Map of MIME types to file extensions */ protected $mimeToExts = []; /** @var array Map of file extensions to MIME types */ protected $extToMimes = []; /** @var array Map of file extensions types to MIME types (as a space separated list) */ public $mExtToMime = []; // legacy name; field accessed by hooks /** @var IEContentAnalyzer */ protected $IEAnalyzer; /** @var string Extra MIME types, set for example by media handling extensions */ private $extraTypes = ''; /** @var string Extra MIME info, set for example by media handling extensions */ private $extraInfo = ''; /** @var LoggerInterface */ private $logger; /** @var string Use the full, built-in MIME mapping rather than load from a file */ public const USE_INTERNAL = 'internal'; /** * @param array $params Configuration map, includes: * - typeFile: path to file with the list of known MIME types * - infoFile: path to file with the MIME type info * - xmlTypes: map of root element names to XML MIME types * - initCallback: initialization callback that is passed this object [optional] * - detectCallback: alternative to finfo that returns the mime type for a file. * For example, the callback can return the output of "file -bi". [optional] * - guessCallback: callback to improve the guessed MIME type using the file data. * This is intended for fixing mistakes in fileinfo or "detectCallback". [optional] * - extCallback: callback to improve the guessed MIME type using the extension. [optional] * - logger: PSR-3 logger [optional] * @note Constructing these instances is expensive due to file reads. * A service or singleton pattern should be used to avoid creating instances again and again. */ public function __construct( array $params ) { $this->typeFile = $params['typeFile']; $this->infoFile = $params['infoFile']; $this->xmlTypes = $params['xmlTypes']; $this->initCallback = $params['initCallback'] ?? null; $this->detectCallback = $params['detectCallback'] ?? null; $this->guessCallback = $params['guessCallback'] ?? null; $this->extCallback = $params['extCallback'] ?? null; $this->logger = $params['logger'] ?? new NullLogger(); $this->loadFiles(); } protected function loadFiles() { # Allow media handling extensions adding MIME-types and MIME-info if ( $this->initCallback ) { call_user_func( $this->initCallback, $this ); } $rawTypes = $this->extraTypes; if ( $this->typeFile === self::USE_INTERNAL ) { $this->mimeToExts = MimeMap::MIME_EXTENSIONS; } else { $this->mimeToExts = MimeMapMinimal::MIME_EXTENSIONS; if ( $this->typeFile ) { $rawTypes = file_get_contents( $this->typeFile ) . "\n" . $this->extraTypes; } } if ( $rawTypes ) { $this->parseMimeTypes( $rawTypes ); } // Build the reverse mapping (extension => MIME type). foreach ( $this->mimeToExts as $mime => $exts ) { foreach ( $exts as $ext ) { $this->extToMimes[$ext][] = $mime; } } // Migrate items from the legacy $this->mExtToMime field. // TODO: Remove this when mExtToMime is finally removed. foreach ( $this->mExtToMime as $ext => $mimes ) { foreach ( explode( ' ', $mimes ) as $mime ) { $this->extToMimes[$ext][] = $mime; } } $rawInfo = $this->extraInfo; if ( $this->infoFile === self::USE_INTERNAL ) { $this->mimeTypeAliases = MimeMap::MIME_TYPE_ALIASES; $this->mediaTypes = MimeMap::MEDIA_TYPES; } else { $this->mimeTypeAliases = MimeMapMinimal::MIME_TYPE_ALIASES; $this->mediaTypes = MimeMapMinimal::MEDIA_TYPES; if ( $this->infoFile ) { $rawInfo = file_get_contents( $this->infoFile ) . "\n" . $this->extraInfo; } } if ( $rawInfo ) { $this->parseMimeInfo( $rawInfo ); } } protected function parseMimeTypes( $rawMimeTypes ) { $rawMimeTypes = str_replace( [ "\r\n", "\n\r", "\n\n", "\r\r", "\r" ], "\n", $rawMimeTypes ); $rawMimeTypes = str_replace( "\t", " ", $rawMimeTypes ); $lines = explode( "\n", $rawMimeTypes ); 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; } $tokens = preg_split( '/\s+/', $s, -1, PREG_SPLIT_NO_EMPTY ); if ( count( $tokens ) > 1 ) { $mime = array_shift( $tokens ); $this->mimeToExts[$mime] = array_values( array_unique( array_merge( $this->mimeToExts[$mime] ?? [], $tokens ) ) ); } } } protected function parseMimeInfo( $rawMimeInfo ) { $rawMimeInfo = str_replace( [ "\r\n", "\n\r", "\n\n", "\r\r", "\r" ], "\n", $rawMimeInfo ); $rawMimeInfo = str_replace( "\t", " ", $rawMimeInfo ); $lines = explode( "\n", $rawMimeInfo ); 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
