aboutsummaryrefslogtreecommitdiff
path: root/src/util/json.c
blob: 74236ed1b7970776b62f056337e80b095a3886ba (plain)
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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
/*
  This file is part of TALER
  Copyright (C) 2014 Christian Grothoff (and other contributing authors)

  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, If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file util/json.c
 * @brief helper functions for JSON processing using libjansson
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_json_lib.h"

/**
 * Shorthand for exit jumps.
 */
#define EXITIF(cond)                                              \
  do {                                                            \
    if (cond) { GNUNET_break (0); goto EXITIF_exit; }             \
  } while (0)

/**
 * Shorthand for JSON parsing related exit jumps.
 */
#define UNPACK_EXITIF(cond)                                             \
  do {                                                                  \
    if (cond) { TALER_json_warn (error); goto EXITIF_exit; }            \
  } while (0)


/**
 * Convert a TALER amount to a JSON
 * object.
 *
 * @param amount the amount
 * @return a json object describing the amount
 */
json_t *
TALER_json_from_amount (const struct TALER_Amount *amount)
{
  json_t *j;

  if ( (amount->value != (uint64_t) ((json_int_t) amount->value)) ||
       (0 > ((json_int_t) amount->value)) )
  {
    /* Theoretically, json_int_t can be a 32-bit "long", or we might
       have a 64-bit value which converted to a 63-bit signed long
       long causes problems here.  So we check.  Note that depending
       on the platform, the compiler may be able to statically tell
       that at least the first check is always false. */
    GNUNET_break (0);
    return NULL;
  }
  j = json_pack ("{s:s, s:I, s:I}",
                 "currency", amount->currency,
                 "value", (json_int_t) amount->value,
                 "fraction", (json_int_t) amount->fraction);
  GNUNET_assert (NULL != j);
  return j;
}


/**
 * Convert absolute timestamp to a json string.
 *
 * @param stamp the time stamp
 * @return a json string with the timestamp in @a stamp
 */
json_t *
TALER_json_from_abs (struct GNUNET_TIME_Absolute stamp)
{
  json_t *j;
  char *mystr;
  int ret;
  ret = GNUNET_asprintf (&mystr,
                         "%llu",
                         (long long) (stamp.abs_value_us / (1000 * 1000)));
  GNUNET_assert (ret > 0);
  j = json_string (mystr);
  GNUNET_free (mystr);
  return j;
}


/**
 * Convert a signature (with purpose) to a JSON object representation.
 *
 * @param purpose purpose of the signature
 * @param signature the signature
 * @return the JSON reporesentation of the signature with purpose
 */
json_t *
TALER_json_from_eddsa_sig (const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
                           const struct GNUNET_CRYPTO_EddsaSignature *signature)
{
  json_t *root;
  json_t *el;

  root = json_object ();

  el = json_integer ((json_int_t) ntohl (purpose->size));
  json_object_set_new (root, "size", el);

  el = json_integer ((json_int_t) ntohl (purpose->purpose));
  json_object_set_new (root, "purpose", el);

  el = TALER_json_from_data (purpose,
                             ntohl (purpose->size));
  json_object_set_new (root, "eddsa_val", el);

  el = TALER_json_from_data (signature,
                             sizeof (struct GNUNET_CRYPTO_EddsaSignature));
  json_object_set_new (root, "eddsa_sig", el);

  return root;
}


/**
 * Convert a signature (with purpose) to a JSON object representation.
 *
 * @param purpose purpose of the signature
 * @param signature the signature
 * @return the JSON reporesentation of the signature with purpose
 */
json_t *
TALER_json_from_ecdsa_sig (const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
                           const struct GNUNET_CRYPTO_EcdsaSignature *signature)
{
  json_t *root;
  json_t *el;

  root = json_object ();

  el = json_integer ((json_int_t) ntohl (purpose->size));
  json_object_set_new (root, "size", el);

  el = json_integer ((json_int_t) ntohl (purpose->purpose));
  json_object_set_new (root, "purpose", el);

  el = TALER_json_from_data (purpose,
                             ntohl (purpose->size));
  json_object_set_new (root, "ecdsa_val", el);

  el = TALER_json_from_data (signature,
                             sizeof (struct GNUNET_CRYPTO_EddsaSignature));
  json_object_set_new (root, "ecdsa_sig", el);

  return root;
}


/**
 * Convert RSA public key to JSON.
 *
 * @param pk public key to convert
 * @return corresponding JSON encoding
 */
json_t *
TALER_json_from_rsa_public_key (struct GNUNET_CRYPTO_rsa_PublicKey *pk)
{
  char *buf;
  size_t buf_len;
  json_t *ret;

  buf_len = GNUNET_CRYPTO_rsa_public_key_encode (pk,
                                                 &buf);
  ret = TALER_json_from_data (buf,
                              buf_len);
  GNUNET_free (buf);
  return ret;
}


