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/*
This file is part of TALER
Copyright (C) 2017--2022 Taler Systems SA
TALER is free software; you can redistribute it and/or
modify it under the terms of the GNU 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 bank-lib/bank_api_debit.c
* @brief Implementation of the /history/outgoing
* requests of the bank's HTTP API.
* @author Christian Grothoff
* @author Marcello Stanisci
*/
#include "platform.h"
#include "bank_api_common.h"
#include <microhttpd.h> /* just for HTTP status codes */
#include "taler_signatures.h"
/**
* How much longer than the application-specified timeout
* do we wait (giving the server a chance to respond)?
*/
#define GRACE_PERIOD_MS 1000
/**
* @brief A /history/outgoing Handle
*/
struct TALER_BANK_DebitHistoryHandle
{
/**
* The url for this request.
*/
char *request_url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_BANK_DebitHistoryCallback hcb;
/**
* Closure for @a cb.
*/
void *hcb_cls;
};
/**
* Parse history given in JSON format and invoke the callback on each item.
*
* @param hh handle to the account history request
* @param history JSON array with the history
* @return #GNUNET_OK if history was valid and @a rhistory and @a balance
* were set,
* #GNUNET_SYSERR if there was a protocol violation in @a history
*/
static enum GNUNET_GenericReturnValue
parse_account_history (struct TALER_BANK_DebitHistoryHandle *hh,
const json_t *history)
{
struct TALER_BANK_DebitHistoryResponse dhr = {
.http_status = MHD_HTTP_OK,
.ec = TALER_EC_NONE,
.response = history
};
json_t *history_array;
if (NULL == (history_array = json_object_get (history,
"outgoing_transactions")))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (! json_is_array (history_array))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
{
size_t len = json_array_size (history_array);
struct TALER_BANK_DebitDetails dd[GNUNET_NZL (len)];
GNUNET_break_op (0 != len);
for (unsigned int i = 0; i<len; i++)
{
struct TALER_BANK_DebitDetails *td = &dd[i];
struct GNUNET_JSON_Specification hist_spec[] = {
TALER_JSON_spec_amount_any ("amount",
&td->amount),
GNUNET_JSON_spec_timestamp ("date",
&td->execution_date),
GNUNET_JSON_spec_uint64 ("row_id",
&td->serial_id),
GNUNET_JSON_spec_fixed_auto ("wtid",
&td->wtid),
GNUNET_JSON_spec_string ("credit_account",
&td->credit_account_uri),
GNUNET_JSON_spec_string ("debit_account",
&td->debit_account_uri),
GNUNET_JSON_spec_string ("exchange_base_url",
&td->exchange_base_url),
GNUNET_JSON_spec_end ()
};
json_t *transaction = json_array_get (history_array,
i);
if (GNUNET_OK !=
GNUNET_JSON_parse (transaction,
hist_spec,
NULL,
NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
dhr.details.success.details_length = len;
dhr.details.success.details = dd;
hh->hcb (hh->hcb_cls,
&dhr);
}
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /history/outgoing request.
*
* @param cls the `struct TALER_BANK_DebitHistoryHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_debit_history_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_BANK_DebitHistoryHandle *hh = cls;
struct TALER_BANK_DebitHistoryResponse dhr = {
.http_status = MHD_HTTP_OK,
.response = response
};
hh->job = NULL;
switch (response_code)
{
case 0:
dhr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
if (GNUNET_OK !=
parse_account_history (hh,
dhr.response))
{
GNUNET_break_op (0);
dhr.http_status = 0;
dhr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
TALER_BANK_debit_history_cancel (hh);
return;
case MHD_HTTP_NO_CONTENT:
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the bank is buggy
(or API version conflict); just pass JSON reply to the application */
GNUNET_break_op (0);
dhr.ec = TALER_JSON_get_error_code (dhr.response);
break;
case MHD_HTTP_UNAUTHORIZED:
/* Nothing really to verify, bank says the HTTP Authentication
failed. May happen if HTTP authentication is used and the
user supplied a wrong username/password combination. */
dhr.ec = TALER_JSON_get_error_code (dhr.response);
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify: the bank is either unaware
of the endpoint (not a bank), or of the account.
