Mercurial > hg > nginx
annotate src/http/modules/ngx_http_headers_filter_module.c @ 4547:2577c27cbffd
Minor ngx_http_headers_filter_module.c code cleanup.
- Removed "hash" element from ngx_http_header_val_t which was always 1.
- Replaced NGX_HTTP_EXPIRES_* with ngx_http_expires_t enum type.
- Added prototype for ngx_http_add_header()
- Simplified ngx_http_set_last_modified().
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Wed, 21 Mar 2012 06:19:11 +0000 |
parents | d11f86a16e3b |
children | 4c1e6cef1453 |
rev | line source |
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441
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1 |
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2 /* |
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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_str_t key; |
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29 ngx_http_set_header_pt handler; |
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30 ngx_uint_t offset; |
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31 }; |
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32 |
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33 |
4547
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34 typedef enum { |
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35 NGX_HTTP_EXPIRES_OFF, |
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36 NGX_HTTP_EXPIRES_EPOCH, |
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37 NGX_HTTP_EXPIRES_MAX, |
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38 NGX_HTTP_EXPIRES_ACCESS, |
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39 NGX_HTTP_EXPIRES_MODIFIED, |
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40 NGX_HTTP_EXPIRES_DAILY, |
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41 NGX_HTTP_EXPIRES_UNSET |
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42 } ngx_http_expires_t; |
2013 | 43 |
44 | |
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45 typedef struct { |
4547
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46 ngx_http_expires_t expires; |
2013 | 47 time_t expires_time; |
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48 ngx_array_t *headers; |
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49 } ngx_http_headers_conf_t; |
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50 |
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51 |
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52 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r, |
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53 ngx_http_headers_conf_t *conf); |
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54 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r, |
1363
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55 ngx_http_header_val_t *hv, ngx_str_t *value); |
4547
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56 static ngx_int_t ngx_http_add_header(ngx_http_request_t *r, |
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57 ngx_http_header_val_t *hv, ngx_str_t *value); |
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58 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r, |
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59 ngx_http_header_val_t *hv, ngx_str_t *value); |
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60 |
326
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61 static void *ngx_http_headers_create_conf(ngx_conf_t *cf); |
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62 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf, |
573 | 63 void *parent, void *child); |
681 | 64 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf); |
501 | 65 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, |
66 void *conf); | |
573 | 67 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, |
68 void *conf); | |
326
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69 |
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70 |
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71 static ngx_http_set_header_t ngx_http_set_headers[] = { |
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72 |
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73 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control }, |
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74 |
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75 { ngx_string("Last-Modified"), |
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76 offsetof(ngx_http_headers_out_t, last_modified), |
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77 ngx_http_set_last_modified }, |
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78 |
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79 { ngx_null_string, 0, NULL } |
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80 }; |
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81 |
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82 |
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83 static ngx_command_t ngx_http_headers_filter_commands[] = { |
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84 |
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85 { ngx_string("expires"), |
573 | 86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |
2013 | 87 |NGX_CONF_TAKE12, |
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88 ngx_http_headers_expires, |
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89 NGX_HTTP_LOC_CONF_OFFSET, |
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90 0, |
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91 NULL}, |
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92 |
573 | 93 { ngx_string("add_header"), |
94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF | |
95 |NGX_CONF_TAKE2, | |
96 ngx_http_headers_add, | |
97 NGX_HTTP_LOC_CONF_OFFSET, | |
98 0, | |
99 NULL}, | |
100 | |
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101 ngx_null_command |
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102 }; |
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103 |
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104 |
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105 static ngx_http_module_t ngx_http_headers_filter_module_ctx = { |
509 | 106 NULL, /* preconfiguration */ |
681 | 107 ngx_http_headers_filter_init, /* postconfiguration */ |
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108 |
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109 NULL, /* create main configuration */ |
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110 NULL, /* init main configuration */ |
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111 |
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112 NULL, /* create server configuration */ |
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113 NULL, /* merge server configuration */ |
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114 |
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115 ngx_http_headers_create_conf, /* create location configuration */ |
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116 ngx_http_headers_merge_conf /* merge location configuration */ |
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117 }; |
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118 |
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119 |
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120 ngx_module_t ngx_http_headers_filter_module = { |
509 | 121 NGX_MODULE_V1, |
326
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122 &ngx_http_headers_filter_module_ctx, /* module context */ |
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123 ngx_http_headers_filter_commands, /* module directives */ |
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124 NGX_HTTP_MODULE, /* module type */ |
541 | 125 NULL, /* init master */ |
681 | 126 NULL, /* init module */ |
541 | 127 NULL, /* init process */ |
128 NULL, /* init thread */ | |
