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
|
/**
* part of Hydrilla
* Serving data queries over HTTP using libmicrohttpd.
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*
* This file is based on Christian Grothoff's public comain code from
* `doc/examples/logging.c' in libmicrohttpd source tree.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <microhttpd.h>
#include "scriptbase.h"
#define PORT 10111
#define ARRLEN(array) (sizeof(array) / sizeof(*array))
static struct MHD_Response *default_response, *error_response,
*not_found_response;
static struct {
struct MHD_Response **response;
const char *const text;
} static_responses[] = {
{&default_response, "<html><body>Nothing to see here</body></html>"},
{&error_response, "<html><body>Error occured</body></html>"},
{¬_found_response, "<html><body>Not found</body></html>"}
};
static int add_CORS_header(struct MHD_Response *response)
{
return -1 * (MHD_add_response_header(response,
"Access-Control-Allow-Origin",
"*") == MHD_NO);
}
typedef char *(*request_handler_t)(const char *queried,
struct scriptbase *base);
static struct {
const char *path;
request_handler_t request_handler;
} resources[] = {
{"/script", get_script_json},
{"/bag", get_bag_json},
{"/pattern", get_pattern_json},
{"/query", get_page_query_json}
};
struct request_handling {
struct scriptbase *base;
request_handler_t handler;
char *json_response;
int error_number;
};
static int handle_query_argument(void *cls, enum MHD_ValueKind kind,
const char *key, const char *value)
{
struct request_handling *handling = cls;
if (strcmp(key, "n")) {
fprintf(stderr, "Unknown argument: \"%s\" = \"%s\"\n",
key, value);
return MHD_YES;
}
errno = 0;
handling->json_response = handling->handler(value, handling->base);
handling->error_number = errno;
return MHD_NO;
}
static int answer_with(struct MHD_Connection *connection,
request_handler_t handler, struct scriptbase *base)
{
struct request_handling handling = {base, handler, NULL, EINVAL};
struct MHD_Response *response;
int retval;
MHD_get_connection_values(connection, MHD_GET_ARGUMENT_KIND,
handle_query_argument, &handling);
if (!handling.json_response) {
if (handling.error_number)
goto send_error;
goto send_not_found;
}
response = MHD_create_response_from_buffer
(strlen(handling.json_response), handling.json_response,
MHD_RESPMEM_MUST_FREE);
if (!response || add_CORS_header(response))
goto send_error;
retval = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return retval;
send_not_found:
return MHD_queue_response(connection, MHD_HTTP_NOT_FOUND,
not_found_response);
send_error:
free(handling.json_response);
return MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
error_response);
}
static int answer(void *data,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr)
{
static int aptr;
int i;
struct scriptbase *base = data;
printf("New %s request for %s using version %s\n", method, url, version);
if (strcmp(method, "GET"))
return MHD_NO;
if (&aptr != *ptr) {
/* do never respond on first call */
*ptr = &aptr;
return MHD_YES;
}
*ptr = NULL; /* reset when done */
for (i = 0; i < ARRLEN(resources); i++) {
if (strcmp(resources[i].path, url))
continue;
return answer_with(connection, resources[i].request_handler,
base);
}
return MHD_queue_response(connection, MHD_HTTP_OK, default_response);
}
int getchar(void);
int serve_scriptbase(struct scriptbase *base)
{
int i;
struct MHD_Daemon *daemon;
int retval = -1;
if (init_url_lookup_regex())
return -1;
for (i = 0; i < ARRLEN(static_responses); i++) {
*static_responses[i].response = MHD_create_response_from_buffer
(strlen(static_responses[i].text),
(char*) static_responses[i].text,
MHD_RESPMEM_PERSISTENT);
if (!*static_responses[i].response ||
add_CORS_header(*static_responses[i].response))
goto free_resources;
}
daemon = MHD_start_daemon(MHD_USE_INTERNAL_POLLING_THREAD, PORT, NULL,
NULL, &answer, (void*) base, MHD_OPTION_END);
if (!daemon)
goto free_resources;
getchar();
MHD_stop_daemon(daemon);
retval = 0;
free_resources:
for (i = 0; i < ARRLEN(static_responses); i++) {
if (*static_responses[i].response)
MHD_destroy_response(*static_responses[i].response);
*static_responses[i].response = NULL;
}
destroy_url_lookup_regex();
return retval;
}
|
