<?php
/**
- * Module defining helper functions for detecting and dealing with MIME types.
- *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
*
* @file
*/
+use MediaWiki\MediaWikiServices;
+use Wikimedia\Assert\Assert;
/**
- * Defines a set of well known MIME types
- * This is used as a fallback to mime.types files.
- * An extensive list of well known MIME types is provided by
- * the file mime.types in the includes directory.
- *
- * This list concatenated with mime.types is used to create a MIME <-> ext
- * map. Each line contains a MIME type followed by a space separated list of
- * extensions. If multiple extensions for a single MIME type exist or if
- * multiple MIME types exist for a single extension then in most cases
- * MediaWiki assumes that the first extension following the MIME type is the
- * canonical extension, and the first time a MIME type appears for a certain
- * extension is considered the canonical MIME type.
- *
- * (Note that appending $wgMimeTypeFile to the end of MM_WELL_KNOWN_MIME_TYPES
- * sucks because you can't redefine canonical types. This could be fixed by
- * appending MM_WELL_KNOWN_MIME_TYPES behind $wgMimeTypeFile, but who knows
- * what will break? In practice this probably isn't a problem anyway -- Bryan)
+ * @deprecated since 1.29
+ * MimeAnalyzer should be used instead of MimeMagic
*/
-define( 'MM_WELL_KNOWN_MIME_TYPES', <<<END_STRING
-application/ogg ogx ogg ogm ogv oga spx
-application/pdf pdf
-application/vnd.oasis.opendocument.chart odc
-application/vnd.oasis.opendocument.chart-template otc
-application/vnd.oasis.opendocument.database odb
-application/vnd.oasis.opendocument.formula odf
-application/vnd.oasis.opendocument.formula-template otf
-application/vnd.oasis.opendocument.graphics odg
-application/vnd.oasis.opendocument.graphics-template otg
-application/vnd.oasis.opendocument.image odi
-application/vnd.oasis.opendocument.image-template oti
-application/vnd.oasis.opendocument.presentation odp
-application/vnd.oasis.opendocument.presentation-template otp
-application/vnd.oasis.opendocument.spreadsheet ods
-application/vnd.oasis.opendocument.spreadsheet-template ots
-application/vnd.oasis.opendocument.text odt
-application/vnd.oasis.opendocument.text-master otm
-application/vnd.oasis.opendocument.text-template ott
-application/vnd.oasis.opendocument.text-web oth
-application/javascript js
-application/x-shockwave-flash swf
-audio/midi mid midi kar
-audio/mpeg mpga mpa mp2 mp3
-audio/x-aiff aif aiff aifc
-audio/x-wav wav
-audio/ogg oga spx ogg
-image/x-bmp bmp
-image/gif gif
-image/jpeg jpeg jpg jpe
-image/png png
-image/svg+xml svg
-image/svg svg
-image/tiff tiff tif
-image/vnd.djvu djvu
-image/x.djvu djvu
-image/x-djvu djvu
-image/x-portable-pixmap ppm
-image/x-xcf xcf
-text/plain txt
-text/html html htm
-video/ogg ogv ogm ogg
-video/mpeg mpg mpeg
-END_STRING
-);
-
-/**
- * Defines a set of well known MIME info entries
- * This is used as a fallback to mime.info files.
- * An extensive list of well known MIME types is provided by
- * the file mime.info in the includes directory.
- */
-define( 'MM_WELL_KNOWN_MIME_INFO', <<<END_STRING
-application/pdf [OFFICE]
-application/vnd.oasis.opendocument.chart [OFFICE]
-application/vnd.oasis.opendocument.chart-template [OFFICE]
-application/vnd.oasis.opendocument.database [OFFICE]
-application/vnd.oasis.opendocument.formula [OFFICE]
-application/vnd.oasis.opendocument.formula-template [OFFICE]
-application/vnd.oasis.opendocument.graphics [OFFICE]
-application/vnd.oasis.opendocument.graphics-template [OFFICE]
-application/vnd.oasis.opendocument.image [OFFICE]
-application/vnd.oasis.opendocument.image-template [OFFICE]
-application/vnd.oasis.opendocument.presentation [OFFICE]
-application/vnd.oasis.opendocument.presentation-template [OFFICE]
-application/vnd.oasis.opendocument.spreadsheet [OFFICE]
-application/vnd.oasis.opendocument.spreadsheet-template [OFFICE]
-application/vnd.oasis.opendocument.text [OFFICE]
-application/vnd.oasis.opendocument.text-template [OFFICE]
-application/vnd.oasis.opendocument.text-master [OFFICE]
-application/vnd.oasis.opendocument.text-web [OFFICE]
-application/javascript text/javascript application/x-javascript [EXECUTABLE]
-application/x-shockwave-flash [MULTIMEDIA]
-audio/midi [AUDIO]
-audio/x-aiff [AUDIO]
-audio/x-wav [AUDIO]
-audio/mp3 audio/mpeg [AUDIO]
-application/ogg audio/ogg video/ogg [MULTIMEDIA]
-image/x-bmp image/x-ms-bmp image/bmp [BITMAP]
-image/gif [BITMAP]
-image/jpeg [BITMAP]
-image/png [BITMAP]
-image/svg+xml [DRAWING]
-image/tiff [BITMAP]
-image/vnd.djvu [BITMAP]
-image/x-xcf [BITMAP]
-image/x-portable-pixmap [BITMAP]
-text/plain [TEXT]
-text/html [TEXT]
-video/ogg [VIDEO]
-video/mpeg [VIDEO]
-unknown/unknown application/octet-stream application/x-empty [UNKNOWN]
-END_STRING
-);
-
-/**
- * Implements functions related to MIME types such as detection and mapping to
- * file extension.
