Line data    Source code

       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2015-2024 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it under the
       6             :   terms of the GNU General Public License as published by the Free Software
       7             :   Foundation; either version 3, 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 General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU General Public License along with
      14             :   TALER; see the file COPYING.  If not, see
      15             :   <http://www.gnu.org/licenses/>
      16             : */
      17             : /**
      18             :  * @file lib/exchange_api_management_revoke_denomination_key.c
      19             :  * @brief functions to revoke an exchange denomination key
      20             :  * @author Christian Grothoff
      21             :  */
      22             : #include "platform.h"
      23             : #include "taler_json_lib.h"
      24             : #include <gnunet/gnunet_curl_lib.h>
      25             : #include <microhttpd.h>
      26             : #include "taler_exchange_service.h"
      27             : #include "exchange_api_curl_defaults.h"
      28             : #include "taler_signatures.h"
      29             : #include "taler_curl_lib.h"
      30             : #include "taler_json_lib.h"
      31             : 
      32             : 
      33             : /**
      34             :  * @brief Handle for a POST /management/denominations/$H_DENOM_PUB/revoke request.
      35             :  */
      36             : struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle
      37             : {
      38             : 
      39             :   /**
      40             :    * The url for this request.
      41             :    */
      42             :   char *url;
      43             : 
      44             :   /**
      45             :    * Minor context that holds body and headers.
      46             :    */
      47             :   struct TALER_CURL_PostContext post_ctx;
      48             : 
      49             :   /**
      50             :    * Handle for the request.
      51             :    */
      52             :   struct GNUNET_CURL_Job *job;
      53             : 
      54             :   /**
      55             :    * Function to call with the result.
      56             :    */
      57             :   TALER_EXCHANGE_ManagementRevokeDenominationKeyCallback cb;
      58             : 
      59             :   /**
      60             :    * Closure for @a cb.
      61             :    */
      62             :   void *cb_cls;
      63             : 
      64             :   /**
      65             :    * Reference to the execution context.
      66             :    */
      67             :   struct GNUNET_CURL_Context *ctx;
      68             : };
      69             : 
      70             : 
      71             : /**
      72             :  * Function called when we're done processing the
      73             :  * HTTP /management/denominations/$H_DENOM_PUB/revoke request.
      74             :  *
      75             :  * @param cls the `struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *`
      76             :  * @param response_code HTTP response code, 0 on error
      77             :  * @param response response body, NULL if not in JSON
      78             :  */
      79             : static void
      80           0 : handle_revoke_denomination_finished (void *cls,
      81             :                                      long response_code,
      82             :                                      const void *response)
      83             : {
      84           0 :   struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh = cls;
      85           0 :   const json_t *json = response;
      86           0 :   struct TALER_EXCHANGE_ManagementRevokeDenominationResponse rdr = {
      87           0 :     .hr.http_status = (unsigned int) response_code,
      88             :     .hr.reply = json
      89             :   };
      90             : 
      91           0 :   rh->job = NULL;
      92           0 :   switch (response_code)
      93             :   {
      94           0 :   case 0:
      95             :     /* no reply */
      96           0 :     rdr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
      97           0 :     rdr.hr.hint = "server offline?";
      98           0 :     break;
      99           0 :   case MHD_HTTP_NO_CONTENT:
     100           0 :     break;
     101           0 :   case MHD_HTTP_FORBIDDEN:
     102           0 :     rdr.hr.ec = TALER_JSON_get_error_code (json);
     103           0 :     rdr.hr.hint = TALER_JSON_get_error_hint (json);
     104           0 :     break;
     105           0 :   default:
     106             :     /* unexpected response code */
     107           0 :     GNUNET_break_op (0);
     108           0 :     rdr.hr.ec = TALER_JSON_get_error_code (json);
     109           0 :     rdr.hr.hint = TALER_JSON_get_error_hint (json);
     110           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     111             :                 "Unexpected response code %u/%d for exchange management revoke denomination\n",
     112             :                 (unsigned int) response_code,
     113             :                 (int) rdr.hr.ec);
     114           0 :     break;
     115             :   }
