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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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104
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165 if (r->main == r
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166 && ngx_strstr(r->headers_out.content_type.data, "charset") != NULL)
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50
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167 {
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168 return ngx_http_next_header_filter(r);
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169 }
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170
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171 if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY
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172 || r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY)
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173 {
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174 /*
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175 * do not set charset for the redirect because NN 4.x uses this
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176 * charset instead of the next page charset
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177 */
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178
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179 r->headers_out.charset.len = 0;
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180 return ngx_http_next_header_filter(r);
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181 }
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182
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183 if (r->headers_out.charset.len) {
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184 return ngx_http_next_header_filter(r);
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185 }
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186
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187 charsets = mcf->charsets.elts;
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78
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188 r->headers_out.charset = charsets[lcf->charset].name;
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189 r->utf8 = charsets[lcf->charset].utf8;
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190
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78
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191 if (lcf->source_charset == NGX_CONF_UNSET
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192 || lcf->source_charset == lcf->charset)
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193 {
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194 return ngx_http_next_header_filter(r);
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195 }
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196
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197
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198 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_charset_ctx_t));
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199 if (ctx == NULL) {
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200 return NGX_ERROR;
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201 }
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202
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203 ngx_http_set_ctx(r, ctx, ngx_http_charset_filter_module);
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204
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205
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206 r->filter_need_in_memory = 1;
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207
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208 return ngx_http_next_header_filter(r);
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209 }
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210
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211
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212 static ngx_int_t
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213 ngx_http_charset_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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214 {
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215 char *table;
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216 ngx_chain_t *cl;
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217 ngx_http_charset_t *charsets;
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218 ngx_http_charset_ctx_t *ctx;
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219 ngx_http_charset_loc_conf_t *lcf;
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220 ngx_http_charset_main_conf_t *mcf;
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221
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222 ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module);
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223
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224 if (ctx == NULL) {
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225 return ngx_http_next_body_filter(r, in);
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226 }
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227
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228 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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229 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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230
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231 charsets = mcf->charsets.elts;
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232 table = charsets[lcf->source_charset].tables[lcf->charset];
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233
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234 for (cl = in; cl; cl = cl->next) {
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78
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235 ngx_http_charset_recode(cl->buf, table);
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50
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236 }
