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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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90
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124 NULL, /* init master */
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125 ngx_http_charset_filter_init, /* init module */
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90
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126 NULL, /* init process */
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127 NULL, /* init thread */
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128 NULL, /* exit thread */
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129 NULL, /* exit process */
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130 NULL, /* exit master */
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131 NGX_MODULE_V1_PADDING
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50
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132 };
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133
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134
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135 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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136 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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137
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138
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139 static ngx_int_t
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140 ngx_http_charset_header_filter(ngx_http_request_t *r)
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141 {
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142 ngx_http_charset_t *charsets;
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143 ngx_http_charset_ctx_t *ctx;
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144 ngx_http_charset_loc_conf_t *lcf;
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145 ngx_http_charset_main_conf_t *mcf;
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146
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147 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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148 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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149
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78
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150 if (lcf->charset == NGX_HTTP_NO_CHARSET) {
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151 return ngx_http_next_header_filter(r);
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152 }
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153
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58
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154 if (r->headers_out.content_type.len == 0) {
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155 return ngx_http_next_header_filter(r);
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156 }
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157
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58
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158 if (ngx_strncasecmp(r->headers_out.content_type.data, "text/", 5) != 0
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159 && ngx_strncasecmp(r->headers_out.content_type.data,
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160 "application/x-javascript", 24) != 0)
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50
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161 {
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162 return ngx_http_next_header_filter(r);
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163 }
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164
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58
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165 if (ngx_strstr(r->headers_out.content_type.data, "charset") != NULL)
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166 {
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167 return ngx_http_next_header_filter(r);
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168 }
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169
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170 if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY
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171 || r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY)
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172 {
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173 /*
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174 * do not set charset for the redirect because NN 4.x uses this
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175 * charset instead of the next page charset
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176 */
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177
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178 r->headers_out.charset.len = 0;
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179 return ngx_http_next_header_filter(r);
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180 }
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181
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182 if (r->headers_out.charset.len) {
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183 return ngx_http_next_header_filter(r);
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184 }
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185
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186 charsets = mcf->charsets.elts;
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78
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187 r->headers_out.charset = charsets[lcf->charset].name;
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188 r->utf8 = charsets[lcf->charset].utf8;
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189
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78
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190 if (lcf->source_charset == NGX_CONF_UNSET
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191 || lcf->source_charset == lcf->charset)
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192 {
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193 return ngx_http_next_header_filter(r);
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194 }
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195
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196
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197 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_charset_ctx_t));
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198 if (ctx == NULL) {
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199 return NGX_ERROR;
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200 }
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201
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202 ngx_http_set_ctx(r, ctx, ngx_http_charset_filter_module);
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203
