merchant

Merchant backend to process payments, run by merchants
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taler-merchant-httpd_get-products-IMAGE_HASH-image.c (3407B)

      1 /*
      2   This file is part of TALER
      3   Copyright (C) 2025 Taler Systems SA
      4 
      5   TALER is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU Affero General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
     12 
     13   You should have received a copy of the GNU Affero General Public License along with
     14   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15 */
     16 /**
     17  * @file src/backend/taler-merchant-httpd_get-products-IMAGE_HASH-image.c
     18  * @brief implement GET /products/$HASH/image
     19  * @author Bohdan Potuzhnyi
     20  */
     21 #include "platform.h"
     22 #include "taler-merchant-httpd_get-products-IMAGE_HASH-image.h"
     23 #include "taler-merchant-httpd_helper.h"
     24 #include <taler/taler_error_codes.h>
     25 #include "merchant-database/lookup_product_image.h"
     26 
     27 
     28 enum MHD_Result
     29 TMH_get_products_image (const struct TMH_RequestHandler *rh,
     30                         struct MHD_Connection *connection,
     31                         struct TMH_HandlerContext *hc)
     32 {
     33   struct TMH_MerchantInstance *mi = hc->instance;
     34   const char *image_hash = hc->infix;
     35   char *image = NULL;
     36   enum GNUNET_DB_QueryStatus qs;
     37   (void) rh;
     38 
     39   {
     40     /* Just simple check if the string is what we really expect */
     41     size_t ih_len = strlen (image_hash);
     42 
     43     if ( (sizeof (struct GNUNET_ShortHashCode) * 2) != ih_len)
     44       return TALER_MHD_reply_with_error (connection,
     45                                          MHD_HTTP_BAD_REQUEST,
     46                                          TALER_EC_GENERIC_PARAMETER_MALFORMED,
     47                                          "image_hash");
     48 
     49     for (size_t i = 0; i < ih_len; i++)
     50       if (! isxdigit ((unsigned char) image_hash[i]))
     51         return TALER_MHD_reply_with_error (connection,
     52                                            MHD_HTTP_BAD_REQUEST,
     53                                            TALER_EC_GENERIC_PARAMETER_MALFORMED,
     54                                            "image_hash");
     55   }
     56 
     57   qs = TALER_MERCHANTDB_lookup_product_image_by_hash (TMH_db,
     58                                                       mi->settings.id,
     59                                                       image_hash,
     60                                                       &image);
     61   if (0 > qs)
     62   {
     63     GNUNET_break (0);
     64     return TALER_MHD_reply_with_error (connection,
     65                                        MHD_HTTP_INTERNAL_SERVER_ERROR,
     66                                        TALER_EC_GENERIC_DB_FETCH_FAILED,
     67                                        "lookup_product_image_by_hash");
     68   }
     69   if ( (0 == qs) ||
     70        (NULL == image) )
     71   {
     72     return TALER_MHD_reply_with_error (connection,
     73                                        MHD_HTTP_NOT_FOUND,
     74                                        TALER_EC_MERCHANT_GENERIC_PRODUCT_UNKNOWN,
     75                                        image_hash);
     76   }
     77 
     78   {
     79     enum MHD_Result ret;
     80 
     81     ret = TALER_MHD_REPLY_JSON_PACK (connection,
     82                                      MHD_HTTP_OK,
     83                                      GNUNET_JSON_pack_string ("image",
     84                                                               image));
     85     GNUNET_free (image);
     86     return ret;
     87   }
     88 }