418 lines
13 KiB
C
418 lines
13 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014-2020 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_deposits_get.c
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* @brief Implementation of the /deposits/ 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 Deposit Wtid Handle
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*/
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struct TALER_EXCHANGE_DepositGetHandle
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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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* Context for #TEH_curl_easy_post(). Keeps the data that must
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* persist for Curl to make the upload.
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*/
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struct TALER_CURL_PostContext ctx;
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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_DepositGetCallback 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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* Information the exchange should sign in response.
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* (with pre-filled fields from the request).
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*/
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struct TALER_ConfirmWirePS depconf;
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};
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/**
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* Verify that the signature on the "200 OK" response
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* from the exchange is valid.
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*
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* @param dwh deposit wtid handle
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* @param json json reply with the signature
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* @param[out] exchange_pub set to the exchange's public key
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* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
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*/
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static int
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verify_deposit_wtid_signature_ok (
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const struct TALER_EXCHANGE_DepositGetHandle *dwh,
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const json_t *json,
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struct TALER_ExchangePublicKeyP *exchange_pub)
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{
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struct TALER_ExchangeSignatureP exchange_sig;
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const struct TALER_EXCHANGE_Keys *key_state;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
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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 (json,
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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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return GNUNET_SYSERR;
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}
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key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
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if (GNUNET_OK !=
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TALER_EXCHANGE_test_signing_key (key_state,
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exchange_pub))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE,
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&dwh->depconf.purpose,
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&exchange_sig.eddsa_signature,
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&exchange_pub->eddsa_pub))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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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 /track/transaction request.
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*
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* @param cls the `struct TALER_EXCHANGE_DepositGetHandle`
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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_deposit_wtid_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_DepositGetHandle *dwh = cls;
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const struct TALER_WireTransferIdentifierRawP *wtid = NULL;
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struct GNUNET_TIME_Absolute execution_time = GNUNET_TIME_UNIT_FOREVER_ABS;
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const struct TALER_Amount *coin_contribution = NULL;
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struct TALER_Amount coin_contribution_s;
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struct TALER_ExchangePublicKeyP exchange_pub;
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struct TALER_ExchangePublicKeyP *ep = NULL;
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const json_t *j = response;
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enum TALER_ErrorCode ec;
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dwh->job = NULL;
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switch (response_code)
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{
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case 0:
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ec = TALER_EC_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_fixed_auto ("wtid", &dwh->depconf.wtid),
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GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
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TALER_JSON_spec_amount ("coin_contribution", &coin_contribution_s),
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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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response_code = 0;
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ec = TALER_EC_DEPOSITS_INVALID_BODY_BY_EXCHANGE;
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break;
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}
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wtid = &dwh->depconf.wtid;
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dwh->depconf.execution_time = GNUNET_TIME_absolute_hton (execution_time);
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TALER_amount_hton (&dwh->depconf.coin_contribution,
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&coin_contribution_s);
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coin_contribution = &coin_contribution_s;
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if (GNUNET_OK !=
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verify_deposit_wtid_signature_ok (dwh,
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j,
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&exchange_pub))
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{
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GNUNET_break_op (0);
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response_code = 0;
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ec = TALER_EC_DEPOSITS_INVALID_SIGNATURE_BY_EXCHANGE;
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}
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else
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{
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ep = &exchange_pub;
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ec = TALER_EC_NONE;
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}
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}
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break;
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case MHD_HTTP_ACCEPTED:
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{
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/* Transaction known, but not executed yet */
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
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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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response_code = 0;
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ec = TALER_EC_DEPOSITS_INVALID_BODY_BY_EXCHANGE;
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break;
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}
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ec = TALER_EC_NONE;
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}
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break;
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case MHD_HTTP_BAD_REQUEST:
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ec = TALER_JSON_get_error_code (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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ec = TALER_JSON_get_error_code (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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ec = TALER_JSON_get_error_code (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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ec = TALER_JSON_get_error_code (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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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u\n",
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(unsigned int) response_code);
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GNUNET_break (0);
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ec = TALER_JSON_get_error_code (j);
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response_code = 0;
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break;
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}
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dwh->cb (dwh->cb_cls,
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response_code,
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ec,
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ep,
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j,
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wtid,
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execution_time,
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coin_contribution);
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TALER_EXCHANGE_deposits_get_cancel (dwh);
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}
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/**
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* Obtain wire transfer details about an existing deposit operation.
