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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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15 unsigned server;
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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 void 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 child */
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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 0
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151 if (lcf->default_charset.len == 0) {
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152 return ngx_http_next_header_filter(r);
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153 }
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154 #endif
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155
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156 if (r->headers_out.content_type == NULL) {
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157 return ngx_http_next_header_filter(r);
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158 }
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159
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160 if (ngx_strncasecmp(r->headers_out.content_type->value.data,
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161 "text/", 5) != 0
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162 && ngx_strncasecmp(r->headers_out.content_type->value.data,
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163 "application/x-javascript", 24) != 0)
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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 (ngx_strstr(r->headers_out.content_type->value.data, "charset") != NULL)
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169 {
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170 return ngx_http_next_header_filter(r);
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171 }
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172
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173 if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY
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174 && r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY)
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175 {
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176 /*
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177 * do not set charset for the redirect because NN 4.x uses this
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178 * charset instead of the next page charset
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179 */
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180
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181 r->headers_out.charset.len = 0;
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182 return ngx_http_next_header_filter(r);
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183 }
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184
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185 if (r->headers_out.charset.len) {
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186 return ngx_http_next_header_filter(r);
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187 }
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188
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189 charsets = mcf->charsets.elts;
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190 r->headers_out.charset = charsets[lcf->default_charset].name;
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191
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192 if (lcf->default_charset == lcf->source_charset) {
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193 return ngx_http_next_header_filter(r);
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194 }
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195
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196 ngx_http_create_ctx(r, ctx, ngx_http_charset_filter_module,
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197 sizeof(ngx_http_charset_ctx_t), NGX_ERROR);
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198
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199 r->filter_need_in_memory = 1;
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200
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201 return ngx_http_next_header_filter(r);
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202 }
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203
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204
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205 static ngx_int_t ngx_http_charset_body_filter(ngx_http_request_t *r,
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206 ngx_chain_t *in)
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207 {
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208 char *table;
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209 ngx_chain_t *cl;
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210 ngx_http_charset_t *charsets;
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211 ngx_http_charset_ctx_t *ctx;
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212 ngx_http_charset_loc_conf_t *lcf;
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213 ngx_http_charset_main_conf_t *mcf;
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214
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215 ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module);
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216
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217 if (ctx == NULL) {
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218 return ngx_http_next_body_filter(r, in);
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219 }
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220
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221 mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module);
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222 lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module);
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223
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224 charsets = mcf->charsets.elts;
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225 table = charsets[lcf->source_charset].tables[lcf->default_charset];
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226
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227 for (cl = in; cl; cl = cl->next) {
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228 ngx_charset_recode(cl->buf, table);
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229 }
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230
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231 return ngx_http_next_body_filter(r, in);
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232 }
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233
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234
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235 static void ngx_charset_recode(ngx_buf_t *b, char *table)
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236 {
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237 u_char *p, c;
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238
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239 for (p = b->pos; p < b->last; p++) {
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240 c = *p;
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241 *p = table[c];
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242 }
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243 }
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244
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245
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246 static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd,
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247 void *conf)
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248 {
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249 ngx_http_charset_main_conf_t *mcf = conf;
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250
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251 char *rv;
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252 ngx_int_t src, dst;
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253 ngx_uint_t i;
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254 ngx_str_t *value;
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255 ngx_conf_t pvcf;
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256 ngx_http_charset_tables_t *table;
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257
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258 value = cf->args->elts;
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259
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260 src = ngx_http_add_charset(&mcf->charsets, &value[1]);
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261 if (src == NGX_ERROR) {
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262 return NGX_CONF_ERROR;
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263 }
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264
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265 dst = ngx_http_add_charset(&mcf->charsets, &value[2]);
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266 if (dst == NGX_ERROR) {
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267 return NGX_CONF_ERROR;
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268 }
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269
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270 if (src == dst) {