- *
- * Instances of this class are stateless, there only needs to be one global instance
- * of MimeMagic. Please use MimeMagic::singleton() to get that instance.
- */
-class MimeMagic {
- /**
- * @var array Mapping of media types to arrays of MIME types.
- * This is used by findMediaType and getMediaType, respectively
- */
- protected $mMediaTypes = null;
-
- /** @var array Map of MIME type aliases
- */
- protected $mMimeTypeAliases = null;
-
- /** @var array Map of MIME types to file extensions (as a space separated list)
- */
- protected $mMimeToExt = null;
-
- /** @var array Map of file extensions types to MIME types (as a space separated list)
- */
- public $mExtToMime = null;
-
- /** @var IEContentAnalyzer
- */
- protected $mIEAnalyzer;
-
- /** @var string Extra MIME types, set for example by media handling extensions
- */
- private $mExtraTypes = '';
-
- /** @var string Extra MIME info, set for example by media handling extensions
- */
- private $mExtraInfo = '';
-
- /** @var Config */
- private $mConfig;
-
- /** @var MimeMagic The singleton instance
- */
- private static $instance = null;
-
- /** Initializes the MimeMagic object. This is called by MimeMagic::singleton().
- *
- * This constructor parses the mime.types and mime.info files and build internal mappings.
- *
- * @todo Make this constructor private once everything uses the singleton instance
- * @param Config $config
- */
- function __construct( Config $config = null ) {
- if ( !$config ) {
- wfDebug( __METHOD__ . ' called with no Config instance passed to it' );
- $config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
- }
- $this->mConfig = $config;
-
- /**
- * --- load mime.types ---
- */
-
- global $IP;
-
- # Allow media handling extensions adding MIME-types and MIME-info
- Hooks::run( 'MimeMagicInit', [ $this ] );
-
- $types = MM_WELL_KNOWN_MIME_TYPES;
-
- $mimeTypeFile = $this->mConfig->get( 'MimeTypeFile' );
- if ( $mimeTypeFile == 'includes/mime.types' ) {
- $mimeTypeFile = "$IP/$mimeTypeFile";
- }
-
- if ( $mimeTypeFile ) {
- if ( is_file( $mimeTypeFile ) && is_readable( $mimeTypeFile ) ) {
- wfDebug( __METHOD__ . ": loading mime types from $mimeTypeFile\n" );
- $types .= "\n";
- $types .= file_get_contents( $mimeTypeFile );
- } else {
- wfDebug( __METHOD__ . ": can't load mime types from $mimeTypeFile\n" );
- }
- } else {
- wfDebug( __METHOD__ . ": no mime types file defined, using built-ins only.\n" );
- }
-
- $types .= "\n" . $this->mExtraTypes;
-
- $types = str_replace( [ "\r\n", "\n\r", "\n\n", "\r\r", "\r" ], "\n", $types );
- $types = str_replace( "\t", " ", $types );
-
- $this->mMimeToExt = [];
- $this->mExtToMime = [];
-
- $lines = explode( "\n", $types );
- foreach ( $lines as $s ) {
- $s = trim( $s );
- if ( empty( $s ) ) {
- continue;
- }
- if ( strpos( $s, '#' ) === 0 ) {
- continue;
- }
-
- $s = strtolower( $s );
- $i = strpos( $s, ' ' );
-
- if ( $i === false ) {
- continue;
- }
-
- $mime = substr( $s, 0, $i );
- $ext = trim( substr( $s, $i + 1 ) );
-
- if ( empty( $ext ) ) {
- continue;
- }
-
- if ( !empty( $this->mMimeToExt[$mime] ) ) {
- $this->mMimeToExt[$mime] .= ' ' . $ext;
- } else {
- $this->mMimeToExt[$mime] = $ext;
- }
-
- $extensions = explode( ' ', $ext );
-
- foreach ( $extensions as $e ) {
- $e = trim( $e );
- if ( empty( $e ) ) {
- continue;
- }
-
- if ( !empty( $this->mExtToMime[$e] ) ) {
- $this->mExtToMime[$e] .= ' ' . $mime;
- } else {
- $this->mExtToMime[$e] = $mime;
- }
- }
- }
-
- /**
- * --- load mime.info ---
- */
-
- $mimeInfoFile = $this->mConfig->get( 'MimeInfoFile' );
- if ( $mimeInfoFile == 'includes/mime.info' ) {
- $mimeInfoFile = "$IP/$mimeInfoFile";
- }
-
- $info = MM_WELL_KNOWN_MIME_INFO;
-
- if ( $mimeInfoFile ) {
- if ( is_file( $mimeInfoFile ) && is_readable( $mimeInfoFile ) ) {
- wfDebug( __METHOD__ . ": loading mime info from $mimeInfoFile\n" );
- $info .= "\n";
- $info .= file_get_contents( $mimeInfoFile );
- } else {
- wfDebug( __METHOD__ . ": can't load mime info from $mimeInfoFile\n" );
- }
- } else {
