class LLMS_Mime_Type_Extractor {

	const DEFAULT_MIME_TYPE = 'application/octet-stream';

	/**
	 * Mime Type List
	 *
	 * @var array
	 */
	private static $mime_type_list = array(
		'zip'     => 'application/zip',
		'gz'      => 'application/gzip',
		'bz2'     => 'application/x-bzip',
		'tar'     => 'application/x-tar',
		'3gp'     => 'video/3gpp',
		'ai'      => 'application/postscript',
		'aif'     => 'audio/x-aiff',
		'aifc'    => 'audio/x-aiff',
		'aiff'    => 'audio/x-aiff',
		'asc'     => 'text/plain',
		'atom'    => 'application/atom+xml',
		'au'      => 'audio/basic',
		'avi'     => 'video/x-msvideo',
		'bcpio'   => 'application/x-bcpio',
		'bin'     => 'application/octet-stream',
		'bmp'     => 'image/bmp',
		'cdf'     => 'application/x-netcdf',
		'cgm'     => 'image/cgm',
		'class'   => 'application/octet-stream',
		'cpio'    => 'application/x-cpio',
		'cpt'     => 'application/mac-compactpro',
		'csh'     => 'application/x-csh',
		'css'     => 'text/css',
		'dcr'     => 'application/x-director',
		'dif'     => 'video/x-dv',
		'dir'     => 'application/x-director',
		'djv'     => 'image/vnd.djvu',
		'djvu'    => 'image/vnd.djvu',
		'dll'     => 'application/octet-stream',
		'dmg'     => 'application/octet-stream',
		'dms'     => 'application/octet-stream',
		'doc'     => 'application/msword',
		'dtd'     => 'application/xml-dtd',
		'dv'      => 'video/x-dv',
		'dvi'     => 'application/x-dvi',
		'dxr'     => 'application/x-director',
		'eps'     => 'application/postscript',
		'etx'     => 'text/x-setext',
		'exe'     => 'application/octet-stream',
		'ez'      => 'application/andrew-inset',
		'flv'     => 'video/x-flv',
		'gif'     => 'image/gif',
		'gram'    => 'application/srgs',
		'grxml'   => 'application/srgs+xml',
		'gtar'    => 'application/x-gtar',
		'hdf'     => 'application/x-hdf',
		'hqx'     => 'application/mac-binhex40',
		'htm'     => 'text/html',
		'html'    => 'text/html',
		'ice'     => 'x-conference/x-cooltalk',
		'ico'     => 'image/x-icon',
		'ics'     => 'text/calendar',
		'ief'     => 'image/ief',
		'ifb'     => 'text/calendar',
		'iges'    => 'model/iges',
		'igs'     => 'model/iges',
		'jnlp'    => 'application/x-java-jnlp-file',
		'jp2'     => 'image/jp2',
		'jpe'     => 'image/jpeg',
		'jpeg'    => 'image/jpeg',
		'jpg'     => 'image/jpeg',
		'js'      => 'application/x-javascript',
		'kar'     => 'audio/midi',
		'latex'   => 'application/x-latex',
		'lha'     => 'application/octet-stream',
		'lzh'     => 'application/octet-stream',
		'm3u'     => 'audio/x-mpegurl',
		'm4a'     => 'audio/mp4a-latm',
		'm4p'     => 'audio/mp4a-latm',
		'm4u'     => 'video/vnd.mpegurl',
		'm4v'     => 'video/x-m4v',
		'mac'     => 'image/x-macpaint',
		'man'     => 'application/x-troff-man',
		'mathml'  => 'application/mathml+xml',
		'me'      => 'application/x-troff-me',
		'mesh'    => 'model/mesh',
		'mid'     => 'audio/midi',
		'midi'    => 'audio/midi',
		'mif'     => 'application/vnd.mif',
		'mov'     => 'video/quicktime',
		'movie'   => 'video/x-sgi-movie',
		'mp2'     => 'audio/mpeg',
		'mp3'     => 'audio/mpeg',
		'mp4'     => 'video/mp4',
		'mpe'     => 'video/mpeg',
		'mpeg'    => 'video/mpeg',
		'mpg'     => 'video/mpeg',
		'mpga'    => 'audio/mpeg',
		'ms'      => 'application/x-troff-ms',
		'msh'     => 'model/mesh',
		'mxu'     => 'video/vnd.mpegurl',
		'nc'      => 'application/x-netcdf',
		'oda'     => 'application/oda',
		'ogg'     => 'application/ogg',
		'ogv'     => 'video/ogv',
		'pbm'     => 'image/x-portable-bitmap',
		'pct'     => 'image/pict',
		'pdb'     => 'chemical/x-pdb',
		'pdf'     => 'application/pdf',
		'pgm'     => 'image/x-portable-graymap',
		'pgn'     => 'application/x-chess-pgn',
