aboutsummaryrefslogtreecommitdiff
path: root/src/mint/taler-mint-httpd_responses.c
blob: 92bba9e21e9dcc2090b6e35c5eee642a38366703 (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
/*
  This file is part of TALER
  (C) 2014 GNUnet e.V.

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License along with
  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
*/

/**
 * @file taler-mint-httpd_responses.c
 * @brief API for generating the various replies of the mint; these
 *        functions are called TALER_MINT_reply_ and they generate
 *        and queue MHD response objects for a given connection.
 * @author Florian Dold
 * @author Benedikt Mueller
 * @author Christian Grothoff
 *
 * TODO:
 * - when generating /withdraw/status reply, which signature do
 *   we use there? Might want to instead return *all* signatures on the
 *   existig withdraw operations, instead of Mint's signature
 *   (check reply format, adjust `struct Reserve` if needed)
 */
#include "platform.h"
#include "taler-mint-httpd_responses.h"
#include "taler_util.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler-mint-httpd_keystate.h"


/**
 * Send JSON object as response.
 *
 * @param connection the MHD connection
 * @param json the json object
 * @param response_code the http response code
 * @return MHD result code
 */
int
TALER_MINT_reply_json (struct MHD_Connection *connection,
                       const json_t *json,
                       unsigned int response_code)
{
  struct MHD_Response *resp;
  char *json_str;
  int ret;

  json_str = json_dumps (json, JSON_INDENT(2));
  resp = MHD_create_response_from_buffer (strlen (json_str), json_str,
                                          MHD_RESPMEM_MUST_FREE);
  if (NULL == resp)
    return MHD_NO;
  (void) MHD_add_response_header (resp,
                                  MHD_HTTP_HEADER_CONTENT_TYPE,
                                  "application/json");
  ret = MHD_queue_response (connection, response_code, resp);
  MHD_destroy_response (resp);
  return ret;
}


/**
 * Function to call to handle the request by building a JSON
 * reply from a format string and varargs.
 *
 * @param connection the MHD connection to handle
 * @param response_code HTTP response code to use
 * @param fmt format string for pack
 * @param ... varargs
 * @return MHD result code
 */
int
TALER_MINT_reply_json_pack (struct MHD_Connection *connection,
                            unsigned int response_code,
                            const char *fmt,
                            ...)
{
  json_t *json;
  va_list argp;
  int ret;

  va_start (argp, fmt);
  json = json_vpack_ex (NULL, 0, fmt, argp);
  va_end (argp);
  if (NULL == json)
    return MHD_NO;
  ret = TALER_MINT_reply_json (connection,
                               json,
                               response_code);
  json_decref (json);
  return ret;
}


/**
 * Send a response indicating an invalid argument.
 *
 * @param connection the MHD connection to use
 * @param param_name the parameter that is invalid
 * @return a MHD result code
 */
int
TALER_MINT_reply_arg_invalid (struct MHD_Connection *connection,
                              const char *param_name)
{
  return TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_BAD_REQUEST,
                                     "{s:s, s:s}",
                                     "error", "invalid parameter",
                                     "parameter", param_name);
}


/**
 * Send a response indicating an invalid coin.  (I.e. the signature
 * over the public key of the coin does not match a valid signing key
 * of this mint).
 *
 * @param connection the MHD connection to use
 * @return MHD result code
 */
int
TALER_MINT_reply_coin_invalid (struct MHD_Connection *connection)
{
  /* TODO: may want to be more precise in the future and
     distinguish bogus signatures from bogus public keys. */
  return TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_NOT_FOUND,
                                     "{s:s}",
                                     "error", "Coin is not valid");
}


/**
 * Send a response indicating a missing argument.
 *
 * @param connection the MHD connection to use
 * @param param_name the parameter that is missing
 * @return a MHD result code
 */
int
TALER_MINT_reply_arg_missing (struct MHD_Connection *connection,
                              const char *param_name)
{
  return TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_BAD_REQUEST,
                                     "{ s:s, s:s}",
                                     "error", "missing parameter",
                                     "parameter", param_name);
}


/**
 * Send a response indicating an internal error.
 *
 * @param connection the MHD connection to use
 * @param hint hint about the internal error's nature
 * @return a MHD result code
 */
int
TALER_MINT_reply_internal_error (struct MHD_Connection *connection,
                                 const char *hint)
{
  return TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_BAD_REQUEST,
                                     "{s:s, s:s}",
                                     "error", "internal error",
                                     "hint", hint);
}


/**
 * Send a response indicating a failure to talk to the Mint's
 * database.
 *
 * @param connection the MHD connection to use
 * @return a MHD result code
 */
int
TALER_MINT_reply_internal_db_error (struct MHD_Connection *connection)
{
  return TALER_MINT_reply_internal_error (connection,
                                          "Failed to connect to database");
}


