Mercurial > hg > nginx-vendor-0-8
diff src/http/modules/ngx_http_headers_filter.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 4b2dafa26fe2 |
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new file mode 100644 --- /dev/null +++ b/src/http/modules/ngx_http_headers_filter.c @@ -0,0 +1,239 @@ + +/* + * 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); +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, /* pre conf */ + + 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, + &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 child */ +}; + + +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_table_elt_t *expires, *cc; + ngx_http_headers_conf_t *conf; + + if (r->headers_out.status != NGX_HTTP_OK) { + 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) { + + if (!(expires = ngx_list_push(&r->headers_out.headers))) { + return NGX_ERROR; + } + + r->headers_out.expires = expires; + + if (!(cc = ngx_list_push(&r->headers_out.headers))) { + return NGX_ERROR; + } + + r->headers_out.cache_control = cc; + + len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); + + expires->key.len = sizeof("Expires") - 1; + expires->key.data = (u_char *) "Expires"; + expires->value.len = len - 1; + + cc->key.len = sizeof("Cache-Control") - 1; + cc->key.data = (u_char *) "Cache-Control"; + + 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=") + TIME_T_LEN + 1); + if (cc->value.data == NULL) { + return NGX_ERROR; + } + + cc->value.len = ngx_snprintf((char *) cc->value.data, + sizeof("max-age=") + TIME_T_LEN, + "max-age=" TIME_T_FMT, + conf->expires); + } + } + } + } + + 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; + + if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t)))) { + 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; +} + + +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; +}