mMimeToExt = array(); $this->mToMime = array(); $lines = explode( "\n",$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; #print "processing MIME line $s
"; $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 --- */ global $wgMimeInfoFile; if ( $wgMimeInfoFile == 'includes/mime.info' ) { $wgMimeInfoFile = "$IP/$wgMimeInfoFile"; } $info = MM_WELL_KNOWN_MIME_INFO; if ( $wgMimeInfoFile ) { if ( is_file( $wgMimeInfoFile ) and is_readable( $wgMimeInfoFile ) ) { wfDebug( __METHOD__.": loading mime info from $wgMimeInfoFile\n" ); $info .= "\n"; $info .= file_get_contents( $wgMimeInfoFile ); } else { wfDebug(__METHOD__.": can't load mime info from $wgMimeInfoFile\n"); } } else { wfDebug(__METHOD__.": no mime info file defined, using build-ins only.\n"); } $info = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $info); $info = str_replace( "\t", " ", $info ); $this->mMimeTypeAliases = array(); $this->mMediaTypes = array(); $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 = array(); 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] = array(); } foreach ( $m as $mime ) { $mime = trim( $mime ); if ( empty( $mime ) ) continue; $this->mMediaTypes[$mtype][] = $mime; } if ( sizeof( $m ) > 1 ) { $main = $m[0]; for ( $i=1; $imMimeTypeAliases[$mime] = $main; } } } } /** * Get an instance of this class */ static function &singleton() { if ( !isset( self::$instance ) ) { self::$instance = new MimeMagic; } return self::$instance; } /** returns a list of file extensions for a given mime type * as a space separated string. */ function getExtensionsForType( $mime ) { $mime = strtolower( $mime ); $r = @$this->mMimeToExt[$mime]; if ( @!$r and isset( $this->mMimeTypeAliases[$mime] ) ) { $mime = $this->mMimeTypeAliases[$mime]; $r = @$this->mMimeToExt[$mime]; } return $r; } /** returns a list of mime types for a given file extension * as a space separated string. */ function getTypesForExtension( $ext ) { $ext = strtolower( $ext ); $r = isset( $this->mExtToMime[$ext] ) ? $this->mExtToMime[$ext] : null; return $r; } /** returns a single mime type for a given file extension. * This is always the first type from the list returned by getTypesForExtension($ext). */ function guessTypesForExtension( $ext ) { $m = $this->getTypesForExtension( $ext ); if ( is_null( $m ) ) return NULL; $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. */ function isMatchingExtension( $extension, $mime ) { $ext = $this->getExtensionsForType( $mime ); if ( !$ext ) { return NULL; //unknown } $ext = explode( ' ', $ext ); $extension = strtolower( $extension ); if ( in_array( $extension, $ext ) ) { return true; } return false; } /** returns true if the mime type is known to represent * an image format supported by the PHP GD library. */ function isPHPImageType( $mime ) { #as defined by imagegetsize and image_type_to_mime static $types = array( '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. * @return bool */ function isRecognizableExtension( $extension ) { static $types = array( 'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd', 'bmp', 'tiff', 'tif', 'jpc', 'jp2', 'jpx', 'jb2', 'swc', 'iff', 'wbmp', 'xbm', 'djvu' ); return in_array( strtolower( $extension ), $types ); } /** 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 misinterpreter by the default mime detection (namely xml based formats like XHTML or SVG). * * @param string $file The file to check * @param mixed $ext The file extension, or true to extract it from the filename. * Set it to false to ignore the extension. * * @return string the mime type of $file */ function guessMimeType( $file, $ext = true ) { $mime = $this->detectMimeType( $file, $ext ); // Read a chunk of the file wfSuppressWarnings(); $f = fopen( $file, "rt" ); wfRestoreWarnings(); if( !$f ) return "unknown/unknown"; $head = fread( $f, 1024 ); fclose( $f ); $sub4 = substr( $head, 0, 4 ); if ( $sub4 == "\x01\x00\x09\x00" || $sub4 == "\xd7\xcd\xc6\x9a" ) { // WMF kill kill kill // Note that WMF may have a bare header, no magic number. // The former of the above two checks is theoretically prone to false positives $mime = "application/x-msmetafile"; } if ( strpos( $mime, "text/" ) === 0 || $mime === "application/xml" ) { $xml_type = NULL; $script_type = NULL; /* * look for XML formats (XHTML and SVG) */ if ($mime === "text/sgml" || $mime === "text/plain" || $mime === "text/html" || $mime === "text/xml" || $mime === "application/xml") { if ( substr( $head, 0, 5 ) == "%sim', $head, $match ) ) { $doctype = $match[1]; } if ( preg_match( '%<(\w+).*>%sim', $head, $match ) ) { $tag = $match[1]; } #print "
ANALYSING $file ($mime): doctype= $doctype; tag= $tag