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237
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238 return ngx_http_next_body_filter(r, in);
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239 }
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240
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241
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242 static ngx_uint_t
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78
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243 ngx_http_charset_recode(ngx_buf_t *b, char *table)
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244 {
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245 u_char *p;
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246 ngx_uint_t change;
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247
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248 change = 0;
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249
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250 for (p = b->pos; p < b->last; p++) {
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251 if (*p != table[*p]) {
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252 change = 1;
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253 break;
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254 }
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255 }
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256
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257 if (change) {
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258
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259 while (p < b->last) {
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260 *p = table[*p];
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261 p++;
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262 }
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263
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264 b->in_file = 0;
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265 }
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266
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267 return change;
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268 }
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269
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270
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271 static char *
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272 ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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273 {
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274 ngx_http_charset_main_conf_t *mcf = conf;
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275
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276 char *rv;
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277 ngx_int_t src, dst;
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278 ngx_uint_t i;
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279 ngx_str_t *value;
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280 ngx_conf_t pvcf;
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281 ngx_http_charset_tables_t *table;
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282
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283 value = cf->args->elts;
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284
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285 src = ngx_http_add_charset(&mcf->charsets, &value[1]);
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286 if (src == NGX_ERROR) {
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287 return NGX_CONF_ERROR;
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288 }
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289
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290 dst = ngx_http_add_charset(&mcf->charsets, &value[2]);
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291 if (dst == NGX_ERROR) {
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292 return NGX_CONF_ERROR;
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293 }
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294
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295 if (src == dst) {
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296 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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297 "\"charset_map\" between the same charsets "
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298 "\"%V\" and \"%V\"", &value[1], &value[2]);
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299 return NGX_CONF_ERROR;
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300 }
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301
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302 table = mcf->tables.elts;
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303 for (i = 0; i < mcf->tables.nelts; i++) {
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304 if ((src == table->src && dst == table->dst)
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305 || (src == table->dst && dst == table->src))
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306 {
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307 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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308 "duplicate \"charset_map\" between "
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309 "\"%V\" and \"%V\"", &value[1], &value[2]);
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310 return NGX_CONF_ERROR;
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311 }
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312 }
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313
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314 table = ngx_array_push(&mcf->tables);
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315 if (table == NULL) {
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316 return NGX_CONF_ERROR;
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317 }
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318
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319 table->src = src;
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320 table->dst = dst;
