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
|
/*
This file is part of TALER
Copyright (C) 2019 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 sync-httpd_backup.c
* @brief functions to handle incoming requests for backups
* @author Christian Grothoff
*/
#include "platform.h"
#include "sync-httpd.h"
#include <gnunet/gnunet_util_lib.h>
#include "sync-httpd_backup.h"
/**
* Handle request on @a connection for retrieval of the latest
* backup of @a account.
*
* @param connection the MHD connection to handle
* @param account public key of the account the request is for
* @return MHD result code
*/
MHD_RESULT
SH_backup_get (struct MHD_Connection *connection,
const struct SYNC_AccountPublicKeyP *account)
{
struct GNUNET_HashCode backup_hash;
enum SYNC_DB_QueryStatus qs;
MHD_RESULT ret;
qs = db->lookup_account_TR (db->cls,
account,
&backup_hash);
switch (qs)
{
case SYNC_DB_OLD_BACKUP_MISSING:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
NULL);
case SYNC_DB_OLD_BACKUP_MISMATCH:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
NULL);
case SYNC_DB_PAYMENT_REQUIRED:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_SYNC_ACCOUNT_UNKNOWN,
NULL);
case SYNC_DB_HARD_ERROR:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_SYNC_DB_HARD_FETCH_ERROR,
NULL);
case SYNC_DB_SOFT_ERROR:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_SYNC_DB_SOFT_FETCH_ERROR,
NULL);
case SYNC_DB_NO_RESULTS:
{
struct MHD_Response *resp;
resp = MHD_create_response_from_buffer (0,
NULL,
MHD_RESPMEM_PERSISTENT);
TALER_MHD_add_global_headers (resp);
ret = MHD_queue_response (connection,
MHD_HTTP_NO_CONTENT,
resp);
MHD_destroy_response (resp);
}
return ret;
case SYNC_DB_ONE_RESULT:
{
const char *inm;
inm = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_IF_NONE_MATCH);
if (NULL != inm)
{
struct GNUNET_HashCode inm_h;
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (inm,
strlen (inm),
&inm_h,
sizeof (inm_h)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_SYNC_BAD_IF_NONE_MATCH,
"Etag does not include a base32-encoded SHA-512 hash");
}
if (0 == GNUNET_memcmp (&inm_h,
&backup_hash))
{
struct MHD_Response *resp;
resp = MHD_create_response_from_buffer (0,
NULL,
MHD_RESPMEM_PERSISTENT);
TALER_MHD_add_global_headers (resp);
ret = MHD_queue_response (connection,
MHD_HTTP_NOT_MODIFIED,
resp);
MHD_destroy_response (resp);
return ret;
}
}
}
/* We have a result, should fetch and return it! */
break;
}
return SH_return_backup (connection,
account,
MHD_HTTP_OK);
}
/**
* Return the current backup of @a account on @a connection
* using @a default_http_status on success.
*
* @param connection MHD connection to use
* @param account account to query
* @param default_http_status HTTP status to queue response
* with on success (#MHD_HTTP_OK or #MHD_HTTP_CONFLICT)
* @return MHD result code
*/
MHD_RESULT
SH_return_backup (struct MHD_Connection *connection,
const struct SYNC_AccountPublicKeyP *account,
unsigned int default_http_status)
{
enum SYNC_DB_QueryStatus qs;
struct MHD_Response *resp;
MHD_RESULT ret;
struct SYNC_AccountSignatureP account_sig;
struct GNUNET_HashCode backup_hash;
struct GNUNET_HashCode prev_hash;
size_t backup_size;
void *backup;
qs = db->lookup_backup_TR (db->cls,
account,
&account_sig,
&prev_hash,
&backup_hash,
&backup_size,
&backup);
switch (qs)
{
case SYNC_DB_OLD_BACKUP_MISSING:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
"unexpected return status (backup missing)");
case SYNC_DB_OLD_BACKUP_MISMATCH:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
"unexpected return status (backup mismatch)");
case SYNC_DB_PAYMENT_REQUIRED:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_INTERNAL_INVARIANT_FAILURE,
"unexpected return status (payment required)");
case SYNC_DB_HARD_ERROR:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_SYNC_DB_HARD_FETCH_ERROR,
NULL);
case SYNC_DB_SOFT_ERROR:
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_SYNC_DB_SOFT_FETCH_ERROR,
NULL);
case SYNC_DB_NO_RESULTS:
GNUNET_break (0);
/* Note: can theoretically happen due to non-transactional nature if
the backup expired / was gc'ed JUST between the two SQL calls.
But too rare to handle properly, as doing a transaction would be
expensive. Just admit to failure ;-) */
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_SYNC_DB_INCONSISTENT_FETCH_ERROR,
NULL);
case SYNC_DB_ONE_RESULT:
/* interesting case below */
break;
}
resp = MHD_create_response_from_buffer (backup_size,
backup,
MHD_RESPMEM_MUST_FREE);
TALER_MHD_add_global_headers (resp);
{
char *sig_s;
char *prev_s;
char *etag;
sig_s = GNUNET_STRINGS_data_to_string_alloc (&account_sig,
sizeof (account_sig));
prev_s = GNUNET_STRINGS_data_to_string_alloc (&prev_hash,
sizeof (prev_hash));
etag = GNUNET_STRINGS_data_to_string_alloc (&backup_hash,
sizeof (backup_hash));
GNUNET_break (MHD_YES ==
MHD_add_response_header (resp,
"Sync-Signature",
sig_s));
GNUNET_break (MHD_YES ==
MHD_add_response_header (resp,
"Sync-Previous",
prev_s));
GNUNET_break (MHD_YES ==
MHD_add_response_header (resp,
MHD_HTTP_HEADER_ETAG,
etag));
GNUNET_free (etag);
GNUNET_free (prev_s);
GNUNET_free (sig_s);
}
ret = MHD_queue_response (connection,
default_http_status,
resp);
MHD_destroy_response (resp);
return ret;
}
|
