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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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13 time_t expires;
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14 } ngx_http_headers_conf_t;
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15
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16
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17 #define NGX_HTTP_EXPIRES_UNSET -2147483647
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18 #define NGX_HTTP_EXPIRES_OFF -2147483646
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19 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
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20
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21
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22 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle);
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23 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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24 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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25 void *parent, void *child);
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26 char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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27
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28
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29 static ngx_command_t ngx_http_headers_filter_commands[] = {
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30
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31 { ngx_string("expires"),
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32 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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33 ngx_http_headers_expires,
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34 NGX_HTTP_LOC_CONF_OFFSET,
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35 0,
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36 NULL},
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37
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38 ngx_null_command
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39 };
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40
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41
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42 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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43 NULL, /* pre conf */
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44
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45 NULL, /* create main configuration */
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46 NULL, /* init main configuration */
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47
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48 NULL, /* create server configuration */
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49 NULL, /* merge server configuration */
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50
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51 ngx_http_headers_create_conf, /* create location configuration */
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52 ngx_http_headers_merge_conf /* merge location configuration */
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53 };
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54
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55
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56 ngx_module_t ngx_http_headers_filter_module = {
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57 NGX_MODULE,
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58 &ngx_http_headers_filter_module_ctx, /* module context */
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59 ngx_http_headers_filter_commands, /* module directives */
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60 NGX_HTTP_MODULE, /* module type */
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61 ngx_http_headers_filter_init, /* init module */
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62 NULL /* init child */
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63 };
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64
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65
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66 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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67
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68
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69 static ngx_int_t ngx_http_headers_filter(ngx_http_request_t *r)
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70 {
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71 size_t len;
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72 ngx_table_elt_t *expires, *cc;
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73 ngx_http_headers_conf_t *conf;
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74
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75 if (r->headers_out.status != NGX_HTTP_OK) {
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76 return ngx_http_next_header_filter(r);
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77 }
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78
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79 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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80
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81 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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82
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83 if (!(expires = ngx_list_push(&r->headers_out.headers))) {
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84 return NGX_ERROR;
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85 }
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86
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87 r->headers_out.expires = expires;
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88
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89 if (!(cc = ngx_list_push(&r->headers_out.headers))) {
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90 return NGX_ERROR;
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91 }
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92
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93 r->headers_out.cache_control = cc;
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94
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95 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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96
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97 expires->key.len = sizeof("Expires") - 1;
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98 expires->key.data = (u_char *) "Expires";
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99 expires->value.len = len - 1;
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100
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101 cc->key.len = sizeof("Cache-Control") - 1;
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102 cc->key.data = (u_char *) "Cache-Control";
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103
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104 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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105 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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106
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107 cc->value.len = sizeof("no-cache") - 1;
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108 cc->value.data = (u_char *) "no-cache";
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109
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110 } else {
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111 expires->value.data = ngx_palloc(r->pool, len);
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112 if (expires->value.data == NULL) {
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113 return NGX_ERROR;
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114 }
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115
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116 if (conf->expires == 0) {
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117 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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118 ngx_cached_http_time.len + 1);
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119
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120 cc->value.len = sizeof("max-age=0") - 1;
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121 cc->value.data = (u_char *) "max-age=0";
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122
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123 } else {
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124 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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125
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126 if (conf->expires < 0) {
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127 cc->value.len = sizeof("no-cache") - 1;
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128 cc->value.data = (u_char *) "no-cache";
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129
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130 } else {
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131 cc->value.data = ngx_palloc(r->pool,
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132 sizeof("max-age=") + TIME_T_LEN + 1);
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133 if (cc->value.data == NULL) {
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134 return NGX_ERROR;
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135 }
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136
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4
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137 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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138 conf->expires)
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139 - cc->value.data;
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140
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141 #if 0
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0
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142 cc->value.len = ngx_snprintf((char *) cc->value.data,
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143 sizeof("max-age=") + TIME_T_LEN,
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144 "max-age=" TIME_T_FMT,
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145 conf->expires);
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4
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146 #endif
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0
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147 }
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148 }
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149 }
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150 }
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151
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152 return ngx_http_next_header_filter(r);
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153 }
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154
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155
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156 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle)
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157 {
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158 ngx_http_next_header_filter = ngx_http_top_header_filter;
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159 ngx_http_top_header_filter = ngx_http_headers_filter;
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160
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161 return NGX_OK;
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162 }
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163
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164
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165 static void *ngx_http_headers_create_conf(ngx_conf_t *cf)
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166 {
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167 ngx_http_headers_conf_t *conf;
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168
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169 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t)))) {
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170 return NGX_CONF_ERROR;
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171 }
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172
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173 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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174
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175 return conf;
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176 }
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177
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178
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179 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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180 void *parent, void *child)
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181 {
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182 ngx_http_headers_conf_t *prev = parent;
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183 ngx_http_headers_conf_t *conf = child;
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184
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185 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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186 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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187 NGX_HTTP_EXPIRES_OFF : prev->expires;
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188 }
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189
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190 return NGX_CONF_OK;
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191 }
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192
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193
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194 char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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195 {
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196 ngx_http_headers_conf_t *hcf = conf;
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197
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198 ngx_uint_t minus;
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199 ngx_str_t *value;
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200
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201 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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202 return "is duplicate";
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203 }
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204
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205 value = cf->args->elts;
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206
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207 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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208 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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209 return NGX_CONF_OK;
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210 }
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211
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212 if (ngx_strcmp(value[1].data, "off") == 0) {
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213 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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214 return NGX_CONF_OK;
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215 }
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216
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217 if (value[1].data[0] == '+') {
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218 value[1].data++;
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219 value[1].len--;
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220 minus = 0;
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221
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222 } else if (value[1].data[0] == '-') {
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223 value[1].data++;
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224 value[1].len--;
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225 minus = 1;
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226
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227 } else {
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228 minus = 0;
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229 }
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230
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231 hcf->expires = ngx_parse_time(&value[1], 1);
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232 if (hcf->expires == NGX_ERROR) {
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233 return "invalid value";
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234 }
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235
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236 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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237 return "value must be less than 68 years";
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238 }
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239
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240 if (minus) {
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241 hcf->expires = - hcf->expires;
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242 }
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243
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244 return NGX_CONF_OK;
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245 }
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