exchange

exchange_api_kyc_start.c (5475B)

---

 /*
   This file is part of TALER
   Copyright (C) 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 lib/exchange_api_kyc_start.c
  * @brief functions to start a KYC process
  * @author Christian Grothoff
  */
 #include "taler/platform.h"
 #include "taler/taler_json_lib.h"
 #include <microhttpd.h>
 #include <gnunet/gnunet_curl_lib.h>
 #include "taler/taler_exchange_service.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 #include "taler/taler_json_lib.h"
 
 
 struct TALER_EXCHANGE_KycStartHandle
 {
 
   /**
    * The url for this request.
    */
   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_KycStartCallback cb;
 
   /**
    * Closure for @a cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /kyc-start/$ID request.
  *
  * @param cls the `struct TALER_EXCHANGE_KycStartHandle *`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_kyc_start_finished (void *cls,
                            long response_code,
                            const void *response)
 {
   struct TALER_EXCHANGE_KycStartHandle *wh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_KycStartResponse adr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   wh->job = NULL;
   switch (response_code)
   {
   case 0:
     /* no reply */
     adr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     adr.hr.hint = "server offline?";
     break;
   case MHD_HTTP_OK:
     {
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_string (
           "redirect_url",
           &adr.details.ok.redirect_url),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (json,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         adr.hr.http_status = 0;
         adr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
         break;
       }
     }
     break;
   case MHD_HTTP_NOT_FOUND:
     break;
   default:
     /* unexpected response code */
     GNUNET_break_op (0);
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d for exchange AML decision\n",
                 (unsigned int) response_code,
                 (int) adr.hr.ec);
     break;
   }
   if (NULL != wh->cb)
   {
     wh->cb (wh->cb_cls,
             &adr);
     wh->cb = NULL;
   }
   TALER_EXCHANGE_kyc_start_cancel (wh);
 }
 
 
 struct TALER_EXCHANGE_KycStartHandle *
 TALER_EXCHANGE_kyc_start (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const char *id,
   TALER_EXCHANGE_KycStartCallback cb,
   void *cb_cls)
 {
   struct TALER_EXCHANGE_KycStartHandle *wh;
   CURL *eh;
   json_t *body;
 
   wh = GNUNET_new (struct TALER_EXCHANGE_KycStartHandle);
   wh->cb = cb;
   wh->cb_cls = cb_cls;
   wh->ctx = ctx;
   {
     char *path;
 
     GNUNET_asprintf (&path,
                      "kyc-start/%s",
                      id);
     wh->url = TALER_url_join (url,
                               path,
                               NULL);
     GNUNET_free (path);
   }
   if (NULL == wh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (wh);
     return NULL;
   }
   body = json_object (); /* as per spec: empty! */
   GNUNET_assert (NULL != body);
   eh = TALER_EXCHANGE_curl_easy_get_ (wh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&wh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (wh->url);
     return NULL;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               wh->url);
   wh->job = GNUNET_CURL_job_add2 (ctx,
                                   eh,
                                   wh->post_ctx.headers,
                                   &handle_kyc_start_finished,
                                   wh);
   if (NULL == wh->job)
   {
     TALER_EXCHANGE_kyc_start_cancel (wh);
     return NULL;
   }
   return wh;
 }
 
 
 void
 TALER_EXCHANGE_kyc_start_cancel (
   struct TALER_EXCHANGE_KycStartHandle *wh)
 {
   if (NULL != wh->job)
   {
     GNUNET_CURL_job_cancel (wh->job);
     wh->job = NULL;
   }
   TALER_curl_easy_post_finished (&wh->post_ctx);
   GNUNET_free (wh->url);
   GNUNET_free (wh);
 }