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/*
This file is part of TALER
Copyright (C) 2014-2021 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
TALER; see the file COPYING.LGPL. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file merchant_api_post_instance_auth.c
* @brief Implementation of the POST /instance/$ID/private/auth request
* @author Christian Grothoff
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
#include <taler/taler_curl_lib.h>
/**
* Handle for a POST /instances/$ID/private/auth operation.
*/
struct TALER_MERCHANT_InstanceAuthPostHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_InstanceAuthPostCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Minor context that holds body and headers.
*/
struct TALER_CURL_PostContext post_ctx;
};
/**
* Function called when we're done processing the
* HTTP GET /instances/$ID/private/auth request.
*
* @param cls the `struct TALER_MERCHANT_InstanceAuthPostHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not in JSON
*/
static void
handle_post_instance_auth_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_InstanceAuthPostHandle *iaph = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
iaph->job = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got /instances/$ID response with status code %u\n",
(unsigned int) response_code);
switch (response_code)
{
case MHD_HTTP_NO_CONTENT:
break;
case MHD_HTTP_BAD_REQUEST:
/* happens if the auth token is malformed */
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
case MHD_HTTP_UNAUTHORIZED:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
default:
/* unexpected response code */
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d\n",
(unsigned int) response_code,
(int) hr.ec);
break;
}
iaph->cb (iaph->cb_cls,
&hr);
TALER_MERCHANT_instance_auth_post_cancel (iaph);
}
struct TALER_MERCHANT_InstanceAuthPostHandle *
TALER_MERCHANT_instance_auth_post (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *instance_id,
const char *auth_token,
TALER_MERCHANT_InstanceAuthPostCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_InstanceAuthPostHandle *iaph;
json_t *req_obj;
iaph = GNUNET_new (struct TALER_MERCHANT_InstanceAuthPostHandle);
iaph->ctx = ctx;
iaph->cb = cb;
iaph->cb_cls = cb_cls;
if (NULL != instance_id)
{
char *path;
GNUNET_asprintf (&path,
"private/instances/%s/auth",
instance_id);
iaph->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
}
else
{
/* backend_url is already identifying the instance */
iaph->url = TALER_url_join (backend_url,
"private/auth",
NULL);
}
if (NULL == iaph->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (iaph);
return NULL;
}
if (NULL == auth_token)
{
req_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("method",
"external"));
}
else
{
req_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("method",
"token"),
GNUNET_JSON_pack_string ("token",
auth_token));
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting URL '%s'\n",
iaph->url);
{
CURL *eh;
eh = curl_easy_init ();
GNUNET_assert (NULL != eh);
if (GNUNET_OK !=
TALER_curl_easy_post (&iaph->post_ctx,
eh,
req_obj))
{
GNUNET_break (0);
json_decref (req_obj);
GNUNET_free (iaph->url);
GNUNET_free (iaph);
return NULL;
}
json_decref (req_obj);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
iaph->url));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_CUSTOMREQUEST,
MHD_HTTP_METHOD_POST));
iaph->job = GNUNET_CURL_job_add2 (ctx,
eh,
iaph->post_ctx.headers,
&handle_post_instance_auth_finished,
iaph);
}
return iaph;
}
void
TALER_MERCHANT_instance_auth_post_cancel (
struct TALER_MERCHANT_InstanceAuthPostHandle *iaph)
{
if (NULL != iaph->job)
GNUNET_CURL_job_cancel (iaph->job);
TALER_curl_easy_post_finished (&iaph->post_ctx);
GNUNET_free (iaph->url);
GNUNET_free (iaph);
}
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