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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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122
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13 time_t expires;
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14 ngx_str_t cache_control;
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15 ngx_array_t *headers;
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50
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16 } ngx_http_headers_conf_t;
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17
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18
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19 #define NGX_HTTP_EXPIRES_UNSET -2147483647
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20 #define NGX_HTTP_EXPIRES_OFF -2147483646
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21 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
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22
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23
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24 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle);
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25 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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26 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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27 void *parent, void *child);
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50
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28 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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29 void *conf);
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122
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30 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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31 void *conf);
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50
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32
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33
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34 static ngx_command_t ngx_http_headers_filter_commands[] = {
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35
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36 { ngx_string("expires"),
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122
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37 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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38 |NGX_CONF_TAKE1,
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39 ngx_http_headers_expires,
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40 NGX_HTTP_LOC_CONF_OFFSET,
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41 0,
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42 NULL},
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43
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122
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44 { ngx_string("add_header"),
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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_TAKE2,
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47 ngx_http_headers_add,
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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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50
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52 ngx_null_command
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53 };
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54
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55
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56 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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57 NULL, /* preconfiguration */
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58 NULL, /* postconfiguration */
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50
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59
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60 NULL, /* create main configuration */
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61 NULL, /* init main configuration */
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62
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63 NULL, /* create server configuration */
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64 NULL, /* merge server configuration */
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65
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66 ngx_http_headers_create_conf, /* create location configuration */
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67 ngx_http_headers_merge_conf /* merge location configuration */
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68 };
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69
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70
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71 ngx_module_t ngx_http_headers_filter_module = {
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58
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72 NGX_MODULE_V1,
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73 &ngx_http_headers_filter_module_ctx, /* module context */
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74 ngx_http_headers_filter_commands, /* module directives */
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75 NGX_HTTP_MODULE, /* module type */
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90
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76 NULL, /* init master */
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77 ngx_http_headers_filter_init, /* init module */
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90
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78 NULL, /* init process */
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79 NULL, /* init thread */
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80 NULL, /* exit thread */
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81 NULL, /* exit process */
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82 NULL, /* exit master */
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83 NGX_MODULE_V1_PADDING
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50
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84 };
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85
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86
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87 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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88
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89
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90 static ngx_int_t
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91 ngx_http_headers_filter(ngx_http_request_t *r)
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92 {
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93 size_t len;
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58
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94 ngx_uint_t i;
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122
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95 ngx_table_elt_t *expires, *cc, **ccp, *h, *out;
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96 ngx_http_headers_conf_t *conf;
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97
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92
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98 if ((r->headers_out.status != NGX_HTTP_OK
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99 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
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102
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100 || r->main != r)
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92
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101 {
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102 return ngx_http_next_header_filter(r);
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103 }
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104
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105 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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106
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107 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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108
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58
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109 expires = r->headers_out.expires;
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110
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111 if (expires == NULL) {
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58
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112
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113 expires = ngx_list_push(&r->headers_out.headers);
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114 if (expires == NULL) {
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115 return NGX_ERROR;
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116 }
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117
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118 r->headers_out.expires = expires;
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119
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120 expires->hash = 1;
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121 expires->key.len = sizeof("Expires") - 1;
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122 expires->key.data = (u_char *) "Expires";
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50
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123 }
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124
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125 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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126 expires->value.len = len - 1;
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127
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86
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128 ccp = r->headers_out.cache_control.elts;
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129
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130 if (ccp == NULL) {
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58
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131
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86
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132 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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122
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133 1, sizeof(ngx_table_elt_t *))
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134 != NGX_OK)
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86
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135 {
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136 return NGX_ERROR;
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137 }
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138
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139 ccp = ngx_array_push(&r->headers_out.cache_control);
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140 if (ccp == NULL) {
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141 return NGX_ERROR;
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142 }
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58
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143
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144 cc = ngx_list_push(&r->headers_out.headers);
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145 if (cc == NULL) {
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146 return NGX_ERROR;
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147 }
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148
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149 cc->hash = 1;
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150 cc->key.len = sizeof("Cache-Control") - 1;
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151 cc->key.data = (u_char *) "Cache-Control";
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152
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86
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153 *ccp = cc;
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154
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58
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155 } else {
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156 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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86
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157 ccp[i]->hash = 0;
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58
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158 }
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86
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159
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160 cc = ccp[0];
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58
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161 }
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162
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163 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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164 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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165
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166 cc->value.len = sizeof("no-cache") - 1;
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167 cc->value.data = (u_char *) "no-cache";
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168
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169 } else {
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170 expires->value.data = ngx_palloc(r->pool, len);
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171 if (expires->value.data == NULL) {
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172 return NGX_ERROR;
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173 }
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174
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175 if (conf->expires == 0) {
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176 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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177 ngx_cached_http_time.len + 1);
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178
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179 cc->value.len = sizeof("max-age=0") - 1;
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180 cc->value.data = (u_char *) "max-age=0";
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181
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182 } else {
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183 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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184
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185 if (conf->expires < 0) {
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186 cc->value.len = sizeof("no-cache") - 1;
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187 cc->value.data = (u_char *) "no-cache";
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188
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189 } else {
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190 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
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191 + NGX_TIME_T_LEN + 1);
