make browser cache time for images configurable

2 files changed, 7 insertions, 1 deletions

diff --git a/conf/config.php b/conf/config.php
index d904751..b402b7f 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -15,6 +15,9 @@ $CONFIG['rrdtool'] = '/usr/bin/rrdtool';
 # default plugins to show on host page
 $CONFIG['overview'] = array('load', 'cpu', 'memory', 'swap');
 
+# browser cache time for the graphs (in seconds)
+$CONFIG['cache'] = 90;
+
 # default width/height of the graphs
 $CONFIG['width'] = 400;
 $CONFIG['heigth'] = 175;
diff --git a/type/Default.class.php b/type/Default.class.php
index ad880b3..ade3a16 100644
--- a/type/Default.class.php
+++ b/type/Default.class.php
@@ -5,6 +5,7 @@
 class Type_Default {
         var $datadir;
         var $rrdtool;
+        var $cache;
         var $args;
         var $seconds;
         var $data_sources = array('value');
@@ -25,6 +26,7 @@ class Type_Default {
         function __construct($config) {
                 $this->datadir = $config['datadir'];
                 $this->rrdtool = $config['rrdtool'];
+                $this->cache = $config['cache'];
                 $this->parse_get();
                 $this->rrd_files();
                 $this->identifiers = $this->file2identifier($this->files);
@@ -114,7 +116,8 @@ class Type_Default {
                 
                 if(!$debug) {
                         # caching
-                        header("Expires: " . date(DATE_RFC822,strtotime("90 seconds")));
+                        if (is_numeric($this->cache) && $this->cache > 0)
+                                header("Expires: " . date(DATE_RFC822,strtotime($this->cache." seconds")));
                         header("content-type: image/png");
                         $graphdata = implode(' ', $graphdata);
                         echo `$graphdata`;