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/*
This file is part of TALER
(C) 2014-2020 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 backend/taler-merchant-httpd_private-post-reserves-ID-authorize-tip.c
* @brief implement API for authorizing tips to be paid to visitors
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_util.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_private-post-reserves-ID-authorize-tip.h"
/**
* Handle a "tip-authorize" request.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] hc context with further information about the request
* @param reserve_pub reserve to use, or NULL for "any"
* @return MHD result code
*/
static MHD_RESULT
authorize_tip (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc,
const struct TALER_ReservePublicKeyP *reserve_pub)
{
enum TALER_ErrorCode ec;
struct GNUNET_TIME_Absolute expiration;
struct GNUNET_HashCode tip_id;
const char *justification;
const char *next_url;
struct TALER_Amount amount;
{
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount ("amount", &amount),
GNUNET_JSON_spec_string ("justification", &justification),
GNUNET_JSON_spec_string ("next_url", &next_url),
GNUNET_JSON_spec_end ()
};
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
hc->request_body,
spec);
if (GNUNET_YES != res)
{
GNUNET_break_op (0);
return (GNUNET_NO == res)
? MHD_YES
: MHD_NO;
}
}
TMH_db->preflight (TMH_db->cls);
ec = TMH_db->authorize_tip (TMH_db->cls,
hc->instance->settings.id,
reserve_pub,
&amount,
justification,
next_url,
&tip_id,
&expiration);
/* handle errors */
if (TALER_EC_NONE != ec)
{
unsigned int rc;
const char *msg;
switch (ec)
{
case TALER_EC_TIP_AUTHORIZE_INSUFFICIENT_FUNDS:
rc = MHD_HTTP_PRECONDITION_FAILED;
msg = "Failed to approve tip: merchant has insufficient tipping funds";
break;
case TALER_EC_TIP_AUTHORIZE_RESERVE_EXPIRED:
msg = "Failed to approve tip: merchant's tipping reserve expired";
rc = MHD_HTTP_GONE;
break;
case TALER_EC_TIP_AUTHORIZE_RESERVE_UNKNOWN:
msg = "Failed to approve tip: merchant's tipping reserve does not exist";
rc = MHD_HTTP_SERVICE_UNAVAILABLE;
break;
case TALER_EC_TIP_AUTHORIZE_DB_RESERVE_NOT_FOUND:
msg = "Failed to approve tip: merchant's tipping reserve does not exist";
rc = MHD_HTTP_NOT_FOUND;
break;
default:
rc = MHD_HTTP_INTERNAL_SERVER_ERROR;
msg = "Failed to approve tip: internal server error";
break;
}
return TALER_MHD_reply_with_error (connection,
rc,
ec,
msg);
}
/* generate success response */
{
char *taler_tip_uri;
const char *host;
const char *forwarded_host;
const char *uri_path;
struct GNUNET_CRYPTO_HashAsciiEncoded hash_enc;
MHD_RESULT res;
host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"Host");
forwarded_host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Host");
uri_path = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Prefix");
if (NULL != forwarded_host)
host = forwarded_host;
if (NULL == host)
{
/* Should never happen, at last the host header should be defined */
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
"unable to identify backend host");
}
GNUNET_CRYPTO_hash_to_enc (&tip_id,
&hash_enc);
GNUNET_assert (0 < GNUNET_asprintf (&taler_tip_uri,
"taler://tip/%s/%s%sinstances/%s/%s",
host,
(NULL == uri_path) ? "" : uri_path,
(NULL == uri_path) ? "" : "/",
hc->instance->settings.id,
hash_enc.encoding));
GNUNET_TIME_round_abs (&expiration);
res = TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s, s:s, s:o}",
"tip_id",
hash_enc.encoding,
"tip_redirect_url",
taler_tip_uri,
"tip_expiration",
GNUNET_JSON_from_time_abs (expiration));
GNUNET_free (taler_tip_uri);
return res;
}
}
/**
* Handle a "/reserves/$ID/tip-authorize" request.
*
* @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_private_post_reserves_ID_authorize_tip (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
struct TALER_ReservePublicKeyP reserve_pub;
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (hc->infix,
strlen (hc->infix),
&reserve_pub,
sizeof (reserve_pub)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_RESERVES_INVALID_RESERVE_PUB,
"reserve public key malformed");
}
return authorize_tip (rh,
connection,
hc,
&reserve_pub);
}
/**
* Handle a POST "/tips" request.
* Here the client does not specify the reserve public key, so we
* are free to pick "any" available reserve.
*
* @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_private_post_tips (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
return authorize_tip (rh,
connection,
hc,
NULL);
}
/* end of taler-merchant-httpd_private-post-reserves-ID-authorize-tip.c */
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