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*
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* @param exchange the exchange to query
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* @param merchant_priv the merchant's private key
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* @param h_wire hash of merchant's wire transfer details
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* @param h_contract_terms hash of the proposal data from the contract
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* between merchant and customer
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* @param coin_pub public key of the coin
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* @param cb function to call with the result
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* @param cb_cls closure for @a cb
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* @return handle to abort request
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*/
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struct TALER_EXCHANGE_DepositGetHandle *
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TALER_EXCHANGE_deposits_get (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_MerchantPrivateKeyP *merchant_priv,
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const struct GNUNET_HashCode *h_wire,
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const struct GNUNET_HashCode *h_contract_terms,
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const struct TALER_CoinSpendPublicKeyP *coin_pub,
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TALER_EXCHANGE_DepositGetCallback cb,
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void *cb_cls)
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{
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struct TALER_DepositTrackPS dtp;
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struct TALER_MerchantSignatureP merchant_sig;
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struct TALER_EXCHANGE_DepositGetHandle *dwh;
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struct GNUNET_CURL_Context *ctx;
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CURL *eh;
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char arg_str[(sizeof (struct TALER_CoinSpendPublicKeyP)
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+ sizeof (struct GNUNET_HashCode)
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+ sizeof (struct TALER_MerchantPublicKeyP)
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+ sizeof (struct GNUNET_HashCode)
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+ sizeof (struct TALER_MerchantSignatureP)) * 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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dtp.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION);
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dtp.purpose.size = htonl (sizeof (dtp));
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dtp.h_contract_terms = *h_contract_terms;
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dtp.h_wire = *h_wire;
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GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
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&dtp.merchant.eddsa_pub);
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dtp.coin_pub = *coin_pub;
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GNUNET_assert (GNUNET_OK ==
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GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv,
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&dtp.purpose,
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&merchant_sig.eddsa_sig));
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{
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char cpub_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2];
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char mpub_str[sizeof (struct TALER_MerchantPublicKeyP) * 2];
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char msig_str[sizeof (struct TALER_MerchantSignatureP) * 2];
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char chash_str[sizeof (struct GNUNET_HashCode) * 2];
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char whash_str[sizeof (struct GNUNET_HashCode) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (h_wire,
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sizeof (struct
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GNUNET_HashCode),
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whash_str,
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sizeof (whash_str));
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*end = '\0';
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end = GNUNET_STRINGS_data_to_string (&dtp.merchant,
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sizeof (struct
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TALER_MerchantPublicKeyP),
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mpub_str,
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sizeof (mpub_str));
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*end = '\0';
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end = GNUNET_STRINGS_data_to_string (h_contract_terms,
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sizeof (struct
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GNUNET_HashCode),
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chash_str,
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sizeof (chash_str));
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*end = '\0';
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end = GNUNET_STRINGS_data_to_string (coin_pub,
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sizeof (struct
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TALER_CoinSpendPublicKeyP),
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cpub_str,
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sizeof (cpub_str));
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*end = '\0';
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end = GNUNET_STRINGS_data_to_string (&merchant_sig,
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sizeof (struct
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TALER_MerchantSignatureP),
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msig_str,
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sizeof (msig_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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"/deposits/%s/%s/%s/%s?merchant_sig=%s",
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whash_str,
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mpub_str,
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chash_str,
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cpub_str,
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msig_str);
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}
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dwh = GNUNET_new (struct TALER_EXCHANGE_DepositGetHandle);
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dwh->exchange = exchange;
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dwh->cb = cb;
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dwh->cb_cls = cb_cls;
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dwh->url = TEAH_path_to_url (exchange,
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arg_str);
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dwh->depconf.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
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dwh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
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dwh->depconf.h_wire = *h_wire;
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dwh->depconf.h_contract_terms = *h_contract_terms;
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dwh->depconf.coin_pub = *coin_pub;
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eh = TALER_EXCHANGE_curl_easy_get_ (dwh->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 (dwh->url);
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GNUNET_free (dwh);
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return NULL;
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}
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ctx = TEAH_handle_to_context (exchange);
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dwh->job = GNUNET_CURL_job_add (ctx,
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eh,
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GNUNET_NO,
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&handle_deposit_wtid_finished,
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dwh);
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return dwh;
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}
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/**
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* Cancel /deposits/$WTID request. This function cannot be used on a request
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* handle if a response is already served for it.
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*
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* @param dwh the wire deposits request handle
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*/
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void
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TALER_EXCHANGE_deposits_get_cancel (struct TALER_EXCHANGE_DepositGetHandle *dwh)
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{
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if (NULL != dwh->job)
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{
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GNUNET_CURL_job_cancel (dwh->job);
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dwh->job = NULL;
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}
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GNUNET_free (dwh->url);
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TALER_curl_easy_post_finished (&dwh->ctx);
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GNUNET_free (dwh);
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}
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/* end of exchange_api_deposits_get.c */
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