Mercurial > hg > nginx
annotate src/http/modules/ngx_http_headers_filter_module.c @ 4491:d11f86a16e3b
Added support for the 307 Temporary Redirect.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 27 Feb 2012 11:43:40 +0000 |
parents | 41f640a693de |
children | 2577c27cbffd |
rev | line source |
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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11 |
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12 |
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13 typedef struct ngx_http_header_val_s ngx_http_header_val_t; |
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14 |
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15 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r, |
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16 ngx_http_header_val_t *hv, ngx_str_t *value); |
625 | 17 |
18 | |
19 typedef struct { | |
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20 ngx_str_t name; |
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21 ngx_uint_t offset; |
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22 ngx_http_set_header_pt handler; |
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23 } ngx_http_set_header_t; |
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24 |
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25 |
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26 struct ngx_http_header_val_s { |
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27 ngx_http_complex_value_t value; |
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28 ngx_uint_t hash; |
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29 ngx_str_t key; |
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30 ngx_http_set_header_pt handler; |
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31 ngx_uint_t offset; |
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32 }; |
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33 |
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34 |
2013 | 35 #define NGX_HTTP_EXPIRES_OFF 0 |
36 #define NGX_HTTP_EXPIRES_EPOCH 1 | |
37 #define NGX_HTTP_EXPIRES_MAX 2 | |
38 #define NGX_HTTP_EXPIRES_ACCESS 3 | |
39 #define NGX_HTTP_EXPIRES_MODIFIED 4 | |
2163 | 40 #define NGX_HTTP_EXPIRES_DAILY 5 |
2013 | 41 |
42 | |
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43 typedef struct { |
2013 | 44 ngx_uint_t expires; |
45 time_t expires_time; | |
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46 ngx_array_t *headers; |
326
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47 } ngx_http_headers_conf_t; |
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48 |
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49 |
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50 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r, |
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51 ngx_http_headers_conf_t *conf); |
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52 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r, |
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53 ngx_http_header_val_t *hv, ngx_str_t *value); |
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54 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r, |
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55 ngx_http_header_val_t *hv, ngx_str_t *value); |
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56 |
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57 static void *ngx_http_headers_create_conf(ngx_conf_t *cf); |
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58 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf, |
573 | 59 void *parent, void *child); |
681 | 60 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf); |
501 | 61 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, |
62 void *conf); | |
573 | 63 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, |
64 void *conf); | |
326
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65 |
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66 |
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67 static ngx_http_set_header_t ngx_http_set_headers[] = { |
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68 |
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69 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control }, |
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70 |
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71 { ngx_string("Last-Modified"), |
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72 offsetof(ngx_http_headers_out_t, last_modified), |
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73 ngx_http_set_last_modified }, |
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74 |
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75 { ngx_null_string, 0, NULL } |
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76 }; |
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77 |
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78 |
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79 static ngx_command_t ngx_http_headers_filter_commands[] = { |
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80 |
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81 { ngx_string("expires"), |
573 | 82 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |
2013 | 83 |NGX_CONF_TAKE12, |
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84 ngx_http_headers_expires, |
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85 NGX_HTTP_LOC_CONF_OFFSET, |
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86 0, |
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87 NULL}, |
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88 |
573 | 89 { ngx_string("add_header"), |
90 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF | |
91 |NGX_CONF_TAKE2, | |
92 ngx_http_headers_add, | |
93 NGX_HTTP_LOC_CONF_OFFSET, | |
94 0, | |
95 NULL}, | |
96 | |
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97 ngx_null_command |
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98 }; |
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99 |
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100 |
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101 static ngx_http_module_t ngx_http_headers_filter_module_ctx = { |
509 | 102 NULL, /* preconfiguration */ |
681 | 103 ngx_http_headers_filter_init, /* postconfiguration */ |
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104 |
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105 NULL, /* create main configuration */ |
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106 NULL, /* init main configuration */ |
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107 |
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108 NULL, /* create server configuration */ |
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109 NULL, /* merge server configuration */ |
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110 |
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111 ngx_http_headers_create_conf, /* create location configuration */ |
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112 ngx_http_headers_merge_conf /* merge location configuration */ |
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113 }; |
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114 |
