642 lines
16 KiB
C
642 lines
16 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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typedef struct ngx_http_header_val_s ngx_http_header_val_t;
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typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r,
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ngx_http_header_val_t *hv, ngx_str_t *value);
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typedef struct {
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ngx_str_t name;
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ngx_uint_t offset;
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ngx_http_set_header_pt handler;
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} ngx_http_set_header_t;
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struct ngx_http_header_val_s {
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ngx_table_elt_t value;
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ngx_uint_t offset;
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ngx_http_set_header_pt handler;
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ngx_array_t *lengths;
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ngx_array_t *values;
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};
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#define NGX_HTTP_EXPIRES_OFF 0
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#define NGX_HTTP_EXPIRES_EPOCH 1
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#define NGX_HTTP_EXPIRES_MAX 2
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#define NGX_HTTP_EXPIRES_ACCESS 3
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#define NGX_HTTP_EXPIRES_MODIFIED 4
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#define NGX_HTTP_EXPIRES_DAILY 5
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typedef struct {
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ngx_uint_t expires;
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time_t expires_time;
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ngx_array_t *headers;
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} ngx_http_headers_conf_t;
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static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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ngx_http_headers_conf_t *conf);
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static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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ngx_http_header_val_t *hv, ngx_str_t *value);
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static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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ngx_http_header_val_t *hv, ngx_str_t *value);
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static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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void *parent, void *child);
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static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static ngx_http_set_header_t ngx_http_set_headers[] = {
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{ ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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{ ngx_string("Last-Modified"),
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offsetof(ngx_http_headers_out_t, last_modified),
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ngx_http_set_last_modified },
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{ ngx_null_string, 0, NULL }
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};
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static ngx_command_t ngx_http_headers_filter_commands[] = {
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{ ngx_string("expires"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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|NGX_CONF_TAKE12,
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ngx_http_headers_expires,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL},
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{ ngx_string("add_header"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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|NGX_CONF_TAKE2,
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ngx_http_headers_add,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL},
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_headers_filter_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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ngx_http_headers_create_conf, /* create location configuration */
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ngx_http_headers_merge_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_headers_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_headers_filter_module_ctx, /* module context */
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ngx_http_headers_filter_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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static ngx_int_t
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ngx_http_headers_filter(ngx_http_request_t *r)
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{
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ngx_str_t value;
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ngx_uint_t i;
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ngx_http_header_val_t *h;
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ngx_http_headers_conf_t *conf;
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conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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|| r != r->main
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|| (r->headers_out.status != NGX_HTTP_OK
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&& r->headers_out.status != NGX_HTTP_NO_CONTENT
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&& r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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&& r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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{
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return ngx_http_next_header_filter(r);
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}
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if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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if (ngx_http_set_expires(r, conf) != NGX_OK) {
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return NGX_ERROR;
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}
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}
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if (conf->headers) {
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h = conf->headers->elts;
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for (i = 0; i < conf->headers->nelts; i++) {
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if (h[i].lengths == NULL) {
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value = h[i].value.value;
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} else {
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if (ngx_http_script_run(r, &value, h[i].lengths->elts, 0,
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h[i].values->elts)
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== NULL)
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{
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return NGX_ERROR;
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}
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}
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if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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return NGX_ERROR;
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}
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}
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}
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return ngx_http_next_header_filter(r);
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}
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static ngx_int_t
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ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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{
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size_t len;
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time_t now, expires_time, max_age;
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ngx_uint_t i;
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ngx_table_elt_t *expires, *cc, **ccp;
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expires = r->headers_out.expires;
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if (expires == NULL) {
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expires = ngx_list_push(&r->headers_out.headers);
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if (expires == NULL) {
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return NGX_ERROR;
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}
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r->headers_out.expires = expires;
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expires->hash = 1;
