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Diffstat (limited to 'src/lib/exchange_api_wire.c')
| -rw-r--r-- | src/lib/exchange_api_wire.c | 442 |
1 files changed, 0 insertions, 442 deletions
diff --git a/src/lib/exchange_api_wire.c b/src/lib/exchange_api_wire.c deleted file mode 100644 index 084988058..000000000 --- a/src/lib/exchange_api_wire.c +++ /dev/null @@ -1,442 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2014-2023 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 - <http://www.gnu.org/licenses/> -*/ -/** - * @file lib/exchange_api_wire.c - * @brief Implementation of the /wire request of the exchange's HTTP API - * @author Christian Grothoff - */ -#include "platform.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_exchange_service.h" -#include "taler_json_lib.h" -#include "taler_signatures.h" -#include "exchange_api_handle.h" -#include "exchange_api_curl_defaults.h" - - -/** - * @brief A Wire Handle - */ -struct TALER_EXCHANGE_WireHandle -{ - - /** - * 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_WireCallback cb; - - /** - * Closure for @a cb. - */ - void *cb_cls; - -}; - - -/** - * Frees @a wfm array. - * - * @param wfm fee array to release - * @param wfm_len length of the @a wfm array - */ -static void -free_fees (struct TALER_EXCHANGE_WireFeesByMethod *wfm, - unsigned int wfm_len) -{ - for (unsigned int i = 0; i<wfm_len; i++) - { - struct TALER_EXCHANGE_WireFeesByMethod *wfmi = &wfm[i]; - - while (NULL != wfmi->fees_head) - { - struct TALER_EXCHANGE_WireAggregateFees *fe - = wfmi->fees_head; - - wfmi->fees_head = fe->next; - GNUNET_free (fe); - } - } - GNUNET_free (wfm); -} - - -/** - * Parse wire @a fees and return array. - * - * @param master_pub master public key to use to check signatures - * @param fees json AggregateTransferFee to parse - * @param[out] fees_len set to length of returned array - * @return NULL on error - */ -static struct TALER_EXCHANGE_WireFeesByMethod * -parse_fees (const struct TALER_MasterPublicKeyP *master_pub, - const json_t *fees, - unsigned int *fees_len) -{ - struct TALER_EXCHANGE_WireFeesByMethod *fbm; - unsigned int fbml = json_object_size (fees); - unsigned int i = 0; - const char *key; - const json_t *fee_array; - - fbm = GNUNET_new_array (fbml, - struct TALER_EXCHANGE_WireFeesByMethod); - *fees_len = fbml; - json_object_foreach ((json_t *) fees, key, fee_array) { - struct TALER_EXCHANGE_WireFeesByMethod *fe = &fbm[i++]; - unsigned int idx; - json_t *fee; - - fe->method = key; - fe->fees_head = NULL; - json_array_foreach (fee_array, idx, fee) - { - struct TALER_EXCHANGE_WireAggregateFees *wa - = GNUNET_new (struct TALER_EXCHANGE_WireAggregateFees); - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_fixed_auto ("sig", - &wa->master_sig), - TALER_JSON_spec_amount_any ("wire_fee", - &wa->fees.wire), - TALER_JSON_spec_amount_any ("closing_fee", - &wa->fees.closing), - GNUNET_JSON_spec_timestamp ("start_date", - &wa->start_date), - GNUNET_JSON_spec_timestamp ("end_date", - &wa->end_date), - GNUNET_JSON_spec_end () - }; - - wa->next = fe->fees_head; - fe->fees_head = wa; - if (GNUNET_OK != - GNUNET_JSON_parse (fee, - spec, - NULL, - NULL)) - { - GNUNET_break_op (0); - free_fees (fbm, - i); - return NULL; - } - if (GNUNET_OK != - TALER_exchange_offline_wire_fee_verify ( - key, - wa->start_date, - wa->end_date, - &wa->fees, - master_pub, - &wa->master_sig)) - { - GNUNET_break_op (0); - free_fees (fbm, - i); - return NULL; - } - } /* for all fees over time */ - } /* for all methods */ - GNUNET_assert (i == fbml); - return fbm; -} - - -/** - * Function called when we're done processing the - * HTTP /wire request. - * - * @param cls the `struct TALER_EXCHANGE_WireHandle` - * @param response_code HTTP response code, 0 on error - * @param response parsed JSON result, NULL on error - */ -static void -handle_wire_finished (void *cls, - long response_code, - const void *response) -{ - struct TALER_EXCHANGE_WireHandle *wh = cls; - const json_t *j = response; - struct TALER_EXCHANGE_WireResponse wr = { - .hr.reply = j, - .hr.http_status = (unsigned int) response_code - }; - - TALER_LOG_DEBUG ("Checking raw /wire response\n"); - wh->job = NULL; - switch (response_code) - { - case 0: - wr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; - wh->exchange->wire_error_count++; - break; - case MHD_HTTP_OK: - { - const json_t *accounts; - const json_t *fees; - const json_t *wads; - struct TALER_EXCHANGE_WireFeesByMethod *fbm; - struct TALER_MasterPublicKeyP master_pub; - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_fixed_auto ("master_public_key", - &master_pub), - GNUNET_JSON_spec_array_const ("accounts", - &accounts), - GNUNET_JSON_spec_object_const ("fees", - &fees), - GNUNET_JSON_spec_array_const ("wads", - &wads), - GNUNET_JSON_spec_end () - }; - - wh->exchange->wire_error_count = 0; - if (GNUNET_OK != - GNUNET_JSON_parse (j, - spec, - NULL, NULL)) - { - /* bogus reply */ - GNUNET_break_op (0); - wr.hr.http_status = 0; - wr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; - break; - } - { - const struct TALER_EXCHANGE_Keys *key_state; - - key_state = TALER_EXCHANGE_get_keys (wh->exchange); - if (0 != GNUNET_memcmp (&key_state->master_pub, - &master_pub)) - { - /* bogus reply: master public key in /wire differs from that in /keys */ - GNUNET_break_op (0); - wr.hr.http_status = 0; - wr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; - break; - } - } - - wr.details.ok.accounts_len - = json_array_size (accounts); - if (0 == wr.details.ok.accounts_len) - { - /* bogus reply */ - GNUNET_break_op (0); - GNUNET_JSON_parse_free (spec); - wr.hr.http_status = 0; - wr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; - break; - } - fbm = parse_fees (&master_pub, - fees, - &wr.details.ok.fees_len); - wr.details.ok.fees = fbm; - if (NULL == fbm) - { - /* bogus reply */ - GNUNET_break_op (0); - GNUNET_JSON_parse_free (spec); - wr.hr.http_status = 0; - wr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; - break; - } - - /* parse accounts */ - { - struct TALER_EXCHANGE_WireAccount was[wr.details.ok.accounts_len]; - - wr.details.ok.accounts = was; - if (GNUNET_OK != - TALER_EXCHANGE_parse_accounts (&master_pub, - accounts, - was, - wr.details.ok.accounts_len)) - { - GNUNET_break_op (0); - wr.hr.http_status = 0; - wr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; - } - else if (NULL != wh->cb) - { - wh->cb (wh->cb_cls, - &wr); - wh->cb = NULL; - } - TALER_EXCHANGE_free_accounts (was, - wr.details.ok.accounts_len); - } /* end of 'parse accounts */ - free_fees (fbm, - wr.details.ok.fees_len); - GNUNET_JSON_parse_free (spec); - } /* end of MHD_HTTP_OK */ - 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 */ - wr.hr.ec = TALER_JSON_get_error_code (j); - wr.hr.hint = TALER_JSON_get_error_hint (j); - break; - case MHD_HTTP_NOT_FOUND: - /* Nothing really to verify, this should never - happen, we should pass the JSON reply to the application */ - wr.hr.ec = TALER_JSON_get_error_code (j); - wr.hr.hint = TALER_JSON_get_error_hint (j); - break; - case MHD_HTTP_INTERNAL_SERVER_ERROR: - /* Server had an internal issue; we should retry, but this API - leaves this to the application */ - wr.hr.ec = TALER_JSON_get_error_code (j); - wr.hr.hint = TALER_JSON_get_error_hint (j); - break; - default: - /* unexpected response code */ - if (MHD_HTTP_GATEWAY_TIMEOUT == response_code) - wh->exchange->wire_error_count++; - GNUNET_break_op (0); - wr.hr.ec = TALER_JSON_get_error_code (j); - wr.hr.hint = TALER_JSON_get_error_hint (j); - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Unexpected response code %u/%d for exchange wire\n", - (unsigned int) response_code, - (int) wr.hr.ec); - break; - } - if (NULL != wh->cb) - wh->cb (wh->cb_cls, - &wr); - TALER_EXCHANGE_wire_cancel (wh); -} - - -/** - * Compute the network timeout for the next request to /wire. - * - * @param exchange the exchange handle - * @returns the timeout in seconds (for use by CURL) - */ -static long -get_wire_timeout_seconds (struct TALER_EXCHANGE_Handle *exchange) -{ - return GNUNET_MIN (60, - 5 + (1L << exchange->wire_error_count)); -} - - -/** - * Obtain information about a exchange's wire instructions. - * A exchange may provide wire instructions for creating - * a reserve. The wire instructions also indicate - * which wire formats merchants may use with the exchange. - * This API is typically used by a wallet for wiring - * funds, and possibly by a merchant to determine - * supported wire formats. - * - * Note that while we return the (main) response verbatim to the - * caller for further processing, we do already verify that the - * response is well-formed (i.e. that signatures included in the - * response are all valid). If the exchange's reply is not well-formed, - * we return an HTTP status code of zero to @a cb. - * - * @param exchange the exchange handle; the exchange must be ready to operate - * @param wire_cb the callback to call when a reply for this request is available - * @param wire_cb_cls closure for the above callback - * @return a handle for this request - */ -struct TALER_EXCHANGE_WireHandle * -TALER_EXCHANGE_wire (struct TALER_EXCHANGE_Handle *exchange, - TALER_EXCHANGE_WireCallback wire_cb, - void *wire_cb_cls) -{ - struct TALER_EXCHANGE_WireHandle *wh; - struct GNUNET_CURL_Context *ctx; - CURL *eh; - - if (GNUNET_YES != - TEAH_handle_is_ready (exchange)) - { - GNUNET_break (0); - return NULL; - } - wh = GNUNET_new (struct TALER_EXCHANGE_WireHandle); - wh->exchange = exchange; - wh->cb = wire_cb; - wh->cb_cls = wire_cb_cls; - wh->url = TEAH_path_to_url (exchange, - "/wire"); - if (NULL == wh->url) - { - GNUNET_free (wh); - return NULL; - } - eh = TALER_EXCHANGE_curl_easy_get_ (wh->url); - if (NULL == eh) - { - GNUNET_break (0); - GNUNET_free (wh->url); - GNUNET_free (wh); - return NULL; - } - GNUNET_break (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_TIMEOUT, - get_wire_timeout_seconds (wh->exchange))); - ctx = TEAH_handle_to_context (exchange); - wh->job = GNUNET_CURL_job_add_with_ct_json (ctx, - eh, - &handle_wire_finished, - wh); - return wh; -} - - -/** - * Cancel a wire information request. This function cannot be used - * on a request handle if a response is already served for it. - * - * @param wh the wire information request handle - */ -void -TALER_EXCHANGE_wire_cancel (struct TALER_EXCHANGE_WireHandle *wh) -{ - if (NULL != wh->job) - { - GNUNET_CURL_job_cancel (wh->job); - wh->job = NULL; - } - GNUNET_free (wh->url); - GNUNET_free (wh); -} - - -/* end of exchange_api_wire.c */ |