1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
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 (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;
}
/**
* @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 (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 */
|
