mirror of https://github.com/BOINC/boinc.git
147 lines
4.3 KiB
PHP
147 lines
4.3 KiB
PHP
<?php
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require_once("../project/cache_parameters.inc");
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// mechanism for caching commonly-accessed pages
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function make_cache_dirs() {
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if (!@filemtime("../cache")) mkdir("../cache");
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for ($i=0;$i<256;$i++) {
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$j=sprintf("%02x",$i);
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if (!@filemtime("../cache/$j")) {
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mkdir("../cache/$j", 0700);
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}
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}
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}
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function get_path($params) {
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if (!@filemtime("../cache/00")) make_cache_dirs();
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$y = pathinfo($_SERVER["PHP_SELF"]);
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$z = $y["basename"];
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// add a layer of subdirectories for reducing file lookup time
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$sz = substr(md5($z."_".urlencode($params)),1,2);
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$path = "../cache/".$sz."/".$z;
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if ($params) {
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$path = $path."_".urlencode($params);
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}
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return $path;
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}
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function disk_usage($dir) {
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$usage=0;
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if ($handle=@opendir($dir)) {
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while ($file=readdir($handle)) {
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if (($file != ".") && ($file != "..")) {
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if (@is_dir($dir."/".$file)) {
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$usage+=disk_usage($dir."/".$file);
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} else {
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$usage+=@filesize($dir."/".$file);
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}
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}
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}
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@closedir($handle);
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}
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return $usage;
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}
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function clean_cache($max_age, $dir) {
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$start_dir = getcwd();
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if (!chdir($dir)) {
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return;
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}
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if ($handle=@opendir(".")) {
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while ($file=readdir($handle)) {
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if ($file == ".") continue;
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if ($file == "..") continue;
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// don't let hackers trick us into deleting other files!
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if (strstr($file, "..")) {
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continue;
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}
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if (@is_dir($file)) {
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clean_cache($max_age, $file);
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} else {
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if ((time()-@filemtime($file))>$max_age) {
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//echo "unlinking ".getcwd()."/$file\n";
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@unlink($file);
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}
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}
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}
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@closedir($handle);
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}
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chdir($start_dir);
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}
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function start_cache($max_age, $params=""){
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$path = get_path($params);
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// check free disk space every once in a while
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if (!(rand() % CACHE_SIZE_CHECK_FREQ)) {
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$too_old=86400;
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while ((disk_free_space("../cache") < MIN_FREE_SPACE) ||
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(disk_usage("../cache") > MAX_CACHE_USAGE)) {
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clean_cache($too_old, "../cache");
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$too_old/=2;
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}
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}
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if ($max_age) {
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$request = getallheaders();
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// Check to see if this is a conditional fetch.
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$lastmodified = @filemtime($path);
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$if_modified_since = isset($request['If-Modified-Since']) ?
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(explode(';',$request['If-Modified-Since'])) :
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false;
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if ($if_modified_since) {
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$if_modified_since=strtotime($if_modified_since[0]);
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}
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if ($if_modified_since && ($if_modified_since == $lastmodified)) {
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s",$lastmodified) . " GMT");
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Header('HTTP/1.0 304 Not Modified');
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exit;
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}
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if ($lastmodified<time()-$max_age){
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// If cached version is too old (or non-existent)
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// generate the page and write to cache
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//
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ob_start();
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ob_implicit_flush(0);
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
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Header("Expires: " . gmdate("D, d M Y H:i:s",time()+$max_age) . " GMT");
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Header("Cache-Control: public, max-age=" . $max_age);
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} else {
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// Otherwise serve the cached version and exit
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//
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if (strstr($params, "format=xml")) {
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header('Content-type: text/xml');
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}
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s",$lastmodified) . " GMT");
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Header("Expires: " . gmdate("D, d M Y H:i:s",$lastmodified+$max_age) . " GMT");
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Header("Cache-Control: public, max-age=" . $max_age );
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readfile($path);
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exit;
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}
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}
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}
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// write output buffer both to client and to cache
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//
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function end_cache($max_age,$params=""){
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// for the benefit of hackers
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if (strstr($params, "..")) {
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return;
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}
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if ($max_age) {
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$path = get_path($params);
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$fhandle=fopen($path, "w");
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$page=ob_get_contents();
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ob_end_flush();
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fwrite($fhandle, $page);
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fclose($fhandle);
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}
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}
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?>
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