Mercurial > hg > nginx-vendor-0-8
view src/http/modules/ngx_http_headers_filter_module.c @ 325:f395c7a4c8a8
Added tag NGINX_0_6_6 for changeset f7cd062ee035
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 30 Jul 2007 00:00:00 +0400 |
parents | 5bef04fc3fd5 |
children | 9fc4ab6673f9 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_table_elt_t value; ngx_array_t *lengths; ngx_array_t *values; } ngx_http_header_val_t; typedef struct { time_t expires; ngx_str_t cache_control; ngx_array_t *headers; } ngx_http_headers_conf_t; #define NGX_HTTP_EXPIRES_UNSET -2147483647 #define NGX_HTTP_EXPIRES_OFF -2147483646 #define NGX_HTTP_EXPIRES_EPOCH -2147483645 #define NGX_HTTP_EXPIRES_MAX -2147483644 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 ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf); static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_headers_add(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_HTTP_LIF_CONF |NGX_CONF_TAKE1, ngx_http_headers_expires, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL}, { ngx_string("add_header"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |NGX_CONF_TAKE2, ngx_http_headers_add, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL}, ngx_null_command }; static ngx_http_module_t ngx_http_headers_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_headers_filter_init, /* 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 */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; 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, **ccp, *out; ngx_http_header_val_t *h; ngx_http_headers_conf_t *conf; if (r != r->main || (r->headers_out.status != NGX_HTTP_OK && r->headers_out.status != NGX_HTTP_NO_CONTENT && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)) { 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; ccp = r->headers_out.cache_control.elts; if (ccp == NULL) { if (ngx_array_init(&r->headers_out.cache_control, r->pool, 1, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } ccp = ngx_array_push(&r->headers_out.cache_control); if (ccp == NULL) { return NGX_ERROR; } 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"; *ccp = cc; } else { for (i = 1; i < r->headers_out.cache_control.nelts; i++) { ccp[i]->hash = 0; } cc = ccp[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 if (conf->expires == NGX_HTTP_EXPIRES_MAX) { expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT"; /* 10 years */ cc->value.len = sizeof("max-age=315360000") - 1; cc->value.data = (u_char *) "max-age=315360000"; } 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; } } } } if (conf->cache_control.len) { ccp = r->headers_out.cache_control.elts; if (ccp == NULL) { if (ngx_array_init(&r->headers_out.cache_control, r->pool, 1, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } } ccp = ngx_array_push(&r->headers_out.cache_control); if (ccp == NULL) { return NGX_ERROR; } 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"; cc->value = conf->cache_control; *ccp = cc; } if (conf->headers) { h = conf->headers->elts; for (i = 0; i < conf->headers->nelts; i++) { out = ngx_list_push(&r->headers_out.headers); if (out == NULL) { return NGX_ERROR; } out->hash = h[i].value.hash; out->key = h[i].value.key; if (h[i].lengths == NULL) { out->value = h[i].value.value; continue; } if (ngx_http_script_run(r, &out->value, h[i].lengths->elts, 0, h[i].values->elts) == NULL) { return NGX_ERROR; } } } return ngx_http_next_header_filter(r); } static void * ngx_http_headers_create_conf(ngx_conf_t *cf) { ngx_http_headers_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t)); if (conf == NULL) { return NGX_CONF_ERROR; } /* * set by ngx_pcalloc(): * * conf->cache_control.len = 0; * conf->cache_control.data = NULL; * conf->headers = NULL; */ 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; } if (conf->cache_control.data == NULL) { conf->cache_control = prev->cache_control; } if (conf->headers == NULL) { conf->headers = prev->headers; } return NGX_CONF_OK; } static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_headers_filter; return NGX_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, "max") == 0) { hcf->expires = NGX_HTTP_EXPIRES_MAX; 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; } 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_http_header_val_t *h; ngx_http_script_compile_t sc; value = cf->args->elts; if (ngx_strcasecmp(value[1].data, (u_char *) "cache-control") == 0) { hcf->cache_control = value[2]; return NGX_CONF_OK; } 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->lengths = NULL; h->values = NULL; 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; }