diff options
Diffstat (limited to 'src/lib/auditor_api_exchanges.c')
| -rw-r--r-- | src/lib/auditor_api_exchanges.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/lib/auditor_api_exchanges.c b/src/lib/auditor_api_exchanges.c new file mode 100644 index 000000000..897dfe60f --- /dev/null +++ b/src/lib/auditor_api_exchanges.c @@ -0,0 +1,244 @@ +/* + This file is part of TALER + Copyright (C) 2014-2018 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/auditor_api_exchanges.c + * @brief Implementation of the /exchanges request of the auditor'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_json_lib.h> +#include <gnunet/gnunet_curl_lib.h> +#include "taler_json_lib.h" +#include "taler_auditor_service.h" +#include "taler_util.h" +#include "taler_curl_lib.h" +#include "taler_signatures.h" +#include "auditor_api_curl_defaults.h" + +/** + * How many exchanges do we allow a single auditor to + * audit at most? + */ +#define MAX_EXCHANGES 1024 + + +/** + * @brief A ListExchanges Handle + */ +struct TALER_AUDITOR_ListExchangesHandle +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_AUDITOR_ListExchangesResultCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + +}; + + +/** + * Function called when we're done processing the + * HTTP /exchanges request. + * + * @param cls the `struct TALER_AUDITOR_ListExchangesHandle` + * @param response_code HTTP response code, 0 on error + * @param djson parsed JSON result, NULL on error + */ +static void +handle_exchanges_finished (void *cls, + long response_code, + const void *djson) +{ + const json_t *json = djson; + const json_t *ja; + unsigned int ja_len; + struct TALER_AUDITOR_ListExchangesHandle *leh = cls; + struct TALER_AUDITOR_ListExchangesResponse ler = { + .hr.reply = json, + .hr.http_status = (unsigned int) response_code + }; + + leh->job = NULL; + switch (response_code) + { + case 0: + ler.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + ja = json_object_get (json, + "exchanges"); + if ( (NULL == ja) || + (! json_is_array (ja)) ) + { + GNUNET_break (0); + ler.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + ler.hr.http_status = 0; + break; + } + + ja_len = json_array_size (ja); + if (ja_len > MAX_EXCHANGES) + { + GNUNET_break (0); + ler.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + ler.hr.http_status = 0; + break; + } + { + struct TALER_AUDITOR_ExchangeInfo ei[GNUNET_NZL (ja_len)]; + bool ok = true; + + for (unsigned int i = 0; i<ja_len; i++) + { + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("master_pub", + &ei[i].master_pub), + GNUNET_JSON_spec_string ("exchange_url", + &ei[i].exchange_url), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json_array_get (ja, + i), + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + ok = false; + ler.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + ler.hr.http_status = 0; + break; + } + } + if (! ok) + break; + ler.details.ok.ei = ei; + ler.details.ok.num_exchanges = ja_len; + leh->cb (leh->cb_cls, + &ler); + TALER_AUDITOR_list_exchanges_cancel (leh); + return; + } + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the auditor is buggy + (or API version conflict); just pass JSON reply to the application */ + ler.hr.ec = TALER_JSON_get_error_code (json); + ler.hr.hint = TALER_JSON_get_error_hint (json); + break; + case MHD_HTTP_NOT_FOUND: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + ler.hr.ec = TALER_JSON_get_error_code (json); + ler.hr.hint = TALER_JSON_get_error_hint (json); + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + ler.hr.ec = TALER_JSON_get_error_code (json); + ler.hr.hint = TALER_JSON_get_error_hint (json); + break; + default: + /* unexpected response code */ + ler.hr.ec = TALER_JSON_get_error_code (json); + ler.hr.hint = TALER_JSON_get_error_hint (json); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for auditor list-exchanges request\n", + (unsigned int) response_code, + (int) ler.hr.ec); + GNUNET_break_op (0); + break; + } + if (NULL != leh->cb) + leh->cb (leh->cb_cls, + &ler); + TALER_AUDITOR_list_exchanges_cancel (leh); +} + + +struct TALER_AUDITOR_ListExchangesHandle * +TALER_AUDITOR_list_exchanges (struct GNUNET_CURL_Context *ctx, + const char *url, + TALER_AUDITOR_ListExchangesResultCallback cb, + void *cb_cls) +{ + struct TALER_AUDITOR_ListExchangesHandle *leh; + CURL *eh; + + leh = GNUNET_new (struct TALER_AUDITOR_ListExchangesHandle); + leh->cb = cb; + leh->cb_cls = cb_cls; + leh->url = TALER_url_join (url, + "exchanges", + NULL); + if (NULL == leh->url) + { + GNUNET_free (leh); + return NULL; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "URL for list-exchanges: `%s'\n", + leh->url); + eh = TALER_AUDITOR_curl_easy_get_ (leh->url); + if (NULL == eh) + { + GNUNET_break (0); + GNUNET_free (leh->url); + GNUNET_free (leh); + return NULL; + } + leh->job = GNUNET_CURL_job_add (ctx, + eh, + &handle_exchanges_finished, + leh); + return leh; +} + + +void +TALER_AUDITOR_list_exchanges_cancel ( + struct TALER_AUDITOR_ListExchangesHandle *leh) +{ + if (NULL != leh->job) + { + GNUNET_CURL_job_cancel (leh->job); + leh->job = NULL; + } + GNUNET_free (leh->url); + GNUNET_free (leh); +} + + +/* end of auditor_api_exchanges.c */ |