/**
 * Convert RSA signature to JSON.
 *
 * @param sig signature to convert
 * @return corresponding JSON encoding
 */
json_t *
TALER_json_from_rsa_signature (struct GNUNET_CRYPTO_rsa_Signature *sig)
{
  char *buf;
  size_t buf_len;
  json_t *ret;

  buf_len = GNUNET_CRYPTO_rsa_signature_encode (sig,
                                                &buf);
  ret = TALER_json_from_data (buf,
                              buf_len);
  GNUNET_free (buf);
  return ret;
}


/**
 * Convert binary data to a JSON string
 * with the base32crockford encoding.
 *
 * @param data binary data
 * @param size size of @a data in bytes
 * @return json string that encodes @a data
 */
json_t *
TALER_json_from_data (const void *data,
                      size_t size)
{
  char *buf;
  json_t *json;

  buf = GNUNET_STRINGS_data_to_string_alloc (data, size);
  json = json_string (buf);
  GNUNET_free (buf);
  return json;
}


/**
 * Convert binary hash to a JSON string with the base32crockford
 * encoding.
 *
 * @param hc binary data
 * @return json string that encodes @a hc
 */
json_t *
TALER_json_from_hash (const struct GNUNET_HashCode *hc)
{
  return TALER_json_from_data (hc, sizeof (struct GNUNET_HashCode));
}


/**
 * Parse given JSON object to Amount
 *
 * @param json the json object representing Amount
 * @param[out] r_amount where the amount has to be written
 * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
 */
int
TALER_json_to_amount (json_t *json,
                      struct TALER_Amount *r_amount)
{
  char *currency;
  json_int_t value;
  json_int_t fraction;
  json_error_t error;

  UNPACK_EXITIF (0 != json_unpack_ex (json, &error, JSON_STRICT,
                                      "{s:s, s:I, s:I}",
                                      "curreny", &currency,
                                      "value", &value,
                                      "fraction", &fraction));
  EXITIF (3 < strlen (currency));
  r_amount->value = (uint32_t) value;
  r_amount->fraction = (uint32_t) fraction;
  return GNUNET_OK;

 EXITIF_exit:
  return GNUNET_SYSERR;
}


/**
 * Parse given JSON object to Amount
 *
 * @param json the json object representing Amount
 * @param[out] abs where the amount has to be written
 * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
 */
int
TALER_json_to_abs (json_t *json,
                   struct GNUNET_TIME_Absolute *abs)
{
  const char *str;
  unsigned long long abs_value_s;

  GNUNET_assert (NULL != abs);
  EXITIF (NULL == (str = json_string_value (json)));
  EXITIF (1 > sscanf (str, "%llu", &abs_value_s));
  abs->abs_value_us = abs_value_s * 1000 * 1000;
  return GNUNET_OK;

 EXITIF_exit:
  return GNUNET_SYSERR;
}

/**
 * Parse given JSON object to data
 *
 * @param json the json object representing data
 * @param out the pointer to hold the parsed data.
 * @param out_size the size of @a out
 * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
 */
int
TALER_json_to_data (json_t *json,
                    void *out,
                    size_t out_size)
{
  const char *enc;
  unsigned int len;

  EXITIF (NULL == (enc = json_string_value (json)));
  len = strlen (enc);
  EXITIF ((((len * 5) / 8) + ((((len * 5) % 8) == 0) ? 0 : 1)) == out_size);
  EXITIF (GNUNET_OK != GNUNET_STRINGS_string_to_data (enc, len, out, out_size));
  return GNUNET_OK;
 EXITIF_exit:
  return GNUNET_SYSERR;
}

