exchange

exchange_api_auditor_add_denomination.c (7010B)

---

 /*
   This file is part of TALER
   Copyright (C) 2015-2021 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_auditor_add_denomination.c
  * @brief functions for the auditor to add its signature for denomination at the exchange
  * @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 "auditor_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 #include "taler/taler_json_lib.h"
 
 
 struct TALER_EXCHANGE_AuditorAddDenominationHandle
 {
 
   /**
    * The url for this request.
    */
   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_AuditorAddDenominationCallback cb;
 
   /**
    * Closure for @a cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /auditor/$AUDITOR_PUB/$H_DENOM_PUB request.
  *
  * @param cls the `struct TALER_EXCHANGE_AuditorAddDenominationHandle *`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_auditor_add_denomination_finished (void *cls,
                                           long response_code,
                                           const void *response)
 {
   struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_AuditorAddDenominationResponse adr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   ah->job = NULL;
   switch (response_code)
   {
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_FORBIDDEN:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_NOT_FOUND:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_GONE:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_PRECONDITION_FAILED:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     /* unexpected response code */
     if (NULL != json)
     {
       adr.hr.ec = TALER_JSON_get_error_code (json);
       adr.hr.hint = TALER_JSON_get_error_hint (json);
       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                   "Unexpected response code %u/%d for exchange auditor-add-denomination at URL `%s'\n",
                   (unsigned int) response_code,
                   (int) adr.hr.ec,
                   ah->url);
     }
     else
     {
       adr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
       adr.hr.hint = NULL;
       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                   "Unexpected HTTP response code %u (no JSON returned) at URL `%s'\n",
                   (unsigned int) response_code,
                   ah->url);
     }
     break;
   }
   if (NULL != ah->cb)
   {
     ah->cb (ah->cb_cls,
             &adr);
     ah->cb = NULL;
   }
   TALER_EXCHANGE_add_auditor_denomination_cancel (ah);
 }
 
 
 struct TALER_EXCHANGE_AuditorAddDenominationHandle *
 TALER_EXCHANGE_add_auditor_denomination (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const struct TALER_DenominationHashP *h_denom_pub,
   const struct TALER_AuditorPublicKeyP *auditor_pub,
   const struct TALER_AuditorSignatureP *auditor_sig,
   TALER_EXCHANGE_AuditorAddDenominationCallback cb,
   void *cb_cls)
 {
   struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah;
   CURL *eh;
   json_t *body;
 
   ah = GNUNET_new (struct TALER_EXCHANGE_AuditorAddDenominationHandle);
   ah->cb = cb;
   ah->cb_cls = cb_cls;
   ah->ctx = ctx;
   {
     char apub_str[sizeof (*auditor_pub) * 2];
     char denom_str[sizeof (*h_denom_pub) * 2];
     char arg_str[sizeof (apub_str) + sizeof (denom_str) + 32];
     char *end;
 
     end = GNUNET_STRINGS_data_to_string (auditor_pub,
                                          sizeof (*auditor_pub),
                                          apub_str,
                                          sizeof (apub_str));
     *end = '\0';
     end = GNUNET_STRINGS_data_to_string (h_denom_pub,
                                          sizeof (*h_denom_pub),
                                          denom_str,
                                          sizeof (denom_str));
     *end = '\0';
     GNUNET_snprintf (arg_str,
                      sizeof (arg_str),
                      "auditors/%s/%s",
                      apub_str,
                      denom_str);
     ah->url = TALER_url_join (url,
                               arg_str,
                               NULL);
   }
   if (NULL == ah->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (ah);
     return NULL;
   }
   body = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_data_auto ("auditor_sig",
                                 auditor_sig));
   eh = TALER_AUDITOR_curl_easy_get_ (ah->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&ah->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (ah->url);
     return NULL;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               ah->url);
   ah->job = GNUNET_CURL_job_add2 (ctx,
                                   eh,
                                   ah->post_ctx.headers,
                                   &handle_auditor_add_denomination_finished,
                                   ah);
   if (NULL == ah->job)
   {
     TALER_EXCHANGE_add_auditor_denomination_cancel (ah);
     return NULL;
   }
   return ah;
 }
 
 
 void
 TALER_EXCHANGE_add_auditor_denomination_cancel (
   struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah)
 {
   if (NULL != ah->job)
   {
     GNUNET_CURL_job_cancel (ah->job);
     ah->job = NULL;
   }
   TALER_curl_easy_post_finished (&ah->post_ctx);
   GNUNET_free (ah->url);
   GNUNET_free (ah);
 }