nginx-quic/src/http/modules/ngx_http_sub_filter_module.c

717 lines
18 KiB
C

/*
* 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 match;
ngx_http_complex_value_t value;
ngx_hash_t types;
ngx_flag_t once;
ngx_array_t *types_keys;
} ngx_http_sub_loc_conf_t;
typedef enum {
sub_start_state = 0,
sub_match_state,
} ngx_http_sub_state_e;
typedef struct {
ngx_str_t match;
ngx_str_t saved;
ngx_str_t looked;
ngx_uint_t once; /* unsigned once:1 */
ngx_buf_t *buf;
u_char *pos;
u_char *copy_start;
u_char *copy_end;
ngx_chain_t *in;
ngx_chain_t *out;
ngx_chain_t **last_out;
ngx_chain_t *busy;
ngx_chain_t *free;
ngx_str_t sub;
ngx_uint_t state;
} ngx_http_sub_ctx_t;
static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r,
ngx_http_sub_ctx_t *ctx);
static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r,
ngx_http_sub_ctx_t *ctx);
static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_http_sub_create_conf(ngx_conf_t *cf);
static char *ngx_http_sub_merge_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf);
static ngx_command_t ngx_http_sub_filter_commands[] = {
{ ngx_string("sub_filter"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
ngx_http_sub_filter,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("sub_filter_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_sub_loc_conf_t, types_keys),
&ngx_http_html_default_types[0] },
{ ngx_string("sub_filter_once"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_sub_loc_conf_t, once),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_sub_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_sub_filter_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_sub_create_conf, /* create location configuration */
ngx_http_sub_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_sub_filter_module = {
NGX_MODULE_V1,
&ngx_http_sub_filter_module_ctx, /* module context */
ngx_http_sub_filter_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_sub_header_filter(ngx_http_request_t *r)
{
ngx_http_sub_ctx_t *ctx;
ngx_http_sub_loc_conf_t *slcf;
slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
if (slcf->match.len == 0
|| r->headers_out.content_length_n == 0
|| ngx_http_test_content_type(r, &slcf->types) == NULL)
{
return ngx_http_next_header_filter(r);
}
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ctx->saved.data = ngx_pnalloc(r->pool, slcf->match.len);
if (ctx->saved.data == NULL) {
return NGX_ERROR;
}
ctx->looked.data = ngx_pnalloc(r->pool, slcf->match.len);
if (ctx->looked.data == NULL) {
return NGX_ERROR;
}
ngx_http_set_ctx(r, ctx, ngx_http_sub_filter_module);
ctx->match = slcf->match;
ctx->last_out = &ctx->out;
r->filter_need_in_memory = 1;
if (r == r->main) {
ngx_http_clear_content_length(r);
ngx_http_clear_last_modified(r);
}
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_sub_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t *cl;
ngx_http_sub_ctx_t *ctx;
ngx_http_sub_loc_conf_t *slcf;
ctx = ngx_http_get_module_ctx(r, ngx_http_sub_filter_module);
if (ctx == NULL) {
return ngx_http_next_body_filter(r, in);
}
if ((in == NULL
&& ctx->buf == NULL
&& ctx->in == NULL
&& ctx->busy == NULL))
{
return ngx_http_next_body_filter(r, in);
}
if (ctx->once && (ctx->buf == NULL || ctx->in == NULL)) {
if (ctx->busy) {
if (ngx_http_sub_output(r, ctx) == NGX_ERROR) {
return NGX_ERROR;
}
}
return ngx_http_next_body_filter(r, in);
}
/* add the incoming chain to the chain ctx->in */
if (in) {
if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) {
return NGX_ERROR;
}
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http sub filter \"%V\"", &r->uri);
while (ctx->in || ctx->buf) {
if (ctx->buf == NULL) {
ctx->buf = ctx->in->buf;
ctx->in = ctx->in->next;
ctx->pos = ctx->buf->pos;
}
if (ctx->state == sub_start_state) {
ctx->copy_start = ctx->pos;
ctx->copy_end = ctx->pos;
}
b = NULL;
while (ctx->pos < ctx->buf->last) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"saved: \"%V\" state: %d", &ctx->saved, ctx->state);
rc = ngx_http_sub_parse(r, ctx);
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"parse: %d, looked: \"%V\" %p-%p",
rc, &ctx->looked, ctx->copy_start, ctx->copy_end);
if (rc == NGX_ERROR) {
return rc;
}
if (ctx->copy_start != ctx->copy_end) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"saved: \"%V\"", &ctx->saved);
if (ctx->saved.len) {
if (ctx->free) {
cl = ctx->free;
ctx->free = ctx->free->next;
b = cl->buf;
ngx_memzero(b, sizeof(ngx_buf_t));
} else {
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
}
b->pos = ngx_pnalloc(r->pool, ctx->saved.len);
if (b->pos == NULL) {
return NGX_ERROR;
}
ngx_memcpy(b->pos, ctx->saved.data, ctx->saved.len);
b->last = b->pos + ctx->saved.len;
b->memory = 1;
*ctx->last_out = cl;
ctx->last_out = &cl->next;
ctx->saved.len = 0;
}
if (ctx->free) {
cl = ctx->free;
ctx->free = ctx->free->next;
b = cl->buf;
} else {
b = ngx_alloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
}
