805 lines
20 KiB
C
805 lines
20 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 match;
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ngx_str_t sub;
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ngx_array_t *types; /* array of ngx_str_t */
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ngx_array_t *sub_lengths;
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ngx_array_t *sub_values;
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ngx_flag_t once;
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} ngx_http_sub_loc_conf_t;
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typedef enum {
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sub_start_state = 0,
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sub_match_state,
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} ngx_http_sub_state_e;
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typedef struct {
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ngx_str_t match;
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ngx_uint_t once; /* unsigned once:1 */
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ngx_buf_t *buf;
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u_char *pos;
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u_char *copy_start;
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u_char *copy_end;
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ngx_chain_t *in;
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ngx_chain_t *out;
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ngx_chain_t **last_out;
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ngx_chain_t *busy;
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ngx_chain_t *free;
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ngx_str_t sub;
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ngx_uint_t state;
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size_t saved;
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size_t looked;
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} ngx_http_sub_ctx_t;
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static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r,
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ngx_http_sub_ctx_t *ctx);
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static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r,
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ngx_http_sub_ctx_t *ctx);
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static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static char *ngx_http_sub_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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static void *ngx_http_sub_create_conf(ngx_conf_t *cf);
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static char *ngx_http_sub_merge_conf(ngx_conf_t *cf,
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void *parent, void *child);
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static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf);
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static ngx_command_t ngx_http_sub_filter_commands[] = {
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{ ngx_string("sub_filter"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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ngx_http_sub_filter,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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{ ngx_string("sub_filter_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_sub_types,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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{ ngx_string("sub_filter_once"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_sub_loc_conf_t, once),
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_sub_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_sub_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_sub_create_conf, /* create location configuration */
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ngx_http_sub_merge_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_sub_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_sub_filter_module_ctx, /* module context */
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ngx_http_sub_filter_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_sub_header_filter(ngx_http_request_t *r)
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{
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ngx_str_t *type;
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ngx_uint_t i;
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ngx_http_sub_ctx_t *ctx;
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ngx_http_sub_loc_conf_t *slcf;
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slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
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if (slcf->match.len == 0
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|| r->headers_out.content_type.len == 0
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|| r->headers_out.content_length_n == 0)
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{
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return ngx_http_next_header_filter(r);
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}
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type = slcf->types->elts;
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for (i = 0; i < slcf->types->nelts; i++) {
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if (r->headers_out.content_type.len >= type[i].len
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&& ngx_strncasecmp(r->headers_out.content_type.data,
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type[i].data, type[i].len) == 0)
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{
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goto found;
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}
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}
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return ngx_http_next_header_filter(r);
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found:
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ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_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_sub_filter_module);
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ctx->match = slcf->match;
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ctx->last_out = &ctx->out;
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ctx->sub = slcf->sub;
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r->filter_need_in_memory = 1;
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if (r == r->main) {
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ngx_http_clear_content_length(r);
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ngx_http_clear_last_modified(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 ngx_int_t
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ngx_http_sub_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_buf_t *b;
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ngx_chain_t *cl;
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ngx_http_sub_ctx_t *ctx;
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ngx_http_sub_loc_conf_t *slcf;
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ctx = ngx_http_get_module_ctx(r, ngx_http_sub_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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if ((in == NULL
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&& ctx->buf == NULL
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&& ctx->in == NULL
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&& ctx->busy == NULL))
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{
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return ngx_http_next_body_filter(r, in);
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}
