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