- wfDebug( __METHOD__ . ": no mime info file defined, using built-ins only.\n" );
- }
-
- $info .= "\n" . $this->mExtraInfo;
-
- $info = str_replace( [ "\r\n", "\n\r", "\n\n", "\r\r", "\r" ], "\n", $info );
- $info = str_replace( "\t", " ", $info );
-
- $this->mMimeTypeAliases = [];
- $this->mMediaTypes = [];
-
- $lines = explode( "\n", $info );
- foreach ( $lines as $s ) {
- $s = trim( $s );
- if ( empty( $s ) ) {
- continue;
- }
- if ( strpos( $s, '#' ) === 0 ) {
- continue;
- }
-
- $s = strtolower( $s );
- $i = strpos( $s, ' ' );
-
- if ( $i === false ) {
- continue;
- }
-
- # print "processing MIME INFO line $s<br>";
-
- $match = [];
- if ( preg_match( '!\[\s*(\w+)\s*\]!', $s, $match ) ) {
- $s = preg_replace( '!\[\s*(\w+)\s*\]!', '', $s );
- $mtype = trim( strtoupper( $match[1] ) );
- } else {
- $mtype = MEDIATYPE_UNKNOWN;
- }
-
- $m = explode( ' ', $s );
-
- if ( !isset( $this->mMediaTypes[$mtype] ) ) {
- $this->mMediaTypes[$mtype] = [];
- }
-
- foreach ( $m as $mime ) {
- $mime = trim( $mime );
- if ( empty( $mime ) ) {
- continue;
- }
-
- $this->mMediaTypes[$mtype][] = $mime;
- }
-
- if ( count( $m ) > 1 ) {
- $main = $m[0];
- $mCount = count( $m );
- for ( $i = 1; $i < $mCount; $i += 1 ) {
- $mime = $m[$i];
- $this->mMimeTypeAliases[$mime] = $main;
- }
- }
- }
- }
-
+class MimeMagic extends MimeAnalyzer {
/**
* Get an instance of this class
* @return MimeMagic
+ * @deprecated since 1.28 get a MimeAnalyzer instance from MediaWikiServices
*/
public static function singleton() {
- if ( self::$instance === null ) {
- self::$instance = new MimeMagic(
- ConfigFactory::getDefaultInstance()->makeConfig( 'main' )
- );
- }
- return self::$instance;
- }
-
- /**
- * Adds to the list mapping MIME to file extensions.
- * As an extension author, you are encouraged to submit patches to
- * MediaWiki's core to add new MIME types to mime.types.
- * @param string $types
- */
- public function addExtraTypes( $types ) {
- $this->mExtraTypes .= "\n" . $types;
- }
-
- /**
- * Adds to the list mapping MIME to media type.
- * As an extension author, you are encouraged to submit patches to
- * MediaWiki's core to add new MIME info to mime.info.
- * @param string $info
- */
- public function addExtraInfo( $info ) {
- $this->mExtraInfo .= "\n" . $info;
- }
-
- /**
- * Returns a list of file extensions for a given MIME type as a space
- * separated string or null if the MIME type was unrecognized. Resolves
- * MIME type aliases.
- *
- * @param string $mime
- * @return string|null
- */
- public function getExtensionsForType( $mime ) {
- $mime = strtolower( $mime );
-
- // Check the mime-to-ext map
- if ( isset( $this->mMimeToExt[$mime] ) ) {
- return $this->mMimeToExt[$mime];
- }
-
- // Resolve the MIME type to the canonical type
- if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
- $mime = $this->mMimeTypeAliases[$mime];
- if ( isset( $this->mMimeToExt[$mime] ) ) {
- return $this->mMimeToExt[$mime];
- }
- }
-
- return null;
- }
-
- /**
- * Returns a list of MIME types for a given file extension as a space
- * separated string or null if the extension was unrecognized.
- *
- * @param string $ext
- * @return string|null
- */
- public function getTypesForExtension( $ext ) {
- $ext = strtolower( $ext );
-
- $r = isset( $this->mExtToMime[$ext] ) ? $this->mExtToMime[$ext] : null;
- return $r;
- }
-
- /**
- * Returns a single MIME type for a given file extension or null if unknown.
- * This is always the first type from the list returned by getTypesForExtension($ext).
- *
- * @param string $ext
- * @return string|null
- */
- public function guessTypesForExtension( $ext ) {
- $m = $this->getTypesForExtension( $ext );
- if ( is_null( $m ) ) {
- return null;
- }
-
- // TODO: Check if this is needed; strtok( $m, ' ' ) should be sufficient
- $m = trim( $m );
- $m = preg_replace( '/\s.*$/', '', $m );
-
- return $m;
- }
-
- /**
- * Tests if the extension matches the given MIME type. Returns true if a
- * match was found, null if the MIME type is unknown, and false if the
- * MIME type is known but no matches where found.
