50
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_http.h>
|
|
10
|
|
11
|
|
12 typedef struct {
|
|
13 time_t expires;
|
|
14 } ngx_http_headers_conf_t;
|
|
15
|
|
16
|
|
17 #define NGX_HTTP_EXPIRES_UNSET -2147483647
|
|
18 #define NGX_HTTP_EXPIRES_OFF -2147483646
|
|
19 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
|
|
20
|
|
21
|
|
22 static ngx_int_t ngx_http_headers_filter_init(ngx_cycle_t *cycle);
|
|
23 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
|
|
24 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
|
|
25 void *parent, void *child);
|
|
26 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
27 void *conf);
|
|
28
|
|
29
|
|
30 static ngx_command_t ngx_http_headers_filter_commands[] = {
|
|
31
|
|
32 { ngx_string("expires"),
|
|
33 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
34 ngx_http_headers_expires,
|
|
35 NGX_HTTP_LOC_CONF_OFFSET,
|
|
36 0,
|
|
37 NULL},
|
|
38
|
|
39 ngx_null_command
|
|
40 };
|
|
41
|
|
42
|
|
43 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
|
58
|
44 NULL, /* preconfiguration */
|
|
45 NULL, /* postconfiguration */
|
50
|
46
|
|
47 NULL, /* create main configuration */
|
|
48 NULL, /* init main configuration */
|
|
49
|
|
50 NULL, /* create server configuration */
|
|
51 NULL, /* merge server configuration */
|
|
52
|
|
53 ngx_http_headers_create_conf, /* create location configuration */
|
|
54 ngx_http_headers_merge_conf /* merge location configuration */
|
|
55 };
|
|
56
|
|
57
|
|
58 ngx_module_t ngx_http_headers_filter_module = {
|
58
|
59 NGX_MODULE_V1,
|
50
|
60 &ngx_http_headers_filter_module_ctx, /* module context */
|
|
61 ngx_http_headers_filter_commands, /* module directives */
|
|
62 NGX_HTTP_MODULE, /* module type */
|
90
|
63 NULL, /* init master */
|
50
|
64 ngx_http_headers_filter_init, /* init module */
|
90
|
65 NULL, /* init process */
|
|
66 NULL, /* init thread */
|
|
67 NULL, /* exit thread */
|
|
68 NULL, /* exit process */
|
|
69 NULL, /* exit master */
|
|
70 NGX_MODULE_V1_PADDING
|
50
|
71 };
|
|
72
|
|
73
|
|
74 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
|
|
75
|
|
76
|
|
77 static ngx_int_t
|
|
78 ngx_http_headers_filter(ngx_http_request_t *r)
|
|
79 {
|
|
80 size_t len;
|
58
|
81 ngx_uint_t i;
|
86
|
82 ngx_table_elt_t *expires, *cc, **ccp;
|
50
|
83 ngx_http_headers_conf_t *conf;
|
|
84
|
58
|
85 if (r->headers_out.status != NGX_HTTP_OK || r->main) {
|
50
|
86 return ngx_http_next_header_filter(r);
|
|
87 }
|
|
88
|
|
89 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
|
|
90
|
|
91 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
|
|
92
|
58
|
93 expires = r->headers_out.expires;
|
|
94
|
50
|
95 if (expires == NULL) {
|
58
|
96
|
|
97 expires = ngx_list_push(&r->headers_out.headers);
|
|
98 if (expires == NULL) {
|
|
99 return NGX_ERROR;
|
|
100 }
|
|
101
|
|
102 r->headers_out.expires = expires;
|
|
103
|
|
104 expires->hash = 1;
|
|
105 expires->key.len = sizeof("Expires") - 1;
|
|
106 expires->key.data = (u_char *) "Expires";
|
50
|
107 }
|
|
108
|
|
109 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
|
|
110 expires->value.len = len - 1;
|
|
111
|
86
|
112 ccp = r->headers_out.cache_control.elts;
|
|
113
|
|
114 if (ccp == NULL) {
|
58
|
115
|
86
|
116 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
|
|
117 1, sizeof(ngx_table_elt_t *)) != NGX_OK)
|
|
118 {
|
|
119 return NGX_ERROR;
|
|
120 }
|
|
121
|
|
122 ccp = ngx_array_push(&r->headers_out.cache_control);
|
|
123 if (ccp == NULL) {
|
|
124 return NGX_ERROR;
|
|
125 }
|
58
|
126
|
|
127 cc = ngx_list_push(&r->headers_out.headers);
|
|
128 if (cc == NULL) {
|
|
129 return NGX_ERROR;
|
|
130 }
|
|
131
|
|
132 cc->hash = 1;
|
|
133 cc->key.len = sizeof("Cache-Control") - 1;
|
|
134 cc->key.data = (u_char *) "Cache-Control";
|
|
135
|
86
|
136 *ccp = cc;
|
|
137
|
58
|
138 } else {
|
|