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115 |
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116 ngx_module_t ngx_http_headers_filter_module = { |
509 | 117 NGX_MODULE_V1, |
326
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118 &ngx_http_headers_filter_module_ctx, /* module context */ |
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119 ngx_http_headers_filter_commands, /* module directives */ |
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120 NGX_HTTP_MODULE, /* module type */ |
541 | 121 NULL, /* init master */ |
681 | 122 NULL, /* init module */ |
541 | 123 NULL, /* init process */ |
124 NULL, /* init thread */ | |
125 NULL, /* exit thread */ | |
126 NULL, /* exit process */ | |
127 NULL, /* exit master */ | |
128 NGX_MODULE_V1_PADDING | |
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129 }; |
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130 |
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131 |
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132 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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133 |
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134 |
501 | 135 static ngx_int_t |
136 ngx_http_headers_filter(ngx_http_request_t *r) | |
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137 { |
1364 | 138 ngx_str_t value; |
509 | 139 ngx_uint_t i; |
625 | 140 ngx_http_header_val_t *h; |
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141 ngx_http_headers_conf_t *conf; |
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142 |
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143 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module); |
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144 |
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145 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL) |
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146 || r != r->main |
663 | 147 || (r->headers_out.status != NGX_HTTP_OK |
148 && r->headers_out.status != NGX_HTTP_NO_CONTENT | |
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149 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT |
663 | 150 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY |
151 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY | |
4491
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152 && r->headers_out.status != NGX_HTTP_SEE_OTHER |
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153 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED |
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154 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT)) |
543 | 155 { |
326
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156 return ngx_http_next_header_filter(r); |
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157 } |
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158 |
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159 if (conf->expires != NGX_HTTP_EXPIRES_OFF) { |
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160 if (ngx_http_set_expires(r, conf) != NGX_OK) { |
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161 return NGX_ERROR; |
326
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162 } |
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163 } |
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164 |
573 | 165 if (conf->headers) { |
166 h = conf->headers->elts; | |
167 for (i = 0; i < conf->headers->nelts; i++) { | |
625 | 168 |
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169 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) { |
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170 return NGX_ERROR; |
625 | 171 } |
172 | |
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173 if (h[i].handler(r, &h[i], &value) != NGX_OK) { |
625 | 174 return NGX_ERROR; |
175 } | |
573 | 176 } |
177 } | |
178 | |
326
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179 return ngx_http_next_header_filter(r); |
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180 } |
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181 |
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182 |
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183 static ngx_int_t |
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184 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf) |
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185 { |
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186 size_t len; |
2163 | 187 time_t now, expires_time, max_age; |
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188 ngx_uint_t i; |
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189 ngx_table_elt_t *expires, *cc, **ccp; |
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190 |
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191 expires = r->headers_out.expires; |
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192 |
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193 if (expires == NULL) { |
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194 |
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195 expires = ngx_list_push(&r->headers_out.headers); |
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196 if (expires == NULL) { |
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197 return NGX_ERROR; |
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198 } |
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199 |
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200 r->headers_out.expires = expires; |
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201 |
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202 expires->hash = 1; |
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203 ngx_str_set(&expires->key, "Expires"); |
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204 } |
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205 |
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206 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); |
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207 expires->value.len = len - 1; |
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208 |
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209 ccp = r->headers_out.cache_control.elts; |
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210 |
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211 if (ccp == NULL) { |
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212 |
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213 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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214 1, sizeof(ngx_table_elt_t *)) |
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215 != NGX_OK) |
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216 { |
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217 return NGX_ERROR; |
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218 } |
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219 |
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220 ccp = ngx_array_push(&r->headers_out.cache_control); |
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221 if (ccp == NULL) { |
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222 return NGX_ERROR; |
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223 } |
