/*
This file is part of Anastasis
Copyright (C) 2020, 2021, 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 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_truth_solve.c
* @brief Implementation of the POST /truth/$TID/solve request
* @author Christian Grothoff
* @author Dennis Neufeld
* @author Dominik Meister
*/
#include "platform.h"
#include
#include
#include /* just for HTTP status codes */
#include "anastasis_service.h"
#include "anastasis_api_curl_defaults.h"
#include
#include
#include
/**
* @brief A Contract Operation Handle
*/
struct ANASTASIS_TruthSolveOperation
{
/**
* The url for this request, including parameters.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
ANASTASIS_TruthSolveCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Context for #TEH_curl_easy_post(). Keeps the data that must
* persist for Curl to make the upload.
*/
struct TALER_CURL_PostContext ctx;
/**
* Payment URI we received from the service, or NULL.
*/
char *pay_uri;
/**
* Content type of the body.
*/
char *content_type;
};
void
ANASTASIS_truth_solve_cancel (
struct ANASTASIS_TruthSolveOperation *tso)
{
if (NULL != tso->job)
{
GNUNET_CURL_job_cancel (tso->job);
tso->job = NULL;
}
GNUNET_free (tso->pay_uri);
GNUNET_free (tso->url);
GNUNET_free (tso->content_type);
TALER_curl_easy_post_finished (&tso->ctx);
GNUNET_free (tso);
}
/**
* Process POST /truth/$TID/solve response
*
* @param cls our `struct ANASTASIS_TruthSolveOperation *`
* @param response_code the HTTP status
* @param data the body of the response
* @param data_size number of bytes in @a data
*/
static void
handle_truth_solve_finished (void *cls,
long response_code,
const void *data,
size_t data_size)
{
struct ANASTASIS_TruthSolveOperation *tso = cls;
struct ANASTASIS_TruthSolveReply tsr = {
.http_status = response_code
};
tso->job = NULL;
switch (response_code)
{
case 0:
/* Hard error */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Backend didn't even return from POST /truth/$TID/solve\n");
tsr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
if (sizeof (tsr.details.success.eks) != data_size)
{
GNUNET_break_op (0);
tsr.http_status = 0;
tsr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
/* Success, call callback with all details! */
memcpy (&tsr.details.success.eks,
data,
data_size);
break;
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 */
GNUNET_break (0);
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
case MHD_HTTP_PAYMENT_REQUIRED:
{
struct TALER_MERCHANT_PayUriData pd;
if ( (NULL == tso->pay_uri) ||
(GNUNET_OK !=
TALER_MERCHANT_parse_pay_uri (tso->pay_uri,
&pd)) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to parse `%s'\n",
tso->pay_uri);
tsr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (
pd.order_id,
strlen (pd.order_id),
&tsr.details.payment_required.ps,
sizeof (tsr.details.payment_required.ps)))
{
GNUNET_break (0);
tsr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
TALER_MERCHANT_parse_pay_uri_free (&pd);
break;
}
tsr.details.payment_required.pd = &pd;
tsr.details.payment_required.payment_request = tso->pay_uri;
tso->cb (tso->cb_cls,
&tsr);
TALER_MERCHANT_parse_pay_uri_free (&pd);
ANASTASIS_truth_solve_cancel (tso);
return;
}
break;
case MHD_HTTP_FORBIDDEN:
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
case MHD_HTTP_NOT_FOUND:
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
case MHD_HTTP_REQUEST_TIMEOUT:
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
case MHD_HTTP_TOO_MANY_REQUESTS:
{
json_t *reply;
reply = json_loadb (data,
data_size,
JSON_REJECT_DUPLICATES,
NULL);
if (NULL == reply)
{
GNUNET_break_op (0);
tsr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_uint32 (
"request_limit",
&tsr.details.too_many_requests.request_limit),
GNUNET_JSON_spec_relative_time (
"request_frequency",
&tsr.details.too_many_requests.request_frequency),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (reply,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
tsr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
json_decref (reply);
break;
}
json_decref (reply);
break;
}
}
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
case MHD_HTTP_BAD_GATEWAY:
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
break;
default:
/* unexpected response code */
tsr.ec = TALER_JSON_get_error_code2 (data,
data_size);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d to POST /truth/$TID/solve\n",
(unsigned int) response_code,
(int) tsr.ec);
break;
}
tso->cb (tso->cb_cls,
&tsr);
ANASTASIS_truth_solve_cancel (tso);
}
/**
* Patch value in @a val, replacing new line with '\0'.
