/*
This file is part of ANASTASIS
Copyright (C) 2022 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 2.1,
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.LGPL. If not,
see
*/
/**
* @file restclient/anastasis_api_policy_meta_lookup.c
* @brief Implementation of the /policy/$POL/meta GET request
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include /* just for HTTP status codes */
#include "anastasis_service.h"
#include "anastasis_api_curl_defaults.h"
#include
#include
/**
* @brief A Meta Operation Handle
*/
struct ANASTASIS_PolicyMetaLookupOperation
{
/**
* The url for this request, including parameters.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
ANASTASIS_PolicyMetaLookupCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Public key of the account we are downloading from.
*/
struct ANASTASIS_CRYPTO_AccountPublicKeyP account_pub;
/**
* Maximum version to fetch.
*/
uint32_t max_version;
};
/**
* Process GET /policy/$POL/meta response
*
* @param cls our `struct ANASTASIS_PolicyMetaLookupOperation *`
* @param response_code HTTP status
* @param data response body, a `json_t *`, NULL on error
*/
static void
handle_policy_meta_lookup_finished (void *cls,
long response_code,
const void *response)
{
struct ANASTASIS_PolicyMetaLookupOperation *plo = cls;
const json_t *json = response;
plo->job = NULL;
switch (response_code)
{
case 0:
/* Hard error */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Backend didn't even return from GET /policy\n");
break;
case MHD_HTTP_OK:
{
size_t mlen = json_object_size (json);
/* put a cap, as we will stack-allocate below and the
current service LIMITs the result to 1000 anyway;
could theoretically be increased in the future, but
then we should not put this onto the stack anymore... */
if (mlen > 10000)
{
GNUNET_break (0);
response_code = 0;
break;
}
{
struct ANASTASIS_MetaDataEntry metas[GNUNET_NZL (mlen)];
void *md[GNUNET_NZL (mlen)];
struct ANASTASIS_MetaDownloadDetails mdd = {
.metas = metas,
.metas_length = mlen
};
size_t off = 0;
const char *label;
const json_t *val;
memset (md,
0,
sizeof (md));
json_object_foreach ((json_t *) json,
label,
val)
{
unsigned int ver;
char dummy;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_varsize ("meta",
&md[off],
&metas[off].meta_data_size),
GNUNET_JSON_spec_timestamp ("upload_time",
&metas[off].server_time),
GNUNET_JSON_spec_end ()
};
if (1 != sscanf (label,
"%u%c",
&ver,
&dummy))
{
GNUNET_break (0);
break;
}
if (GNUNET_OK !=
GNUNET_JSON_parse (val,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
break;
}
metas[off].version = (uint32_t) ver;
metas[off].meta_data = md[off];
off++;
}
if (off < mlen)
{
GNUNET_break (0);
response_code = 0;
for (size_t i = 0; icb (plo->cb_cls,
response_code,
&mdd);
for (size_t i = 0; icb = NULL;
}
ANASTASIS_policy_meta_lookup_cancel (plo);
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 (0);
response_code = 0;
break;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"HTTP status for policy meta lookup is %u\n",
(unsigned int) response_code);
plo->cb (plo->cb_cls,
response_code,
NULL);
plo->cb = NULL;
ANASTASIS_policy_meta_lookup_cancel (plo);
}
struct ANASTASIS_PolicyMetaLookupOperation *
ANASTASIS_policy_meta_lookup (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct ANASTASIS_CRYPTO_AccountPublicKeyP *anastasis_pub,
uint32_t max_version,
ANASTASIS_PolicyMetaLookupCallback cb,
void *cb_cls)
{
struct ANASTASIS_PolicyMetaLookupOperation *plo;
CURL *eh;
char *path;
// FIXME: pass 'max_version' in CURL request!
GNUNET_assert (NULL != cb);
plo = GNUNET_new (struct ANASTASIS_PolicyMetaLookupOperation);
plo->account_pub = *anastasis_pub;
{
char *acc_pub_str;
acc_pub_str = GNUNET_STRINGS_data_to_string_alloc (anastasis_pub,
sizeof (*anastasis_pub));
GNUNET_asprintf (&path,
"policy/%s/meta",
acc_pub_str);
GNUNET_free (acc_pub_str);
}
plo->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
eh = ANASTASIS_curl_easy_get_ (plo->url);
GNUNET_assert (NULL != eh);
plo->cb = cb;
plo->cb_cls = cb_cls;
plo->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_policy_meta_lookup_finished,
plo);
return plo;
}
void
ANASTASIS_policy_meta_lookup_cancel (
struct ANASTASIS_PolicyMetaLookupOperation *plo)
{
if (NULL != plo->job)
{
GNUNET_CURL_job_cancel (plo->job);
plo->job = NULL;
}
GNUNET_free (plo->url);
GNUNET_free (plo);
}