merchant

merchant_api_post_order_refund.c (6881B)

---

 /*
   This file is part of TALER
   Copyright (C) 2014-2023 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 merchant_api_post_order_refund.c
  * @brief Implementation of the POST /orders/ID/refund request
  * @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 "merchant_api_curl_defaults.h"
 #include "merchant_api_common.h"
 #include <taler/taler_json_lib.h>
 #include <taler/taler_signatures.h>
 #include <taler/taler_curl_lib.h>
 
 
 /**
  * Handle for a POST /orders/ID/refund operation.
  */
 struct TALER_MERCHANT_OrderRefundHandle
 {
   /**
    * Complete URL where the backend offers /refund
    */
   char *url;
 
   /**
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
 
   /**
    * The CURL context to connect to the backend
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * The callback to pass the backend response to
    */
   TALER_MERCHANT_RefundCallback cb;
 
   /**
    * Clasure to pass to the callback
    */
   void *cb_cls;
 
   /**
    * Handle for the request
    */
   struct GNUNET_CURL_Job *job;
 };
 
 
 /**
  * Callback to process POST /orders/ID/refund response
  *
  * @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not JSON
  */
 static void
 handle_refund_finished (void *cls,
                         long response_code,
                         const void *response)
 {
   struct TALER_MERCHANT_OrderRefundHandle *orh = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_RefundResponse rr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   orh->job = NULL;
   switch (response_code)
   {
   case 0:
     rr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_OK:
     {
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_string (
           "taler_refund_uri",
           &rr.details.ok.taler_refund_uri),
         GNUNET_JSON_spec_fixed_auto (
           "h_contract",
           &rr.details.ok.h_contract),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (json,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         rr.hr.http_status = 0;
         rr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
         break;
       }
       break;
     }
   case MHD_HTTP_UNAUTHORIZED:
     rr.hr.ec = TALER_JSON_get_error_code (json);
     rr.hr.hint = TALER_JSON_get_error_hint (json);
     /* Nothing really to verify, merchant says we need to authenticate. */
     break;
   case MHD_HTTP_FORBIDDEN:
     rr.hr.ec = TALER_JSON_get_error_code (json);
     rr.hr.hint = TALER_JSON_get_error_hint (json);
     /* Nothing really to verify, merchant says we need to authenticate. */
     break;
   case MHD_HTTP_NOT_FOUND:
     /* order unknown (or not paid) */
     rr.hr.ec = TALER_JSON_get_error_code (json);
     rr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_CONFLICT:
     /* amount not acceptable */
     rr.hr.ec = TALER_JSON_get_error_code (json);
     rr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_GONE:
     /* too late, wire deadline is past */
     rr.hr.ec = TALER_JSON_get_error_code (json);
     rr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     GNUNET_break_op (0); /* unexpected status code */
     TALER_MERCHANT_parse_error_details_ (json,
                                          response_code,
                                          &rr.hr);
     break;
   }
   orh->cb (orh->cb_cls,
            &rr);
   TALER_MERCHANT_post_order_refund_cancel (orh);
 }
 
 
 void
 TALER_MERCHANT_post_order_refund_cancel (
   struct TALER_MERCHANT_OrderRefundHandle *orh)
 {
   if (NULL != orh->job)
   {
     GNUNET_CURL_job_cancel (orh->job);
     orh->job = NULL;
   }
   TALER_curl_easy_post_finished (&orh->post_ctx);
   GNUNET_free (orh->url);
   GNUNET_free (orh);
 }
 
 
 struct TALER_MERCHANT_OrderRefundHandle *
 TALER_MERCHANT_post_order_refund (struct GNUNET_CURL_Context *ctx,
                                   const char *backend_url,
                                   const char *order_id,
                                   const struct TALER_Amount *refund,
                                   const char *reason,
                                   TALER_MERCHANT_RefundCallback cb,
                                   void *cb_cls)
 {
   struct TALER_MERCHANT_OrderRefundHandle *orh;
   json_t *req;
   CURL *eh;
 
   orh = GNUNET_new (struct TALER_MERCHANT_OrderRefundHandle);
   orh->ctx = ctx;
   orh->cb = cb;
   orh->cb_cls = cb_cls;
   {
     char *path;
 
     GNUNET_asprintf (&path,
                      "private/orders/%s/refund",
                      order_id);
     orh->url = TALER_url_join (backend_url,
                                path,
                                NULL);
     GNUNET_free (path);
   }
   if (NULL == orh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (orh);
     return NULL;
   }
   req = GNUNET_JSON_PACK (
     TALER_JSON_pack_amount ("refund",
                             refund),
     GNUNET_JSON_pack_string ("reason",
                              reason));
   GNUNET_assert (NULL != req);
   eh = TALER_MERCHANT_curl_easy_get_ (orh->url);
   if (GNUNET_OK !=
       TALER_curl_easy_post (&orh->post_ctx,
                             eh,
                             req))
   {
     GNUNET_break (0);
     curl_easy_cleanup (eh);
     json_decref (req);
     GNUNET_free (orh->url);
     GNUNET_free (orh);
     return NULL;
   }
   json_decref (req);
   orh->job = GNUNET_CURL_job_add2 (ctx,
                                    eh,
                                    orh->post_ctx.headers,
                                    &handle_refund_finished,
                                    orh);
   if (NULL == orh->job)
   {
     GNUNET_free (orh->url);
     GNUNET_free (orh);
     return NULL;
   }
   return orh;
 }
 
 
 /* end of merchant_api_post_order_refund.c */