47adb6d65a
Automatically refactors wg prefixed globals to use MediaWikiServices config using Rector. Doesn't include files that set globals or files that fail CI. Rector Gist: https://gist.github.com/tchin25/7cc54f6d23aedef010b22e4dfbead228 * This patch uses a modified source code rector library for our specific use case and the rector will have different effects without it. A writeup for future reference is here: https://meta.wikimedia.org/wiki/User:TChin_(WMF)/Using_Rector_On_MediaWiki Change-Id: I1a691f01cd82e60bf41207d32501edb4b9835e37
130 lines
4.5 KiB
PHP
130 lines
4.5 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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use MediaWiki\MediaWikiServices;
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/**
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* Functions related to the output of file content
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*/
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class StreamFile {
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// Do not send any HTTP headers unless requested by caller (e.g. body only)
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/** @deprecated since 1.34 */
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public const STREAM_HEADLESS = HTTPFileStreamer::STREAM_HEADLESS;
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// Do not try to tear down any PHP output buffers
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/** @deprecated since 1.34 */
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public const STREAM_ALLOW_OB = HTTPFileStreamer::STREAM_ALLOW_OB;
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/**
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* Stream a file to the browser, adding all the headings and fun stuff.
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* Headers sent include: Content-type, Content-Length, Last-Modified,
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* and Content-Disposition.
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*
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* @param string $fname Full name and path of the file to stream
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* @param array $headers Any additional headers to send if the file exists
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* @param bool $sendErrors Send error messages if errors occur (like 404)
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* @param array $optHeaders HTTP request header map (e.g. "range") (use lowercase keys)
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* @param int $flags Bitfield of STREAM_* constants
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* @throws MWException
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* @return bool Success
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*/
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public static function stream(
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$fname, $headers = [], $sendErrors = true, $optHeaders = [], $flags = 0
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) {
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if ( FileBackend::isStoragePath( $fname ) ) {
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throw new InvalidArgumentException( __FUNCTION__ . " given storage path '$fname'." );
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}
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$streamer = new HTTPFileStreamer(
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$fname,
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[
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'obResetFunc' => 'wfResetOutputBuffers',
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'streamMimeFunc' => [ __CLASS__, 'contentTypeFromPath' ]
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]
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);
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return $streamer->stream( $headers, $sendErrors, $optHeaders, $flags );
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}
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/**
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* Determine the file type of a file based on the path
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*
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* @param string $filename Storage path or file system path
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* @param bool $safe Whether to do retroactive upload prevention checks
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* @return null|string
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*/
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public static function contentTypeFromPath( $filename, $safe = true ) {
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$trivialMimeDetection = MediaWikiServices::getInstance()->getMainConfig()->get( 'TrivialMimeDetection' );
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$ext = strrchr( $filename, '.' );
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$ext = $ext ? 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 ( $trivialMimeDetection ) {
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switch ( $ext ) {
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case 'gif':
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return 'image/gif';
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case 'png':
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return 'image/png';
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case 'jpg':
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case 'jpeg':
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return 'image/jpeg';
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}
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return 'unknown/unknown';
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}
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$magic = MediaWikiServices::getInstance()->getMimeAnalyzer();
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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->getMimeTypeFromExtensionOrNull( $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 ( $safe ) {
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$mainConfig = MediaWikiServices::getInstance()->getMainConfig();
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$prohibitedFileExtensions = $mainConfig->get( 'ProhibitedFileExtensions' );
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$checkFileExtensions = $mainConfig->get( 'CheckFileExtensions' );
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$strictFileExtensions = $mainConfig->get( 'StrictFileExtensions' );
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$fileExtensions = $mainConfig->get( 'FileExtensions' );
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$verifyMimeType = $mainConfig->get( 'VerifyMimeType' );
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$mimeTypeExclusions = $mainConfig->get( 'MimeTypeExclusions' );
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list( , $extList ) = UploadBase::splitExtensions( $filename );
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if ( UploadBase::checkFileExtensionList( $extList, $prohibitedFileExtensions ) ) {
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return 'unknown/unknown';
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}
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if ( $checkFileExtensions && $strictFileExtensions
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&& !UploadBase::checkFileExtensionList( $extList, $fileExtensions )
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) {
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return 'unknown/unknown';
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}
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if ( $verifyMimeType && in_array( strtolower( $type ), $mimeTypeExclusions ) ) {
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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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}
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