LCOV - code coverage report
Current view: top level - lib - merchant_api_get_config.c (source / functions) Hit Total Coverage
Test: GNU Taler merchant coverage report Lines: 0 60 0.0 %
Date: 2022-08-25 06:17:04 Functions: 0 3 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2014-2018, 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_get_config.c
      19             :  * @brief Implementation of the /config request of the merchant's HTTP API
      20             :  * @author Christian Grothoff
      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             : 
      33             : /**
      34             :  * Which version of the Taler protocol is implemented
      35             :  * by this library?  Used to determine compatibility.
      36             :  */
      37             : #define MERCHANT_PROTOCOL_CURRENT 3
      38             : 
      39             : /**
      40             :  * How many configs are we backwards compatible with?
      41             :  */
      42             : #define MERCHANT_PROTOCOL_AGE 1
      43             : 
      44             : 
      45             : /**
      46             :  * @brief A handle for /config operations
      47             :  */
      48             : struct TALER_MERCHANT_ConfigGetHandle
      49             : {
      50             :   /**
      51             :    * The url for this request.
      52             :    */
      53             :   char *url;
      54             : 
      55             :   /**
      56             :    * Handle for the request.
      57             :    */
      58             :   struct GNUNET_CURL_Job *job;
      59             : 
      60             :   /**
      61             :    * Function to call with the result.
      62             :    */
      63             :   TALER_MERCHANT_ConfigCallback cb;
      64             : 
      65             :   /**
      66             :    * Closure for @a cb.
      67             :    */
      68             :   void *cb_cls;
      69             : 
      70             :   /**
      71             :    * Reference to the execution context.
      72             :    */
      73             :   struct GNUNET_CURL_Context *ctx;
      74             : 
      75             : };
      76             : 
      77             : 
      78             : /**
      79             :  * Function called when we're done processing the
      80             :  * HTTP /config request.
      81             :  *
      82             :  * @param cls the `struct TALER_MERCHANT_ConfigGetHandle`
      83             :  * @param response_code HTTP response code, 0 on error
      84             :  * @param response response body, NULL if not in JSON
      85             :  */
      86             : static void
      87           0 : handle_config_finished (void *cls,
      88             :                         long response_code,
      89             :                         const void *response)
      90             : {
      91           0 :   struct TALER_MERCHANT_ConfigGetHandle *vgh = cls;
      92           0 :   const json_t *json = response;
      93           0 :   struct TALER_MERCHANT_HttpResponse hr = {
      94           0 :     .http_status = (unsigned int) response_code,
      95             :     .reply = json
      96             :   };
      97             : 
      98           0 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
      99             :               "Got /config response with status code %u\n",
     100             :               (unsigned int) response_code);
     101             : 
     102           0 :   vgh->job = NULL;
     103           0 :   switch (response_code)
     104             :   {
     105           0 :   case MHD_HTTP_OK:
     106             :     {
     107             :       struct TALER_MERCHANT_ConfigInformation vi;
     108           0 :       enum TALER_MERCHANT_VersionCompatibility vc =
     109             :         TALER_MERCHANT_VC_PROTOCOL_ERROR;
     110             :       struct GNUNET_JSON_Specification spec[] = {
     111           0 :         GNUNET_JSON_spec_string ("currency",
     112             :                                  &vi.currency),
     113           0 :         GNUNET_JSON_spec_string ("version",
     114             :                                  &vi.version),
     115           0 :         GNUNET_JSON_spec_end ()
     116             :       };
     117             : 
     118           0 :       if (GNUNET_OK !=
     119           0 :           GNUNET_JSON_parse (json,
     120             :                              spec,
     121             :                              NULL, NULL))
     122             :       {
     123           0 :         hr.http_status = 0;
     124           0 :         hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     125             :       }
     126             :       else
     127             :       {
     128             :         unsigned int age;
     129             :         unsigned int revision;
     130             :         unsigned int current;
     131             : 
     132           0 :         if (3 != sscanf (vi.version,
