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/*
* mod_expire - add "Expires" and "Cache-Control" headers to response
*
* Todo:
* none
*
* Author:
* Copyright (c) 2009 Thomas Porzelt
* License:
* MIT, see COPYING file in the lighttpd 2 tree
*/
#include <lighttpd/base.h>
LI_API gboolean mod_expire_init(liModules *mods, liModule *mod);
LI_API gboolean mod_expire_free(liModules *mods, liModule *mod);
struct expire_rule {
enum {
EXPIRE_ACCESS,
EXPIRE_MODIFICATION
} base;
guint num;
};
typedef struct expire_rule expire_rule;
static liHandlerResult expire(liVRequest *vr, gpointer param, gpointer *context) {
struct tm tm;
time_t expire_date;
guint len;
gint max_age;
GString *date_str = vr->wrk->tmp_str;
expire_rule *rule = param;
guint num = rule->num;
time_t now = (time_t)li_cur_ts(vr->wrk);
UNUSED(context);
if (rule->base == EXPIRE_ACCESS) {
expire_date = now + num;
max_age = num;
} else {
/* modification */
struct stat st;
gint err;
if (!vr->physical.path->len)
return LI_HANDLER_GO_ON;
switch (li_stat_cache_get(vr, vr->physical.path, &st, &err, NULL)) {
case LI_HANDLER_GO_ON: break;
case LI_HANDLER_WAIT_FOR_EVENT: return LI_HANDLER_WAIT_FOR_EVENT;
default: return LI_HANDLER_GO_ON;
}
expire_date = st.st_mtime + num;
if (expire_date < now)
expire_date = now;
max_age = expire_date - now;
}
/* format date */
g_string_set_size(date_str, 255);
if (!gmtime_r(&expire_date, &tm)) {
VR_ERROR(vr, "gmtime_r(%"G_GUINT64_FORMAT") failed: %s", (guint64)expire_date, g_strerror(errno));
return LI_HANDLER_GO_ON;
}
len = strftime(date_str->str, date_str->allocated_len, "%a, %d %b %Y %H:%M:%S GMT", &tm);
if (len == 0)
return LI_HANDLER_GO_ON;
g_string_set_size(date_str, len);
/* finally set the headers */
li_http_header_overwrite(vr->response.headers, CONST_STR_LEN("Expires"), GSTR_LEN(date_str));
g_string_truncate(date_str, 0);
g_string_append_len(date_str, CONST_STR_LEN("max-age="));
li_string_append_int(date_str, max_age);
li_http_header_append(vr->response.headers, CONST_STR_LEN("Cache-Control"), GSTR_LEN(date_str));
return LI_HANDLER_GO_ON;
}
static void expire_free(liServer *srv, gpointer param) {
UNUSED(srv);
g_slice_free(expire_rule, param);
}
static liAction* expire_create(liServer *srv, liWorker *wrk, liPlugin* p, liValue *val, gpointer userdata) {
expire_rule *rule;
gchar *str;
UNUSED(wrk); UNUSED(p); UNUSED(userdata);
val = li_value_get_single_argument(val);
if (LI_VALUE_STRING != li_value_type(val)) {
ERROR(srv, "%s", "expire expects a string as parameter");
return NULL;
}
rule = g_slice_new(expire_rule);
str = val->data.string->str;
/* check if we have "access", "now" or "modification as <base> */
if (g_str_has_prefix(str, "access ")) {
rule->base = EXPIRE_ACCESS;
str += sizeof("access ") - 1;
} else if (g_str_has_prefix(str, "now ")) {
rule->base = EXPIRE_ACCESS;
str += sizeof("now ") - 1;
} else if (g_str_has_prefix(str, "modification ")) {
rule->base = EXPIRE_MODIFICATION;
str += sizeof("modification ") - 1;
} else {
g_slice_free(expire_rule, rule);
ERROR(srv, "expire: error parsing rule \"%s\"", val->data.string->str);
return NULL;
}
/* skip the optional "plus", it does nothing */
if (g_str_has_prefix(str, "plus "))
str += sizeof("plus ") - 1;
rule->num = 0;
/* parse (<num> <type>)+ */
while (*str) {
guint num;
/* parse <num> */
num = 0;
for (; *str; str++) {
if (*str < '0' || *str > '9')
break;
num *= 10;
num += (*str) - '0';
}
if (!num) {
g_slice_free(expire_rule, rule);
ERROR(srv, "expire: error parsing rule \"%s\", <num> must be a positive integer", val->data.string->str);
return NULL;
}
/* parse <type> */
if (g_str_has_prefix(str, " second")) {
num *= 1;
str += sizeof(" second") - 1;
} else if (g_str_has_prefix(str, " minute")) {
num *= 60;
str += sizeof(" minute") - 1;
} else if (g_str_has_prefix(str, " hour")) {
num *= 3600;
str += sizeof(" hour") - 1;
} else if (g_str_has_prefix(str, " day")) {
num *= 3600*24;
str += sizeof(" day") - 1;
} else if (g_str_has_prefix(str, " week")) {
num *= 3600*24*7;
str += sizeof(" week") - 1;
} else if (g_str_has_prefix(str, " month")) {
num *= 3600*24*30;
str += sizeof(" month") - 1;
} else if (g_str_has_prefix(str, " year")) {
num *= 3600*24*365;
str += sizeof(" year") - 1;
} else {
g_slice_free(expire_rule, rule);
ERROR(srv, "expire: error parsing rule \"%s\", <type> must be one of 'seconds', 'minutes', 'hours', 'days', 'weeks', 'months' or 'years'", val->data.string->str);
return NULL;
}
rule->num += num;
if (*str == 's')
str++;
if (*str == ' ')
str++;
else if (*str) {
g_slice_free(expire_rule, rule);
ERROR(srv, "expire: error parsing rule \"%s\", <type> must be one of 'seconds', 'minutes', 'hours', 'days', 'weeks', 'months' or 'years'", val->data.string->str);
return NULL;
}
}
return li_action_new_function(expire, NULL, expire_free, rule);
}
static const liPluginOption options[] = {
{ NULL, 0, 0, NULL }
};
static const liPluginAction actions[] = {
{ "expire", expire_create, NULL },
{ NULL, NULL, NULL }
};
static const liPluginSetup setups[] = {
{ NULL, NULL, NULL }
};
static void plugin_expire_init(liServer *srv, liPlugin *p, gpointer userdata) {
UNUSED(srv); UNUSED(userdata);
p->options = options;
p->actions = actions;
p->setups = setups;
}
gboolean mod_expire_init(liModules *mods, liModule *mod) {
UNUSED(mod);
MODULE_VERSION_CHECK(mods);
mod->config = li_plugin_register(mods->main, "mod_expire", plugin_expire_init, NULL);
return mod->config != NULL;
}
gboolean mod_expire_free(liModules *mods, liModule *mod) {
if (mod->config)
li_plugin_free(mods->main, mod->config);
return TRUE;
}