/*
This file is part of Anastasis
Copyright (C) 2020, 2021 Anastasis SARL
Anastasis 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.
Anastasis 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
Anastasis; see the file COPYING.GPL. If not, see
*/
/**
* @file restclient/anastasis_api_config.c
* @brief Implementation of the /config GET
* @author Christian Grothoff
* @author Dennis Neufeld
* @author Dominik Meister
*/
#include "platform.h"
#include
#include /* just for HTTP status codes */
#include "anastasis_service.h"
#include "anastasis_api_curl_defaults.h"
#include
#include
/**
* Which version of the Taler protocol is implemented
* by this library? Used to determine compatibility.
*/
#define ANASTASIS_PROTOCOL_CURRENT 0
/**
* How many versions are we backwards compatible with?
*/
#define ANASTASIS_PROTOCOL_AGE 0
struct ANASTASIS_ConfigOperation
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* The callback to pass the backend response to
*/
ANASTASIS_ConfigCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
};
/**
* Function called when we're done processing the
* HTTP /config request.
*
* @param cls the `struct ANASTASIS_ConfigOperation`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_config_finished (void *cls,
long response_code,
const void *response)
{
struct ANASTASIS_ConfigOperation *co = cls;
const json_t *json = response;
co->job = NULL;
switch (response_code)
{
case 0:
/* No reply received */
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Backend `%s' failed to respond to GET /config\n",
co->url);
break;
case MHD_HTTP_OK:
{
const char *name;
struct ANASTASIS_Config acfg;
json_t *methods;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("name",
&name),
GNUNET_JSON_spec_string ("business_name",
&acfg.business_name),
GNUNET_JSON_spec_string ("version",
&acfg.version),
GNUNET_JSON_spec_string ("currency",
&acfg.currency),
GNUNET_JSON_spec_json ("methods",
&methods),
GNUNET_JSON_spec_uint32 ("storage_limit_in_megabytes",
&acfg.storage_limit_in_megabytes),
TALER_JSON_spec_amount_any ("annual_fee",
&acfg.annual_fee),
TALER_JSON_spec_amount_any ("truth_upload_fee",
&acfg.truth_upload_fee),
TALER_JSON_spec_amount_any ("liability_limit",
&acfg.liability_limit),
GNUNET_JSON_spec_fixed_auto ("provider_salt",
&acfg.provider_salt),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
if (0 != strcmp (name,
"anastasis"))
{
GNUNET_JSON_parse_free (spec);
response_code = 0;
break;
}
{
unsigned int age;
unsigned int revision;
unsigned int current;
char dummy;
if (3 != sscanf (acfg.version,
"%u:%u:%u%c",
¤t,
&revision,
&age,
&dummy))
{
GNUNET_break_op (0);
response_code = 0;
GNUNET_JSON_parse_free (spec);
break;
}
if ( (ANASTASIS_PROTOCOL_CURRENT < current) &&
(ANASTASIS_PROTOCOL_CURRENT < current - age) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Provider protocol version too new\n");
response_code = 0;
GNUNET_JSON_parse_free (spec);
break;
}
if ( (ANASTASIS_PROTOCOL_CURRENT > current) &&
(ANASTASIS_PROTOCOL_CURRENT - ANASTASIS_PROTOCOL_AGE > current) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Provider protocol version too old\n");
GNUNET_break_op (0);
response_code = 0;
GNUNET_JSON_parse_free (spec);
break;
}
}
if ( (GNUNET_OK !=
TALER_amount_cmp_currency (&acfg.liability_limit,
&acfg.annual_fee)) ||
(0 !=
strcasecmp (acfg.currency,
acfg.annual_fee.currency)) )
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
response_code = 0;
break;
}
if (! json_is_array (methods))
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
response_code = 0;
break;
}
acfg.methods_length = json_array_size (methods);
{
struct ANASTASIS_AuthorizationMethodConfig mcfg[GNUNET_NZL (
acfg.methods_length)];
for (unsigned int i = 0; itype),
TALER_JSON_spec_amount_any ("cost",
&m->usage_fee),
GNUNET_JSON_spec_end ()
};
if ( (GNUNET_OK !=
GNUNET_JSON_parse (json_array_get (methods,
i),
spec,
NULL, NULL)) )
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
response_code = 0;
goto end;
}
}
acfg.methods = mcfg;
co->cb (co->cb_cls,
MHD_HTTP_OK,
&acfg);
GNUNET_JSON_parse_free (spec);
ANASTASIS_config_cancel (co);
return;
}
}
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the anastasis server is buggy
(or API version conflict); just pass JSON reply to the application */
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify */
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
GNUNET_break_op (0);
break;
}
end:
co->cb (co->cb_cls,
response_code,
NULL);
ANASTASIS_config_cancel (co);
}
struct ANASTASIS_ConfigOperation *
ANASTASIS_get_config (struct GNUNET_CURL_Context *ctx,
const char *base_url,
ANASTASIS_ConfigCallback cb,
void *cb_cls)
{
struct ANASTASIS_ConfigOperation *co;
co = GNUNET_new (struct ANASTASIS_ConfigOperation);
co->url = TALER_url_join (base_url,
"config",
NULL);
co->ctx = ctx;
co->cb = cb;
co->cb_cls = cb_cls;
{
CURL *eh;
eh = ANASTASIS_curl_easy_get_ (co->url);
co->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_config_finished,
co);
}
if (NULL == co->job)
{
GNUNET_free (co->url);
GNUNET_free (co);
return NULL;
}
return co;
}
void
ANASTASIS_config_cancel (struct ANASTASIS_ConfigOperation *co)
{
if (NULL != co->job)
{
GNUNET_CURL_job_cancel (co->job);
co->job = NULL;
}
GNUNET_free (co->url);
GNUNET_free (co);
}
/* end of anastasis_api_config.c */