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204
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205 r->filter_need_in_memory = 1;
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206
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207 return ngx_http_next_header_filter(r);
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208 }
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209
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210
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211 static ngx_int_t
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212 ngx_http_charset_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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213 {
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214 char *table;
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215 ngx_chain_t *cl;
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216 ngx_http_charset_t *charsets;
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217 ngx_http_charset_ctx_t *ctx;
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218 ngx_http_charset_loc_conf_t *lcf;
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219 ngx_http_charset_main_conf_t *mcf;
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220
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221 ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module);
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222
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223 if (ctx == NULL) {
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224 return ngx_http_next_body_filter(r, in);
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225 }
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226
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227 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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228 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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229
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230 charsets = mcf->charsets.elts;
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231 table = charsets[lcf->source_charset].tables[lcf->charset];
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232
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233 for (cl = in; cl; cl = cl->next) {
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234 ngx_http_charset_recode(cl->buf, table);
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50
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235 }
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236
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237 return ngx_http_next_body_filter(r, in);
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238 }
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239
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240
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241 static ngx_uint_t
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78
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242 ngx_http_charset_recode(ngx_buf_t *b, char *table)
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50
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243 {
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244 u_char *p;
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245 ngx_uint_t change;
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246
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247 change = 0;
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248
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249 for (p = b->pos; p < b->last; p++) {
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250 if (*p != table[*p]) {
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251 change = 1;
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252 break;
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253 }
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254 }
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255
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256 if (change) {
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257
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258 while (p < b->last) {
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259 *p = table[*p];
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260 p++;
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261 }
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262
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263 b->in_file = 0;
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264 }
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265
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266 return change;
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267 }
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268
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269
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270 static char *
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271 ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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272 {
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273 ngx_http_charset_main_conf_t *mcf = conf;
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274
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275 char *rv;
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276 ngx_int_t src, dst;
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277 ngx_uint_t i;
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278 ngx_str_t *value;
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279 ngx_conf_t pvcf;
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280 ngx_http_charset_tables_t *table;
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281
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282 value = cf->args->elts;
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283
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284 src = ngx_http_add_charset(&mcf->charsets, &value[1]);
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285 if (src == NGX_ERROR) {
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286 return NGX_CONF_ERROR;
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287 }
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288
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289 dst = ngx_http_add_charset(&mcf->charsets, &value[2]);
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290 if (dst == NGX_ERROR) {
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291 return NGX_CONF_ERROR;
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292 }
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293
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294 if (src == dst) {
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295 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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296 "\"charset_map\" between the same charsets "