ngx_memcpy(b, ctx->buf, sizeof(ngx_buf_t));
b->pos = ctx->copy_start;
b->last = ctx->copy_end;
b->shadow = NULL;
b->last_buf = 0;
b->recycled = 0;
if (b->in_file) {
b->file_last = b->file_pos + (b->last - ctx->buf->pos);
b->file_pos += b->pos - ctx->buf->pos;
}
cl->next = NULL;
*ctx->last_out = cl;
ctx->last_out = &cl->next;
}
if (ctx->state == sub_start_state) {
ctx->copy_start = ctx->pos;
ctx->copy_end = ctx->pos;
} else {
ctx->copy_start = NULL;
ctx->copy_end = NULL;
}
if (rc == NGX_AGAIN) {
continue;
}
/* rc == NGX_OK */
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
if (ctx->sub.data == NULL) {
if (ngx_http_complex_value(r, &slcf->value, &ctx->sub)
!= NGX_OK)
{
return NGX_ERROR;
}
}
if (ctx->sub.len) {
b->memory = 1;
b->pos = ctx->sub.data;
b->last = ctx->sub.data + ctx->sub.len;
} else {
b->sync = 1;
}
cl->buf = b;
cl->next = NULL;
*ctx->last_out = cl;
ctx->last_out = &cl->next;
ctx->once = slcf->once;
continue;
}
if (ctx->buf->last_buf || ngx_buf_in_memory(ctx->buf)) {
if (b == NULL) {
if (ctx->free) {
cl = ctx->free;
ctx->free = ctx->free->next;
b = cl->buf;
ngx_memzero(b, sizeof(ngx_buf_t));
} else {
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
}
b->sync = 1;
cl->next = NULL;
*ctx->last_out = cl;
ctx->last_out = &cl->next;
}
b->last_buf = ctx->buf->last_buf;
b->shadow = ctx->buf;
b->recycled = ctx->buf->recycled;
}
ctx->buf = NULL;
ctx->saved.len = ctx->looked.len;
ngx_memcpy(ctx->saved.data, ctx->looked.data, ctx->looked.len);
}
if (ctx->out == NULL && ctx->busy == NULL) {
return NGX_OK;
}
return ngx_http_sub_output(r, ctx);
}
static ngx_int_t
ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t *cl;
#if 1
b = NULL;
for (cl = ctx->out; cl; cl = cl->next) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"sub out: %p %p", cl->buf, cl->buf->pos);
if (cl->buf == b) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"the same buf was used in sub");
ngx_debug_point();
return NGX_ERROR;
}
b = cl->buf;
}
#endif
rc = ngx_http_next_body_filter(r, ctx->out);
if (ctx->busy == NULL) {
ctx->busy = ctx->out;
} else {
for (cl = ctx->busy; cl->next; cl = cl->next) { /* void */ }
cl->next = ctx->out;
}
ctx->out = NULL;
ctx->last_out = &ctx->out;
while (ctx->busy) {
cl = ctx->busy;
b = cl->buf;
if (ngx_buf_size(b) != 0) {
break;
}
if (b->shadow) {
b->shadow->pos = b->shadow->last;
}
ctx->busy = cl->next;
if (ngx_buf_in_memory(b) || b->in_file) {
/* add data bufs only to the free buf chain */
cl->next = ctx->free;
ctx->free = cl;
}
}
if (ctx->in || ctx->buf) {
r->buffered |= NGX_HTTP_SUB_BUFFERED;
} else {
r->buffered &= ~NGX_HTTP_SUB_BUFFERED;
}
return rc;
}
static ngx_int_t
ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
{
u_char *p, *last, *copy_end, ch, match;
size_t looked;
ngx_http_sub_state_e state;
if (ctx->once) {
ctx->copy_start = ctx->pos;
ctx->copy_end = ctx->buf->last;
ctx->pos = ctx->buf->last;
ctx->looked.len = 0;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once");
return NGX_AGAIN;
}
state = ctx->state;
looked = ctx->looked.len;
last = ctx->buf->last;
copy_end = ctx->copy_end;
for (p = ctx->pos; p < last; p++) {
ch = *p;
ch = ngx_tolower(ch);
if (state == sub_start_state) {
/* the tight loop */
match = ctx->match.data[0];
for ( ;; ) {
if (ch == match) {
copy_end = p;
ctx->looked.data[0] = *p;
looked = 1;
state = sub_match_state;
goto match_started;
}
if (++p == last) {
break;
}
ch = *p;
ch = ngx_tolower(ch);
}
ctx->state = state;
ctx->pos = p;
ctx->looked.len = 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]) {
ctx->looked.data[looked] = *p;
looked++;
if (looked == ctx->match.len) {
if ((size_t) (p - ctx->pos) < looked) {
ctx->saved.len = 0;
}
ctx->state = sub_start_state;
ctx->pos = p + 1;
ctx->looked.len = 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;
ctx->looked.data[0] = *p;
looked = 1;
} else {
copy_end = p;
looked = 0;
state = sub_start_state;
}
}
ctx->state = state;
ctx->pos = p;
ctx->looked.len = 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_http_compile_complex_value_t ccv;
if (slcf->match.data) {
return "is duplicate";
}
value = cf->args->elts;
ngx_strlow(value[1].data, value[1].data, value[1].len);
slcf->match = value[1];
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &value[2];
ccv.complex_value = &slcf->value;
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
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 NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->match = { 0, NULL };
* conf->sub = { 0, NULL };
* conf->sub_lengths = NULL;
* conf->sub_values = NULL;
* conf->types = { NULL };
* conf->types_keys = 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_conf_merge_value(conf->once, prev->once, 1);
ngx_conf_merge_str_value(conf->match, prev->match, "");
if (conf->value.value.data == NULL) {
conf->value = prev->value;
}
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;
}
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;
}