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