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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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174
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13 ngx_table_elt_t value;
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14 ngx_array_t *lengths;
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15 ngx_array_t *values;
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16 } ngx_http_header_val_t;
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17
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18
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19 typedef struct {
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20 time_t expires;
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21 ngx_str_t cache_control;
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22 ngx_array_t *headers;
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50
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23 } ngx_http_headers_conf_t;
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24
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25
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26 #define NGX_HTTP_EXPIRES_UNSET -2147483647
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27 #define NGX_HTTP_EXPIRES_OFF -2147483646
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28 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
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238
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29 #define NGX_HTTP_EXPIRES_MAX -2147483644
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50
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30
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31
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32 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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33 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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34 void *parent, void *child);
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230
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35 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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36 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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37 void *conf);
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122
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38 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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39 void *conf);
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50
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40
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41
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42 static ngx_command_t ngx_http_headers_filter_commands[] = {
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43
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44 { ngx_string("expires"),
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122
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45 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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46 |NGX_CONF_TAKE1,
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50
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47 ngx_http_headers_expires,
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48 NGX_HTTP_LOC_CONF_OFFSET,
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49 0,
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50 NULL},
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51
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122
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52 { ngx_string("add_header"),
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53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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54 |NGX_CONF_TAKE2,
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55 ngx_http_headers_add,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 0,
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58 NULL},
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59
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50
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60 ngx_null_command
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61 };
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62
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63
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64 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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65 NULL, /* preconfiguration */
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230
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66 ngx_http_headers_filter_init, /* postconfiguration */
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67
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68 NULL, /* create main configuration */
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69 NULL, /* init main configuration */
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70
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71 NULL, /* create server configuration */
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72 NULL, /* merge server configuration */
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73
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74 ngx_http_headers_create_conf, /* create location configuration */
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75 ngx_http_headers_merge_conf /* merge location configuration */
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76 };
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77
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78
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79 ngx_module_t ngx_http_headers_filter_module = {
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58
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80 NGX_MODULE_V1,
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50
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81 &ngx_http_headers_filter_module_ctx, /* module context */
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82 ngx_http_headers_filter_commands, /* module directives */
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83 NGX_HTTP_MODULE, /* module type */
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90
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84 NULL, /* init master */
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230
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85 NULL, /* init module */
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90
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86 NULL, /* init process */
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87 NULL, /* init thread */
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88 NULL, /* exit thread */
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89 NULL, /* exit process */
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90 NULL, /* exit master */
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91 NGX_MODULE_V1_PADDING
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50
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92 };
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93
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94
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95 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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96
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97
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98 static ngx_int_t
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99 ngx_http_headers_filter(ngx_http_request_t *r)
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100 {
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101 size_t len;
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58
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102 ngx_uint_t i;
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174
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103 ngx_table_elt_t *expires, *cc, **ccp, *out;
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104 ngx_http_header_val_t *h;
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50
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105 ngx_http_headers_conf_t *conf;
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106
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212
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107 if (r != r->main
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108 || (r->headers_out.status != NGX_HTTP_OK
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109 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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110 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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111 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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112 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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92
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113 {
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50
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114 return ngx_http_next_header_filter(r);
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115 }
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116
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117 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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118
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119 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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120
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121 expires = r->headers_out.expires;
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122
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123 if (expires == NULL) {
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58
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124
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125 expires = ngx_list_push(&r->headers_out.headers);
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126 if (expires == NULL) {
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127 return NGX_ERROR;
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128 }
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129
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130 r->headers_out.expires = expires;
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131
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132 expires->hash = 1;
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133 expires->key.len = sizeof("Expires") - 1;
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134 expires->key.data = (u_char *) "Expires";
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50
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135 }
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136
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137 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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138 expires->value.len = len - 1;
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139
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86
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140 ccp = r->headers_out.cache_control.elts;
