220 lines
6.3 KiB
C
220 lines
6.3 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015, 2016 GNUnet e.V.
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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 include/taler_json_lib.h
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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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* @author Christian Grothoff
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*/
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#ifndef TALER_JSON_LIB_H_
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#define TALER_JSON_LIB_H_
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#include <jansson.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_util.h"
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#include "taler_error_codes.h"
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/**
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* Print JSON parsing related error information
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* @deprecated
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*/
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#define TALER_json_warn(error) \
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GNUNET_log (GNUNET_ERROR_TYPE_WARNING, \
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"JSON parsing failed at %s:%u: %s (%s)\n", \
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__FILE__, __LINE__, error.text, error.source)
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/**
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* Convert a TALER amount to a JSON object.
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*
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* @param amount the amount
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* @return a json object describing the amount
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*/
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json_t *
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TALER_JSON_from_amount (const struct TALER_Amount *amount);
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/**
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* Convert a TALER amount to a JSON object.
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*
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* @param amount the amount
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* @return a json object describing the amount
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*/
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json_t *
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TALER_JSON_from_amount_nbo (const struct TALER_AmountNBO *amount);
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/**
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* Provide specification to parse given JSON object to an amount.
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*
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* @param name name of the amount field in the JSON
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* @param[out] r_amount where the amount has to be written
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*/
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_amount (const char *name,
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struct TALER_Amount *r_amount);
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/**
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* Provide specification to parse given JSON object to an amount
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* in network byte order.
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*
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* @param name name of the amount field in the JSON
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* @param[out] r_amount where the amount has to be written
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*/
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_amount_nbo (const char *name,
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struct TALER_AmountNBO *r_amount);
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/**
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* Generate line in parser specification for denomination public key.
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*
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* @param field name of the field
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* @param[out] pk key to initialize
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* @return corresponding field spec
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*/
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_denomination_public_key (const char *field,
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struct TALER_DenominationPublicKey *pk);
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/**
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* Generate line in parser specification for denomination signature.
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*
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* @param field name of the field
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* @param sig the signature to initialize
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* @return corresponding field spec
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*/
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_denomination_signature (const char *field,
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struct TALER_DenominationSignature *sig);
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/**
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* Hash a JSON for binary signing.
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*
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* @param[in] json some JSON value to hash
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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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* 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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* 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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/* **************** /wire account offline signing **************** */
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/**
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* Compute the hash of the given wire details. The resulting
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* hash is what is put into the contract.
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*
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* @param wire_s wire details to hash
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* @param hc[out] set to the hash
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* @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
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*/
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int
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TALER_JSON_merchant_wire_signature_hash (const json_t *wire_s,
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struct GNUNET_HashCode *hc);
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/**
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* Compute the hash of the given wire details. The resulting
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* hash is what is signed by the master public key.
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*
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* @param wire_s wire details to hash
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* @param hc[out] set to the hash
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* @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
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*/
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int
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TALER_JSON_exchange_wire_signature_hash (const json_t *wire_s,
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struct GNUNET_HashCode *hc);
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/**
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* Check the signature in @a wire_s.
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*
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* @param wire_s signed wire information of an exchange
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* @param master_pub master public key of the exchange
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* @return #GNUNET_OK if signature is valid
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*/
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int
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TALER_JSON_exchange_wire_signature_check (const json_t *wire_s,
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const struct
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TALER_MasterPublicKeyP *master_pub);
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/**
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* Create a signed wire statement for the given account.
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*
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* @param payto_url account specification
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* @param master_priv private key to sign with, NULL to not sign
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*/
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json_t *
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TALER_JSON_exchange_wire_signature_make (const char *payto_url,
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const struct
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TALER_MasterPrivateKeyP *master_priv);
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/**
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* Obtain the wire method associated with the given
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* wire account details. @a wire_s must contain a payto://-URL
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* under 'url'.
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*
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* @return NULL on error
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*/
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char *
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TALER_JSON_wire_to_method (const json_t *wire_s);
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/**
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* Obtain the payto://-URL associated with the given
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* wire account details. @a wire_s must contain a payto://-URL
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* under 'url'.
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*
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* @return NULL on error
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*/
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char *
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TALER_JSON_wire_to_payto (const json_t *wire_s);
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#endif /* TALER_JSON_LIB_H_ */
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/* End of taler_json_lib.h */
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