summaryrefslogtreecommitdiff
path: root/src/include/taler_bank_service.h
blob: 1cad5710a389b8aca1b4dd0f9244301b6a62356f (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
/*
  This file is part of TALER
  Copyright (C) 2015, 2016, 2017 Taler Systems SA

  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, see <http://www.gnu.org/licenses/>
*/
/**
 * @file include/taler_bank_service.h
 * @brief C interface of libtalerbank, a C library to use the Taler bank's HTTP API
 *        This is currently ONLY used to provide the "test" wire transfer protocol.
 * @author Christian Grothoff
 */
#ifndef _TALER_BANK_SERVICE_H
#define _TALER_BANK_SERVICE_H

#include <jansson.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_util.h"
#include "taler_error_codes.h"


/**
 * Authentication method types.
 */
enum TALER_BANK_AuthenticationMethod {

  /**
   * No authentication.
   */
  TALER_BANK_AUTH_NONE,

  /**
   * Basic authentication with cleartext username and password.
   */
  TALER_BANK_AUTH_BASIC
};


/**
 * Information used to authenticate to the bank.
 */
struct TALER_BANK_AuthenticationData
{

  /**
   * Which authentication method should we use?
   */
  enum TALER_BANK_AuthenticationMethod method;

  /**
   * Further details as per @e method.
   */
  union
  {

    /**
     * Details for #TALER_BANK_AUTH_BASIC.
     */
    struct
    {
      /**
       * Username to use.
       */
      char *username;

      /**
       * Password to use.
       */
      char *password;
    } basic;

  } details;

};


/* ********************* /admin/add/incoming *********************** */


/**
 * @brief A /admin/add/incoming Handle
 */
struct TALER_BANK_AdminAddIncomingHandle;


/**
 * Callbacks of this type are used to serve the result of submitting
 * information about an incoming transaction to a bank.
 *
 * @param cls closure
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
 *                    0 if the bank's reply is bogus (fails to follow the protocol)
 * @param ec detailed error code
 * @param serial_id unique ID of the wire transfer in the bank's records; UINT64_MAX on error
 * @param json detailed response from the HTTPD, or NULL if reply was not in JSON
 */
typedef void
(*TALER_BANK_AdminAddIncomingResultCallback) (void *cls,
                                              unsigned int http_status,
                                              enum TALER_ErrorCode ec,
                                              uint64_t serial_id,
                                              const json_t *json);


/**
 * Notify the bank that we have received an incoming transaction
 * which fills a reserve.  Note that this API is an administrative
 * API and thus not accessible to typical bank clients, but only
 * to the operators of the bank.
 *
 * @param ctx curl context for the event loop
 * @param bank_base_url URL of the bank (used to execute this request)
 * @param auth authentication data to use
 * @param exchange_base_url base URL of the exchange (for tracking)
 * @param subject wire transfer subject for the transfer
 * @param amount amount that was deposited
 * @param debit_account_no account number to withdraw from (53 bits at most)
 * @param credit_account_no account number to deposit into (53 bits at most)
 * @param res_cb the callback to call when the final result for this request is available
 * @param res_cb_cls closure for the above callback
 * @return NULL
 *         if the inputs are invalid (i.e. invalid amount).
 *         In this case, the callback is not called.
 */
struct TALER_BANK_AdminAddIncomingHandle *
TALER_BANK_admin_add_incoming (struct GNUNET_CURL_Context *ctx,
                               const char *bank_base_url,
                               const struct TALER_BANK_AuthenticationData *auth,
                               const char *exchange_base_url,
                               const char *subject,
                               const struct TALER_Amount *amount,
                               uint64_t debit_account_no,
                               uint64_t credit_account_no,
                               TALER_BANK_AdminAddIncomingResultCallback res_cb,
                               void *res_cb_cls);


/**
 * Cancel an add incoming.  This function cannot be used on a request
 * handle if a response is already served for it.
 *
 * @param aai the admin add incoming request handle
 */
void
TALER_BANK_admin_add_incoming_cancel (struct TALER_BANK_AdminAddIncomingHandle *aai);


/**
 * Which types of transactions should be (or is being) returned?
 */
enum TALER_BANK_Direction {

  /**
   * Base case, used to indicate errors or end of list.
   */
  TALER_BANK_DIRECTION_NONE = 0,

  /**
   * Transactions where the bank account receives money.
   */
  TALER_BANK_DIRECTION_CREDIT = 1,

  /**
   * Transactions where the bank account looses money.
   */
  TALER_BANK_DIRECTION_DEBIT = 2,

  /**
   * Return both types of transactions.
   */
  TALER_BANK_DIRECTION_BOTH = (TALER_BANK_DIRECTION_CREDIT | TALER_BANK_DIRECTION_DEBIT),

  /**
   * Bit mask that is applied to view transactions that have been
   * cancelled. The bit is set for cancelled transactions that are
   * returned from /history, and must also be set in order for
   * cancelled transactions to show up in the /history.
   */
  TALER_BANK_DIRECTION_CANCEL = 4

};


/**
 * Handle for querying the bank's transaction history.
 */
struct TALER_BANK_HistoryHandle;

/**
 * Details about a wire transfer.
 */
struct TALER_BANK_TransferDetails
{
  /**
   * Amount that was transferred
   */
  struct TALER_Amount amount;

