lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "array.h"
#include "buffer.h"
#include "log.h"
#include "http_header.h"
#include "plugin.h"
#include "stat_cache.h"
#include <stdlib.h>
#include <string.h>
#include <time.h>
/**
* set HTTP headers Cache-Control and Expires
*/
typedef struct {
const array *expire_url;
const array *expire_mimetypes;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
time_t *toffsets;
uint32_t tused;
} plugin_data;
INIT_FUNC(mod_expire_init) {
return calloc(1, sizeof(plugin_data));
}
FREE_FUNC(mod_expire_free) {
plugin_data * const p = p_d;
free(p->toffsets);
}
static time_t mod_expire_get_offset(log_error_st *errh, const buffer *expire, time_t *offset) {
char *ts;
time_t type = -1;
time_t retts = 0;
/*
* parse
*
* '(access|now|modification) [plus] {<num> <type>}*'
*
* e.g. 'access 1 years'
*/
if (buffer_string_is_empty(expire)) {
log_error(errh, __FILE__, __LINE__, "mod_expire empty string");
return -1;
}
ts = expire->ptr;
if (0 == strncmp(ts, "access ", 7)) {
type = 0;
ts += 7;
} else if (0 == strncmp(ts, "now ", 4)) {
type = 0;
ts += 4;
} else if (0 == strncmp(ts, "modification ", 13)) {
type = 1;
ts += 13;
} else {
/* invalid type-prefix */
log_error(errh, __FILE__, __LINE__, "invalid <base>: %s", ts);
return -1;
}
if (0 == strncmp(ts, "plus ", 5)) {
/* skip the optional plus */
ts += 5;
}
/* the rest is just <number> (years|months|weeks|days|hours|minutes|seconds) */
while (1) {
char *space, *err;
int num;
if (NULL == (space = strchr(ts, ' '))) {
log_error(errh, __FILE__, __LINE__,
"missing space after <num>: %s", ts);
return -1;
}
num = strtol(ts, &err, 10);
if (*err != ' ') {
log_error(errh, __FILE__, __LINE__,
"missing <type> after <num>: %s", ts);
return -1;
}
ts = space + 1;
if (NULL != (space = strchr(ts, ' '))) {
int slen;
/* */
slen = space - ts;
if (slen == 5 &&
0 == strncmp(ts, "years", slen)) {
num *= 60 * 60 * 24 * 30 * 12;
} else if (slen == 6 &&
0 == strncmp(ts, "months", slen)) {
num *= 60 * 60 * 24 * 30;
} else if (slen == 5 &&
0 == strncmp(ts, "weeks", slen)) {
num *= 60 * 60 * 24 * 7;
} else if (slen == 4 &&
0 == strncmp(ts, "days", slen)) {
num *= 60 * 60 * 24;
} else if (slen == 5 &&
0 == strncmp(ts, "hours", slen)) {
num *= 60 * 60;
} else if (slen == 7 &&
0 == strncmp(ts, "minutes", slen)) {
num *= 60;
} else if (slen == 7 &&
0 == strncmp(ts, "seconds", slen)) {
num *= 1;
} else {
log_error(errh, __FILE__, __LINE__, "unknown type: %s", ts);
return -1;
}
retts += num;
ts = space + 1;
} else {
if (0 == strcmp(ts, "years")) {
num *= 60 * 60 * 24 * 30 * 12;
} else if (0 == strcmp(ts, "months")) {
num *= 60 * 60 * 24 * 30;
} else if (0 == strcmp(ts, "weeks")) {
num *= 60 * 60 * 24 * 7;
} else if (0 == strcmp(ts, "days")) {
num *= 60 * 60 * 24;
} else if (0 == strcmp(ts, "hours")) {
num *= 60 * 60;
} else if (0 == strcmp(ts, "minutes")) {
num *= 60;
} else if (0 == strcmp(ts, "seconds")) {
num *= 1;
} else {
log_error(errh, __FILE__, __LINE__, "unknown type: %s", ts);
return -1;
}
retts += num;
break;
}
}
*offset = retts;
return type;
}
static void mod_expire_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* expire.url */
pconf->expire_url = cpv->v.a;
break;
case 1: /* expire.mimetypes */
pconf->expire_mimetypes = cpv->v.a;
break;
default:/* should not happen */
return;
}
}
static void mod_expire_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_expire_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_expire_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_expire_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_expire_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("expire.url"),
T_CONFIG_ARRAY_KVSTRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("expire.mimetypes"),
T_CONFIG_ARRAY_KVSTRING,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_expire"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