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271 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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272 "\"charset_map\" between the same charsets "
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273 "\"%s\" and \"%s\"",
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274 value[1].data, value[2].data);
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275 return NGX_CONF_ERROR;
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276 }
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277
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278 table = mcf->tables.elts;
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279 for (i = 0; i < mcf->tables.nelts; i++) {
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280 if ((src == table->src && dst == table->dst)
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281 || (src == table->dst && dst == table->src))
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282 {
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283 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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284 "duplicate \"charset_map\" between "
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285 "\"%s\" and \"%s\"",
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286 value[1].data, value[2].data);
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287 return NGX_CONF_ERROR;
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288 }
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289 }
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290
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291 if (!(table = ngx_push_array(&mcf->tables))) {
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292 return NGX_CONF_ERROR;
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293 }
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294
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295 table->src = src;
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296 table->dst = dst;
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297
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298 if (!(table->src2dst = ngx_palloc(cf->pool, 256))) {
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299 return NGX_CONF_ERROR;
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300 }
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301
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302 if (!(table->dst2src = ngx_palloc(cf->pool, 256))) {
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303 return NGX_CONF_ERROR;
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304 }
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305
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306 for (i = 0; i < 128; i++) {
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307 table->src2dst[i] = (char) i;
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308 table->dst2src[i] = (char) i;
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309 }
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310
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311 for (/* void */; i < 256; i++) {
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312 table->src2dst[i] = '?';
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313 table->dst2src[i] = '?';
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314 }
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315
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316 pvcf = *cf;
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317 cf->ctx = table;
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318 cf->handler = ngx_charset_map;
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319 cf->handler_conf = conf;
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320 rv = ngx_conf_parse(cf, NULL);
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321 *cf = pvcf;
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322
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323 return rv;
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324 }
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325
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326
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327 static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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328 {
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329 ngx_int_t src, dst;
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330 ngx_str_t *value;
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331 ngx_http_charset_tables_t *table;
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332
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333 if (cf->args->nelts != 2) {
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334 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number");
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335 return NGX_CONF_ERROR;
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336 }
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337
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338 value = cf->args->elts;
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339
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340 src = ngx_hextoi(value[0].data, value[0].len);
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341 if (src == NGX_ERROR || src > 255) {
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342 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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343 "invalid value \"%s\"", value[0].data);
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344 return NGX_CONF_ERROR;
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345 }
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346
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347 dst = ngx_hextoi(value[1].data, value[1].len);
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348 if (dst == NGX_ERROR || dst > 255) {
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349 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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350 "invalid value \"%s\"", value[1].data);
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351 return NGX_CONF_ERROR;
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352 }
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353
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354 table = cf->ctx;
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355
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356 table->src2dst[src] = (char) dst;
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357 table->dst2src[dst] = (char) src;
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358
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359 return NGX_CONF_OK;
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360 }
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361
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362
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363 static char *ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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364 void *conf)
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365 {
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366 char *p = conf;
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367
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368 ngx_int_t *cp;
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369 ngx_str_t *value;
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370 ngx_http_charset_t *charset;
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371 ngx_http_charset_main_conf_t *mcf;
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372
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373 cp = (ngx_int_t *) (p + cmd->offset);
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374
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375 if (*cp != NGX_CONF_UNSET) {
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376 return "is duplicate";
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377 }
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378
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379 mcf = ngx_http_conf_get_module_main_conf(cf,
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380 ngx_http_charset_filter_module);
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381
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382 value = cf->args->elts;
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383
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384 *cp = ngx_http_add_charset(&mcf->charsets, &value[1]);
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385 if (*cp == NGX_ERROR) {
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386 return NGX_CONF_ERROR;
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387 }
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388
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389 if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, source_charset)) {
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390 charset = mcf->charsets.elts;
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391 charset[*cp].server = 1;
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392 }
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393
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394 return NGX_CONF_OK;
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395 }
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396
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397
