Mercurial > hg > nginx
annotate src/http/modules/ngx_http_random_index_module.c @ 2412:086c20fe2e97
set default gzip_buffers to 32 4k or 16 8k
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 16 Dec 2008 16:15:52 +0000 |
parents | 6223d5a9e87f |
children | 8e720b7fe6d2 |
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 /* TODO: Win32 */ | |
90 if (r->zero_in_uri) { | |
91 return NGX_DECLINED; | |
92 } | |
93 | |
94 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) { | |
95 return NGX_DECLINED; | |
96 } | |
97 | |
98 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module); | |
99 | |
100 if (!rlcf->enable) { | |
101 return NGX_DECLINED; | |
102 } | |
103 | |
104 #if (NGX_HAVE_D_TYPE) | |
105 len = NGX_DIR_MASK_LEN; | |
106 #else | |
107 len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE; | |
108 #endif | |
109 | |
110 last = ngx_http_map_uri_to_path(r, &path, &root, len); | |
111 if (last == NULL) { | |
112 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
113 } | |
114 | |
115 allocated = path.len; | |
116 | |
117 path.len = last - path.data - 1; | |
118 path.data[path.len] = '\0'; | |
119 | |
120 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
121 "http random index: \"%s\"", path.data); | |
122 | |
123 if (ngx_open_dir(&path, &dir) == NGX_ERROR) { | |
124 err = ngx_errno; | |
125 | |
126 if (err == NGX_ENOENT | |
127 || err == NGX_ENOTDIR | |
128 || err == NGX_ENAMETOOLONG) | |
129 { | |
130 level = NGX_LOG_ERR; | |
131 rc = NGX_HTTP_NOT_FOUND; | |
132 | |
133 } else if (err == NGX_EACCES) { | |
134 level = NGX_LOG_ERR; | |
135 rc = NGX_HTTP_FORBIDDEN; | |
136 | |
137 } else { | |
138 level = NGX_LOG_CRIT; | |
139 rc = NGX_HTTP_INTERNAL_SERVER_ERROR; | |
140 } | |
141 | |
142 ngx_log_error(level, r->connection->log, err, | |
143 ngx_open_dir_n " \"%s\" failed", path.data); | |
144 | |
145 return rc; | |
146 } | |
147 | |
148 if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) { | |
149 return ngx_http_random_index_error(r, &dir, &path); | |
150 } | |
151 | |
152 filename = path.data; | |
153 filename[path.len] = '/'; | |
154 | |
155 for ( ;; ) { | |
156 ngx_set_errno(0); | |
157 | |
158 if (ngx_read_dir(&dir) == NGX_ERROR) { | |
159 err = ngx_errno; | |
160 | |
161 if (err != NGX_ENOMOREFILES) { | |
162 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err, | |
163 ngx_read_dir_n " \"%V\" failed", &path); | |
164 return ngx_http_random_index_error(r, &dir, &path); | |
165 } | |
166 | |
167 break; | |
168 } | |
169 | |
170 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
171 "http random index file: \"%s\"", ngx_de_name(&dir)); | |
172 | |
173 if (ngx_de_name(&dir)[0] == '.') { | |
174 continue; | |
175 } | |
176 | |
177 len = ngx_de_namelen(&dir); | |
178 | |
179 if (!dir.valid_type) { | |
180 | |
181 /* 1 byte for '/' and 1 byte for terminating '\0' */ | |
182 | |
183 if (path.len + 1 + len + 1 > allocated) { | |
184 allocated = path.len + 1 + len + 1 | |
185 + NGX_HTTP_RANDOM_INDEX_PREALLOCATE; | |
186 | |
187 filename = ngx_pnalloc(r->pool, allocated); | |
188 if (filename == NULL) { | |
189 return ngx_http_random_index_error(r, &dir, &path); | |
190 } | |
191 | |
192 last = ngx_cpystrn(filename, path.data, path.len + 1); | |
193 *last++ = '/'; | |
194 } | |
195 | |
196 ngx_cpystrn(last, ngx_de_name(&dir), len + 1); | |
197 | |
198 if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) { | |
