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50
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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78
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12 #define NGX_HTTP_NO_CHARSET -2
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13
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14
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50
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15 typedef struct {
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16 char **tables;
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17 ngx_str_t name;
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72
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18
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78
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19 ngx_uint_t utf8; /* unsigned utf8:1; */
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50
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20 } ngx_http_charset_t;
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21
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22
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23 typedef struct {
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72
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24 ngx_int_t src;
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25 ngx_int_t dst;
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78
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26 } ngx_http_charset_recode_t;
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27
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28
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29 typedef struct {
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30 ngx_int_t src;
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31 ngx_int_t dst;
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72
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32 char *src2dst;
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33 char *dst2src;
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50
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34 } ngx_http_charset_tables_t;
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35
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36
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37 typedef struct {
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38 ngx_array_t charsets; /* ngx_http_charset_t */
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39 ngx_array_t tables; /* ngx_http_charset_tables_t */
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78
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40 ngx_array_t recodes; /* ngx_http_charset_recode_t */
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50
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41 } ngx_http_charset_main_conf_t;
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42
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43
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44 typedef struct {
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78
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45 ngx_int_t charset;
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72
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46 ngx_int_t source_charset;
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50
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47 } ngx_http_charset_loc_conf_t;
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48
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49
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50 typedef struct {
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72
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51 ngx_int_t server;
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52 ngx_int_t client;
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50
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53 } ngx_http_charset_ctx_t;
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54
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55
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78
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56 static ngx_uint_t ngx_http_charset_recode(ngx_buf_t *b, char *table);
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50
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57
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58 static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd,
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59 void *conf);
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60 static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
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61
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62 static char *ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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63 void *conf);
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64 static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name);
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65
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66 static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle);
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67
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68 static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf);
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69 static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf);
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70 static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf,
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71 void *parent, void *child);
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78
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72 static ngx_int_t ngx_http_charset_postconfiguration(ngx_conf_t *cf);
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50
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73
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74
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75 static ngx_command_t ngx_http_charset_filter_commands[] = {
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76
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78
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77 { ngx_string("charset"),
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78 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
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79 |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
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80 ngx_http_set_charset_slot,
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81 NGX_HTTP_LOC_CONF_OFFSET,
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82 offsetof(ngx_http_charset_loc_conf_t, charset),
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83 NULL },
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84
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85 { ngx_string("source_charset"),
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86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
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87 |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
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88 ngx_http_set_charset_slot,
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89 NGX_HTTP_LOC_CONF_OFFSET,
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90 offsetof(ngx_http_charset_loc_conf_t, source_charset),
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91 NULL },
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92
