merchant

merchant_api_get_products.c (7052B)

---

 /*
   This file is part of TALER
   Copyright (C) 2014-2024 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_get_products.c
  * @brief Implementation of the GET /products request of the merchant's HTTP API
  * @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 <gnunet/gnunet_curl_lib.h>
 #include "taler_merchant_service.h"
 #include "merchant_api_curl_defaults.h"
 #include <taler/taler_json_lib.h>
 #include <taler/taler_signatures.h>
 
 
 /**
  * Maximum number of products we return.
  */
 #define MAX_PRODUCTS 1024
 
 
 /**
  * Handle for a GET /products operation.
  */
 struct TALER_MERCHANT_ProductsGetHandle
 {
   /**
    * The url for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_ProductsGetCallback cb;
 
   /**
    * Closure for @a cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
 };
 
 
 /**
  * Parse product information from @a ia.
  *
  * @param json overall JSON reply
  * @param ia JSON array (or NULL!) with product data
  * @param pgh operation handle
  * @return #GNUNET_OK on success
  */
 static enum GNUNET_GenericReturnValue
 parse_products (const json_t *json,
                 const json_t *ia,
                 struct TALER_MERCHANT_ProductsGetHandle *pgh)
 {
   unsigned int ies_len = json_array_size (ia);
 
   if ( (json_array_size (ia) != (size_t)  ies_len) ||
        (ies_len > MAX_PRODUCTS) )
   {
     GNUNET_break (0);
     return GNUNET_SYSERR;
   }
   {
     struct TALER_MERCHANT_InventoryEntry ies[GNUNET_NZL (ies_len)];
     size_t index;
     json_t *value;
     enum GNUNET_GenericReturnValue ret;
 
     ret = GNUNET_OK;
     json_array_foreach (ia, index, value) {
       struct TALER_MERCHANT_InventoryEntry *ie = &ies[index];
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_string ("product_id",
                                  &ie->product_id),
         GNUNET_JSON_spec_uint64 ("product_serial",
                                  &ie->product_serial),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (value,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         ret = GNUNET_SYSERR;
         continue;
       }
       if (GNUNET_SYSERR == ret)
         break;
     }
     if (GNUNET_OK == ret)
     {
       struct TALER_MERCHANT_GetProductsResponse gpr = {
         .hr.http_status = MHD_HTTP_OK,
         .hr.reply = json,
         .details.ok.products_length = ies_len,
         .details.ok.products = ies
       };
 
       pgh->cb (pgh->cb_cls,
                &gpr);
       pgh->cb = NULL; /* just to be sure */
     }
     return ret;
   }
 }
 
 
 /**
  * Function called when we're done processing the
  * HTTP /products request.
  *
  * @param cls the `struct TALER_MERCHANT_ProductsGetHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_get_products_finished (void *cls,
                               long response_code,
                               const void *response)
 {
   struct TALER_MERCHANT_ProductsGetHandle *pgh = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_GetProductsResponse gpr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   pgh->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Got /products response with status code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case MHD_HTTP_OK:
     {
       const json_t *products;
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_array_const ("products",
                                       &products),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (json,
                              spec,
                              NULL, NULL))
       {
         gpr.hr.http_status = 0;
         gpr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
         break;
       }
       if (GNUNET_OK ==
           parse_products (json,
                           products,
                           pgh))
       {
         TALER_MERCHANT_products_get_cancel (pgh);
         return;
       }
       gpr.hr.http_status = 0;
       gpr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
       break;
     }
   case MHD_HTTP_UNAUTHORIZED:
     gpr.hr.ec = TALER_JSON_get_error_code (json);
     gpr.hr.hint = TALER_JSON_get_error_hint (json);
     /* Nothing really to verify, merchant says we need to authenticate. */
     break;
   default:
     /* unexpected response code */
     gpr.hr.ec = TALER_JSON_get_error_code (json);
     gpr.hr.hint = TALER_JSON_get_error_hint (json);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) response_code,
                 (int) gpr.hr.ec);
     break;
   }
   pgh->cb (pgh->cb_cls,
            &gpr);
   TALER_MERCHANT_products_get_cancel (pgh);
 }
 
 
 struct TALER_MERCHANT_ProductsGetHandle *
 TALER_MERCHANT_products_get (
   struct GNUNET_CURL_Context *ctx,
   const char *backend_url,
   TALER_MERCHANT_ProductsGetCallback cb,
   void *cb_cls)
 {
   struct TALER_MERCHANT_ProductsGetHandle *pgh;
   CURL *eh;
 
   pgh = GNUNET_new (struct TALER_MERCHANT_ProductsGetHandle);
   pgh->ctx = ctx;
   pgh->cb = cb;
   pgh->cb_cls = cb_cls;
   pgh->url = TALER_url_join (backend_url,
                              "private/products",
                              NULL);
   if (NULL == pgh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (pgh);
     return NULL;
   }
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Requesting URL '%s'\n",
               pgh->url);
   eh = TALER_MERCHANT_curl_easy_get_ (pgh->url);
   pgh->job = GNUNET_CURL_job_add (ctx,
                                   eh,
                                   &handle_get_products_finished,
                                   pgh);
   return pgh;
 }
 
 
 void
 TALER_MERCHANT_products_get_cancel (
   struct TALER_MERCHANT_ProductsGetHandle *pgh)
 {
   if (NULL != pgh->job)
     GNUNET_CURL_job_cancel (pgh->job);
   GNUNET_free (pgh->url);
   GNUNET_free (pgh);
 }