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398 static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name)
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399 {
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400 ngx_uint_t i;
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401 ngx_http_charset_t *c;
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402
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403 c = charsets->elts;
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404 for (i = 0; i < charsets->nelts; i++) {
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405 if (name->len != c[i].name.len) {
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406 continue;
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407 }
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408
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409 if (ngx_strcasecmp(name->data, c[i].name.data) == 0) {
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410 break;
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411 }
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412 }
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413
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414 if (i < charsets->nelts) {
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415 return i;
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416 }
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417
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418 if (!(c = ngx_push_array(charsets))) {
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419 return NGX_ERROR;
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420 }
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421
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422 c->name = *name;
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423
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424 return i;
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425 }
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426
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427
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428 static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle)
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429 {
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430 ngx_http_next_header_filter = ngx_http_top_header_filter;
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431 ngx_http_top_header_filter = ngx_http_charset_header_filter;
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432
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433 ngx_http_next_body_filter = ngx_http_top_body_filter;
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434 ngx_http_top_body_filter = ngx_http_charset_body_filter;
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435
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436 return NGX_OK;
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437 }
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438
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439
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440 static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf)
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441 {
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442 ngx_http_charset_main_conf_t *mcf;
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443
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444 if (!(mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t)))) {
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445 return NGX_CONF_ERROR;
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446 }
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447
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448 ngx_init_array(mcf->charsets, cf->pool, 5, sizeof(ngx_http_charset_t),
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449 NGX_CONF_ERROR);
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450
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451 ngx_init_array(mcf->tables, cf->pool, 10, sizeof(ngx_http_charset_tables_t),
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452 NGX_CONF_ERROR);
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453
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454 return mcf;
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455 }
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456
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457
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458 static char *ngx_http_charset_init_main_conf(ngx_conf_t *cf, void *conf)
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459 {
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460 ngx_http_charset_main_conf_t *mcf = conf;
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461
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462 ngx_uint_t i, n;
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463 ngx_http_charset_t *charset;
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464 ngx_http_charset_tables_t *tables;
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465
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466 tables = mcf->tables.elts;
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467 charset = mcf->charsets.elts;
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468
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469 for (i = 0; i < mcf->charsets.nelts; i++) {
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470 if (!charset[i].server) {
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471 continue;
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472 }
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473
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474 charset[i].tables = ngx_pcalloc(cf->pool,
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475 sizeof(char *) * mcf->charsets.nelts);
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476
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|
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477 if (charset[i].tables == NULL) {
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|
|
478 return NGX_CONF_ERROR;
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|
|
479 }
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|
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480
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|
481 for (n = 0; n < mcf->tables.nelts; n++) {
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|
|
482 if ((ngx_int_t) i == tables[n].src) {
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|
|
483 charset[i].tables[tables[n].dst] = tables[n].src2dst;
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|
|
484 continue;
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|
|
485 }
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|
486
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|
|
487 if ((ngx_int_t) i == tables[n].dst) {
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|
|
488 charset[i].tables[tables[n].src] = tables[n].dst2src;
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|
|
489 }
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|
|
490 }
|
|
|
491 }
|
|
|
492
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|
|
493 for (i = 0; i < mcf->charsets.nelts; i++) {
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|
|
494 if (!charset[i].server) {
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|
|
495 continue;
|
|
|
496 }
|
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|
497
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|
|
498 for (n = 0; n < mcf->charsets.nelts; n++) {
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|
|
499 if (i == n) {
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|
|
500 continue;
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|
|
501 }
|
|
|
502
|
|
|
503 if (charset[i].tables[n]) {
|
|
|
504 continue;
|
|
|
505 }
|
|
|
506
|
|
|
507 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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|
|
508 " no \"charset_map\" between the charsets "
|
|
|
509 "\"%s\" and \"%s\"",
|
|
|
510 charset[i].name.data, charset[n].name.data);
|
|
|
511 return NGX_CONF_ERROR;
|
|
|
512 }
|
|
|
513 }
|
|
|
514
|
|
|
515 return NGX_CONF_OK;
|
|
|
516 }
|
|
|
517
|
|
|
518
|
|
|
519 static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf)
|
|
|
520 {
|
|
|
521 ngx_http_charset_loc_conf_t *lcf;
|
|
|
522
|
|
|
523 if (!(lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t)))) {
|
|
|
524 return NGX_CONF_ERROR;
|
|
|
525 }
|
|
|
526
|
|
|
527 lcf->enable = NGX_CONF_UNSET;
|
|
|
528 lcf->autodetect = NGX_CONF_UNSET;
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|
|
529 lcf->default_charset = NGX_CONF_UNSET;
|
|
|
530 lcf->source_charset = NGX_CONF_UNSET;
|
|
|
531
|
|
|
532 return lcf;
|
|
|
533 }
|
|
|
534
|
|
|
535
|
|
|
536 static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf,
|
|
|
537 void *parent, void *child)
|
|
|
538 {
|
|
|
539 ngx_http_charset_loc_conf_t *prev = parent;
|
|
|
540 ngx_http_charset_loc_conf_t *conf = child;
|
|
|
541
|
|
|
542 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
543 ngx_conf_merge_value(conf->autodetect, prev->autodetect, 0);
|
|
|
544
|
|
|
545 if (conf->source_charset == NGX_CONF_UNSET) {
|
|
|
546 conf->source_charset = prev->source_charset;
|
|
|
547 }
|
|
|
548
|
|
|
549 ngx_conf_merge_value(conf->default_charset, prev->default_charset,
|
|
|
550 conf->source_charset);
|
|
|
551
|
|
|
552 return NGX_CONF_OK;
|
|
|
553 }
|