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if (ctx->once && (ctx->buf == NULL || ctx->in == NULL)) {
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if (ctx->busy) {
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if (ngx_http_sub_output(r, ctx) == NGX_ERROR) {
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return NGX_ERROR;
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}
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}
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return ngx_http_next_body_filter(r, in);
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}
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/* add the incoming chain to the chain ctx->in */
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if (in) {
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if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
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return NGX_ERROR;
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}
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}
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"http sub filter \"%V\"", &r->uri);
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while (ctx->in || ctx->buf) {
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if (ctx->buf == NULL ){
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ctx->buf = ctx->in->buf;
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ctx->in = ctx->in->next;
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ctx->pos = ctx->buf->pos;
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}
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if (ctx->state == sub_start_state) {
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ctx->copy_start = ctx->pos;
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ctx->copy_end = ctx->pos;
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}
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b = NULL;
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while (ctx->pos < ctx->buf->last) {
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"saved: %d state: %d", ctx->saved, ctx->state);
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rc = ngx_http_sub_parse(r, ctx);
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ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"parse: %d, looked: %d %p-%p",
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rc, ctx->looked, ctx->copy_start, ctx->copy_end);
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if (rc == NGX_ERROR) {
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return rc;
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}
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if (ctx->copy_start != ctx->copy_end) {
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"saved: %d", ctx->saved);
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if (ctx->saved) {
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if (ctx->free) {
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cl = ctx->free;
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ctx->free = ctx->free->next;
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b = cl->buf;
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ngx_memzero(b, sizeof(ngx_buf_t));
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} else {
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b = ngx_calloc_buf(r->pool);
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if (b == NULL) {
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return NGX_ERROR;
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}
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cl = ngx_alloc_chain_link(r->pool);
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if (cl == NULL) {
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return NGX_ERROR;
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}
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cl->buf = b;
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}
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b->memory = 1;
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b->pos = ctx->match.data;
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b->last = ctx->match.data + ctx->saved;
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*ctx->last_out = cl;
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ctx->last_out = &cl->next;
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ctx->saved = 0;
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}
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if (ctx->free) {
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cl = ctx->free;
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ctx->free = ctx->free->next;
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b = cl->buf;
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} else {
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b = ngx_alloc_buf(r->pool);
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if (b == NULL) {
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return NGX_ERROR;
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}
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cl = ngx_alloc_chain_link(r->pool);
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if (cl == NULL) {
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return NGX_ERROR;
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}
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cl->buf = b;
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}
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ngx_memcpy(b, ctx->buf, sizeof(ngx_buf_t));
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b->pos = ctx->copy_start;
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b->last = ctx->copy_end;
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b->shadow = NULL;
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b->last_buf = 0;
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b->recycled = 0;
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if (b->in_file) {
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b->file_last = b->file_pos + (b->last - ctx->buf->pos);
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b->file_pos += b->pos - ctx->buf->pos;
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}
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cl->next = NULL;
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*ctx->last_out = cl;
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ctx->last_out = &cl->next;
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}
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if (ctx->state == sub_start_state) {
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ctx->copy_start = ctx->pos;
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ctx->copy_end = ctx->pos;
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} else {
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ctx->copy_start = NULL;
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ctx->copy_end = NULL;
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}
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if (rc == NGX_AGAIN) {
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continue;
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}
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/* rc == NGX_OK */
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b = ngx_calloc_buf(r->pool);
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if (b == NULL) {
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return NGX_ERROR;
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}
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cl = ngx_alloc_chain_link(r->pool);
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if (cl == NULL) {
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return NGX_ERROR;
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}