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50
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93 { ngx_string("charset_map"),
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94 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
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95 ngx_charset_map_block,
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96 NGX_HTTP_MAIN_CONF_OFFSET,
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97 0,
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98 NULL },
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99
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100 ngx_null_command
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101 };
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102
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103
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104 static ngx_http_module_t ngx_http_charset_filter_module_ctx = {
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58
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105 NULL, /* preconfiguration */
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78
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106 ngx_http_charset_postconfiguration, /* postconfiguration */
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107
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108 ngx_http_charset_create_main_conf, /* create main configuration */
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78
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109 NULL, /* init main configuration */
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110
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111 NULL, /* create server configuration */
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112 NULL, /* merge server configuration */
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113
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114 ngx_http_charset_create_loc_conf, /* create location configuration */
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115 ngx_http_charset_merge_loc_conf /* merge location configuration */
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116 };
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117
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118
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119 ngx_module_t ngx_http_charset_filter_module = {
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58
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120 NGX_MODULE_V1,
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121 &ngx_http_charset_filter_module_ctx, /* module context */
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122 ngx_http_charset_filter_commands, /* module directives */
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123 NGX_HTTP_MODULE, /* module type */
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124 ngx_http_charset_filter_init, /* init module */
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125 NULL /* init process */
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126 };
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127
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128
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129 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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130 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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131
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132
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133 static ngx_int_t
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134 ngx_http_charset_header_filter(ngx_http_request_t *r)
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135 {
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136 ngx_http_charset_t *charsets;
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137 ngx_http_charset_ctx_t *ctx;
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138 ngx_http_charset_loc_conf_t *lcf;
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139 ngx_http_charset_main_conf_t *mcf;
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140
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141 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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142 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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143
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78
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144 if (lcf->charset == NGX_HTTP_NO_CHARSET) {
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145 return ngx_http_next_header_filter(r);
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146 }
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147
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58
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148 if (r->headers_out.content_type.len == 0) {
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149 return ngx_http_next_header_filter(r);
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150 }
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151
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58
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152 if (ngx_strncasecmp(r->headers_out.content_type.data, "text/", 5) != 0
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153 && ngx_strncasecmp(r->headers_out.content_type.data,
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154 "application/x-javascript", 24) != 0)
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50
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155 {
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156 return ngx_http_next_header_filter(r);
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157 }
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158
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58
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159 if (ngx_strstr(r->headers_out.content_type.data, "charset") != NULL)
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160 {
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161 return ngx_http_next_header_filter(r);
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162 }
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163
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164 if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY
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165 || r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY)
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166 {
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167 /*
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168 * do not set charset for the redirect because NN 4.x uses this
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169 * charset instead of the next page charset
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170 */
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171
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172 r->headers_out.charset.len = 0;
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173 return ngx_http_next_header_filter(r);
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174 }
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175
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176 if (r->headers_out.charset.len) {
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177 return ngx_http_next_header_filter(r);
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178 }
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179
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180 charsets = mcf->charsets.elts;