     116           0 :   if (NULL != rh->cb)
     117             :   {
     118           0 :     rh->cb (rh->cb_cls,
     119             :             &rdr);
     120           0 :     rh->cb = NULL;
     121             :   }
     122           0 :   TALER_EXCHANGE_management_revoke_denomination_key_cancel (rh);
     123           0 : }
     124             : 
     125             : 
     126             : struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *
     127           0 : TALER_EXCHANGE_management_revoke_denomination_key (
     128             :   struct GNUNET_CURL_Context *ctx,
     129             :   const char *url,
     130             :   const struct TALER_DenominationHashP *h_denom_pub,
     131             :   const struct TALER_MasterSignatureP *master_sig,
     132             :   TALER_EXCHANGE_ManagementRevokeDenominationKeyCallback cb,
     133             :   void *cb_cls)
     134             : {
     135             :   struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh;
     136             :   CURL *eh;
     137             :   json_t *body;
     138             : 
     139           0 :   rh = GNUNET_new (struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle);
     140           0 :   rh->cb = cb;
     141           0 :   rh->cb_cls = cb_cls;
     142           0 :   rh->ctx = ctx;
     143             :   {
     144             :     char epub_str[sizeof (*h_denom_pub) * 2];
     145             :     char arg_str[sizeof (epub_str) + 64];
     146             :     char *end;
     147             : 
     148           0 :     end = GNUNET_STRINGS_data_to_string (h_denom_pub,
     149             :                                          sizeof (*h_denom_pub),
     150             :                                          epub_str,
     151             :                                          sizeof (epub_str));
     152           0 :     *end = '\0';
     153           0 :     GNUNET_snprintf (arg_str,
     154             :                      sizeof (arg_str),
     155             :                      "management/denominations/%s/revoke",
     156             :                      epub_str);
     157           0 :     rh->url = TALER_url_join (url,
     158             :                               arg_str,
     159             :                               NULL);
     160             :   }
     161           0 :   if (NULL == rh->url)
     162             :   {
     163           0 :     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     164             :                 "Could not construct request URL.\n");
     165           0 :     GNUNET_free (rh);
     166           0 :     return NULL;
     167             :   }
     168           0 :   body = GNUNET_JSON_PACK (
     169             :     GNUNET_JSON_pack_data_auto ("master_sig",
     170             :                                 master_sig));
     171           0 :   if (NULL == body)
     172             :   {
     173           0 :     GNUNET_break (0);
     174           0 :     GNUNET_free (rh->url);
     175           0 :     GNUNET_free (rh);
     176           0 :     return NULL;
     177             :   }
     178           0 :   eh = TALER_EXCHANGE_curl_easy_get_ (rh->url);
     179           0 :   if ( (NULL == eh) ||
     180             :        (GNUNET_OK !=
     181           0 :         TALER_curl_easy_post (&rh->post_ctx,
     182             :                               eh,
     183             :                               body)) )
     184             :   {
     185           0 :     GNUNET_break (0);
     186           0 :     if (NULL != eh)
     187           0 :       curl_easy_cleanup (eh);
     188           0 :     json_decref (body);
     189           0 :     GNUNET_free (rh->url);
     190           0 :     GNUNET_free (rh);
     191           0 :     return NULL;
     192             :   }
     193           0 :   json_decref (body);
     194           0 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     195             :               "Requesting URL '%s'\n",
     196             :               rh->url);
     197           0 :   rh->job = GNUNET_CURL_job_add2 (ctx,
     198             :                                   eh,
     199           0 :                                   rh->post_ctx.headers,
     200             :                                   &handle_revoke_denomination_finished,
     201             :                                   rh);
     202           0 :   if (NULL == rh->job)
     203             :   {
     204           0 :     TALER_EXCHANGE_management_revoke_denomination_key_cancel (rh);
     205           0 :     return NULL;
     206             :   }
     207           0 :   return rh;
     208             : }
     209             : 
     210             : 
     211             : void
     212           0 : TALER_EXCHANGE_management_revoke_denomination_key_cancel (
     213             :   struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh)
     214             : {
     215           0 :   if (NULL != rh->job)
     216             :   {
     217           0 :     GNUNET_CURL_job_cancel (rh->job);
     218           0 :     rh->job = NULL;
     219             :   }
     220           0 :   TALER_curl_easy_post_finished (&rh->post_ctx);
     221           0 :   GNUNET_free (rh->url);
     222           0 :   GNUNET_free (rh);
     223           0 : }