merchant

merchant_api_get-products-IMAGE_HASH-image.c (5833B)

---

 /*
   This file is part of TALER
   Copyright (C) 2025-2026 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_get-products-IMAGE_HASH-image-new.c
  * @brief Implementation of the GET /products/$IMAGE_HASH/image 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/get-products-IMAGE_HASH-image.h>
 #include "merchant_api_curl_defaults.h"
 #include <taler/taler_json_lib.h>
 
 
 /**
  * Handle for a GET /products/$IMAGE_HASH/image operation.
  */
 struct TALER_MERCHANT_GetProductsImageHandle
 {
   /**
    * 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_GetProductsImageCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_MERCHANT_GET_PRODUCTS_IMAGE_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Image hash identifier.
    */
   char *image_hash;
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP GET /products/$IMAGE_HASH/image request.
  *
  * @param cls the `struct TALER_MERCHANT_GetProductsImageHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_get_product_image_finished (void *cls,
                                    long response_code,
                                    const void *response)
 {
   struct TALER_MERCHANT_GetProductsImageHandle *gpi = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_GetProductsImageResponse pgr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   gpi->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Got /products/$IMAGE_HASH/image response with status code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case MHD_HTTP_OK:
     {
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_string ("image",
                                  &pgr.details.ok.image),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK ==
           GNUNET_JSON_parse (json,
                              spec,
                              NULL, NULL))
       {
         gpi->cb (gpi->cb_cls,
                  &pgr);
         GNUNET_JSON_parse_free (spec);
         TALER_MERCHANT_get_products_image_cancel (gpi);
         return;
       }
       pgr.hr.http_status = 0;
       pgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
       break;
     }
   case MHD_HTTP_NOT_FOUND:
   case MHD_HTTP_BAD_REQUEST:
     pgr.hr.ec = TALER_JSON_get_error_code (json);
     pgr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     pgr.hr.ec = TALER_JSON_get_error_code (json);
     pgr.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) pgr.hr.ec);
     break;
   }
   gpi->cb (gpi->cb_cls,
            &pgr);
   TALER_MERCHANT_get_products_image_cancel (gpi);
 }
 
 
 struct TALER_MERCHANT_GetProductsImageHandle *
 TALER_MERCHANT_get_products_image_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const char *image_hash)
 {
   struct TALER_MERCHANT_GetProductsImageHandle *gpi;
 
   gpi = GNUNET_new (struct TALER_MERCHANT_GetProductsImageHandle);
   gpi->ctx = ctx;
   gpi->base_url = GNUNET_strdup (url);
   gpi->image_hash = GNUNET_strdup (image_hash);
   return gpi;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_get_products_image_start (
   struct TALER_MERCHANT_GetProductsImageHandle *gpi,
   TALER_MERCHANT_GetProductsImageCallback cb,
   TALER_MERCHANT_GET_PRODUCTS_IMAGE_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
 
   gpi->cb = cb;
   gpi->cb_cls = cb_cls;
   {
     char *path;
 
     GNUNET_asprintf (&path,
                      "products/%s/image",
                      gpi->image_hash);
     gpi->url = TALER_url_join (gpi->base_url,
                                path,
                                NULL);
     GNUNET_free (path);
   }
   if (NULL == gpi->url)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   eh = TALER_MERCHANT_curl_easy_get_ (gpi->url);
   if (NULL == eh)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   gpi->job = GNUNET_CURL_job_add (gpi->ctx,
                                   eh,
                                   &handle_get_product_image_finished,
                                   gpi);
   if (NULL == gpi->job)
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_MERCHANT_get_products_image_cancel (
   struct TALER_MERCHANT_GetProductsImageHandle *gpi)
 {
   if (NULL != gpi->job)
   {
     GNUNET_CURL_job_cancel (gpi->job);
     gpi->job = NULL;
   }
   GNUNET_free (gpi->url);
   GNUNET_free (gpi->base_url);
   GNUNET_free (gpi->image_hash);
   GNUNET_free (gpi);
 }
 
 
 /* end of merchant_api_get-products-IMAGE_HASH-image-new.c */