exchange

exchange_api_post-management-wire.c (10482B)

---

 /*
   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-wire.c
  * @brief functions to enable an exchange wire method / bank 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-wire.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 
 
 struct TALER_EXCHANGE_PostManagementWireHandle
 {
 
   /**
    * 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_PostManagementWireCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_EXCHANGE_POST_MANAGEMENT_WIRE_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Payto URI of the exchange's bank account.
    */
   char *payto_uri_str;
 
   /**
    * URL of the conversion service, or NULL.
    */
   char *conversion_url;
 
   /**
    * JSON encoding of debit restrictions (we hold a reference).
    */
   json_t *debit_restrictions;
 
   /**
    * JSON encoding of credit restrictions (we hold a reference).
    */
   json_t *credit_restrictions;
 
   /**
    * When was this decided?
    */
   struct GNUNET_TIME_Timestamp validity_start;
 
   /**
    * Signature affirming the wire addition.
    */
   struct TALER_MasterSignatureP master_sig1;
 
   /**
    * Signature affirming the validity of the account for clients.
    */
   struct TALER_MasterSignatureP master_sig2;
 
   /**
    * Label to use when showing the account to users (or NULL).
    */
   char *bank_label;
 
   /**
    * Priority for ordering the bank accounts.
    */
   int64_t priority;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /management/wire request.
  *
  * @param cls the `struct TALER_EXCHANGE_PostManagementWireHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_wire_finished (void *cls,
                       long response_code,
                       const void *response)
 {
   struct TALER_EXCHANGE_PostManagementWireHandle *pmwh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_PostManagementWireResponse res = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pmwh->job = NULL;
   switch (response_code)
   {
   case 0:
     /* no reply */
     res.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     res.hr.hint = "server offline?";
     break;
   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",
                 pmwh->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;
   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 enable wire\n",
                 (unsigned int) response_code,
                 (int) res.hr.ec);
     break;
   }
   if (NULL != pmwh->cb)
   {
     pmwh->cb (pmwh->cb_cls,
               &res);
     pmwh->cb = NULL;
   }
   TALER_EXCHANGE_post_management_wire_cancel (pmwh);
 }
 
 
 struct TALER_EXCHANGE_PostManagementWireHandle *
 TALER_EXCHANGE_post_management_wire_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const struct TALER_FullPayto payto_uri,
   const char *conversion_url,
   const json_t *debit_restrictions,
   const json_t *credit_restrictions,
   struct GNUNET_TIME_Timestamp validity_start,
   const struct TALER_MasterSignatureP *master_sig1,
   const struct TALER_MasterSignatureP *master_sig2)
 {
   struct TALER_EXCHANGE_PostManagementWireHandle *pmwh;
   char *msg;
 
   msg = TALER_payto_validate (payto_uri);
   if (NULL != msg)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "payto URI is malformed: %s\n",
                 msg);
     GNUNET_free (msg);
     return NULL;
   }
   pmwh = GNUNET_new (struct TALER_EXCHANGE_PostManagementWireHandle);
   pmwh->ctx = ctx;
   pmwh->base_url = GNUNET_strdup (url);
   pmwh->payto_uri_str = GNUNET_strdup (payto_uri.full_payto);
   pmwh->conversion_url = (NULL != conversion_url)
     ? GNUNET_strdup (conversion_url)
     : NULL;
   pmwh->debit_restrictions = json_incref ((json_t *) debit_restrictions);
   pmwh->credit_restrictions = json_incref ((json_t *) credit_restrictions);
   pmwh->validity_start = validity_start;
   pmwh->master_sig1 = *master_sig1;
   pmwh->master_sig2 = *master_sig2;
   return pmwh;
 }
 
 
 enum GNUNET_GenericReturnValue
 TALER_EXCHANGE_post_management_wire_set_options_ (
   struct TALER_EXCHANGE_PostManagementWireHandle *pmwh,
   unsigned int num_options,
   const struct TALER_EXCHANGE_PostManagementWireOptionValue options[])
 {
   for (unsigned int i = 0; i < num_options; i++)
   {
     const struct TALER_EXCHANGE_PostManagementWireOptionValue *opt
       = &options[i];
 
