sync_object.c (6479B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2026 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file util/sync_object.c 18 * @brief shared logic for object JSON parsing and serialization 19 * @author Iván Ávalos 20 */ 21 #include "platform.h" 22 #include <gnunet/gnunet_common.h> 23 #include <gnunet/gnunet_json_lib.h> 24 #include <jansson.h> 25 #include <taler/taler_json_lib.h> 26 #include <sync/sync_util.h> 27 28 29 enum GNUNET_GenericReturnValue 30 SYNC_object_entry_parse ( 31 json_t *input, 32 struct SYNC_ObjectEntry *entry) 33 { 34 struct GNUNET_JSON_Specification espec[] = { 35 GNUNET_JSON_spec_fixed_auto ("uid", 36 &entry->uid), 37 GNUNET_JSON_spec_varsize ("data", 38 &entry->data, 39 &entry->data_size), 40 GNUNET_JSON_spec_end () 41 }; 42 enum GNUNET_GenericReturnValue res; 43 const char *ename; 44 unsigned int eline; 45 46 res = GNUNET_JSON_parse (input, 47 espec, 48 &ename, 49 &eline); 50 if (GNUNET_OK != res) 51 { 52 GNUNET_break_op (0); 53 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 54 "Failed to parse object entry at field %s\n", 55 ename); 56 return GNUNET_SYSERR; 57 } 58 return GNUNET_OK; 59 } 60 61 62 void 63 SYNC_object_entry_clear ( 64 struct SYNC_ObjectEntry *entry) 65 { 66 GNUNET_free (entry->data); 67 entry->data = NULL; 68 entry->data_size = 0; 69 } 70 71 72 json_t * 73 SYNC_object_entry_serialize ( 74 const struct SYNC_ObjectUID *uid, 75 size_t data_size, 76 const void *data) 77 { 78 return GNUNET_JSON_PACK ( 79 GNUNET_JSON_pack_data_auto ("uid", 80 uid), 81 GNUNET_JSON_pack_data_varsize ("data", 82 data, 83 data_size)); 84 } 85 86 87 json_t * 88 SYNC_object_refs_serialize ( 89 size_t refs_len, 90 const struct SYNC_ObjectUID *object_uids, 91 const int16_t *object_incs) 92 { 93 json_t *refs; 94 95 if (0 == refs_len) 96 return NULL; 97 refs = json_object (); 98 GNUNET_assert (NULL != refs); 99 for (size_t i = 0; i < refs_len; i++) 100 { 101 char *key; 102 103 key = GNUNET_STRINGS_data_to_string_alloc (&object_uids[i], 104 sizeof (object_uids[i])); 105 GNUNET_assert (0 == 106 json_object_set_new (refs, 107 key, 108 json_integer (object_incs[i]))); 109 GNUNET_free (key); 110 } 111 return refs; 112 } 113 114 115 GNUNET_NETWORK_STRUCT_BEGIN 116 117 /** 118 * One object reference, as hashed for the signatures. 119 */ 120 struct SYNC_ObjectRefP 121 { 122 /** 123 * UID of the referenced object. 124 */ 125 struct SYNC_ObjectUID uid; 126 127 /** 128 * Reference count adjustment, in network byte order. 129 */ 130 int16_t inc GNUNET_PACKED; 131 }; 132 133 GNUNET_NETWORK_STRUCT_END 134 135 136 /** 137 * Compare two object references by UID, for #qsort(). 138 * 139 * @param a first `struct SYNC_ObjectRefP` 140 * @param b second `struct SYNC_ObjectRefP` 141 * @return negative/zero/positive as @a a sorts before/equal/after @a b 142 */ 143 static int 144 ref_cmp (const void *a, 145 const void *b) 146 { 147 const struct SYNC_ObjectRefP *ra = a; 148 const struct SYNC_ObjectRefP *rb = b; 149 150 return memcmp (&ra->uid, 151 &rb->uid, 152 sizeof (ra->uid)); 153 } 154 155 156 enum GNUNET_GenericReturnValue 157 SYNC_object_refs_hash ( 158 size_t refs_len, 159 const struct SYNC_ObjectUID *object_uids, 160 const int16_t *object_incs, 161 struct GNUNET_HashCode *refs_hash) 162 { 163 struct SYNC_ObjectRefP *refs; 164 165 if (0 == refs_len) 166 { 167 GNUNET_CRYPTO_hash ("", 168 0, 169 refs_hash); 170 return GNUNET_OK; 171 } 172 refs = GNUNET_new_array (refs_len, 173 struct SYNC_ObjectRefP); 174 for (size_t i = 0; i < refs_len; i++) 175 { 176 refs[i].uid = object_uids[i]; 177 refs[i].inc = htons ((uint16_t) object_incs[i]); 178 } 179 qsort (refs, 180 refs_len, 181 sizeof (struct SYNC_ObjectRefP), 182 &ref_cmp); 183 for (size_t i = 1; i < refs_len; i++) 184 { 185 if (0 == ref_cmp (&refs[i - 1], 186 &refs[i])) 187 { 188 GNUNET_break (0); 189 GNUNET_free (refs); 190 return GNUNET_SYSERR; 191 } 192 } 193 GNUNET_CRYPTO_hash (refs, 194 refs_len * sizeof (struct SYNC_ObjectRefP), 195 refs_hash); 196 GNUNET_free (refs); 197 return GNUNET_OK; 198 } 199 200 201 enum GNUNET_GenericReturnValue 202 SYNC_object_refs_parse ( 203 const json_t *refs, 204 size_t *refs_len, 205 struct SYNC_ObjectUID **object_uids, 206 int16_t **object_incs) 207 { 208 struct SYNC_ObjectUID *uids; 209 int16_t *incs; 210 size_t len; 211 size_t i; 212 const char *key; 213 json_t *value; 214 215 if (NULL == refs) 216 { 217 *refs_len = 0; 218 *object_uids = NULL; 219 *object_incs = NULL; 220 return GNUNET_OK; 221 } 222 if (! json_is_object (refs)) 223 { 224 GNUNET_break_op (0); 225 return GNUNET_SYSERR; 226 } 227 len = json_object_size (refs); 228 if (0 == len) 229 { 230 *refs_len = 0; 231 *object_uids = NULL; 232 *object_incs = NULL; 233 return GNUNET_OK; 234 } 235 uids = GNUNET_new_array (len, 236 struct SYNC_ObjectUID); 237 incs = GNUNET_new_array (len, 238 int16_t); 239 i = 0; 240 json_object_foreach ((json_t *) refs, key, value) 241 { 242 json_int_t inc; 243 244 if (GNUNET_OK != 245 GNUNET_STRINGS_string_to_data (key, 246 strlen (key), 247 &uids[i], 248 sizeof (uids[i]))) 249 { 250 GNUNET_break_op (0); 251 goto fail; 252 } 253 if (! json_is_integer (value)) 254 { 255 GNUNET_break_op (0); 256 goto fail; 257 } 258 inc = json_integer_value (value); 259 if ( (inc < INT16_MIN) || 260 (inc > INT16_MAX) ) 261 { 262 GNUNET_break_op (0); 263 goto fail; 264 } 265 incs[i] = (int16_t) inc; 266 i++; 267 } 268 *refs_len = len; 269 *object_uids = uids; 270 *object_incs = incs; 271 return GNUNET_OK; 272 fail: 273 GNUNET_free (uids); 274 GNUNET_free (incs); 275 return GNUNET_SYSERR; 276 }