129 NULL, /* exit thread */ | |
130 NULL, /* exit process */ | |
131 NULL, /* exit master */ | |
132 NGX_MODULE_V1_PADDING | |
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133 }; |
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134 |
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135 |
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136 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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137 |
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138 |
501 | 139 static ngx_int_t |
140 ngx_http_headers_filter(ngx_http_request_t *r) | |
326
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141 { |
1364 | 142 ngx_str_t value; |
509 | 143 ngx_uint_t i; |
625 | 144 ngx_http_header_val_t *h; |
326
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145 ngx_http_headers_conf_t *conf; |
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146 |
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147 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module); |
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148 |
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149 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL) |
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150 || r != r->main |
663 | 151 || (r->headers_out.status != NGX_HTTP_OK |
152 && r->headers_out.status != NGX_HTTP_NO_CONTENT | |
4314
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Allowed add_header for proxied 206 replies.
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153 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT |
663 | 154 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY |
155 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY | |
4491
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156 && r->headers_out.status != NGX_HTTP_SEE_OTHER |
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157 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED |
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158 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT)) |
543 | 159 { |
326
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160 return ngx_http_next_header_filter(r); |
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161 } |
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162 |
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163 if (conf->expires != NGX_HTTP_EXPIRES_OFF) { |
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164 if (ngx_http_set_expires(r, conf) != NGX_OK) { |
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165 return NGX_ERROR; |
326
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166 } |
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167 } |
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168 |
573 | 169 if (conf->headers) { |
170 h = conf->headers->elts; | |
171 for (i = 0; i < conf->headers->nelts; i++) { | |
625 | 172 |
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173 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) { |
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174 return NGX_ERROR; |
625 | 175 } |
176 | |
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177 if (h[i].handler(r, &h[i], &value) != NGX_OK) { |
625 | 178 return NGX_ERROR; |
179 } | |
573 | 180 } |
181 } | |
182 | |
326
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183 return ngx_http_next_header_filter(r); |
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184 } |
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185 |
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186 |
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187 static ngx_int_t |
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188 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf) |
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189 { |
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190 size_t len; |
2163 | 191 time_t now, expires_time, max_age; |
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192 ngx_uint_t i; |
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193 ngx_table_elt_t *expires, *cc, **ccp; |
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194 |
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195 expires = r->headers_out.expires; |
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196 |
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197 if (expires == NULL) { |
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198 |
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199 expires = ngx_list_push(&r->headers_out.headers); |
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200 if (expires == NULL) { |
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201 return NGX_ERROR; |
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202 } |
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203 |
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204 r->headers_out.expires = expires; |
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205 |
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206 expires->hash = 1; |
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207 ngx_str_set(&expires->key, "Expires"); |
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208 } |
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209 |
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210 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); |
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211 expires->value.len = len - 1; |
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212 |
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213 ccp = r->headers_out.cache_control.elts; |
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214 |
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215 if (ccp == NULL) { |
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216 |
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217 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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218 1, sizeof(ngx_table_elt_t *)) |
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219 != NGX_OK) |
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220 { |
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221 return NGX_ERROR; |
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222 } |
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223 |
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224 ccp = ngx_array_push(&r->headers_out.cache_control); |
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225 if (ccp == NULL) { |
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226 return NGX_ERROR; |
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227 } |
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228 |
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229 cc = ngx_list_push(&r->headers_out.headers); |
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230 if (cc == NULL) { |
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231 return NGX_ERROR; |
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232 } |
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233 |
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234 cc->hash = 1; |
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235 ngx_str_set(&cc->key, "Cache-Control"); |
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236 *ccp = cc; |
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237 |
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238 } else { |
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239 for (i = 1; i < r->headers_out.cache_control.nelts; i++) { |
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240 ccp[i]->hash = 0; |
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241 } |
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242 |
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243 cc = ccp[0]; |
