exchange

exchange_api_post-management-keys.c (8762B)

---

 /*
   This file is part of TALER
   Copyright (C) 2015-2026 Taler Systems SA
 
   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU General Public License as published by the Free Software
   Foundation; either version 3, 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 General Public License for more details.
 
   You should have received a copy of the GNU General Public License along with
   TALER; see the file COPYING.  If not, see
   <http://www.gnu.org/licenses/>
 */
 /**
  * @file lib/exchange_api_post-management-keys.c
  * @brief functions to affirm the validity of exchange keys using the master private key
  * @author Christian Grothoff
  */
 #include "taler/platform.h"
 #include "taler/taler_json_lib.h"
 #include <gnunet/gnunet_curl_lib.h>
 #include <microhttpd.h>
 #include "taler/taler_exchange_service.h"
 #include "taler/taler-exchange/post-management-keys.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 
 
 /**
  * @brief Handle for a POST /management/keys request.
  */
 struct TALER_EXCHANGE_PostManagementKeysHandle
 {
 
   /**
    * The base URL for this request.
    */
   char *base_url;
 
   /**
    * The full URL for this request, set during _start.
    */
   char *url;
 
   /**
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_EXCHANGE_PostManagementKeysCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_EXCHANGE_POST_MANAGEMENT_KEYS_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Array of master signatures for the exchange's online signing keys.
    */
   struct TALER_EXCHANGE_SigningKeySignature *sign_sigs;
 
   /**
    * Length of the @e sign_sigs array.
    */
   unsigned int num_sign_sigs;
 
   /**
    * Array of master signatures for the exchange's denomination keys.
    */
   struct TALER_EXCHANGE_DenominationKeySignature *denom_sigs;
 
   /**
    * Length of the @e denom_sigs array.
    */
   unsigned int num_denom_sigs;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /management/keys request.
  *
  * @param cls the `struct TALER_EXCHANGE_PostManagementKeysHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_post_keys_finished (void *cls,
                            long response_code,
                            const void *response)
 {
   struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_PostManagementKeysResponse res = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pmkh->job = NULL;
   switch (response_code)
   {
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_FORBIDDEN:
     res.hr.ec = TALER_JSON_get_error_code (json);
     res.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_NOT_FOUND:
     res.hr.ec = TALER_JSON_get_error_code (json);
     res.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_REQUEST_ENTITY_TOO_LARGE:
     res.hr.ec = TALER_JSON_get_error_code (json);
     res.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     /* unexpected response code */
     GNUNET_break_op (0);
     res.hr.ec = TALER_JSON_get_error_code (json);
     res.hr.hint = TALER_JSON_get_error_hint (json);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d for exchange management post keys\n",
                 (unsigned int) response_code,
                 (int) res.hr.ec);
     break;
   }
   if (NULL != pmkh->cb)
   {
     pmkh->cb (pmkh->cb_cls,
               &res);
     pmkh->cb = NULL;
   }
   TALER_EXCHANGE_post_management_keys_cancel (pmkh);
 }
 
 
 struct TALER_EXCHANGE_PostManagementKeysHandle *
 TALER_EXCHANGE_post_management_keys_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const struct TALER_EXCHANGE_ManagementPostKeysData *pkd)
 {
   struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh;
 
   pmkh = GNUNET_new (struct TALER_EXCHANGE_PostManagementKeysHandle);
   pmkh->ctx = ctx;
   pmkh->base_url = GNUNET_strdup (url);
   pmkh->num_sign_sigs = pkd->num_sign_sigs;
   pmkh->num_denom_sigs = pkd->num_denom_sigs;
   pmkh->sign_sigs = GNUNET_memdup (pkd->sign_sigs,
                                    pkd->num_sign_sigs
                                    * sizeof (struct
                                              TALER_EXCHANGE_SigningKeySignature));
   pmkh->denom_sigs = GNUNET_memdup (pkd->denom_sigs,
                                     pkd->num_denom_sigs
                                     * sizeof (struct
                                               TALER_EXCHANGE_DenominationKeySignature));
   return pmkh;
 }
 
 
 enum TALER_ErrorCode
 TALER_EXCHANGE_post_management_keys_start (
   struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh,
   TALER_EXCHANGE_PostManagementKeysCallback cb,
   TALER_EXCHANGE_POST_MANAGEMENT_KEYS_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   json_t *body;
   json_t *denom_sigs;
   json_t *signkey_sigs;
 
   pmkh->cb = cb;
   pmkh->cb_cls = cb_cls;
   pmkh->url = TALER_url_join (pmkh->base_url,
                               "management/keys",
                               NULL);
   if (NULL == pmkh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   }
   denom_sigs = json_array ();
   GNUNET_assert (NULL != denom_sigs);
   for (unsigned int i = 0; i < pmkh->num_denom_sigs; i++)
   {
     const struct TALER_EXCHANGE_DenominationKeySignature *dks
       = &pmkh->denom_sigs[i];
 
     GNUNET_assert (0 ==
                    json_array_append_new (
                      denom_sigs,
                      GNUNET_JSON_PACK (
                        GNUNET_JSON_pack_data_auto ("h_denom_pub",
                                                    &dks->h_denom_pub),
                        GNUNET_JSON_pack_data_auto ("master_sig",
                                                    &dks->master_sig))));
   }
   signkey_sigs = json_array ();
   GNUNET_assert (NULL != signkey_sigs);
   for (unsigned int i = 0; i < pmkh->num_sign_sigs; i++)
   {
     const struct TALER_EXCHANGE_SigningKeySignature *sks
       = &pmkh->sign_sigs[i];
 
     GNUNET_assert (0 ==
                    json_array_append_new (
                      signkey_sigs,
                      GNUNET_JSON_PACK (
                        GNUNET_JSON_pack_data_auto ("exchange_pub",
                                                    &sks->exchange_pub),
                        GNUNET_JSON_pack_data_auto ("master_sig",
                                                    &sks->master_sig))));
   }
   body = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_array_steal ("denom_sigs",
                                   denom_sigs),
     GNUNET_JSON_pack_array_steal ("signkey_sigs",
                                   signkey_sigs));
   eh = TALER_EXCHANGE_curl_easy_get_ (pmkh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pmkh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (pmkh->url);
     pmkh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pmkh->url);
   pmkh->job = GNUNET_CURL_job_add2 (pmkh->ctx,
                                     eh,
                                     pmkh->post_ctx.headers,
                                     &handle_post_keys_finished,
                                     pmkh);
   if (NULL == pmkh->job)
   {
     TALER_curl_easy_post_finished (&pmkh->post_ctx);
     GNUNET_free (pmkh->url);
     pmkh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_EXCHANGE_post_management_keys_cancel (
   struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh)
 {
   if (NULL != pmkh->job)
   {
     GNUNET_CURL_job_cancel (pmkh->job);
     pmkh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pmkh->post_ctx);
   GNUNET_free (pmkh->sign_sigs);
   GNUNET_free (pmkh->denom_sigs);
   GNUNET_free (pmkh->url);
   GNUNET_free (pmkh->base_url);
   GNUNET_free (pmkh);
 }
 
 
 /* end of exchange_api_post-management-keys.c */