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297 "\"%V\" and \"%V\"", &value[1], &value[2]);
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298 return NGX_CONF_ERROR;
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299 }
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300
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301 table = mcf->tables.elts;
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302 for (i = 0; i < mcf->tables.nelts; i++) {
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303 if ((src == table->src && dst == table->dst)
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304 || (src == table->dst && dst == table->src))
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305 {
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306 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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307 "duplicate \"charset_map\" between "
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308 "\"%V\" and \"%V\"", &value[1], &value[2]);
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309 return NGX_CONF_ERROR;
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310 }
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311 }
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312
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313 table = ngx_array_push(&mcf->tables);
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314 if (table == NULL) {
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315 return NGX_CONF_ERROR;
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316 }
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317
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318 table->src = src;
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319 table->dst = dst;
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320
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321 table->src2dst = ngx_palloc(cf->pool, 256);
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322 if (table->src2dst == NULL) {
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323 return NGX_CONF_ERROR;
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324 }
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325
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326 table->dst2src = ngx_palloc(cf->pool, 256);
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327 if (table->dst2src == NULL) {
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328 return NGX_CONF_ERROR;
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329 }
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330
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331 for (i = 0; i < 128; i++) {
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332 table->src2dst[i] = (char) i;
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333 table->dst2src[i] = (char) i;
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334 }
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335
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336 for (/* void */; i < 256; i++) {
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337 table->src2dst[i] = '?';
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338 table->dst2src[i] = '?';
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339 }
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340
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341 pvcf = *cf;
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342 cf->ctx = table;
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343 cf->handler = ngx_charset_map;
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344 cf->handler_conf = conf;
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345
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346 rv = ngx_conf_parse(cf, NULL);
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347
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348 *cf = pvcf;
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349
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350 return rv;
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351 }
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352
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353
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354 static char *
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355 ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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356 {
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357 ngx_int_t src, dst;
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358 ngx_str_t *value;
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359 ngx_http_charset_tables_t *table;
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360
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361 if (cf->args->nelts != 2) {
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362 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number");
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363 return NGX_CONF_ERROR;
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364 }
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365
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366 value = cf->args->elts;
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367
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368 src = ngx_hextoi(value[0].data, value[0].len);
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369 if (src == NGX_ERROR || src > 255) {
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370 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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371 "invalid value \"%V\"", &value[0]);
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372 return NGX_CONF_ERROR;
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373 }
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374
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375 dst = ngx_hextoi(value[1].data, value[1].len);
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376 if (dst == NGX_ERROR || dst > 255) {
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377 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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378 "invalid value \"%V\"", &value[1]);
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379 return NGX_CONF_ERROR;
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380 }
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381
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382 table = cf->ctx;
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383
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384 table->src2dst[src] = (char) dst;
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385 table->dst2src[dst] = (char) src;
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386
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387 return NGX_CONF_OK;
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388 }
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389
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390