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expires->key.len = sizeof("Expires") - 1;
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expires->key.data = (u_char *) "Expires";
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}
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len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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expires->value.len = len - 1;
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ccp = r->headers_out.cache_control.elts;
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if (ccp == NULL) {
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if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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1, sizeof(ngx_table_elt_t *))
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!= NGX_OK)
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{
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return NGX_ERROR;
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}
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ccp = ngx_array_push(&r->headers_out.cache_control);
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if (ccp == NULL) {
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return NGX_ERROR;
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}
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cc = ngx_list_push(&r->headers_out.headers);
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if (cc == NULL) {
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return NGX_ERROR;
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}
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cc->hash = 1;
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cc->key.len = sizeof("Cache-Control") - 1;
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cc->key.data = (u_char *) "Cache-Control";
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*ccp = cc;
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} else {
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for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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ccp[i]->hash = 0;
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}
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cc = ccp[0];
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}
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if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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cc->value.len = sizeof("no-cache") - 1;
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cc->value.data = (u_char *) "no-cache";
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return NGX_OK;
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}
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if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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/* 10 years */
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cc->value.len = sizeof("max-age=315360000") - 1;
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cc->value.data = (u_char *) "max-age=315360000";
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return NGX_OK;
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}
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expires->value.data = ngx_palloc(r->pool, len);
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if (expires->value.data == NULL) {
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return NGX_ERROR;
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}
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if (conf->expires_time == 0) {
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ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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ngx_cached_http_time.len + 1);
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cc->value.len = sizeof("max-age=0") - 1;
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cc->value.data = (u_char *) "max-age=0";
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return NGX_OK;
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}
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now = ngx_time();
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if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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|| r->headers_out.last_modified_time == -1)
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{
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expires_time = now + conf->expires_time;
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max_age = conf->expires_time;
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} else if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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expires_time = ngx_next_time(conf->expires_time);
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max_age = expires_time - now;
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} else {
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expires_time = r->headers_out.last_modified_time + conf->expires_time;
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max_age = expires_time - now;
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}
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ngx_http_time(expires->value.data, expires_time);
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if (conf->expires_time < 0) {
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cc->value.len = sizeof("no-cache") - 1;
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cc->value.data = (u_char *) "no-cache";
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return NGX_OK;
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}
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cc->value.data = ngx_palloc(r->pool,
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sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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if (cc->value.data == NULL) {
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return NGX_ERROR;
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}
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cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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- cc->value.data;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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ngx_str_t *value)
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{
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ngx_table_elt_t *h;
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h = ngx_list_push(&r->headers_out.headers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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h->hash = hv->value.hash;
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h->key = hv->value.key;
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h->value = *value;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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ngx_str_t *value)
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{
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ngx_table_elt_t *cc, **ccp;
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ccp = r->headers_out.cache_control.elts;
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if (ccp == NULL) {
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if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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1, sizeof(ngx_table_elt_t *))
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!= NGX_OK)
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{
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return NGX_ERROR;
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}
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}
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ccp = ngx_array_push(&r->headers_out.cache_control);
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if (ccp == NULL) {
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return NGX_ERROR;
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}
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cc = ngx_list_push(&r->headers_out.headers);
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if (cc == NULL) {
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return NGX_ERROR;
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}
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cc->hash = 1;
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cc->key.len = sizeof("Cache-Control") - 1;
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cc->key.data = (u_char *) "Cache-Control";
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cc->value = *value;
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*ccp = cc;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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ngx_str_t *value)
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{
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ngx_table_elt_t *h, **old;
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if (hv->offset) {
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old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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} else {
