Mercurial > hg > nginx-ranges
view src/http/modules/ngx_http_headers_filter_module.c @ 196:8759b346e431 NGINX_0_3_45
nginx 0.3.45
*) Feature: the "ssl_verify_client", "ssl_verify_depth", and
"ssl_client_certificate" directives.
*) Change: the $request_method variable now returns the main request
method.
*) Change: the ° symbol codes were changed in koi-win conversion
table.
*) Feature: the euro и N symbols were added to koi-win conversion table.
*) Bugfix: if nginx distributed the requests among several backends and
some backend failed, then requests intended for this backend was
directed to one live backend only instead of being distributed among
the rest.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Sat, 06 May 2006 00:00:00 +0400 |
parents | 3080c5392b89 |
children | 56688ed172c8 |
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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 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 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 */ 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 */ NULL, /* init master */ ngx_http_headers_filter_init, /* 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->headers_out.status != NGX_HTTP_OK && r->headers_out.status != NGX_HTTP_NOT_MODIFIED) || r != 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; 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 { 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 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_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 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; } 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, "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; }