exchange

exchange_api_post-management-drain.c (7702B)

---

 /*
   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-drain.c
  * @brief functions to drain profits from an exchange account
  * @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-drain.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 
 
 struct TALER_EXCHANGE_PostManagementDrainHandle
 {
 
   /**
    * 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_PostManagementDrainCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_EXCHANGE_POST_MANAGEMENT_DRAIN_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Wire transfer identifier to use.
    */
   struct TALER_WireTransferIdentifierRawP wtid;
 
   /**
    * Total to transfer.
    */
   struct TALER_Amount amount;
 
   /**
    * When was the request created.
    */
   struct GNUNET_TIME_Timestamp date;
 
   /**
    * Configuration section identifying account to debit.
    */
   char *account_section;
 
   /**
    * Payto URI of the account to credit.
    */
   char *payto_uri_str;
 
   /**
    * Signature affirming the operation.
    */
   struct TALER_MasterSignatureP master_sig;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /management/drain request.
  *
  * @param cls the `struct TALER_EXCHANGE_PostManagementDrainHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_drain_finished (void *cls,
                        long response_code,
                        const void *response)
 {
   struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_PostManagementDrainResponse res = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pmdh->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_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 drain profits\n",
                 (unsigned int) response_code,
                 (int) res.hr.ec);
     break;
   }
   if (NULL != pmdh->cb)
   {
     pmdh->cb (pmdh->cb_cls,
               &res);
     pmdh->cb = NULL;
   }
   TALER_EXCHANGE_post_management_drain_cancel (pmdh);
 }
 
 
 struct TALER_EXCHANGE_PostManagementDrainHandle *
 TALER_EXCHANGE_post_management_drain_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const struct TALER_WireTransferIdentifierRawP *wtid,
   const struct TALER_Amount *amount,
   struct GNUNET_TIME_Timestamp date,
   const char *account_section,
   const struct TALER_FullPayto payto_uri,
   const struct TALER_MasterSignatureP *master_sig)
 {
   struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh;
 
   pmdh = GNUNET_new (struct TALER_EXCHANGE_PostManagementDrainHandle);
   pmdh->ctx = ctx;
   pmdh->base_url = GNUNET_strdup (url);
   pmdh->wtid = *wtid;
   pmdh->amount = *amount;
   pmdh->date = date;
   pmdh->account_section = GNUNET_strdup (account_section);
   pmdh->payto_uri_str = GNUNET_strdup (payto_uri.full_payto);
   pmdh->master_sig = *master_sig;
   return pmdh;
 }
 
 
 enum TALER_ErrorCode
 TALER_EXCHANGE_post_management_drain_start (
   struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh,
   TALER_EXCHANGE_PostManagementDrainCallback cb,
   TALER_EXCHANGE_POST_MANAGEMENT_DRAIN_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   json_t *body;
   struct TALER_FullPayto payto_uri = {
     .full_payto = pmdh->payto_uri_str
   };
 
   pmdh->cb = cb;
   pmdh->cb_cls = cb_cls;
   pmdh->url = TALER_url_join (pmdh->base_url,
                               "management/drain",
                               NULL);
   if (NULL == pmdh->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_string ("debit_account_section",
                              pmdh->account_section),
     TALER_JSON_pack_full_payto ("credit_payto_uri",
                                 payto_uri),
     GNUNET_JSON_pack_data_auto ("wtid",
                                 &pmdh->wtid),
     GNUNET_JSON_pack_data_auto ("master_sig",
                                 &pmdh->master_sig),
     GNUNET_JSON_pack_timestamp ("date",
                                 pmdh->date),
     TALER_JSON_pack_amount ("amount",
                             &pmdh->amount));
   eh = TALER_EXCHANGE_curl_easy_get_ (pmdh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pmdh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (pmdh->url);
     pmdh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pmdh->url);
   pmdh->job = GNUNET_CURL_job_add2 (pmdh->ctx,
                                     eh,
                                     pmdh->post_ctx.headers,
                                     &handle_drain_finished,
                                     pmdh);
   if (NULL == pmdh->job)
   {
     TALER_curl_easy_post_finished (&pmdh->post_ctx);
     GNUNET_free (pmdh->url);
     pmdh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_EXCHANGE_post_management_drain_cancel (
   struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh)
 {
   if (NULL != pmdh->job)
   {
     GNUNET_CURL_job_cancel (pmdh->job);
     pmdh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pmdh->post_ctx);
   GNUNET_free (pmdh->account_section);
   GNUNET_free (pmdh->payto_uri_str);
   GNUNET_free (pmdh->url);
   GNUNET_free (pmdh->base_url);
   GNUNET_free (pmdh);
 }
 
 
 /* end of exchange_api_post-management-drain.c */