Mercurial > hg > nginx-vendor-0-7
view src/http/modules/ngx_http_headers_filter_module.c @ 71:66f1f40f29d6
Added tag NGINX_0_1_35 for changeset 8ad297c88dcb
author | Igor Sysoev <http://sysoev.ru> |
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date | Tue, 07 Jun 2005 00:00:00 +0400 |
parents | b55cbf18157e |
children | 962c43960644 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { time_t expires; } ngx_http_headers_conf_t; #define NGX_HTTP_EXPIRES_UNSET -2147483647 #define NGX_HTTP_EXPIRES_OFF -2147483646 #define NGX_HTTP_EXPIRES_EPOCH -2147483645 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle); static void *ngx_http_headers_create_conf(ngx_conf_t *cf); static char *ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_command_t ngx_http_headers_filter_commands[] = { { ngx_string("expires"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_headers_expires, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL}, ngx_null_command }; static ngx_http_module_t ngx_http_headers_filter_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_headers_create_conf, /* create location configuration */ ngx_http_headers_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_headers_filter_module = { NGX_MODULE_V1, &ngx_http_headers_filter_module_ctx, /* module context */ ngx_http_headers_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ ngx_http_headers_filter_init, /* init module */ NULL /* init process */ }; static ngx_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_int_t ngx_http_headers_filter(ngx_http_request_t *r) { size_t len; ngx_uint_t i; ngx_table_elt_t *expires, *cc; ngx_http_headers_conf_t *conf; if (r->headers_out.status != NGX_HTTP_OK || r->main) { return ngx_http_next_header_filter(r); } conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module); if (conf->expires != NGX_HTTP_EXPIRES_OFF) { expires = r->headers_out.expires; if (expires == NULL) { expires = ngx_list_push(&r->headers_out.headers); if (expires == NULL) { return NGX_ERROR; } r->headers_out.expires = expires; expires->hash = 1; expires->key.len = sizeof("Expires") - 1; expires->key.data = (u_char *) "Expires"; } len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); expires->value.len = len - 1; cc = r->headers_out.cache_control.elts; if (cc == NULL) { cc = ngx_list_push(&r->headers_out.headers); if (cc == NULL) { return NGX_ERROR; } cc->hash = 1; cc->key.len = sizeof("Cache-Control") - 1; cc->key.data = (u_char *) "Cache-Control"; } else { for (i = 1; i < r->headers_out.cache_control.nelts; i++) { cc[i].hash = 0; } } if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) { expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT"; cc->value.len = sizeof("no-cache") - 1; cc->value.data = (u_char *) "no-cache"; } else { expires->value.data = ngx_palloc(r->pool, len); if (expires->value.data == NULL) { return NGX_ERROR; } if (conf->expires == 0) { ngx_memcpy(expires->value.data, ngx_cached_http_time.data, ngx_cached_http_time.len + 1); cc->value.len = sizeof("max-age=0") - 1; cc->value.data = (u_char *) "max-age=0"; } else { ngx_http_time(expires->value.data, ngx_time() + conf->expires); if (conf->expires < 0) { cc->value.len = sizeof("no-cache") - 1; cc->value.data = (u_char *) "no-cache"; } else { cc->value.data = ngx_palloc(r->pool, sizeof("max-age=") + NGX_TIME_T_LEN + 1); if (cc->value.data == NULL) { return NGX_ERROR; } cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", conf->expires) - cc->value.data; } } } } return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_headers_filter; return NGX_OK; } static void * ngx_http_headers_create_conf(ngx_conf_t *cf) { ngx_http_headers_conf_t *conf; conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t)); if (conf == NULL) { return NGX_CONF_ERROR; } conf->expires = NGX_HTTP_EXPIRES_UNSET; return conf; } static char * ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_headers_conf_t *prev = parent; ngx_http_headers_conf_t *conf = child; if (conf->expires == NGX_HTTP_EXPIRES_UNSET) { conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ? NGX_HTTP_EXPIRES_OFF : prev->expires; } return NGX_CONF_OK; } static char * ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_headers_conf_t *hcf = conf; ngx_uint_t minus; ngx_str_t *value; if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) { return "is duplicate"; } value = cf->args->elts; if (ngx_strcmp(value[1].data, "epoch") == 0) { hcf->expires = NGX_HTTP_EXPIRES_EPOCH; return NGX_CONF_OK; } if (ngx_strcmp(value[1].data, "off") == 0) { hcf->expires = NGX_HTTP_EXPIRES_OFF; return NGX_CONF_OK; } if (value[1].data[0] == '+') { value[1].data++; value[1].len--; minus = 0; } else if (value[1].data[0] == '-') { value[1].data++; value[1].len--; minus = 1; } else { minus = 0; } hcf->expires = ngx_parse_time(&value[1], 1); if (hcf->expires == NGX_ERROR) { return "invalid value"; } if (hcf->expires == NGX_PARSE_LARGE_TIME) { return "value must be less than 68 years"; } if (minus) { hcf->expires = - hcf->expires; } return NGX_CONF_OK; }