/* Taken from GNU gettext */
struct table_entry
{
  const char *code;
  const char *english;
};
/* Keep the following table in sync with gettext.
   WARNING: the entries should stay sorted according to the code */
static const struct table_entry country_table[] =
  {
    { "AE", "U.A.E." },
    { "AF", "Afghanistan" },
    { "AL", "Albania" },
    { "AM", "Armenia" },
    { "AN", "Netherlands Antilles" },
    { "AR", "Argentina" },
    { "AT", "Austria" },
    { "AU", "Australia" },
    { "AZ", "Azerbaijan" },
    { "BA", "Bosnia and Herzegovina" },
    { "BD", "Bangladesh" },
    { "BE", "Belgium" },
    { "BG", "Bulgaria" },
    { "BH", "Bahrain" },
    { "BN", "Brunei Darussalam" },
    { "BO", "Bolivia" },
    { "BR", "Brazil" },
    { "BT", "Bhutan" },
    { "BY", "Belarus" },
    { "BZ", "Belize" },
    { "CA", "Canada" },
    { "CG", "Congo" },
    { "CH", "Switzerland" },
    { "CI", "Cote d'Ivoire" },
    { "CL", "Chile" },
    { "CM", "Cameroon" },
    { "CN", "People's Republic of China" },
    { "CO", "Colombia" },
    { "CR", "Costa Rica" },
    { "CS", "Serbia and Montenegro" },
    { "CZ", "Czech Republic" },
    { "DE", "Germany" },
    { "DK", "Denmark" },
    { "DO", "Dominican Republic" },
    { "DZ", "Algeria" },
    { "EC", "Ecuador" },
    { "EE", "Estonia" },
    { "EG", "Egypt" },
    { "ER", "Eritrea" },
    { "ES", "Spain" },
    { "ET", "Ethiopia" },
    { "FI", "Finland" },
    { "FO", "Faroe Islands" },
    { "FR", "France" },
    { "GB", "United Kingdom" },
    { "GD", "Caribbean" },
    { "GE", "Georgia" },
    { "GL", "Greenland" },
    { "GR", "Greece" },
    { "GT", "Guatemala" },
    { "HK", "Hong Kong" },
    { "HK", "Hong Kong S.A.R." },
    { "HN", "Honduras" },
    { "HR", "Croatia" },
    { "HT", "Haiti" },
    { "HU", "Hungary" },
    { "ID", "Indonesia" },
    { "IE", "Ireland" },
    { "IL", "Israel" },
    { "IN", "India" },
    { "IQ", "Iraq" },
    { "IR", "Iran" },
    { "IS", "Iceland" },
    { "IT", "Italy" },
    { "JM", "Jamaica" },
    { "JO", "Jordan" },
    { "JP", "Japan" },
    { "KE", "Kenya" },
    { "KG", "Kyrgyzstan" },
    { "KH", "Cambodia" },
    { "KR", "South Korea" },
    { "KW", "Kuwait" },
    { "KZ", "Kazakhstan" },
    { "LA", "Laos" },
    { "LB", "Lebanon" },
    { "LI", "Liechtenstein" },
    { "LK", "Sri Lanka" },
    { "LT", "Lithuania" },
    { "LU", "Luxembourg" },
    { "LV", "Latvia" },
    { "LY", "Libya" },
    { "MA", "Morocco" },
    { "MC", "Principality of Monaco" },
    { "MD", "Moldava" },
    { "MD", "Moldova" },
    { "ME", "Montenegro" },
    { "MK", "Former Yugoslav Republic of Macedonia" },
    { "ML", "Mali" },
    { "MM", "Myanmar" },
    { "MN", "Mongolia" },
    { "MO", "Macau S.A.R." },
    { "MT", "Malta" },
    { "MV", "Maldives" },
    { "MX", "Mexico" },
    { "MY", "Malaysia" },
    { "NG", "Nigeria" },
    { "NI", "Nicaragua" },
    { "NL", "Netherlands" },
    { "NO", "Norway" },
    { "NP", "Nepal" },
    { "NZ", "New Zealand" },
    { "OM", "Oman" },
    { "PA", "Panama" },
    { "PE", "Peru" },
    { "PH", "Philippines" },
    { "PK", "Islamic Republic of Pakistan" },
    { "PL", "Poland" },
    { "PR", "Puerto Rico" },
    { "PT", "Portugal" },
    { "PY", "Paraguay" },
    { "QA", "Qatar" },
    { "RE", "Reunion" },
    { "RO", "Romania" },
    { "RS", "Serbia" },
    { "RU", "Russia" },
    { "RW", "Rwanda" },
    { "SA", "Saudi Arabia" },
    { "SE", "Sweden" },
    { "SG", "Singapore" },
    { "SI", "Slovenia" },
    { "SK", "Slovak" },
    { "SN", "Senegal" },
    { "SO", "Somalia" },
    { "SR", "Suriname" },
    { "SV", "El Salvador" },
    { "SY", "Syria" },
    { "TH", "Thailand" },
    { "TJ", "Tajikistan" },
    { "TM", "Turkmenistan" },
    { "TN", "Tunisia" },
    { "TR", "Turkey" },
    { "TT", "Trinidad and Tobago" },
    { "TW", "Taiwan" },
    { "TZ", "Tanzania" },
    { "UA", "Ukraine" },
    { "US", "United States" },
    { "UY", "Uruguay" },
    { "VA", "Vatican" },
    { "VE", "Venezuela" },
    { "VN", "Viet Nam" },
    { "YE", "Yemen" },
    { "ZA", "South Africa" },
    { "ZW", "Zimbabwe" }
  };