"; if ( strpos( $doctype, "-//W3C//DTD SVG" ) === 0 ) { $mime = "image/svg+xml"; } elseif ( $tag === "svg" ) { $mime = "image/svg+xml"; } elseif ( strpos( $doctype, "-//W3C//DTD XHTML" ) === 0 ) { $mime = "text/html"; } elseif ( $tag === "html" ) { $mime = "text/html"; } } } /* * look for shell scripts */ if ( !$xml_type ) { $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") { $head = iconv( $script_type, "ASCII//IGNORE", $head); } $match = array(); if ( preg_match( '%/?([^\s]+/)(\w+)%', $head, $match ) ) { $mime = "application/x-{$match[2]}"; } } } /* * look for PHP */ if( !$xml_type && !$script_type ) { if( ( strpos( $head, 'mMimeTypeAliases[$mime] ) ) { $mime = $this->mMimeTypeAliases[$mime]; } wfDebug(__METHOD__.": final mime type of $file: $mime\n"); return $mime; } /** Internal mime type detection, please use guessMimeType() for application code instead. * Detection is done using an external program, if $wgMimeDetectorCommand is set. * Otherwise, the fileinfo extension and mime_content_type are tried (in this order), if they are available. * If the dections 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 mixed $ext The file extension, or true to extract it from the filename. * Set it to false to ignore the extension. * * @return string the mime type of $file * @access private */ function detectMimeType( $file, $ext = true ) { global $wgMimeDetectorCommand; $m = NULL; if ( $wgMimeDetectorCommand ) { $fn = wfEscapeShellArg( $file ); $m = `$wgMimeDetectorCommand $fn`; } elseif ( function_exists( "finfo_open" ) && function_exists( "finfo_file" ) ) { # This required the fileinfo extension by PECL, # see http://pecl.php.net/package/fileinfo # This must be compiled into PHP # # finfo is the official replacement for the deprecated # mime_content_type function, see below. # # If you may need to load the fileinfo extension at runtime, set # $wgLoadFileinfoExtension in LocalSettings.php $mime_magic_resource = finfo_open(FILEINFO_MIME); /* return mime type ala mimetype extension */ if ($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" ); } } elseif ( function_exists( "mime_content_type" ) ) { # NOTE: this function is available since PHP 4.3.0, but only if # PHP was compiled with --with-mime-magic or, before 4.3.2, with --enable-mime-magic. # # On Windows, you must set mime_magic.magicfile in php.ini to point to the mime.magic file bundeled with PHP; # sometimes, this may even be needed under linus/unix. # # Also note that this has been DEPRECATED in favor of the fileinfo extension by PECL, see above. # see http://www.php.net/manual/en/ref.mime-magic.php for details. $m = mime_content_type($file); if ( $m == 'text/plain' ) { // mime_content_type sometimes considers DJVU files to be text/plain. $deja = new DjVuImage( $file ); if( $deja->isValid() ) { wfDebug( __METHOD__.": (re)detected $file as image/vnd.djvu\n" ); $m = 'image/vnd.djvu'; } } } 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 still not known, use getimagesize to find out the type of image # TODO: skip things that do not have a well-known image extension? Would that be safe? wfSuppressWarnings(); $gis = getimagesize( $file ); wfRestoreWarnings(); $notAnImage = false; if ( $gis && is_array($gis) && $gis[2] ) { switch ( $gis[2] ) { case IMAGETYPE_GIF: $m = "image/gif"; break; case IMAGETYPE_JPEG: $m = "image/jpeg"; break; case IMAGETYPE_PNG: $m = "image/png"; break; case IMAGETYPE_SWF: $m = "application/x-shockwave-flash"; break; case IMAGETYPE_PSD: $m = "application/photoshop"; break; case IMAGETYPE_BMP: $m = "image/bmp"; break; case IMAGETYPE_TIFF_II: $m = "image/tiff"; break; case IMAGETYPE_TIFF_MM: $m = "image/tiff"; break; case IMAGETYPE_JPC: $m = "image"; break; case IMAGETYPE_JP2: $m = "image/jpeg2000"; break; case IMAGETYPE_JPX: $m = "image/jpeg2000"; break; case IMAGETYPE_JB2: $m = "image"; break; case IMAGETYPE_SWC: $m = "application/x-shockwave-flash"; break; case IMAGETYPE_IFF: $m = "image/vnd.xiff"; break; case IMAGETYPE_WBMP: $m = "image/vnd.wap.wbmp"; break; case IMAGETYPE_XBM: $m = "image/x-xbitmap"; break; } if ( $m ) { wfDebug( __METHOD__.": image mime type of $file: $m\n" ); return $m; } else { $notAnImage = true; } } else { // Also test DjVu $deja = new DjVuImage( $file ); if( $deja->isValid() ) { wfDebug( __METHOD__.": detected $file as image/vnd.djvu\n" ); return 'image/vnd.djvu'; } } # if desired, look at extension as a fallback. if ( $ext === true ) { $i = strrpos( $file, '.' ); $ext = strtolower( $i ? substr( $file, $i + 1 ) : '' ); } if ( $ext ) { $m = $this->guessTypesForExtension( $ext ); # TODO: if $notAnImage is set, do not trust the file extension if # the results is one of the image types that should have been recognized # by getimagesize 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 (int?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 = 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; } # 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 $e = NULL; 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 funktion relies on the mapping defined by $this->mMediaTypes * @access private */ 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]; } $m = array($extMime); } foreach ( $m as $mime ) { foreach ( $this->mMediaTypes as $type => $codes ) { if ( in_array($mime, $codes, true ) ) { return $type; } } } return MEDIATYPE_UNKNOWN; } }