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Diffstat (limited to 'src/lib/merchant_api_tip_query.c')
| -rw-r--r-- | src/lib/merchant_api_tip_query.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/lib/merchant_api_tip_query.c b/src/lib/merchant_api_tip_query.c new file mode 100644 index 00000000..b0b2c194 --- /dev/null +++ b/src/lib/merchant_api_tip_query.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 Lesser General Public License as published by the Free Software + Foundation; either version 2.1, 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License along with + TALER; see the file COPYING.LGPL. If not, see + <http://www.gnu.org/licenses/> +*/ +/** + * @file lib/merchant_api_tip_query.c + * @brief Implementation of the /tip-query request of the merchant's HTTP API + * @author Florian Dold + */ +#include "platform.h" +#include <curl/curl.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_merchant_service.h" +#include <taler/taler_json_lib.h> +#include <taler/taler_signatures.h> + + +/** + * @brief A handle for tracking /tip-pickup operations + */ +struct TALER_MERCHANT_TipQueryOperation +{ + /** + * The url for this request. + */ + char *url; + + /** + * JSON encoding of the request to POST. + */ + char *json_enc; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_TipQueryCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; + + /** + * Expected number of planchets. + */ + unsigned int num_planchets; +}; + + +/** + * We got a 200 response back from the exchange (or the merchant). + * Now we need to parse the response and if it is well-formed, + * call the callback (and set it to NULL afterwards). + * + * @param tqo handle of the original operation + * @param json cryptographic proof returned by the exchange/merchant + * @return #GNUNET_OK if response is valid + */ +static int +check_ok (struct TALER_MERCHANT_TipQueryOperation *tqo, + const json_t *json) +{ + struct GNUNET_TIME_Absolute reserve_expiration; + struct TALER_Amount amount_authorized; + struct TALER_Amount amount_available; + struct TALER_Amount amount_picked_up; + struct TALER_ReservePublicKeyP reserve_pub; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("reserve_pub", &reserve_pub), + GNUNET_JSON_spec_absolute_time ("reserve_expiration", &reserve_expiration), + TALER_JSON_spec_amount ("amount_authorized", &amount_authorized), + TALER_JSON_spec_amount ("amount_available", &amount_available), + TALER_JSON_spec_amount ("amount_picked_up", &amount_picked_up), + GNUNET_JSON_spec_end() + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + tqo->cb (tqo->cb_cls, + MHD_HTTP_OK, + TALER_JSON_get_error_code (json), + json, + reserve_expiration, + &reserve_pub, + &amount_authorized, + &amount_available, + &amount_picked_up); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP /track/transaction request. + * + * @param cls the `struct TALER_MERCHANT_TipQueryOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, NULL if not in JSON + */ +static void +handle_tip_query_finished (void *cls, + long response_code, + const json_t *json) +{ + struct TALER_MERCHANT_TipQueryOperation *tqo = cls; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got /tip-query response with status code %u\n", + (unsigned int) response_code); + + tqo->job = NULL; + switch (response_code) + { + case MHD_HTTP_OK: + if (GNUNET_OK != check_ok (tqo, + json)) + { + GNUNET_break_op (0); + response_code = 0; + } + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + break; + case MHD_HTTP_NOT_FOUND: + /* legal, can happen if instance or tip reserve is unknown */ + 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; + } + if (MHD_HTTP_OK != response_code) + tqo->cb (tqo->cb_cls, + response_code, + TALER_JSON_get_error_code (json), + json, + GNUNET_TIME_UNIT_ZERO_ABS, + NULL, + NULL, + NULL, + NULL); + TALER_MERCHANT_tip_query_cancel (tqo); +} + + +/** + * Issue a /tip-query request to the backend. Informs the backend + * that a customer wants to pick up a tip. + * + * @param ctx execution context + * @param backend_url base URL of the merchant backend + * @param instance instance to query + * @return handle for this operation, NULL upon errors + */ +struct TALER_MERCHANT_TipQueryOperation * +TALER_MERCHANT_tip_query (struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const char *instance, + TALER_MERCHANT_TipQueryCallback query_cb, + void *query_cb_cls) +{ + struct TALER_MERCHANT_TipQueryOperation *tqo; + CURL *eh; + + tqo = GNUNET_new (struct TALER_MERCHANT_TipQueryOperation); + tqo->ctx = ctx; + tqo->cb = query_cb; + tqo->cb_cls = query_cb_cls; + tqo->url = TALER_url_join (backend_url, "/tip-query", + "instance", instance, + NULL); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Requesting URL '%s'\n", + tqo->url); + eh = curl_easy_init (); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_URL, + tqo->url)); + tqo->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_YES, + &handle_tip_query_finished, + tqo); + return tqo; +} + + +/** + * Cancel a /tip-query request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param tqo handle to the operation being cancelled + */ +void +TALER_MERCHANT_tip_query_cancel (struct TALER_MERCHANT_TipQueryOperation *tqo) +{ + if (NULL != tqo->job) + { + GNUNET_CURL_job_cancel (tqo->job); + tqo->job = NULL; + } + GNUNET_free (tqo->url); + GNUNET_free (tqo); +} + +/* end of merchant_api_tip_query.c */ |