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