const array *a = NULL;
switch (cpv->k_id) {
case 0: /* expire.url */
a = cpv->v.a;
break;
case 1: /* expire.mimetypes */
for (uint32_t k = 0; k < cpv->v.a->used; ++k) {
data_string *ds = (data_string *)cpv->v.a->data[k];
/*(omit trailing '*', if present, from prefix match)*/
/*(not usually a good idea to modify array keys
* since doing so might break array_get_element_klen()
* search; config should be consistent in using * or not)*/
size_t klen = buffer_string_length(&ds->key);
if (klen && ds->key.ptr[klen-1] == '*')
buffer_string_set_length(&ds->key, klen-1);
}
a = cpv->v.a;
break;
default:/* should not happen */
break;
}
/* parse array values into structured data */
if (NULL != a && a->used) {
p->toffsets =
realloc(p->toffsets, sizeof(time_t) * (p->tused + a->used*2));
time_t *toff = p->toffsets + p->tused;
for (uint32_t k = 0; k < a->used; ++k, toff+=2, p->tused+=2) {
buffer *v = &((data_string *)a->data[k])->value;
*toff = mod_expire_get_offset(srv->errh, v, toff+1);
if (-1 == *toff) {
log_error(srv->errh, __FILE__, __LINE__,
"parsing %s failed: %s", cpk[cpv->k_id].k, v->ptr);
return HANDLER_ERROR;
}
/* overwrite v->used with offset int p->toffsets
* as v->ptr is not used by this module after config */
v->used = (uint32_t)p->tused;
}
}
}
}
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_expire_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
REQUEST_FUNC(mod_expire_handler) {
plugin_data *p = p_d;
const buffer *vb;
const data_string *ds;
/* Add caching headers only to http_status 200 OK or 206 Partial Content */
if (r->http_status != 200 && r->http_status != 206) return HANDLER_GO_ON;
/* Add caching headers only to GET or HEAD requests */
if (!http_method_get_or_head(r->http_method)) return HANDLER_GO_ON;
/* Add caching headers only if not already present */
vb = http_header_response_get(r, HTTP_HEADER_CACHE_CONTROL, CONST_STR_LEN("Cache-Control"));
if (NULL != vb) return HANDLER_GO_ON;
mod_expire_patch_config(r, p);
/* check expire.url */
ds = p->conf.expire_url
? (const data_string *)array_match_key_prefix(p->conf.expire_url, &r->uri.path)
: NULL;
/* check expire.mimetypes (if no match with expire.url) */
if (NULL == ds) {
if (NULL == p->conf.expire_mimetypes) return HANDLER_GO_ON;
vb = http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"));
ds = (NULL != vb)
? (const data_string *)array_match_key_prefix(p->conf.expire_mimetypes, vb)
: (const data_string *)array_get_element_klen(p->conf.expire_mimetypes, CONST_STR_LEN(""));
if (NULL == ds) return HANDLER_GO_ON;
}
const time_t * const off = p->toffsets + ds->value.used;
const time_t cur_ts = log_epoch_secs;
time_t expires = off[1];
if (0 == off[0]) { /* access */
expires += cur_ts;
}
else { /* modification */
const stat_cache_st * const st = stat_cache_path_stat(&r->physical.path);
/* can't set modification-based expire if mtime is not available */
if (NULL == st) return HANDLER_GO_ON;
expires += st->st_mtime;
}
/* expires should be at least cur_ts */
if (expires < cur_ts) expires = cur_ts;
buffer * const tb = r->tmp_buf;
/* HTTP/1.0 */
buffer_clear(tb);
buffer_append_strftime(tb, "%a, %d %b %Y %H:%M:%S GMT", gmtime(&(expires)));
http_header_response_set(r, HTTP_HEADER_EXPIRES,
CONST_STR_LEN("Expires"),
CONST_BUF_LEN(tb));
/* HTTP/1.1 */
buffer_copy_string_len(tb, CONST_STR_LEN("max-age="));
buffer_append_int(tb, expires - cur_ts); /* as expires >= cur_ts the difference is >= 0 */
http_header_response_set(r, HTTP_HEADER_CACHE_CONTROL, CONST_STR_LEN("Cache-Control"), CONST_BUF_LEN(tb));
return HANDLER_GO_ON;
}
int mod_expire_plugin_init(plugin *p);
int mod_expire_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "expire";
p->init = mod_expire_init;
p->cleanup = mod_expire_free;
p->set_defaults= mod_expire_set_defaults;
p->handle_response_start = mod_expire_handler;
return 0;
}