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<?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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/** |
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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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const STREAM_HEADLESS = HTTPFileStreamer::STREAM_HEADLESS; |
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// Do not try to tear down any PHP output buffers |
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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 integer $flags Bitfield of STREAM_* constants |
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* @throws MWException |
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* @return bool Success |
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*/ |
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public static function stream( |
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$fname, $headers = [], $sendErrors = true, $optHeaders = [], $flags = 0 |
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) { |
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if ( FileBackend::isStoragePath( $fname ) ) { // sanity |
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throw new InvalidArgumentException( __FUNCTION__ . " given storage path '$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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* Send out a standard 404 message for a file |
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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 integer $flags Bitfield of STREAM_* constants |
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* @since 1.24 |
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*/ |
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public static function send404Message( $fname, $flags = 0 ) { |
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HTTPFileStreamer::send404Message( $fname, $flags ); |
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} |
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/** |
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* Convert a Range header value to an absolute (start, end) range tuple |
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* |
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* @param string $range Range header value |
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* @param integer $size File size |
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* @return array|string Returns error string on failure (start, end, length) |
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* @since 1.24 |
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*/ |
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public static function parseRange( $range, $size ) { |
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return HTTPFileStreamer::parseRange( $range, $size ); |
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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 blacklist 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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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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View Code Duplication |
switch ( $ext ) { |
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case 'gif': |
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return 'image/gif'; |
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case 'png': |
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return 'image/png'; |
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case 'jpg': |
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return 'image/jpeg'; |
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case 'jpeg': |
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return 'image/jpeg'; |
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} |
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return 'unknown/unknown'; |
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} |
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$magic = 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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} |
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wikimedia /
mediawiki