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slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
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if (ctx->sub.data == NULL) {
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if (ngx_http_script_run(r, &ctx->sub, slcf->sub_lengths->elts,
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0, slcf->sub_values->elts)
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== NULL)
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{
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return NGX_ERROR;
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}
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}
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if (ctx->sub.len) {
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b->memory = 1;
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b->pos = ctx->sub.data;
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b->last = ctx->sub.data + ctx->sub.len;
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} else {
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b->sync = 1;
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}
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cl->buf = b;
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cl->next = NULL;
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*ctx->last_out = cl;
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ctx->last_out = &cl->next;
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ctx->once = slcf->once;
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continue;
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}
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if (ctx->buf->last_buf || ngx_buf_in_memory(ctx->buf)) {
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if (b == NULL) {
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if (ctx->free) {
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cl = ctx->free;
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ctx->free = ctx->free->next;
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b = cl->buf;
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ngx_memzero(b, sizeof(ngx_buf_t));
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} else {
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b = ngx_calloc_buf(r->pool);
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if (b == NULL) {
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return NGX_ERROR;
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}
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cl = ngx_alloc_chain_link(r->pool);
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if (cl == NULL) {
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return NGX_ERROR;
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}
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cl->buf = b;
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}
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b->sync = 1;
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cl->next = NULL;
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*ctx->last_out = cl;
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ctx->last_out = &cl->next;
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}
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b->last_buf = ctx->buf->last_buf;
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b->shadow = ctx->buf;
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b->recycled = ctx->buf->recycled;
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}
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ctx->buf = NULL;
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ctx->saved = ctx->looked;
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}
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if (ctx->out == NULL && ctx->busy == NULL) {
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return NGX_OK;
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}
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return ngx_http_sub_output(r, ctx);
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}
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static ngx_int_t
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ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
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{
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ngx_int_t rc;
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ngx_buf_t *b;
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ngx_chain_t *cl;
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#if 1
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b = NULL;
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for (cl = ctx->out; cl; cl = cl->next) {
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"sub out: %p %p", cl->buf, cl->buf->pos);
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if (cl->buf == b) {
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ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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"the same buf was used in sub");
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ngx_debug_point();
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return NGX_ERROR;
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}
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b = cl->buf;
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}
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#endif
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rc = ngx_http_next_body_filter(r, ctx->out);
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if (ctx->busy == NULL) {
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ctx->busy = ctx->out;
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} else {
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for (cl = ctx->busy; cl->next; cl = cl->next) { /* void */ }
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cl->next = ctx->out;
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}
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ctx->out = NULL;
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ctx->last_out = &ctx->out;
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while (ctx->busy) {
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cl = ctx->busy;
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b = cl->buf;
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if (ngx_buf_size(b) != 0) {
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break;
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}
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#if (NGX_HAVE_WRITE_ZEROCOPY)
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if (b->zerocopy_busy) {
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break;
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}
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#endif
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if (b->shadow) {
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b->shadow->pos = b->shadow->last;
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}
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ctx->busy = cl->next;
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if (ngx_buf_in_memory(b) || b->in_file) {
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/* add data bufs only to the free buf chain */
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cl->next = ctx->free;
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ctx->free = cl;
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}
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}
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if (ctx->in || ctx->buf) {
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r->buffered |= NGX_HTTP_SUB_BUFFERED;
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} else {