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244 } |
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245 |
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246 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) { |
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247 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT"; |
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248 ngx_str_set(&cc->value, "no-cache"); |
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249 return NGX_OK; |
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250 } |
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251 |
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252 if (conf->expires == NGX_HTTP_EXPIRES_MAX) { |
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253 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT"; |
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254 /* 10 years */ |
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255 ngx_str_set(&cc->value, "max-age=315360000"); |
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256 return NGX_OK; |
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257 } |
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258 |
2049 | 259 expires->value.data = ngx_pnalloc(r->pool, len); |
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260 if (expires->value.data == NULL) { |
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261 return NGX_ERROR; |
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262 } |
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263 |
4216 | 264 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) { |
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265 ngx_memcpy(expires->value.data, ngx_cached_http_time.data, |
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266 ngx_cached_http_time.len + 1); |
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267 ngx_str_set(&cc->value, "max-age=0"); |
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268 return NGX_OK; |
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269 } |
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270 |
2163 | 271 now = ngx_time(); |
272 | |
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273 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) { |
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274 expires_time = ngx_next_time(conf->expires_time); |
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275 max_age = expires_time - now; |
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276 |
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277 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS |
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278 || r->headers_out.last_modified_time == -1) |
2013 | 279 { |
2163 | 280 expires_time = now + conf->expires_time; |
281 max_age = conf->expires_time; | |
282 | |
2013 | 283 } else { |
2163 | 284 expires_time = r->headers_out.last_modified_time + conf->expires_time; |
285 max_age = expires_time - now; | |
2013 | 286 } |
287 | |
2163 | 288 ngx_http_time(expires->value.data, expires_time); |
2013 | 289 |
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290 if (conf->expires_time < 0 || max_age < 0) { |
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291 ngx_str_set(&cc->value, "no-cache"); |
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292 return NGX_OK; |
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293 } |
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294 |
2049 | 295 cc->value.data = ngx_pnalloc(r->pool, |
296 sizeof("max-age=") + NGX_TIME_T_LEN + 1); | |
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297 if (cc->value.data == NULL) { |
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298 return NGX_ERROR; |
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299 } |
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300 |
2163 | 301 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age) |
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302 - cc->value.data; |
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303 |
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304 return NGX_OK; |
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305 } |
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306 |
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307 |
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308 static ngx_int_t |
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309 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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310 ngx_str_t *value) |
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311 { |
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312 ngx_table_elt_t *h; |
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313 |
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314 if (value->len) { |
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315 h = ngx_list_push(&r->headers_out.headers); |
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316 if (h == NULL) { |
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317 return NGX_ERROR; |
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318 } |
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319 |
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320 h->hash = 1; |
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321 h->key = hv->key; |
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322 h->value = *value; |
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323 } |
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324 |
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325 return NGX_OK; |
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326 } |
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327 |
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328 |
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329 static ngx_int_t |
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330 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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331 ngx_str_t *value) |
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332 { |
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333 ngx_table_elt_t *cc, **ccp; |
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334 |
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335 ccp = r->headers_out.cache_control.elts; |
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336 |
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337 if (ccp == NULL) { |
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338 |
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339 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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340 1, sizeof(ngx_table_elt_t *)) |
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341 != NGX_OK) |
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342 { |
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343 return NGX_ERROR; |
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344 } |
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345 } |
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346 |
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347 ccp = ngx_array_push(&r->headers_out.cache_control); |
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348 if (ccp == NULL) { |
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349 return NGX_ERROR; |
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350 } |
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351 |
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352 cc = ngx_list_push(&r->headers_out.headers); |
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353 if (cc == NULL) { |
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354 return NGX_ERROR; |
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355 } |
