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