merchant

merchant_api_post-private-products-PRODUCT_ID-lock.c (9028B)

---

 /*
   This file is part of TALER
   Copyright (C) 2020-2026 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-private-products-PRODUCT_ID-lock-new.c
  * @brief Implementation of the POST /private/products/$PRODUCT_ID/lock request
  * @author Christian Grothoff
  */
 #include "taler/platform.h"
 #include <curl/curl.h>
 #include <jansson.h>
 #include <microhttpd.h> /* just for HTTP status codes */
 #include <gnunet/gnunet_util_lib.h>
 #include <gnunet/gnunet_curl_lib.h>
 #include <taler/taler-merchant/post-private-products-PRODUCT_ID-lock.h>
 #include "merchant_api_curl_defaults.h"
 #include "merchant_api_common.h"
 #include <taler/taler_json_lib.h>
 #include <taler/taler_curl_lib.h>
 
 
 /**
  * Handle for a POST /private/products/$PRODUCT_ID/lock operation.
  */
 struct TALER_MERCHANT_PostPrivateProductsLockHandle
 {
   /**
    * Base URL of the merchant backend.
    */
   char *base_url;
 
   /**
    * The full URL for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_PostPrivateProductsLockCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_MERCHANT_POST_PRIVATE_PRODUCTS_LOCK_RESULT_CLOSURE *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;
 
   /**
    * Product identifier.
    */
   char *product_id;
 
   /**
    * Lock UUID.
    */
   char *uuid;
 
   /**
    * How long to lock the inventory.
    */
   struct GNUNET_TIME_Relative duration;
 
   /**
    * Number of units to lock.
    */
   uint64_t quantity;
 
   /**
    * Fractional part of the quantity.
    */
   uint32_t quantity_frac;
 
   /**
    * Whether to use fractional quantity.
    */
   bool use_fractional_quantity;
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /private/products/$PRODUCT_ID/lock request.
  *
  * @param cls the `struct TALER_MERCHANT_PostPrivateProductsLockHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_post_products_lock_finished (void *cls,
                                     long response_code,
                                     const void *response)
 {
   struct TALER_MERCHANT_PostPrivateProductsLockHandle *pplh = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_PostPrivateProductsLockResponse plr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pplh->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "POST /private/products/$PRODUCT_ID/lock completed with response code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case 0:
     plr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_UNAUTHORIZED:
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_BAD_REQUEST:
     GNUNET_break_op (0);
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_FORBIDDEN:
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_NOT_FOUND:
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_GONE:
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     plr.hr.ec = TALER_JSON_get_error_code (json);
     plr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     TALER_MERCHANT_parse_error_details_ (json,
                                          response_code,
                                          &plr.hr);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) response_code,
                 (int) plr.hr.ec);
     GNUNET_break_op (0);
     break;
   }
   pplh->cb (pplh->cb_cls,
             &plr);
   TALER_MERCHANT_post_private_products_lock_cancel (pplh);
 }
 
 
 struct TALER_MERCHANT_PostPrivateProductsLockHandle *
 TALER_MERCHANT_post_private_products_lock_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const char *product_id,
   const char *uuid,
   struct GNUNET_TIME_Relative duration,
   uint64_t quantity)
 {
   struct TALER_MERCHANT_PostPrivateProductsLockHandle *pplh;
 
   pplh = GNUNET_new (struct TALER_MERCHANT_PostPrivateProductsLockHandle);
   pplh->ctx = ctx;
   pplh->base_url = GNUNET_strdup (url);
   pplh->product_id = GNUNET_strdup (product_id);
   pplh->uuid = GNUNET_strdup (uuid);
   pplh->duration = duration;
   pplh->quantity = quantity;
   return pplh;
 }
 
 
 enum GNUNET_GenericReturnValue
 TALER_MERCHANT_post_private_products_lock_set_options_ (
   struct TALER_MERCHANT_PostPrivateProductsLockHandle *pplh,
   unsigned int num_options,
   const struct TALER_MERCHANT_PostPrivateProductsLockOptionValue *options)
 {
   for (unsigned int i = 0; i < num_options; i++)
   {
     switch (options[i].option)
     {
     case TALER_MERCHANT_POST_PRIVATE_PRODUCTS_LOCK_OPTION_END:
       return GNUNET_OK;
     case TALER_MERCHANT_POST_PRIVATE_PRODUCTS_LOCK_OPTION_QUANTITY_FRAC:
       pplh->quantity_frac = options[i].details.quantity_frac;
       break;
     case
       TALER_MERCHANT_POST_PRIVATE_PRODUCTS_LOCK_OPTION_USE_FRACTIONAL_QUANTITY:
       pplh->use_fractional_quantity
         = options[i].details.use_fractional_quantity;
       break;
     default:
       GNUNET_break (0);
       return GNUNET_SYSERR;
     }
   }
   return GNUNET_OK;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_post_private_products_lock_start (
   struct TALER_MERCHANT_PostPrivateProductsLockHandle *pplh,
   TALER_MERCHANT_PostPrivateProductsLockCallback cb,
   TALER_MERCHANT_POST_PRIVATE_PRODUCTS_LOCK_RESULT_CLOSURE *cb_cls)
 {
   json_t *req_obj;
   CURL *eh;
   char unit_quantity_buf[64];
 
   pplh->cb = cb;
   pplh->cb_cls = cb_cls;
   {
     char *path;
 
     GNUNET_asprintf (&path,
                      "private/products/%s/lock",
                      pplh->product_id);
     pplh->url = TALER_url_join (pplh->base_url,
                                 path,
                                 NULL);
     GNUNET_free (path);
   }
   if (NULL == pplh->url)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   GNUNET_assert ( (0 == pplh->quantity_frac) ||
                   pplh->use_fractional_quantity);
   TALER_MERCHANT_format_quantity_string (pplh->quantity,
                                          pplh->quantity_frac,
                                          unit_quantity_buf,
                                          sizeof (unit_quantity_buf));
   req_obj = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_string ("lock_uuid",
                              pplh->uuid),
     GNUNET_JSON_pack_time_rel ("duration",
                                pplh->duration),
     GNUNET_JSON_pack_string ("unit_quantity",
                              unit_quantity_buf));
   eh = TALER_MERCHANT_curl_easy_get_ (pplh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&pplh->post_ctx,
                               eh,
                               req_obj)) )
   {
     GNUNET_break (0);
     json_decref (req_obj);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (req_obj);
   pplh->job = GNUNET_CURL_job_add2 (pplh->ctx,
                                     eh,
                                     pplh->post_ctx.headers,
                                     &handle_post_products_lock_finished,
                                     pplh);
   if (NULL == pplh->job)
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_MERCHANT_post_private_products_lock_cancel (
   struct TALER_MERCHANT_PostPrivateProductsLockHandle *pplh)
 {
   if (NULL != pplh->job)
   {
     GNUNET_CURL_job_cancel (pplh->job);
     pplh->job = NULL;
   }
   TALER_curl_easy_post_finished (&pplh->post_ctx);
   GNUNET_free (pplh->product_id);
   GNUNET_free (pplh->uuid);
   GNUNET_free (pplh->url);
   GNUNET_free (pplh->base_url);
   GNUNET_free (pplh);
 }
 
 
 /* end of merchant_api_post-private-products-PRODUCT_ID-lock-new.c */