exchange

exchange_api_post-management-global-fees.c (8852B)

---

 /*
   This file is part of TALER
   Copyright (C) 2020-2026 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-global-fees.c
  * @brief functions to set global fees at an 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 "taler/taler-exchange/post-management-global-fees.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 
 
 struct TALER_EXCHANGE_PostManagementGlobalFeesHandle
 {
 
   /**
    * 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_PostManagementGlobalFeesCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_EXCHANGE_POST_MANAGEMENT_GLOBAL_FEES_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Start of validity period.
    */
   struct GNUNET_TIME_Timestamp validity_start;
 
   /**
    * End of validity period.
    */
   struct GNUNET_TIME_Timestamp validity_end;
 
   /**
    * Global fees for this time period.
    */
   struct TALER_GlobalFeeSet fees;
 
   /**
    * When do purses time out.
    */
   struct GNUNET_TIME_Relative purse_timeout;
 
   /**
    * How long are account histories preserved.
    */
   struct GNUNET_TIME_Relative history_expiration;
 
   /**
    * How many purses are free per account.
    */
   uint32_t purse_account_limit;
 
   /**
    * Signature affirming the global fees.
    */
   struct TALER_MasterSignatureP master_sig;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /management/global-fees request.
  *
  * @param cls the `struct TALER_EXCHANGE_PostManagementGlobalFeesHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_global_fees_finished (void *cls,
                              long response_code,
                              const void *response)
 {
   struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_PostManagementGlobalFeesResponse res = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pmgfh->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:
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Server did not find handler at `%s'. Did you configure the correct exchange base URL?\n",
                 pmgfh->url);
     if (NULL != json)
     {
       res.hr.ec = TALER_JSON_get_error_code (json);
       res.hr.hint = TALER_JSON_get_error_hint (json);
     }
     else
     {
       res.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
       res.hr.hint = TALER_ErrorCode_get_hint (res.hr.ec);
     }
     break;
   case MHD_HTTP_CONFLICT:
     res.hr.ec = TALER_JSON_get_error_code (json);
     res.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_PRECONDITION_FAILED:
     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 set global fee\n",
                 (unsigned int) response_code,
                 (int) res.hr.ec);
     break;
   }
   if (NULL != pmgfh->cb)
   {
     pmgfh->cb (pmgfh->cb_cls,
                &res);
     pmgfh->cb = NULL;
   }
   TALER_EXCHANGE_post_management_global_fees_cancel (pmgfh);
 }
 
 
 struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *
 TALER_EXCHANGE_post_management_global_fees_create (
   struct GNUNET_CURL_Context *ctx,
   const char *exchange_base_url,
   struct GNUNET_TIME_Timestamp validity_start,
   struct GNUNET_TIME_Timestamp validity_end,
   const struct TALER_GlobalFeeSet *fees,
   struct GNUNET_TIME_Relative purse_timeout,
   struct GNUNET_TIME_Relative history_expiration,
   uint32_t purse_account_limit,
   const struct TALER_MasterSignatureP *master_sig)
 {
   struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh;
 
   pmgfh = GNUNET_new (struct TALER_EXCHANGE_PostManagementGlobalFeesHandle);
   pmgfh->ctx = ctx;
   pmgfh->base_url = GNUNET_strdup (exchange_base_url);
   pmgfh->validity_start = validity_start;
   pmgfh->validity_end = validity_end;
   pmgfh->fees = *fees;
   pmgfh->purse_timeout = purse_timeout;
   pmgfh->history_expiration = history_expiration;
   pmgfh->purse_account_limit = purse_account_limit;
   pmgfh->master_sig = *master_sig;
   return pmgfh;
 }
 
 
 enum TALER_ErrorCode
 TALER_EXCHANGE_post_management_global_fees_start (
   struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh,
   TALER_EXCHANGE_PostManagementGlobalFeesCallback cb,
   TALER_EXCHANGE_POST_MANAGEMENT_GLOBAL_FEES_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   json_t *body;
 
   pmgfh->cb = cb;
   pmgfh->cb_cls = cb_cls;
   pmgfh->url = TALER_url_join (pmgfh->base_url,
                                "management/global-fee",
                                NULL);
   if (NULL == pmgfh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   }
   body = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_data_auto ("master_sig",
                                 &pmgfh->master_sig),
     GNUNET_JSON_pack_timestamp ("fee_start",
                                 pmgfh->validity_start),
     GNUNET_JSON_pack_timestamp ("fee_end",
                                 pmgfh->validity_end),
     TALER_JSON_pack_amount ("history_fee",
                             &pmgfh->fees.history),
     TALER_JSON_pack_amount ("account_fee",
                             &pmgfh->fees.account),
     TALER_JSON_pack_amount ("purse_fee",
                             &pmgfh->fees.purse),
     GNUNET_JSON_pack_time_rel ("purse_timeout",
                                pmgfh->purse_timeout),
     GNUNET_JSON_pack_time_rel ("history_expiration",
                                pmgfh->history_expiration),
     GNUNET_JSON_pack_uint64 ("purse_account_limit",
                              pmgfh->purse_account_limit));
   eh = TALER_EXCHANGE_curl_easy_get_ (pmgfh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pmgfh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (pmgfh->url);
     pmgfh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pmgfh->url);
   pmgfh->job = GNUNET_CURL_job_add2 (pmgfh->ctx,
                                      eh,
                                      pmgfh->post_ctx.headers,
                                      &handle_global_fees_finished,
                                      pmgfh);
   if (NULL == pmgfh->job)
   {
     GNUNET_break (0);
     TALER_curl_easy_post_finished (&pmgfh->post_ctx);
     GNUNET_free (pmgfh->url);
     pmgfh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_EXCHANGE_post_management_global_fees_cancel (
   struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh)
 {
   if (NULL != pmgfh->job)
   {
     GNUNET_CURL_job_cancel (pmgfh->job);
     pmgfh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pmgfh->post_ctx);
   GNUNET_free (pmgfh->url);
   GNUNET_free (pmgfh->base_url);
   GNUNET_free (pmgfh);
 }
 
 
 /* end of exchange_api_post-management-global-fees.c */