Mercurial > hg > nginx-quic
diff src/http/modules/ngx_http_sub_filter_module.c @ 1172:383ae25c3171
ngx_http_sub_filter_module
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 19 Apr 2007 17:54:23 +0000 |
parents | |
children | 76fe59c6fafb 54377021b936 |
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new file mode 100644 --- /dev/null +++ b/src/http/modules/ngx_http_sub_filter_module.c @@ -0,0 +1,794 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +typedef struct { + ngx_str_t match; + ngx_str_t sub; + + ngx_array_t *types; /* array of ngx_str_t */ + + ngx_array_t *sub_lengths; + ngx_array_t *sub_values; + + ngx_flag_t once; +} 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_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; + size_t saved; + size_t looked; +} 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 char *ngx_http_sub_types(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_sub_types, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + { 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_str_t *type; + ngx_uint_t i; + 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_type.len == 0 + || r->headers_out.content_length_n == 0) + { + return ngx_http_next_header_filter(r); + } + + type = slcf->types->elts; + for (i = 0; i < slcf->types->nelts; i++) { + if (r->headers_out.content_type.len >= type[i].len + && ngx_strncasecmp(r->headers_out.content_type.data, + type[i].data, type[i].len) == 0) + { + goto found; + } + } + + return ngx_http_next_header_filter(r); + +found: + + ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_ctx_t)); + if (ctx == NULL) { + return NGX_ERROR; + } + + ngx_http_set_ctx(r, ctx, ngx_http_sub_filter_module); + + ctx->match = slcf->match; + ctx->last_out = &ctx->out; + ctx->sub = slcf->sub; + + 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_ERROR) { + 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: %d 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: %d %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: %d", ctx->saved); + + if (ctx->saved) { + + 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->memory = 1; + b->pos = ctx->match.data; + b->last = ctx->match.data + ctx->saved; + + *ctx->last_out = cl; + ctx->last_out = &cl->next; + + ctx->saved = 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 - b->start); + b->file_pos += b->pos - b->start; + } + + 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_script_run(r, &ctx->sub, slcf->sub_lengths->elts, + 0, slcf->sub_values->elts) + == NULL) + { + return NGX_ERROR; + } + } + + b->memory = 1; + b->pos = ctx->sub.data; + b->last = ctx->sub.data + ctx->sub.len; + + 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 = ctx->looked; + } + + 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 (NGX_HAVE_WRITE_ZEROCOPY) + if (b->zerocopy_busy) { + break; + } +#endif + + 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 = 0; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once"); + + return NGX_AGAIN; + } + + state = ctx->state; + looked = ctx->looked; + 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; + looked = 1; + state = sub_match_state; + + goto match_started; + } + + if (++p == last) { + break; + } + + ch = *p; + ch = ngx_tolower(ch); + } + + ctx->pos = p; + 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) { + ctx->state = sub_start_state; + ctx->pos = p + 1; + ctx->looked = looked; + 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; +}