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/*
This file is part of TALER
(C) 2014, 2015, 2016, 2018, 2020 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 taler-merchant-httpd_post-orders-ID-claim.c
* @brief headers for POST /orders/$ID/claim handler
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_signatures.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd_post-orders-ID-claim.h"
/**
* How often do we retry the database transaction?
*/
#define MAX_RETRIES 3
/**
* Run transaction to claim @a order_id for @a nonce.
*
* @param instance_id instance to claim order at
* @param order_id order to claim
* @param nonce nonce to use for the claim
* @param claim_token the token that should be used to verify the claim
* @param[out] contract_terms set to the resulting contract terms
* (for any non-negative result;
* @return transaction status code
* #GNUNET_DB_STATUS_SUCCESS_NO_RESULTS if the order was claimed by a different
* nonce (@a contract_terms set to non-NULL)
* OR if the order is is unknown (@a contract_terms is NULL)
* #GNUNET_DB_STATUS_SUCCESS_ONE_RESULT if the order was successfully claimed
*/
static enum GNUNET_DB_QueryStatus
claim_order (const char *instance_id,
const char *order_id,
const char *nonce,
const struct TALER_ClaimTokenP *claim_token,
json_t **contract_terms)
{
struct TALER_ClaimTokenP order_ct;
enum GNUNET_DB_QueryStatus qs;
if (GNUNET_OK !=
TMH_db->start (TMH_db->cls,
"claim order"))
{
GNUNET_break (0);
return GNUNET_DB_STATUS_HARD_ERROR;
}
{
uint64_t order_serial;
qs = TMH_db->lookup_contract_terms (TMH_db->cls,
instance_id,
order_id,
contract_terms,
&order_serial);
}
if (0 > qs)
{
TMH_db->rollback (TMH_db->cls);
return qs;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
struct GNUNET_HashCode unused;
/* see if we have this order in our table of unclaimed orders */
qs = TMH_db->lookup_order (TMH_db->cls,
instance_id,
order_id,
&order_ct,
&unused,
contract_terms);
if (0 >= qs)
{
TMH_db->rollback (TMH_db->cls);
return qs;
}
GNUNET_assert (NULL != contract_terms);
GNUNET_assert (0 ==
json_object_set_new (*contract_terms,
"nonce",
json_string (nonce)));
if (0 != GNUNET_memcmp (&order_ct,
claim_token))
{
TMH_db->rollback (TMH_db->cls);
json_decref (*contract_terms);
*contract_terms = NULL;
return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
}
qs = TMH_db->insert_contract_terms (TMH_db->cls,
instance_id,
order_id,
*contract_terms);
if (0 > qs)
{
TMH_db->rollback (TMH_db->cls);
json_decref (*contract_terms);
*contract_terms = NULL;
return qs;
}
qs = TMH_db->commit (TMH_db->cls);
if (0 > qs)
return qs;
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}
else
{
const char *stored_nonce;
TMH_db->rollback (TMH_db->cls);
GNUNET_assert (NULL != *contract_terms);
stored_nonce
= json_string_value (json_object_get (*contract_terms,
"nonce"));
if (NULL == stored_nonce)
{
/* this should not be possible: contract_terms should always
have a nonce! */
GNUNET_break (0);
return GNUNET_DB_STATUS_HARD_ERROR;
}
if (0 != strcmp (stored_nonce,
nonce))
{
return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
}
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}
}
/**
* Manage a POST /orders/$ID/claim request. Allows the client to
* claim the order (unless already claims) and creates the respective
* contract. Returns the contract terms.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] hc context with further information about the request
* @return MHD result code
*/
MHD_RESULT
TMH_post_orders_ID_claim (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
const char *order_id = hc->infix;
const char *nonce;
enum GNUNET_DB_QueryStatus qs;
json_t *contract_terms;
struct TALER_ClaimTokenP claim_token;
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("nonce",
&nonce),
GNUNET_JSON_spec_end ()
};
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
hc->request_body,
spec);
if (GNUNET_OK != res)
return (GNUNET_NO == res)
? MHD_YES
: MHD_NO;
}
if (NULL != json_object_get (hc->request_body,
"token"))
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("token",
&claim_token),
GNUNET_JSON_spec_end ()
};
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
hc->request_body,
spec);
if (GNUNET_OK != res)
return (GNUNET_NO == res)
? MHD_YES
: MHD_NO;
}
else
{
memset (&claim_token,
0,
sizeof (claim_token));
}
contract_terms = NULL;
for (unsigned int i = 0; i<MAX_RETRIES; i++)
{
TMH_db->preflight (TMH_db->cls);
qs = claim_order (hc->instance->settings.id,
order_id,
nonce,
&claim_token,
&contract_terms);
if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
break;
}
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_ORDERS_CLAIM_HARD_DB_ERROR,
NULL);
case GNUNET_DB_STATUS_SOFT_ERROR:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_ORDERS_CLAIM_SOFT_DB_ERROR,
NULL);
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
if (NULL == contract_terms)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_ORDERS_CLAIM_NOT_FOUND,
order_id);
/* already claimed! */
json_decref (contract_terms);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_CONFLICT,
TALER_EC_ORDERS_ALREADY_CLAIMED,
order_id);
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
GNUNET_assert (NULL != contract_terms);
break; /* Good! return signature (below) */
}
/* create proposal signature */
{
struct GNUNET_CRYPTO_EddsaSignature merchant_sig;
struct TALER_ProposalDataPS pdps = {
.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_CONTRACT),
.purpose.size = htonl (sizeof (pdps))
};
if (GNUNET_OK !=
TALER_JSON_contract_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,
NULL);
}
GNUNET_CRYPTO_eddsa_sign (&hc->instance->merchant_priv.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_post-orders-ID-claim.c */
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