1 #include "first.h" 2 3 #include "base.h" 4 #include "array.h" 5 #include "buffer.h" 6 #include "log.h" 7 #include "http_date.h" 8 #include "http_header.h" 9 10 #include "plugin.h" 11 #include "stat_cache.h" 12 13 #include "sys-time.h" 14 #include <stdlib.h> 15 #include <string.h> 16 17 /** 18 * set HTTP headers Cache-Control and Expires 19 */ 20 21 typedef struct { 22 const array *expire_url; 23 const array *expire_mimetypes; 24 } plugin_config; 25 26 typedef struct { 27 PLUGIN_DATA; 28 plugin_config defaults; 29 plugin_config conf; 30 time_t *toffsets; 31 uint32_t tused; 32 } plugin_data; 33 34 INIT_FUNC(mod_expire_init) { 35 return calloc(1, sizeof(plugin_data)); 36 } 37 38 FREE_FUNC(mod_expire_free) { 39 plugin_data * const p = p_d; 40 free(p->toffsets); 41 } 42 43 static time_t mod_expire_get_offset(log_error_st *errh, const buffer *expire, time_t *offset) { 44 char *ts; 45 time_t type; 46 time_t retts = 0; 47 48 /* 49 * parse 50 * 51 * '(access|now|modification) [plus] {<num> <type>}*' 52 * 53 * e.g. 'access 1 years' 54 */ 55 56 if (buffer_is_blank(expire)) { 57 log_error(errh, __FILE__, __LINE__, "mod_expire empty string"); 58 return -1; 59 } 60 61 ts = expire->ptr; 62 63 if (0 == strncmp(ts, "access ", 7)) { 64 type = 0; 65 ts += 7; 66 } else if (0 == strncmp(ts, "now ", 4)) { 67 type = 0; 68 ts += 4; 69 } else if (0 == strncmp(ts, "modification ", 13)) { 70 type = 1; 71 ts += 13; 72 } else { 73 /* invalid type-prefix */ 74 log_error(errh, __FILE__, __LINE__, "invalid <base>: %s", ts); 75 return -1; 76 } 77 78 if (0 == strncmp(ts, "plus ", 5)) { 79 /* skip the optional plus */ 80 ts += 5; 81 } 82 83 /* the rest is just <number> (years|months|weeks|days|hours|minutes|seconds) */ 84 do { 85 char *space, *err; 86 int num; 87 88 if (NULL == (space = strchr(ts, ' '))) { 89 log_error(errh, __FILE__, __LINE__, 90 "missing space after <num>: %s", ts); 91 return -1; 92 } 93 94 num = strtol(ts, &err, 10); 95 if (*err != ' ') { 96 log_error(errh, __FILE__, __LINE__, 97 "missing <type> after <num>: %s", ts); 98 return -1; 99 } 100 101 ts = space + 1; 102 103 if (NULL == (space = strchr(ts, ' '))) 104 space = expire->ptr + buffer_clen(expire); 105 106 { 107 int slen; 108 /* */ 109 110 slen = space - ts; 111 if (ts[slen-1] == 's') --slen; /* strip plural */ 112 113 if (slen == 4 && 0 == strncmp(ts, "year", slen)) 114 num *= 60 * 60 * 24 * 30 * 12; 115 else if (slen == 5 && 0 == strncmp(ts, "month", slen)) 116 num *= 60 * 60 * 24 * 30; 117 else if (slen == 4 && 0 == strncmp(ts, "week", slen)) 118 num *= 60 * 60 * 24 * 7; 119 else if (slen == 3 && 0 == strncmp(ts, "day", slen)) 120 num *= 60 * 60 * 24; 121 else if (slen == 4 && 0 == strncmp(ts, "hour", slen)) 122 num *= 60 * 60; 123 else if (slen == 6 && 0 == strncmp(ts, "minute", slen)) 124 num *= 60; 125 else if (slen == 6 && 0 == strncmp(ts, "second", slen)) 126 num *= 1; 127 else { 128 log_error(errh, __FILE__, __LINE__, "unknown type: %s", ts); 129 return -1; 130 } 131 132 retts += num; 133 134 if (*space == '\0') break; 135 ts = space + 1; 136 } 137 } while (*ts); 138 139 *offset = retts; 140 141 return type; 142 } 143 144 static void mod_expire_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) { 145 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 146 case 0: /* expire.url */ 147 pconf->expire_url = cpv->v.a; 148 break; 149 case 1: /* expire.mimetypes */ 150 