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<?php
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include_once ($_SERVER['DOCUMENT_ROOT'] . "/php/dnsexit.php");
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//set array of allowed file types to prevent abuse
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$allowed = array('css','js','png','jpg','jpeg','gif','svg','ico');
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//check for request variable existence and that file type is allowed
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if(isset($_GET['file']) && isset($_GET['type']) && in_array(substr($_GET['file'],strrpos($_GET['file'],'.')+1), $allowed)){
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$data = file_get_contents(dirname(__FILE__).'/'.$_GET['file']); // grab the file contents
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$etag = '"'.md5($data).'"'; // generate a file Etag
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header('ETag: '.$etag); // output the Etag in the header
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// output the content-type header for each file type
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switch ($_GET['type']) {
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case 'css':
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header ("Content-Type: text/css; charset: UTF-8");
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break;
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case 'js':
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header ("Content-Type: text/javascript; charset: UTF-8");
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break;
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case 'png':
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header ("Content-Type: image/png");
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break;
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case 'jpg':
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case 'jpeg':
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header ("Content-Type: image/jpeg");
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break;
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case 'gif':
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header ("Content-Type: image/gif");
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break;
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case 'svg':
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header ("Content-Type: image/svg+xml");
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break;
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case 'ico':
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header ("Content-Type: image/vnd.microsoft.icon");
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break;
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}
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header('Cache-Control: max-age=86400, public'); //output the cache-control header
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// check the Etag the browser already has for the file and only serve the file if it is different
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if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && $etag == $_SERVER['HTTP_IF_NONE_MATCH']) {
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header('HTTP/1.1 304 Not Modified');
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header('Content-Length: 0');
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} else {
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echo $data;
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}
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}
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?>
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