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321
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322 table->src2dst = ngx_palloc(cf->pool, 256);
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323 if (table->src2dst == NULL) {
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324 return NGX_CONF_ERROR;
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325 }
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326
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327 table->dst2src = ngx_palloc(cf->pool, 256);
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328 if (table->dst2src == NULL) {
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329 return NGX_CONF_ERROR;
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330 }
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331
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332 for (i = 0; i < 128; i++) {
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333 table->src2dst[i] = (char) i;
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334 table->dst2src[i] = (char) i;
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335 }
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336
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337 for (/* void */; i < 256; i++) {
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338 table->src2dst[i] = '?';
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339 table->dst2src[i] = '?';
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340 }
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341
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342 pvcf = *cf;
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343 cf->ctx = table;
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344 cf->handler = ngx_charset_map;
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345 cf->handler_conf = conf;
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346
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347 rv = ngx_conf_parse(cf, NULL);
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348
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349 *cf = pvcf;
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350
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351 return rv;
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352 }
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353
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354
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355 static char *
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356 ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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357 {
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358 ngx_int_t src, dst;
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359 ngx_str_t *value;
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360 ngx_http_charset_tables_t *table;
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361
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362 if (cf->args->nelts != 2) {
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363 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number");
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364 return NGX_CONF_ERROR;
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365 }
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366
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367 value = cf->args->elts;
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368
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369 src = ngx_hextoi(value[0].data, value[0].len);
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370 if (src == NGX_ERROR || src > 255) {
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371 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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372 "invalid value \"%V\"", &value[0]);
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373 return NGX_CONF_ERROR;
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374 }
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375
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376 dst = ngx_hextoi(value[1].data, value[1].len);
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377 if (dst == NGX_ERROR || dst > 255) {
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378 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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379 "invalid value \"%V\"", &value[1]);
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380 return NGX_CONF_ERROR;
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381 }
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382
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383 table = cf->ctx;
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384
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385 table->src2dst[src] = (char) dst;
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386 table->dst2src[dst] = (char) src;
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387
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388 return NGX_CONF_OK;
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389 }
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390
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391
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392 static char *
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393 ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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394 {
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395 char *p = conf;
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|
|
396
|
|
|
397 ngx_int_t *cp;
|
|
|
398 ngx_str_t *value;
|
|
|
399 ngx_http_charset_main_conf_t *mcf;
|
|
|
400
|
|
|
401 cp = (ngx_int_t *) (p + cmd->offset);
|
|
|
402
|
|
|
403 if (*cp != NGX_CONF_UNSET) {
|
|
|
404 return "is duplicate";
|
|
|
405 }
|
|
|
406
|
|
78
|
407 value = cf->args->elts;
|
|
|
408
|
|
|
409 if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, charset)
|
|
|
410 && ngx_strcmp(value[1].data, "off") == 0)
|
|
|
411 {
|
|
|