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78
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181 r->headers_out.charset = charsets[lcf->charset].name;
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182 r->utf8 = charsets[lcf->charset].utf8;
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50
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183
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78
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184 if (lcf->source_charset == NGX_CONF_UNSET
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185 || lcf->source_charset == lcf->charset)
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186 {
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50
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187 return ngx_http_next_header_filter(r);
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188 }
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189
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190
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191 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_charset_ctx_t));
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192 if (ctx == NULL) {
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193 return NGX_ERROR;
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194 }
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195
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196 ngx_http_set_ctx(r, ctx, ngx_http_charset_filter_module);
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197
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198
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199 r->filter_need_in_memory = 1;
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200
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201 return ngx_http_next_header_filter(r);
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202 }
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203
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204
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205 static ngx_int_t
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206 ngx_http_charset_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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207 {
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208 char *table;
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209 ngx_chain_t *cl;
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210 ngx_http_charset_t *charsets;
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211 ngx_http_charset_ctx_t *ctx;
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212 ngx_http_charset_loc_conf_t *lcf;
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213 ngx_http_charset_main_conf_t *mcf;
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214
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215 ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module);
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216
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217 if (ctx == NULL) {
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218 return ngx_http_next_body_filter(r, in);
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219 }
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220
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221 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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222 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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223
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224 charsets = mcf->charsets.elts;
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78
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225 table = charsets[lcf->source_charset].tables[lcf->charset];
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226
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227 for (cl = in; cl; cl = cl->next) {
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228 ngx_http_charset_recode(cl->buf, table);
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50
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229 }
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230
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231 return ngx_http_next_body_filter(r, in);
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232 }
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233
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234
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235 static ngx_uint_t
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78
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236 ngx_http_charset_recode(ngx_buf_t *b, char *table)
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50
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237 {
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238 u_char *p;
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239 ngx_uint_t change;
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240
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241 change = 0;
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242
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243 for (p = b->pos; p < b->last; p++) {
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244 if (*p != table[*p]) {
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245 change = 1;
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246 break;
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247 }
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248 }
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249
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250 if (change) {
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251
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252 while (p < b->last) {
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253 *p = table[*p];
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254 p++;
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255 }
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256
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257 b->in_file = 0;
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258 }
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259
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260 return change;
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261 }
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262
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263
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264 static char *
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265 ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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266 {
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267 ngx_http_charset_main_conf_t *mcf = conf;
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268
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269 char *rv;
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270 ngx_int_t src, dst;
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271 ngx_uint_t i;
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272 ngx_str_t *value;
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273 ngx_conf_t pvcf;
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274 ngx_http_charset_tables_t *table;
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275
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276 value = cf->args->elts;
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277
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278 src = ngx_http_add_charset(&mcf->charsets, &value[1]);
