92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf);
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static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_not_modified_filter_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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NULL, /* create location configuration */
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NULL /* merge location configuration */
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};
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ngx_module_t ngx_http_not_modified_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_not_modified_filter_module_ctx, /* module context */
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NULL, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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static
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ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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{
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time_t ims;
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if (r->headers_out.status != NGX_HTTP_OK
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|| r != r->main
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|| r->headers_in.if_modified_since == NULL
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|| r->headers_out.last_modified_time == -1)
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{
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return ngx_http_next_header_filter(r);
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}
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ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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r->headers_in.if_modified_since->value.len);
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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/*
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* I think that the equality of the dates is correcter
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*/
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if (ims == r->headers_out.last_modified_time) {
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r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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r->headers_out.content_type.len = 0;
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ngx_http_clear_content_length(r);
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ngx_http_clear_accept_ranges(r);
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}
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return ngx_http_next_header_filter(r);
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}
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static
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ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf)
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{
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ngx_http_next_header_filter = ngx_http_top_header_filter;
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ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
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return NGX_OK;
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}
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