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356 |
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357 cc->hash = 1; |
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358 ngx_str_set(&cc->key, "Cache-Control"); |
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359 cc->value = *value; |
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360 |
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361 *ccp = cc; |
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362 |
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363 return NGX_OK; |
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364 } |
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365 |
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366 |
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367 static ngx_int_t |
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368 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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369 ngx_str_t *value) |
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370 { |
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371 ngx_table_elt_t *h, **old; |
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372 |
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373 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset); |
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374 |
1655 | 375 r->headers_out.last_modified_time = -1; |
376 | |
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377 if (*old == NULL) { |
1655 | 378 |
379 if (value->len == 0) { | |
380 return NGX_OK; | |
381 } | |
382 | |
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383 h = ngx_list_push(&r->headers_out.headers); |
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384 if (h == NULL) { |
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385 return NGX_ERROR; |
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386 } |
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387 |
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388 } else { |
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389 h = *old; |
1655 | 390 |
391 if (value->len == 0) { | |
392 h->hash = 0; | |
393 return NGX_OK; | |
394 } | |
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395 } |
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396 |
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397 h->hash = 1; |
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398 h->key = hv->key; |
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399 h->value = *value; |
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400 |
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401 return NGX_OK; |
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402 } |
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403 |
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404 |
501 | 405 static void * |
406 ngx_http_headers_create_conf(ngx_conf_t *cf) | |
577 | 407 { |
326
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408 ngx_http_headers_conf_t *conf; |
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409 |
573 | 410 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t)); |
501 | 411 if (conf == NULL) { |
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412 return NULL; |
326
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413 } |
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414 |
573 | 415 /* |
416 * set by ngx_pcalloc(): | |
417 * | |
418 * conf->headers = NULL; | |
2013 | 419 * conf->expires_time = 0; |
573 | 420 */ |
421 | |
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422 conf->expires = NGX_HTTP_EXPIRES_UNSET; |
326
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423 |
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424 return conf; |
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425 } |
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426 |
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427 |
501 | 428 static char * |
429 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
326
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430 { |
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431 ngx_http_headers_conf_t *prev = parent; |
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432 ngx_http_headers_conf_t *conf = child; |
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433 |
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Minor ngx_http_headers_filter_module.c code cleanup.
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434 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) { |
2013 | 435 conf->expires = prev->expires; |
436 conf->expires_time = prev->expires_time; | |
437 | |
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438 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) { |
2013 | 439 conf->expires = NGX_HTTP_EXPIRES_OFF; |
440 } | |
326
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441 } |
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442 |
573 | 443 if (conf->headers == NULL) { |
444 conf->headers = prev->headers; | |
445 } | |
446 | |
326
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447 return NGX_CONF_OK; |
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448 } |
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449 |
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450 |
681 | 451 static ngx_int_t |
452 ngx_http_headers_filter_init(ngx_conf_t *cf) | |
453 { | |
454 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
455 ngx_http_top_header_filter = ngx_http_headers_filter; | |
456 | |
457 return NGX_OK; | |
458 } | |
459 | |
460 | |
501 | 461 static char * |
462 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
326
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463 { |
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464 ngx_http_headers_conf_t *hcf = conf; |
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465 |
2013 | 466 ngx_uint_t minus, n; |
326
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467 ngx_str_t *value; |
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468 |
4547
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Minor ngx_http_headers_filter_module.c code cleanup.
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469 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) { |
326
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470 return "is duplicate"; |
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471 } |
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472 |
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473 value = cf->args->elts; |
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474 |
2013 | 475 if (cf->args->nelts == 2) { |
476 | |
477 if (ngx_strcmp(value[1].data, "epoch") == 0) { | |
478 hcf->expires = NGX_HTTP_EXPIRES_EPOCH; | |
479 return NGX_CONF_OK; | |
480 } | |
481 | |
482 if (ngx_strcmp(value[1].data, "max") == 0) { | |
483 hcf->expires = NGX_HTTP_EXPIRES_MAX; | |
484 return NGX_CONF_OK; | |
485 } | |
326
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486 |
2013 | 487 if (ngx_strcmp(value[1].data, "off") == 0) { |
488 hcf->expires = NGX_HTTP_EXPIRES_OFF; | |
489 return NGX_CONF_OK; | |
490 } | |
491 | |
492 hcf->expires = NGX_HTTP_EXPIRES_ACCESS; | |
493 | |
494 n = 1; | |
495 | |
496 } else { /* cf->args->nelts == 3 */ | |
497 | |
498 if (ngx_strcmp(value[1].data, "modified") != 0) { | |
499 return "invalid value"; | |
500 } | |
501 | |
502 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED; | |
503 | |
504 n = 2; | |
729 | 505 } |
506 | |
2163 | 507 if (value[n].data[0] == '@') { |
508 value[n].data++; | |
509 value[n].len--; | |
510 minus = 0; | |
511 | |
512 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) { | |
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Replaced "can not" with "cannot" and "could not" in a bunch of places.