"; $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 = preg_split( '/\s+/', $s, -1, PREG_SPLIT_NO_EMPTY ); if ( !isset( $this->mediaTypes[$mtype] ) ) { $this->mediaTypes[$mtype] = []; } foreach ( $m as $mime ) { $mime = trim( $mime ); if ( empty( $mime ) ) { continue; } $this->mediaTypes[$mtype][] = $mime; } if ( count( $m ) > 1 ) { $main = $m[0]; $mCount = count( $m ); for ( $i = 1; $i < $mCount; $i += 1 ) { $mime = $m[$i]; $this->mimeTypeAliases[$mime] = $main; } } } } public function setLogger( LoggerInterface $logger ) { $this->logger = $logger; } /** * 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 MimeMap.php. * @param string $types */ public function addExtraTypes( $types ) { $this->extraTypes .= "\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 MimeMap.php. * @param string $info */ public function addExtraInfo( $info ) { $this->extraInfo .= "\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. * * @deprecated since 1.35 Use getExtensionsFromMimeType() instead. * @param string $mime * @return string|null */ public function getExtensionsForType( $mime ) { $exts = $this->getExtensionsFromMimeType( $mime ); return $exts ? implode( ' ', $exts ) : null; } /** * Returns an array of file extensions associated with a given MIME type. * The returned array is empty if the MIME type was unrecognized. Resolves * MIME type aliases. * * @since 1.35 * @param string $mime * @return array */ public function getExtensionsFromMimeType( $mime ) { $mime = strtolower( $mime ); if ( !isset( $this->mimeToExts[$mime] ) && isset( $this->mimeTypeAliases[$mime] ) ) { $mime = $this->mimeTypeAliases[$mime]; } return $this->mimeToExts[$mime] ?? []; } /** * Returns an array of MIME types associated with a given file extension. * The returned array is empty if the file extension is not associated with * any MIME types. * * @since 1.35 * @param string $ext * @return array */ public function getMimeTypesFromExtension( $ext ) { $ext = strtolower( $ext ); return $this->extToMimes[$ext] ?? []; } /** * 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 getMimeTypesFromExtension($ext). * * @since 1.35 * @param string $ext * @return string|null */ public function getMimeTypeFromExtensionOrNull( $ext ) { $types = $this->getMimeTypesFromExtension( $ext ); return $types[0] ?? null; } /** * Returns a single file extension for a given MIME type or null if unknown. * This is always the first type from the list returned by getExtensionsFromMimeType($mime). * * @deprecated since 1.35 Use getMimeTypeFromExtensionOrNull() instead. * @param string $ext * @return string|null */ public function guessTypesForExtension( $ext ) { return $this->getMimeTypeFromExtensionOrNull( $ext ); } /** * Returns a list of MIME types for a given file extension as a space * separated string or null if the extension was unrecognized. * * @deprecated since 1.35 Use getMimeTypesFromExtension() instead. * @param string $ext * @return string|null */ public function getTypesForExtension( $ext ) { $types = $this->getMimeTypesFromExtension( $ext ); return $types ? implode( ' ', $types ) : null; } /** * Returns a single file extension for a given MIME type or null if unknown. * This is always the first type from the list returned by getExtensionsFromMimeType($mime). * * @since 1.35 * @param string $mime * @return string|null */ public function getExtensionFromMimeTypeOrNull( $mime ) { $exts = $this->getExtensionsFromMimeType( $mime ); return $exts[0] ?? null; } /** * 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 ) { $exts = $this->getExtensionsFromMimeType( $mime ); if ( !$exts ) { return null; // Unknown MIME type } return in_array( strtolower( $extension ), $exts ); } /** * 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 */ public 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', 'opus', 'mid', 'pdf', 'wmf', 'xcf', 'webm', 'mkv', 'mka', 'webp', 'mp3', // XML formats we sure hope we recognize reliably 'svg', // 3D formats 'stl', ]; 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(). * * XXX: Null-returning behavior is probably an accident and definitely confusing (T253483). * * @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|null The improved MIME type, or null if the MIME type is * unknown/unknown and the extension is not recognized. */ public function improveTypeFromExtension( $mime, $ext ) { if ( $mime === 'unknown/unknown' ) { if ( $this->isRecognizableExtension( $ext ) ) { $this->logger->info( __METHOD__ . ': refusing to guess mime type for .' . "$ext file, we should have recognized it\n" ); } else { // Not something we can detect, so simply // trust the file extension $mime = $this->getMimeTypeFromExtensionOrNull( $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->getMimeTypeFromExtensionOrNull( $ext ); } else { $this->logger->info( __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->getMimeTypeFromExtensionOrNull( $ext ); } # Media handling extensions can improve the MIME detected $callback = $this->extCallback; if ( $callback ) { $callback( $this, $ext, $mime /* by reference */ ); } if ( isset( $this->mimeTypeAliases[$mime] ) ) { $mime = $this->mimeTypeAliases[$mime]; } $this->logger->info( __METHOD__ . ": improved mime type for .