LCOV - code coverage report
Current view: top level - lib - merchant_api_tip_authorize.c (source / functions) Hit Total Coverage
Test: GNU Taler merchant coverage report Lines: 0 125 0.0 %
Date: 2022-08-25 06:17:04 Functions: 0 5 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2014-2017, 2020, 2021 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_tip_authorize.c
      19             :  * @brief Implementation of the /tip-authorize request of the merchant's HTTP API
      20             :  * @author Marcello Stanisci
      21             :  * @author Christian Grothoff
      22             :  */
      23             : #include "platform.h"
      24             : #include <curl/curl.h>
      25             : #include <jansson.h>
      26             : #include <microhttpd.h> /* just for HTTP status codes */
      27             : #include <gnunet/gnunet_util_lib.h>
      28             : #include <gnunet/gnunet_curl_lib.h>
      29             : #include "taler_merchant_service.h"
      30             : #include "merchant_api_curl_defaults.h"
      31             : #include <taler/taler_json_lib.h>
      32             : #include <taler/taler_signatures.h>
      33             : #include <taler/taler_curl_lib.h>
      34             : 
      35             : 
      36             : /**
      37             :  * @brief A handle for tip authorizations.
      38             :  */
      39             : struct TALER_MERCHANT_TipAuthorizeHandle
      40             : {
      41             : 
      42             :   /**
      43             :    * The url for this request.
      44             :    */
      45             :   char *url;
      46             : 
      47             :   /**
      48             :    * Handle for the request.
      49             :    */
      50             :   struct GNUNET_CURL_Job *job;
      51             : 
      52             :   /**
      53             :    * Function to call with the result.
      54             :    */
      55             :   TALER_MERCHANT_TipAuthorizeCallback cb;
      56             : 
      57             :   /**
      58             :    * Closure for @a cb.
      59             :    */
      60             :   void *cb_cls;
      61             : 
      62             :   /**
      63             :    * Reference to the execution context.
      64             :    */
      65             :   struct GNUNET_CURL_Context *ctx;
      66             : 
      67             :   /**
      68             :    * Minor context that holds body and headers.
      69             :    */
      70             :   struct TALER_CURL_PostContext post_ctx;
      71             : };
      72             : 
      73             : 
      74             : /**
      75             :  * We got a 200 response back from the exchange (or the merchant).
      76             :  * Now we need to parse the response and if it is well-formed,
      77             :  * call the callback (and set it to NULL afterwards).
      78             :  *
      79             :  * @param tao handle of the original authorization operation
      80             :  * @param json cryptographic proof returned by the exchange/merchant
      81             :  * @return #GNUNET_OK if response is valid
      82             :  */
      83             : static int
      84           0 : check_ok (struct TALER_MERCHANT_TipAuthorizeHandle *tao,
      85             :           const json_t *json)
      86             : {
      87             :   const char *tip_status_url;
      88             :   const char *taler_tip_uri;
      89             :   struct TALER_TipIdentifierP tip_id;
      90             :   struct GNUNET_TIME_Timestamp expiration_time;
      91             :   struct GNUNET_JSON_Specification spec[] = {
      92           0 :     GNUNET_JSON_spec_string ("tip_status_url", &tip_status_url),
      93           0 :     GNUNET_JSON_spec_string ("taler_tip_uri", &taler_tip_uri),
      94           0 :     GNUNET_JSON_spec_timestamp ("tip_expiration", &expiration_time),
      95           0 :     GNUNET_JSON_spec_fixed_auto ("tip_id", &tip_id),
      96           0 :     GNUNET_JSON_spec_end ()
      97             :   };
      98           0 :   struct TALER_MERCHANT_HttpResponse hr = {
      99             :     .http_status = MHD_HTTP_OK,
     100             :     .reply = json
     101             :   };
     102             : 
     103           0 :   if (GNUNET_OK !=
     104           0 :       GNUNET_JSON_parse (json,
     105             :                          spec,
     106             :                          NULL, NULL))
     107             :   {
     108             :     char *log;
     109             : 
     110           0 :     GNUNET_break_op (0);
     111           0 :     log = json_dumps (json,
     112             :                       0);
     113           0 :     GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     114             :                 "JSON %s\n",
     115             :                 log);
     116           0 :     free (log);
     117           0 :     return GNUNET_SYSERR;
     118             :   }
     119           0 :   tao->cb (tao->cb_cls,
     120             :            &hr,
     121             :            &tip_id,
     122             :            taler_tip_uri,
     123             :            expiration_time);
     124           0 :   tao->cb = NULL; /* do not call twice */
     125           0 :   GNUNET_JSON_parse_free (spec);
     126           0 :   return GNUNET_OK;
     127             : }
     128             : 
     129             : 
     130             : /**
     131             :  * Function called when we're done processing the
     132             :  * HTTP /reservers/$TIP_ID/tip-authorize request.