/**
 * Send a response indicating that the request was too big.
 *
 * @param connection the MHD connection to use
 * @return a MHD result code
 */
int
TALER_MINT_reply_request_too_large (struct MHD_Connection *connection)
{
  struct MHD_Response *resp;
  int ret;

  resp = MHD_create_response_from_buffer (0,
                                          NULL,
                                          MHD_RESPMEM_PERSISTENT);
  if (NULL == resp)
    return MHD_NO;
  ret = MHD_queue_response (connection,
                            MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
                            resp);
  MHD_destroy_response (resp);
  return ret;
}


/**
 * Send a response indicating that the JSON was malformed.
 *
 * @param connection the MHD connection to use
 * @return a MHD result code
 */
int
TALER_MINT_reply_invalid_json (struct MHD_Connection *connection)
{
  return TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_BAD_REQUEST,
                                     "{s:s}",
                                     "error",
                                     "invalid json");
}


/**
 * Send confirmation of deposit success to client.  This function
 * will create a signed message affirming the given information
 * and return it to the client.  By this, the mint affirms that
 * the coin had sufficient (residual) value for the specified
 * transaction and that it will execute the requested deposit
 * operation with the given wiring details.
 *
 * @param connection connection to the client
 * @param coin_pub public key of the coin
 * @param h_wire hash of wire details
 * @param h_contract hash of contract details
 * @param transaction_id transaction ID
 * @param merchant merchant public key
 * @param amount fraction of coin value to deposit
 * @return MHD result code
 */
int
TALER_MINT_reply_deposit_success (struct MHD_Connection *connection,
                                  const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub,
                                  const struct GNUNET_HashCode *h_wire,
                                  const struct GNUNET_HashCode *h_contract,
                                  uint64_t transaction_id,
                                  const struct GNUNET_CRYPTO_EddsaPublicKey *merchant,
                                  const struct TALER_Amount *amount)
{
  struct TALER_DepositConfirmation dc;
  struct GNUNET_CRYPTO_EddsaSignature sig;
  json_t *sig_json;
  int ret;

  dc.purpose.purpose = htonl (TALER_SIGNATURE_MINT_DEPOSIT);
  dc.purpose.size = htonl (sizeof (struct TALER_DepositConfirmation));
  dc.h_contract = *h_contract;
  dc.h_wire = *h_wire;
  dc.transaction_id = GNUNET_htonll (transaction_id);
  dc.amount = TALER_amount_hton (*amount);
  dc.coin_pub = *coin_pub;
  dc.merchant = *merchant;
  TALER_MINT_keys_sign (&dc.purpose,
                        &sig);
  {
    LOG_WARNING ("Failed to create EdDSA signature using my private key\n");
    return TALER_MINT_reply_internal_error (connection,
                                            "Failed to EdDSA-sign response\n");
  }
  sig_json = TALER_JSON_from_sig (&dc.purpose, &sig);
  ret = TALER_MINT_reply_json_pack (connection,
                                    MHD_HTTP_OK,
                                    "{s:s, s:o}",
                                    "status", "DEPOSIT_OK",
                                    "signature", sig_json);
  json_decref (sig_json);
  return ret;
}


/**
 * Send reserve status information to client.
 *
 * @param connection connection to the client
 * @param balance current reserve balance
 * @param expiration when will the reserve expire
 * @return MHD result code
 */
int
TALER_MINT_reply_withdraw_status_success (struct MHD_Connection *connection,
                                          const struct TALER_Amount balance,
                                          struct GNUNET_TIME_Absolute expiration)
{
  json_t *json_balance;
  json_t *json_expiration;
  int ret;

  json_balance = TALER_JSON_from_amount (balance);
  json_expiration = TALER_JSON_from_abs (expiration);
  ret = TALER_MINT_reply_json_pack (connection,
                                    MHD_HTTP_OK,
                                    "{s:o, s:o}",
                                    "balance", json_balance,
                                    "expiration", json_expiration);
  json_decref (json_balance);
  json_decref (json_expiration);
  return ret;
}


/**
 * Send blinded coin information to client.
 *
 * @param connection connection to the client
 * @param collectable blinded coin to return
 * @return MHD result code
 */
int
TALER_MINT_reply_withdraw_sign_success (struct MHD_Connection *connection,
                                        const struct CollectableBlindcoin *collectable)
{
  json_t *sig_json;
  size_t sig_buf_size;
  char *sig_buf;
  int ret;