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224 |
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225 cc = ngx_list_push(&r->headers_out.headers); |
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226 if (cc == NULL) { |
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227 return NGX_ERROR; |
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228 } |
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229 |
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230 cc->hash = 1; |
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231 ngx_str_set(&cc->key, "Cache-Control"); |
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232 *ccp = cc; |
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233 |
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234 } else { |
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235 for (i = 1; i < r->headers_out.cache_control.nelts; i++) { |
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236 ccp[i]->hash = 0; |
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237 } |
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238 |
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239 cc = ccp[0]; |
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240 } |
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241 |
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242 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) { |
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243 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT"; |
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244 ngx_str_set(&cc->value, "no-cache"); |
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245 return NGX_OK; |
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246 } |
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247 |
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248 if (conf->expires == NGX_HTTP_EXPIRES_MAX) { |
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249 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT"; |
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250 /* 10 years */ |
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251 ngx_str_set(&cc->value, "max-age=315360000"); |
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252 return NGX_OK; |
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253 } |
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254 |
2049 | 255 expires->value.data = ngx_pnalloc(r->pool, len); |
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256 if (expires->value.data == NULL) { |
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257 return NGX_ERROR; |
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258 } |
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259 |
4216 | 260 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) { |
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261 ngx_memcpy(expires->value.data, ngx_cached_http_time.data, |
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262 ngx_cached_http_time.len + 1); |
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263 ngx_str_set(&cc->value, "max-age=0"); |
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264 return NGX_OK; |
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265 } |
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266 |
2163 | 267 now = ngx_time(); |
268 | |
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269 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) { |
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270 expires_time = ngx_next_time(conf->expires_time); |
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271 max_age = expires_time - now; |
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272 |
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273 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS |
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274 || r->headers_out.last_modified_time == -1) |
2013 | 275 { |
2163 | 276 expires_time = now + conf->expires_time; |
277 max_age = conf->expires_time; | |
278 | |
2013 | 279 } else { |
2163 | 280 expires_time = r->headers_out.last_modified_time + conf->expires_time; |
281 max_age = expires_time - now; | |
2013 | 282 } |
283 | |
2163 | 284 ngx_http_time(expires->value.data, expires_time); |
2013 | 285 |
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286 if (conf->expires_time < 0 || max_age < 0) { |
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287 ngx_str_set(&cc->value, "no-cache"); |
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288 return NGX_OK; |
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289 } |
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290 |
2049 | 291 cc->value.data = ngx_pnalloc(r->pool, |
292 sizeof("max-age=") + NGX_TIME_T_LEN + 1); | |
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293 if (cc->value.data == NULL) { |
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294 return NGX_ERROR; |
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295 } |
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296 |
2163 | 297 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age) |
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298 - cc->value.data; |
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299 |
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300 return NGX_OK; |
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301 } |
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302 |
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303 |
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304 static ngx_int_t |
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305 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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306 ngx_str_t *value) |
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307 { |
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308 ngx_table_elt_t *h; |
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309 |
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310 if (value->len) { |
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311 h = ngx_list_push(&r->headers_out.headers); |
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312 if (h == NULL) { |
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313 return NGX_ERROR; |
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314 } |
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315 |
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316 h->hash = hv->hash; |
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317 h->key = hv->key; |
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318 h->value = *value; |
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319 } |
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320 |
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321 return NGX_OK; |
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322 } |
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323 |
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324 |
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325 static ngx_int_t |
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326 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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327 ngx_str_t *value) |
