merchant

merchant_api_post_transfers.c (7673B)

---

 /*
   This file is part of TALER
   Copyright (C) 2014-2023 Taler Systems SA
 
   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU Lesser General Public License as published by the Free Software
   Foundation; either version 2.1, 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 Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public License along with
   TALER; see the file COPYING.LGPL.  If not, see
   <http://www.gnu.org/licenses/>
 */
 /**
  * @file merchant_api_post_transfers.c
  * @brief Implementation of the POST /transfers request of the merchant's HTTP API
  * @author Marcello Stanisci
  * @author Christian Grothoff
  */
 #include "platform.h"
 #include <curl/curl.h>
 #include <jansson.h>
 #include <microhttpd.h> /* just for HTTP status codes */
 #include <gnunet/gnunet_util_lib.h>
 #include "taler_merchant_service.h"
 #include "merchant_api_curl_defaults.h"
 #include "merchant_api_common.h"
 #include <taler/taler_curl_lib.h>
 #include <taler/taler_json_lib.h>
 
 
 /**
  * @brief A handle for POSTing transfer data.
  */
 struct TALER_MERCHANT_PostTransfersHandle
 {
 
   /**
    * The url for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_PostTransfersCallback cb;
 
   /**
    * Closure for @a cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /transfers request.
  *
  * @param cls the `struct TALER_MERCHANT_PostTransfersHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_post_transfers_finished (void *cls,
                                 long response_code,
                                 const void *response)
 {
   struct TALER_MERCHANT_PostTransfersHandle *pth = cls;
   struct TALER_MERCHANT_PostTransfersResponse ptr = {
     .hr.reply = response,
     .hr.http_status = (unsigned int) response_code
   };
 
   pth->job = NULL;
   switch (response_code)
   {
   case 0:
     ptr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_UNAUTHORIZED:
     ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
     ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
     /* Nothing really to verify, merchant says we need to authenticate. */
     break;
   case MHD_HTTP_NOT_FOUND:
     /* Nothing really to verify, this should never
        happen, we should pass the JSON reply to the application */
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Did not find any data\n");
     ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
     ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
     break;
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     /* Server had an internal issue; we should retry, but this API
        leaves this to the application */
     ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
     ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
     break;
   case MHD_HTTP_BAD_GATEWAY:
     /* Exchange had an issue; we should retry, but this API
        leaves this to the application */
     ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
     ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
     {
       uint32_t ehc;
       struct GNUNET_JSON_Specification ispec[] = {
         TALER_JSON_spec_ec ("exchange_code",
                             &ptr.details.bad_gateway.exchange_ec),
         GNUNET_JSON_spec_uint32 ("exchange_http_status",
                                  &ehc),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (ptr.hr.reply,
                              ispec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         ptr.details.bad_gateway.exchange_http_status = 0;
         ptr.details.bad_gateway.exchange_ec = TALER_EC_NONE;
         break;
       }
       else
       {
         ptr.details.bad_gateway.exchange_http_status
           = (unsigned int) ehc;
         GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                     "Exchange returned %u/%u\n",
                     (unsigned int) ptr.details.bad_gateway.exchange_ec,
                     (unsigned int) ehc);
       }
     }
     break;
   case MHD_HTTP_GATEWAY_TIMEOUT:
     /* Server had an internal issue; we should retry, but this API
        leaves this to the application */
     ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
     ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
     break;
   default:
     /* unexpected response code */
     GNUNET_break_op (0);
     TALER_MERCHANT_parse_error_details_ (ptr.hr.reply,
                                          response_code,
                                          &ptr.hr);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) ptr.hr.http_status,
                 (int) ptr.hr.ec);
     break;
   }
   pth->cb (pth->cb_cls,
            &ptr);
   TALER_MERCHANT_transfers_post_cancel (pth);
 }
 
 
 struct TALER_MERCHANT_PostTransfersHandle *
 TALER_MERCHANT_transfers_post (
   struct GNUNET_CURL_Context *ctx,
   const char *backend_url,
   const struct TALER_Amount *credit_amount,
   const struct TALER_WireTransferIdentifierRawP *wtid,
   struct TALER_FullPayto payto_uri,
   const char *exchange_url,
   TALER_MERCHANT_PostTransfersCallback cb,
   void *cb_cls)
 {
   struct TALER_MERCHANT_PostTransfersHandle *pth;
   CURL *eh;
   json_t *req;
 
   pth = GNUNET_new (struct TALER_MERCHANT_PostTransfersHandle);
   pth->ctx = ctx;
   pth->cb = cb;
   pth->cb_cls = cb_cls;
   pth->url = TALER_url_join (backend_url,
                              "private/transfers",
                              NULL);
   if (NULL == pth->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (pth);
     return NULL;
   }
   req = GNUNET_JSON_PACK (
     TALER_JSON_pack_amount ("credit_amount",
                             credit_amount),
     GNUNET_JSON_pack_data_auto ("wtid",
                                 wtid),
     TALER_JSON_pack_full_payto ("payto_uri",
                                 payto_uri),
     GNUNET_JSON_pack_string ("exchange_url",
                              exchange_url));
   eh = TALER_MERCHANT_curl_easy_get_ (pth->url);
   if (GNUNET_OK !=
       TALER_curl_easy_post (&pth->post_ctx,
                             eh,
                             req))
   {
     GNUNET_break (0);
     curl_easy_cleanup (eh);
     json_decref (req);
     GNUNET_free (pth->url);
     GNUNET_free (pth);
     return NULL;
   }
   json_decref (req);
   pth->job = GNUNET_CURL_job_add2 (ctx,
                                    eh,
                                    pth->post_ctx.headers,
                                    &handle_post_transfers_finished,
                                    pth);
   return pth;
 }
 
 
 void
 TALER_MERCHANT_transfers_post_cancel (
   struct TALER_MERCHANT_PostTransfersHandle *pth)
 {
   if (NULL != pth->job)
   {
     GNUNET_CURL_job_cancel (pth->job);
     pth->job = NULL;
   }
   GNUNET_free (pth->url);
   TALER_curl_easy_post_finished (&pth->post_ctx);
   GNUNET_free (pth);
 }
 
 
 /* end of merchant_api_post_transfers.c */