     133             :  *
     134             :  * @param cls the `struct TALER_MERCHANT_TipAuthorizeHandle`
     135             :  * @param response_code HTTP response code, 0 on error
     136             :  * @param response response body, NULL if not in JSON
     137             :  */
     138             : static void
     139           0 : handle_tip_authorize_finished (void *cls,
     140             :                                long response_code,
     141             :                                const void *response)
     142             : {
     143           0 :   struct TALER_MERCHANT_TipAuthorizeHandle *tao = cls;
     144           0 :   const json_t *json = response;
     145           0 :   struct TALER_MERCHANT_HttpResponse hr = {
     146           0 :     .http_status = (unsigned int) response_code,
     147             :     .reply = json
     148             :   };
     149             : 
     150           0 :   tao->job = NULL;
     151           0 :   switch (response_code)
     152             :   {
     153           0 :   case MHD_HTTP_OK:
     154           0 :     if (GNUNET_OK ==
     155           0 :         check_ok (tao,
     156             :                   json))
     157             :     {
     158           0 :       TALER_MERCHANT_tip_authorize_cancel (tao);
     159           0 :       return;
     160             :     }
     161           0 :     GNUNET_break_op (0);
     162           0 :     hr.http_status = 0;
     163           0 :     hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     164           0 :     break;
     165           0 :   case MHD_HTTP_UNAUTHORIZED:
     166           0 :     hr.ec = TALER_JSON_get_error_code (json);
     167           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     168             :     /* Nothing really to verify, merchant says we need to authenticate. */
     169           0 :     break;
     170           0 :   case MHD_HTTP_NOT_FOUND:
     171             :     /* Well-defined status code, pass on to application! */
     172           0 :     hr.ec = TALER_JSON_get_error_code (json);
     173           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     174           0 :     break;
     175           0 :   case MHD_HTTP_PRECONDITION_FAILED:
     176             :     /* Well-defined status code, pass on to application! */
     177           0 :     hr.ec = TALER_JSON_get_error_code (json);
     178           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     179           0 :     break;
     180           0 :   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     181             :     /* Server had an internal issue; we should retry, but this API
     182             :        leaves this to the application */
     183           0 :     hr.ec = TALER_JSON_get_error_code (json);
     184           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     185           0 :     break;
     186           0 :   case MHD_HTTP_SERVICE_UNAVAILABLE:
     187             :     /* Server had an unclear (internal or external) issue; we should retry,
     188             :        but this API leaves this to the application */
     189           0 :     TALER_MERCHANT_parse_error_details_ (json,
     190             :                                          response_code,
     191             :                                          &hr);
     192           0 :     break;
     193           0 :   default:
     194             :     /* unexpected response code */
     195           0 :     GNUNET_break_op (0);
     196           0 :     TALER_MERCHANT_parse_error_details_ (json,
     197             :                                          response_code,
     198             :                                          &hr);
     199           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     200             :                 "Unexpected response code %u/%d\n",
     201             :                 (unsigned int) response_code,
     202             :                 (int) hr.ec);
     203           0 :     break;
     204             :   }
     205           0 :   if (NULL != tao->cb)
     206           0 :     tao->cb (tao->cb_cls,
     207             :              &hr,
     208             :              NULL,
     209             :              NULL,
     210           0 :              GNUNET_TIME_UNIT_ZERO_TS);
     211           0 :   TALER_MERCHANT_tip_authorize_cancel (tao);
     212             : }
     213             : 
     214             : 
     215             : struct TALER_MERCHANT_TipAuthorizeHandle *
     216           0 : TALER_MERCHANT_tip_authorize2 (
     217             :   struct GNUNET_CURL_Context *ctx,
     218             :   const char *backend_url,
     219             :   const struct TALER_ReservePublicKeyP *reserve_pub,
     220             :   const char *next_url,
     221             :   const struct TALER_Amount *amount,
     222             :   const char *justification,
     223             :   TALER_MERCHANT_TipAuthorizeCallback authorize_cb,
     224             :   void *authorize_cb_cls)
     225             : {
     226             :   struct TALER_MERCHANT_TipAuthorizeHandle *tao;
     227             :   CURL *eh;
     228             :   json_t *te_obj;
     229             : 
     230           0 :   tao = GNUNET_new (struct TALER_MERCHANT_TipAuthorizeHandle);
     231           0 :   tao->ctx = ctx;
     232           0 :   tao->cb = authorize_cb;
     233           0 :   tao->cb_cls = authorize_cb_cls;
     234             : 
     235             :   {
     236             :     char res_str[sizeof (*reserve_pub) * 2];
     237             :     char arg_str[sizeof (res_str) + 48];
     238             :     char *end;
     239             : 
     240           0 :     end = GNUNET_STRINGS_data_to_string (reserve_pub,
     241             :                                          sizeof (*reserve_pub),
     242             :                                          res_str,
     243             :                                          sizeof (res_str));
     244           0 :     *end = '\0';
     245           0 :     GNUNET_snprintf (arg_str,
     246             :                      sizeof (arg_str),
     247             :                      "private/reserves/%s/authorize-tip",
     248             :                      res_str);
     249           0 :     tao->url = TALER_url_join (backend_url,
     250             :                                arg_str,
     251             :                                NULL);