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391 static char *
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392 ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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393 {
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394 char *p = conf;
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395
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396 ngx_int_t *cp;
|
|
|
397 ngx_str_t *value;
|
|
|
398 ngx_http_charset_main_conf_t *mcf;
|
|
|
399
|
|
|
400 cp = (ngx_int_t *) (p + cmd->offset);
|
|
|
401
|
|
|
402 if (*cp != NGX_CONF_UNSET) {
|
|
|
403 return "is duplicate";
|
|
|
404 }
|
|
|
405
|
|
78
|
406 value = cf->args->elts;
|
|
|
407
|
|
|
408 if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, charset)
|
|
|
409 && ngx_strcmp(value[1].data, "off") == 0)
|
|
|
410 {
|
|
|
411 *cp = NGX_HTTP_NO_CHARSET;
|
|
|
412 return NGX_CONF_OK;
|
|
|
413 }
|
|
|
414
|
|
50
|
415 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
416 ngx_http_charset_filter_module);
|
|
|
417
|
|
|
418 *cp = ngx_http_add_charset(&mcf->charsets, &value[1]);
|
|
|
419 if (*cp == NGX_ERROR) {
|
|
|
420 return NGX_CONF_ERROR;
|
|
|
421 }
|
|
|
422
|
|
|
423 return NGX_CONF_OK;
|
|
|
424 }
|
|
|
425
|
|
|
426
|
|
|
427 static ngx_int_t
|
|
|
428 ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name)
|
|
|
429 {
|
|
|
430 ngx_uint_t i;
|
|
|
431 ngx_http_charset_t *c;
|
|
|
432
|
|
|
433 c = charsets->elts;
|
|
|
434 for (i = 0; i < charsets->nelts; i++) {
|
|
|
435 if (name->len != c[i].name.len) {
|
|
|
436 continue;
|
|
|
437 }
|
|
|
438
|
|
|
439 if (ngx_strcasecmp(name->data, c[i].name.data) == 0) {
|
|
|
440 break;
|
|
|
441 }
|
|
|
442 }
|
|
|
443
|
|
|
444 if (i < charsets->nelts) {
|
|
|
445 return i;
|
|
|
446 }
|
|
|
447
|
|
|
448 c = ngx_array_push(charsets);
|
|
|
449 if (c == NULL) {
|
|
|
450 return NGX_ERROR;
|
|
|
451 }
|
|
|
452
|
|
|
453 c->tables = NULL;
|
|
|
454 c->name = *name;
|
|
|
455
|
|
72
|
456 if (ngx_strcasecmp(name->data, "utf-8") == 0) {
|
|
|
457 c->utf8 = 1;
|
|
|
458 }
|
|
|
459
|
|
50
|
460 return i;
|
|
|
461 }
|
|
|
462
|
|
|
463
|
|
|
464 static ngx_int_t
|
|
|
465 ngx_http_charset_filter_init(ngx_cycle_t *cycle)
|
|
|
466 {
|
|
|
467 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
468 ngx_http_top_header_filter = ngx_http_charset_header_filter;
|
|
|
469
|
|
|
470 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
471 ngx_http_top_body_filter = ngx_http_charset_body_filter;
|
|
|
472
|
|
|
473 return NGX_OK;
|
|
|
474 }
|
|
|
475
|
|
|
476
|
|
|
477 static void *
|
|
|
478 ngx_http_charset_create_main_conf(ngx_conf_t *cf)
|
|
|
479 {
|
|
|
480 ngx_http_charset_main_conf_t *mcf;
|
|
|
481
|
|
|
482 mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t));
|
|
|
483 if (mcf == NULL) {
|
|
|
484 return NGX_CONF_ERROR;
|
|
|
485 }
|
|
|
486
|
|
|
487 if (ngx_array_init(&mcf->charsets, cf->pool, 2, sizeof(ngx_http_charset_t))
|
|
78
|
488 == NGX_ERROR)
|
|
50
|
489 {
|
|
|
490 return NGX_CONF_ERROR;
|
|
|
491 }
|
|
|
492
|
|
78
|
493 if (ngx_array_init(&mcf->tables, cf->pool, 1,
|
|
50
|
494 sizeof(ngx_http_charset_tables_t)) == NGX_ERROR)
|
|
|
495 {
|
|
|
496 return NGX_CONF_ERROR;
|
|
|
497 }
|
|
|
498
|
|
78
|
499 if (ngx_array_init(&mcf->recodes, cf->pool, 2,
|
|
|
500 sizeof(ngx_http_charset_recode_t)) == NGX_ERROR)
|
|
|
501 {
|
|
|
502 return NGX_CONF_ERROR;
|
|
|
503 }
|
|
|
504
|
|
50
|
505 return mcf;
|
|
|
506 }
|
|
|
507
|
|
|
508
|
|
|
509 static void *
|
|
|
510 ngx_http_charset_create_loc_conf(ngx_conf_t *cf)
|
|
|
511 {
|
|
|
512 ngx_http_charset_loc_conf_t *lcf;
|
|
|
513
|
|
|
514 lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t));
|
|
|
515 if (lcf == NULL) {
|
|
|
516 return NGX_CONF_ERROR;
|
|
|
517 }
|
|
|
518
|
|
78
|
519 lcf->charset = NGX_CONF_UNSET;
|
|
50
|
520 lcf->source_charset = NGX_CONF_UNSET;
|
|
|
521
|
|
|
522 return lcf;
|
|
|
523 }
|
|
|
524
|
|
|
525
|
|
|
526 static char *
|
|
|
527 ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
528 {
|
|
|
529 ngx_http_charset_loc_conf_t *prev = parent;
|
|
|
530 ngx_http_charset_loc_conf_t *conf = child;
|
|
|
531
|
|
78
|
532 ngx_uint_t i;
|
|
|
533 ngx_http_charset_recode_t *recode;
|
|
|
534 ngx_http_charset_main_conf_t *mcf;
|
|
50
|
535
|
|
78
|
536 ngx_conf_merge_value(conf->charset, prev->charset, NGX_HTTP_NO_CHARSET);
|
|
50
|
537
|
|
|
538 if (conf->source_charset == NGX_CONF_UNSET) {
|
|
|
539 conf->source_charset = prev->source_charset;
|
|
|
540 }
|
|
|
541
|
|
78
|
542 if (conf->charset == NGX_HTTP_NO_CHARSET
|
|
|
543 || conf->source_charset == NGX_CONF_UNSET
|
|
|
544 || conf->charset == conf->source_charset)
|
|
50
|
545 {
|
|
78
|
546 return NGX_CONF_OK;
|
|
50
|
547 }
|
|
|
548
|
|
78
|
549 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
550 ngx_http_charset_filter_module);
|
|
|
551 recode = mcf->recodes.elts;
|
|
|
552 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
553 if (conf->source_charset == recode[i].src
|
|
|
554 && conf->charset == recode[i].dst)
|
|
|
555 {
|
|
|
556 return NGX_CONF_OK;
|
|
|
557 }
|
|
50
|
558 }
|
|
|
559
|
|
78
|
560 recode = ngx_array_push(&mcf->recodes);
|
|
|
561 if (recode == NULL) {
|
|
50
|
562 return NGX_CONF_ERROR;
|
|
|
563 }
|
|
|
564
|
|
78
|
565 recode->src = conf->source_charset;
|
|
|
566 recode->dst = conf->charset;
|
|
|
567
|
|
50
|
568 return NGX_CONF_OK;
|
|
|
569 }
|
|
78
|
570
|
|
|
571
|
|
|
572 static ngx_int_t
|
|
|
573 ngx_http_charset_postconfiguration(ngx_conf_t *cf)
|
|
|
574 {
|
|
|
575 ngx_int_t c;
|
|
|
576 ngx_uint_t i, t;
|
|
|
577 ngx_http_charset_t *charset;
|
|
|
578 ngx_http_charset_recode_t *recode;
|
|
|
579 ngx_http_charset_tables_t *tables;
|
|
|
580 ngx_http_charset_main_conf_t *mcf;
|
|
|
581
|
|
|
582 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
583 ngx_http_charset_filter_module);
|
|
|
584
|
|
|
585 recode = mcf->recodes.elts;
|
|
|
586 tables = mcf->tables.elts;
|
|
|
587 charset = mcf->charsets.elts;
|
|
|
588
|
|
|
589 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
590
|
|
|
591 c = recode[i].src;
|
|
|
592
|
|
|
593 charset[c].tables = ngx_pcalloc(cf->pool,
|
|
|
594 sizeof(char *) * mcf->charsets.nelts);
|
|
|
595 if (charset[c].tables == NULL) {
|
|
|
596 return NGX_ERROR;
|
|
|
597 }
|
|
|
598
|
|
|
599 for (t = 0; t < mcf->tables.nelts; t++) {
|
|
|
600
|
|
|
601 if (c == tables[t].src && recode[i].dst == tables[t].dst) {
|
|
|
602 charset[c].tables[tables[t].dst] = tables[t].src2dst;
|
|
|
603 goto next;
|
|
|
604 }
|
|
|
605
|
|
|
606 if (c == tables[t].dst && recode[i].dst == tables[t].src) {
|
|
|
607 charset[c].tables[tables[t].src] = tables[t].dst2src;
|
|
|
608 goto next;
|
|
|
609 }
|
|
|
610 }
|
|
|
611
|
|
|
612 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
|
|
|
613 " no \"charset_map\" between the charsets "
|
|
|
614 "\"%V\" and \"%V\"",
|
|
|
615 &charset[c].name, &charset[recode[i].dst].name);
|
|
|
616 return NGX_ERROR;
|
|
|
617
|
|
|
618 next:
|
|
|
619 continue;
|
|
|
620 }
|
|
|
621
|
|
|
622 return NGX_OK;
|
|
|
623 }
|