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|
513 return "daily time cannot be used with \"modified\" parameter"; |
2163 | 514 } |
515 | |
516 hcf->expires = NGX_HTTP_EXPIRES_DAILY; | |
517 | |
518 } else if (value[n].data[0] == '+') { | |
2013 | 519 value[n].data++; |
520 value[n].len--; | |
326
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521 minus = 0; |
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522 |
2013 | 523 } else if (value[n].data[0] == '-') { |
524 value[n].data++; | |
525 value[n].len--; | |
326
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526 minus = 1; |
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527 |
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528 } else { |
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529 minus = 0; |
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530 } |
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531 |
2013 | 532 hcf->expires_time = ngx_parse_time(&value[n], 1); |
501 | 533 |
4474 | 534 if (hcf->expires_time == (time_t) NGX_ERROR) { |
326
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535 return "invalid value"; |
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|
536 } |
577 | 537 |
2164 | 538 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY |
539 && hcf->expires_time > 24 * 60 * 60) | |
540 { | |
541 return "daily time value must be less than 24 hours"; | |
542 } | |
543 | |
326
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|
544 if (minus) { |
2013 | 545 hcf->expires_time = - hcf->expires_time; |
326
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546 } |
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|
547 |
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548 return NGX_CONF_OK; |
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|
549 } |
573 | 550 |
551 | |
552 static char * | |
553 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
554 { | |
555 ngx_http_headers_conf_t *hcf = conf; | |
556 | |
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|
557 ngx_str_t *value; |
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558 ngx_uint_t i; |
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559 ngx_http_header_val_t *hv; |
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560 ngx_http_set_header_t *set; |
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561 ngx_http_compile_complex_value_t ccv; |
573 | 562 |
563 value = cf->args->elts; | |
564 | |
565 if (hcf->headers == NULL) { | |
625 | 566 hcf->headers = ngx_array_create(cf->pool, 1, |
567 sizeof(ngx_http_header_val_t)); | |
573 | 568 if (hcf->headers == NULL) { |
569 return NGX_CONF_ERROR; | |
570 } | |
571 } | |
572 | |
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573 hv = ngx_array_push(hcf->headers); |
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|
574 if (hv == NULL) { |
573 | 575 return NGX_CONF_ERROR; |
576 } | |
577 | |
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578 hv->key = value[1]; |
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579 hv->handler = ngx_http_add_header; |
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580 hv->offset = 0; |
625 | 581 |
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582 set = ngx_http_set_headers; |
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|
583 for (i = 0; set[i].name.len; i++) { |
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584 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) { |
1363
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585 continue; |
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use header specific handler in add_handler,
Igor Sysoev <igor@sysoev.ru>
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|
586 } |
b0e114fb3bdc
use header specific handler in add_handler,
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diff
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|
587 |
2588
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588 hv->offset = set[i].offset; |
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589 hv->handler = set[i].handler; |
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|
590 |
1363
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591 break; |
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|
592 } |
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|
593 |
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|
594 if (value[2].len == 0) { |
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595 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t)); |
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596 return NGX_CONF_OK; |
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597 } |
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|
598 |
2588
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599 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
625 | 600 |
2588
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|
601 ccv.cf = cf; |
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|
602 ccv.value = &value[2]; |
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|
603 ccv.complex_value = &hv->value; |
625 | 604 |
2588
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|
605 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
625 | 606 return NGX_CONF_ERROR; |
607 } | |
573 | 608 |
609 return NGX_CONF_OK; | |
610 } |