  /**
   * Time of the the transfer
   */
  struct GNUNET_TIME_Absolute execution_date;

  /**
   * Wire transfer subject.  Usually a reserve public key
   * followed by the base URL of the exchange.
   */
  char *wire_transfer_subject;

  /**
   * payto://-URL of the other account that was involved
   */
  char *account_url;
};


/**
 * Callbacks of this type are used to serve the result of asking
 * the bank for the transaction history.
 *
 * @param cls closure
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
 *                    0 if the bank's reply is bogus (fails to follow the protocol),
 *                    #MHD_HTTP_NO_CONTENT if there are no more results; on success the
 *                    last callback is always of this status (even if `abs(num_results)` were
 *                    already returned).
 * @param ec detailed error code
 * @param dir direction of the transfer
 * @param serial_id monotonically increasing counter corresponding to the transaction
 * @param details details about the wire transfer
 * @param json detailed response from the HTTPD, or NULL if reply was not in JSON
 */
typedef void
(*TALER_BANK_HistoryResultCallback) (void *cls,
                                     unsigned int http_status,
                                     enum TALER_ErrorCode ec,
                                     enum TALER_BANK_Direction dir,
                                     uint64_t serial_id,
                                     const struct TALER_BANK_TransferDetails *details,
                                     const json_t *json);


/**
 * Request the wire transfer history of a bank account.
 *
 * @param ctx curl context for the event loop
 * @param bank_base_url URL of the bank (used to execute this request)
 * @param auth authentication data to use
 * @param account_number which account number should we query
 * @param direction what kinds of wire transfers should be returned
 * @param start_row from which row on do we want to get results, use UINT64_MAX for the latest; exclusive
 * @param num_results how many results do we want; negative numbers to go into the past,
 *                    positive numbers to go into the future starting at @a start_row;
 *                    must not be zero.
 * @param hres_cb the callback to call with the transaction history
 * @param hres_cb_cls closure for the above callback
 * @return NULL
 *         if the inputs are invalid (i.e. zero value for @e num_results).
 *         In this case, the callback is not called.
 */
struct TALER_BANK_HistoryHandle *
TALER_BANK_history (struct GNUNET_CURL_Context *ctx,
                    const char *bank_base_url,
                    const struct TALER_BANK_AuthenticationData *auth,
                    uint64_t account_number,
                    enum TALER_BANK_Direction direction,
                    uint64_t start_row,
                    int64_t num_results,
                    TALER_BANK_HistoryResultCallback hres_cb,
                    void *hres_cb_cls);


/**
 * Cancel an history request.  This function cannot be used on a request
 * handle if the last response (anything with a status code other than
 * 200) is already served for it.
 *
 * @param hh the history request handle
 */
void
TALER_BANK_history_cancel (struct TALER_BANK_HistoryHandle *hh);


/**
 * Handle for #TALER_BANK_reject() operation.
 */
struct TALER_BANK_RejectHandle;


/**
 * Callbacks of this type are used to serve the result of asking
 * the bank to reject an incoming wire transfer.
 *
 * @param cls closure
 * @param http_status HTTP response code, #MHD_HTTP_NO_CONTENT (204) for successful status request;
 *                    #MHD_HTTP_NOT_FOUND if the rowid is unknown;
 *                    0 if the bank's reply is bogus (fails to follow the protocol),
 * @param ec detailed error code
 */
typedef void
(*TALER_BANK_RejectResultCallback) (void *cls,
                                    unsigned int http_status,
                                    enum TALER_ErrorCode ec);


/**
 * Request rejection of a wire transfer, marking it as cancelled and voiding
 * its effects.
 *
 * @param ctx curl context for the event loop
 * @param bank_base_url URL of the bank (used to execute this request)
 * @param auth authentication data to use
 * @param account_number which account number should we query
 * @param rowid transfer to reject
 * @param rcb the callback to call with the operation result
 * @param rcb_cls closure for @a rcb
 * @return NULL
 *         if the inputs are invalid.
 *         In this case, the callback is not called.
 */
struct TALER_BANK_RejectHandle *
TALER_BANK_reject (struct GNUNET_CURL_Context *ctx,
                   const char *bank_base_url,
                   const struct TALER_BANK_AuthenticationData *auth,
                   uint64_t account_number,
                   uint64_t rowid,
                   TALER_BANK_RejectResultCallback rcb,
                   void *rcb_cls);


/**
 * Cancel an reject request.  This function cannot be used on a request
 * handle if the response was is already served for it.
 *
 * @param rh the reject request handle
 */
void
TALER_BANK_reject_cancel (struct TALER_BANK_RejectHandle *rh);


/**
 * Convenience method for parsing configuration section with bank
 * authentication data.  The section must contain an option
 * "METHOD", plus other options that depend on the METHOD specified.
 *
 * @param cfg configuration to parse
 * @param section the section with the configuration data
 * @param auth[out] set to the configuration data found
 * @return #GNUNET_OK on success
 */
int
TALER_BANK_auth_parse_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg,
                           const char *section,
                           struct TALER_BANK_AuthenticationData *auth);


/**
 * Free memory inside of @a auth (but not auth itself).
 * Dual to #TALER_BANK_auth_parse_cfg().
 *
 * @param auth authentication data to free
 */
void
TALER_BANK_auth_free (struct TALER_BANK_AuthenticationData *auth);

#endif  /* _TALER_BANK_SERVICE_H */