     switch (opt->option)
     {
     case TALER_EXCHANGE_POST_MANAGEMENT_WIRE_OPTION_END:
       return GNUNET_OK;
     case TALER_EXCHANGE_POST_MANAGEMENT_WIRE_OPTION_BANK_LABEL:
       GNUNET_free (pmwh->bank_label);
       pmwh->bank_label = (NULL != opt->details.bank_label)
         ? GNUNET_strdup (opt->details.bank_label)
         : NULL;
       break;
     case TALER_EXCHANGE_POST_MANAGEMENT_WIRE_OPTION_PRIORITY:
       pmwh->priority = opt->details.priority;
       break;
     default:
       GNUNET_break (0);
       return GNUNET_SYSERR;
     }
   }
   return GNUNET_OK;
 }
 
 
 enum TALER_ErrorCode
 TALER_EXCHANGE_post_management_wire_start (
   struct TALER_EXCHANGE_PostManagementWireHandle *pmwh,
   TALER_EXCHANGE_PostManagementWireCallback cb,
   TALER_EXCHANGE_POST_MANAGEMENT_WIRE_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   json_t *body;
   struct TALER_FullPayto payto_uri = {
     .full_payto = pmwh->payto_uri_str
   };
 
   pmwh->cb = cb;
   pmwh->cb_cls = cb_cls;
   pmwh->url = TALER_url_join (pmwh->base_url,
                               "management/wire",
                               NULL);
   if (NULL == pmwh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   }
   body = GNUNET_JSON_PACK (
     TALER_JSON_pack_full_payto ("payto_uri",
                                 payto_uri),
     GNUNET_JSON_pack_array_incref ("debit_restrictions",
                                    pmwh->debit_restrictions),
     GNUNET_JSON_pack_array_incref ("credit_restrictions",
                                    pmwh->credit_restrictions),
     GNUNET_JSON_pack_allow_null (
       GNUNET_JSON_pack_string ("conversion_url",
                                pmwh->conversion_url)),
     GNUNET_JSON_pack_allow_null (
       GNUNET_JSON_pack_string ("bank_label",
                                pmwh->bank_label)),
     GNUNET_JSON_pack_int64 ("priority",
                             pmwh->priority),
     GNUNET_JSON_pack_data_auto ("master_sig_add",
                                 &pmwh->master_sig1),
     GNUNET_JSON_pack_data_auto ("master_sig_wire",
                                 &pmwh->master_sig2),
     GNUNET_JSON_pack_timestamp ("validity_start",
                                 pmwh->validity_start));
   eh = TALER_EXCHANGE_curl_easy_get_ (pmwh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pmwh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (pmwh->url);
     pmwh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pmwh->url);
   pmwh->job = GNUNET_CURL_job_add2 (pmwh->ctx,
                                     eh,
                                     pmwh->post_ctx.headers,
                                     &handle_wire_finished,
                                     pmwh);
   if (NULL == pmwh->job)
   {
     TALER_curl_easy_post_finished (&pmwh->post_ctx);
     GNUNET_free (pmwh->url);
     pmwh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_EXCHANGE_post_management_wire_cancel (
   struct TALER_EXCHANGE_PostManagementWireHandle *pmwh)
 {
   if (NULL != pmwh->job)
   {
     GNUNET_CURL_job_cancel (pmwh->job);
     pmwh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pmwh->post_ctx);
   json_decref (pmwh->debit_restrictions);
   json_decref (pmwh->credit_restrictions);
   GNUNET_free (pmwh->payto_uri_str);
   GNUNET_free (pmwh->conversion_url);
   GNUNET_free (pmwh->bank_label);
   GNUNET_free (pmwh->url);
   GNUNET_free (pmwh->base_url);
   GNUNET_free (pmwh);
 }
 
 
 /* end of exchange_api_post-management-wire.c */