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328 { |
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329 ngx_table_elt_t *cc, **ccp; |
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330 |
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331 ccp = r->headers_out.cache_control.elts; |
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332 |
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333 if (ccp == NULL) { |
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334 |
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335 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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336 1, sizeof(ngx_table_elt_t *)) |
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337 != NGX_OK) |
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338 { |
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339 return NGX_ERROR; |
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340 } |
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341 } |
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342 |
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343 ccp = ngx_array_push(&r->headers_out.cache_control); |
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344 if (ccp == NULL) { |
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345 return NGX_ERROR; |
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346 } |
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347 |
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348 cc = ngx_list_push(&r->headers_out.headers); |
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349 if (cc == NULL) { |
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350 return NGX_ERROR; |
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351 } |
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352 |
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353 cc->hash = 1; |
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354 ngx_str_set(&cc->key, "Cache-Control"); |
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355 cc->value = *value; |
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356 |
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357 *ccp = cc; |
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358 |
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359 return NGX_OK; |
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360 } |
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361 |
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362 |
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363 static ngx_int_t |
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364 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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365 ngx_str_t *value) |
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366 { |
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367 ngx_table_elt_t *h, **old; |
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368 |
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369 if (hv->offset) { |
1364 | 370 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset); |
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371 |
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372 } else { |
1364 | 373 old = NULL; |
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374 } |
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375 |
1655 | 376 r->headers_out.last_modified_time = -1; |
377 | |
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378 if (old == NULL || *old == NULL) { |
1655 | 379 |
380 if (value->len == 0) { | |
381 return NGX_OK; | |
382 } | |
383 | |
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384 h = ngx_list_push(&r->headers_out.headers); |
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385 if (h == NULL) { |
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386 return NGX_ERROR; |
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387 } |
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388 |
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389 } else { |
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390 h = *old; |
1655 | 391 |
392 if (value->len == 0) { | |
393 h->hash = 0; | |
394 return NGX_OK; | |
395 } | |
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396 } |
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397 |
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398 h->hash = hv->hash; |
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399 h->key = hv->key; |
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400 h->value = *value; |
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401 |
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402 return NGX_OK; |
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403 } |
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404 |
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405 |
501 | 406 static void * |
407 ngx_http_headers_create_conf(ngx_conf_t *cf) | |
577 | 408 { |
326
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409 ngx_http_headers_conf_t *conf; |
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410 |
573 | 411 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t)); |
501 | 412 if (conf == NULL) { |
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413 return NULL; |
326
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414 } |
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415 |
573 | 416 /* |
417 * set by ngx_pcalloc(): | |
418 * | |
419 * conf->headers = NULL; | |
2013 | 420 * conf->expires_time = 0; |
573 | 421 */ |
422 | |
2013 | 423 conf->expires = NGX_CONF_UNSET_UINT; |
326
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424 |
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425 return conf; |
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426 } |
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427 |
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428 |
501 | 429 static char * |
430 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
326
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431 { |
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432 ngx_http_headers_conf_t *prev = parent; |
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433 ngx_http_headers_conf_t *conf = child; |
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434 |
2013 | 435 if (conf->expires == NGX_CONF_UNSET_UINT) { |
436 conf->expires = prev->expires; | |
437 conf->expires_time = prev->expires_time; | |
438 | |
439 if (conf->expires == NGX_CONF_UNSET_UINT) { | |
440 conf->expires = NGX_HTTP_EXPIRES_OFF; | |
441 } | |
326
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442 } |
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443 |
573 | 444 if (conf->headers == NULL) { |
445 conf->headers = prev->headers; | |
446 } | |
447 | |
326
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448 return NGX_CONF_OK; |
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449 } |
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450 |
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451 |
681 | 452 static ngx_int_t |
453 ngx_http_headers_filter_init(ngx_conf_t *cf) | |
