LCOV - code coverage report
Current view: top level - lib - merchant_api_wallet_post_order_refund.c (source / functions) Hit Total Coverage
Test: GNU Taler merchant coverage report Lines: 0 139 0.0 %
Date: 2022-08-25 06:17:04 Functions: 0 4 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2020 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it under the
       6             :   terms of the GNU Lesser General Public License as published by the Free Software
       7             :   Foundation; either version 2.1, or (at your option) any later version.
       8             : 
       9             :   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
      10             :   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
      11             :   A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU Lesser General Public License along with
      14             :   TALER; see the file COPYING.LGPL.  If not, see
      15             :   <http://www.gnu.org/licenses/>
      16             : */
      17             : /**
      18             :  * @file merchant_api_wallet_post_order_refund.c
      19             :  * @brief Implementation of the (public) POST /orders/ID/refund request
      20             :  * @author Jonathan Buchanan
      21             :  */
      22             : #include "platform.h"
      23             : #include <curl/curl.h>
      24             : #include <jansson.h>
      25             : #include <microhttpd.h> /* just for HTTP status codes */
      26             : #include <gnunet/gnunet_util_lib.h>
      27             : #include <gnunet/gnunet_curl_lib.h>
      28             : #include "taler_merchant_service.h"
      29             : #include "merchant_api_curl_defaults.h"
      30             : #include <taler/taler_json_lib.h>
      31             : #include <taler/taler_signatures.h>
      32             : #include <taler/taler_curl_lib.h>
      33             : 
      34             : 
      35             : /**
      36             :  * Handle for a (public) POST /orders/ID/refund operation.
      37             :  */
      38             : struct TALER_MERCHANT_WalletOrderRefundHandle
      39             : {
      40             :   /**
      41             :    * Complete URL where the backend offers /refund
      42             :    */
      43             :   char *url;
      44             : 
      45             :   /**
      46             :    * Minor context that holds body and headers.
      47             :    */
      48             :   struct TALER_CURL_PostContext post_ctx;
      49             : 
      50             :   /**
      51             :    * The CURL context to connect to the backend
      52             :    */
      53             :   struct GNUNET_CURL_Context *ctx;
      54             : 
      55             :   /**
      56             :    * The callback to pass the backend response to
      57             :    */
      58             :   TALER_MERCHANT_WalletRefundCallback cb;
      59             : 
      60             :   /**
      61             :    * Clasure to pass to the callback
      62             :    */
      63             :   void *cb_cls;
      64             : 
      65             :   /**
      66             :    * Handle for the request
      67             :    */
      68             :   struct GNUNET_CURL_Job *job;
      69             : };
      70             : 
      71             : 
      72             : /**
      73             :  * Convenience function to call the callback in @a owgh with an error code of
      74             :  * @a ec and the exchange body being set to @a reply.
      75             :  *
      76             :  * @param orh handle providing callback
      77             :  * @param ec error code to return to application
      78             :  * @param reply JSON reply we got from the exchange, can be NULL
      79             :  */
      80             : static void
      81           0 : cb_failure (struct TALER_MERCHANT_WalletOrderRefundHandle *orh,
      82             :             enum TALER_ErrorCode ec,
      83             :             const json_t *reply)
      84             : {
      85           0 :   struct TALER_MERCHANT_HttpResponse hr = {
      86             :     .ec = ec,
      87             :     .reply = reply
      88             :   };
      89             : 
      90           0 :   orh->cb (orh->cb_cls,
      91             :            &hr,
      92             :            NULL,
      93             :            NULL,
      94             :            NULL,
      95             :            0);
      96           0 : }
      97             : 
      98             : 
      99             : /**
     100             :  * Callback to process (public) POST /orders/ID/refund response
     101             :  *
     102             :  * @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
     103             :  * @param response_code HTTP response code, 0 on error
     104             :  * @param response response body, NULL if not JSON
     105             :  */
     106             : static void
     107           0 : handle_refund_finished (void *cls,
     108             :                         long response_code,
     109             :                         const void *response)
     110             : {
     111           0 :   struct TALER_MERCHANT_WalletOrderRefundHandle *orh = cls;
     112           0 :   const json_t *json = response;
     113           0 :   struct TALER_MERCHANT_HttpResponse hr = {
