TMH_RESPONSE_reply_internal_error (connection,
"pay url missing");
}
exec_url = json_object_get (root, "exec_url");
if (NULL == exec_url)
{
return TMH_RESPONSE_reply_internal_error (connection,
"exec url missing");
}
/* return final response */
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:o, s:o, s:o}",
"contract", jcontract,
"exec_url", exec_url,
"pay_url", pay_url,
"sig", TALER_json_from_data (&contract_sig,
sizeof (contract_sig)),
"H_contract", TALER_json_from_data (&contract.h_contract,
sizeof (contract.h_contract)));
}
/* end of taler-merchant-httpd_contract.c */
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