pconf->expire_mimetypes = cpv->v.a; 151 break; 152 default:/* should not happen */ 153 return; 154 } 155 } 156 157 static void mod_expire_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) { 158 do { 159 mod_expire_merge_config_cpv(pconf, cpv); 160 } while ((++cpv)->k_id != -1); 161 } 162 163 static void mod_expire_patch_config(request_st * const r, plugin_data * const p) { 164 p->conf = p->defaults; /* copy small struct instead of memcpy() */ 165 /*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/ 166 for (int i = 1, used = p->nconfig; i < used; ++i) { 167 if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id)) 168 mod_expire_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]); 169 } 170 } 171 172 SETDEFAULTS_FUNC(mod_expire_set_defaults) { 173 static const config_plugin_keys_t cpk[] = { 174 { CONST_STR_LEN("expire.url"), 175 T_CONFIG_ARRAY_KVSTRING, 176 T_CONFIG_SCOPE_CONNECTION } 177 ,{ CONST_STR_LEN("expire.mimetypes"), 178 T_CONFIG_ARRAY_KVSTRING, 179 T_CONFIG_SCOPE_CONNECTION } 180 ,{ NULL, 0, 181 T_CONFIG_UNSET, 182 T_CONFIG_SCOPE_UNSET } 183 }; 184 185 plugin_data * const p = p_d; 186 if (!config_plugin_values_init(srv, p, cpk, "mod_expire")) 187 return HANDLER_ERROR; 188 189 /* process and validate config directives 190 * (init i to 0 if global context; to 1 to skip empty global context) */ 191 for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) { 192 const config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0]; 193 for (; -1 != cpv->k_id; ++cpv) { 194 const array *a = NULL; 195 switch (cpv->k_id) { 196 case 0: /* expire.url */ 197 a = cpv->v.a; 198 break; 199 case 1: /* expire.mimetypes */ 200 for (uint32_t k = 0; k < cpv->v.a->used; ++k) { 201 data_string *ds = (data_string *)cpv->v.a->data[k]; 202 /*(omit trailing '*', if present, from prefix match)*/ 203 /*(not usually a good idea to modify array keys 204 * since doing so might break array_get_element_klen() 205 * search; config should be consistent in using * or not)*/ 206 size_t klen = buffer_clen(&ds->key); 207 if (klen && ds->key.ptr[klen-1] == '*') 208 buffer_truncate(&ds->key, klen-1); 209 } 210 a = cpv->v.a; 211 break; 212 default:/* should not happen */ 213 break; 214 } 215 216 /* parse array values into structured data */ 217 if (NULL != a && a->used) { 218 p->toffsets = 219 realloc(p->toffsets, sizeof(time_t) * (p->tused + a->used*2)); 220 time_t *toff = p->toffsets + p->tused; 221 for (uint32_t k = 0; k < a->used; ++k, toff+=2, p->tused+=2) { 222 buffer *v = &((data_string *)a->data[k])->value; 223 *toff = mod_expire_get_offset(srv->errh, v, toff+1); 224 if (-1 == *toff) { 225 log_error(srv->errh, __FILE__, __LINE__, 226 "parsing %s failed: %s", cpk[cpv->k_id].k, v->ptr); 227 return HANDLER_ERROR; 228 } 229 /* overwrite v->used with offset int p->toffsets 230 * as v->ptr is not used by this module after config */ 231 v->used = (uint32_t)p->tused; 232 } 233 } 234 } 235 } 236 237 /* initialize p->defaults from global config context */ 238 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 239 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 240 if (-1 != cpv->k_id) 241 mod_expire_merge_config(&p->defaults, cpv); 242 } 243 244 return HANDLER_GO_ON; 245 } 246 247 static handler_t 248 mod_expire_set_header (request_st * const r, const time_t * const off) 249 { 250 const unix_time64_t cur_ts = log_epoch_secs; 251 unix_time64_t