exchange

taler-exchange-kyc-trigger.c (11040B)

---

 /*
    This file is part of TALER
    Copyright (C) 2020-2024 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 taler-exchange-kyc-trigger.c
  * @brief Support for manually triggering KYC/AML processes for testing
  * @author Christian Grothoff
  */
 #include "taler/platform.h"
 #include <gnunet/gnunet_json_lib.h>
 #include <gnunet/gnunet_util_lib.h>
 #include <microhttpd.h>
 #include "taler/taler_json_lib.h"
 #include "taler/taler-exchange/get-kyc-check-H_NORMALIZED_PAYTO.h"
 #include "taler/taler_exchange_service.h"
 
 
 /**
  * Our private key.
  */
 static struct TALER_ReservePrivateKeyP reserve_priv;
 
 /**
  * Our public key.
  */
 static struct TALER_ReservePublicKeyP reserve_pub;
 
 /**
  * Our context for making HTTP requests.
  */
 static struct GNUNET_CURL_Context *ctx;
 
 /**
  * Reschedule context for #ctx.
  */
 static struct GNUNET_CURL_RescheduleContext *rc;
 
 /**
  * Handle to the exchange's configuration
  */
 static const struct GNUNET_CONFIGURATION_Handle *kcfg;
 
 /**
  * Handle for exchange interaction.
  */
 static struct TALER_EXCHANGE_PostKycWalletHandle *kwh;
 
 /**
  * Handle for exchange kyc-check interaction.
  */
 static struct TALER_EXCHANGE_GetKycCheckHandle *kc;
 
 /**
  * Balance threshold to report to the exchange.
  */
 static struct TALER_Amount balance;
 
 /**
  * Return value from main().
  */
 static int global_ret;
 
 /**
  * Currency we have configured.
  */
 static char *currency;
 
 /**
  * URL of the exchange we are interacting with
  * as per our configuration.
  */
 static char *CFG_exchange_url;
 
 
 /**
  * Function called with the result of a KYC check.
  *
  * @param cls closure
  * @param ks the account's KYC status details
  */
 static void
 kyc_status_cb (
   void *cls,
   const struct TALER_EXCHANGE_GetKycCheckResponse *ks)
 {
   kc = NULL;
   switch (ks->hr.http_status)
   {
   case MHD_HTTP_OK:
     {
       char *buf;
 
       buf = GNUNET_STRINGS_data_to_string_alloc (
         &ks->details.ok.access_token,
         sizeof (ks->details.ok.access_token));
       fprintf (stdout,
                "KYC SPA at %skyc-spa/%s\n",
                CFG_exchange_url,
                buf);
       GNUNET_free (buf);
     }
     break;
   case MHD_HTTP_ACCEPTED:
     {
       char *buf;
 
       buf = GNUNET_STRINGS_data_to_string_alloc (
         &ks->details.ok.access_token,
         sizeof (ks->details.ok.access_token));
       fprintf (stdout,
                "KYC SPA at %skyc-spa/%s\n",
                CFG_exchange_url,
                buf);
       GNUNET_free (buf);
     }
     break;
   case MHD_HTTP_FORBIDDEN:
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "KYC auth now required?\n");
     break;
   }
   GNUNET_SCHEDULER_shutdown ();
 }
 
 
 /**
  * Function called with the result for a wallet looking
  * up its KYC payment target.
  *
  * @param cls closure
  * @param ks the wallets KYC payment target details
  */
 static void
 kyc_wallet_cb (
   void *cls,
   const struct TALER_EXCHANGE_PostKycWalletResponse *ks)
 {
   kwh = NULL;
   switch (ks->hr.http_status)
   {
   case MHD_HTTP_OK:
     fprintf (stdout,
              "OK, next threshold at %s\n",
              TALER_amount2s (&ks->details.ok.next_threshold));
     break;
   case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
     {
       const struct TALER_EXCHANGE_KycNeededRedirect *knr
         = &ks->details.unavailable_for_legal_reasons;
       char *ps;
 
       ps = GNUNET_STRINGS_data_to_string_alloc (&knr->h_payto,
                                                 sizeof (knr->h_payto));
       fprintf (stderr,
                "KYC needed (%llu, %s) for %s\n",
                (unsigned long long) knr->requirement_row,
                knr->bad_kyc_auth
                ? "KYC auth needed"
                : "KYC auth OK",
                ps);
       GNUNET_free (ps);
       if (! knr->bad_kyc_auth)
       {
         struct TALER_NormalizedPaytoHashP h_payto;
         union TALER_AccountPrivateKeyP pk;
         struct TALER_NormalizedPayto np;
 
         np = TALER_reserve_make_payto (CFG_exchange_url,
                                        &reserve_pub);
         TALER_normalized_payto_hash (np,
                                      &h_payto);
         GNUNET_free (np.normalized_payto);
         pk.reserve_priv = reserve_priv;
         GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                     "Requesting /kyc-check to determine KYC entrypoint\n");
         kc = TALER_EXCHANGE_get_kyc_check_create (ctx,
                                                   CFG_exchange_url,
                                                   &h_payto,
                                                   &pk);
         GNUNET_break (NULL != kc);
         if (NULL == kc)
           break;
         GNUNET_assert (TALER_EC_NONE ==
                        TALER_EXCHANGE_get_kyc_check_start (
                          kc,
                          &kyc_status_cb,
                          NULL));
         return;
       }
     }
     break;
   default:
     fprintf (stdout,
              "Unexpected HTTP status %u\n",
              ks->hr.http_status);
     break;
   }
   GNUNET_SCHEDULER_shutdown ();
 }
 
