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1/*
2 This file is part of GNUnet
3 Copyright (C) 2013, 2014, 2016 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file reclaim-attribute/plugin_reclaim_attestation_gnuid.c
23 * @brief reclaim-attribute-plugin-gnuid attribute plugin to provide the API for
24 * fundamental
25 * attribute types.
26 *
27 * @author Martin Schanzenbach
28 */
29#include "platform.h"
30#include "gnunet_util_lib.h"
31#include "gnunet_reclaim_plugin.h"
32#include <inttypes.h>
33#include <jansson.h>
34
35/**
36 * Convert the 'value' of an attestation to a string.
37 *
38 * @param cls closure, unused
39 * @param type type of the attestation
40 * @param data value in binary encoding
41 * @param data_size number of bytes in @a data
42 * @return NULL on error, otherwise human-readable representation of the value
43 */
44static char *
45jwt_value_to_string (void *cls,
46 uint32_t type,
47 const void *data,
48 size_t data_size)
49{
50 switch (type)
51 {
52 case GNUNET_RECLAIM_ATTESTATION_TYPE_JWT:
53 return GNUNET_strndup (data, data_size);
54
55 default:
56 return NULL;
57 }
58}
59
60
61/**
62 * Convert human-readable version of a 'value' of an attestation to the binary
63 * representation.
64 *
65 * @param cls closure, unused
66 * @param type type of the attestation
67 * @param s human-readable string
68 * @param data set to value in binary encoding (will be allocated)
69 * @param data_size set to number of bytes in @a data
70 * @return #GNUNET_OK on success
71 */
72static int
73jwt_string_to_value (void *cls,
74 uint32_t type,
75 const char *s,
76 void **data,
77 size_t *data_size)
78{
79 if (NULL == s)
80 return GNUNET_SYSERR;
81 switch (type)
82 {
83 case GNUNET_RECLAIM_ATTESTATION_TYPE_JWT:
84 *data = GNUNET_strdup (s);
85 *data_size = strlen (s);
86 return GNUNET_OK;
87
88 default:
89 return GNUNET_SYSERR;
90 }
91}
92
93
94/**
95 * Mapping of attestation type numbers to human-readable
96 * attestation type names.
97 */
98static struct
99{
100 const char *name;
101 uint32_t number;
102} jwt_attest_name_map[] = { { "JWT", GNUNET_RECLAIM_ATTESTATION_TYPE_JWT },
103 { NULL, UINT32_MAX } };
104
105/**
106 * Convert a type name to the corresponding number.
107 *
108 * @param cls closure, unused
109 * @param jwt_typename name to convert
110 * @return corresponding number, UINT32_MAX on error
111 */
112static uint32_t
113jwt_typename_to_number (void *cls, const char *jwt_typename)
114{
115 unsigned int i;
116
117 i = 0;
118 while ((NULL != jwt_attest_name_map[i].name) &&
119 (0 != strcasecmp (jwt_typename, jwt_attest_name_map[i].name)))
120 i++;
121 return jwt_attest_name_map[i].number;
122}
123
124
125/**
126 * Convert a type number (i.e. 1) to the corresponding type string
127 *
128 * @param cls closure, unused
129 * @param type number of a type to convert
130 * @return corresponding typestring, NULL on error
131 */
132static const char *
133jwt_number_to_typename (void *cls, uint32_t type)
134{
135 unsigned int i;
136
137 i = 0;
138 while ((NULL != jwt_attest_name_map[i].name) && (type !=
139 jwt_attest_name_map[i].
140 number))
141 i++;
142 return jwt_attest_name_map[i].name;
143}
144
145/**
146 * Parse a JWT and return the respective claim value as Attribute
147 *
148 * @param attest the jwt attestation
149 * @param claim the name of the claim in the JWT
150 *
151 * @return a GNUNET_RECLAIM_Attribute, containing the new value
152 */
153struct GNUNET_RECLAIM_AttributeList *
154jwt_parse_attributes (void *cls,
155 const struct GNUNET_RECLAIM_Attestation *attest)
156{
157 char *jwt_string;
158 struct GNUNET_RECLAIM_AttributeList *attrs;
159 char delim[] = ".";
160 char *val_str = NULL;
161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
162 char *decoded_jwt;
163 json_t *json_val;
164 json_error_t *json_err = NULL;
165
166 if (GNUNET_RECLAIM_ATTESTATION_TYPE_JWT != attest->type)
167 return NULL;
168 attrs = GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
169
170 jwt_string = GNUNET_strdup (attest->data);
171 const char *jwt_body = strtok (jwt_string, delim);
172 jwt_body = strtok (NULL, delim);
173 GNUNET_STRINGS_base64_decode (jwt_body, strlen (jwt_body),
174 (void **) &decoded_jwt);
175 json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, json_err);
176 const char *key;
177 json_t *value;
178 json_object_foreach (json_val, key, value) {
179 val_str = json_dumps (value, JSON_ENCODE_ANY);
180 GNUNET_RECLAIM_attribute_list_add (attrs,
181 key,
182 NULL,
183 GNUNET_RECLAIM_ATTRIBUTE_TYPE_STRING,//FIXME
184 val_str,
185 strlen (val_str));
186 GNUNET_free (val_str);
187 }
188 GNUNET_free (jwt_string);
189 //FIXME needed??
190 return attrs;
191}
192
193
194
195
196/**
197 * Entry point for the plugin.
198 *
199 * @param cls NULL
200 * @return the exported block API
201 */
202void *
203libgnunet_plugin_reclaim_attestation_jwt_init (void *cls)
204{
205 struct GNUNET_RECLAIM_AttestationPluginFunctions *api;
206
207 api = GNUNET_new (struct GNUNET_RECLAIM_AttestationPluginFunctions);
208 api->value_to_string = &jwt_value_to_string;
209 api->string_to_value = &jwt_string_to_value;
210 api->typename_to_number = &jwt_typename_to_number;
211 api->number_to_typename = &jwt_number_to_typename;
212 api->get_attributes = &jwt_parse_attributes;
213 return api;
214}
215
216
217/**
218 * Exit point from the plugin.
219 *
220 * @param cls the return value from #libgnunet_plugin_block_test_init()
221 * @return NULL
222 */
223void *
224libgnunet_plugin_reclaim_attestation_jwt_done (void *cls)
225{
226 struct GNUNET_RECLAIM_AttestationPluginFunctions *api = cls;
227
228 GNUNET_free (api);
229 return NULL;
230}
231
232
233/* end of plugin_reclaim_attestation_type_gnuid.c */