X-Git-Url: https://git.heureux-cyclage.org/?p=lhc%2Fweb%2Fwiklou.git;a=blobdiff_plain;f=includes%2FMimeMagic.php;h=f062d13514fa50cbd6ae6e97fc65df1198964841;hp=54d58d2d4423e84a7da45413e8748b094010e5ee;hb=7507172e95721c6193d574e461f75dae1ff1d0f0;hpb=703fe3378f2007a79374eb5cee0b6854f3705510 diff --git a/includes/MimeMagic.php b/includes/MimeMagic.php index 54d58d2d44..6152d2262f 100644 --- a/includes/MimeMagic.php +++ b/includes/MimeMagic.php @@ -1,7 +1,5 @@ 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', <<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
"; - - $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 "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; } }