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/*
This file is part of TALER
Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_json_lib.h
* @brief helper functions for JSON processing using libjansson
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#ifndef TALER_json_LIB_H_
#define TALER_json_LIB_H_
#include <jansson.h>
/**
* Print JSON parsing related error information
*/
#define TALER_json_warn(error) \
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, \
"JSON parsing failed at %s:%u: %s (%s)\n", \
__FILE__, __LINE__, error.text, error.source)
/**
* Convert a TALER amount to a JSON object.
*
* @param amount the amount
* @return a json object describing the amount
*/
json_t *
TALER_json_from_amount (const struct TALER_Amount *amount);
/**
* Convert absolute timestamp to a json string.
*
* @param stamp the time stamp
* @return a json string with the timestamp in @a stamp
*/
json_t *
TALER_json_from_abs (struct GNUNET_TIME_Absolute stamp);
/**
* Convert a signature (with purpose) to a JSON object representation.
*
* @param purpose purpose of the signature
* @param signature the signature
* @return the JSON reporesentation of the signature with purpose
*/
json_t *
TALER_json_from_eddsa_sig (const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
const struct GNUNET_CRYPTO_EddsaSignature *signature);
/**
* Convert RSA public key to JSON.
*
* @param pk public key to convert
* @return corresponding JSON encoding
*/
json_t *
TALER_json_from_rsa_public_key (struct GNUNET_CRYPTO_rsa_PublicKey *pk);
/**
* Convert RSA signature to JSON.
*
* @param sig signature to convert
* @return corresponding JSON encoding
*/
json_t *
TALER_json_from_rsa_signature (struct GNUNET_CRYPTO_rsa_Signature *sig);
/**
* Convert binary data to a JSON string
* with the base32crockford encoding.
*
* @param data binary data
* @param size size of @a data in bytes
* @return json string that encodes @a data
*/
json_t *
TALER_json_from_data (const void *data, size_t size);
/**
* Parse given JSON object to Amount
*
* @param json the json object representing Amount
* @param[out] r_amount where the amount has to be written
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_json_to_amount (json_t *json,
struct TALER_Amount *r_amount);
/**
* Parse given JSON object to absolute time.
*
* @param json the json object representing absolute time in seconds
* @param[out] abs where the time has to be written
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_json_to_abs (json_t *json,
struct GNUNET_TIME_Absolute *abs);
/**
* Parse given JSON object to data
*
* @param json the json object representing data
* @param out the pointer to hold the parsed data.
* @param out_size the size of @a out
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_json_to_data (json_t *json,
void *out,
size_t out_size);
/**
* Convert JSON to RSA public key.
*
* @param json JSON encoding to convert
* @return corresponding public key
*/
struct GNUNET_CRYPTO_rsa_PublicKey *
TALER_json_to_rsa_public_key (json_t *json);
/**
* Convert JSON to RSA signature.
*
* @param json JSON encoding to convert
* @return corresponding signature
*/
struct GNUNET_CRYPTO_rsa_Signature *
TALER_json_to_rsa_signature (json_t *json);
/**
* Hash a JSON for binary signing.
*
* @param[in] json some JSON value to hash
* @param[out] hc resulting hash code
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_hash_json (json_t *json,
struct GNUNET_HashCode *hc);
/**
* Check if the given wire format JSON object is correctly formatted
*
* @param type the type of the wire format
* @param wire the JSON wire format object
* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
*/
int
TALER_json_validate_wireformat (const char *type,
const json_t *wire);
#endif /* TALER_json_LIB_H_ */
/* End of taler_json_lib.h */
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