     114           0 :     .http_status = (unsigned int) response_code,
     115             :     .reply = json
     116             :   };
     117             : 
     118           0 :   orh->job = NULL;
     119             : 
     120           0 :   switch (response_code)
     121             :   {
     122           0 :   case 0:
     123           0 :     hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     124           0 :     orh->cb (orh->cb_cls,
     125             :              &hr,
     126             :              NULL,
     127             :              NULL,
     128             :              NULL,
     129             :              0);
     130           0 :     break;
     131           0 :   case MHD_HTTP_OK:
     132             :     {
     133             :       struct TALER_Amount refund_amount;
     134             :       json_t *refunds;
     135             :       struct TALER_MerchantPublicKeyP merchant_pub;
     136             :       unsigned int refund_len;
     137             :       struct GNUNET_JSON_Specification spec[] = {
     138           0 :         TALER_JSON_spec_amount_any ("refund_amount",
     139             :                                     &refund_amount),
     140           0 :         GNUNET_JSON_spec_json ("refunds",
     141             :                                &refunds),
     142           0 :         GNUNET_JSON_spec_fixed_auto ("merchant_pub",
     143             :                                      &merchant_pub),
     144           0 :         GNUNET_JSON_spec_end ()
     145             :       };
     146             : 
     147           0 :       if (GNUNET_OK !=
     148           0 :           GNUNET_JSON_parse (json,
     149             :                              spec,
     150             :                              NULL, NULL))
     151             :       {
     152           0 :         GNUNET_break_op (0);
     153           0 :         cb_failure (orh,
     154             :                     TALER_EC_GENERIC_REPLY_MALFORMED,
     155             :                     json);
     156           0 :         TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
     157           0 :         return;
     158             :       }
     159             : 
     160           0 :       if (! json_is_array (refunds))
     161             :       {
     162           0 :         GNUNET_break_op (0);
     163           0 :         cb_failure (orh,
     164             :                     TALER_EC_GENERIC_REPLY_MALFORMED,
     165             :                     json);
     166           0 :         GNUNET_JSON_parse_free (spec);
     167           0 :         TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
     168           0 :         return;
     169             :       }
     170             : 
     171           0 :       refund_len = json_array_size (refunds);
     172           0 :       {
     173           0 :         struct TALER_MERCHANT_RefundDetail rds[refund_len];
     174             : 
     175           0 :         memset (rds,
     176             :                 0,
     177             :                 sizeof (rds));
     178           0 :         for (unsigned int i = 0; i<refund_len; i++)
     179             :         {
     180           0 :           struct TALER_MERCHANT_RefundDetail *rd = &rds[i];
     181           0 :           const json_t *jrefund = json_array_get (refunds,
     182             :                                                   i);
     183             :           const char *refund_status_type;
     184             :           uint32_t exchange_status;
     185             :           int ret;
     186             :           struct GNUNET_JSON_Specification espec[] = {
     187           0 :             GNUNET_JSON_spec_uint32 ("exchange_status",
     188             :                                      &exchange_status),
     189           0 :             GNUNET_JSON_spec_end ()
     190             :           };
     191             : 
     192           0 :           if (GNUNET_OK !=
     193           0 :               GNUNET_JSON_parse (jrefund,
     194             :                                  espec,
     195             :                                  NULL, NULL))
     196             :           {
     197           0 :             GNUNET_break_op (0);
     198           0 :             cb_failure (orh,
     199             :                         TALER_EC_GENERIC_REPLY_MALFORMED,
     200             :                         json);
     201           0 :             TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
     202           0 :             return;
     203             :           }
     204             : 
     205           0 :           if (MHD_HTTP_OK == exchange_status)
     206             :           {
     207             :             struct GNUNET_JSON_Specification rspec[] = {
     208           0 :               GNUNET_JSON_spec_string ("type",
     209             :                                        &refund_status_type),
     210           0 :               GNUNET_JSON_spec_fixed_auto ("exchange_sig",
     211             :                                            &rd->exchange_sig),
     212           0 :               GNUNET_JSON_spec_fixed_auto ("exchange_pub",
     213             :                                            &rd->exchange_pub),
     214           0 :               GNUNET_JSON_spec_uint64 ("rtransaction_id",
