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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 taler-merchant-httpd_get-tips-ID.c
* @brief implementation of GET /tips/$ID
* @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_get-tips-ID.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_qr.h"
#include "taler-merchant-httpd_templating.h"
char *
TMH_make_taler_tip_uri (struct MHD_Connection *con,
const struct GNUNET_HashCode *tip_id,
const char *instance_id)
{
const char *host;
const char *forwarded_host;
const char *uri_path;
struct GNUNET_Buffer buf = { 0 };
host = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"Host");
forwarded_host = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"X-Forwarded-Host");
uri_path = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"X-Forwarded-Prefix");
if (NULL != forwarded_host)
host = forwarded_host;
if (NULL == host)
{
GNUNET_break (0);
return NULL;
}
GNUNET_assert (NULL != instance_id);
GNUNET_assert (NULL != tip_id);
GNUNET_buffer_write_str (&buf,
"taler");
if (GNUNET_NO == TALER_mhd_is_https (con))
GNUNET_buffer_write_str (&buf,
"+http");
GNUNET_buffer_write_str (&buf,
"://tip/");
GNUNET_buffer_write_str (&buf,
host);
if (NULL != uri_path)
GNUNET_buffer_write_path (&buf,
uri_path);
if (0 != strcmp ("default",
instance_id))
{
GNUNET_buffer_write_path (&buf,
"instances");
GNUNET_buffer_write_path (&buf,
instance_id);
}
/* Ensure previous part is slash-terminated */
GNUNET_buffer_write_path (&buf,
"");
GNUNET_buffer_write_data_encoded (&buf,
tip_id,
sizeof (*tip_id));
return GNUNET_buffer_reap_str (&buf);
}
char *
TMH_make_tip_status_url (struct MHD_Connection *con,
const struct GNUNET_HashCode *tip_id,
const char *instance_id)
{
const char *host;
const char *forwarded_host;
const char *uri_path;
struct GNUNET_Buffer buf = { 0 };
host = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"Host");
forwarded_host = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"X-Forwarded-Host");
uri_path = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
"X-Forwarded-Prefix");
if (NULL != forwarded_host)
host = forwarded_host;
if (NULL == host)
{
GNUNET_break (0);
return NULL;
}
GNUNET_assert (NULL != instance_id);
GNUNET_assert (NULL != tip_id);
if (GNUNET_NO == TALER_mhd_is_https (con))
GNUNET_buffer_write_str (&buf,
"http://");
else
GNUNET_buffer_write_str (&buf,
"https://");
GNUNET_buffer_write_str (&buf,
host);
if (NULL != uri_path)
GNUNET_buffer_write_path (&buf,
uri_path);
if (0 != strcmp ("default",
instance_id))
{
GNUNET_buffer_write_path (&buf,
"instances");
GNUNET_buffer_write_path (&buf,
instance_id);
}
GNUNET_buffer_write_path (&buf,
"tips/");
GNUNET_buffer_write_data_encoded (&buf,
tip_id,
sizeof (*tip_id));
return GNUNET_buffer_reap_str (&buf);
}
MHD_RESULT
TMH_get_tips_ID (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
struct GNUNET_HashCode tip_id;
enum GNUNET_DB_QueryStatus qs;
struct TALER_Amount total_authorized;
struct TALER_Amount total_picked_up;
struct GNUNET_TIME_Absolute expiration;
char *exchange_url;
struct TALER_ReservePrivateKeyP reserve_priv;
if (GNUNET_OK !=
GNUNET_CRYPTO_hash_from_string (hc->infix,
&tip_id))
{
/* tip_id has wrong encoding */
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_PARAMETER_MALFORMED,
hc->infix);
}
TMH_db->preflight (TMH_db->cls);
qs = TMH_db->lookup_tip (TMH_db->cls,
hc->instance->settings.id,
&tip_id,
&total_authorized,
&total_picked_up,
&expiration,
&exchange_url,
&reserve_priv);
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_GET_TIPS_DB_LOOKUP_ERROR,
NULL);
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Unknown tip id given: `%s'\n",
hc->infix);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_GET_TIPS_ID_UNKNOWN,
hc->infix);
}
/* Build response */
{
struct TALER_Amount remaining;
struct GNUNET_TIME_Absolute expiration_round = expiration;
MHD_RESULT ret;
GNUNET_break (0 <=
TALER_amount_subtract (&remaining,
&total_authorized,
&total_picked_up));
GNUNET_TIME_round_abs (&expiration_round);
if (TMH_MHD_test_html_desired (connection))
{
char *qr;
char *uri;
char *tip_status_url;
uri = TMH_make_taler_tip_uri (connection,
&tip_id,
hc->instance->settings.id);
tip_status_url = TMH_make_tip_status_url (connection,
&tip_id,
hc->instance->settings.id);
qr = TMH_create_qrcode (uri);
if (NULL == qr)
{
GNUNET_break (0);
GNUNET_free (uri);
ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_ALLOCATION_FAILURE,
"during QR code generation");
}
else
{
json_t *context;
context = json_pack ("{s:s, s:s, s:s}",
"remaining_tip",
TALER_amount2s (&remaining),
"taler_tip_uri",
uri,
"taler_tip_qrcode_svg",
qr);
GNUNET_assert (NULL != context);
ret = TMH_return_from_template (connection,
( (0 == remaining.value) &&
(0 == remaining.fraction) )
? MHD_HTTP_GONE
: MHD_HTTP_OK,
( (0 == remaining.value) &&
(0 == remaining.fraction) )
? "depleted_tip"
: "offer_tip",
uri,
context);
json_decref (context);
}
GNUNET_free (tip_status_url);
GNUNET_free (uri);
GNUNET_free (qr);
}
else
{
ret = TALER_MHD_reply_json_pack (connection,
( (0 == remaining.value) &&
(0 == remaining.fraction) )
? MHD_HTTP_GONE
: MHD_HTTP_OK,
"{s:s, s:o, s:o}",
"exchange_url",
exchange_url,
"tip_amount",
TALER_JSON_from_amount (&remaining),
"expiration",
GNUNET_JSON_from_time_abs (
expiration_round));
}
GNUNET_free (exchange_url);
return ret;
}
}
/* end of taler-merchant-httpd_get-tips-ID.c */
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