412 *cp = NGX_HTTP_NO_CHARSET;
|
|
|
413 return NGX_CONF_OK;
|
|
|
414 }
|
|
|
415
|
|
50
|
416 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
417 ngx_http_charset_filter_module);
|
|
|
418
|
|
|
419 *cp = ngx_http_add_charset(&mcf->charsets, &value[1]);
|
|
|
420 if (*cp == NGX_ERROR) {
|
|
|
421 return NGX_CONF_ERROR;
|
|
|
422 }
|
|
|
423
|
|
|
424 return NGX_CONF_OK;
|
|
|
425 }
|
|
|
426
|
|
|
427
|
|
|
428 static ngx_int_t
|
|
|
429 ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name)
|
|
|
430 {
|
|
|
431 ngx_uint_t i;
|
|
|
432 ngx_http_charset_t *c;
|
|
|
433
|
|
|
434 c = charsets->elts;
|
|
|
435 for (i = 0; i < charsets->nelts; i++) {
|
|
|
436 if (name->len != c[i].name.len) {
|
|
|
437 continue;
|
|
|
438 }
|
|
|
439
|
|
|
440 if (ngx_strcasecmp(name->data, c[i].name.data) == 0) {
|
|
|
441 break;
|
|
|
442 }
|
|
|
443 }
|
|
|
444
|
|
|
445 if (i < charsets->nelts) {
|
|
|
446 return i;
|
|
|
447 }
|
|
|
448
|
|
|
449 c = ngx_array_push(charsets);
|
|
|
450 if (c == NULL) {
|
|
|
451 return NGX_ERROR;
|
|
|
452 }
|
|
|
453
|
|
|
454 c->tables = NULL;
|
|
|
455 c->name = *name;
|
|
|
456
|
|
72
|
457 if (ngx_strcasecmp(name->data, "utf-8") == 0) {
|
|
|
458 c->utf8 = 1;
|
|
|
459 }
|
|
|
460
|
|
50
|
461 return i;
|
|
|
462 }
|
|
|
463
|
|
|
464
|
|
|
465 static ngx_int_t
|
|
|
466 ngx_http_charset_filter_init(ngx_cycle_t *cycle)
|
|
|
467 {
|
|
|
468 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
469 ngx_http_top_header_filter = ngx_http_charset_header_filter;
|
|
|
470
|
|
|
471 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
472 ngx_http_top_body_filter = ngx_http_charset_body_filter;
|
|
|
473
|
|
|
474 return NGX_OK;
|
|
|
475 }
|
|
|
476
|
|
|
477
|
|
|
478 static void *
|
|
|
479 ngx_http_charset_create_main_conf(ngx_conf_t *cf)
|
|
|
480 {
|
|
|
481 ngx_http_charset_main_conf_t *mcf;
|
|
|
482
|
|
|
483 mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t));
|
|
|
484 if (mcf == NULL) {
|
|
|
485 return NGX_CONF_ERROR;
|
|
|
486 }
|
|
|
487
|
|
|
488 if (ngx_array_init(&mcf->charsets, cf->pool, 2, sizeof(ngx_http_charset_t))
|
|
78
|
489 == NGX_ERROR)
|
|
50
|
490 {
|
|
|
491 return NGX_CONF_ERROR;
|
|
|
492 }
|
|
|
493
|
|
78
|
494 if (ngx_array_init(&mcf->tables, cf->pool, 1,
|
|
50
|
495 sizeof(ngx_http_charset_tables_t)) == NGX_ERROR)
|
|
|
496 {
|
|
|
497 return NGX_CONF_ERROR;
|
|
|
498 }
|
|
|
499
|
|
78
|
500 if (ngx_array_init(&mcf->recodes, cf->pool, 2,
|
|
|
501 sizeof(ngx_http_charset_recode_t)) == NGX_ERROR)
|
|
|
502 {
|
|
|
503 return NGX_CONF_ERROR;
|
|
|
504 }
|
|
|
505
|
|
50
|
506 return mcf;
|
|
|
507 }
|
|
|
508
|
|
|
509
|
|
|
510 static void *
|
|
|
511 ngx_http_charset_create_loc_conf(ngx_conf_t *cf)
|
|
|
512 {
|
|
|
513 ngx_http_charset_loc_conf_t *lcf;
|
|
|
514
|
|
|
515 lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t));
|
|
|
516 if (lcf == NULL) {
|
|
|
517 return NGX_CONF_ERROR;
|
|
|
518 }
|
|
|
519
|
|
78
|
520 lcf->charset = NGX_CONF_UNSET;
|
|
50
|
521 lcf->source_charset = NGX_CONF_UNSET;
|
|
|
522
|
|
|
523 return lcf;
|
|
|
524 }
|
|
|
525
|
|
|
526
|
|
|
527 static char *
|
|
|
528 ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
529 {
|
|
|
530 ngx_http_charset_loc_conf_t *prev = parent;
|
|
|
531 ngx_http_charset_loc_conf_t *conf = child;
|
|
|
532
|
|
78
|
533 ngx_uint_t i;
|
|
|
534 ngx_http_charset_recode_t *recode;
|
|
|
535 ngx_http_charset_main_conf_t *mcf;
|
|
50
|
536
|
|
78
|
537 ngx_conf_merge_value(conf->charset, prev->charset, NGX_HTTP_NO_CHARSET);
|
|
50
|
538
|
|
|
539 if (conf->source_charset == NGX_CONF_UNSET) {
|
|
|
540 conf->source_charset = prev->source_charset;
|
|
|
541 }
|
|
|
542
|
|
78
|
543 if (conf->charset == NGX_HTTP_NO_CHARSET
|
|
|
544 || conf->source_charset == NGX_CONF_UNSET
|
|
|
545 || conf->charset == conf->source_charset)
|
|
50
|
546 {
|
|
78
|
547 return NGX_CONF_OK;
|
|
50
|
548 }
|
|
|
549
|
|
78
|
550 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
551 ngx_http_charset_filter_module);
|
|
|
552 recode = mcf->recodes.elts;
|
|
|
553 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
554 if (conf->source_charset == recode[i].src
|
|
|
555 && conf->charset == recode[i].dst)
|
|
|
556 {
|
|
|
557 return NGX_CONF_OK;
|
|
|
558 }
|
|
50
|
559 }
|
|
|
560
|
|
78
|
561 recode = ngx_array_push(&mcf->recodes);
|
|
|
562 if (recode == NULL) {
|
|
50
|
563 return NGX_CONF_ERROR;
|
|
|
564 }
|
|
|
565
|
|
78
|
566 recode->src = conf->source_charset;
|
|
|
567 recode->dst = conf->charset;
|
|
|
568
|
|
50
|
569 return NGX_CONF_OK;
|
|
|
570 }
|
|
78
|
571
|
|
|
572
|
|
|
573 static ngx_int_t
|
|
|
574 ngx_http_charset_postconfiguration(ngx_conf_t *cf)
|
|
|
575 {
|
|
|
576 ngx_int_t c;
|
|
|
577 ngx_uint_t i, t;
|
|
|
578 ngx_http_charset_t *charset;
|
|
|
579 ngx_http_charset_recode_t *recode;
|
|
|
580 ngx_http_charset_tables_t *tables;
|
|
|
581 ngx_http_charset_main_conf_t *mcf;
|
|
|
582
|
|
|
583 mcf = ngx_http_conf_get_module_main_conf(cf,
|
|
|
584 ngx_http_charset_filter_module);
|
|
|
585
|
|
|
586 recode = mcf->recodes.elts;
|
|
|
587 tables = mcf->tables.elts;
|
|
|
588 charset = mcf->charsets.elts;
|
|
|
589
|
|
|
590 for (i = 0; i < mcf->recodes.nelts; i++) {
|
|
|
591
|
|
|
592 c = recode[i].src;
|
|
|
593
|
|
|
594 charset[c].tables = ngx_pcalloc(cf->pool,
|
|
|
595 sizeof(char *) * mcf->charsets.nelts);
|
|
|
596 if (charset[c].tables == NULL) {
|
|
|
597 return NGX_ERROR;
|
|
|
598 }
|
|
|
599
|
|
|
600 for (t = 0; t < mcf->tables.nelts; t++) {
|
|
|
601
|
|
|
602 if (c == tables[t].src && recode[i].dst == tables[t].dst) {
|
|
|
603 charset[c].tables[tables[t].dst] = tables[t].src2dst;
|
|
|
604 goto next;
|
|
|
605 }
|
|
|
606
|
|
|
607 if (c == tables[t].dst && recode[i].dst == tables[t].src) {
|
|
|
608 charset[c].tables[tables[t].src] = tables[t].dst2src;
|
|
|
609 goto next;
|
|
|
610 }
|
|
|
611 }
|
|
|
612
|
|
|
613 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
|
|
|
614 " no \"charset_map\" between the charsets "
|
|
|
615 "\"%V\" and \"%V\"",
|
|
|
616 &charset[c].name, &charset[recode[i].dst].name);
|
|
|
617 return NGX_ERROR;
|
|
|
618
|
|
|
619 next:
|
|
|
620 continue;
|
|
|
621 }
|
|
|
622
|
|
|
623 return NGX_OK;
|
|
|
624 }
|
