diff options
| -rw-r--r-- | src/lib/Makefile.am | 1 | ||||
| -rw-r--r-- | src/lib/exchange_api_reserves_get_attestable.c | 290 |
2 files changed, 291 insertions, 0 deletions
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am index 73ae3003d..df02dc097 100644 --- a/src/lib/Makefile.am +++ b/src/lib/Makefile.am @@ -62,6 +62,7 @@ libtalerexchange_la_SOURCES = \ exchange_api_refund.c \ exchange_api_reserves_close.c \ exchange_api_reserves_get.c \ + exchange_api_reserves_get_attestable.c \ exchange_api_reserves_history.c \ exchange_api_reserves_open.c \ exchange_api_reserves_status.c \ diff --git a/src/lib/exchange_api_reserves_get_attestable.c b/src/lib/exchange_api_reserves_get_attestable.c new file mode 100644 index 000000000..401418cd4 --- /dev/null +++ b/src/lib/exchange_api_reserves_get_attestable.c @@ -0,0 +1,290 @@ +/* + This file is part of TALER + Copyright (C) 2014-2022 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_reserves_get_attestable.c + * @brief Implementation of the GET_ATTESTABLE /reserves/$RESERVE_PUB requests + * @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_json_lib.h> +#include <gnunet/gnunet_curl_lib.h> +#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 /reserves/ GET_ATTESTABLE Handle + */ +struct TALER_EXCHANGE_ReservesGetAttestHandle +{ + + /** + * 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_ReservesGetAttestCallback cb; + + /** + * Public key of the reserve we are querying. + */ + struct TALER_ReservePublicKeyP reserve_pub; + + /** + * Closure for @a cb. + */ + void *cb_cls; + +}; + + +/** + * We received an #MHD_HTTP_OK status code. Handle the JSON + * response. + * + * @param rgah handle of the request + * @param j JSON response + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_reserves_get_attestable_ok ( + struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah, + const json_t *j) +{ + struct TALER_EXCHANGE_ReserveGetAttestResult rs = { + .hr.reply = j, + .hr.http_status = MHD_HTTP_OK + }; + json_t *details; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_json ("details", + &details), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + { + unsigned int dlen = json_array_size (details); + const char *attributes[GNUNET_NZL (dlen)]; + + for (unsigned int i = 0; i<dlen; i++) + { + json_t *detail = json_array_get (details, + i); + attributes[i] = json_string_value (detail); + if (NULL == attributes[i]) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + } + rs.details.ok.attributes_length = dlen; + rs.details.ok.attributes = attributes; + rgah->cb (rgah->cb_cls, + &rs); + rgah->cb = NULL; + } + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP GET /reserves/$RID/attest request. + * + * @param cls the `struct TALER_EXCHANGE_ReservesGetAttestableHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_reserves_get_attestable_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah = cls; + const json_t *j = response; + struct TALER_EXCHANGE_ReserveGetAttestResult rs = { + .hr.reply = j, + .hr.http_status = (unsigned int) response_code + }; + + rgah->job = NULL; + switch (response_code) + { + case 0: + rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + if (GNUNET_OK != + handle_reserves_get_attestable_ok (rgah, + j)) + { + rs.hr.http_status = 0; + rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + } + 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 */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.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 */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_CONFLICT: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.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 */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + default: + /* unexpected response code */ + GNUNET_break_op (0); + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for reserves get_attestable\n", + (unsigned int) response_code, + (int) rs.hr.ec); + break; + } + if (NULL != rgah->cb) + { + rgah->cb (rgah->cb_cls, + &rs); + rgah->cb = NULL; + } + TALER_EXCHANGE_reserves_get_attestable_cancel (rgah); +} + + +struct TALER_EXCHANGE_ReservesGetAttestHandle * +TALER_EXCHANGE_reserves_get_attestable ( + struct TALER_EXCHANGE_Handle *exchange, + const struct TALER_ReservePublicKeyP *reserve_pub, + TALER_EXCHANGE_ReservesGetAttestCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah; + struct GNUNET_CURL_Context *ctx; + CURL *eh; + char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32]; + + if (GNUNET_YES != + TEAH_handle_is_ready (exchange)) + { + GNUNET_break (0); + return NULL; + } + { + char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + reserve_pub, + sizeof (*reserve_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/reserves/%s/attest", + pub_str); + } + rgah = GNUNET_new (struct TALER_EXCHANGE_ReservesGetAttestHandle); + rgah->exchange = exchange; + rgah->cb = cb; + rgah->cb_cls = cb_cls; + rgah->reserve_pub = *reserve_pub; + rgah->url = TEAH_path_to_url (exchange, + arg_str); + if (NULL == rgah->url) + { + GNUNET_free (rgah); + return NULL; + } + eh = TALER_EXCHANGE_curl_easy_get_ (rgah->url); + if (NULL == eh) + { + GNUNET_break (0); + GNUNET_free (rgah->url); + GNUNET_free (rgah); + return NULL; + } + ctx = TEAH_handle_to_context (exchange); + rgah->job = GNUNET_CURL_job_add (ctx, + eh, + &handle_reserves_get_attestable_finished, + rgah); + return rgah; +} + + +void +TALER_EXCHANGE_reserves_get_attestable_cancel ( + struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah) +{ + if (NULL != rgah->job) + { + GNUNET_CURL_job_cancel (rgah->job); + rgah->job = NULL; + } + GNUNET_free (rgah->url); + GNUNET_free (rgah); +} + + +/* end of exchange_api_reserves_get_attestable.c */ |