     133             :                          "%u:%u:%u",
     134             :                          &current,
     135             :                          &revision,
     136             :                          &age))
     137             :         {
     138           0 :           hr.http_status = 0;
     139           0 :           hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     140             :         }
     141             :         else
     142             :         {
     143           0 :           vc = TALER_MERCHANT_VC_MATCH;
     144           0 :           if (MERCHANT_PROTOCOL_CURRENT < current)
     145             :           {
     146           0 :             vc |= TALER_MERCHANT_VC_NEWER;
     147           0 :             if (MERCHANT_PROTOCOL_CURRENT < current - age)
     148           0 :               vc |= TALER_MERCHANT_VC_INCOMPATIBLE;
     149             :           }
     150           0 :           if (MERCHANT_PROTOCOL_CURRENT > current)
     151             :           {
     152           0 :             vc |= TALER_MERCHANT_VC_OLDER;
     153           0 :             if (MERCHANT_PROTOCOL_CURRENT - MERCHANT_PROTOCOL_AGE > current)
     154           0 :               vc |= TALER_MERCHANT_VC_INCOMPATIBLE;
     155             :           }
     156             :         }
     157             :       }
     158           0 :       vgh->cb (vgh->cb_cls,
     159             :                &hr,
     160             :                &vi,
     161             :                vc);
     162           0 :       TALER_MERCHANT_config_get_cancel (vgh);
     163           0 :       return;
     164             :     }
     165           0 :   default:
     166             :     /* unexpected response code */
     167           0 :     hr.ec = TALER_JSON_get_error_code (json);
     168           0 :     hr.hint = TALER_JSON_get_error_hint (json);
     169           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     170             :                 "Unexpected response code %u/%d\n",
     171             :                 (unsigned int) response_code,
     172             :                 (int) hr.ec);
     173           0 :     vgh->cb (vgh->cb_cls,
     174             :              &hr,
     175             :              NULL,
     176             :              TALER_MERCHANT_VC_PROTOCOL_ERROR);
     177           0 :     break;
     178             :   }
     179           0 :   TALER_MERCHANT_config_get_cancel (vgh);
     180             : }
     181             : 
     182             : 
     183             : struct TALER_MERCHANT_ConfigGetHandle *
     184           0 : TALER_MERCHANT_config_get (struct GNUNET_CURL_Context *ctx,
     185             :                            const char *backend_url,
     186             :                            TALER_MERCHANT_ConfigCallback config_cb,
     187             :                            void *config_cb_cls)
     188             : {
     189             :   struct TALER_MERCHANT_ConfigGetHandle *vgh;
     190             :   CURL *eh;
     191             : 
     192           0 :   vgh = GNUNET_new (struct TALER_MERCHANT_ConfigGetHandle);
     193           0 :   vgh->ctx = ctx;
     194           0 :   vgh->cb = config_cb;
     195           0 :   vgh->cb_cls = config_cb_cls;
     196           0 :   vgh->url = TALER_url_join (backend_url,
     197             :                              "config",
     198             :                              NULL);
     199           0 :   if (NULL == vgh->url)
     200             :   {
     201           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     202             :                 "Could not construct request URL.\n");
     203           0 :     GNUNET_free (vgh);
     204           0 :     return NULL;
     205             :   }
     206           0 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     207             :               "Requesting URL '%s'\n",
     208             :               vgh->url);
     209           0 :   eh = TALER_MERCHANT_curl_easy_get_ (vgh->url);
     210           0 :   vgh->job = GNUNET_CURL_job_add (ctx,
     211             :                                   eh,
     212             :                                   &handle_config_finished,
     213             :                                   vgh);
     214           0 :   return vgh;
     215             : }
     216             : 
     217             : 
     218             : void
     219           0 : TALER_MERCHANT_config_get_cancel (struct TALER_MERCHANT_ConfigGetHandle *vgh)
     220             : {
     221           0 :   if (NULL != vgh->job)
     222             :   {
     223           0 :     GNUNET_CURL_job_cancel (vgh->job);
     224           0 :     vgh->job = NULL;
     225             :   }
     226           0 :   GNUNET_free (vgh->url);
     227           0 :   GNUNET_free (vgh);
     228           0 : }
     229             : 
     230             : 
     231             : /* end of merchant_api_config_get.c */

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