*
* @param[in,out] val 0-terminated string to replace '\\n' and '\\r' with '\\0' in.
*/
static void
patch_value (char *val)
{
size_t len;
/* found location URI we care about! */
len = strlen (val);
while ( (len > 0) &&
( ('\n' == val[len - 1]) ||
('\r' == val[len - 1]) ) )
{
len--;
val[len] = '\0';
}
}
/**
* Handle HTTP header received by curl.
*
* @param buffer one line of HTTP header data
* @param size size of an item
* @param nitems number of items passed
* @param userdata our `struct ANASTASIS_StorePolicyOperation *`
* @return `size * nitems`
*/
static size_t
handle_header (char *buffer,
size_t size,
size_t nitems,
void *userdata)
{
struct ANASTASIS_TruthSolveOperation *tso = userdata;
size_t total = size * nitems;
char *ndup;
const char *hdr_type;
char *hdr_val;
char *sp;
ndup = GNUNET_strndup (buffer,
total);
hdr_type = strtok_r (ndup,
":",
&sp);
if (NULL == hdr_type)
{
GNUNET_free (ndup);
return total;
}
hdr_val = strtok_r (NULL,
"",
&sp);
if (NULL == hdr_val)
{
GNUNET_free (ndup);
return total;
}
if (' ' == *hdr_val)
hdr_val++;
if (0 == strcasecmp (hdr_type,
ANASTASIS_HTTP_HEADER_TALER))
{
/* found payment URI we care about! */
GNUNET_free (tso->pay_uri);
tso->pay_uri = GNUNET_strdup (hdr_val);
patch_value (tso->pay_uri);
}
if (0 == strcasecmp (hdr_type,
MHD_HTTP_HEADER_CONTENT_TYPE))
{
/* found location URI we care about! */
GNUNET_free (tso->content_type);
tso->content_type = GNUNET_strdup (hdr_val);
patch_value (tso->content_type);
}
GNUNET_free (ndup);
return total;
}
struct ANASTASIS_TruthSolveOperation *
ANASTASIS_truth_solve (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct ANASTASIS_CRYPTO_TruthUUIDP *truth_uuid,
const struct ANASTASIS_CRYPTO_TruthKeyP *truth_key,
const struct ANASTASIS_PaymentSecretP *payment_secret,
struct GNUNET_TIME_Relative timeout,
const struct GNUNET_HashCode *hashed_answer,
ANASTASIS_TruthSolveCallback cb,
void *cb_cls)
{
struct ANASTASIS_TruthSolveOperation *tso;
CURL *eh;
char *path;
unsigned long long tms;
json_t *body;
body = GNUNET_JSON_PACK (
GNUNET_JSON_pack_data_auto ("truth_decryption_key",
truth_key),
GNUNET_JSON_pack_data_auto ("h_response",
hashed_answer),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_data_auto ("payment_secret",
payment_secret)));
GNUNET_assert (NULL != body);
tms = (unsigned long long) (timeout.rel_value_us
/ GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us);
tso = GNUNET_new (struct ANASTASIS_TruthSolveOperation);
tso->cb = cb;
tso->cb_cls = cb_cls;
{
char *uuid_str;
uuid_str = GNUNET_STRINGS_data_to_string_alloc (truth_uuid,
sizeof (*truth_uuid));
GNUNET_asprintf (&path,
"truth/%s/solve",
uuid_str);
GNUNET_free (uuid_str);
}
{
char timeout_ms[32];
GNUNET_snprintf (timeout_ms,
sizeof (timeout_ms),
"%llu",
tms);
tso->url = TALER_url_join (backend_url,
path,
"timeout_ms",
(! GNUNET_TIME_relative_is_zero (timeout))
? timeout_ms
: NULL,
NULL);
}
GNUNET_free (path);
eh = ANASTASIS_curl_easy_get_ (tso->url);
if ( (NULL == eh) ||
(GNUNET_OK !=
TALER_curl_easy_post (&tso->ctx,
eh,
body)) )
{
GNUNET_break (0);
if (NULL != eh)
curl_easy_cleanup (eh);
json_decref (body);
GNUNET_free (tso->url);
GNUNET_free (tso);
return NULL;
}
json_decref (body);
if (0 != tms)
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_TIMEOUT_MS,
(long) (tms + 5000)));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERFUNCTION,
&handle_header));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERDATA,
tso));
tso->job = GNUNET_CURL_job_add_raw (ctx,
eh,
tso->ctx.headers,
&handle_truth_solve_finished,
tso);
return tso;
}
/* end of anastasis_api_truth_solve.c */