250 lines
6.7 KiB
C
250 lines
6.7 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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typedef struct {
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ngx_str_t before_body;
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ngx_str_t after_body;
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ngx_hash_t types;
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ngx_array_t *types_keys;
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} ngx_http_addition_conf_t;
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typedef struct {
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ngx_uint_t before_body_sent;
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} ngx_http_addition_ctx_t;
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static void *ngx_http_addition_create_conf(ngx_conf_t *cf);
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static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf);
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static ngx_command_t ngx_http_addition_commands[] = {
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{ ngx_string("add_before_body"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_str_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_addition_conf_t, before_body),
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NULL },
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{ ngx_string("add_after_body"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_str_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_addition_conf_t, after_body),
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NULL },
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{ ngx_string("addition_types"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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ngx_http_types_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_addition_conf_t, types_keys),
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&ngx_http_html_default_types[0] },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_addition_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_addition_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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ngx_http_addition_create_conf, /* create location configuration */
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ngx_http_addition_merge_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_addition_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_addition_filter_module_ctx, /* module context */
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ngx_http_addition_commands, /* 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 ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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static ngx_int_t
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ngx_http_addition_header_filter(ngx_http_request_t *r)
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{
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ngx_http_addition_ctx_t *ctx;
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ngx_http_addition_conf_t *conf;
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if (r->headers_out.status != NGX_HTTP_OK || r != r->main) {
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return ngx_http_next_header_filter(r);
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}
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conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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if (conf->before_body.len == 0 && conf->after_body.len == 0) {
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return ngx_http_next_header_filter(r);
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}
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if (ngx_http_test_content_type(r, &conf->types) == NULL) {
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return ngx_http_next_header_filter(r);
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}
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ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t));
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if (ctx == NULL) {
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return NGX_ERROR;
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}
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ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module);
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ngx_http_clear_content_length(r);
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ngx_http_clear_accept_ranges(r);
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return ngx_http_next_header_filter(r);
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}
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static ngx_int_t
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ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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{
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ngx_int_t rc;
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ngx_uint_t last;
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ngx_chain_t *cl;
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ngx_http_request_t *sr;
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ngx_http_addition_ctx_t *ctx;
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ngx_http_addition_conf_t *conf;
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if (in == NULL || r->header_only) {
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return ngx_http_next_body_filter(r, in);
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}
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ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module);
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if (ctx == NULL) {
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return ngx_http_next_body_filter(r, in);
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}
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conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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if (!ctx->before_body_sent) {
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ctx->before_body_sent = 1;
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if (conf->before_body.len) {
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if (ngx_http_subrequest(r, &conf->before_body, NULL, &sr, NULL, 0)
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!= NGX_OK)
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{
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return NGX_ERROR;
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}
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}
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}
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if (conf->after_body.len == 0) {
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ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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return ngx_http_next_body_filter(r, in);
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}
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last = 0;
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for (cl = in; cl; cl = cl->next) {
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if (cl->buf->last_buf) {
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cl->buf->last_buf = 0;
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cl->buf->sync = 1;
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last = 1;
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}
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}
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rc = ngx_http_next_body_filter(r, in);
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if (rc == NGX_ERROR || !last || conf->after_body.len == 0) {
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return rc;
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}
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if (ngx_http_subrequest(r, &conf->after_body, NULL, &sr, NULL, 0)
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!= NGX_OK)
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{
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return NGX_ERROR;
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}
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ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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return ngx_http_send_special(r, NGX_HTTP_LAST);
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}
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static ngx_int_t
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ngx_http_addition_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_addition_header_filter;
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ngx_http_next_body_filter = ngx_http_top_body_filter;
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ngx_http_top_body_filter = ngx_http_addition_body_filter;
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return NGX_OK;
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}
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static void *
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ngx_http_addition_create_conf(ngx_conf_t *cf)
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{
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ngx_http_addition_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->before_body = { 0, NULL };
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* conf->after_body = { 0, NULL };
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* conf->types = { NULL };
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* conf->types_keys = NULL;
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*/
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return conf;
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}
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static char *
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ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_http_addition_conf_t *prev = parent;
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ngx_http_addition_conf_t *conf = child;
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ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
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ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
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if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
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prev->types_keys, &prev->types,
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ngx_http_html_default_types)
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!= NGX_OK)
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{
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return NGX_CONF_ERROR;
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}
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return NGX_CONF_OK;
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}
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