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/*
This file is part of TALER
(C) 2014-2017 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_tip-authorize.c
* @brief implement API for authorizing tips to be paid to visitors
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_parsing.h"
#include "taler-merchant-httpd_exchanges.h"
#include "taler-merchant-httpd_responses.h"
#include "taler-merchant-httpd_tip-authorize.h"
/**
* Information we keep for individual calls
* to requests that parse JSON, but keep no other state.
*/
struct TMH_JsonParseContext
{
/**
* This field MUST be first.
* FIXME: Explain why!
*/
struct TM_HandlerContext hc;
/**
* Placeholder for #TMH_PARSE_post_json() to keep its internal state.
*/
void *json_parse_context;
};
/**
* Custom cleanup routine for a `struct TMH_JsonParseContext`.
*
* @param hc the `struct TMH_JsonParseContext` to clean up.
*/
static void
json_parse_cleanup (struct TM_HandlerContext *hc)
{
struct TMH_JsonParseContext *jpc = (struct TMH_JsonParseContext *) hc;
TMH_PARSE_post_cleanup_callback (jpc->json_parse_context);
GNUNET_free (jpc);
}
/**
* Handle a "/tip-authorize" request.
*
* @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_tip_authorize (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
struct MerchantInstance *mi;
int res;
struct TALER_Amount amount;
const char *instance;
const char *justification;
const char *pickup_url;
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount ("amount", &amount),
GNUNET_JSON_spec_string ("instance", &instance),
GNUNET_JSON_spec_string ("justification", &justification),
GNUNET_JSON_spec_string ("pickup_url", &pickup_url),
GNUNET_JSON_spec_end()
};
json_t *root;
struct GNUNET_TIME_Absolute expiration;
struct GNUNET_HashCode tip_id;
struct TMH_JsonParseContext *ctx;
enum TALER_ErrorCode ec;
if (NULL == *connection_cls)
{
ctx = GNUNET_new (struct TMH_JsonParseContext);
ctx->hc.cc = &json_parse_cleanup;
*connection_cls = ctx;
}
else
{
ctx = *connection_cls;
}
res = TMH_PARSE_post_json (connection,
&ctx->json_parse_context,
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;
res = TMH_PARSE_json_data (connection,
root,
spec);
if (GNUNET_YES != res)
{
GNUNET_break_op (0);
json_decref (root);
return (GNUNET_NO == res) ? MHD_YES : MHD_NO;
}
mi = TMH_lookup_instance (instance);
if (NULL == mi)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Instance `%s' not configured\n",
instance);
json_decref (root);
return TMH_RESPONSE_reply_not_found (connection,
TALER_EC_TIP_AUTHORIZE_INSTANCE_UNKNOWN,
"unknown instance");
}
if (NULL == mi->tip_exchange)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Instance `%s' not configured for tipping\n",
instance);
json_decref (root);
return TMH_RESPONSE_reply_not_found (connection,
TALER_EC_TIP_AUTHORIZE_INSTANCE_DOES_NOT_TIP,
"exchange for tipping not configured for the instance");
}
ec = db->authorize_tip (db->cls,
justification,
&amount,
&mi->tip_reserve,
mi->tip_exchange,
&expiration,
&tip_id);
if (TALER_EC_NONE != ec)
{
unsigned int rc;
switch (ec)
{
case TALER_EC_TIP_AUTHORIZE_INSUFFICIENT_FUNDS:
rc = MHD_HTTP_PRECONDITION_FAILED;
break;
case TALER_EC_TIP_AUTHORIZE_RESERVE_EXPIRED:
rc = MHD_HTTP_PRECONDITION_FAILED;
break;
case TALER_EC_TIP_AUTHORIZE_RESERVE_UNKNOWN:
rc = MHD_HTTP_NOT_FOUND;
break;
case TALER_EC_TIP_AUTHORIZE_RESERVE_NOT_ENABLED:
rc = MHD_HTTP_NOT_FOUND;
break;
default:
rc = MHD_HTTP_INTERNAL_SERVER_ERROR;
break;
}
json_decref (root);
return TMH_RESPONSE_reply_rc (connection,
rc,
ec,
"Database error approving tip");
}
if (0)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Insufficient funds to authorize tip over `%s' at instance `%s'\n",
TALER_amount2s (&amount),
instance);
json_decref (root);
return TMH_RESPONSE_reply_rc (connection,
MHD_HTTP_PRECONDITION_FAILED,
TALER_EC_TIP_AUTHORIZE_INSUFFICIENT_FUNDS,
"Insufficient funds for tip");
}
json_t *tip_token = json_pack ("{s:o, s:o, s:o, s:s, s:s}",
"tip_id", GNUNET_JSON_from_data_auto (&tip_id),
"expiration", GNUNET_JSON_from_time_abs (expiration),
"amount", TALER_JSON_from_amount (&amount),
"exchange_url", mi->tip_exchange,
"pickup_url", pickup_url);
json_t *next_url = json_object_get (root, "next_url");
if (json_is_string (next_url))
json_object_set (tip_token, "next_url", next_url);
char *tip_token_str = json_dumps (tip_token, JSON_ENSURE_ASCII | JSON_COMPACT);
json_decref (tip_token);
json_decref (root);
int ret = TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:s, s:s}",
"tip_id", GNUNET_JSON_from_data_auto (&tip_id),
"expiration", GNUNET_JSON_from_time_abs (expiration),
"exchange_url", mi->tip_exchange,
"tip_token", tip_token_str);
GNUNET_free (tip_token_str);
return ret;
}
/* end of taler-merchant-httpd_tip-authorize.c */
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