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/*
This file is part of TALER
Copyright (C) 2014-2020 Taler Systems SA
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 extension_age_restriction.c
* @brief Utility functions regarding age restriction
* @author Özgür Kesim
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_extensions.h"
#include "stdint.h"
/**
*
* @param cfg Handle to the GNUNET configuration
* @param[out] Mask for age restriction. Will be 0 if age restriction was not enabled in the config.
* @return Error if extension for age restriction was set, but age groups were
* invalid, OK otherwise.
*/
enum TALER_Extension_ReturnValue
TALER_get_age_mask (const struct GNUNET_CONFIGURATION_Handle *cfg,
struct TALER_AgeMask *mask)
{
char *groups;
enum TALER_Extension_ReturnValue ret = TALER_Extension_ERROR_SYS;
if ((GNUNET_YES != GNUNET_CONFIGURATION_have_value (cfg,
TALER_EXTENSION_SECTION_AGE_RESTRICTION,
"ENABLED")) ||
(GNUNET_YES != GNUNET_CONFIGURATION_get_value_yesno (cfg,
TALER_EXTENSION_SECTION_AGE_RESTRICTION,
"ENABLED")))
{
/* Age restriction is not enabled */
mask->mask = 0;
return TALER_Extension_OK;
}
/* Age restriction is enabled, extract age groups */
if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg,
TALER_EXTENSION_SECTION_AGE_RESTRICTION,
"AGE_GROUPS",
&groups))
{
/* FIXME: log error? */
return TALER_Extension_ERROR_SYS;
}
if (groups == NULL)
{
/* No groups defined in config, return default_age_mask */
mask->mask = TALER_EXTENSION_DEFAULT_AGE_MASK;
return TALER_Extension_OK;
}
ret = TALER_parse_age_group_string (groups, mask);
GNUNET_free (groups);
return ret;
}
/**
* @param groups String representation of the age groups. Must be of the form
* a:b:...:n:m
* with
* 0 < a < b <...< n < m < 32
* @param[out] mask Bit representation of the age groups.
* @return Error if string was invalid, OK otherwise.
*/
enum TALER_Extension_ReturnValue
TALER_parse_age_group_string (const char *groups,
struct TALER_AgeMask *mask)
{
enum TALER_Extension_ReturnValue ret = TALER_Extension_ERROR_SYS;
char *pos;
unsigned int prev = 0;
unsigned int val;
char dummy;
while (1)
{
pos = strchr (groups, ':');
if (NULL != pos)
{
*pos = 0;
}
if (1 != sscanf (groups,
"%u%c",
&val,
&dummy))
{
/* Invalid input */
mask->mask = 0;
ret = TALER_Extension_ERROR_PARSING;
break;
}
else if ((0 >= val) || (32 <= val) || (prev >= val))
{
/* Invalid value */
mask->mask = 0;
ret = TALER_Extension_ERROR_INVALID;
break;
}
/* Set the corresponding bit in the mask */
mask->mask |= 1 << val;
if (NULL == pos)
{
/* We reached the end. Mark zeroth age-group and exit. */
mask->mask |= 1;
ret = TALER_Extension_OK;
break;
}
prev = val;
*pos = ':';
groups = pos + 1;
}
return ret;
}
/**
* Encodes the age mask into a string, like "8:10:12:14:16:18:21"
*
* @param mask Age mask
* @return String representation of the age mask, allocated by GNUNET_malloc.
* Can be used as value in the TALER config.
*/
char *
TALER_age_mask_to_string (const struct TALER_AgeMask *m)
{
uint32_t mask = m->mask;
unsigned int n = 0;
char *buf = GNUNET_malloc (32 * 3); // max characters possible
char *pos = buf;
if (NULL == buf)
{
return buf;
}
while (mask != 0)
{
mask >>= 1;
n++;
if (0 == (mask & 1))
{
continue;
}
if (n > 9)
{
*(pos++) = '0' + n / 10;
}
*(pos++) = '0' + n % 10;
if (0 != (mask >> 1))
{
*(pos++) = ':';
}
}
return buf;
}
/* end of extension_age_restriction.c */
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