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view src/http/modules/ngx_http_not_modified_filter_module.c @ 120:e85dca77c46a NGINX_0_3_7

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nginx 0.3.7 *) Feature: the "access_log" supports the "buffer=" parameter. *) Bugfix: nginx could not be built on platforms different from i386, amd64, sparc É ppc; bug appeared in 0.3.2.
author Igor Sysoev <http://sysoev.ru>
date Thu, 27 Oct 2005 00:00:00 +0400
parents f63280c59dd5
children df17fbafec8f
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>



static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle);


static ngx_http_module_t  ngx_http_not_modified_filter_module_ctx = {
    NULL,                                  /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    NULL,                                  /* create location configuration */
    NULL                                   /* merge location configuration */
};


ngx_module_t  ngx_http_not_modified_filter_module = {
    NGX_MODULE_V1,
    &ngx_http_not_modified_filter_module_ctx, /* module context */
    NULL,                                  /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    ngx_http_not_modified_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_not_modified_header_filter(ngx_http_request_t *r)
{
    time_t  ims;

    if (r->headers_out.status != NGX_HTTP_OK
        || r->main != r
        || r->headers_in.if_modified_since == NULL
        || r->headers_out.last_modified_time == -1)
    {
        return ngx_http_next_header_filter(r);
    }

    ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
                              r->headers_in.if_modified_since->value.len);
    
    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);

    /*
     * I think that the equality of the dates is correcter
     */

    if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) {
        r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
        r->headers_out.content_type.len = 0;
        r->headers_out.content_length_n = -1;
        r->headers_out.content_length = NULL;
#if 0
        r->headers_out.accept_ranges->hash = 0;
#endif
    }

    return ngx_http_next_header_filter(r);
}


static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle)
{
    ngx_http_next_header_filter = ngx_http_top_header_filter;
    ngx_http_top_header_filter = ngx_http_not_modified_header_filter;

    return NGX_OK;
}