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old = NULL;
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}
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r->headers_out.last_modified_time = -1;
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if (old == NULL || *old == NULL) {
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if (value->len == 0) {
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return NGX_OK;
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}
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h = ngx_list_push(&r->headers_out.headers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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} else {
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h = *old;
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if (value->len == 0) {
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h->hash = 0;
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return NGX_OK;
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}
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}
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h->hash = hv->value.hash;
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h->key = hv->value.key;
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h->value = *value;
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return NGX_OK;
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}
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static void *
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ngx_http_headers_create_conf(ngx_conf_t *cf)
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{
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ngx_http_headers_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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if (conf == NULL) {
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return NGX_CONF_ERROR;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->headers = NULL;
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* conf->expires_time = 0;
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*/
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conf->expires = NGX_CONF_UNSET_UINT;
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return conf;
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}
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static char *
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ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_http_headers_conf_t *prev = parent;
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ngx_http_headers_conf_t *conf = child;
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if (conf->expires == NGX_CONF_UNSET_UINT) {
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conf->expires = prev->expires;
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conf->expires_time = prev->expires_time;
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if (conf->expires == NGX_CONF_UNSET_UINT) {
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conf->expires = NGX_HTTP_EXPIRES_OFF;
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}
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}
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if (conf->headers == NULL) {
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conf->headers = prev->headers;
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}
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return NGX_CONF_OK;
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}
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static ngx_int_t
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ngx_http_headers_filter_init(ngx_conf_t *cf)
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{
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ngx_http_next_header_filter = ngx_http_top_header_filter;
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ngx_http_top_header_filter = ngx_http_headers_filter;
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return NGX_OK;
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}
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static char *
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ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_http_headers_conf_t *hcf = conf;
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ngx_uint_t minus, n;
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ngx_str_t *value;
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if (hcf->expires != NGX_CONF_UNSET_UINT) {
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return "is duplicate";
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}
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value = cf->args->elts;
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if (cf->args->nelts == 2) {
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if (ngx_strcmp(value[1].data, "epoch") == 0) {
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hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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return NGX_CONF_OK;
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}
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if (ngx_strcmp(value[1].data, "max") == 0) {
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hcf->expires = NGX_HTTP_EXPIRES_MAX;
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return NGX_CONF_OK;
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}
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if (ngx_strcmp(value[1].data, "off") == 0) {
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hcf->expires = NGX_HTTP_EXPIRES_OFF;
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return NGX_CONF_OK;
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}
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hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
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n = 1;
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} else { /* cf->args->nelts == 3 */
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if (ngx_strcmp(value[1].data, "modified") != 0) {
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return "invalid value";
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}
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hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
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n = 2;
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}
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if (value[n].data[0] == '@') {
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value[n].data++;
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value[n].len--;
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minus = 0;
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if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
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return "daily time can not be used with \"modified\" parameter";
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}
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hcf->expires = NGX_HTTP_EXPIRES_DAILY;
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} else if (value[n].data[0] == '+') {
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value[n].data++;
|
|
value[n].len--;
|
|
minus = 0;
|
|
|
|
} else if (value[n].data[0] == '-') {
|
|
value[n].data++;
|
|
value[n].len--;
|
|
minus = 1;
|
|
|
|
} else {
|
|
minus = 0;
|
|
}
|
|
|
|
hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
|
|
if (hcf->expires_time == NGX_ERROR) {
|
|
return "invalid value";
|
|
}
|
|
|
|
if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
&& hcf->expires_time > 24 * 60 * 60)
|
|
{
|
|
return "daily time value must be less than 24 hours";
|
|
}
|
|
|
|
if (hcf->expires_time == NGX_PARSE_LARGE_TIME) {
|
|
return "value must be less than 68 years";
|
|
}
|
|
|
|
if (minus) {
|
|
hcf->expires_time = - hcf->expires_time;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
{
|
|
ngx_http_headers_conf_t *hcf = conf;
|
|
|
|
ngx_int_t n;
|
|
ngx_str_t *value;
|
|
ngx_uint_t i;
|
|
ngx_http_header_val_t *h;
|
|
ngx_http_set_header_t *sh;
|
|
ngx_http_script_compile_t sc;
|
|
|
|
value = cf->args->elts;
|
|
|
|
if (hcf->headers == NULL) {
|
|
hcf->headers = ngx_array_create(cf->pool, 1,
|
|
sizeof(ngx_http_header_val_t));
|
|
if (hcf->headers == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
}
|
|
|
|
h = ngx_array_push(hcf->headers);
|
|
if (h == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
h->value.hash = 1;
|
|
h->value.key = value[1];
|
|
h->value.value = value[2];
|
|
h->offset = 0;
|
|
h->handler = ngx_http_add_header;
|
|
h->lengths = NULL;
|
|
h->values = NULL;
|
|
|
|
sh = ngx_http_set_headers;
|
|
for (i = 0; sh[i].name.len; i++) {
|
|
if (ngx_strcasecmp(value[1].data, sh[i].name.data) != 0) {
|
|
continue;
|
|
}
|
|
|
|
h->offset = sh[i].offset;
|
|
h->handler = sh[i].handler;
|
|
break;
|
|
}
|
|
|
|
n = ngx_http_script_variables_count(&value[2]);
|
|
|
|
if (n == 0) {
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
|
sc.cf = cf;
|
|
sc.source = &value[2];
|
|
sc.lengths = &h->lengths;
|
|
sc.values = &h->values;
|
|
sc.variables = n;
|
|
sc.complete_lengths = 1;
|
|
sc.complete_values = 1;
|
|
|
|
if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|