expires = off[1]; 252 if (0 == off[0]) { /* access */ 253 expires += cur_ts; 254 } 255 else { /* modification */ 256 const stat_cache_st * const st = stat_cache_path_stat(&r->physical.path); 257 /* can't set modification-based expire if mtime is not available */ 258 if (NULL == st) return HANDLER_GO_ON; 259 expires += TIME64_CAST(st->st_mtime); 260 } 261 262 /* expires should be at least cur_ts */ 263 if (expires < cur_ts) expires = cur_ts; 264 265 /* HTTP/1.1 dictates that Cache-Control overrides Expires if both present. 266 * Therefore, send only Cache-Control to HTTP/1.1 requests. This means 267 * that if an intermediary upgraded the request to HTTP/1.1, and the actual 268 * client sent HTTP/1.0, then the actual client might not understand 269 * Cache-Control when it may have understood Expires. RFC 2616 HTTP/1.1 270 * was released June 1999, almost 22 years ago (as this comment is written). 271 * If a client today is sending HTTP/1.0, chances are the client does not 272 * cache. Avoid the overhead of formatting time for Expires to send both 273 * Cache-Control and Expires when the majority of clients are HTTP/1.1 or 274 * HTTP/2 (or later). */ 275 buffer *vb; 276 if (r->http_version > HTTP_VERSION_1_0) { 277 vb = http_header_response_set_ptr(r, HTTP_HEADER_CACHE_CONTROL, 278 CONST_STR_LEN("Cache-Control")); 279 buffer_append_string_len(vb, CONST_STR_LEN("max-age=")); 280 buffer_append_int(vb, expires - cur_ts); 281 } 282 else { /* HTTP/1.0 */ 283 vb = http_header_response_set_ptr(r, HTTP_HEADER_EXPIRES, 284 CONST_STR_LEN("Expires")); 285 http_date_time_append(vb, expires); 286 } 287 288 return HANDLER_GO_ON; 289 } 290 291 REQUEST_FUNC(mod_expire_handler) { 292 plugin_data *p = p_d; 293 buffer *vb; 294 const data_string *ds; 295 296 /* Add caching headers only to http_status 200 OK or 206 Partial Content */ 297 if (r->http_status != 200 && r->http_status != 206) return HANDLER_GO_ON; 298 /* Add caching headers only to GET or HEAD requests */ 299 if (!http_method_get_or_head(r->http_method)) return HANDLER_GO_ON; 300 /* Add caching headers only if not already present */ 301 vb = http_header_response_get(r, HTTP_HEADER_CACHE_CONTROL, CONST_STR_LEN("Cache-Control")); 302 if (NULL != vb) return HANDLER_GO_ON; 303 304 mod_expire_patch_config(r, p); 305 306 /* check expire.url */ 307 ds = p->conf.expire_url 308 ? (const data_string *)array_match_key_prefix(p->conf.expire_url, &r->uri.path) 309 : NULL; 310 /* check expire.mimetypes (if no match with expire.url) */ 311 if (NULL == ds) { 312 if (NULL == p->conf.expire_mimetypes) return HANDLER_GO_ON; 313 vb = http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type")); 314 if (NULL != vb) 315 ds = (const data_string *) 316 array_match_key_prefix(p->conf.expire_mimetypes, vb); 317 if (NULL == ds) { 318 ds = (const data_string *) 319 array_get_element_klen(p->conf.expire_mimetypes, 320 CONST_STR_LEN("")); 321 if (NULL == ds) return HANDLER_GO_ON; 322 } 323 } 324 325 return mod_expire_set_header(r, p->toffsets + ds->value.used); 326 } 327 328 329 int mod_expire_plugin_init(plugin *p); 330 int mod_expire_plugin_init(plugin *p) { 331 p->version = LIGHTTPD_VERSION_ID; 332 p->name = "expire"; 333 334 p->init = mod_expire_init; 335 p->cleanup = mod_expire_free; 336 p->set_defaults= mod_expire_set_defaults; 337 p->handle_response_start = mod_expire_handler; 338 339 return 0; 340 } 341