Mercurial > hg > nginx
annotate src/http/modules/ngx_http_random_index_module.c @ 3789:19c931be8b98
allow expressions in the first "map" parameter
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 25 Nov 2010 15:22:43 +0000 |
parents | 84905c7b2aa7 |
children | d620f497c50f |
rev | line source |
---|---|
2235 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_http.h> | |
10 | |
11 | |
12 typedef struct { | |
13 ngx_flag_t enable; | |
14 } ngx_http_random_index_loc_conf_t; | |
15 | |
16 | |
17 #define NGX_HTTP_RANDOM_INDEX_PREALLOCATE 50 | |
18 | |
19 | |
20 static ngx_int_t ngx_http_random_index_error(ngx_http_request_t *r, | |
21 ngx_dir_t *dir, ngx_str_t *name); | |
2266
6223d5a9e87f
back out $random_index variable
Igor Sysoev <igor@sysoev.ru>
parents:
2258
diff
changeset
|
22 static ngx_int_t ngx_http_random_index_init(ngx_conf_t *cf); |
2235 | 23 static void *ngx_http_random_index_create_loc_conf(ngx_conf_t *cf); |
24 static char *ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, | |
25 void *parent, void *child); | |
26 | |
27 | |
28 static ngx_command_t ngx_http_random_index_commands[] = { | |
29 | |
30 { ngx_string("random_index"), | |
31 NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, | |
32 ngx_conf_set_flag_slot, | |
33 NGX_HTTP_LOC_CONF_OFFSET, | |
34 offsetof(ngx_http_random_index_loc_conf_t, enable), | |
35 NULL }, | |
36 | |
37 ngx_null_command | |
38 }; | |
39 | |
40 | |
41 static ngx_http_module_t ngx_http_random_index_module_ctx = { | |
2266
6223d5a9e87f
back out $random_index variable
Igor Sysoev <igor@sysoev.ru>
parents:
2258
diff
changeset
|
42 NULL, /* preconfiguration */ |
2235 | 43 ngx_http_random_index_init, /* postconfiguration */ |
44 | |
45 NULL, /* create main configuration */ | |
46 NULL, /* init main configuration */ | |
47 | |
48 NULL, /* create server configuration */ | |
49 NULL, /* merge server configuration */ | |
50 | |
51 ngx_http_random_index_create_loc_conf, /* create location configration */ | |
52 ngx_http_random_index_merge_loc_conf /* merge location configration */ | |
53 }; | |
54 | |
55 | |
56 ngx_module_t ngx_http_random_index_module = { | |
57 NGX_MODULE_V1, | |
58 &ngx_http_random_index_module_ctx, /* module context */ | |
59 ngx_http_random_index_commands, /* module directives */ | |
60 NGX_HTTP_MODULE, /* module type */ | |
61 NULL, /* init master */ | |
62 NULL, /* init module */ | |
63 NULL, /* init process */ | |
64 NULL, /* init thread */ | |
65 NULL, /* exit thread */ | |
66 NULL, /* exit process */ | |
67 NULL, /* exit master */ | |
68 NGX_MODULE_V1_PADDING | |
69 }; | |
70 | |
71 | |
72 static ngx_int_t | |
73 ngx_http_random_index_handler(ngx_http_request_t *r) | |
74 { | |
75 u_char *last, *filename; | |
76 size_t len, allocated, root; | |
77 ngx_err_t err; | |
78 ngx_int_t rc; | |
79 ngx_str_t path, uri, *name; | |
80 ngx_dir_t dir; | |
81 ngx_uint_t n, level; | |
82 ngx_array_t names; | |
83 ngx_http_random_index_loc_conf_t *rlcf; | |
84 | |
85 if (r->uri.data[r->uri.len - 1] != '/') { | |
86 return NGX_DECLINED; | |
87 } | |
88 | |
89 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) { | |
90 return NGX_DECLINED; | |
91 } | |
92 | |
93 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module); | |
94 | |
95 if (!rlcf->enable) { | |
96 return NGX_DECLINED; | |
97 } | |
98 | |
99 #if (NGX_HAVE_D_TYPE) | |
100 len = NGX_DIR_MASK_LEN; | |
101 #else | |
102 len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE; | |
103 #endif | |
104 | |
105 last = ngx_http_map_uri_to_path(r, &path, &root, len); | |
106 if (last == NULL) { | |
107 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
108 } | |
109 | |
110 allocated = path.len; | |
111 | |
112 path.len = last - path.data - 1; | |
113 path.data[path.len] = '\0'; | |
114 | |
115 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
116 "http random index: \"%s\"", path.data); | |
117 | |
118 if (ngx_open_dir(&path, &dir) == NGX_ERROR) { | |
119 err = ngx_errno; | |
120 | |
121 if (err == NGX_ENOENT | |
122 || err == NGX_ENOTDIR | |
123 || err == NGX_ENAMETOOLONG) | |
124 { | |
125 level = NGX_LOG_ERR; | |
126 rc = NGX_HTTP_NOT_FOUND; | |
127 | |
128 } else if (err == NGX_EACCES) { | |
129 level = NGX_LOG_ERR; | |
130 rc = NGX_HTTP_FORBIDDEN; | |
131 | |
132 } else { | |
133 level = NGX_LOG_CRIT; | |
134 rc = NGX_HTTP_INTERNAL_SERVER_ERROR; | |
135 } | |
136 | |
137 ngx_log_error(level, r->connection->log, err, | |
138 ngx_open_dir_n " \"%s\" failed", path.data); | |
139 | |
140 return rc; | |
141 } | |
142 | |
143 if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) { | |
144 return ngx_http_random_index_error(r, &dir, &path); | |
145 } | |
146 | |
147 filename = path.data; | |
148 filename[path.len] = '/'; | |
149 | |
150 for ( ;; ) { | |
151 ngx_set_errno(0); | |
152 | |
153 if (ngx_read_dir(&dir) == NGX_ERROR) { | |
154 err = ngx_errno; | |
