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/*
This file is part of TALER
Copyright (C) 2014, 2015 GNUnet e.V.
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, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_util.h
* @brief Interface for common utility functions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#ifndef TALER_UTIL_H
#define TALER_UTIL_H
#include <gnunet/gnunet_util_lib.h>
#include <microhttpd.h>
#include "taler_amount_lib.h"
#include "taler_crypto_lib.h"
/* Define logging functions */
#define TALER_LOG_DEBUG(...) \
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
#define TALER_LOG_INFO(...) \
GNUNET_log (GNUNET_ERROR_TYPE_INFO, __VA_ARGS__)
#define TALER_LOG_WARNING(...) \
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, __VA_ARGS__)
#define TALER_LOG_ERROR(...) \
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, __VA_ARGS__)
/**
* Tests a given as assertion and if failed prints it as a warning with the
* given reason
*
* @param EXP the expression to test as assertion
* @param reason string to print as warning
*/
#define TALER_assert_as(EXP, reason) \
do { \
if (EXP) break; \
TALER_LOG_ERROR("%s at %s:%d\n", reason, __FILE__, __LINE__); \
abort(); \
} while(0)
/**
* Log an error message at log-level 'level' that indicates
* a failure of the command 'cmd' with the message given
* by gcry_strerror(rc).
*/
#define TALER_LOG_GCRY_ERROR(cmd, rc) do { TALER_LOG_ERROR("`%s' failed at %s:%d with error: %s\n", cmd, __FILE__, __LINE__, gcry_strerror(rc)); } while(0)
#define TALER_gcry_ok(cmd) \
do {int rc; rc = cmd; if (!rc) break; TALER_LOG_ERROR("A Gcrypt call failed at %s:%d with error: %s\n", __FILE__, __LINE__, gcry_strerror(rc)); abort(); } while (0)
/**
* Initialize Gcrypt library.
*/
void
TALER_gcrypt_init (void);
/**
* Convert a buffer to an 8-character string
* representative of the contents. This is used
* for logging binary data when debugging.
*
* @param buf buffer to log
* @param buf_size number of bytes in @a buf
* @return text representation of buf, valid until next
* call to this function
*/
const char *
TALER_b2s (const void *buf,
size_t buf_size);
/**
* Convert a fixed-sized object to a string using
* #TALER_b2s().
*
* @param obj address of object to convert
* @return string representing the binary obj buffer
*/
#define TALER_B2S(obj) TALER_b2s (obj, sizeof (*obj))
/**
* Obtain denomination amount from configuration file.
*
* @param section section of the configuration to access
* @param option option of the configuration to access
* @param[out] denom set to the amount found in configuration
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_config_get_denom (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section,
const char *option,
struct TALER_Amount *denom);
/**
* Allow user to specify an amount on the command line.
*
* @param shortName short name of the option
* @param name long name of the option
* @param argumentHelp help text for the option argument
* @param description long help text for the option
* @param[out] amount set to the amount specified at the command line
*/
struct GNUNET_GETOPT_CommandLineOption
TALER_getopt_get_amount (char shortName,
const char *name,
const char *argumentHelp,
const char *description,
struct TALER_Amount *amount);
/**
* Return default project data used by Taler.
*/
const struct GNUNET_OS_ProjectData *
TALER_project_data_default (void);
/**
* URL-encode a string according to rfc3986.
*
* @param s string to encode
* @returns the urlencoded string, the caller must free it with GNUNET_free
*/
char *
TALER_urlencode (const char *s);
/**
* Make an absolute URL with query parameters.
*
* @param base_url absolute base URL to use
* @param path path of the url
* @param ... NULL-terminated key-value pairs (char *) for query parameters,
* only the value will be url-encoded
* @returns the URL, must be freed with #GNUNET_free
*/
char *
TALER_url_join (const char *base_url,
const char *path,
...);
/**
* Make an absolute URL for the given parameters.
*
* @param proto protocol for the URL (typically https)
* @param host hostname for the URL
* @param prefix prefix for the URL
* @param path path for the URL
* @param ... NULL-terminated key-value pairs (char *) for query parameters,
* the value will be url-encoded
* @returns the URL, must be freed with #GNUNET_free
*/
char *
TALER_url_absolute_raw (const char *proto,
const char *host,
const char *prefix,
const char *path,
...);
/**
* Make an absolute URL for a given MHD connection.
*
* @param path path of the url
* @param ... NULL-terminated key-value pairs (char *) for query parameters,
* the value will be url-encoded
* @returns the URL, must be freed with #GNUNET_free
*/
char *
TALER_url_absolute_mhd (struct MHD_Connection *connection,
const char *path,
...);
#endif
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