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r->buffered &= ~NGX_HTTP_SUB_BUFFERED;
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}
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return rc;
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}
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static ngx_int_t
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ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
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{
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u_char *p, *last, *copy_end, ch, match;
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size_t looked;
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ngx_http_sub_state_e state;
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if (ctx->once) {
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ctx->copy_start = ctx->pos;
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ctx->copy_end = ctx->buf->last;
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ctx->pos = ctx->buf->last;
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ctx->looked = 0;
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once");
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return NGX_AGAIN;
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}
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state = ctx->state;
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looked = ctx->looked;
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last = ctx->buf->last;
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copy_end = ctx->copy_end;
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for (p = ctx->pos; p < last; p++) {
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ch = *p;
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ch = ngx_tolower(ch);
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if (state == sub_start_state) {
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/* the tight loop */
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match = ctx->match.data[0];
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for ( ;; ) {
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if (ch == match) {
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copy_end = p;
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looked = 1;
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state = sub_match_state;
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goto match_started;
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}
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if (++p == last) {
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break;
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}
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ch = *p;
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ch = ngx_tolower(ch);
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}
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ctx->state = state;
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ctx->pos = p;
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ctx->looked = looked;
|
|
ctx->copy_end = p;
|
|
|
|
if (ctx->copy_start == NULL) {
|
|
ctx->copy_start = ctx->buf->pos;
|
|
}
|
|
|
|
return NGX_AGAIN;
|
|
|
|
match_started:
|
|
|
|
continue;
|
|
}
|
|
|
|
/* state == sub_match_state */
|
|
|
|
if (ch == ctx->match.data[looked]) {
|
|
looked++;
|
|
|
|
if (looked == ctx->match.len) {
|
|
if ((size_t) (p - ctx->pos) < looked) {
|
|
ctx->saved = 0;
|
|
}
|
|
|
|
ctx->state = sub_start_state;
|
|
ctx->pos = p + 1;
|
|
ctx->looked = 0;
|
|
ctx->copy_end = copy_end;
|
|
|
|
if (ctx->copy_start == NULL && copy_end) {
|
|
ctx->copy_start = ctx->buf->pos;
|
|
}
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
} else if (ch == ctx->match.data[0]) {
|
|
copy_end = p;
|
|
looked = 1;
|
|
|
|
} else {
|
|
copy_end = p;
|
|
looked = 0;
|
|
state = sub_start_state;
|
|
}
|
|
}
|
|
|
|
ctx->state = state;
|
|
ctx->pos = p;
|
|
ctx->looked = looked;
|
|
|
|
ctx->copy_end = (state == sub_start_state) ? p : copy_end;
|
|
|
|
if (ctx->copy_start == NULL && ctx->copy_end) {
|
|
ctx->copy_start = ctx->buf->pos;
|
|
}
|
|
|
|
return NGX_AGAIN;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
{
|
|
ngx_http_sub_loc_conf_t *slcf = conf;
|
|
|
|
ngx_str_t *value;
|
|
ngx_int_t n;
|
|
ngx_uint_t i;
|
|
ngx_http_script_compile_t sc;
|
|
|
|
if (slcf->match.len) {
|
|
return "is duplicate";
|
|
}
|
|
|
|
value = cf->args->elts;
|
|
|
|
slcf->match = value[1];
|
|
|
|
for (i = 0; i < value[1].len; i++) {
|
|
value[1].data[i] = ngx_tolower(value[1].data[i]);
|
|
}
|
|
|
|
n = ngx_http_script_variables_count(&value[2]);
|
|
|
|
if (n == 0) {
|
|
slcf->sub = value[2];
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
|
sc.cf = cf;
|
|
sc.source = &value[2];
|
|
sc.lengths = &slcf->sub_lengths;
|
|
sc.values = &slcf->sub_values;
|
|
sc.variables = n;
|
|
sc.complete_lengths = 1;
|
|
sc.complete_values = 1;
|
|
|
|
if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_http_sub_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
{
|
|
ngx_http_sub_loc_conf_t *slcf = conf;
|
|
|
|
ngx_str_t *value, *type;
|
|
ngx_uint_t i;
|
|
|
|
if (slcf->types == NULL) {
|
|
slcf->types = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
|
|
if (slcf->types == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
type = ngx_array_push(slcf->types);
|
|
if (type == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
type->len = sizeof("text/html") - 1;
|
|
type->data = (u_char *) "text/html";
|
|
}
|
|
|
|
value = cf->args->elts;
|
|
|
|
for (i = 1; i < cf->args->nelts; i++) {
|
|
|
|
if (ngx_strcmp(value[i].data, "text/html") == 0) {
|
|
continue;
|
|
}
|
|
|
|
type = ngx_array_push(slcf->types);
|
|
if (type == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
type->len = value[i].len;
|
|
|
|
type->data = ngx_palloc(cf->pool, type->len + 1);
|
|
if (type->data == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
ngx_cpystrn(type->data, value[i].data, type->len + 1);
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
|
|
static void *
|
|
ngx_http_sub_create_conf(ngx_conf_t *cf)
|
|
{
|
|
ngx_http_sub_loc_conf_t *slcf;
|
|
|
|
slcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_sub_loc_conf_t));
|
|
if (slcf == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
/*
|
|
* set by ngx_pcalloc():
|
|
*
|
|
* conf->match.len = 0;
|
|
* conf->match.data = NULL;
|
|
* conf->sub.len = 0;
|
|
* conf->sub.data = NULL;
|
|
* conf->sub_lengths = NULL;
|
|
* conf->sub_values = NULL;
|
|
* conf->types = NULL;
|
|
*/
|
|
|
|
slcf->once = NGX_CONF_UNSET;
|
|
|
|
return slcf;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_http_sub_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
{
|
|
ngx_http_sub_loc_conf_t *prev = parent;
|
|
ngx_http_sub_loc_conf_t *conf = child;
|
|
|
|
ngx_str_t *type;
|
|
|
|
ngx_conf_merge_value(conf->once, prev->once, 1);
|
|
ngx_conf_merge_str_value(conf->match, prev->match, "");
|
|
|
|
if (conf->sub.data == NULL && conf->sub_lengths == NULL) {
|
|
conf->sub = prev->sub;
|
|
conf->sub_lengths = prev->sub_lengths;
|
|
conf->sub_values = prev->sub_values;
|
|
}
|
|
|
|
if (conf->types == NULL) {
|
|
if (prev->types == NULL) {
|
|
conf->types = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
|
|
if (conf->types == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
type = ngx_array_push(conf->types);
|
|
if (type == NULL) {
|
|
return NGX_CONF_ERROR;
|
|
}
|
|
|
|
type->len = sizeof("text/html") - 1;
|
|
type->data = (u_char *) "text/html";
|
|
|
|
} else {
|
|
conf->types = prev->types;
|
|
}
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_http_sub_filter_init(ngx_conf_t *cf)
|
|
{
|
|
ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
ngx_http_top_header_filter = ngx_http_sub_header_filter;
|
|
|
|
ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
ngx_http_top_body_filter = ngx_http_sub_body_filter;
|
|
|
|
return NGX_OK;
|
|
}
|