exchange

exchange_api_post-kyc-start-ID.c (6818B)

---

 /*
   This file is part of TALER
   Copyright (C) 2024-2026 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-kyc-start-ID.c
  * @brief functions to start a KYC process
  * @author Christian Grothoff
  */
 #include "taler/taler_json_lib.h"
 #include <microhttpd.h>
 #include <gnunet/gnunet_curl_lib.h>
 #include "taler/exchange/post-kyc-start-ID.h"
 #include "exchange_api_curl_defaults.h"
 #include "taler/taler_signatures.h"
 #include "taler/taler_curl_lib.h"
 
 
 struct TALER_EXCHANGE_PostKycStartHandle
 {
 
   /**
    * The base URL for this request.
    */
   char *base_url;
 
   /**
    * The full 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_PostKycStartCallback cb;
 
   /**
    * Closure for @e cb.
    */
   TALER_EXCHANGE_POST_KYC_START_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Identifier for the KYC process to start.
    */
   char *id;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /kyc-start/$ID request.
  *
  * @param cls the `struct TALER_EXCHANGE_PostKycStartHandle *`
  * @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_PostKycStartHandle *pksh = cls;
   const json_t *json = response;
   struct TALER_EXCHANGE_PostKycStartResponse adr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pksh->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_BAD_REQUEST:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_NOT_FOUND:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_CONFLICT:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     adr.hr.ec = TALER_JSON_get_error_code (json);
     adr.hr.hint = TALER_JSON_get_error_hint (json);
     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 POST kyc-start\n",
                 (unsigned int) response_code,
                 (int) adr.hr.ec);
     break;
   }
   if (NULL != pksh->cb)
   {
     pksh->cb (pksh->cb_cls,
               &adr);
     pksh->cb = NULL;
   }
   TALER_EXCHANGE_post_kyc_start_cancel (pksh);
 }
 
 
 struct TALER_EXCHANGE_PostKycStartHandle *
 TALER_EXCHANGE_post_kyc_start_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const char *id)
 {
   struct TALER_EXCHANGE_PostKycStartHandle *pksh;
 
   pksh = GNUNET_new (struct TALER_EXCHANGE_PostKycStartHandle);
   pksh->ctx = ctx;
   pksh->base_url = GNUNET_strdup (url);
   pksh->id = GNUNET_strdup (id);
   return pksh;
 }
 
 
 enum TALER_ErrorCode
 TALER_EXCHANGE_post_kyc_start_start (
   struct TALER_EXCHANGE_PostKycStartHandle *pksh,
   TALER_EXCHANGE_PostKycStartCallback cb,
   TALER_EXCHANGE_POST_KYC_START_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   json_t *body;
   char *path;
 
   pksh->cb = cb;
   pksh->cb_cls = cb_cls;
   GNUNET_asprintf (&path,
                    "kyc-start/%s",
                    pksh->id);
   pksh->url = TALER_url_join (pksh->base_url,
                               path,
                               NULL);
   GNUNET_free (path);
   if (NULL == pksh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   }
   body = json_object (); /* as per spec: empty! */
   GNUNET_assert (NULL != body);
   eh = TALER_EXCHANGE_curl_easy_get_ (pksh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pksh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (pksh->url);
     pksh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (body);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pksh->url);
   pksh->job = GNUNET_CURL_job_add2 (pksh->ctx,
                                     eh,
                                     pksh->post_ctx.headers,
                                     &handle_kyc_start_finished,
                                     pksh);
   if (NULL == pksh->job)
   {
     TALER_curl_easy_post_finished (&pksh->post_ctx);
     GNUNET_free (pksh->url);
     pksh->url = NULL;
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_EXCHANGE_post_kyc_start_cancel (
   struct TALER_EXCHANGE_PostKycStartHandle *pksh)
 {
   if (NULL != pksh->job)
   {
     GNUNET_CURL_job_cancel (pksh->job);
     pksh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pksh->post_ctx);
   GNUNET_free (pksh->url);
   GNUNET_free (pksh->base_url);
   GNUNET_free (pksh->id);
   GNUNET_free (pksh);
 }
 
 
 /* end of exchange_api_post-kyc-start-ID.c */