static int
cmp_country_code (const void *ptr1, const void *ptr2)
{
  const struct table_entry *cc1 = ptr1;
  const struct table_entry *cc2 = ptr2;

  return strncmp (cc1->code, cc2->code, 2);
}

/**
 * Validates given IBAN according to the European Banking Standards.  See:
 * http://www.europeanpaymentscouncil.eu/documents/ECBS%20IBAN%20standard%20EBS204_V3.2.pdf
 *
 * @param iban the IBAN number to validate
 * @return 1 is validated successfully; 0 if not.
 */
static int
validate_iban (const char *iban)
{
  char cc[2];
  char ibancpy[35];
  struct table_entry cc_entry;
  unsigned int len;
  char *nbuf;
  int i,j;

  len = strlen(iban);
  if (len > 34)
    return 0;
  (void) strncpy (cc, iban, 2);
  (void) strncpy (ibancpy, iban+4, len - 4);
  (void) strncpy (ibancpy + len - 4, iban, 4);
  ibancpy[len] = '\0';
  cc_entry.code = cc;
  cc_entry.english = NULL;
  if (NULL ==
      bsearch (&cc_entry, country_table,
               sizeof(country_table)/sizeof(struct table_entry),
               sizeof (struct table_entry),
               &cmp_country_code))
    return 0;
  nbuf = GNUNET_malloc((len * 2) + 1);
  for (i=0, j=0; i < len; i++)
  {
    if(isalpha(ibancpy[i]))
    {
      EXITIF(2 != snprintf(&nbuf[j], 3, "%2u", (ibancpy[i] - 'A' + 10)));
      j+=2;
      continue;
    }
    nbuf[j] = ibancpy[i];
    j++;
  }
  for (j=0; ;j++)
  {
    if ('\0' == nbuf[j])
      break;
    GNUNET_assert (isdigit(nbuf[j]));
  }
  unsigned long long dividend;
  unsigned long long remainder = 0;
  int nread;
  int ret;
  GNUNET_assert (sizeof(dividend) >= 8);
  for (i=0; i<j; i+=16)
  {
    EXITIF (1 != (ret = sscanf(&nbuf[i], "%16llu %n", &dividend, &nread)));
    if (0 != remainder)
      dividend += remainder * (pow (10, nread));
    remainder = dividend % 97;
  }
  EXITIF (1 != remainder);
  GNUNET_free (nbuf);
  return 1;

 EXITIF_exit:
  GNUNET_free (nbuf);
  return 0;
}

/**
 * Check if the given wire format JSON object is correctly formatted
 *
 * @param type the type of the wire format
 * @param wire the JSON wire format object
 * @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
 */
int
TALER_json_validate_wireformat (const char *type,
				const json_t *wire)
{
  json_error_t error;

  if (0 == strcasecmp ("SEPA", type))
  {
    const char *type;
    const char *iban;
    const char *name;
    const char *bic;
    const char *edate;
    uint64_t r;
    const char *address;
    UNPACK_EXITIF (0 != json_unpack_ex
                   ((json_t *) wire,
		    &error, JSON_STRICT,
                    "{"
                    "s:s " /* type: "SEPA" */
                    "s:s " /* IBAN: iban */
                    "s:s " /* name: beneficiary name */
                    "s:s " /* BIC: beneficiary bank's BIC */
                    "s:s " /* edate: transfer execution date */
                    "s:i " /* r: random 64-bit integer nounce */
                    "s?s " /* address: address of the beneficiary */
                    "}",
                    "type", &type,
                    "IBAN", &iban,
                    "name", &name,
                    "bic", &bic,
                    "edate", &edate,
                    "r", &r,
                    "address", &address));
    EXITIF (0 != strcmp (type, "SEPA"));
    EXITIF (1 != validate_iban (iban));
    return GNUNET_YES;
  }

 EXITIF_exit:
  return GNUNET_NO;
}

/* End of util/json.c */