199 err = ngx_errno; | |
200 | |
201 if (err != NGX_ENOENT) { | |
202 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err, | |
203 ngx_de_info_n " \"%s\" failed", filename); | |
204 return ngx_http_random_index_error(r, &dir, &path); | |
205 } | |
206 | |
207 if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) { | |
208 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno, | |
209 ngx_de_link_info_n " \"%s\" failed", | |
210 filename); | |
211 return ngx_http_random_index_error(r, &dir, &path); | |
212 } | |
213 } | |
214 } | |
215 | |
216 if (!ngx_de_is_file(&dir)) { | |
217 continue; | |
218 } | |
219 | |
220 name = ngx_array_push(&names); | |
221 if (name == NULL) { | |
222 return ngx_http_random_index_error(r, &dir, &path); | |
223 } | |
224 | |
225 name->len = len; | |
226 | |
227 name->data = ngx_pnalloc(r->pool, len); | |
228 if (name->data == NULL) { | |
229 return ngx_http_random_index_error(r, &dir, &path); | |
230 } | |
231 | |
232 ngx_memcpy(name->data, ngx_de_name(&dir), len); | |
233 } | |
234 | |
235 if (ngx_close_dir(&dir) == NGX_ERROR) { | |
236 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno, | |
237 ngx_close_dir_n " \"%s\" failed", &path); | |
238 } | |
239 | |
240 n = names.nelts; | |
241 | |
242 if (n == 0) { | |
243 return NGX_DECLINED; | |
244 } | |
245 | |
246 name = names.elts; | |
247 | |
248 n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000); | |
249 | |
250 uri.len = r->uri.len + name[n].len; | |
251 | |
252 uri.data = ngx_pnalloc(r->pool, uri.len); | |
253 if (uri.data == NULL) { | |
254 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
255 } | |
256 | |
257 last = ngx_copy(uri.data, r->uri.data, r->uri.len); | |
258 ngx_memcpy(last, name[n].data, name[n].len); | |
259 | |
260 return ngx_http_internal_redirect(r, &uri, &r->args); | |
261 } | |
262 | |
263 | |
264 static ngx_int_t | |
265 ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir, | |
266 ngx_str_t *name) | |
267 { | |
268 if (ngx_close_dir(dir) == NGX_ERROR) { | |
269 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno, | |
270 ngx_close_dir_n " \"%V\" failed", name); | |
271 } | |
272 | |
273 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
274 } | |
275 | |
276 | |
277 static void * | |
278 ngx_http_random_index_create_loc_conf(ngx_conf_t *cf) | |
279 { | |
280 ngx_http_random_index_loc_conf_t *conf; | |
281 | |
282 conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t)); | |
283 if (conf == NULL) { | |
284 return NGX_CONF_ERROR; | |
285 } | |
286 | |
287 conf->enable = NGX_CONF_UNSET; | |
288 | |
289 return conf; | |
290 } | |
291 | |
292 | |
293 static char * | |
294 ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
295 { | |
296 ngx_http_random_index_loc_conf_t *prev = parent; | |
297 ngx_http_random_index_loc_conf_t *conf = child; | |
298 | |
299 ngx_conf_merge_value(conf->enable, prev->enable, 0); | |
300 | |
301 return NGX_CONF_OK; | |
302 } | |
303 | |
304 | |
305 static ngx_int_t | |
306 ngx_http_random_index_init(ngx_conf_t *cf) | |
307 { | |
308 ngx_http_handler_pt *h; | |
309 ngx_http_core_main_conf_t *cmcf; | |
310 | |
311 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
312 | |
313 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers); | |
314 if (h == NULL) { | |
315 return NGX_ERROR; | |
316 } | |
317 | |
318 *h = ngx_http_random_index_handler; | |
319 | |
320 return NGX_OK; | |
321 } |