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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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58
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44 NULL, /* preconfiguration */
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45 NULL, /* postconfiguration */
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50
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46
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47 NULL, /* create main configuration */
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48 NULL, /* init main configuration */
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49
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50 NULL, /* create server configuration */
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51 NULL, /* merge server configuration */
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52
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53 ngx_http_headers_create_conf, /* create location configuration */
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54 ngx_http_headers_merge_conf /* merge location configuration */
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55 };
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56
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57
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58 ngx_module_t ngx_http_headers_filter_module = {
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58
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59 NGX_MODULE_V1,
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60 &ngx_http_headers_filter_module_ctx, /* module context */
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61 ngx_http_headers_filter_commands, /* module directives */
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62 NGX_HTTP_MODULE, /* module type */
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90
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63 NULL, /* init master */
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64 ngx_http_headers_filter_init, /* init module */
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90
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65 NULL, /* init process */
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66 NULL, /* init thread */
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67 NULL, /* exit thread */
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68 NULL, /* exit process */
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69 NULL, /* exit master */
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70 NGX_MODULE_V1_PADDING
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50
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71 };
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72
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73
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74 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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75
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76
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77 static ngx_int_t
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78 ngx_http_headers_filter(ngx_http_request_t *r)
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79 {
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80 size_t len;
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81 ngx_uint_t i;
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86
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82 ngx_table_elt_t *expires, *cc, **ccp;
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83 ngx_http_headers_conf_t *conf;
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84
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85 if (r->headers_out.status != NGX_HTTP_OK || r->main) {
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86 return ngx_http_next_header_filter(r);
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87 }
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88
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89 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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90
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91 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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92
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93 expires = r->headers_out.expires;
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94
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95 if (expires == NULL) {
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96
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97 expires = ngx_list_push(&r->headers_out.headers);
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98 if (expires == NULL) {
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99 return NGX_ERROR;
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100 }
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101
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102 r->headers_out.expires = expires;
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103
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104 expires->hash = 1;
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105 expires->key.len = sizeof("Expires") - 1;
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106 expires->key.data = (u_char *) "Expires";
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107 }
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108
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109 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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110 expires->value.len = len - 1;
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111
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86
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112 ccp = r->headers_out.cache_control.elts;
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113
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114 if (ccp == NULL) {
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115
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86
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116 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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117 1, sizeof(ngx_table_elt_t *)) != NGX_OK)
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118 {
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119 return NGX_ERROR;
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120 }
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121
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122 ccp = ngx_array_push(&r->headers_out.cache_control);
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123 if (ccp == NULL) {
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124 return NGX_ERROR;
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125 }
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126
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127 cc = ngx_list_push(&r->headers_out.headers);
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128 if (cc == NULL) {
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129 return NGX_ERROR;
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130 }
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131
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132 cc->hash = 1;
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133 cc->key.len = sizeof("Cache-Control") - 1;
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134 cc->key.data = (u_char *) "Cache-Control";
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135
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86
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136 *ccp = cc;
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137
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58
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138 } else {
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139 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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86
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140 ccp[i]->hash = 0;
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58
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141 }
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86
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142
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143 cc = ccp[0];
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58
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144 }
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145
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146 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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147 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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148
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149 cc->value.len = sizeof("no-cache") - 1;
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150 cc->value.data = (u_char *) "no-cache";
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151
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152 } else {
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153 expires->value.data = ngx_palloc(r->pool, len);
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154 if (expires->value.data == NULL) {
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155 return NGX_ERROR;
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156 }
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157
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158 if (conf->expires == 0) {
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159 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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160 ngx_cached_http_time.len + 1);
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161
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162 cc->value.len = sizeof("max-age=0") - 1;
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163 cc->value.data = (u_char *) "max-age=0";
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164
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165 } else {
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166 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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167
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168 if (conf->expires < 0) {
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169 cc->value.len = sizeof("no-cache") - 1;
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170 cc->value.data = (u_char *) "no-cache";
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171
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172 } else {
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173 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
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174 + NGX_TIME_T_LEN + 1);
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175 if (cc->value.data == NULL) {
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176 return NGX_ERROR;
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177 }
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178
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179 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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180 conf->expires)
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181 - cc->value.data;
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182
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183 }
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184 }
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185 }
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186 }
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187
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188 return ngx_http_next_header_filter(r);
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189 }
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190
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191
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192 static ngx_int_t
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193 ngx_http_headers_filter_init(ngx_cycle_t *cycle)
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194 {
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195 ngx_http_next_header_filter = ngx_http_top_header_filter;
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196 ngx_http_top_header_filter = ngx_http_headers_filter;
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197
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198 return NGX_OK;
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199 }
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200
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201
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202 static void *
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203 ngx_http_headers_create_conf(ngx_conf_t *cf)
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204 {
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205 ngx_http_headers_conf_t *conf;
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206
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207 conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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208 if (conf == NULL) {
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209 return NGX_CONF_ERROR;
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210 }
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211
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212 conf->expires = NGX_HTTP_EXPIRES_UNSET;
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213
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214 return conf;
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215 }
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216
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217
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218 static char *
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219 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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220 {
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221 ngx_http_headers_conf_t *prev = parent;
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222 ngx_http_headers_conf_t *conf = child;
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223
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224 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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225 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
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226 NGX_HTTP_EXPIRES_OFF : prev->expires;
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227 }
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228
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229 return NGX_CONF_OK;
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230 }
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231
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232
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233 static char *
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234 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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235 {
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236 ngx_http_headers_conf_t *hcf = conf;
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237
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238 ngx_uint_t minus;
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239 ngx_str_t *value;
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240
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241 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
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242 return "is duplicate";
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243 }
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244
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245 value = cf->args->elts;
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246
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247 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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248 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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249 return NGX_CONF_OK;
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250 }
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251
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252 if (ngx_strcmp(value[1].data, "off") == 0) {
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253 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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254 return NGX_CONF_OK;
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255 }
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256
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257 if (value[1].data[0] == '+') {
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258 value[1].data++;
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259 value[1].len--;
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260 minus = 0;
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261
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262 } else if (value[1].data[0] == '-') {
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263 value[1].data++;
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264 value[1].len--;
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265 minus = 1;
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266
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267 } else {
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268 minus = 0;
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269 }
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270
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271 hcf->expires = ngx_parse_time(&value[1], 1);
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272
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273 if (hcf->expires == NGX_ERROR) {
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274 return "invalid value";
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275 }
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276
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277 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
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278 return "value must be less than 68 years";
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279 }
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280
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281 if (minus) {
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282 hcf->expires = - hcf->expires;
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283 }
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284
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285 return NGX_CONF_OK;
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286 }
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