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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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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 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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27 void *conf);
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28
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29
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30 static ngx_command_t ngx_http_headers_filter_commands[] = {
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31
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32 { ngx_string("expires"),
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33 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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34 ngx_http_headers_expires,
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35 NGX_HTTP_LOC_CONF_OFFSET,
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36 0,
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37 NULL},
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38
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39 ngx_null_command
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40 };
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41
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42
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43 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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44 NULL, /* pre conf */
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45
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46 NULL, /* create main configuration */
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47 NULL, /* init main configuration */
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48
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49 NULL, /* create server configuration */
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50 NULL, /* merge server configuration */
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51
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52 ngx_http_headers_create_conf, /* create location configuration */
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53 ngx_http_headers_merge_conf /* merge location configuration */
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54 };
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55
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56
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57 ngx_module_t ngx_http_headers_filter_module = {
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58 NGX_MODULE,
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59 &ngx_http_headers_filter_module_ctx, /* module context */
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60 ngx_http_headers_filter_commands, /* module directives */
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61 NGX_HTTP_MODULE, /* module type */
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62 ngx_http_headers_filter_init, /* init module */
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63 NULL /* init process */
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64 };
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65
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66
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67 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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68
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69
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70 static ngx_int_t
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71 ngx_http_headers_filter(ngx_http_request_t *r)
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72 {
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73 size_t len;
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74 ngx_table_elt_t *expires, *cc;
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75 ngx_http_headers_conf_t *conf;
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76
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77 if (r->headers_out.status != NGX_HTTP_OK) {
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78 return ngx_http_next_header_filter(r);
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79 }
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80
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81 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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82
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83 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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84
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85 expires = ngx_list_push(&r->headers_out.headers);
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86 if (expires == NULL) {
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87 return NGX_ERROR;
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88 }
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89
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90 r->headers_out.expires = expires;
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91
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92 cc = ngx_list_push(&r->headers_out.headers);
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93 if (cc == NULL) {
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94 return NGX_ERROR;
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95 }
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96
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97 r->headers_out.cache_control = cc;
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98
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99 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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100
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101 expires->key.len = sizeof("Expires") - 1;
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102 expires->key.data = (u_char *) "Expires";
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103 expires->value.len = len - 1;
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104
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105 cc->key.len = sizeof("Cache-Control") - 1;
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106 cc->key.data = (u_char *) "Cache-Control";
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107
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108 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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109 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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110
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111 cc->value.len = sizeof("no-cache") - 1;
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112 cc->value.data = (u_char *) "no-cache";
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113
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114 } else {
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115 expires->value.data = ngx_palloc(r->pool, len);
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116 if (expires->value.data == NULL) {
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117 return NGX_ERROR;
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118 }
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119
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120 if (conf->expires == 0) {
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121 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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122 ngx_cached_http_time.len + 1);
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123
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124 cc->value.len = sizeof("max-age=0") - 1;
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125 cc->value.data = (u_char *) "max-age=0";
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126
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127 } else {
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128 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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129
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130 if (conf->expires < 0) {
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131 cc->value.len = sizeof("no-cache") - 1;
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132 cc->value.data = (u_char *) "no-cache";
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133
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134 } else {
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135 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
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136 + NGX_TIME_T_LEN + 1);
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137 if (cc->value.data == NULL) {
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138 return NGX_ERROR;
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139 }
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140
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141 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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142 conf->expires)
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143 - cc->value.data;
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144
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145 }
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146 }
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147 }
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148 }
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149
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150 return ngx_http_next_header_filter(r);
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151 }
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152
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153
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154 static ngx_int_t
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155 ngx_http_headers_filter_init(ngx_cycle_t *cycle)
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156 {
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157 ngx_http_next_header_filter = ngx_http_top_header_filter;
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158 ngx_http_top_header_filter = ngx_http_headers_filter;
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159
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160 return NGX_OK;
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161 }
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162
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163
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164 static void *
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165 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 conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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170 if (conf == NULL) {
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171 return NGX_CONF_ERROR;
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172 }
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173
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174 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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175
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176 return conf;
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177 }
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178
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179
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180 static char *
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181 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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182 {
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183 ngx_http_headers_conf_t *prev = parent;
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184 ngx_http_headers_conf_t *conf = child;
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185
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186 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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187 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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188 NGX_HTTP_EXPIRES_OFF : prev->expires;
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189 }
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190
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191 return NGX_CONF_OK;
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192 }
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193
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194
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195 static char *
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196 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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197 {
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198 ngx_http_headers_conf_t *hcf = conf;
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199
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200 ngx_uint_t minus;
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201 ngx_str_t *value;
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202
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203 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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204 return "is duplicate";
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205 }
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206
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207 value = cf->args->elts;
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208
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209 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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210 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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211 return NGX_CONF_OK;
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212 }
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213
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214 if (ngx_strcmp(value[1].data, "off") == 0) {
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215 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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216 return NGX_CONF_OK;
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217 }
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218
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219 if (value[1].data[0] == '+') {
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220 value[1].data++;
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221 value[1].len--;
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222 minus = 0;
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223
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224 } else if (value[1].data[0] == '-') {
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225 value[1].data++;
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226 value[1].len--;
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227 minus = 1;
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228
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229 } else {
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230 minus = 0;
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231 }
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232
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233 hcf->expires = ngx_parse_time(&value[1], 1);
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234
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235 if (hcf->expires == NGX_ERROR) {
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236 return "invalid value";
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237 }
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238
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239 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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240 return "value must be less than 68 years";
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241 }
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242
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243 if (minus) {
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244 hcf->expires = - hcf->expires;
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245 }
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246
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247 return NGX_CONF_OK;
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248 }
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