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279 if (src == NGX_ERROR) {
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280 return NGX_CONF_ERROR;
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281 }
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282
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283 dst = ngx_http_add_charset(&mcf->charsets, &value[2]);
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284 if (dst == NGX_ERROR) {
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285 return NGX_CONF_ERROR;
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286 }
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287
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288 if (src == dst) {
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289 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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290 "\"charset_map\" between the same charsets "
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291 "\"%V\" and \"%V\"", &value[1], &value[2]);
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292 return NGX_CONF_ERROR;
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293 }
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294
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295 table = mcf->tables.elts;
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296 for (i = 0; i < mcf->tables.nelts; i++) {
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297 if ((src == table->src && dst == table->dst)
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298 || (src == table->dst && dst == table->src))
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299 {
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300 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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301 "duplicate \"charset_map\" between "
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302 "\"%V\" and \"%V\"", &value[1], &value[2]);
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303 return NGX_CONF_ERROR;
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304 }
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305 }
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306
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307 table = ngx_array_push(&mcf->tables);
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308 if (table == NULL) {
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309 return NGX_CONF_ERROR;
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310 }
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311
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312 table->src = src;
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313 table->dst = dst;
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314
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315 table->src2dst = ngx_palloc(cf->pool, 256);
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316 if (table->src2dst == NULL) {
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317 return NGX_CONF_ERROR;
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318 }
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319
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320 table->dst2src = ngx_palloc(cf->pool, 256);
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321 if (table->dst2src == NULL) {
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322 return NGX_CONF_ERROR;
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323 }
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324
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325 for (i = 0; i < 128; i++) {
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326 table->src2dst[i] = (char) i;
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327 table->dst2src[i] = (char) i;
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328 }
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329
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330 for (/* void */; i < 256; i++) {
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331 table->src2dst[i] = '?';
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332 table->dst2src[i] = '?';
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333 }
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334
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335 pvcf = *cf;
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336 cf->ctx = table;
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337 cf->handler = ngx_charset_map;
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338 cf->handler_conf = conf;
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339
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340 rv = ngx_conf_parse(cf, NULL);
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341
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342 *cf = pvcf;
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343
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344 return rv;
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345 }
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346
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347
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348 static char *
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349 ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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350 {
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351 ngx_int_t src, dst;
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352 ngx_str_t *value;
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353 ngx_http_charset_tables_t *table;
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354
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355 if (cf->args->nelts != 2) {
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356 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number");
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357 return NGX_CONF_ERROR;
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358 }
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359
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360 value = cf->args->elts;
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361
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362 src = ngx_hextoi(value[0].data, value[0].len);
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363 if (src == NGX_ERROR || src > 255) {
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364 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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365 "invalid value \"%V\"", &value[0]);
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366 return NGX_CONF_ERROR;
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367 }
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368
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369 dst = ngx_hextoi(value[1].data, value[1].len);
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370 if (dst == NGX_ERROR || dst > 255) {
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371 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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372 "invalid value \"%V\"", &value[1]);
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373 return NGX_CONF_ERROR;
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374 }
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375
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376 table = cf->ctx;
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377
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378 table->src2dst[src] = (char) dst;
