--- nginx-0.7.55.org/src/http/modules/ngx_http_secure_link_module.c	2009-05-13 14:44:15.000000000 +0200
+++ nginx-0.7.55.org/src/http/modules/ngx_http_secure_link_module.c	2009-05-13 15:00:49.000000000 +0200
@@ -12,6 +12,7 @@ 
 
 typedef struct {
     ngx_str_t  secret;
+		time_t timeout;
 } ngx_http_secure_link_conf_t;
 
 
@@ -30,6 +31,12 @@ 
       offsetof(ngx_http_secure_link_conf_t, secret),
       NULL },
 
+			{ ngx_string("secure_link_timeout"),
+			NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+			ngx_conf_set_sec_slot,
+			NGX_HTTP_LOC_CONF_OFFSET,
+			offsetof(ngx_http_secure_link_conf_t, timeout),
+			NULL },
       ngx_null_command
 };
 
@@ -67,22 +74,36 @@ 
 
 static ngx_str_t  ngx_http_secure_link = ngx_string("secure_link");
 
+static u_char
+ngx_hex2int(u_char hex)
+{
+	hex = hex - '0';
+	if (hex > 9) {
+	hex = (hex + '0' - 1) | 0x20;
+	hex = hex - 'a' + 11;
+	}
+	if (hex > 15)
+	hex = 0xFF;
+
+	return hex;
+}
 
 static ngx_int_t
 ngx_http_secure_link_variable(ngx_http_request_t *r,
      ngx_http_variable_value_t *v, uintptr_t data)
 {
-    u_char                        *p, *start, *end, *last;
-    size_t                         len;
+		u_char *p, *start, *end, *last, *tss, *tse;
+		size_t                         len, tslen;
     ngx_int_t                      n;
     ngx_uint_t                     i;
     ngx_md5_t                      md5;
+		time_t 												 ts;
     ngx_http_secure_link_conf_t  *conf;
     u_char                         hash[16];
 
     conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module);
 
-    if (conf->secret.len == 0) {
+		if (conf->secret.len == 0 || conf->timeout == 0) {
         goto not_found;
     }
 
@@ -103,22 +124,46 @@ 
     while (p < last) {
         if (*p++ == '/') {
             end = p - 1;
-            goto url_start;
+						goto tstamp_start;
         }
     }
 
     goto not_found;
 
+		tstamp_start:
+
+		tss = p;
+
+		while (p < last) {
+			if (*p++ == '/') {
+			tse = p - 1;
+			goto url_start;
+		}
+	}
+
+	goto not_found;
+
 url_start:
 
+		tslen = tse - tss;
     len = last - p;
 
-    if (end - start != 32 || len == 0) {
+		if (end - start != 32 || len == 0 || tslen != 8) {
         goto not_found;
     }
 
+		ts = 0;
+		for (i = 0; i < 8; i++) {
+		ts = (ts << 4) + ngx_hex2int(tss[i]);
+		}
+
+		if (ts < r->start_sec - conf->timeout) {
+			goto not_found;
+		}
+
     ngx_md5_init(&md5);
     ngx_md5_update(&md5, p, len);
+		ngx_md5_update(&md5, tss, tslen);
     ngx_md5_update(&md5, conf->secret.data, conf->secret.len);
     ngx_md5_final(hash, &md5);
 
@@ -160,7 +205,8 @@ 
      *
      *     conf->secret = { 0, NULL }
      */
-
+		
+		conf->timeout = NGX_CONF_UNSET;
     return conf;
 }
 
@@ -172,6 +218,7 @@ 
     ngx_http_secure_link_conf_t *conf = child;
 
     ngx_conf_merge_str_value(conf->secret, prev->secret, "");
+		ngx_conf_merge_sec_value(conf->timeout, prev->timeout, 3600);
 
     return NGX_CONF_OK;
 }