- *
- * @param string $extension
- * @param string $mime
- * @return bool|null
- */
- public function isMatchingExtension( $extension, $mime ) {
- $ext = $this->getExtensionsForType( $mime );
-
- if ( !$ext ) {
- return null; // Unknown MIME type
- }
-
- $ext = explode( ' ', $ext );
-
- $extension = strtolower( $extension );
- return in_array( $extension, $ext );
- }
-
- /**
- * Returns true if the MIME type is known to represent an image format
- * supported by the PHP GD library.
- *
- * @param string $mime
- *
- * @return bool
- */
- public function isPHPImageType( $mime ) {
- // As defined by imagegetsize and image_type_to_mime
- static $types = [
- 'image/gif', 'image/jpeg', 'image/png',
- 'image/x-bmp', 'image/xbm', 'image/tiff',
- 'image/jp2', 'image/jpeg2000', 'image/iff',
- 'image/xbm', 'image/x-xbitmap',
- 'image/vnd.wap.wbmp', 'image/vnd.xiff',
- 'image/x-photoshop',
- 'application/x-shockwave-flash',
- ];
-
- return in_array( $mime, $types );
- }
-
- /**
- * Returns true if the extension represents a type which can
- * be reliably detected from its content. Use this to determine
- * whether strict content checks should be applied to reject
- * invalid uploads; if we can't identify the type we won't
- * be able to say if it's invalid.
- *
- * @todo Be more accurate when using fancy MIME detector plugins;
- * right now this is the bare minimum getimagesize() list.
- * @param string $extension
- * @return bool
- */
- function isRecognizableExtension( $extension ) {
- static $types = [
- // Types recognized by getimagesize()
- 'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd',
- 'bmp', 'tiff', 'tif', 'jpc', 'jp2',
- 'jpx', 'jb2', 'swc', 'iff', 'wbmp',
- 'xbm',
-
- // Formats we recognize magic numbers for
- 'djvu', 'ogx', 'ogg', 'ogv', 'oga', 'spx',
- 'mid', 'pdf', 'wmf', 'xcf', 'webm', 'mkv', 'mka',
- 'webp',
-
- // XML formats we sure hope we recognize reliably
- 'svg',
- ];
- return in_array( strtolower( $extension ), $types );
- }
-
- /**
- * Improves a MIME type using the file extension. Some file formats are very generic,
- * so their MIME type is not very meaningful. A more useful MIME type can be derived
- * by looking at the file extension. Typically, this method would be called on the
- * result of guessMimeType().
- *
- * @param string $mime The MIME type, typically guessed from a file's content.
- * @param string $ext The file extension, as taken from the file name
- *
- * @return string The MIME type
- */
- public function improveTypeFromExtension( $mime, $ext ) {
- if ( $mime === 'unknown/unknown' ) {
- if ( $this->isRecognizableExtension( $ext ) ) {
- wfDebug( __METHOD__ . ': refusing to guess mime type for .' .
- "$ext file, we should have recognized it\n" );
- } else {
- // Not something we can detect, so simply
- // trust the file extension
- $mime = $this->guessTypesForExtension( $ext );
- }
- } elseif ( $mime === 'application/x-opc+zip' ) {
- if ( $this->isMatchingExtension( $ext, $mime ) ) {
- // A known file extension for an OPC file,
- // find the proper MIME type for that file extension
- $mime = $this->guessTypesForExtension( $ext );
- } else {
- wfDebug( __METHOD__ . ": refusing to guess better type for $mime file, " .
- ".$ext is not a known OPC extension.\n" );
- $mime = 'application/zip';
- }
- } elseif ( $mime === 'text/plain' && $this->findMediaType( ".$ext" ) === MEDIATYPE_TEXT ) {
- // Textual types are sometimes not recognized properly.
- // If detected as text/plain, and has an extension which is textual
- // improve to the extension's type. For example, csv and json are often
- // misdetected as text/plain.
- $mime = $this->guessTypesForExtension( $ext );
- }
-
- # Media handling extensions can improve the MIME detected
- Hooks::run( 'MimeMagicImproveFromExtension', [ $this, $ext, &$mime ] );
-
- if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
- $mime = $this->mMimeTypeAliases[$mime];
- }
-
- wfDebug( __METHOD__ . ": improved mime type for .$ext: $mime\n" );
- return $mime;
- }
-
- /**
- * MIME type detection. This uses detectMimeType to detect the MIME type
- * of the file, but applies additional checks to determine some well known
- * file formats that may be missed or misinterpreted by the default MIME
- * detection (namely XML based formats like XHTML or SVG, as well as ZIP
- * based formats like OPC/ODF files).
- *
- * @param string $file The file to check
- * @param string|bool $ext The file extension, or true (default) to extract it from the filename.
- * Set it to false to ignore the extension. DEPRECATED! Set to false, use
- * improveTypeFromExtension($mime, $ext) later to improve MIME type.
- *
- * @return string The MIME type of $file
- */
- public function guessMimeType( $file, $ext = true ) {
- if ( $ext ) { // TODO: make $ext default to false. Or better, remove it.
- wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " .