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379 table->dst2src[dst] = (char) src;
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380
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381 return NGX_CONF_OK;
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382 }
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383
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384
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385 static char *
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386 ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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387 {
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388 char *p = conf;
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389
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390 ngx_int_t *cp;
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391 ngx_str_t *value;
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392 ngx_http_charset_main_conf_t *mcf;
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393
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394 cp = (ngx_int_t *) (p + cmd->offset);
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395
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396 if (*cp != NGX_CONF_UNSET) {
|
|
|
397 return "is duplicate";
|
|
|
398 }
|
|
|
399
|
|
78
|
400 value = cf->args->elts;
|
|
|
401
|
|
|
402 if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, charset)
|
|
|
403 && ngx_strcmp(value[1].data, "off") == 0)
|
|
|
404 {
|
|
|
405 *cp = NGX_HTTP_NO_CHARSET;
|
|
|
406 return NGX_CONF_OK;
|
|
|
407 }
|
|
|
408
|
|
50
|
409 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
410 ngx_http_charset_filter_module);
|
|
|
411
|
|
|
412 *cp = ngx_http_add_charset(&mcf->charsets, &value[1]);
|
|
|
413 if (*cp == NGX_ERROR) {
|
|
|
414 return NGX_CONF_ERROR;
|
|
|
415 }
|
|
|
416
|
|
|
417 return NGX_CONF_OK;
|
|
|
418 }
|
|
|
419
|
|
|
420
|
|
|
421 static ngx_int_t
|
|
|
422 ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name)
|
|
|
423 {
|
|
|
424 ngx_uint_t i;
|
|
|
425 ngx_http_charset_t *c;
|
|
|
426
|
|
|
427 c = charsets->elts;
|
|
|
428 for (i = 0; i < charsets->nelts; i++) {
|
|
|
429 if (name->len != c[i].name.len) {
|
|
|
430 continue;
|
|
|
431 }
|
|
|
432
|
|
|
433 if (ngx_strcasecmp(name->data, c[i].name.data) == 0) {
|
|
|
434 break;
|
|
|
435 }
|
|
|
436 }
|
|
|
437
|
|
|
438 if (i < charsets->nelts) {
|
|
|
439 return i;
|
|
|
440 }
|
|
|
441
|
|
|
442 c = ngx_array_push(charsets);
|
|
|
443 if (c == NULL) {
|
|
|
444 return NGX_ERROR;
|
|
|
445 }
|
|
|
446
|
|
|
447 c->tables = NULL;
|
|
|
448 c->name = *name;
|
|
|
449
|
|
72
|
450 if (ngx_strcasecmp(name->data, "utf-8") == 0) {
|
|
|
451 c->utf8 = 1;
|
|
|
452 }
|
|
|
453
|
|
50
|
454 return i;
|
|
|
455 }
|
|
|
456
|
|
|
457
|
|
|
458 static ngx_int_t
|
|
|
459 ngx_http_charset_filter_init(ngx_cycle_t *cycle)
|
|
|
460 {
|
|
|
461 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
462 ngx_http_top_header_filter = ngx_http_charset_header_filter;
|
|
|
463
|
|
|
464 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
465 ngx_http_top_body_filter = ngx_http_charset_body_filter;
|
|
|
466
|
|
|
467 return NGX_OK;
|
|
|
468 }
|
|
|
469
|
|
|
470
|
|
|
471 static void *
|
|
|
472 ngx_http_charset_create_main_conf(ngx_conf_t *cf)
|
|
|
473 {
|
|
|
474 ngx_http_charset_main_conf_t *mcf;
|
|
|
475
|
|
|
476 mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t));
|
|
|
477 if (mcf == NULL) {
|
|
|
478 return NGX_CONF_ERROR;
|
|
|
479 }
|
|
|
480
|
|
|
481 if (ngx_array_init(&mcf->charsets, cf->pool, 2, sizeof(ngx_http_charset_t))
|
|
78
|
482 == NGX_ERROR)
|
|
50
|
483 {
|
|
|
484 return NGX_CONF_ERROR;
|
|
|
485 }
|
|
|
486
|
|
78
|
487 if (ngx_array_init(&mcf->tables, cf->pool, 1,
|
|
50
|
488 sizeof(ngx_http_charset_tables_t)) == NGX_ERROR)
|
|
|
489 {
|
|
|
490 return NGX_CONF_ERROR;
|
|
|
491 }
|
|
|
492
|
|
78
|
493 if (ngx_array_init(&mcf->recodes, cf->pool, 2,
|
|
|
494 sizeof(ngx_http_charset_recode_t)) == NGX_ERROR)
|
|
|
495 {
|
|
|
496 return NGX_CONF_ERROR;
|
|
|
497 }
|
|
|
498
|
|
50
|
499 return mcf;
|
|
|
500 }
|
|
|
501
|
|
|
502
|
|
|
503 static void *
|
|
|
504 ngx_http_charset_create_loc_conf(ngx_conf_t *cf)
|
|
|
505 {
|
|
|
506 ngx_http_charset_loc_conf_t *lcf;
|
|
|
507
|
|
|
508 lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t));
|
|
|
509 if (lcf == NULL) {
|
|
|
510 return NGX_CONF_ERROR;
|
|
|
511 }
|
|
|
512
|
|
78
|
513 lcf->charset = NGX_CONF_UNSET;
|
|
50
|
514 lcf->source_charset = NGX_CONF_UNSET;
|
|
|
515
|
|
|
516 return lcf;
|
|
|
517 }
|
|
|
518
|
|
|
519
|
|
|
520 static char *
|
|
|
521 ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
522 {
|
|
|
523 ngx_http_charset_loc_conf_t *prev = parent;
|
|
|
524 ngx_http_charset_loc_conf_t *conf = child;
|
|
|
525
|
|
78
|
526 ngx_uint_t i;
|
|
|
527 ngx_http_charset_recode_t *recode;
|
|
|
528 ngx_http_charset_main_conf_t *mcf;
|
|
50
|
529
|
|
78
|
530 ngx_conf_merge_value(conf->charset, prev->charset, NGX_HTTP_NO_CHARSET);
|
|
50
|
531
|
|
|
532 if (conf->source_charset == NGX_CONF_UNSET) {
|
|
|
533 conf->source_charset = prev->source_charset;
|
|
|
534 }
|
|
|
535
|
|
78
|
536 if (conf->charset == NGX_HTTP_NO_CHARSET
|
|
|
537 || conf->source_charset == NGX_CONF_UNSET
|
|
|
538 || conf->charset == conf->source_charset)
|
|
50
|
539 {
|
|
78
|
540 return NGX_CONF_OK;
|
|
50
|
541 }
|
|
|
542
|
|
78
|
543 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
544 ngx_http_charset_filter_module);
|
|
|
545 recode = mcf->recodes.elts;
|
|
|
546 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
547 if (conf->source_charset == recode[i].src
|
|
|
548 && conf->charset == recode[i].dst)
|
|
|
549 {
|
|
|
550 return NGX_CONF_OK;
|
|
|
551 }
|
|
50
|
552 }
|
|
|
553
|
|
78
|
554 recode = ngx_array_push(&mcf->recodes);
|
|
|
555 if (recode == NULL) {
|
|
50
|
556 return NGX_CONF_ERROR;
|
|
|
557 }
|
|
|
558
|
|
78
|
559 recode->src = conf->source_charset;
|
|
|
560 recode->dst = conf->charset;
|
|
|
561
|
|
50
|
562 return NGX_CONF_OK;
|
|
|
563 }
|
|
78
|
564
|
|
|
565
|
|
|
566 static ngx_int_t
|
|
|
567 ngx_http_charset_postconfiguration(ngx_conf_t *cf)
|
|
|
568 {
|
|
|
569 ngx_int_t c;
|
|
|
570 ngx_uint_t i, t;
|
|
|
571 ngx_http_charset_t *charset;
|
|
|
572 ngx_http_charset_recode_t *recode;
|
|
|
573 ngx_http_charset_tables_t *tables;
|
|
|
574 ngx_http_charset_main_conf_t *mcf;
|
|
|
575
|
|
|
576 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
577 ngx_http_charset_filter_module);
|
|
|
578
|
|
|
579 recode = mcf->recodes.elts;
|
|
|
580 tables = mcf->tables.elts;
|
|
|
581 charset = mcf->charsets.elts;
|
|
|
582
|
|
|
583 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
584
|
|
|
585 c = recode[i].src;
|
|
|
586
|
|
|
587 charset[c].tables = ngx_pcalloc(cf->pool,
|
|
|
588 sizeof(char *) * mcf->charsets.nelts);
|
|
|
589 if (charset[c].tables == NULL) {
|
|
|
590 return NGX_ERROR;
|
|
|
591 }
|
|
|
592
|
|
|
593 for (t = 0; t < mcf->tables.nelts; t++) {
|
|
|
594
|
|
|
595 if (c == tables[t].src && recode[i].dst == tables[t].dst) {
|
|
|
596 charset[c].tables[tables[t].dst] = tables[t].src2dst;
|
|
|
597 goto next;
|
|
|
598 }
|
|
|
599
|
|
|
600 if (c == tables[t].dst && recode[i].dst == tables[t].src) {
|
|
|
601 charset[c].tables[tables[t].src] = tables[t].dst2src;
|
|
|
602 goto next;
|
|
|
603 }
|
|
|
604 }
|
|
|
605
|
|
|
606 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
|
|
|
607 " no \"charset_map\" between the charsets "
|
|
|
608 "\"%V\" and \"%V\"",
|
|
|
609 &charset[c].name, &charset[recode[i].dst].name);
|
|
|
610 return NGX_ERROR;
|
|
|
611
|
|
|
612 next:
|
|
|
613 continue;
|
|
|
614 }
|
|
|
615
|
|
|
616 return NGX_OK;
|
|
|
617 }
|