     215             :                                        &rd->rtransaction_id),
     216           0 :               GNUNET_JSON_spec_fixed_auto ("coin_pub",
     217             :                                            &rd->coin_pub),
     218           0 :               TALER_JSON_spec_amount_any ("refund_amount",
     219             :                                           &rd->refund_amount),
     220           0 :               GNUNET_JSON_spec_end ()
     221             :             };
     222             : 
     223           0 :             ret = GNUNET_JSON_parse (jrefund,
     224             :                                      rspec,
     225             :                                      NULL, NULL);
     226           0 :             if (GNUNET_OK == ret)
     227             :             {
     228             :               /* check that type field is correct */
     229           0 :               if (0 != strcmp ("success", refund_status_type))
     230             :               {
     231           0 :                 GNUNET_break_op (0);
     232           0 :                 ret = GNUNET_SYSERR;
     233             :               }
     234             :             }
     235             :           }
     236             :           else
     237             :           {
     238             :             struct GNUNET_JSON_Specification rspec[] = {
     239           0 :               GNUNET_JSON_spec_string ("type",
     240             :                                        &refund_status_type),
     241           0 :               GNUNET_JSON_spec_fixed_auto ("coin_pub",
     242             :                                            &rd->coin_pub),
     243           0 :               GNUNET_JSON_spec_uint64 ("rtransaction_id",
     244             :                                        &rd->rtransaction_id),
     245           0 :               TALER_JSON_spec_amount_any ("refund_amount",
     246             :                                           &rd->refund_amount),
     247           0 :               GNUNET_JSON_spec_end ()
     248             :             };
     249             : 
     250           0 :             ret = GNUNET_JSON_parse (jrefund,
     251             :                                      rspec,
     252             :                                      NULL, NULL);
     253           0 :             if (GNUNET_OK == ret)
     254             :             {
     255             :               /* parse optional arguments */
     256             :               json_t *jec;
     257             : 
     258           0 :               jec = json_object_get (jrefund,
     259             :                                      "exchange_code");
     260           0 :               if (NULL != jec)
     261             :               {
     262           0 :                 if (! json_is_integer (jec))
     263             :                 {
     264           0 :                   GNUNET_break_op (0);
     265           0 :                   ret = GNUNET_SYSERR;
     266             :                 }
     267             :                 else
     268             :                 {
     269           0 :                   rd->hr.ec = (enum TALER_ErrorCode) json_integer_value (jec);
     270             :                 }
     271             :               }
     272           0 :               rd->hr.reply = json_object_get (jrefund,
     273             :                                               "exchange_reply");
     274             :               /* check that type field is correct */
     275           0 :               if (0 != strcmp ("failure", refund_status_type))
     276             :               {
     277           0 :                 GNUNET_break_op (0);
     278           0 :                 ret = GNUNET_SYSERR;
     279             :               }
     280             :             }
     281             :           }
     282           0 :           if (GNUNET_OK != ret)
     283             :           {
     284           0 :             GNUNET_break_op (0);
     285           0 :             cb_failure (orh,
     286             :                         TALER_EC_GENERIC_REPLY_MALFORMED,
     287             :                         json);
     288           0 :             TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
     289           0 :             return;
     290             :           }
     291           0 :           rd->hr.http_status = exchange_status;
     292             :         }
     293             : 
     294             :         {
     295           0 :           struct TALER_MERCHANT_HttpResponse hr = {
     296             :             .reply = json,
     297             :             .http_status = MHD_HTTP_OK
     298             :           };
     299             : 
     300           0 :           orh->cb (orh->cb_cls,
     301             :                    &hr,
     302             :                    &refund_amount,
     303             :                    &merchant_pub,
     304             :                    rds,
     305             :                    refund_len);
     306             :         }
     307             :       }
     308           0 :       GNUNET_JSON_parse_free (spec);
     309             :     }
     310           0 :     break;
     311           0 :   case MHD_HTTP_NO_CONTENT:
     312           0 :     orh->cb (orh->cb_cls,
     313             :              &hr,
     314             :              NULL,
