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<?php
/**
* Functions related to the output of file content
*
* @file
*/
/** */
function wfStreamFile( $fname, $headers = array() ) {
$stat = @stat( $fname );
if ( !$stat ) {
header( 'HTTP/1.0 404 Not Found' );
header( 'Cache-Control: no-cache' );
header( 'Content-Type: text/html; charset=utf-8' );
$encFile = htmlspecialchars( $fname );
$encScript = htmlspecialchars( $_SERVER['SCRIPT_NAME'] );
echo "<html><body>
<h1>File not found</h1>
<p>Although this PHP script ($encScript) exists, the file requested for output
($encFile) does not.</p>
</body></html>
";
return;
}
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $stat['mtime'] ) . ' GMT' );
// Cancel output buffering and gzipping if set
wfResetOutputBuffers();
$type = wfGetType( $fname );
if ( $type and $type!="unknown/unknown") {
header("Content-type: $type");
} else {
header('Content-type: application/x-wiki');
}
// Don't stream it out as text/html if there was a PHP error
if ( headers_sent() ) {
echo "Headers already sent, terminating.\n";
return;
}
global $wgLanguageCode;
header( "Content-Disposition: inline;filename*=utf-8'$wgLanguageCode'" . urlencode( basename( $fname ) ) );
foreach ( $headers as $header ) {
header( $header );
}
if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
$modsince = preg_replace( '/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
$sinceTime = strtotime( $modsince );
if ( $stat['mtime'] <= $sinceTime ) {
ini_set('zlib.output_compression', 0);
header( "HTTP/1.0 304 Not Modified" );
return;
}
}
header( 'Content-Length: ' . $stat['size'] );
readfile( $fname );
}
/** */
function wfGetType( $filename, $safe = true ) {
global $wgTrivialMimeDetection;
$ext = strrchr($filename, '.');
$ext = $ext === false ? '' : strtolower( substr( $ext, 1 ) );
# trivial detection by file extension,
# used for thumbnails (thumb.php)
if ($wgTrivialMimeDetection) {
switch ($ext) {
case 'gif': return 'image/gif';
case 'png': return 'image/png';
case 'jpg': return 'image/jpeg';
case 'jpeg': return 'image/jpeg';
}
return 'unknown/unknown';
}
$magic = MimeMagic::singleton();
// Use the extension only, rather than magic numbers, to avoid opening
// up vulnerabilities due to uploads of files with allowed extensions
// but disallowed types.
$type = $magic->guessTypesForExtension( $ext );
/**
* Double-check some security settings that were done on upload but might
* have changed since.
*/
if ( $safe ) {
global $wgFileBlacklist, $wgCheckFileExtensions, $wgStrictFileExtensions,
$wgFileExtensions, $wgVerifyMimeType, $wgMimeTypeBlacklist;
list( , $extList ) = UploadBase::splitExtensions( $filename );
if ( UploadBase::checkFileExtensionList( $extList, $wgFileBlacklist ) ) {
return 'unknown/unknown';
}
if ( $wgCheckFileExtensions && $wgStrictFileExtensions
&& !UploadBase::checkFileExtensionList( $extList, $wgFileExtensions ) )
{
return 'unknown/unknown';
}
if ( $wgVerifyMimeType && in_array( strtolower( $type ), $wgMimeTypeBlacklist ) ) {
return 'unknown/unknown';
}
}
return $type;
}
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