Added cache support

[cx.git] / cx / lib / template.php

diff --git a/cx/lib/template.php b/cx/lib/template.php
index 6826d162ea22b1d2611073016e54f9f650baf07a..004c2abccf5b96eb9afd74a25239dc717d3a58a2 100644 (file)
--- a/cx/lib/template.php
+++ b/cx/lib/template.php
@@ -12,7 +12,7 @@ function cx_template_has_content($class, $path) {
        return file_exists(cx_template_content_path($class, $path));
 }
 
-function cx_template_output_content($class, $path) {
+function cx_template_output_content($class, $path, $cache_age = 30 * 86400) {
        $full_path = cx_template_content_path($class, $path);
 
        $extension = pathinfo($path, PATHINFO_EXTENSION);
@@ -25,8 +25,22 @@ function cx_template_output_content($class, $path) {
                //finfo_close($finfo); - Deprecated
        }
 
+       $file_size = filesize($full_path);
+       $file_modified_time = filemtime($full_path);
+
        header('Content-Type: ' . $mime_type);
-       header('Content-Length: ' . filesize($full_path));
+       header('Content-Length: ' . $file_size);
+       header('Cache-Control: public, max-age=604800');
+       header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $cache_age) . ' GMT');
+       header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $file_modified_time) . ' GMT');
+
+       if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
+               $request_modification = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
+               if ($request_modification >= $file_modified_time) {
+                       http_response_code(304);
+                       return;
+               }
+       }
 
        $fp = fopen($full_path, 'rb');
        fpassthru($fp);