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192 if (cc->value.data == NULL) {
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193 return NGX_ERROR;
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194 }
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195
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196 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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197 conf->expires)
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198 - cc->value.data;
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199
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200 }
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201 }
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202 }
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203 }
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204
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122
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205 if (conf->cache_control.len) {
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206
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207 ccp = r->headers_out.cache_control.elts;
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208
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209 if (ccp == NULL) {
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210
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211 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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212 1, sizeof(ngx_table_elt_t *))
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213 != NGX_OK)
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214 {
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215 return NGX_ERROR;
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216 }
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217 }
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218
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219 ccp = ngx_array_push(&r->headers_out.cache_control);
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220 if (ccp == NULL) {
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221 return NGX_ERROR;
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222 }
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223
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224 cc = ngx_list_push(&r->headers_out.headers);
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225 if (cc == NULL) {
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226 return NGX_ERROR;
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227 }
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228
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229 cc->hash = 1;
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230 cc->key.len = sizeof("Cache-Control") - 1;
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231 cc->key.data = (u_char *) "Cache-Control";
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232 cc->value = conf->cache_control;
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233
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234 *ccp = cc;
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235 }
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236
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237 if (conf->headers) {
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238 h = conf->headers->elts;
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239 for (i = 0; i < conf->headers->nelts; i++) {
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240 out = ngx_list_push(&r->headers_out.headers);
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241 if (out == NULL) {
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242 return NGX_ERROR;
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243 }
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244
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245 *out = h[i];
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246 }
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247 }
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248
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249 return ngx_http_next_header_filter(r);
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250 }
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251
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252
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253 static ngx_int_t
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254 ngx_http_headers_filter_init(ngx_cycle_t *cycle)
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255 {
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256 ngx_http_next_header_filter = ngx_http_top_header_filter;
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257 ngx_http_top_header_filter = ngx_http_headers_filter;
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258
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259 return NGX_OK;
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260 }
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261
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262
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263 static void *
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264 ngx_http_headers_create_conf(ngx_conf_t *cf)
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126
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265 {
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266 ngx_http_headers_conf_t *conf;
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267
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122
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268 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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269 if (conf == NULL) {
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270 return NGX_CONF_ERROR;
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271 }
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272
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122
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273 /*
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274 * set by ngx_pcalloc():
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275 *
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276 * conf->cache_control.len = 0;
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277 * conf->cache_control.data = NULL;
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278 * conf->headers = NULL;
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279 */
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280
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281 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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282
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283 return conf;
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284 }
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285
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286
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287 static char *
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288 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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289 {
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290 ngx_http_headers_conf_t *prev = parent;
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291 ngx_http_headers_conf_t *conf = child;
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292
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293 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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294 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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295 NGX_HTTP_EXPIRES_OFF : prev->expires;
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296 }
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297
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122
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298 if (conf->cache_control.data == NULL) {
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299 conf->cache_control = prev->cache_control;
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300 }
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301
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302 if (conf->headers == NULL) {
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303 conf->headers = prev->headers;
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304 }
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305
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306 return NGX_CONF_OK;
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307 }
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308
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309
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310 static char *
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311 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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312 {
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313 ngx_http_headers_conf_t *hcf = conf;
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314
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315 ngx_uint_t minus;
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316 ngx_str_t *value;
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317
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318 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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319 return "is duplicate";
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320 }
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321
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322 value = cf->args->elts;
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323
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324 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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325 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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326 return NGX_CONF_OK;
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327 }
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328
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329 if (ngx_strcmp(value[1].data, "off") == 0) {
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330 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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331 return NGX_CONF_OK;
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332 }
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333
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334 if (value[1].data[0] == '+') {
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335 value[1].data++;
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336 value[1].len--;
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337 minus = 0;
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338
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339 } else if (value[1].data[0] == '-') {
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340 value[1].data++;
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341 value[1].len--;
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342 minus = 1;
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343
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344 } else {
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345 minus = 0;
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346 }
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347
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348 hcf->expires = ngx_parse_time(&value[1], 1);
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349
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350 if (hcf->expires == NGX_ERROR) {
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351 return "invalid value";
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352 }
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126
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353
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50
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354 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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355 return "value must be less than 68 years";
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356 }
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357
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358 if (minus) {
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359 hcf->expires = - hcf->expires;
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360 }
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361
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362 return NGX_CONF_OK;
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363 }
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122
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364
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365
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366 static char *
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367 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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368 {
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369 ngx_http_headers_conf_t *hcf = conf;
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370
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371 ngx_str_t *value;
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372 ngx_table_elt_t *h;
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373
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374 value = cf->args->elts;
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375
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376 if (ngx_strcasecmp(value[1].data, "cache-control") == 0) {
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377 hcf->cache_control = value[2];
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378 return NGX_CONF_OK;
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379 }
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380
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381 if (hcf->headers == NULL) {
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382 hcf->headers = ngx_array_create(cf->pool, 1, sizeof(ngx_table_elt_t));
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383 if (hcf->headers == NULL) {
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384 return NGX_CONF_ERROR;
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385 }
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386 }
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387
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388 h = ngx_array_push(hcf->headers);
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389 if (h == NULL) {
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390 return NGX_CONF_ERROR;
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391 }
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392
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393 h->hash = 1;
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394 h->key = value[1];
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395 h->value = value[2];
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396
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397 return NGX_CONF_OK;
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398 }
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