diff options
Diffstat (limited to 'app/nginx/src/http/modules/ngx_http_addition_filter_module.c')
| -rw-r--r-- | app/nginx/src/http/modules/ngx_http_addition_filter_module.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/app/nginx/src/http/modules/ngx_http_addition_filter_module.c b/app/nginx/src/http/modules/ngx_http_addition_filter_module.c new file mode 100644 index 0000000..2fad0e5 --- /dev/null +++ b/app/nginx/src/http/modules/ngx_http_addition_filter_module.c @@ -0,0 +1,252 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#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("addition_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); + ngx_http_weak_etag(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->last_in_chain = 1; + 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; +} |