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comparison src/http/modules/ngx_http_headers_filter.c @ 326:8733703a37f3

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nginx-0.0.3-2004-04-26-00:13:21 import
author Igor Sysoev <igor@sysoev.ru>
date Sun, 25 Apr 2004 20:13:21 +0000
parents
children 2e3cbc1bbe3c
comparison
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325:7c3323909107 326:8733703a37f3
1
2 #include <ngx_config.h>
3 #include <ngx_core.h>
4 #include <ngx_http.h>
5
6
7 typedef struct {
8 time_t expires;
9 } ngx_http_headers_conf_t;
10
11
12 #define NGX_HTTP_EXPIRES_UNSET -2147483647
13 #define NGX_HTTP_EXPIRES_OFF -2147483646
14 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
15
16
17 static int ngx_http_headers_filter_init(ngx_cycle_t *cycle);
18 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
19 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
20 void *parent, void *child);
21 char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
22
23
24 static ngx_command_t ngx_http_headers_filter_commands[] = {
25
26 { ngx_string("expires"),
27 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
28 ngx_http_headers_expires,
29 NGX_HTTP_LOC_CONF_OFFSET,
30 0,
31 NULL},
32
33 ngx_null_command
34 };
35
36
37 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
38 NULL, /* pre conf */
39
40 NULL, /* create main configuration */
41 NULL, /* init main configuration */
42
43 NULL, /* create server configuration */
44 NULL, /* merge server configuration */
45
46 ngx_http_headers_create_conf, /* create location configuration */
47 ngx_http_headers_merge_conf /* merge location configuration */
48 };
49
50
51 ngx_module_t ngx_http_headers_filter_module = {
52 NGX_MODULE,
53 &ngx_http_headers_filter_module_ctx, /* module context */
54 ngx_http_headers_filter_commands, /* module directives */
55 NGX_HTTP_MODULE, /* module type */
56 ngx_http_headers_filter_init, /* init module */
57 NULL /* init child */
58 };
59
60
61 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
62
63
64 static int ngx_http_headers_filter(ngx_http_request_t *r)
65 {
66 size_t len;
67 ngx_table_elt_t *expires, *cc;
68 ngx_http_headers_conf_t *conf;
69
70 if (r->headers_out.status != NGX_HTTP_OK) {
71 return ngx_http_next_header_filter(r);
72 }
73
74 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
75
76 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
77
78 expires = ngx_http_add_header(&r->headers_out, ngx_http_headers_out);
79 if (expires == NULL) {
80 return NGX_ERROR;
81 }
82
83 r->headers_out.expires = expires;
84
85 cc = ngx_http_add_header(&r->headers_out, ngx_http_headers_out);
86 if (cc == NULL) {
87 return NGX_ERROR;
88 }
89
90 r->headers_out.cache_control = cc;
91
92 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
93
94 expires->key.len = sizeof("Expires") - 1;
95 expires->key.data = (u_char *) "Expires";
96 expires->value.len = len - 1;
97
98 cc->key.len = sizeof("Cache-Control") - 1;
99 cc->key.data = (u_char *) "Cache-Control";
100
101 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
102 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
103
104 cc->value.len = sizeof("no-cache") - 1;
105 cc->value.data = (u_char *) "no-cache";
106
107 } else {
108 expires->value.data = ngx_palloc(r->pool, len);
109 if (expires->value.data == NULL) {
110 return NGX_ERROR;
111 }
112
113 if (conf->expires == 0) {
114 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
115 ngx_cached_http_time.len + 1);
116
117 cc->value.len = sizeof("max-age=0") - 1;
118 cc->value.data = (u_char *) "max-age=0";
119
120 } else {
121 ngx_http_time(expires->value.data,
122 ngx_cached_time + conf->expires);
123
124 if (conf->expires < 0) {
125 cc->value.len = sizeof("no-cache") - 1;
126 cc->value.data = (u_char *) "no-cache";
127
128 } else {
129 cc->value.data = ngx_palloc(r->pool, NGX_TIME_T_LEN + 1);
130 if (cc->value.data == NULL) {
131 return NGX_ERROR;
132 }
133
134 cc->value.len = ngx_snprintf((char *) cc->value.data,
135 sizeof("max-age=")
136 + NGX_TIME_T_LEN,
137 "max-age=" TIME_T_FMT,
138 conf->expires);
139 }
140 }
141 }
142 }
143
144 return ngx_http_next_header_filter(r);
145 }
146
147
148 static int ngx_http_headers_filter_init(ngx_cycle_t *cycle)
149 {
150 ngx_http_next_header_filter = ngx_http_top_header_filter;
151 ngx_http_top_header_filter = ngx_http_headers_filter;
152
153 return NGX_OK;
154 }
155
156
157 static void *ngx_http_headers_create_conf(ngx_conf_t *cf)
158 {
159 ngx_http_headers_conf_t *conf;
160
161 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_headers_conf_t)))) {
162 return NGX_CONF_ERROR;
163 }
164
165 conf->expires = NGX_HTTP_EXPIRES_UNSET;
166
167 return conf;
168 }
169
170
171 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
172 void *parent, void *child)
173 {
174 ngx_http_headers_conf_t *prev = parent;
175 ngx_http_headers_conf_t *conf = child;
176
177 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
178 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
179 NGX_HTTP_EXPIRES_OFF : prev->expires;
180 }
181
182 return NGX_CONF_OK;
183 }
184
185
186 char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
187 {
188 ngx_http_headers_conf_t *hcf = conf;
189
190 ngx_uint_t minus;
191 ngx_str_t *value;
192
193 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
194 return "is duplicate";
195 }
196
197 value = cf->args->elts;
198
199 if (ngx_strcmp(value[1].data, "epoch") == 0) {
200 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
201 return NGX_CONF_OK;
202 }
203
204 if (ngx_strcmp(value[1].data, "off") == 0) {
205 hcf->expires = NGX_HTTP_EXPIRES_OFF;
206 return NGX_CONF_OK;
207 }
208
209 if (value[1].data[0] == '+') {
210 value[1].data++;
211 value[1].len--;
212 minus = 0;
213
214 } else if (value[1].data[0] == '-') {
215 value[1].data++;
216 value[1].len--;
217 minus = 1;
218
219 } else {
220 minus = 0;
221 }
222
223 hcf->expires = ngx_parse_time(&value[1], 1);
224 if (hcf->expires == NGX_ERROR) {
225 return "invalid value";
226 }
227
228 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
229 return "value must be less than 68 years";
230 }
231
232 if (minus) {
233 hcf->expires = - hcf->expires;
234 }
235
236 return NGX_CONF_OK;
237 }