454 { | |
455 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
456 ngx_http_top_header_filter = ngx_http_headers_filter; | |
457 | |
458 return NGX_OK; | |
459 } | |
460 | |
461 | |
501 | 462 static char * |
463 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
326
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464 { |
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465 ngx_http_headers_conf_t *hcf = conf; |
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466 |
2013 | 467 ngx_uint_t minus, n; |
326
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468 ngx_str_t *value; |
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469 |
2013 | 470 if (hcf->expires != NGX_CONF_UNSET_UINT) { |
326
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471 return "is duplicate"; |
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472 } |
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473 |
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474 value = cf->args->elts; |
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475 |
2013 | 476 if (cf->args->nelts == 2) { |
477 | |
478 if (ngx_strcmp(value[1].data, "epoch") == 0) { | |
479 hcf->expires = NGX_HTTP_EXPIRES_EPOCH; | |
480 return NGX_CONF_OK; | |
481 } | |
482 | |
483 if (ngx_strcmp(value[1].data, "max") == 0) { | |
484 hcf->expires = NGX_HTTP_EXPIRES_MAX; | |
485 return NGX_CONF_OK; | |
486 } | |
326
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487 |
2013 | 488 if (ngx_strcmp(value[1].data, "off") == 0) { |
489 hcf->expires = NGX_HTTP_EXPIRES_OFF; | |
490 return NGX_CONF_OK; | |
491 } | |
492 | |
493 hcf->expires = NGX_HTTP_EXPIRES_ACCESS; | |
494 | |
495 n = 1; | |
496 | |
497 } else { /* cf->args->nelts == 3 */ | |
498 | |
499 if (ngx_strcmp(value[1].data, "modified") != 0) { | |
500 return "invalid value"; | |
501 } | |
502 | |
503 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED; | |
504 | |
505 n = 2; | |
729 | 506 } |
507 | |
2163 | 508 if (value[n].data[0] == '@') { |
509 value[n].data++; | |
510 value[n].len--; | |
511 minus = 0; | |
512 | |
513 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) { | |
4133
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514 return "daily time cannot be used with \"modified\" parameter"; |
2163 | 515 } |
516 | |
517 hcf->expires = NGX_HTTP_EXPIRES_DAILY; | |
518 | |
519 } else if (value[n].data[0] == '+') { | |
2013 | 520 value[n].data++; |
521 value[n].len--; | |
326
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522 minus = 0; |
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523 |
2013 | 524 } else if (value[n].data[0] == '-') { |
525 value[n].data++; | |
526 value[n].len--; | |
326
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527 minus = 1; |
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528 |
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529 } else { |
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530 minus = 0; |
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531 } |
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532 |
2013 | 533 hcf->expires_time = ngx_parse_time(&value[n], 1); |
501 | 534 |
4474 | 535 if (hcf->expires_time == (time_t) NGX_ERROR) { |
326
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536 return "invalid value"; |
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537 } |
577 | 538 |
2164 | 539 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY |
540 && hcf->expires_time > 24 * 60 * 60) | |
541 { | |
542 return "daily time value must be less than 24 hours"; | |
543 } | |
544 | |
326
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545 if (minus) { |
2013 | 546 hcf->expires_time = - hcf->expires_time; |
326
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547 } |
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548 |
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549 return NGX_CONF_OK; |
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550 } |
573 | 551 |
552 | |
553 static char * | |
554 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
555 { | |
556 ngx_http_headers_conf_t *hcf = conf; | |
557 | |
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558 ngx_str_t *value; |
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559 ngx_uint_t i; |
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560 ngx_http_header_val_t *hv; |
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561 ngx_http_set_header_t *set; |
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562 ngx_http_compile_complex_value_t ccv; |
573 | 563 |
564 value = cf->args->elts; | |
565 | |
566 if (hcf->headers == NULL) { | |
625 | 567 hcf->headers = ngx_array_create(cf->pool, 1, |
568 sizeof(ngx_http_header_val_t)); | |
573 | 569 if (hcf->headers == NULL) { |
570 return NGX_CONF_ERROR; | |
571 } | |
572 } | |
573 | |
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574 hv = ngx_array_push(hcf->headers); |
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575 if (hv == NULL) { |
573 | 576 return NGX_CONF_ERROR; |
577 } | |
578 | |
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579 hv->hash = 1; |
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580 hv->key = value[1]; |
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581 hv->handler = ngx_http_add_header; |
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582 hv->offset = 0; |
625 | 583 |
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584 set = ngx_http_set_headers; |
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585 for (i = 0; set[i].name.len; i++) { |
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586 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) { |
1363
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587 continue; |
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588 } |
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|
589 |
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590 hv->offset = set[i].offset; |
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591 hv->handler = set[i].handler; |
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592 |
1363
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593 break; |
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594 } |
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595 |
2605
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596 if (value[2].len == 0) { |
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597 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t)); |
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598 return NGX_CONF_OK; |
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599 } |
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|
600 |
2588
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601 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
625 | 602 |
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603 ccv.cf = cf; |
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604 ccv.value = &value[2]; |
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605 ccv.complex_value = &hv->value; |
625 | 606 |
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607 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
625 | 608 return NGX_CONF_ERROR; |
609 } | |
573 | 610 |
611 return NGX_CONF_OK; | |
612 } |