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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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26
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131 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
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132 + NGX_TIME_T_LEN + 1);
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0
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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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0
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141 }
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142 }
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143 }
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144 }
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145
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146 return ngx_http_next_header_filter(r);
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147 }
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148
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149
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150 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle)
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151 {
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152 ngx_http_next_header_filter = ngx_http_top_header_filter;
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153 ngx_http_top_header_filter = ngx_http_headers_filter;
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154
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155 return NGX_OK;
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156 }
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157
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158
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159 static void *ngx_http_headers_create_conf(ngx_conf_t *cf)
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160 {
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161 ngx_http_headers_conf_t *conf;
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162
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163 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t)))) {
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164 return NGX_CONF_ERROR;
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165 }
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166
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167 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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168
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169 return conf;
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170 }
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171
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172
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173 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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174 void *parent, void *child)
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175 {
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176 ngx_http_headers_conf_t *prev = parent;
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177 ngx_http_headers_conf_t *conf = child;
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178
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179 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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180 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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181 NGX_HTTP_EXPIRES_OFF : prev->expires;
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182 }
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183
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184 return NGX_CONF_OK;
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185 }
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186
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187
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188 char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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189 {
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190 ngx_http_headers_conf_t *hcf = conf;
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191
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192 ngx_uint_t minus;
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193 ngx_str_t *value;
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194
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195 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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196 return "is duplicate";
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197 }
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198
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199 value = cf->args->elts;
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200
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201 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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202 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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203 return NGX_CONF_OK;
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204 }
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205
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206 if (ngx_strcmp(value[1].data, "off") == 0) {
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207 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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208 return NGX_CONF_OK;
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209 }
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210
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211 if (value[1].data[0] == '+') {
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212 value[1].data++;
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213 value[1].len--;
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214 minus = 0;
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215
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216 } else if (value[1].data[0] == '-') {
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217 value[1].data++;
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218 value[1].len--;
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219 minus = 1;
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220
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221 } else {
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222 minus = 0;
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223 }
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224
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225 hcf->expires = ngx_parse_time(&value[1], 1);
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226 if (hcf->expires == NGX_ERROR) {
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227 return "invalid value";
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228 }
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229
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230 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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231 return "value must be less than 68 years";
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232 }
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233
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234 if (minus) {
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235 hcf->expires = - hcf->expires;
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236 }
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237
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238 return NGX_CONF_OK;
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239 }
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