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<?php if (!defined('PmWiki')) exit();
/* Copyright 2006-2020 Patrick R. Michaud (pmichaud@pobox.com)
This file is part of PmWiki; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version. See pmwiki.php for full details.
Script maintained by Petko YOTOV www.pmwiki.org/petko
*/
## Browser cache-control. If this is a cacheable action (e.g., browse,
## diff), then set the Last-Modified header to the time the site was
## last modified. If the browser has provided us with a matching
## If-Modified-Since request header, we can return 304 Not Modified.
SDV($LastModFile,"$WorkDir/.lastmod");
if (!$LastModFile) return;
$LastModTime = @filemtime($LastModFile);
foreach(get_included_files() as $f)
{ $v = @filemtime($f); if ($v > $LastModTime) $LastModTime = $v; }
if (@$EnableIMSCaching) {
SDV($IMSCookie, $CookiePrefix.'imstime');
SDV($IMSCookieExpires, $Now + 60*60*24*30);
SDV($IMSInvalidators, array('authpw', 'author'));
$LogoutCookies[] = $IMSCookie;
if ($IMSCookie) {
$IMSTime = @$_COOKIE[$IMSCookie];
if ($IMSTime < $LastModTime
|| array_intersect($IMSInvalidators, array_keys($_POST))) {
$IMSTime = $Now;
pmsetcookie($IMSCookie, $IMSTime, $IMSCookieExpires, '/');
}
} else $IMSTime = $LastModTime;
if (in_array($action, (array)$CacheActions)) {
$HTTPLastMod = gmdate('D, d M Y H:i:s \G\M\T',$IMSTime);
$HTTPHeaders[] = "Cache-Control: no-cache";
$HTTPHeaders[] = "Last-Modified: $HTTPLastMod";
if (@$_SERVER['HTTP_IF_MODIFIED_SINCE']==$HTTPLastMod) {
header("HTTP/1.0 304 Not Modified");
header("Cache-Control: no-cache");
header("Expires: ");
header("Last-Modified: $HTTPLastMod");
exit();
}
}
}
if ($NoHTMLCache
|| !@$PageCacheDir
|| count($_POST) > 0
|| count($_GET) > 1
|| (count($_GET) == 1 && !@$_GET['n'])) { $NoHTMLCache |= 1; return; }
mkdirp($PageCacheDir);
if (!file_exists("$PageCacheDir/.htaccess")
&& $fp = @fopen("$PageCacheDir/.htaccess", "w"))
{ fwrite($fp, $DenyHtaccessContent); fclose($fp); }
SDV($PageCacheFileFmt, "%s/%s,cache");
SDV($PageCacheFile, sprintf($PageCacheFileFmt, $PageCacheDir, $pagename));
if (file_exists($PageCacheFile) && @filemtime($PageCacheFile) < $LastModTime)
@unlink($PageCacheFile);
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