- "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
- }
-
- $mime = $this->doGuessMimeType( $file, $ext );
-
- if ( !$mime ) {
- wfDebug( __METHOD__ . ": internal type detection failed for $file (.$ext)...\n" );
- $mime = $this->detectMimeType( $file, $ext );
- }
-
- if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
- $mime = $this->mMimeTypeAliases[$mime];
- }
-
- wfDebug( __METHOD__ . ": guessed mime type of $file: $mime\n" );
- return $mime;
- }
-
- /**
- * Guess the MIME type from the file contents.
- *
- * @todo Remove $ext param
- *
- * @param string $file
- * @param mixed $ext
- * @return bool|string
- * @throws MWException
- */
- private function doGuessMimeType( $file, $ext ) {
- // Read a chunk of the file
- MediaWiki\suppressWarnings();
- $f = fopen( $file, 'rb' );
- MediaWiki\restoreWarnings();
-
- if ( !$f ) {
- return 'unknown/unknown';
- }
-
- $fsize = filesize( $file );
- if ( $fsize === false ) {
- return 'unknown/unknown';
- }
-
- $head = fread( $f, 1024 );
- $tailLength = min( 65558, $fsize ); // 65558 = maximum size of a zip EOCDR
- if ( fseek( $f, -1 * $tailLength, SEEK_END ) === -1 ) {
- throw new MWException(
- "Seeking $tailLength bytes from EOF failed in " . __METHOD__ );
- }
- $tail = $tailLength ? fread( $f, $tailLength ) : '';
- fclose( $f );
-
- wfDebug( __METHOD__ . ": analyzing head and tail of $file for magic numbers.\n" );
-
- // Hardcode a few magic number checks...
- $headers = [
- // Multimedia...
- 'MThd' => 'audio/midi',
- 'OggS' => 'application/ogg',
-
- // Image formats...
- // Note that WMF may have a bare header, no magic number.
- "\x01\x00\x09\x00" => 'application/x-msmetafile', // Possibly prone to false positives?
- "\xd7\xcd\xc6\x9a" => 'application/x-msmetafile',
- '%PDF' => 'application/pdf',
- 'gimp xcf' => 'image/x-xcf',
-
- // Some forbidden fruit...
- 'MZ' => 'application/octet-stream', // DOS/Windows executable
- "\xca\xfe\xba\xbe" => 'application/octet-stream', // Mach-O binary
- "\x7fELF" => 'application/octet-stream', // ELF binary
- ];
-
- foreach ( $headers as $magic => $candidate ) {
- if ( strncmp( $head, $magic, strlen( $magic ) ) == 0 ) {
- wfDebug( __METHOD__ . ": magic header in $file recognized as $candidate\n" );
- return $candidate;
- }
- }
-
- /* Look for WebM and Matroska files */
- if ( strncmp( $head, pack( "C4", 0x1a, 0x45, 0xdf, 0xa3 ), 4 ) == 0 ) {
- $doctype = strpos( $head, "\x42\x82" );
- if ( $doctype ) {
- // Next byte is datasize, then data (sizes larger than 1 byte are very stupid muxers)
- $data = substr( $head, $doctype + 3, 8 );
- if ( strncmp( $data, "matroska", 8 ) == 0 ) {
- wfDebug( __METHOD__ . ": recognized file as video/x-matroska\n" );
- return "video/x-matroska";
- } elseif ( strncmp( $data, "webm", 4 ) == 0 ) {
- wfDebug( __METHOD__ . ": recognized file as video/webm\n" );
- return "video/webm";
- }
- }
- wfDebug( __METHOD__ . ": unknown EBML file\n" );
- return "unknown/unknown";
- }
-
- /* Look for WebP */
- if ( strncmp( $head, "RIFF", 4 ) == 0 && strncmp( substr( $head, 8, 7 ), "WEBPVP8", 7 ) == 0 ) {
- wfDebug( __METHOD__ . ": recognized file as image/webp\n" );
- return "image/webp";
- }
-
- /**
- * Look for PHP. Check for this before HTML/XML... Warning: this is a
- * heuristic, and won't match a file with a lot of non-PHP before. It
- * will also match text files which could be PHP. :)
- *
- * @todo FIXME: For this reason, the check is probably useless -- an attacker
- * could almost certainly just pad the file with a lot of nonsense to
- * circumvent the check in any case where it would be a security
- * problem. On the other hand, it causes harmful false positives (bug
- * 16583). The heuristic has been cut down to exclude three-character
- * strings like "<? ", but should it be axed completely?