155 | |
156 if (err != NGX_ENOMOREFILES) { | |
157 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err, | |
158 ngx_read_dir_n " \"%V\" failed", &path); | |
159 return ngx_http_random_index_error(r, &dir, &path); | |
160 } | |
161 | |
162 break; | |
163 } | |
164 | |
165 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
166 "http random index file: \"%s\"", ngx_de_name(&dir)); | |
167 | |
168 if (ngx_de_name(&dir)[0] == '.') { | |
169 continue; | |
170 } | |
171 | |
172 len = ngx_de_namelen(&dir); | |
173 | |
3203
a56cccd588e6
update r3201: ngx_http_random_index_module should behave consistently
Igor Sysoev <igor@sysoev.ru>
parents:
3200
diff
changeset
|
174 if (dir.type == 0 || ngx_de_is_link(&dir)) { |
2235 | 175 |
176 /* 1 byte for '/' and 1 byte for terminating '\0' */ | |
177 | |
178 if (path.len + 1 + len + 1 > allocated) { | |
179 allocated = path.len + 1 + len + 1 | |
180 + NGX_HTTP_RANDOM_INDEX_PREALLOCATE; | |
181 | |
182 filename = ngx_pnalloc(r->pool, allocated); | |
183 if (filename == NULL) { | |
184 return ngx_http_random_index_error(r, &dir, &path); | |
185 } | |
186 | |
187 last = ngx_cpystrn(filename, path.data, path.len + 1); | |
188 *last++ = '/'; | |
189 } | |
190 | |
191 ngx_cpystrn(last, ngx_de_name(&dir), len + 1); | |
192 | |
193 if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) { | |
194 err = ngx_errno; | |
195 | |
196 if (err != NGX_ENOENT) { | |
197 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err, | |
198 ngx_de_info_n " \"%s\" failed", filename); | |
199 return ngx_http_random_index_error(r, &dir, &path); | |
200 } | |
201 | |
202 if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) { | |
203 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno, | |
204 ngx_de_link_info_n " \"%s\" failed", | |
205 filename); | |
206 return ngx_http_random_index_error(r, &dir, &path); | |
207 } | |
208 } | |
209 } | |
210 | |
211 if (!ngx_de_is_file(&dir)) { | |
212 continue; | |
213 } | |
214 | |
215 name = ngx_array_push(&names); | |
216 if (name == NULL) { | |
217 return ngx_http_random_index_error(r, &dir, &path); | |
218 } | |
219 | |
220 name->len = len; | |
221 | |
222 name->data = ngx_pnalloc(r->pool, len); | |
223 if (name->data == NULL) { | |
224 return ngx_http_random_index_error(r, &dir, &path); | |
225 } | |
226 | |
227 ngx_memcpy(name->data, ngx_de_name(&dir), len); | |
228 } | |
229 | |
230 if (ngx_close_dir(&dir) == NGX_ERROR) { | |
231 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno, | |
232 ngx_close_dir_n " \"%s\" failed", &path); | |
233 } | |
234 | |
235 n = names.nelts; | |
236 | |
237 if (n == 0) { | |
238 return NGX_DECLINED; | |
239 } | |
240 | |
241 name = names.elts; | |
242 | |
243 n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000); | |
244 | |
245 uri.len = r->uri.len + name[n].len; | |
246 | |
247 uri.data = ngx_pnalloc(r->pool, uri.len); | |
248 if (uri.data == NULL) { | |
249 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
250 } | |
251 | |
252 last = ngx_copy(uri.data, r->uri.data, r->uri.len); | |
253 ngx_memcpy(last, name[n].data, name[n].len); | |
254 | |
255 return ngx_http_internal_redirect(r, &uri, &r->args); | |
256 } | |
257 | |
258 | |
259 static ngx_int_t | |
260 ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir, | |
261 ngx_str_t *name) | |
262 { | |
263 if (ngx_close_dir(dir) == NGX_ERROR) { | |
264 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno, | |
265 ngx_close_dir_n " \"%V\" failed", name); | |
266 } | |
267 | |
268 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
269 } | |
270 | |
271 | |
272 static void * | |
273 ngx_http_random_index_create_loc_conf(ngx_conf_t *cf) | |
274 { | |
275 ngx_http_random_index_loc_conf_t *conf; | |
276 | |
277 conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t)); | |
278 if (conf == NULL) { | |
2912
c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
Igor Sysoev <igor@sysoev.ru>
parents:
2721
diff
changeset
|
279 return NULL; |
2235 | 280 } |
281 | |
282 conf->enable = NGX_CONF_UNSET; | |
283 | |
284 return conf; | |
285 } | |
286 | |
287 | |
288 static char * | |
289 ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
290 { | |
291 ngx_http_random_index_loc_conf_t *prev = parent; | |
292 ngx_http_random_index_loc_conf_t *conf = child; | |
293 | |
294 ngx_conf_merge_value(conf->enable, prev->enable, 0); | |
295 | |
296 return NGX_CONF_OK; | |
297 } | |
298 | |
299 | |
300 static ngx_int_t | |
301 ngx_http_random_index_init(ngx_conf_t *cf) | |
302 { | |
303 ngx_http_handler_pt *h; | |
304 ngx_http_core_main_conf_t *cmcf; | |
305 | |
306 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
307 | |
308 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers); | |
309 if (h == NULL) { | |
310 return NGX_ERROR; | |
311 } | |
312 | |
313 *h = ngx_http_random_index_handler; | |
314 | |
315 return NGX_OK; | |
316 } |