$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. $this->logger->info( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " . "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" ); } $mime = $this->doGuessMimeType( $file, $ext ); if ( !$mime ) { $this->logger->info( __METHOD__ . ": internal type detection failed for $file (.$ext)...\n" ); $mime = $this->detectMimeType( $file, $ext ); } if ( isset( $this->mimeTypeAliases[$mime] ) ) { $mime = $this->mimeTypeAliases[$mime]; } $this->logger->info( __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 UnexpectedValueException */ private function doGuessMimeType( $file, $ext ) { // Read a chunk of the file Wikimedia\suppressWarnings(); $f = fopen( $file, 'rb' ); Wikimedia\restoreWarnings(); if ( !$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 UnexpectedValueException( "Seeking $tailLength bytes from EOF failed in " . __METHOD__ ); } $tail = $tailLength ? fread( $f, $tailLength ) : ''; $this->logger->info( __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', 'ID3' => 'audio/mpeg', "\xff\xfb" => 'audio/mpeg', // MPEG-1 layer 3 "\xff\xf3" => 'audio/mpeg', // MPEG-2 layer 3 (lower sample rates) "\xff\xe3" => 'audio/mpeg', // MPEG-2.5 layer 3 (very low sample rates) // 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 ) { $this->logger->info( __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 stupid muxers) $data = substr( $head, $doctype + 3, 8 ); if ( strncmp( $data, "matroska", 8 ) == 0 ) { $this->logger->info( __METHOD__ . ": recognized file as video/x-matroska\n" ); return "video/x-matroska"; } elseif ( strncmp( $data, "webm", 4 ) == 0 ) { // XXX HACK look for a video track, if we don't find it, this is an audio file $videotrack = strpos( $head, "\x86\x85V_VP" ); if ( $videotrack ) { // There is a video track, so this is a video file. $this->logger->info( __METHOD__ . ": recognized file as video/webm\n" ); return "video/webm"; } $this->logger->info( __METHOD__ . ": recognized file as audio/webm\n" ); return "audio/webm"; } } $this->logger->info( __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 ) { $this->logger->info( __METHOD__ . ": recognized file as image/webp\n" ); return "image/webp"; } /* Look for MS Compound Binary (OLE) files */ if ( strncmp( $head, "\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1", 8 ) == 0 ) { $this->logger->info( __METHOD__ . ': recognized MS CFB (OLE) file' ); return $this->detectMicrosoftBinaryType( $f ); } /** * 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 "logger->info( __METHOD__ . ": recognized $file as application/x-php\n" ); return 'application/x-php'; } /** * look for XML formats (XHTML and SVG) */ Wikimedia\suppressWarnings(); $xml = new XmlTypeCheck( $file ); Wikimedia\restoreWarnings(); if ( $xml->wellFormed ) { $xmlTypes = $this->xmlTypes; return $xmlTypes[$xml->getRootElement()] ?? '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]}"; $this->logger->info( __METHOD__ . ": shell script recognized as $mime\n" ); return $mime; } } // Check for ZIP variants (before getimagesize) $eocdrPos = strpos( $tail, "PK\x05\x06" ); if ( $eocdrPos !== false && $eocdrPos <= strlen( $tail ) - 22 ) { $this->logger->info( __METHOD__ . ": ZIP signature present in $file\n" ); // Check if it really is a ZIP file, make sure the EOCDR is at the end (T40432) $commentLength = unpack( "n", substr( $tail, $eocdrPos + 20 ) )[1]; if ( $eocdrPos + 22 + $commentLength !== strlen( $tail ) ) { $this->logger->info( __METHOD__ . ": ZIP EOCDR not at end. Not a ZIP file." ); } else { return $this->detectZipType( $head, $tail, $ext ); } } // Check for STL (3D) files // @see https://en.wikipedia.org/wiki/STL_(file_format) if ( $fsize >= 15 && stripos( $head, 'SOLID ' ) === 0 && preg_match( '/\RENDSOLID .*$/i', $tail ) ) { // ASCII STL file return 'application/sla'; } elseif ( $fsize > 84 ) { // binary STL file $triangles = substr( $head, 80, 4 ); $triangles = unpack( 'V', $triangles ); $triangles = reset( $triangles ); if ( $triangles !