		'pic'     => 'image/pict',
		'pict'    => 'image/pict',
		'png'     => 'image/png',
		'pnm'     => 'image/x-portable-anymap',
		'pnt'     => 'image/x-macpaint',
		'pntg'    => 'image/x-macpaint',
		'ppm'     => 'image/x-portable-pixmap',
		'ppt'     => 'application/vnd.ms-powerpoint',
		'ps'      => 'application/postscript',
		'qt'      => 'video/quicktime',
		'qti'     => 'image/x-quicktime',
		'qtif'    => 'image/x-quicktime',
		'ra'      => 'audio/x-pn-realaudio',
		'ram'     => 'audio/x-pn-realaudio',
		'ras'     => 'image/x-cmu-raster',
		'rdf'     => 'application/rdf+xml',
		'rgb'     => 'image/x-rgb',
		'rm'      => 'application/vnd.rn-realmedia',
		'roff'    => 'application/x-troff',
		'rtf'     => 'text/rtf',
		'rtx'     => 'text/richtext',
		'sgm'     => 'text/sgml',
		'sgml'    => 'text/sgml',
		'sh'      => 'application/x-sh',
		'shar'    => 'application/x-shar',
		'silo'    => 'model/mesh',
		'sit'     => 'application/x-stuffit',
		'skd'     => 'application/x-koan',
		'skm'     => 'application/x-koan',
		'skp'     => 'application/x-koan',
		'skt'     => 'application/x-koan',
		'smi'     => 'application/smil',
		'smil'    => 'application/smil',
		'snd'     => 'audio/basic',
		'so'      => 'application/octet-stream',
		'spl'     => 'application/x-futuresplash',
		'src'     => 'application/x-wais-source',
		'sv4cpio' => 'application/x-sv4cpio',
		'sv4crc'  => 'application/x-sv4crc',
		'svg'     => 'image/svg+xml',
		'swf'     => 'application/x-shockwave-flash',
		't'       => 'application/x-troff',
		'tcl'     => 'application/x-tcl',
		'tex'     => 'application/x-tex',
		'texi'    => 'application/x-texinfo',
		'texinfo' => 'application/x-texinfo',
		'tif'     => 'image/tiff',
		'tiff'    => 'image/tiff',
		'tr'      => 'application/x-troff',
		'tsv'     => 'text/tab-separated-values',
		'txt'     => 'text/plain',
		'ustar'   => 'application/x-ustar',
		'vcd'     => 'application/x-cdlink',
		'vrml'    => 'model/vrml',
		'vxml'    => 'application/voicexml+xml',
		'wav'     => 'audio/x-wav',
		'wbmp'    => 'image/vnd.wap.wbmp',
		'wbxml'   => 'application/vnd.wap.wbxml',
		'webm'    => 'video/webm',
		'wml'     => 'text/vnd.wap.wml',
		'wmlc'    => 'application/vnd.wap.wmlc',
		'wmls'    => 'text/vnd.wap.wmlscript',
		'wmlsc'   => 'application/vnd.wap.wmlscriptc',
		'wmv'     => 'video/x-ms-wmv',
		'wrl'     => 'model/vrml',
		'xbm'     => 'image/x-xbitmap',
		'xht'     => 'application/xhtml+xml',
		'xhtml'   => 'application/xhtml+xml',
		'xls'     => 'application/vnd.ms-excel',
		'xml'     => 'application/xml',
		'xpm'     => 'image/x-xpixmap',
		'xsl'     => 'application/xml',
		'xslt'    => 'application/xslt+xml',
		'xul'     => 'application/vnd.mozilla.xul+xml',
		'xwd'     => 'image/x-xwindowdump',
		'xyz'     => 'chemical/x-xyz',
	);

	/**
	 * Retrieve the mime type from file path.
	 *
	 * @param string $file The file path string.
	 * @return string
	 */
	public static function from_file_path( $file ) {

		if ( ! is_readable( $file ) || is_dir( $file ) || is_link( $file ) ) {
			return self::DEFAULT_MIME_TYPE;
		}

		$mime_type   = '';
		$file_suffix = pathinfo( $file, PATHINFO_EXTENSION );
		$suffix      = strtolower( $file_suffix );

		if ( isset( self::$mime_type_list[ $suffix ] ) ) {
			$mime_type = self::$mime_type_list[ $suffix ];
		}

		if ( ! $mime_type && function_exists( 'finfo_file' ) ) {
			$finfo     = finfo_open( FILEINFO_MIME_TYPE );
			$mime_type = finfo_file( $finfo, $file );
			finfo_close( $finfo );
		}

		if ( ! $mime_type && function_exists( 'mime_content_type' ) ) {
			$mime_type = mime_content_type( $file );
		}

		return $mime_type ? $mime_type : self::DEFAULT_MIME_TYPE;
	}

}