skeleton for GET /purses/ client
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Christian Grothoff
parent
1002ac13e4
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ae2f1ced8b
244
src/lib/exchange_api_purses_get.c
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244
src/lib/exchange_api_purses_get.c
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/*
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This file is part of TALER
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Copyright (C) 2022 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file lib/exchange_api_purses_get.c
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* @brief Implementation of the /purses/ GET request
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <jansson.h>
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#include <microhttpd.h> /* just for HTTP status codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_json_lib.h"
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#include "taler_exchange_service.h"
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#include "exchange_api_handle.h"
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#include "taler_signatures.h"
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#include "exchange_api_curl_defaults.h"
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/**
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* @brief A Contract Get Handle
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*/
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struct TALER_EXCHANGE_PursesGetHandle
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{
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/**
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* The connection to exchange this request handle will use
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*/
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struct TALER_EXCHANGE_Handle *exchange;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Function to call with the result.
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*/
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TALER_EXCHANGE_PurseGetCallback cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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};
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/**
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* Function called when we're done processing the
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* HTTP /purses/$PID GET request.
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*
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* @param cls the `struct TALER_EXCHANGE_PursesGetHandle`
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* @param response_code HTTP response code, 0 on error
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* @param response parsed JSON result, NULL on error
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*/
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static void
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handle_purse_get_finished (void *cls,
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long response_code,
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const void *response)
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{
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struct TALER_EXCHANGE_PursesGetHandle *cgh = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_PurseGetResponse dr = {
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.hr.reply = j,
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.hr.http_status = (unsigned int) response_code
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};
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cgh->job = NULL;
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switch (response_code)
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{
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case 0:
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dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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{
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_timestamp ("merge_timestamp",
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&dr.details.success.merge_timestamp),
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GNUNET_JSON_spec_timestamp ("deposit_timestamp",
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&dr.details.success.deposit_timestamp),
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GNUNET_JSON_spec_end ()
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};
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if (GNUNET_OK !=
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GNUNET_JSON_parse (j,
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spec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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dr.hr.http_status = 0;
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dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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break;
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}
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cgh->cb (cgh->cb_cls,
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&dr);
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TALER_EXCHANGE_purse_get_cancel (cgh);
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return;
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}
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case MHD_HTTP_BAD_REQUEST:
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dr.hr.ec = TALER_JSON_get_error_code (j);
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dr.hr.hint = TALER_JSON_get_error_hint (j);
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/* This should never happen, either us or the exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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break;
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case MHD_HTTP_FORBIDDEN:
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dr.hr.ec = TALER_JSON_get_error_code (j);
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dr.hr.hint = TALER_JSON_get_error_hint (j);
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/* Nothing really to verify, exchange says one of the signatures is
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invalid; as we checked them, this should never happen, we
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should pass the JSON reply to the application */
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break;
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case MHD_HTTP_NOT_FOUND:
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dr.hr.ec = TALER_JSON_get_error_code (j);
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dr.hr.hint = TALER_JSON_get_error_hint (j);
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/* Exchange does not know about transaction;
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we should pass the reply to the application */
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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dr.hr.ec = TALER_JSON_get_error_code (j);
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dr.hr.hint = TALER_JSON_get_error_hint (j);
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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break;
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default:
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/* unexpected response code */
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dr.hr.ec = TALER_JSON_get_error_code (j);
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dr.hr.hint = TALER_JSON_get_error_hint (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for exchange GET purses\n",
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(unsigned int) response_code,
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(int) dr.hr.ec);
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GNUNET_break_op (0);
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break;
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}
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cgh->cb (cgh->cb_cls,
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&dr);
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TALER_EXCHANGE_purse_get_cancel (cgh);
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}
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struct TALER_EXCHANGE_PursesGetHandle *
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TALER_EXCHANGE_purse_get (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_PurseContractPrivateKeyP *purse_priv,
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struct GNUNET_TIME_Relative merge_timeout,
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struct GNUNET_TIME_Relative deposit_timeout,
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TALER_EXCHANGE_PurseGetCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_PursesGetHandle *cgh;
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CURL *eh;
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struct TALER_PurseContractPublicKeyP purse_pub;
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char arg_str[sizeof (purse_pub) * 2 + 48];
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if (GNUNET_YES !=
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TEAH_handle_is_ready (exchange))
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{
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GNUNET_break (0);
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return NULL;
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}
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cgh = GNUNET_new (struct TALER_EXCHANGE_PursesGetHandle);
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cgh->exchange = exchange;
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cgh->cb = cb;
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cgh->cb_cls = cb_cls;
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GNUNET_CRYPTO_ecdhe_key_get_public (&purse_priv->ecdhe_priv,
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&purse_pub.ecdhe_pub);
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{
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char cpub_str[sizeof (purse_pub) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (&purse_pub,
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sizeof (purse_pub),
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cpub_str,
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sizeof (cpub_str));
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*end = '\0';
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GNUNET_snprintf (arg_str,
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sizeof (arg_str),
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"/purses/%s",
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cpub_str);
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}
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cgh->url = TEAH_path_to_url (exchange,
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arg_str);
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if (NULL == cgh->url)
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{
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GNUNET_free (cgh);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (cgh->url);
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if (NULL == eh)
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{
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GNUNET_break (0);
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GNUNET_free (cgh->url);
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GNUNET_free (cgh);
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return NULL;
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}
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/* FIXME: add signature with purse_priv
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to authorize the GET request!? Or
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decide it is non-critical and only
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pass purse_pub? */
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cgh->job = GNUNET_CURL_job_add (TEAH_handle_to_context (exchange),
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eh,
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&handle_purse_get_finished,
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cgh);
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return cgh;
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}
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void
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TALER_EXCHANGE_purse_get_cancel (
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struct TALER_EXCHANGE_PursesGetHandle *cgh)
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{
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if (NULL != cgh->job)
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{
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GNUNET_CURL_job_cancel (cgh->job);
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cgh->job = NULL;
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}
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GNUNET_free (cgh->url);
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GNUNET_free (cgh);
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}
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/* end of exchange_api_purses_get.c */
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