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