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/*
This file is part of TALER
Copyright (C) 2022 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 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, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_reserves_get_attest.c
* @brief Handle GET /reserves/$RESERVE_PUB/attest requests
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler_kyclogic_lib.h"
#include "taler_mhd_lib.h"
#include "taler_json_lib.h"
#include "taler_dbevents.h"
#include "taler-exchange-httpd_keys.h"
#include "taler-exchange-httpd_reserves_get_attest.h"
#include "taler-exchange-httpd_responses.h"
/**
* Closure for #reserve_attest_transaction.
*/
struct ReserveAttestContext
{
/**
* Public key of the reserve the inquiry is about.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* Hash of the payto URI of this reserve.
*/
struct TALER_PaytoHashP h_payto;
/**
* Available attributes.
*/
json_t *attributes;
/**
* Set to true if we did not find the reserve.
*/
bool not_found;
};
/**
* Function called with information about all applicable
* legitimization processes for the given user.
*
* @param cls our `struct ReserveAttestContext *`
* @param h_payto account for which the attribute data is stored
* @param provider_section provider that must be checked
* @param collection_time when was the data collected
* @param expiration_time when does the data expire
* @param enc_attributes_size number of bytes in @a enc_attributes
* @param enc_attributes encrypted attribute data
*/
static void
kyc_process_cb (void *cls,
const struct TALER_PaytoHashP *h_payto,
const char *provider_section,
struct GNUNET_TIME_Timestamp collection_time,
struct GNUNET_TIME_Timestamp expiration_time,
size_t enc_attributes_size,
const void *enc_attributes)
{
struct ReserveAttestContext *rsc = cls;
json_t *attrs;
json_t *val;
const char *name;
if (GNUNET_TIME_absolute_is_past (expiration_time.abs_time))
return;
attrs = TALER_CRYPTO_kyc_attributes_decrypt (&TEH_attribute_key,
enc_attributes,
enc_attributes_size);
json_object_foreach (attrs, name, val)
{
bool duplicate = false;
size_t idx;
json_t *str;
json_array_foreach (rsc->attributes, idx, str)
{
if (0 == strcmp (json_string_value (str),
name))
{
duplicate = true;
break;
}
}
if (duplicate)
continue;
GNUNET_assert (0 ==
json_array_append (rsc->attributes,
json_string (name)));
}
}
/**
* Function implementing GET /reserves/$RID/attest transaction.
* Execute a /reserves/ get attest. Given the public key of a reserve,
* return the associated transaction attest. Runs the
* transaction logic; IF it returns a non-error code, the transaction
* logic MUST NOT queue a MHD response. IF it returns an hard error,
* the transaction logic MUST queue a MHD response and set @a mhd_ret.
* IF it returns the soft error code, the function MAY be called again
* to retry and MUST not queue a MHD response.
*
* @param cls a `struct ReserveAttestContext *`
* @param connection MHD request which triggered the transaction
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
reserve_attest_transaction (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct ReserveAttestContext *rsc = cls;
enum GNUNET_DB_QueryStatus qs;
rsc->attributes = json_array ();
GNUNET_assert (NULL != rsc->attributes);
qs = TEH_plugin->select_kyc_attributes (TEH_plugin->cls,
&rsc->h_payto,
&kyc_process_cb,
rsc);
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
GNUNET_break (0);
*mhd_ret
= TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_FETCH_FAILED,
"iterate_kyc_reference");
return qs;
case GNUNET_DB_STATUS_SOFT_ERROR:
GNUNET_break (0);
return qs;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
rsc->not_found = true;
return qs;
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
rsc->not_found = false;
break;
}
return qs;
}
MHD_RESULT
TEH_handler_reserves_get_attest (struct TEH_RequestContext *rc,
const char *const args[1])
{
struct ReserveAttestContext rsc = {
.attributes = NULL
};
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[0],
strlen (args[0]),
&rsc.reserve_pub,
sizeof (rsc.reserve_pub)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_RESERVE_PUB_MALFORMED,
args[0]);
}
{
char *payto_uri;
payto_uri = TALER_reserve_make_payto (TEH_base_url,
&rsc.reserve_pub);
TALER_payto_hash (payto_uri,
&rsc.h_payto);
GNUNET_free (payto_uri);
}
{
MHD_RESULT mhd_ret;
if (GNUNET_OK !=
TEH_DB_run_transaction (rc->connection,
"get-attestable",
TEH_MT_REQUEST_OTHER,
&mhd_ret,
&reserve_attest_transaction,
&rsc))
{
json_decref (rsc.attributes);
rsc.attributes = NULL;
return mhd_ret;
}
}
/* generate proper response */
if (rsc.not_found)
{
json_decref (rsc.attributes);
rsc.attributes = NULL;
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_EXCHANGE_GENERIC_RESERVE_UNKNOWN,
args[0]);
}
return TALER_MHD_REPLY_JSON_PACK (
rc->connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_array_steal ("details",
rsc.attributes));
}
/* end of taler-exchange-httpd_reserves_get_attest.c */
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