     252             :   }
     253           0 :   if (NULL == tao->url)
     254             :   {
     255           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     256             :                 "Could not construct request URL.\n");
     257           0 :     GNUNET_free (tao);
     258           0 :     return NULL;
     259             :   }
     260           0 :   te_obj = GNUNET_JSON_PACK (
     261             :     TALER_JSON_pack_amount ("amount",
     262             :                             amount),
     263             :     GNUNET_JSON_pack_string ("justification",
     264             :                              justification),
     265             :     GNUNET_JSON_pack_string ("next_url",
     266             :                              next_url));
     267           0 :   eh = curl_easy_init ();
     268           0 :   GNUNET_assert (NULL != eh);
     269           0 :   if (GNUNET_OK !=
     270           0 :       TALER_curl_easy_post (&tao->post_ctx,
     271             :                             eh,
     272             :                             te_obj))
     273             :   {
     274           0 :     GNUNET_break (0);
     275           0 :     curl_easy_cleanup (eh);
     276           0 :     json_decref (te_obj);
     277           0 :     GNUNET_free (tao->url);
     278           0 :     GNUNET_free (tao);
     279           0 :     return NULL;
     280             :   }
     281             : 
     282           0 :   json_decref (te_obj);
     283           0 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     284             :               "Requesting URL '%s'\n",
     285             :               tao->url);
     286           0 :   GNUNET_assert (CURLE_OK == curl_easy_setopt (eh,
     287             :                                                CURLOPT_URL,
     288             :                                                tao->url));
     289             : 
     290           0 :   tao->job = GNUNET_CURL_job_add2 (ctx,
     291             :                                    eh,
     292           0 :                                    tao->post_ctx.headers,
     293             :                                    &handle_tip_authorize_finished,
     294             :                                    tao);
     295           0 :   return tao;
     296             : }
     297             : 
     298             : 
     299             : struct TALER_MERCHANT_TipAuthorizeHandle *
     300           0 : TALER_MERCHANT_tip_authorize (struct GNUNET_CURL_Context *ctx,
     301             :                               const char *backend_url,
     302             :                               const char *next_url,
     303             :                               const struct TALER_Amount *amount,
     304             :                               const char *justification,
     305             :                               TALER_MERCHANT_TipAuthorizeCallback authorize_cb,
     306             :                               void *authorize_cb_cls)
     307             : {
     308             :   struct TALER_MERCHANT_TipAuthorizeHandle *tao;
     309             :   CURL *eh;
     310             :   json_t *te_obj;
     311             : 
     312           0 :   tao = GNUNET_new (struct TALER_MERCHANT_TipAuthorizeHandle);
     313           0 :   tao->ctx = ctx;
     314           0 :   tao->cb = authorize_cb;
     315           0 :   tao->cb_cls = authorize_cb_cls;
     316             : 
     317           0 :   tao->url = TALER_url_join (backend_url,
     318             :                              "private/tips",
     319             :                              NULL);
     320           0 :   if (NULL == tao->url)
     321             :   {
     322           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     323             :                 "Could not construct request URL.\n");
     324           0 :     GNUNET_free (tao);
     325           0 :     return NULL;
     326             :   }
     327           0 :   te_obj = GNUNET_JSON_PACK (
     328             :     TALER_JSON_pack_amount ("amount",
     329             :                             amount),
     330             :     GNUNET_JSON_pack_string ("justification",
     331             :                              justification),
     332             :     GNUNET_JSON_pack_string ("next_url",
     333             :                              next_url));
     334           0 :   eh = TALER_MERCHANT_curl_easy_get_ (tao->url);
     335           0 :   if (GNUNET_OK !=
     336           0 :       TALER_curl_easy_post (&tao->post_ctx,
     337             :                             eh,
     338             :                             te_obj))
     339             :   {
     340           0 :     GNUNET_break (0);
     341           0 :     curl_easy_cleanup (eh);
     342           0 :     json_decref (te_obj);
     343           0 :     GNUNET_free (tao->url);
     344           0 :     GNUNET_free (tao);
     345           0 :     return NULL;
     346             :   }
     347           0 :   json_decref (te_obj);
     348           0 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     349             :               "Requesting URL '%s'\n",
     350             :               tao->url);
     351           0 :   tao->job = GNUNET_CURL_job_add2 (ctx,
     352             :                                    eh,
     353           0 :                                    tao->post_ctx.headers,
     354             :                                    &handle_tip_authorize_finished,
     355             :                                    tao);
     356           0 :   return tao;
     357             : }
     358             : 
     359             : 
     360             : void
     361           0 : TALER_MERCHANT_tip_authorize_cancel (
     362             :   struct TALER_MERCHANT_TipAuthorizeHandle *tao)
     363             : {
     364           0 :   if (NULL != tao->job)
     365             :   {
     366           0 :     GNUNET_CURL_job_cancel (tao->job);
     367           0 :     tao->job = NULL;
     368             :   }
     369           0 :   TALER_curl_easy_post_finished (&tao->post_ctx);
     370           0 :   GNUNET_free (tao->url);
     371           0 :   GNUNET_free (tao);
     372           0 : }
     373             : 
     374             : 
     375             : /* end of merchant_api_tip_authorize.c */

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