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141
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142 if (ccp == NULL) {
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58
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143
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86
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144 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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122
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145 1, sizeof(ngx_table_elt_t *))
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146 != NGX_OK)
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86
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147 {
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148 return NGX_ERROR;
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149 }
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150
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151 ccp = ngx_array_push(&r->headers_out.cache_control);
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152 if (ccp == NULL) {
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153 return NGX_ERROR;
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154 }
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58
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155
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156 cc = ngx_list_push(&r->headers_out.headers);
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157 if (cc == NULL) {
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158 return NGX_ERROR;
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159 }
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160
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161 cc->hash = 1;
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162 cc->key.len = sizeof("Cache-Control") - 1;
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163 cc->key.data = (u_char *) "Cache-Control";
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164
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86
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165 *ccp = cc;
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166
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58
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167 } else {
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168 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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86
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169 ccp[i]->hash = 0;
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58
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170 }
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86
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171
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172 cc = ccp[0];
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58
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173 }
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50
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174
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175 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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176 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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177
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178 cc->value.len = sizeof("no-cache") - 1;
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179 cc->value.data = (u_char *) "no-cache";
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180
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238
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181 } else if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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182 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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183
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184 /* 10 years */
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185 cc->value.len = sizeof("max-age=315360000") - 1;
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186 cc->value.data = (u_char *) "max-age=315360000";
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187
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50
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188 } else {
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189 expires->value.data = ngx_palloc(r->pool, len);
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190 if (expires->value.data == NULL) {
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191 return NGX_ERROR;
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192 }
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193
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194 if (conf->expires == 0) {
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195 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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196 ngx_cached_http_time.len + 1);
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197
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198 cc->value.len = sizeof("max-age=0") - 1;
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199 cc->value.data = (u_char *) "max-age=0";
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200
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201 } else {
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202 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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203
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204 if (conf->expires < 0) {
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205 cc->value.len = sizeof("no-cache") - 1;
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206 cc->value.data = (u_char *) "no-cache";
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207
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208 } else {
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209 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
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210 + NGX_TIME_T_LEN + 1);
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211 if (cc->value.data == NULL) {
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212 return NGX_ERROR;
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213 }
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214
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215 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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216 conf->expires)
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217 - cc->value.data;
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218 }
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219 }
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220 }
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221 }
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222
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122
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223 if (conf->cache_control.len) {
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224
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225 ccp = r->headers_out.cache_control.elts;
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226
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227 if (ccp == NULL) {
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228
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229 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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230 1, sizeof(ngx_table_elt_t *))
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231 != NGX_OK)
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232 {
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233 return NGX_ERROR;
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234 }
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235 }
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236
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237 ccp = ngx_array_push(&r->headers_out.cache_control);
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238 if (ccp == NULL) {
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239 return NGX_ERROR;
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240 }
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241
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242 cc = ngx_list_push(&r->headers_out.headers);
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243 if (cc == NULL) {
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244 return NGX_ERROR;
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245 }
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246
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247 cc->hash = 1;
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248 cc->key.len = sizeof("Cache-Control") - 1;
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249 cc->key.data = (u_char *) "Cache-Control";
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250 cc->value = conf->cache_control;
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251
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252 *ccp = cc;
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253 }
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254
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255 if (conf->headers) {
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256 h = conf->headers->elts;
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257 for (i = 0; i < conf->headers->nelts; i++) {
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258 out = ngx_list_push(&r->headers_out.headers);
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259 if (out == NULL) {
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260 return NGX_ERROR;
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261 }
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262
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174
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263 out->hash = h[i].value.hash;
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264 out->key = h[i].value.key;
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265
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266 if (h[i].lengths == NULL) {
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267 out->value = h[i].value.value;
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268 continue;
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269 }
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270
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271 if (ngx_http_script_run(r, &out->value, h[i].lengths->elts, 0,
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272 h[i].values->elts)
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273 == NULL)
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274 {
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275 return NGX_ERROR;
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276 }
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122
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277 }
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278 }
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279
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280 return ngx_http_next_header_filter(r);
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281 }
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282
