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/*
This file is part of TALER
(C) 2014 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 merchant/backend/taler-merchant-httpd.c
* @brief HTTP serving layer mainly intended to communicate with the frontend
* @author Marcello Stanisci
*/
#include "platform.h"
#include <microhttpd.h>
#include <jansson.h>
#include <gnunet/gnunet_util_lib.h>
#include <curl/curl.h>
#include <taler/taler_signatures.h>
#include <taler/taler_amount_lib.h>
#include <taler/taler_json_lib.h>
#include <taler/taler_mint_service.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_parsing.h"
#include "taler-merchant-httpd_responses.h"
#include "taler_merchantdb_lib.h"
#include "taler-merchant-httpd.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 this contract and the hashed stringification
* of this contract to the final bundle sent 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 *trusted_mints;
json_t *j_auditors;
json_t *auditor;
json_t *mint;
json_t *j_wire;
const struct TALER_MINT_Keys *keys;
int res;
int cnt;
struct GNUNET_HashCode h_wire;
struct GNUNET_CRYPTO_EddsaPublicKey pubkey;
struct TALER_ContractPS contract;
char *contract_str;
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;
/* Generate preferred mint(s) array. */
trusted_mints = json_array ();
for (cnt = 0; cnt < nmints; cnt++)
{
if (! mints[cnt]->pending)
{
keys = TALER_MINT_get_keys (mints[cnt]->conn);
mint = json_pack ("{s:s, s:o}",
"url", mints[cnt]->hostname,
"master_pub",
TALER_json_from_data
(&keys->master_pub.eddsa_pub,
sizeof (keys->master_pub.eddsa_pub)));
json_array_append_new (trusted_mints, mint);
}
}
j_auditors = json_array ();
for (cnt = 0; cnt < nauditors; cnt++)
{
auditor = json_pack ("{s:s}",
"name", auditors[cnt].name);
json_array_append_new (j_auditors, auditor);
}
/**
* Return badly if no mints are trusted (or no call to /keys has still
* returned the expected data). WARNING: it
* may be possible that a mint trusted by the wallet is good, but
* still pending; that case must be handled with some "polling-style"
* routine, simply ignored, or ended with an invitation to the wallet
* to just retry later
*/
if (!json_array_size (trusted_mints))
return MHD_NO;
/**
* Hard error, no action can be taken by a wallet
*/
if (!json_array_size (j_auditors))
return MHD_NO;
json_object_set_new (root, "mints", trusted_mints);
json_object_set_new (root, "auditors", j_auditors);
if (NULL == (j_wire = MERCHANT_get_wire_json (wire,
salt)))
return MHD_NO;
/* hash wire objcet */
if (GNUNET_SYSERR ==
TALER_hash_json (j_wire, &h_wire))
return MHD_NO;
json_object_set_new (root,
"H_wire",
TALER_json_from_data (&h_wire, sizeof (h_wire)));
GNUNET_CRYPTO_eddsa_key_get_public (privkey, &pubkey);
json_object_set_new (root,
"merchant_pub",
TALER_json_from_data (&pubkey, sizeof (pubkey)));
/* Sign */
contract_str = json_dumps (root, JSON_COMPACT | JSON_SORT_KEYS);
GNUNET_CRYPTO_hash (contract_str, strlen (contract_str), &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);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:o}",
"contract", root,
"sig", TALER_json_from_data
(&contract_sig, sizeof (contract_sig)),
"H_contract", TALER_json_from_data
(&contract.h_contract,
sizeof (contract.h_contract)));
}
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