119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015, 2016 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file json/json.c
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* @brief helper functions for JSON processing using libjansson
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* @author Sree Harsha Totakura <sreeharsha@totakura.in>
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include "taler_util.h"
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#include "taler_json_lib.h"
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/**
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* Hash a JSON object for binary signing.
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*
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* See https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme-15
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* for fun JSON canonicalization problems. Callers must ensure that
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* those are avoided in the input. We will use libjanson's "JSON_COMPACT"
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* encoding for whitespace and "JSON_SORT_KEYS" to canonicalize as best
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* as we can.
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*
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* @param[in] json some JSON value
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* @param[out] hc resulting hash code
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* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
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*/
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int
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TALER_JSON_hash (const json_t *json,
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struct GNUNET_HashCode *hc)
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{
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char *wire_enc;
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size_t len;
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if (NULL == (wire_enc = json_dumps (json,
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JSON_COMPACT | JSON_SORT_KEYS)))
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{
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GNUNET_break (0);
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return GNUNET_SYSERR;
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}
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len = strlen (wire_enc) + 1;
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GNUNET_CRYPTO_hash (wire_enc,
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len,
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hc);
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free (wire_enc);
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return GNUNET_OK;
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}
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/**
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* Extract the Taler error code from the given @a json object.
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* Note that #TALER_EC_NONE is returned if no "code" is present.
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*
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* @param json response to extract the error code from
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* @return the "code" value from @a json
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*/
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enum TALER_ErrorCode
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TALER_JSON_get_error_code (const json_t *json)
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{
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const json_t *jc;
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if (NULL == json)
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{
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GNUNET_break_op (0);
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return TALER_EC_INVALID_RESPONSE;
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}
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jc = json_object_get (json, "code");
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if (NULL == jc)
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return TALER_EC_NONE;
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if (json_is_integer (jc))
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return (enum TALER_ErrorCode) json_integer_value (jc);
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GNUNET_break_op (0);
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return TALER_EC_INVALID;
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}
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/**
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* Extract the Taler error code from the given @a data object, which is expected to be in JSON.
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* Note that #TALER_EC_INVALID is returned if no "code" is present or if @a data is not in JSON.
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*
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* @param data response to extract the error code from
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* @param data_size number of bytes in @a data
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* @return the "code" value from @a json
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*/
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enum TALER_ErrorCode
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TALER_JSON_get_error_code2 (const void *data,
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size_t data_size)
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{
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json_t *json;
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enum TALER_ErrorCode ec;
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json_error_t err;
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json = json_loads (data,
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data_size,
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&err);
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if (NULL == json)
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return TALER_EC_INVALID;
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ec = TALER_JSON_get_error_code (json);
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json_decref (json);
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if (ec == TALER_EC_NONE)
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return TALER_EC_INVALID;
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return ec;
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}
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/* End of json/json.c */
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