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283
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284 static void *
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285 ngx_http_headers_create_conf(ngx_conf_t *cf)
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126
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286 {
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50
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287 ngx_http_headers_conf_t *conf;
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288
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122
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289 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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50
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290 if (conf == NULL) {
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291 return NGX_CONF_ERROR;
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292 }
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293
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122
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294 /*
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295 * set by ngx_pcalloc():
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296 *
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297 * conf->cache_control.len = 0;
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298 * conf->cache_control.data = NULL;
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299 * conf->headers = NULL;
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300 */
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301
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302 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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303
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304 return conf;
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305 }
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306
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307
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308 static char *
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309 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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310 {
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311 ngx_http_headers_conf_t *prev = parent;
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312 ngx_http_headers_conf_t *conf = child;
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313
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314 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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315 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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316 NGX_HTTP_EXPIRES_OFF : prev->expires;
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317 }
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318
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122
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319 if (conf->cache_control.data == NULL) {
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320 conf->cache_control = prev->cache_control;
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321 }
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322
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323 if (conf->headers == NULL) {
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324 conf->headers = prev->headers;
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325 }
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326
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50
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327 return NGX_CONF_OK;
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328 }
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329
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330
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230
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331 static ngx_int_t
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332 ngx_http_headers_filter_init(ngx_conf_t *cf)
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333 {
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334 ngx_http_next_header_filter = ngx_http_top_header_filter;
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335 ngx_http_top_header_filter = ngx_http_headers_filter;
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336
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337 return NGX_OK;
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338 }
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339
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340
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50
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341 static char *
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342 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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343 {
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344 ngx_http_headers_conf_t *hcf = conf;
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345
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346 ngx_uint_t minus;
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347 ngx_str_t *value;
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348
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349 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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350 return "is duplicate";
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351 }
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352
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353 value = cf->args->elts;
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354
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355 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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356 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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357 return NGX_CONF_OK;
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358 }
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359
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238
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360 if (ngx_strcmp(value[1].data, "max") == 0) {
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361 hcf->expires = NGX_HTTP_EXPIRES_MAX;
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362 return NGX_CONF_OK;
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363 }
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364
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50
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365 if (ngx_strcmp(value[1].data, "off") == 0) {
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366 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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367 return NGX_CONF_OK;
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368 }
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369
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370 if (value[1].data[0] == '+') {
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371 value[1].data++;
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372 value[1].len--;
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373 minus = 0;
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374
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375 } else if (value[1].data[0] == '-') {
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376 value[1].data++;
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377 value[1].len--;
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378 minus = 1;
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379
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380 } else {
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381 minus = 0;
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382 }
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383
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384 hcf->expires = ngx_parse_time(&value[1], 1);
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385
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386 if (hcf->expires == NGX_ERROR) {
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387 return "invalid value";
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388 }
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126
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389
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50
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390 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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391 return "value must be less than 68 years";
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392 }
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393
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394 if (minus) {
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395 hcf->expires = - hcf->expires;
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396 }
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397
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398 return NGX_CONF_OK;
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399 }
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122
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400
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401
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402 static char *
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403 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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404 {
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405 ngx_http_headers_conf_t *hcf = conf;
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406
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174
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407 ngx_int_t n;
|
|
|
408 ngx_str_t *value;
|
|
|
409 ngx_http_header_val_t *h;
|
|
|
410 ngx_http_script_compile_t sc;
|
|
122
|
411
|
|
|
412 value = cf->args->elts;
|
|
|
413
|
|
286
|
414 if (ngx_strcasecmp(value[1].data, (u_char *) "cache-control") == 0) {
|
|
122
|
415 hcf->cache_control = value[2];
|
|
|
416 return NGX_CONF_OK;
|
|
|
417 }
|
|
|
418
|
|
|
419 if (hcf->headers == NULL) {
|
|
174
|
420 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
421 sizeof(ngx_http_header_val_t));
|
|
122
|
422 if (hcf->headers == NULL) {
|
|
|
423 return NGX_CONF_ERROR;
|
|
|
424 }
|
|
|
425 }
|
|
|
426
|
|
|
427 h = ngx_array_push(hcf->headers);
|
|
|
428 if (h == NULL) {
|
|
|
429 return NGX_CONF_ERROR;
|
|
|
430 }
|
|
|
431
|
|
174
|
432 h->value.hash = 1;
|
|
|
433 h->value.key = value[1];
|
|
|
434 h->value.value = value[2];
|
|
|
435 h->lengths = NULL;
|
|
|
436 h->values = NULL;
|
|
|
437
|
|
|
438 n = ngx_http_script_variables_count(&value[2]);
|
|
|
439
|
|
|
440 if (n == 0) {
|
|
|
441 return NGX_CONF_OK;
|
|
|
442 }
|
|
|
443
|
|
|
444 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
445
|
|
|
446 sc.cf = cf;
|
|
|
447 sc.source = &value[2];
|
|
|
448 sc.lengths = &h->lengths;
|
|
|
449 sc.values = &h->values;
|
|
|
450 sc.variables = n;
|
|
|
451 sc.complete_lengths = 1;
|
|
|
452 sc.complete_values = 1;
|
|
|
453
|
|
|
454 if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
|
455 return NGX_CONF_ERROR;
|
|
|
456 }
|
|
122
|
457
|
|
|
458 return NGX_CONF_OK;
|
|
|
459 }
|
