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/*
This file is part of TALER
(C) 2014, 2015, 2016, 2018 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 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,
see <http://www.gnu.org/licenses/>
*/
/**
* @file backend/taler-merchant-httpd_proposal.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/taler_json_lib.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_auditors.h"
#include "taler-merchant-httpd_exchanges.h"
/**
* How often do we retry the simple INSERT database transaction?
*/
#define MAX_RETRIES 3
/**
* Manage a GET /proposal request. Query the db and returns the
* proposal's data related to the transaction id given as the URL's
* parameter.
*
* Binds the proposal to a nonce.
*
* @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
* @param mi merchant backend instance, never NULL
* @return MHD result code
*/
MHD_RESULT
MH_handler_proposal_lookup (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size,
struct MerchantInstance *mi)
{
const char *order_id;
const char *nonce;
enum GNUNET_DB_QueryStatus qs;
json_t *contract_terms;
struct GNUNET_CRYPTO_EddsaSignature merchant_sig;
const char *stored_nonce;
order_id = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"order_id");
if (NULL == order_id)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_PARAMETER_MISSING,
"order_id");
nonce = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"nonce");
if (NULL == nonce)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_PARAMETER_MISSING,
"nonce");
db->preflight (db->cls);
qs = db->find_contract_terms (db->cls,
&contract_terms,
order_id,
&mi->pubkey);
if (0 > qs)
{
/* single, read-only SQL statements should never cause
serialization problems */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PROPOSAL_LOOKUP_DB_ERROR,
"An error occurred while retrieving proposal data from db");
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
struct GNUNET_TIME_Absolute timestamp;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_absolute_time ("timestamp", ×tamp),
GNUNET_JSON_spec_end ()
};
enum GNUNET_GenericReturnValue res;
db->preflight (db->cls);
qs = db->find_order (db->cls,
&contract_terms,
order_id,
&mi->pubkey);
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_PROPOSAL_LOOKUP_NOT_FOUND,
"unknown order id");
}
GNUNET_assert (NULL != contract_terms);
json_object_set_new (contract_terms,
"nonce",
json_string (nonce));
/* extract fields we need to sign separately */
res = TALER_MHD_parse_json_data (connection,
contract_terms,
spec);
if (GNUNET_NO == res)
{
return MHD_YES;
}
if (GNUNET_SYSERR == res)
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PROPOSAL_ORDER_PARSE_ERROR,
"Impossible to parse the order");
}
for (unsigned int i = 0; i<MAX_RETRIES; i++)
{
db->preflight (db->cls);
qs = db->insert_contract_terms (db->cls,
order_id,
&mi->pubkey,
timestamp,
contract_terms);
if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
break;
}
if (0 > qs)
{
/* Special report if retries insufficient */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PROPOSAL_STORE_DB_ERROR,
"db error: could not store this proposal's data into db");
}
// FIXME: now we can delete (merchant_pub, order_id) from the merchant_orders table
}
GNUNET_assert (NULL != contract_terms);
stored_nonce
= json_string_value (json_object_get (contract_terms,
"nonce"));
if (NULL == stored_nonce)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PROPOSAL_ORDER_PARSE_ERROR,
"existing proposal has no nonce");
}
if (0 != strcmp (stored_nonce,
nonce))
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_PROPOSAL_LOOKUP_NOT_FOUND,
"mismatched nonce");
}
/* create proposal signature */
{
struct TALER_ProposalDataPS pdps = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_CONTRACT),
.purpose.size = htonl (sizeof (pdps))
};
if (GNUNET_OK !=
TALER_JSON_hash (contract_terms,
&pdps.hash))
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_LOGIC_ERROR,
"Could not hash order");
}
GNUNET_CRYPTO_eddsa_sign (&mi->privkey.eddsa_priv,
&pdps,
&merchant_sig);
}
return TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{ s:o, s:o }",
"contract_terms",
contract_terms,
"sig",
GNUNET_JSON_from_data_auto (
&merchant_sig));
}
/* end of taler-merchant-httpd_proposal.c */
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