 
 /**
  * Shutdown task. Invoked when the application is being terminated.
  *
  * @param cls NULL
  */
 static void
 do_shutdown (void *cls)
 {
   (void) cls;
   if (NULL != kwh)
   {
     TALER_EXCHANGE_post_kyc_wallet_cancel (kwh);
     kwh = NULL;
   }
   if (NULL != kc)
   {
     TALER_EXCHANGE_get_kyc_check_cancel (kc);
     kc = NULL;
   }
   if (NULL != ctx)
   {
     GNUNET_CURL_fini (ctx);
     ctx = NULL;
   }
   if (NULL != rc)
   {
     GNUNET_CURL_gnunet_rc_destroy (rc);
     rc = NULL;
   }
 }
 
 
 /**
  * Load the reserve key.
  *
  * @param do_create #GNUNET_YES if the key may be created
  * @return #GNUNET_OK on success
  */
 static enum GNUNET_GenericReturnValue
 load_reserve_key (int do_create)
 {
   char *fn;
 
   if (GNUNET_OK ==
       GNUNET_CONFIGURATION_get_value_filename (kcfg,
                                                "exchange-testing",
                                                "RESERVE_PRIV_FILE",
                                                &fn))
   {
     enum GNUNET_GenericReturnValue ret;
 
     if (GNUNET_YES !=
         GNUNET_DISK_file_test (fn))
       GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                   "Account private key `%s' does not exist yet, creating it!\n",
                   fn);
     ret = GNUNET_CRYPTO_eddsa_key_from_file (fn,
                                              do_create,
                                              &reserve_priv.eddsa_priv);
     if (GNUNET_SYSERR == ret)
     {
       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                   "Failed to initialize master key from file `%s': %s\n",
                   fn,
                   "could not create file");
       GNUNET_free (fn);
       return GNUNET_SYSERR;
     }
     GNUNET_free (fn);
   }
   else
   {
     GNUNET_CRYPTO_eddsa_key_create (&reserve_priv.eddsa_priv);
   }
   GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv.eddsa_priv,
                                       &reserve_pub.eddsa_pub);
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "Using reserve public key %s\n",
               TALER_B2S (&reserve_pub));
   return GNUNET_OK;
 }
 
 
 /**
  * Main function that will be run.
  *
  * @param cls closure
  * @param args remaining command-line arguments
  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
  * @param cfg configuration
  */
 static void
 run (void *cls,
      char *const *args,
      const char *cfgfile,
      const struct GNUNET_CONFIGURATION_Handle *cfg)
 {
   (void) cls;
   (void) cfgfile;
   kcfg = cfg;
 
   if (GNUNET_OK !=
       load_reserve_key (GNUNET_YES))
   {
     GNUNET_break (0);
     global_ret = EXIT_FAILURE;
     return;
   }
   if (GNUNET_OK !=
       TALER_config_get_currency (kcfg,
                                  "exchange",
                                  &currency))
   {
     global_ret = EXIT_NOTCONFIGURED;
     return;
   }
   if ( (GNUNET_OK !=
         TALER_amount_is_valid (&balance)) ||
        (0 != strcmp (balance.currency,
                      currency)) )
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Invalid balance threshold `%s'\n",
                 TALER_amount2s (&balance));
     global_ret = EXIT_FAILURE;
     return;
   }
   if ( (NULL == CFG_exchange_url) &&
        (GNUNET_OK !=
         GNUNET_CONFIGURATION_get_value_string (kcfg,
                                                "exchange",
                                                "BASE_URL",
                                                &CFG_exchange_url)) )
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                "exchange",
                                "BASE_URL");
     global_ret = EXIT_NOTCONFIGURED;
     GNUNET_SCHEDULER_shutdown ();
     return;
   }
   ctx = GNUNET_CURL_init (&GNUNET_CURL_gnunet_scheduler_reschedule,
                           &rc);
   rc = GNUNET_CURL_gnunet_rc_create (ctx);
   GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
                                  NULL);
   kwh = TALER_EXCHANGE_post_kyc_wallet_create (ctx,
                                                CFG_exchange_url,
                                                &reserve_priv,
                                                &balance);
   if (NULL == kwh)
   {
     GNUNET_break (0);
     GNUNET_SCHEDULER_shutdown ();
   }
   GNUNET_assert (TALER_EC_NONE ==
                  TALER_EXCHANGE_post_kyc_wallet_start (kwh,
                                                        &kyc_wallet_cb,
                                                        NULL));
 }
 
 
 /**
  * The main function of the taler-exchange-kyc-trigger tool.
  *
  * @param argc number of arguments from the command line
  * @param argv command line arguments
  * @return 0 ok, 1 on error
  */
 int
 main (int argc,
       char *const *argv)
 {
   struct GNUNET_GETOPT_CommandLineOption options[] = {
     TALER_getopt_get_amount ('b',
                              "balance",
                              "AMOUNT",
                              "balance threshold to report to the exchange",
                              &balance),
     GNUNET_GETOPT_OPTION_END
   };
   enum GNUNET_GenericReturnValue ret;
 
   ret = GNUNET_PROGRAM_run (
     TALER_EXCHANGE_project_data (),
     argc, argv,
     "taler-exchange-kyc-trigger",
     gettext_noop (
       "Trigger KYC/AML measures based on high wallet balance for testing"),
     options,
     &run, NULL);
   if (GNUNET_SYSERR == ret)
     return EXIT_INVALIDARGUMENT;
   if (GNUNET_NO == ret)
     return EXIT_SUCCESS;
   return global_ret;
 }
 
 
 /* end of taler-exchange-kyc-trigger.c */