Mercurial > hg > nginx
annotate src/http/modules/ngx_http_random_index_module.c @ 2266:6223d5a9e87f
back out $random_index variable
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 30 Sep 2008 13:17:14 +0000 |
| parents | 5b4680865e68 |
| 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 } |