exchange

exchange_api_kyc_wallet.c (7168B)

---

 /*
   This file is part of TALER
   Copyright (C) 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_kyc_wallet.c
  * @brief Implementation of the /kyc-wallet request
  * @author Christian Grothoff
  */
 #include "taler/platform.h"
 #include <microhttpd.h> /* just for HTTP wallet codes */
 #include <gnunet/gnunet_util_lib.h>
 #include <gnunet/gnunet_curl_lib.h>
 #include "taler/taler_exchange_service.h"
 #include "taler/taler_json_lib.h"
 #include "exchange_api_handle.h"
 #include "taler/taler_signatures.h"
 #include "exchange_api_curl_defaults.h"
 
 
 /**
  * @brief A ``/kyc-wallet`` handle
  */
 struct TALER_EXCHANGE_KycWalletHandle
 {
 
   /**
    * Context for #TEH_curl_easy_post(). Keeps the data that must
    * persist for Curl to make the upload.
    */
   struct TALER_CURL_PostContext ctx;
 
   /**
    * The url for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_EXCHANGE_KycWalletCallback cb;
 
   /**
    * Closure for @e cb.
    */
   void *cb_cls;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP /kyc-wallet request.
  *
  * @param cls the `struct TALER_EXCHANGE_KycWalletHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response parsed JSON result, NULL on error
  */
 static void
 handle_kyc_wallet_finished (void *cls,
                             long response_code,
                             const void *response)
 {
   struct TALER_EXCHANGE_KycWalletHandle *kwh = cls;
   const json_t *j = response;
   struct TALER_EXCHANGE_WalletKycResponse ks = {
     .hr.reply = j,
     .hr.http_status = (unsigned int) response_code
   };
 
   kwh->job = NULL;
   switch (response_code)
   {
   case 0:
     ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_OK:
     {
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_mark_optional (
           TALER_JSON_spec_amount_any (
             "next_threshold",
             &ks.details.ok.next_threshold),
           NULL),
         GNUNET_JSON_spec_timestamp (
           "expiration_time",
           &ks.details.ok.expiration_time),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (j,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         ks.hr.http_status = 0;
         ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
         break;
       }
       break;
     }
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_BAD_REQUEST:
     ks.hr.ec = TALER_JSON_get_error_code (j);
     /* This should never happen, either us or the exchange is buggy
        (or API version conflict); just pass JSON reply to the application */
     break;
   case MHD_HTTP_FORBIDDEN:
     ks.hr.ec = TALER_JSON_get_error_code (j);
     break;
   case MHD_HTTP_NOT_FOUND:
     ks.hr.ec = TALER_JSON_get_error_code (j);
     break;
   case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
     {
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_fixed_auto (
           "h_payto",
           &ks.details.unavailable_for_legal_reasons.h_payto),
         GNUNET_JSON_spec_uint64 (
           "requirement_row",
           &ks.details.unavailable_for_legal_reasons.requirement_row),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (j,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         ks.hr.http_status = 0;
         ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
         break;
       }
       break;
     }
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     ks.hr.ec = TALER_JSON_get_error_code (j);
     /* Server had an internal issue; we should retry, but this API
        leaves this to the application */
     break;
   default:
     /* unexpected response code */
     GNUNET_break_op (0);
     ks.hr.ec = TALER_JSON_get_error_code (j);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d for exchange /kyc-wallet\n",
                 (unsigned int) response_code,
                 (int) ks.hr.ec);
     break;
   }
   kwh->cb (kwh->cb_cls,
            &ks);
   TALER_EXCHANGE_kyc_wallet_cancel (kwh);
 }
 
 
 struct TALER_EXCHANGE_KycWalletHandle *
 TALER_EXCHANGE_kyc_wallet (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const struct TALER_ReservePrivateKeyP *reserve_priv,
   const struct TALER_Amount *balance,
   TALER_EXCHANGE_KycWalletCallback cb,
   void *cb_cls)
 {
   struct TALER_EXCHANGE_KycWalletHandle *kwh;
   CURL *eh;
   json_t *req;
   struct TALER_ReservePublicKeyP reserve_pub;
   struct TALER_ReserveSignatureP reserve_sig;
 
   GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
                                       &reserve_pub.eddsa_pub);
   TALER_wallet_account_setup_sign (reserve_priv,
                                    balance,
                                    &reserve_sig);
   req = GNUNET_JSON_PACK (
     TALER_JSON_pack_amount ("balance",
                             balance),
     GNUNET_JSON_pack_data_auto ("reserve_pub",
                                 &reserve_pub),
     GNUNET_JSON_pack_data_auto ("reserve_sig",
                                 &reserve_sig));
   GNUNET_assert (NULL != req);
   kwh = GNUNET_new (struct TALER_EXCHANGE_KycWalletHandle);
   kwh->cb = cb;
   kwh->cb_cls = cb_cls;
   kwh->url = TALER_url_join (url,
                              "kyc-wallet",
                              NULL);
   if (NULL == kwh->url)
   {
     json_decref (req);
     GNUNET_free (kwh);
     return NULL;
   }
   eh = TALER_EXCHANGE_curl_easy_get_ (kwh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&kwh->ctx,
                               eh,
                               req)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (req);
     GNUNET_free (kwh->url);
     GNUNET_free (kwh);
     return NULL;
   }
   json_decref (req);
   kwh->job = GNUNET_CURL_job_add2 (ctx,
                                    eh,
                                    kwh->ctx.headers,
                                    &handle_kyc_wallet_finished,
                                    kwh);
   return kwh;
 }
 
 
 void
 TALER_EXCHANGE_kyc_wallet_cancel (struct TALER_EXCHANGE_KycWalletHandle *kwh)
 {
   if (NULL != kwh->job)
   {
     GNUNET_CURL_job_cancel (kwh->job);
     kwh->job = NULL;
   }
   GNUNET_free (kwh->url);
   TALER_curl_easy_post_finished (&kwh->ctx);
   GNUNET_free (kwh);
 }
 
 
 /* end of exchange_api_kyc_wallet.c */