== false && $fsize === 84 + ( $triangles * 50 ) ) { return 'application/sla'; } } Wikimedia\suppressWarnings(); $gis = getimagesize( $file ); Wikimedia\restoreWarnings(); if ( $gis && isset( $gis['mime'] ) ) { $mime = $gis['mime']; $this->logger->info( __METHOD__ . ": getimagesize detected $file as $mime\n" ); return $mime; } # 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 $callback = $this->guessCallback; if ( $callback ) { $callback( $this, $head, $tail, $file, $mime /* by reference */ ); } 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 */ public function detectZipType( $header, $tail = null, $ext = false ) { if ( $ext ) { # TODO: remove $ext param $this->logger->info( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " . "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" ); } $mime = 'application/zip'; $opendocTypes = [ # In OASIS Open Document Format v1.2, Database front end document # has a recommended MIME type of: # application/vnd.oasis.opendocument.base # Despite the type registered at the IANA being 'database' which is # supposed to be normative. # T35515 'base', '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' ]; // The list of document types is available in OASIS Open Document // Format version 1.2 under Appendix C. It is not normative though, // supposedly types registered at the IANA should be. // http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.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]; $this->logger->info( __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 ) { /** This is the mode used by getPropsFromPath * 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->getMimeTypeFromExtensionOrNull( $ext ); } else { $mime = "application/zip"; } } $this->logger->info( __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; } $this->logger->info( __METHOD__ . ": detected a MS Office document with OPC trailer\n" ); } else { $this->logger->info( __METHOD__ . ": unable to identify type of ZIP archive\n" ); } return $mime; } /** * Detect the type of a Microsoft Compound Binary a.k.a. OLE file. * These are old style pre-ODF files such as .doc and .xls * * @param resource $handle An opened seekable file handle * @return string The detected MIME type */ private function detectMicrosoftBinaryType( $handle ) { $info = MSCompoundFileReader::readHandle( $handle ); if ( !$info['valid'] ) { $this->logger->info( __METHOD__ . ': invalid file format' ); return 'unknown/unknown'; } if ( !$info['mime'] ) { $this->logger->info( __METHOD__ . ": unrecognised document subtype" ); return 'unknown/unknown'; } return $info['mime']; } /** * Internal MIME type detection. Detection is done using the fileinfo * extension if it is available. It can be overriden by callback, which could * use an external program, for example. If detection fails and $ext is not false, * the MIME type is guessed from the file extension, using getMimeTypeFromExtensionOrNull. * * 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 ) { $this->logger->info( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " . "Use improveTypeFromExtension(\$mime, \$ext) instead.\n" ); } $callback = $this->detectCallback; $m = null; if ( $callback ) { $m = $callback( $file ); } else { $m = mime_content_type( $file ); } if ( $m ) { # normalize $m = preg_replace( '![;, ].*$!', '', $m ); # strip charset, etc $m = trim( $m ); $m = strtolower( $m ); if ( strpos( $m, 'unknown' ) !== false ) { $m = null; } else { $this->logger->info( __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 ) ) { $this->logger->info( __METHOD__ . ": refusing to guess mime type for .$ext file, " . "we should have recognized it\n" ); } else { $m = $this->getMimeTypeFromExtensionOrNull( $ext ); if ( $m ) { $this->logger->info( __METHOD__ . ": extension mime type of $file: $m\n" ); return $m; } } } // Unknown type $this->logger->info( __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|null $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|null $mime MIME type. If null it will be guessed using guessMimeType. * * @return string A value to be used with the MEDIATYPE_xxx constants. */ public 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' && is_string( $path ) && 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; } elseif ( strpos( $head, 'opus' ) !== 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 * @internal * @param string $extMime * @return int|string */ public 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( $this->mimeTypeAliases[$extMime] ) ) { $extMime = $this->mimeTypeAliases[$extMime]; } $m = [ $extMime ]; } foreach ( $m as $mime ) { foreach ( $this->mediaTypes as $type => $codes ) { if ( in_array( $mime, $codes, true ) ) { return $type; } } } return MEDIATYPE_UNKNOWN; } /** * Returns an array of media types (MEDIATYPE_xxx constants) * * @return array */ public function getMediaTypes() { return array_keys( $this->mediaTypes ); } /** * 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 ( $this->IEAnalyzer === null ) { $this->IEAnalyzer = new IEContentAnalyzer; } return $this->IEAnalyzer; } }