- */
- if ( ( strpos( $head, '<?php' ) !== false ) ||
- ( strpos( $head, "<\x00?\x00p\x00h\x00p" ) !== false ) ||
- ( strpos( $head, "<\x00?\x00 " ) !== false ) ||
- ( strpos( $head, "<\x00?\x00\n" ) !== false ) ||
- ( strpos( $head, "<\x00?\x00\t" ) !== false ) ||
- ( strpos( $head, "<\x00?\x00=" ) !== false ) ) {
-
- wfDebug( __METHOD__ . ": recognized $file as application/x-php\n" );
- return 'application/x-php';
- }
-
- /**
- * look for XML formats (XHTML and SVG)
- */
- $xml = new XmlTypeCheck( $file );
- if ( $xml->wellFormed ) {
- $xmlMimeTypes = $this->mConfig->get( 'XMLMimeTypes' );
- if ( isset( $xmlMimeTypes[$xml->getRootElement()] ) ) {
- return $xmlMimeTypes[$xml->getRootElement()];
- } else {
- return 'application/xml';
- }
- }
-
- /**
- * look for shell scripts
- */
- $script_type = null;
-
- # detect by shebang
- if ( substr( $head, 0, 2 ) == "#!" ) {
- $script_type = "ASCII";
- } elseif ( substr( $head, 0, 5 ) == "\xef\xbb\xbf#!" ) {
- $script_type = "UTF-8";
- } elseif ( substr( $head, 0, 7 ) == "\xfe\xff\x00#\x00!" ) {
- $script_type = "UTF-16BE";
- } elseif ( substr( $head, 0, 7 ) == "\xff\xfe#\x00!" ) {
- $script_type = "UTF-16LE";
- }
-
- if ( $script_type ) {
- if ( $script_type !== "UTF-8" && $script_type !== "ASCII" ) {
- // Quick and dirty fold down to ASCII!
- $pack = [ 'UTF-16BE' => 'n*', 'UTF-16LE' => 'v*' ];
- $chars = unpack( $pack[$script_type], substr( $head, 2 ) );
- $head = '';
- foreach ( $chars as $codepoint ) {
- if ( $codepoint < 128 ) {
- $head .= chr( $codepoint );
- } else {
- $head .= '?';
- }
- }
- }
-
- $match = [];
-
- if ( preg_match( '%/?([^\s]+/)(\w+)%', $head, $match ) ) {
- $mime = "application/x-{$match[2]}";
- wfDebug( __METHOD__ . ": shell script recognized as $mime\n" );
- return $mime;
- }
- }
-
- // Check for ZIP variants (before getimagesize)
- if ( strpos( $tail, "PK\x05\x06" ) !== false ) {
- wfDebug( __METHOD__ . ": ZIP header present in $file\n" );
- return $this->detectZipType( $head, $tail, $ext );
- }
-
- MediaWiki\suppressWarnings();
- $gis = getimagesize( $file );
- MediaWiki\restoreWarnings();
-
- if ( $gis && isset( $gis['mime'] ) ) {
- $mime = $gis['mime'];
- wfDebug( __METHOD__ . ": getimagesize detected $file as $mime\n" );
- return $mime;
- }
-
- // Also test DjVu
- $deja = new DjVuImage( $file );
- if ( $deja->isValid() ) {
- wfDebug( __METHOD__ . ": detected $file as image/vnd.djvu\n" );
- return 'image/vnd.djvu';
- }
-
- # Media handling extensions can guess the MIME by content
- # It's intentionally here so that if core is wrong about a type (false positive),
- # people will hopefully nag and submit patches :)
- $mime = false;
- # Some strings by reference for performance - assuming well-behaved hooks
- Hooks::run(
- 'MimeMagicGuessFromContent',
- [ $this, &$head, &$tail, $file, &$mime ]
+ wfDeprecated( __METHOD__, '1.28' );
+ // XXX: We know that the MimeAnalyzer is currently an instance of MimeMagic
+ $instance = MediaWikiServices::getInstance()->getMimeAnalyzer();
+ Assert::postcondition(
+ $instance instanceof MimeMagic,
+ __METHOD__ . ' should return an instance of ' . self::class
);
-
- return $mime;
- }
-
- /**
- * Detect application-specific file type of a given ZIP file from its
- * header data. Currently works for OpenDocument and OpenXML types...
- * If can't tell, returns 'application/zip'.
- *
- * @param string $header Some reasonably-sized chunk of file header
- * @param string|null $tail The tail of the file
- * @param string|bool $ext The file extension, or true to extract it from the filename.
- * Set it to false (default) to ignore the extension. DEPRECATED! Set to false,
- * use improveTypeFromExtension($mime, $ext) later to improve MIME type.
- *
- * @return string
- */
- function detectZipType( $header, $tail = null, $ext = false ) {
- if ( $ext ) { # TODO: remove $ext param
- wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " .
- "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
- }
-
- $mime = 'application/zip';
- $opendocTypes = [
- 'chart-template',
- 'chart',
- 'formula-template',
- 'formula',
- 'graphics-template',
- 'graphics',
- 'image-template',
- 'image',
- 'presentation-template',
- 'presentation',
- 'spreadsheet-template',
- 'spreadsheet',
- 'text-template',
- 'text-master',
- 'text-web',
- 'text' ];
-
- // http://lists.oasis-open.org/archives/office/200505/msg00006.html
- $types = '(?:' . implode( '|', $opendocTypes ) . ')';
- $opendocRegex = "/^mimetype(application\/vnd\.oasis\.opendocument\.$types)/";
-
- $openxmlRegex = "/^\[Content_Types\].xml/";
-
- if ( preg_match( $opendocRegex, substr( $header, 30 ), $matches ) ) {
- $mime = $matches[1];
- wfDebug( __METHOD__ . ": detected $mime from ZIP archive\n" );
- } elseif ( preg_match( $openxmlRegex, substr( $header, 30 ) ) ) {
- $mime = "application/x-opc+zip";
- # TODO: remove the block below, as soon as improveTypeFromExtension is used everywhere
- if ( $ext !== true && $ext !== false ) {
- // These MIME's are stored in the database, where we don't really want
- // x-opc+zip, because we use it only for internal purposes
- if ( $this->isMatchingExtension( $ext, $mime ) ) {
- /* A known file extension for an OPC file,
- * find the proper mime type for that file extension
- */
- $mime = $this->guessTypesForExtension( $ext );
- } else {
- $mime = "application/zip";
- }
- }
- wfDebug( __METHOD__ . ": detected an Open Packaging Conventions archive: $mime\n" );
- } elseif ( substr( $header, 0, 8 ) == "\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1" &&
- ( $headerpos = strpos( $tail, "PK\x03\x04" ) ) !== false &&
- preg_match( $openxmlRegex, substr( $tail, $headerpos + 30 ) ) ) {
- if ( substr( $header, 512, 4 ) == "\xEC\xA5\xC1\x00" ) {
- $mime = "application/msword";
- }
- switch ( substr( $header, 512, 6 ) ) {
- case "\xEC\xA5\xC1\x00\x0E\x00":
- case "\xEC\xA5\xC1\x00\x1C\x00":
- case "\xEC\xA5\xC1\x00\x43\x00":
- $mime = "application/vnd.ms-powerpoint";
- break;
- case "\xFD\xFF\xFF\xFF\x10\x00":
- case "\xFD\xFF\xFF\xFF\x1F\x00":
- case "\xFD\xFF\xFF\xFF\x22\x00":
- case "\xFD\xFF\xFF\xFF\x23\x00":
- case "\xFD\xFF\xFF\xFF\x28\x00":
- case "\xFD\xFF\xFF\xFF\x29\x00":
- case "\xFD\xFF\xFF\xFF\x10\x02":
- case "\xFD\xFF\xFF\xFF\x1F\x02":
- case "\xFD\xFF\xFF\xFF\x22\x02":
- case "\xFD\xFF\xFF\xFF\x23\x02":
- case "\xFD\xFF\xFF\xFF\x28\x02":
- case "\xFD\xFF\xFF\xFF\x29\x02":
- $mime = "application/vnd.msexcel";
- break;
- }
-
- wfDebug( __METHOD__ . ": detected a MS Office document with OPC trailer\n" );
- } else {
- wfDebug( __METHOD__ . ": unable to identify type of ZIP archive\n" );
- }
- return $mime;
- }
-
- /**
- * Internal MIME type detection. Detection is done using an external
- * program, if $wgMimeDetectorCommand is set. Otherwise, the fileinfo
- * extension is tried if it is available. If detection fails and $ext
- * is not false, the MIME type is guessed from the file extension,
- * using guessTypesForExtension.
- *
- * If the MIME type is still unknown, getimagesize is used to detect the
- * MIME type if the file is an image. If no MIME type can be determined,
- * this function returns 'unknown/unknown'.
- *
- * @param string $file The file to check
- * @param string|bool $ext The file extension, or true (default) to extract it from the filename.
- * Set it to false to ignore the extension. DEPRECATED! Set to false, use
- * improveTypeFromExtension($mime, $ext) later to improve MIME type.
- *
- * @return string The MIME type of $file
- */
- private function detectMimeType( $file, $ext = true ) {
- /** @todo Make $ext default to false. Or better, remove it. */
- if ( $ext ) {
- wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. "
- . "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
- }
-
- $mimeDetectorCommand = $this->mConfig->get( 'MimeDetectorCommand' );
- $m = null;
- if ( $mimeDetectorCommand ) {
- $args = wfEscapeShellArg( $file );
- $m = wfShellExec( "$mimeDetectorCommand $args" );
- } elseif ( function_exists( "finfo_open" ) && function_exists( "finfo_file" ) ) {
- $mime_magic_resource = finfo_open( FILEINFO_MIME );
-
- if ( $mime_magic_resource ) {
- $m = finfo_file( $mime_magic_resource, $file );
- finfo_close( $mime_magic_resource );
- } else {
- wfDebug( __METHOD__ . ": finfo_open failed on " . FILEINFO_MIME . "!\n" );
- }
- } else {
- wfDebug( __METHOD__ . ": no magic mime detector found!\n" );
- }
-
- if ( $m ) {
- # normalize
- $m = preg_replace( '![;, ].*$!', '', $m ); # strip charset, etc
- $m = trim( $m );
- $m = strtolower( $m );
-
- if ( strpos( $m, 'unknown' ) !== false ) {
- $m = null;
- } else {
- wfDebug( __METHOD__ . ": magic mime type of $file: $m\n" );
- return $m;
- }
- }
-
- // If desired, look at extension as a fallback.
- if ( $ext === true ) {
- $i = strrpos( $file, '.' );
- $ext = strtolower( $i ? substr( $file, $i + 1 ) : '' );
- }
- if ( $ext ) {
- if ( $this->isRecognizableExtension( $ext ) ) {
- wfDebug( __METHOD__ . ": refusing to guess mime type for .$ext file, "
- . "we should have recognized it\n" );
- } else {
- $m = $this->guessTypesForExtension( $ext );
- if ( $m ) {
- wfDebug( __METHOD__ . ": extension mime type of $file: $m\n" );
- return $m;
- }
- }
- }
-
- // Unknown type
- wfDebug( __METHOD__ . ": failed to guess mime type for $file!\n" );
- return 'unknown/unknown';
- }
-
- /**
- * Determine the media type code for a file, using its MIME type, name and
- * possibly its contents.
