Line data    Source code

       1             : /*
       2             :   This file is part of TALER
       3             :   (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 Lesser 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 General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU General Public License along with
      14             :   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
      15             : */
      16             : /**
      17             :  * @file util/json.c
      18             :  * @brief helper functions to parse JSON
      19             :  * @author Christian Grothoff
      20             :  */
      21             : #include "platform.h"
      22             : #include <gnunet/gnunet_common.h>
      23             : #include <gnunet/gnunet_json_lib.h>
      24             : #include <jansson.h>
      25             : #include <taler/taler_json_lib.h>
      26             : #include <taler/taler_util.h>
      27             : #include "taler_merchant_util.h"
      28             : 
      29             : 
      30             : /**
      31             :  * Parse given JSON object to `enum TALER_MERCHANT_ContractInputType`
      32             :  *
      33             :  * @param cls closure, NULL
      34             :  * @param root the json object representing data
      35             :  * @param[out] spec where to write the data
      36             :  * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
      37             :  */
      38             : static enum GNUNET_GenericReturnValue
      39          15 : parse_contract_input_type (void *cls,
      40             :                            json_t *root,
      41             :                            struct GNUNET_JSON_Specification *spec)
      42             : {
      43             :   static const struct Entry
      44             :   {
      45             :     const char *name;
      46             :     enum TALER_MERCHANT_ContractInputType val;
      47             :   } lt [] = {
      48             : #if FUTURE
      49             :     { .name = "coin",
      50             :       .val = TALER_MERCHANT_CONTRACT_INPUT_TYPE_COIN },
      51             : #endif
      52             :     { .name = "token",
      53             :       .val = TALER_MERCHANT_CONTRACT_INPUT_TYPE_TOKEN },
      54             :     { .name = NULL,
      55             :       .val = TALER_MERCHANT_CONTRACT_INPUT_TYPE_INVALID }
      56             :   };
      57          15 :   enum TALER_MERCHANT_ContractInputType *res
      58             :     = (enum TALER_MERCHANT_ContractInputType *) spec->ptr;
      59             : 
      60             :   (void) cls;
      61          15 :   if (json_is_string (root))
      62             :   {
      63             :     const char *str;
      64             : 
      65          15 :     str = json_string_value (root);
      66          15 :     if (NULL == str)
      67             :     {
      68           0 :       GNUNET_break_op (0);
      69           0 :       return GNUNET_SYSERR;
      70             :     }
      71          15 :     for (unsigned int i = 0; NULL != lt[i].name; i++)
      72             :     {
      73          15 :       if (0 == strcasecmp (str,
      74          15 :                            lt[i].name))
      75             :       {
      76          15 :         *res = lt[i].val;
      77          15 :         return GNUNET_OK;
      78             :       }
      79             :     }
      80             :   }
      81           0 :   GNUNET_break_op (0);
      82           0 :   return GNUNET_SYSERR;
      83             : }
      84             : 
      85             : 
      86             : struct GNUNET_JSON_Specification
      87          15 : TALER_MERCHANT_json_spec_cit (const char *name,
      88             :                               enum TALER_MERCHANT_ContractInputType *cit)
      89             : {
      90          15 :   struct GNUNET_JSON_Specification ret = {
      91             :     .parser = &parse_contract_input_type,
      92             :     .field = name,
      93             :     .ptr = cit
      94             :   };
      95             : 
      96          15 :   *cit = TALER_MERCHANT_CONTRACT_INPUT_TYPE_INVALID;
      97          15 :   return ret;
      98             : }
      99             : 
     100             : 
     101             : /**
     102             :  * Parse given JSON object to `enum TALER_MERCHANT_ContractOutputType`
     103             :  *
     104             :  * @param cls closure, NULL
     105             :  * @param root the json object representing data
     106             :  * @param[out] spec where to write the data
     107             :  * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
     108             :  */
     109             : static enum GNUNET_GenericReturnValue
     110          16 : parse_contract_output_type (void *cls,
     111             :                             json_t *root,
     112             :                             struct GNUNET_JSON_Specification *spec)
     113             : {
     114             :   static const struct Entry
     115             :   {
     116             :     const char *name;
     117             :     enum TALER_MERCHANT_ContractOutputType val;
     118             :   } lt [] = {
     119             :     { .name = "token",
     120             :       .val = TALER_MERCHANT_CONTRACT_OUTPUT_TYPE_TOKEN },
     121             :     { .name = "tax-receipt",
     122             :       .val = TALER_MERCHANT_CONTRACT_OUTPUT_TYPE_DONATION_RECEIPT },
     123             : #if FUTURE
     124             :     { .name = "coin",
     125             :       .val = TALER_MERCHANT_CONTRACT_OUTPUT_TYPE_COIN },
     126             : #endif
     127             :     { .name = NULL,
     128             :       .val = TALER_MERCHANT_CONTRACT_OUTPUT_TYPE_INVALID }
     129             :   };
     130          16 :   enum TALER_MERCHANT_ContractOutputType *res
     131             :     = (enum TALER_MERCHANT_ContractOutputType *) spec->ptr;
     132             : 
     133             :   (void) cls;
     134          16 :   if (json_is_string (root))
     135             :   {
     136             :     const char *str;
     137             : 
     138          16 :     str = json_string_value (root);
     139          16 :     if (NULL == str)
     140             :     {
     141           0 :       GNUNET_break_op (0);
     142           0 :       return GNUNET_SYSERR;
     143             :     }
     144          17 :     for (unsigned int i = 0; NULL != lt[i].name; i++)
     145             :     {
     146          17 :       if (0 == strcasecmp (str,
     147          17 :                            lt[i].name))
     148             :       {
     149          16 :         *res = lt[i].val;
     150          16 :         return GNUNET_OK;
     151             :       }
     152             :     }
     153             :   }
     154           0 :   GNUNET_break_op (0);
     155           0 :   return GNUNET_SYSERR;
     156             : }
     157             : 
     158             : 
     159             : struct GNUNET_JSON_Specification
     160          16 : TALER_MERCHANT_json_spec_cot (const char *name,
     161             :                               enum TALER_MERCHANT_ContractOutputType *cot)
     162             : {
     163          16 :   struct GNUNET_JSON_Specification ret = {
     164             :     .parser = &parse_contract_output_type,
     165             :     .field = name,
     166             :     .ptr = cot
     167             :   };
     168             : 
     169          16 :   *cot = TALER_MERCHANT_CONTRACT_OUTPUT_TYPE_INVALID;
     170          16 :   return ret;
     171             : }