     315             :              NULL,
     316             :              NULL,
     317             :              0);
     318           0 :     break;
     319           0 :   case MHD_HTTP_CONFLICT:
     320             :   case MHD_HTTP_NOT_FOUND:
     321           0 :     hr.ec = TALER_JSON_get_error_code (json);
     322           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     323           0 :     orh->cb (orh->cb_cls,
     324             :              &hr,
     325             :              NULL,
     326             :              NULL,
     327             :              NULL,
     328             :              0);
     329           0 :     break;
     330           0 :   default:
     331           0 :     GNUNET_break_op (0); /* unexpected status code */
     332           0 :     TALER_MERCHANT_parse_error_details_ (json,
     333             :                                          response_code,
     334             :                                          &hr);
     335           0 :     orh->cb (orh->cb_cls,
     336             :              &hr,
     337             :              NULL,
     338             :              NULL,
     339             :              NULL,
     340             :              0);
     341           0 :     break;
     342             :   }
     343           0 :   TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
     344             : }
     345             : 
     346             : 
     347             : struct TALER_MERCHANT_WalletOrderRefundHandle *
     348           0 : TALER_MERCHANT_wallet_post_order_refund (
     349             :   struct GNUNET_CURL_Context *ctx,
     350             :   const char *backend_url,
     351             :   const char *order_id,
     352             :   const struct TALER_PrivateContractHashP *h_contract_terms,
     353             :   TALER_MERCHANT_WalletRefundCallback cb,
     354             :   void *cb_cls)
     355             : {
     356             :   struct TALER_MERCHANT_WalletOrderRefundHandle *orh;
     357             :   json_t *req;
     358             :   CURL *eh;
     359             : 
     360           0 :   orh = GNUNET_new (struct TALER_MERCHANT_WalletOrderRefundHandle);
     361           0 :   orh->ctx = ctx;
     362           0 :   orh->cb = cb;
     363           0 :   orh->cb_cls = cb_cls;
     364             :   {
     365             :     char *path;
     366             : 
     367           0 :     GNUNET_asprintf (&path,
     368             :                      "orders/%s/refund",
     369             :                      order_id);
     370           0 :     orh->url = TALER_url_join (backend_url,
     371             :                                path,
     372             :                                NULL);
     373           0 :     GNUNET_free (path);
     374             :   }
     375           0 :   if (NULL == orh->url)
     376             :   {
     377           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     378             :                 "Could not construct request URL.\n");
     379           0 :     GNUNET_free (orh);
     380           0 :     return NULL;
     381             :   }
     382           0 :   req = GNUNET_JSON_PACK (
     383             :     GNUNET_JSON_pack_data_auto ("h_contract",
     384             :                                 h_contract_terms));
     385           0 :   eh = TALER_MERCHANT_curl_easy_get_ (orh->url);
     386           0 :   if (GNUNET_OK !=
     387           0 :       TALER_curl_easy_post (&orh->post_ctx,
     388             :                             eh,
     389             :                             req))
     390             :   {
     391           0 :     GNUNET_break (0);
     392           0 :     json_decref (req);
     393           0 :     curl_easy_cleanup (eh);
     394           0 :     GNUNET_free (orh->url);
     395           0 :     GNUNET_free (orh);
     396           0 :     return NULL;
     397             :   }
     398           0 :   json_decref (req);
     399           0 :   orh->job = GNUNET_CURL_job_add2 (ctx,
     400             :                                    eh,
     401           0 :                                    orh->post_ctx.headers,
     402             :                                    &handle_refund_finished,
     403             :                                    orh);
     404           0 :   if (NULL == orh->job)
     405             :   {
     406           0 :     GNUNET_free (orh->url);
     407           0 :     GNUNET_free (orh);
     408           0 :     return NULL;
     409             :   }
     410           0 :   return orh;
     411             : }
     412             : 
     413             : 
     414             : void
     415           0 : TALER_MERCHANT_wallet_post_order_refund_cancel (
     416             :   struct TALER_MERCHANT_WalletOrderRefundHandle *orh)
     417             : {
     418           0 :   if (NULL != orh->job)
     419             :   {
     420           0 :     GNUNET_CURL_job_cancel (orh->job);
     421           0 :     orh->job = NULL;
     422             :   }
     423           0 :   TALER_curl_easy_post_finished (&orh->post_ctx);
     424           0 :   GNUNET_free (orh->url);
     425           0 :   GNUNET_free (orh);
     426           0 : }
     427             : 
     428             : 
     429             : /* end of merchant_api_wallet_post_order_refund.c */

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