- *
- * This function relies on the findMediaType(), mapping extensions and MIME
- * types to media types.
- *
- * @todo analyse file if need be
- * @todo look at multiple extension, separately and together.
- *
- * @param string $path Full path to the image file, in case we have to look at the contents
- * (if null, only the MIME type is used to determine the media type code).
- * @param string $mime MIME type. If null it will be guessed using guessMimeType.
- *
- * @return string A value to be used with the MEDIATYPE_xxx constants.
- */
- function getMediaType( $path = null, $mime = null ) {
- if ( !$mime && !$path ) {
- return MEDIATYPE_UNKNOWN;
- }
-
- // If MIME type is unknown, guess it
- if ( !$mime ) {
- $mime = $this->guessMimeType( $path, false );
- }
-
- // Special code for ogg - detect if it's video (theora),
- // else label it as sound.
- if ( $mime == 'application/ogg' && file_exists( $path ) ) {
-
- // Read a chunk of the file
- $f = fopen( $path, "rt" );
- if ( !$f ) {
- return MEDIATYPE_UNKNOWN;
- }
- $head = fread( $f, 256 );
- fclose( $f );
-
- $head = str_replace( 'ffmpeg2theora', '', strtolower( $head ) );
-
- // This is an UGLY HACK, file should be parsed correctly
- if ( strpos( $head, 'theora' ) !== false ) {
- return MEDIATYPE_VIDEO;
- } elseif ( strpos( $head, 'vorbis' ) !== false ) {
- return MEDIATYPE_AUDIO;
- } elseif ( strpos( $head, 'flac' ) !== false ) {
- return MEDIATYPE_AUDIO;
- } elseif ( strpos( $head, 'speex' ) !== false ) {
- return MEDIATYPE_AUDIO;
- } else {
- return MEDIATYPE_MULTIMEDIA;
- }
- }
-
- $type = null;
- // Check for entry for full MIME type
- if ( $mime ) {
- $type = $this->findMediaType( $mime );
- if ( $type !== MEDIATYPE_UNKNOWN ) {
- return $type;
- }
- }
-
- // Check for entry for file extension
- if ( $path ) {
- $i = strrpos( $path, '.' );
- $e = strtolower( $i ? substr( $path, $i + 1 ) : '' );
-
- // TODO: look at multi-extension if this fails, parse from full path
- $type = $this->findMediaType( '.' . $e );
- if ( $type !== MEDIATYPE_UNKNOWN ) {
- return $type;
- }
- }
-
- // Check major MIME type
- if ( $mime ) {
- $i = strpos( $mime, '/' );
- if ( $i !== false ) {
- $major = substr( $mime, 0, $i );
- $type = $this->findMediaType( $major );
- if ( $type !== MEDIATYPE_UNKNOWN ) {
- return $type;
- }
- }
- }
-
- if ( !$type ) {
- $type = MEDIATYPE_UNKNOWN;
- }
-
- return $type;
- }
-
- /**
- * Returns a media code matching the given MIME type or file extension.
- * File extensions are represented by a string starting with a dot (.) to
- * distinguish them from MIME types.
- *
- * This function relies on the mapping defined by $this->mMediaTypes
- * @access private
- * @param string $extMime
- * @return int|string
- */
- function findMediaType( $extMime ) {
- if ( strpos( $extMime, '.' ) === 0 ) {
- // If it's an extension, look up the MIME types
- $m = $this->getTypesForExtension( substr( $extMime, 1 ) );
- if ( !$m ) {
- return MEDIATYPE_UNKNOWN;
- }
-
- $m = explode( ' ', $m );
- } else {
- // Normalize MIME type
- if ( isset( $this->mMimeTypeAliases[$extMime] ) ) {
- $extMime = $this->mMimeTypeAliases[$extMime];
- }
-
- $m = [ $extMime ];
- }
-
- foreach ( $m as $mime ) {
- foreach ( $this->mMediaTypes as $type => $codes ) {
- if ( in_array( $mime, $codes, true ) ) {
- return $type;
- }
- }
- }
-
- return MEDIATYPE_UNKNOWN;
- }
-
- /**
- * Get the MIME types that various versions of Internet Explorer would
- * detect from a chunk of the content.
- *
- * @param string $fileName The file name (unused at present)
- * @param string $chunk The first 256 bytes of the file
- * @param string $proposed The MIME type proposed by the server
- * @return array
- */
- public function getIEMimeTypes( $fileName, $chunk, $proposed ) {
- $ca = $this->getIEContentAnalyzer();
- return $ca->getRealMimesFromData( $fileName, $chunk, $proposed );
- }
-
- /**
- * Get a cached instance of IEContentAnalyzer
- *
- * @return IEContentAnalyzer
- */
- protected function getIEContentAnalyzer() {
- if ( is_null( $this->mIEAnalyzer ) ) {
- $this->mIEAnalyzer = new IEContentAnalyzer;
- }
- return $this->mIEAnalyzer;
+ return $instance;
}
}
dépôts / lhc / web / wiklou.git / blobdiff