We should pass the JSON (?) reply to the application */
dhr.ec = TALER_JSON_get_error_code (dhr.response);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
dhr.ec = TALER_JSON_get_error_code (dhr.response);
break;
default:
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
dhr.ec = TALER_JSON_get_error_code (dhr.response);
break;
}
hh->hcb (hh->hcb_cls,
&dhr);
TALER_BANK_debit_history_cancel (hh);
}
struct TALER_BANK_DebitHistoryHandle *
TALER_BANK_debit_history (struct GNUNET_CURL_Context *ctx,
const struct TALER_BANK_AuthenticationData *auth,
uint64_t start_row,
int64_t num_results,
struct GNUNET_TIME_Relative timeout,
TALER_BANK_DebitHistoryCallback hres_cb,
void *hres_cb_cls)
{
char url[128];
struct TALER_BANK_DebitHistoryHandle *hh;
CURL *eh;
unsigned long long tms;
if (0 == num_results)
{
GNUNET_break (0);
return NULL;
}
tms = (unsigned long long) (timeout.rel_value_us
/ GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us);
if ( ( (UINT64_MAX == start_row) &&
(0 > num_results) ) ||
( (0 == start_row) &&
(0 < num_results) ) )
{
if ( (0 < num_results) &&
(! GNUNET_TIME_relative_is_zero (timeout)) )
GNUNET_snprintf (url,
sizeof (url),
"history/outgoing?delta=%lld&long_poll_ms=%llu",
(long long) num_results,
tms);
else
GNUNET_snprintf (url,
sizeof (url),
"history/outgoing?delta=%lld",
(long long) num_results);
}
else
{
if ( (0 < num_results) &&
(! GNUNET_TIME_relative_is_zero (timeout)) )
GNUNET_snprintf (url,
sizeof (url),
"history/outgoing?delta=%lld&start=%llu&long_poll_ms=%llu",
(long long) num_results,
(unsigned long long) start_row,
tms);
else
GNUNET_snprintf (url,
sizeof (url),
"history/outgoing?delta=%lld&start=%llu",
(long long) num_results,
(unsigned long long) start_row);
}
hh = GNUNET_new (struct TALER_BANK_DebitHistoryHandle);
hh->hcb = hres_cb;
hh->hcb_cls = hres_cb_cls;
hh->request_url = TALER_url_join (auth->wire_gateway_url,
url,
NULL);
if (NULL == hh->request_url)
{
GNUNET_free (hh);
GNUNET_break (0);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Requesting debit history at `%s'\n",
hh->request_url);
eh = curl_easy_init ();
if ( (NULL == eh) ||
(GNUNET_OK !=
TALER_BANK_setup_auth_ (eh,
auth)) ||
(CURLE_OK !=
curl_easy_setopt (eh,
CURLOPT_URL,
hh->request_url)) )
{
GNUNET_break (0);
TALER_BANK_debit_history_cancel (hh);
if (NULL != eh)
curl_easy_cleanup (eh);
return NULL;
}
if (0 != tms)
{
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_TIMEOUT_MS,
(long) tms + GRACE_PERIOD_MS));
}
hh->job = GNUNET_CURL_job_add2 (ctx,
eh,
NULL,
&handle_debit_history_finished,
hh);
return hh;
}
void
TALER_BANK_debit_history_cancel (struct TALER_BANK_DebitHistoryHandle *hh)
{
if (NULL != hh->job)
{
GNUNET_CURL_job_cancel (hh->job);
hh->job = NULL;
}
GNUNET_free (hh->request_url);
GNUNET_free (hh);
}
/* end of bank_api_debit.c */
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