Mercurial > hg > nginx-vendor-0-7
view src/http/modules/ngx_http_charset_filter_module.c @ 145:85a84f8da62b
Added tag NGINX_0_3_19 for changeset e1c6ac408b68
author | Igor Sysoev <http://sysoev.ru> |
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date | Wed, 28 Dec 2005 00:00:00 +0300 |
parents | cf3d6edb3ad6 |
children | 36af50a5582d |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #define NGX_HTTP_NO_CHARSET -2 typedef struct { char **tables; ngx_str_t name; ngx_uint_t utf8; /* unsigned utf8:1; */ } ngx_http_charset_t; typedef struct { ngx_int_t src; ngx_int_t dst; } ngx_http_charset_recode_t; typedef struct { ngx_int_t src; ngx_int_t dst; char *src2dst; char *dst2src; } ngx_http_charset_tables_t; typedef struct { ngx_array_t charsets; /* ngx_http_charset_t */ ngx_array_t tables; /* ngx_http_charset_tables_t */ ngx_array_t recodes; /* ngx_http_charset_recode_t */ } ngx_http_charset_main_conf_t; typedef struct { ngx_int_t charset; ngx_int_t source_charset; } ngx_http_charset_loc_conf_t; typedef struct { ngx_int_t server; ngx_int_t client; } ngx_http_charset_ctx_t; static ngx_uint_t ngx_http_charset_recode(ngx_buf_t *b, char *table); static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf); static char *ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name); static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle); static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf); static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_http_charset_postconfiguration(ngx_conf_t *cf); static ngx_command_t ngx_http_charset_filter_commands[] = { { ngx_string("charset"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF |NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1, ngx_http_set_charset_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_charset_loc_conf_t, charset), NULL }, { ngx_string("source_charset"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF |NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1, ngx_http_set_charset_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_charset_loc_conf_t, source_charset), NULL }, { ngx_string("charset_map"), NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, ngx_charset_map_block, NGX_HTTP_MAIN_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_charset_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_charset_postconfiguration, /* postconfiguration */ ngx_http_charset_create_main_conf, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_charset_create_loc_conf, /* create location configuration */ ngx_http_charset_merge_loc_conf /* merge location configuration */ }; ngx_module_t ngx_http_charset_filter_module = { NGX_MODULE_V1, &ngx_http_charset_filter_module_ctx, /* module context */ ngx_http_charset_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ ngx_http_charset_filter_init, /* 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_charset_header_filter(ngx_http_request_t *r) { ngx_http_charset_t *charsets; ngx_http_charset_ctx_t *ctx; ngx_http_charset_loc_conf_t *lcf; ngx_http_charset_main_conf_t *mcf; mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module); lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module); if (lcf->charset == NGX_HTTP_NO_CHARSET) { return ngx_http_next_header_filter(r); } if (r->headers_out.content_type.len == 0) { return ngx_http_next_header_filter(r); } if (ngx_strncasecmp(r->headers_out.content_type.data, "text/", 5) != 0 && ngx_strncasecmp(r->headers_out.content_type.data, "application/x-javascript", 24) != 0) { return ngx_http_next_header_filter(r); } if (r->main == r && ngx_strstr(r->headers_out.content_type.data, "charset") != NULL) { return ngx_http_next_header_filter(r); } if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY || r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY) { /* * do not set charset for the redirect because NN 4.x uses this * charset instead of the next page charset */ r->headers_out.charset.len = 0; return ngx_http_next_header_filter(r); } if (r->headers_out.charset.len) { return ngx_http_next_header_filter(r); } charsets = mcf->charsets.elts; r->headers_out.charset = charsets[lcf->charset].name; r->utf8 = charsets[lcf->charset].utf8; if (lcf->source_charset == NGX_CONF_UNSET || lcf->source_charset == lcf->charset) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_charset_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_charset_filter_module); r->filter_need_in_memory = 1; return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_charset_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { char *table; ngx_chain_t *cl; ngx_http_charset_t *charsets; ngx_http_charset_ctx_t *ctx; ngx_http_charset_loc_conf_t *lcf; ngx_http_charset_main_conf_t *mcf; ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module); if (ctx == NULL) { return ngx_http_next_body_filter(r, in); } mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module); lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module); charsets = mcf->charsets.elts; table = charsets[lcf->source_charset].tables[lcf->charset]; for (cl = in; cl; cl = cl->next) { ngx_http_charset_recode(cl->buf, table); } return ngx_http_next_body_filter(r, in); } static ngx_uint_t ngx_http_charset_recode(ngx_buf_t *b, char *table) { u_char *p; ngx_uint_t change; change = 0; for (p = b->pos; p < b->last; p++) { if (*p != table[*p]) { change = 1; break; } } if (change) { while (p < b->last) { *p = table[*p]; p++; } b->in_file = 0; } return change; } static char * ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_charset_main_conf_t *mcf = conf; char *rv; ngx_int_t src, dst; ngx_uint_t i; ngx_str_t *value; ngx_conf_t pvcf; ngx_http_charset_tables_t *table; value = cf->args->elts; src = ngx_http_add_charset(&mcf->charsets, &value[1]); if (src == NGX_ERROR) { return NGX_CONF_ERROR; } dst = ngx_http_add_charset(&mcf->charsets, &value[2]); if (dst == NGX_ERROR) { return NGX_CONF_ERROR; } if (src == dst) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"charset_map\" between the same charsets " "\"%V\" and \"%V\"", &value[1], &value[2]); return NGX_CONF_ERROR; } table = mcf->tables.elts; for (i = 0; i < mcf->tables.nelts; i++) { if ((src == table->src && dst == table->dst) || (src == table->dst && dst == table->src)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate \"charset_map\" between " "\"%V\" and \"%V\"", &value[1], &value[2]); return NGX_CONF_ERROR; } } table = ngx_array_push(&mcf->tables); if (table == NULL) { return NGX_CONF_ERROR; } table->src = src; table->dst = dst; table->src2dst = ngx_palloc(cf->pool, 256); if (table->src2dst == NULL) { return NGX_CONF_ERROR; } table->dst2src = ngx_palloc(cf->pool, 256); if (table->dst2src == NULL) { return NGX_CONF_ERROR; } for (i = 0; i < 128; i++) { table->src2dst[i] = (char) i; table->dst2src[i] = (char) i; } for (/* void */; i < 256; i++) { table->src2dst[i] = '?'; table->dst2src[i] = '?'; } pvcf = *cf; cf->ctx = table; cf->handler = ngx_charset_map; cf->handler_conf = conf; rv = ngx_conf_parse(cf, NULL); *cf = pvcf; return rv; } static char * ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) { ngx_int_t src, dst; ngx_str_t *value; ngx_http_charset_tables_t *table; if (cf->args->nelts != 2) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number"); return NGX_CONF_ERROR; } value = cf->args->elts; src = ngx_hextoi(value[0].data, value[0].len); if (src == NGX_ERROR || src > 255) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid value \"%V\"", &value[0]); return NGX_CONF_ERROR; } dst = ngx_hextoi(value[1].data, value[1].len); if (dst == NGX_ERROR || dst > 255) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid value \"%V\"", &value[1]); return NGX_CONF_ERROR; } table = cf->ctx; table->src2dst[src] = (char) dst; table->dst2src[dst] = (char) src; return NGX_CONF_OK; } static char * ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { char *p = conf; ngx_int_t *cp; ngx_str_t *value; ngx_http_charset_main_conf_t *mcf; cp = (ngx_int_t *) (p + cmd->offset); if (*cp != NGX_CONF_UNSET) { return "is duplicate"; } value = cf->args->elts; if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, charset) && ngx_strcmp(value[1].data, "off") == 0) { *cp = NGX_HTTP_NO_CHARSET; return NGX_CONF_OK; } mcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_charset_filter_module); *cp = ngx_http_add_charset(&mcf->charsets, &value[1]); if (*cp == NGX_ERROR) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name) { ngx_uint_t i; ngx_http_charset_t *c; c = charsets->elts; for (i = 0; i < charsets->nelts; i++) { if (name->len != c[i].name.len) { continue; } if (ngx_strcasecmp(name->data, c[i].name.data) == 0) { break; } } if (i < charsets->nelts) { return i; } c = ngx_array_push(charsets); if (c == NULL) { return NGX_ERROR; } c->tables = NULL; c->name = *name; if (ngx_strcasecmp(name->data, "utf-8") == 0) { c->utf8 = 1; } return i; } static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_charset_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_charset_body_filter; return NGX_OK; } static void * ngx_http_charset_create_main_conf(ngx_conf_t *cf) { ngx_http_charset_main_conf_t *mcf; mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t)); if (mcf == NULL) { return NGX_CONF_ERROR; } if (ngx_array_init(&mcf->charsets, cf->pool, 2, sizeof(ngx_http_charset_t)) == NGX_ERROR) { return NGX_CONF_ERROR; } if (ngx_array_init(&mcf->tables, cf->pool, 1, sizeof(ngx_http_charset_tables_t)) == NGX_ERROR) { return NGX_CONF_ERROR; } if (ngx_array_init(&mcf->recodes, cf->pool, 2, sizeof(ngx_http_charset_recode_t)) == NGX_ERROR) { return NGX_CONF_ERROR; } return mcf; } static void * ngx_http_charset_create_loc_conf(ngx_conf_t *cf) { ngx_http_charset_loc_conf_t *lcf; lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t)); if (lcf == NULL) { return NGX_CONF_ERROR; } lcf->charset = NGX_CONF_UNSET; lcf->source_charset = NGX_CONF_UNSET; return lcf; } static char * ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_charset_loc_conf_t *prev = parent; ngx_http_charset_loc_conf_t *conf = child; ngx_uint_t i; ngx_http_charset_recode_t *recode; ngx_http_charset_main_conf_t *mcf; ngx_conf_merge_value(conf->charset, prev->charset, NGX_HTTP_NO_CHARSET); if (conf->source_charset == NGX_CONF_UNSET) { conf->source_charset = prev->source_charset; } if (conf->charset == NGX_HTTP_NO_CHARSET || conf->source_charset == NGX_CONF_UNSET || conf->charset == conf->source_charset) { return NGX_CONF_OK; } mcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_charset_filter_module); recode = mcf->recodes.elts; for (i = 0; i < mcf->recodes.nelts; i++) { if (conf->source_charset == recode[i].src && conf->charset == recode[i].dst) { return NGX_CONF_OK; } } recode = ngx_array_push(&mcf->recodes); if (recode == NULL) { return NGX_CONF_ERROR; } recode->src = conf->source_charset; recode->dst = conf->charset; return NGX_CONF_OK; } static ngx_int_t ngx_http_charset_postconfiguration(ngx_conf_t *cf) { ngx_int_t c; ngx_uint_t i, t; ngx_http_charset_t *charset; ngx_http_charset_recode_t *recode; ngx_http_charset_tables_t *tables; ngx_http_charset_main_conf_t *mcf; mcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_charset_filter_module); recode = mcf->recodes.elts; tables = mcf->tables.elts; charset = mcf->charsets.elts; for (i = 0; i < mcf->recodes.nelts; i++) { c = recode[i].src; charset[c].tables = ngx_pcalloc(cf->pool, sizeof(char *) * mcf->charsets.nelts); if (charset[c].tables == NULL) { return NGX_ERROR; } for (t = 0; t < mcf->tables.nelts; t++) { if (c == tables[t].src && recode[i].dst == tables[t].dst) { charset[c].tables[tables[t].dst] = tables[t].src2dst; goto next; } if (c == tables[t].dst && recode[i].dst == tables[t].src) { charset[c].tables[tables[t].src] = tables[t].dst2src; goto next; } } ngx_log_error(NGX_LOG_EMERG, cf->log, 0, " no \"charset_map\" between the charsets " "\"%V\" and \"%V\"", &charset[c].name, &charset[recode[i].dst].name); return NGX_ERROR; next: continue; } return NGX_OK; }