  /* FIXME: use TALER_JSON_from_sig here instead! */
  sig_buf_size = GNUNET_CRYPTO_rsa_signature_encode (collectable->sig,
                                                     &sig_buf);
  sig_json = TALER_JSON_from_data (sig_buf,
                                   sig_buf_size);
  GNUNET_free (sig_buf);
  ret = TALER_MINT_reply_json_pack (connection,
                                    MHD_HTTP_OK,
                                    "{s:o}",
                                    "ev_sig", sig_json);
  json_decref (sig_json);
  return ret;
}


/**
 * Send a response for "/refresh/melt".
 *
 * @param connection the connection to send the response to
 * @param db_conn the database connection to fetch values from
 * @param session_pub the refresh session public key.
 * @return a MHD result code
 */
int
TALER_MINT_reply_refresh_melt_success (struct MHD_Connection *connection,
                                       const struct RefreshSession *session,
                                       const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub)
{
  int ret;
  json_t *list;
  struct GNUNET_HashContext *hash_context;
  struct RefreshMeltResponseSignatureBody body;
  struct GNUNET_CRYPTO_EddsaSignature sig;
  json_t *sig_json;

  list = json_array ();
  hash_context = GNUNET_CRYPTO_hash_context_start ();
  body.purpose.size = htonl (sizeof (struct RefreshMeltResponseSignatureBody));
  body.purpose.purpose = htonl (TALER_SIGNATURE_REFRESH_MELT_RESPONSE);
  /* FIXME: should we not add something to the hash_context in the meantime? */
  GNUNET_CRYPTO_hash_context_finish (hash_context,
                                     &body.melt_response_hash);
  TALER_MINT_keys_sign (&body.purpose,
                        &sig);
  sig_json = TALER_JSON_from_sig (&body.purpose, &sig);
  GNUNET_assert (NULL != sig_json);
  ret = TALER_MINT_reply_json_pack (connection,
                                    MHD_HTTP_OK,
                                    "{s:o, s:o}",
                                    "signature", sig_json,
                                    "blind_session_pubs", list);
  json_decref (sig_json);
  json_decref (list);
  return ret;
}


/**
 * Send a response to a "/refresh/commit" request.
 *
 * FIXME: maybe not the ideal argument type for @a refresh_session here.
 *
 * @param connection the connection to send the response to
 * @param refresh_session the refresh session
 * @return a MHD status code
 */
int
TALER_MINT_reply_refresh_commit_success (struct MHD_Connection *connection,
                                         struct RefreshSession *refresh_session)
{
  struct RefreshCommitResponseSignatureBody body;
  struct GNUNET_CRYPTO_EddsaSignature sig;
  json_t *sig_json;
  int ret;

  body.purpose.size = htonl (sizeof (struct RefreshCommitResponseSignatureBody));
  body.purpose.purpose = htonl (TALER_SIGNATURE_REFRESH_COMMIT_RESPONSE);
  body.noreveal_index = htons (refresh_session->noreveal_index);
  TALER_MINT_keys_sign (&body.purpose,
                        &sig);
  sig_json = TALER_JSON_from_sig (&body.purpose, &sig);
  GNUNET_assert (NULL != sig_json);
  ret = TALER_MINT_reply_json_pack (connection,
                                     MHD_HTTP_OK,
                                     "{s:i, s:o}",
                                     "noreveal_index", (int) refresh_session->noreveal_index,
                                     "signature", sig_json);
  json_decref (sig_json);
  return ret;
}


/**
 * Send a response for "/refresh/reveal".
 *
 * @param connection the connection to send the response to
 * @param num_newcoins number of new coins for which we reveal data
 * @param sigs array of @a num_newcoins signatures revealed
 * @return a MHD result code
 */
int
TALER_MINT_reply_refresh_reveal_success (struct MHD_Connection *connection,
                                         unsigned int num_newcoins,
                                         struct GNUNET_CRYPTO_rsa_Signature **sigs)
{
  int newcoin_index;
  json_t *root;
  json_t *list;
  char *buf;
  size_t buf_size;
  int ret;

  root = json_object ();
  list = json_array ();
  json_object_set_new (root, "ev_sigs", list);
  for (newcoin_index = 0; newcoin_index < num_newcoins; newcoin_index++)
  {
    buf_size = GNUNET_CRYPTO_rsa_signature_encode (sigs[newcoin_index],
                                                   &buf);
    json_array_append_new (list,
                           TALER_JSON_from_data (buf,
                                                 buf_size));
    GNUNET_free (buf);
  }
  ret = TALER_MINT_reply_json (connection,
                               root,
                               MHD_HTTP_OK);
  json_decref (root);
  return ret;
}



/* end of taler-mint-httpd_responses.c */