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