From 0a2b049864c8dae0c53c203d46fca89e0e66849d Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Sat, 29 Feb 2020 16:42:10 +0100 Subject: big rename fest related to #6067 API renaming --- src/lib/exchange_api_transfers_get.c | 400 +++++++++++++++++++++++++++++++++++ 1 file changed, 400 insertions(+) create mode 100644 src/lib/exchange_api_transfers_get.c (limited to 'src/lib/exchange_api_transfers_get.c') diff --git a/src/lib/exchange_api_transfers_get.c b/src/lib/exchange_api_transfers_get.c new file mode 100644 index 000000000..8ea8918ca --- /dev/null +++ b/src/lib/exchange_api_transfers_get.c @@ -0,0 +1,400 @@ +/* + This file is part of TALER + Copyright (C) 2014-2020 Taler Systems SA + + TALER 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. + + 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 General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see + +*/ +/** + * @file lib/exchange_api_transfers_get.c + * @brief Implementation of the GET /transfers/ request + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include /* just for HTTP status codes */ +#include +#include +#include "taler_exchange_service.h" +#include "taler_json_lib.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A /transfers/ GET Handle + */ +struct TALER_EXCHANGE_TransfersGetHandle +{ + + /** + * The connection to exchange this request handle will use + */ + struct TALER_EXCHANGE_Handle *exchange; + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_TransfersGetCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + +}; + + +/** + * We got a #MHD_HTTP_OK response for the /transfers/ request. + * Check that the response is well-formed and if it is, call the + * callback. If not, return an error code. + * + * This code is very similar to + * merchant_api_track_transfer.c::check_transfers_get_response_ok. + * Any changes should likely be reflected there as well. + * + * @param wdh handle to the operation + * @param json response we got + * @return #GNUNET_OK if we are done and all is well, + * #GNUNET_SYSERR if the response was bogus + */ +static int +check_transfers_get_response_ok (struct + TALER_EXCHANGE_TransfersGetHandle *wdh, + const json_t *json) +{ + json_t *details_j; + struct GNUNET_HashCode h_wire; + struct GNUNET_TIME_Absolute exec_time; + struct TALER_Amount total_amount; + struct TALER_Amount total_expected; + struct TALER_Amount wire_fee; + struct TALER_MerchantPublicKeyP merchant_pub; + unsigned int num_details; + struct TALER_ExchangePublicKeyP exchange_pub; + struct TALER_ExchangeSignatureP exchange_sig; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount ("total", &total_amount), + TALER_JSON_spec_amount ("wire_fee", &wire_fee), + GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub), + GNUNET_JSON_spec_fixed_auto ("h_wire", &h_wire), + GNUNET_JSON_spec_absolute_time ("execution_time", &exec_time), + GNUNET_JSON_spec_json ("deposits", &details_j), + GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig), + GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + TALER_amount_get_zero (total_amount.currency, + &total_expected)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + num_details = json_array_size (details_j); + { + struct TALER_TrackTransferDetails details[num_details]; + unsigned int i; + struct GNUNET_HashContext *hash_context; + struct TALER_WireDepositDetailP dd; + struct TALER_WireDepositDataPS wdp; + + hash_context = GNUNET_CRYPTO_hash_context_start (); + for (i = 0; ih_contract_terms), + GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub), + TALER_JSON_spec_amount ("deposit_value", &detail->coin_value), + TALER_JSON_spec_amount ("deposit_fee", &detail->coin_fee), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (detail_j, + spec_detail, + NULL, NULL)) + { + GNUNET_break_op (0); + GNUNET_CRYPTO_hash_context_abort (hash_context); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + /* build up big hash for signature checking later */ + dd.h_contract_terms = detail->h_contract_terms; + dd.execution_time = GNUNET_TIME_absolute_hton (exec_time); + dd.coin_pub = detail->coin_pub; + TALER_amount_hton (&dd.deposit_value, + &detail->coin_value); + TALER_amount_hton (&dd.deposit_fee, + &detail->coin_fee); + if ( (GNUNET_OK != + TALER_amount_add (&total_expected, + &total_expected, + &detail->coin_value)) || + (GNUNET_OK != + TALER_amount_subtract (&total_expected, + &total_expected, + &detail->coin_fee)) ) + { + GNUNET_break_op (0); + GNUNET_CRYPTO_hash_context_abort (hash_context); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + GNUNET_CRYPTO_hash_context_read (hash_context, + &dd, + sizeof (struct + TALER_WireDepositDetailP)); + } + /* Check signature */ + wdp.