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
|
/*
This file is part of TALER
(C) 2014, 2015, 2016 INRIA
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 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, see <http://www.gnu.org/licenses/>
*/
/**
* @file backend/taler-merchant-httpd_map.c
* @brief Provides the frontend the mean to store plain contracts in database
* @author Marcello Stanisci
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_signatures.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_responses.h"
#include "taler-merchant-httpd_parsing.h"
/**
* Information we keep for individual calls
* to requests that parse JSON, but keep no other state.
*/
struct TMH_JsonParseContext
{
/**
* This field MUST be first.
* FIXME: Explain why!
*/
struct TM_HandlerContext hc;
/**
* Placeholder for #TMH_PARSE_post_json() to keep its internal state.
*/
void *json_parse_context;
};
/**
* Custom cleanup routine for a `struct TMH_JsonParseContext`.
*
* @param hc the `struct TMH_JsonParseContext` to clean up.
*/
static void
json_parse_cleanup (struct TM_HandlerContext *hc)
{
struct TMH_JsonParseContext *jpc = (struct TMH_JsonParseContext *) hc;
TMH_PARSE_post_cleanup_callback (jpc->json_parse_context);
GNUNET_free (jpc);
}
/**
* Manage a /map/in request. Store in db a plain text contract
* and its hashcode.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] connection_cls the connection's closure (can be updated)
* @param upload_data upload data
* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
* @return MHD result code
*/
int
MH_handler_map_in (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
int res;
json_t *root;
json_t *contract;
struct GNUNET_HashCode h_contract;
struct GNUNET_HashCode tmp;
struct TMH_JsonParseContext *ctx;
struct MHD_Response *response;
/* Fetch body */
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("contract", &contract),
GNUNET_JSON_spec_fixed_auto ("h_contract", &h_contract),
GNUNET_JSON_spec_end ()
};
if (NULL == *connection_cls)
{
ctx = GNUNET_new (struct TMH_JsonParseContext);
ctx->hc.cc = &json_parse_cleanup;
*connection_cls = ctx;
}
else
{
ctx = *connection_cls;
}
res = TMH_PARSE_post_json (connection,
&ctx->json_parse_context,
upload_data,
upload_data_size,
&root);
if (GNUNET_SYSERR == res)
return MHD_NO;
/* the POST's body has to be further fetched */
if ((GNUNET_NO == res) || (NULL == root))
return MHD_YES;
res = TMH_PARSE_json_data (connection,
root,
spec);
if (GNUNET_NO == res)
{
json_decref (root);
return MHD_YES;
}
if (GNUNET_SYSERR == res)
{
json_decref (root);
return TMH_RESPONSE_reply_internal_error (connection,
TALER_EC_NONE,
"Impossible to parse JSON");
}
/* Sanity checks */
if (GNUNET_SYSERR ==
TALER_JSON_hash (contract,
&tmp))
return TMH_RESPONSE_reply_invalid_json (connection);
/**
* Check hashes match. This check does NOT detect invalid
* contracts though.
*/
if (0 != memcmp (&tmp,
&h_contract,
sizeof (struct GNUNET_HashCode)))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"'h_contract' does not match 'contract'\n");
return TMH_RESPONSE_reply_json_pack
(connection,
MHD_HTTP_UNPROCESSABLE_ENTITY,
"{s:I, s:s}",
"code", (json_int_t) TALER_EC_MAP_IN_UNMATCHED_HASH,
"error", "field 'h_contract' is not hash of 'contract'");
}
/* Store body */
if (GNUNET_OK != db->store_map (db->cls,
&h_contract,
contract))
{
return TMH_RESPONSE_reply_internal_error (connection,
TALER_EC_MAP_IN_STORE_DB_ERROR,
"Could not store data into db");
}
response = MHD_create_response_from_buffer (0, NULL, MHD_RESPMEM_PERSISTENT);
return MHD_queue_response (connection, MHD_HTTP_OK, response);
}
/**
* Manage a /map/out request. Query the db and returns a plain
* text contract associated with the hashcode given as input
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] connection_cls the connection's closure (can be updated)
* @param upload_data upload data
* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
* @return MHD result code
*/
int
MH_handler_map_out (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
const char *h_contract_enc;
struct GNUNET_HashCode h_contract;
int res;
json_t *contract;
h_contract_enc = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"h_contract");
if (NULL == h_contract_enc)
return TMH_RESPONSE_reply_arg_missing (connection,
TALER_EC_PARAMETER_MISSING,
"h_contract");
if (GNUNET_OK != GNUNET_STRINGS_string_to_data (h_contract_enc,
strlen (h_contract_enc),
&h_contract,
sizeof (h_contract)))
{
GNUNET_break_op (0);
return TMH_RESPONSE_reply_bad_request (connection,
TALER_EC_PARAMETER_MALFORMED,
"Could not decode hashcode into binary form");
}
res = db->find_contract (db->cls,
&contract,
&h_contract);
if (GNUNET_SYSERR == res)
{
return TMH_RESPONSE_reply_internal_error (connection,
TALER_EC_MAP_OUT_GET_FROM_DB_ERROR,
"Could not retrieve data from db");
}
if (GNUNET_NO == res)
{
return TMH_RESPONSE_reply_not_found (connection,
TALER_EC_MAP_OUT_CONTRACT_UNKNOWN,
"contract");
}
return TMH_RESPONSE_reply_json (connection,
contract,
MHD_HTTP_OK);
}
/* end of taler-merchant-httpd_history.c */
|
