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Diffstat (limited to 'src/lib/merchant_api_post_orders.c')
| -rw-r--r-- | src/lib/merchant_api_post_orders.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/lib/merchant_api_post_orders.c b/src/lib/merchant_api_post_orders.c new file mode 100644 index 00000000..2e90f897 --- /dev/null +++ b/src/lib/merchant_api_post_orders.c @@ -0,0 +1,245 @@ +/* + This file is part of TALER + Copyright (C) 2014-2020 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_post_orders.c + * @brief Implementation of the POST /orders + * @author Christian Grothoff + * @author Marcello Stanisci + */ +#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> +#include <taler/taler_curl_lib.h> + + +/** + * @brief A POST /orders Handle + */ +struct TALER_MERCHANT_PostOrdersOperation +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_PostOrdersCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; + + /** + * Minor context that holds body and headers. + */ + struct TALER_CURL_PostContext post_ctx; +}; + + +/** + * Function called when we're done processing the + * HTTP POST /orders request. + * + * @param cls the `struct TALER_MERCHANT_PostOrdersOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, NULL if not JSON + */ +static void +handle_post_order_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_MERCHANT_PostOrdersOperation *po = cls; + const char *order_id = NULL; + const json_t *json = response; + struct TALER_MERCHANT_HttpResponse hr = { + .http_status = (unsigned int) response_code, + .reply = json + }; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_string ("order_id", + &order_id), + GNUNET_JSON_spec_end () + }; + + po->job = NULL; + switch (response_code) + { + case 0: + hr.ec = TALER_EC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + hr.http_status = 0; + hr.ec = TALER_EC_PROPOSAL_REPLY_MALFORMED; + } + break; + case MHD_HTTP_BAD_REQUEST: + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + /* This should never happen, either us or + the merchant is buggy (or API version conflict); + just pass JSON reply to the application */ + break; + case MHD_HTTP_CONFLICT: + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + break; + case MHD_HTTP_FORBIDDEN: + /* Nothing really to verify, merchant says one + of the signatures is invalid; as we checked them, + this should never happen, we should pass the JSON + reply to the application */ + hr.ec = TALER_JSON_get_error_code (json); + 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 */ + hr.ec = TALER_JSON_get_error_code (json); + 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 */ + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + break; + default: + /* unexpected response code */ + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d\n", + (unsigned int) response_code, + (int) hr.ec); + GNUNET_break_op (0); + break; + } + po->cb (po->cb_cls, + &hr, + order_id); + if (MHD_HTTP_OK == response_code) + GNUNET_JSON_parse_free (spec); + TALER_MERCHANT_orders_post_cancel (po); +} + + +/** + * POST an order to the backend and receives the related proposal. + * + * @param ctx execution context + * @param backend_url URL of the backend + * @param order basic information about this purchase, + * to be extended by the backend + * @param cb the callback to call when a reply + * for this request is available + * @param cb_cls closure for @a proposal_cb + * @return a handle for this request, NULL on error + */ +struct TALER_MERCHANT_PostOrdersOperation * +TALER_MERCHANT_orders_post (struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const json_t *order, + TALER_MERCHANT_PostOrdersCallback cb, + void *cb_cls) +{ + struct TALER_MERCHANT_PostOrdersOperation *po; + json_t *req; + CURL *eh; + + po = GNUNET_new (struct TALER_MERCHANT_PostOrdersOperation); + po->ctx = ctx; + po->cb = cb; + po->cb_cls = cb_cls; + po->url = TALER_url_join (backend_url, "orders", NULL); + req = json_pack ("{s:O}", + "order", (json_t *) order); + eh = curl_easy_init (); + if (GNUNET_OK != TALER_curl_easy_post (&po->post_ctx, + eh, + req)) + { + GNUNET_break (0); + json_decref (req); + GNUNET_free (po); + return NULL; + } + json_decref (req); + + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_URL, + po->url)); + po->job = GNUNET_CURL_job_add2 (ctx, + eh, + po->post_ctx.headers, + &handle_post_order_finished, + po); + return po; +} + + +/** + * Cancel a POST /proposal request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param po the proposal operation request handle + */ +void +TALER_MERCHANT_orders_post_cancel ( + struct TALER_MERCHANT_PostOrdersOperation *po) +{ + if (NULL != po->job) + { + GNUNET_CURL_job_cancel (po->job); + po->job = NULL; + } + GNUNET_free (po->url); + TALER_curl_easy_post_finished (&po->post_ctx); + GNUNET_free (po); +} + + +/* end of merchant_api_post_orders.c */ |