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Diffstat (limited to 'src/lib/merchant_api_check_payment.c')
| -rw-r--r-- | src/lib/merchant_api_check_payment.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/lib/merchant_api_check_payment.c b/src/lib/merchant_api_check_payment.c new file mode 100644 index 00000000..0b5b3148 --- /dev/null +++ b/src/lib/merchant_api_check_payment.c @@ -0,0 +1,259 @@ +/* + This file is part of TALER + Copyright (C) 2018 GNUnet e.V. and INRIA + + 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_check_payment.c + * @brief Implementation of the /check-payment GET request + * @author Christian Grothoff + * @author Marcello Stanisci + * @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> +#include "merchant_api_common.h" + + +/** + * @brief A check payment operation handle + */ +struct TALER_MERCHANT_CheckPaymentOperation +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_CheckPaymentCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; +}; + + +/** + * Function called when we're done processing the GET /check-payment request. + * + * @param cls the `struct TALER_MERCHANT_CheckPaymentOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, should be NULL + */ +static void +handle_check_payment_finished (void *cls, + long response_code, + const json_t *json) +{ + struct TALER_MERCHANT_CheckPaymentOperation *cpo = cls; + struct TALER_Amount refund_amount = { 0 }; + int refunded; + + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_boolean ("refunded", + &refunded), + TALER_JSON_spec_amount ("refund_amount", + &refund_amount), + GNUNET_JSON_spec_end() + }; + + cpo->job = NULL; + + if (MHD_HTTP_OK != response_code) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Checking payment failed with HTTP status code %u\n", + (unsigned int) response_code); + GNUNET_break_op (0); + cpo->cb (cpo->cb_cls, + response_code, + json, + GNUNET_SYSERR, + GNUNET_SYSERR, + &refund_amount, + NULL); + TALER_MERCHANT_check_payment_cancel (cpo); + return; + } + + if (! json_boolean_value (json_object_get (json, "paid"))) + { + const char *payment_redirect_url = json_string_value (json_object_get (json, "payment_redirect_url")); + if (NULL == payment_redirect_url) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "no payment_redirect_url in unpaid check-payment response\n"); + GNUNET_break_op (0); + cpo->cb (cpo->cb_cls, + 0, + json, + GNUNET_SYSERR, + GNUNET_SYSERR, + &refund_amount, + NULL); + } else { + cpo->cb (cpo->cb_cls, + response_code, + json, + GNUNET_NO, + GNUNET_NO, + &refund_amount, + payment_redirect_url); + } + TALER_MERCHANT_check_payment_cancel (cpo); + return; + } + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "check payment failed to parse JSON\n"); + GNUNET_break_op (0); + cpo->cb (cpo->cb_cls, + 0, + json, + GNUNET_SYSERR, + GNUNET_SYSERR, + &refund_amount, + NULL); + TALER_MERCHANT_check_payment_cancel (cpo); + return; + } + + cpo->cb (cpo->cb_cls, + MHD_HTTP_OK, + json, + GNUNET_YES, + refunded, + &refund_amount, + NULL); + GNUNET_JSON_parse_free (spec); + TALER_MERCHANT_check_payment_cancel (cpo); +} + + +/** + * Issue a /check-payment request to the backend. Checks the status + * of a payment. + * + * @param ctx execution context + * @param backend_url base URL of the merchant backend + * @param instance instance used for the transaction + * @param order_id order id to identify the payment + * @parem resource_url resource URL to identify duplicate payments (can be NULL) + * @parem session_id sesion id for the payment (or NULL if the payment is not bound to a session) + * @parem session_id sesion signature for the payment (or NULL if the payment + * is not bound to a session or the session is not signed yet) + * @param check_payment_cb callback which will work the response gotten from the backend + * @param check_payment_cb_cls closure to pass to @a check_payment_cb + * @return handle for this operation, NULL upon errors + */ +struct TALER_MERCHANT_CheckPaymentOperation * +TALER_MERCHANT_check_payment (struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const char *instance, + const char *order_id, + const char *resource_url, + const char *session_id, + const char *session_sig, + TALER_MERCHANT_CheckPaymentCallback check_payment_cb, + void *check_payment_cb_cls) +{ + struct TALER_MERCHANT_CheckPaymentOperation *cpo; + CURL *eh; + + GNUNET_assert (NULL != backend_url); + GNUNET_assert (NULL != instance); + GNUNET_assert (NULL != order_id); + + cpo = GNUNET_new (struct TALER_MERCHANT_CheckPaymentOperation); + cpo->ctx = ctx; + cpo->cb = check_payment_cb; + cpo->cb_cls = check_payment_cb_cls; + cpo->url = MAH_make_url (backend_url, "/check-payment", + "instance", instance, + "order_id", order_id, + "resource_url", resource_url, + "session_id", session_id, + "session_sig", session_sig, + NULL); + eh = curl_easy_init (); + if (CURLE_OK != curl_easy_setopt (eh, + CURLOPT_URL, + cpo->url)) + { + GNUNET_break (0); + return NULL; + } + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "checking payment from %s\n", + cpo->url); + + if (NULL == (cpo->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_YES, + &handle_check_payment_finished, + cpo))) + { + GNUNET_break (0); + return NULL; + } + return cpo; +} + + +/** + * Cancel a GET /check-payment request. + * + * @param cph handle to the request to be canceled + */ +void +TALER_MERCHANT_check_payment_cancel (struct TALER_MERCHANT_CheckPaymentOperation *cph) +{ + if (NULL != cph->job) + { + GNUNET_CURL_job_cancel (cph->job); + cph->job = NULL; + } + GNUNET_free (cph->url); + GNUNET_free (cph); +} + +/* end of merchant_api_check_payment.c */ |