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT); + wdp.purpose.size = htonl (sizeof (struct TALER_WireDepositDataPS)); + TALER_amount_hton (&wdp.total, + &total_amount); + TALER_amount_hton (&wdp.wire_fee, + &wire_fee); + wdp.merchant_pub = merchant_pub; + wdp.h_wire = h_wire; + GNUNET_CRYPTO_hash_context_finish (hash_context, + &wdp.h_details); + if (GNUNET_OK != + TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys ( + wdh->exchange), + &exchange_pub)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + if (GNUNET_OK != GNUNET_CRYPTO_eddsa_verify + (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT, + &wdp.purpose, + &exchange_sig.eddsa_signature, + &exchange_pub.eddsa_pub)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + + if (GNUNET_OK != + TALER_amount_subtract (&total_expected, + &total_expected, + &wire_fee)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + if (0 != + TALER_amount_cmp (&total_expected, + &total_amount)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + wdh->cb (wdh->cb_cls, + MHD_HTTP_OK, + TALER_EC_NONE, + &exchange_pub, + json, + &h_wire, + exec_time, + &total_amount, + &wire_fee, + num_details, + details); + } + GNUNET_JSON_parse_free (spec); + TALER_EXCHANGE_transfers_get_cancel (wdh); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP /transfers/ request. + * + * @param cls the `struct TALER_EXCHANGE_TransfersGetHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_transfers_get_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_TransfersGetHandle *wdh = cls; + const json_t *j = response; + + wdh->job = NULL; + switch (response_code) + { + case 0: + break; + case MHD_HTTP_OK: + if (GNUNET_OK == + check_transfers_get_response_ok (wdh, + j)) + return; + GNUNET_break_op (0); + response_code = 0; + break; + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the exchange is buggy + (or API version conflict); just pass JSON reply to the application */ + break; + case MHD_HTTP_FORBIDDEN: + /* Nothing really to verify, exchange says one of the signatures is + invalid; as we checked them, this should never happen, we + should pass the JSON reply to the application */ + break; + case MHD_HTTP_NOT_FOUND: + /* Exchange does not know about transaction; + we should pass the reply to the application */ + 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; + } + wdh->cb (wdh->cb_cls, + response_code, + TALER_JSON_get_error_code (j), + NULL, + j, + NULL, + GNUNET_TIME_UNIT_ZERO_ABS, + NULL, + NULL, + 0, NULL); + TALER_EXCHANGE_transfers_get_cancel (wdh); +} + + +/** + * Query the exchange about which transactions were combined + * to create a wire transfer. + * + * @param exchange exchange to query + * @param wtid raw wire transfer identifier to get information about + * @param cb callback to call + * @param cb_cls closure for @a cb + * @return handle to cancel operation + */ +struct TALER_EXCHANGE_TransfersGetHandle * +TALER_EXCHANGE_transfers_get (struct TALER_EXCHANGE_Handle *exchange, + const struct + TALER_WireTransferIdentifierRawP *wtid, + TALER_EXCHANGE_TransfersGetCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_TransfersGetHandle *wdh; + struct GNUNET_CURL_Context *ctx; + CURL *eh; + char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32]; + + if (GNUNET_YES != + TEAH_handle_is_ready (exchange)) + { + GNUNET_break (0); + return NULL; + } + + wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle); + wdh->exchange = exchange; + wdh->cb = cb; + wdh->cb_cls = cb_cls; + + { + char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string (wtid, + sizeof (struct + TALER_WireTransferIdentifierRawP), + wtid_str, + sizeof (wtid_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/transfers/%s", + wtid_str); + } + wdh->url = TEAH_path_to_url (wdh->exchange, + arg_str); + eh = TEL_curl_easy_get (wdh->url); + ctx = TEAH_handle_to_context (exchange); + wdh->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_YES, + &handle_transfers_get_finished, + wdh); + return wdh; +} + + +/** + * Cancel wire deposits request. This function cannot be used on a request + * handle if a response is already served for it. + * + * @param wdh the wire deposits request handle + */ +void +TALER_EXCHANGE_transfers_get_cancel (struct + TALER_EXCHANGE_TransfersGetHandle *wdh) +{ + if (NULL != wdh->job) + { + GNUNET_CURL_job_cancel (wdh->job); + wdh->job = NULL; + } + GNUNET_free (wdh->url); + GNUNET_free (wdh); +} + + +/* end of exchange_api_wire_deposits.c */ -- cgit v1.2.3