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Diffstat (limited to 'src/bank-lib/bank_api_config.c')
| -rw-r--r-- | src/bank-lib/bank_api_config.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/src/bank-lib/bank_api_config.c b/src/bank-lib/bank_api_config.c new file mode 100644 index 000000000..a84e4ff85 --- /dev/null +++ b/src/bank-lib/bank_api_config.c @@ -0,0 +1,255 @@ +/* + This file is part of TALER + Copyright (C) 2017--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 <http://www.gnu.org/licenses/> +*/ +/** + * @file bank-lib/bank_api_config.c + * @brief Implementation of the /config request + * @author Christian Grothoff + */ +#include "platform.h" +#include "bank_api_common.h" +#include <microhttpd.h> /* just for HTTP status codes */ +#include "taler_signatures.h" + +/** + * Protocol version we implement. + */ +#define BANK_PROTOCOL_CURRENT 0 + +/** + * How many revisions back are we compatible to. + */ +#define BANK_PROTOCOL_AGE 0 + + +/** + * @brief A /config Handle + */ +struct TALER_BANK_ConfigHandle +{ + + /** + * The url for this request. + */ + char *request_url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_BANK_ConfigCallback hcb; + + /** + * Closure for @a cb. + */ + void *hcb_cls; +}; + + +/** + * Parse configuration given in JSON format and invoke the callback on each item. + * + * @param ch handle to the account configuration request + * @param config JSON object with the configuration + * @return #GNUNET_OK if configuration was valid and @a rconfiguration and @a balance + * were set, + * #GNUNET_SYSERR if there was a protocol violation in @a configuration + */ +static int +parse_config (struct TALER_BANK_ConfigHandle *ch, + const json_t *config) +{ + struct TALER_BANK_Configuration cfg; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_string ("version", + &cfg.version), + GNUNET_JSON_spec_string ("currency", + &cfg.version), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (config, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + ch->hcb (ch->hcb_cls, + MHD_HTTP_OK, + TALER_EC_NONE, + &cfg); + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP /config request. + * + * @param cls the `struct TALER_BANK_ConfigHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_configuration_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_BANK_ConfigHandle *ch = cls; + enum TALER_ErrorCode ec; + const json_t *j = response; + + ch->job = NULL; + switch (response_code) + { + case 0: + ec = TALER_EC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + if (GNUNET_OK != + parse_config (ch, + j)) + { + GNUNET_break_op (0); + response_code = 0; + ec = TALER_EC_INVALID_RESPONSE; + break; + } + response_code = MHD_HTTP_NO_CONTENT; /* signal end of list */ + ec = TALER_EC_NONE; + break; + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the bank is buggy + (or API version conflict); just pass JSON reply to the application */ + GNUNET_break_op (0); + ec = TALER_JSON_get_error_code (j); + break; + case MHD_HTTP_UNAUTHORIZED: + /* Nothing really to verify, bank says the HTTP Authentication + failed. May happen if HTTP authentication is used and the + user supplied a wrong username/password combination. */ + ec = TALER_JSON_get_error_code (j); + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + ec = TALER_JSON_get_error_code (j); + break; + default: + /* unexpected response code */ + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u\n", + (unsigned int) response_code); + GNUNET_break_op (0); + ec = TALER_JSON_get_error_code (j); + response_code = 0; + break; + } + ch->hcb (ch->hcb_cls, + response_code, + ec, + NULL); + TALER_BANK_configuration_cancel (ch); +} + + +/** + * Request the configuration of the bank. + * + * @param ctx curl context for the event loop + * @param auth authentication data to use + * @param hres_cb the callback to call with the + * configuration + * @param hres_cb_cls closure for the above callback + * @return NULL if the inputs are invalid + */ +struct TALER_BANK_ConfigHandle * +TALER_BANK_configuration (struct GNUNET_CURL_Context *ctx, + const struct TALER_BANK_AuthenticationData *auth, + TALER_BANK_ConfigCallback hres_cb, + void *hres_cb_cls) +{ + struct TALER_BANK_ConfigHandle *ch; + CURL *eh; + + ch = GNUNET_new (struct TALER_BANK_ConfigHandle); + ch->hcb = hres_cb; + ch->hcb_cls = hres_cb_cls; + ch->request_url = TALER_url_join (auth->wire_gateway_url, + "config", + NULL); + if (NULL == ch->request_url) + { + GNUNET_free (ch); + GNUNET_break (0); + return NULL; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Requesting configuration at `%s'\n", + ch->request_url); + eh = curl_easy_init (); + if ( (GNUNET_OK != + TALER_BANK_setup_auth_ (eh, + auth)) || + (CURLE_OK != + curl_easy_setopt (eh, + CURLOPT_URL, + ch->request_url)) ) + { + GNUNET_break (0); + TALER_BANK_configuration_cancel (ch); + curl_easy_cleanup (eh); + return NULL; + } + ch->job = GNUNET_CURL_job_add2 (ctx, + eh, + NULL, + &handle_configuration_finished, + ch); + return ch; +} + + +/** + * Cancel a configuration request. This function cannot be + * used on a request handle if a response is already + * served for it. + * + * @param ch the configuration request handle + */ +void +TALER_BANK_configuration_cancel (struct TALER_BANK_ConfigHandle *ch) +{ + if (NULL != ch->job) + { + GNUNET_CURL_job_cancel (ch->job); + ch->job = NULL; + } + GNUNET_free (ch->request_url); + GNUNET_free (ch); +} + + +/* end of bank_api_config.c */ |