139 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
|
86
|
140 ccp[i]->hash = 0;
|
58
|
141 }
|
86
|
142
|
|
143 cc = ccp[0];
|
58
|
144 }
|
50
|
145
|
|
146 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
|
|
147 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
|
|
148
|
|
149 cc->value.len = sizeof("no-cache") - 1;
|
|
150 cc->value.data = (u_char *) "no-cache";
|
|
151
|
|
152 } else {
|
|
153 expires->value.data = ngx_palloc(r->pool, len);
|
|
154 if (expires->value.data == NULL) {
|
|
155 return NGX_ERROR;
|
|
156 }
|
|
157
|
|
158 if (conf->expires == 0) {
|
|
159 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
|
|
160 ngx_cached_http_time.len + 1);
|
|
161
|
|
162 cc->value.len = sizeof("max-age=0") - 1;
|
|
163 cc->value.data = (u_char *) "max-age=0";
|
|
164
|
|
165 } else {
|
|
166 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
|
|
167
|
|
168 if (conf->expires < 0) {
|
|
169 cc->value.len = sizeof("no-cache") - 1;
|
|
170 cc->value.data = (u_char *) "no-cache";
|
|
171
|
|
172 } else {
|
|
173 cc->value.data = ngx_palloc(r->pool, sizeof("max-age=")
|
|
174 + NGX_TIME_T_LEN + 1);
|
|
175 if (cc->value.data == NULL) {
|
|
176 return NGX_ERROR;
|
|
177 }
|
|
178
|
|
179 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
|
|
180 conf->expires)
|
|
181 - cc->value.data;
|
|
182
|
|
183 }
|
|
184 }
|
|
185 }
|
|
186 }
|
|
187
|
|
188 return ngx_http_next_header_filter(r);
|
|
189 }
|
|
190
|
|
191
|
|
192 static ngx_int_t
|
|
193 ngx_http_headers_filter_init(ngx_cycle_t *cycle)
|
|
194 {
|
|
195 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
196 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
197
|
|
198 return NGX_OK;
|
|
199 }
|
|
200
|
|
201
|
|
202 static void *
|
|
203 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
204 {
|
|
205 ngx_http_headers_conf_t *conf;
|
|
206
|
|
207 conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
208 if (conf == NULL) {
|
|
209 return NGX_CONF_ERROR;
|
|
210 }
|
|
211
|
|
212 conf->expires = NGX_HTTP_EXPIRES_UNSET;
|
|
213
|
|
214 return conf;
|
|
215 }
|
|
216
|
|
217
|
|
218 static char *
|
|
219 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
220 {
|
|
221 ngx_http_headers_conf_t *prev = parent;
|
|
222 ngx_http_headers_conf_t *conf = child;
|
|
223
|
|
224 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
225 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
|
|
226 NGX_HTTP_EXPIRES_OFF : prev->expires;
|
|
227 }
|
|
228
|
|
229 return NGX_CONF_OK;
|
|
230 }
|
|
231
|
|
232
|
|
233 static char *
|
|
234 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
235 {
|
|
236 ngx_http_headers_conf_t *hcf = conf;
|
|
237
|
|
238 ngx_uint_t minus;
|
|
239 ngx_str_t *value;
|
|
240
|
|
241 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
|
|
242 return "is duplicate";
|
|
243 }
|
|
244
|
|
245 value = cf->args->elts;
|
|
246
|
|
247 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
248 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
249 return NGX_CONF_OK;
|
|
250 }
|
|
251
|
|
252 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
253 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
254 return NGX_CONF_OK;
|
|
255 }
|
|
256
|
|
257 if (value[1].data[0] == '+') {
|
|
258 value[1].data++;
|
|
259 value[1].len--;
|
|
260 minus = 0;
|
|
261
|
|
262 } else if (value[1].data[0] == '-') {
|
|
263 value[1].data++;
|
|
264 value[1].len--;
|
|
265 minus = 1;
|
|
266
|
|
267 } else {
|
|
268 minus = 0;
|
|
269 }
|
|
270
|
|
271 hcf->expires = ngx_parse_time(&value[1], 1);
|
|
272
|
|
273 if (hcf->expires == NGX_ERROR) {
|
|
274 return "invalid value";
|
|
275 }
|
|
276
|
|
277 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
|
|
278 return "value must be less than 68 years";
|
|
279 }
|
|
280
|
|
281 if (minus) {
|
|
282 hcf->expires = - hcf->expires;
|
|
283 }
|
|
284
|
|
285 return NGX_CONF_OK;
|
|
286 }
|