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<?php /** * Rewrite file-relative URIs as root-relative in CSS files * * @package Minify * @author Stephen Clay <[email protected]> */ namespace LiteSpeed\Lib; defined( 'WPINC' ) || exit; class UriRewriter { /** * rewrite() and rewriteRelative() append debugging information here * * @var string */ public static $debugText = ''; /** * In CSS content, rewrite file relative URIs as root relative * * @param string $css * * @param string $currentDir The directory of the current CSS file. * * @param string $docRoot The document root of the web site in which * the CSS file resides (default = $_SERVER['DOCUMENT_ROOT']). * * @param array $symlinks (default = array()) If the CSS file is stored in * a symlink-ed directory, provide an array of link paths to * target paths, where the link paths are within the document root. Because * paths need to be normalized for this to work, use "//" to substitute * the doc root in the link paths (the array keys). E.g.: * <code> * array('//symlink' => '/real/target/path') // unix * array('//static' => 'D:\\staticStorage') // Windows * </code> * * @return string */ public static function rewrite( $css, $currentDir, $docRoot = null, $symlinks = array() ) { self::$_docRoot = self::_realpath( $docRoot ? $docRoot : $_SERVER['DOCUMENT_ROOT'] ); self::$_currentDir = self::_realpath( $currentDir ); self::$_symlinks = array(); // normalize symlinks in order to map to link foreach ( $symlinks as $link => $target ) { $link = ( $link === '//' ) ? self::$_docRoot : str_replace( '//', self::$_docRoot . '/', $link ); $link = strtr( $link, '/', DIRECTORY_SEPARATOR ); self::$_symlinks[ $link ] = self::_realpath( $target ); } self::$debugText .= 'docRoot : ' . self::$_docRoot . "\n" . 'currentDir : ' . self::$_currentDir . "\n"; if ( self::$_symlinks ) { self::$debugText .= 'symlinks : ' . var_export( self::$_symlinks, 1 ) . "\n"; } self::$debugText .= "\n"; $css = self::_trimUrls( $css ); $css = self::_owlifySvgPaths( $css ); // rewrite $pattern = '/@import\\s+([\'"])(.*?)[\'"]/'; $css = preg_replace_callback( $pattern, __CLASS__ . '::_processUriCB', $css ); $pattern = '/url\\(\\s*([\'"](.*?)[\'"]|[^\\)\\s]+)\\s*\\)/'; $css = preg_replace_callback( $pattern, __CLASS__ . '::_processUriCB', $css ); $css = self::_unOwlify( $css ); return $css; } /** * In CSS content, prepend a path to relative URIs * * @param string $css * * @param string $path The path to prepend. * * @return string */ public static function prepend( $css, $path ) { self::$_prependPath = $path; $css = self::_trimUrls( $css ); $css = self::_owlifySvgPaths( $css ); // append $pattern = '/@import\\s+([\'"])(.*?)[\'"]/'; $css = preg_replace_callback( $pattern, __CLASS__ . '::_processUriCB', $css ); $pattern = '/url\\(\\s*([\'"](.*?)[\'"]|[^\\)\\s]+)\\s*\\)/'; $css = preg_replace_callback( $pattern, __CLASS__ . '::_processUriCB', $css ); $css = self::_unOwlify( $css ); self::$_prependPath = null; return $css; } /** * Get a root relative URI from a file relative URI * * <code> * UriRewriter::rewriteRelative( * '../img/hello.gif' * , '/home/user/www/css' // path of CSS file * , '/home/user/www' // doc root * ); * // returns '/img/hello.gif' * * // example where static files are stored in a symlinked directory * UriRewriter::rewriteRelative( * 'hello.gif' * , '/var/staticFiles/theme' * , '/home/user/www' * , array('/home/user/www/static' => '/var/staticFiles') * ); * // returns '/static/theme/hello.gif' * </code> * * @param string $uri file relative URI * * @param string $realCurrentDir realpath of the current file's directory. * * @param string $realDocRoot realpath of the site document root. * * @param array $symlinks (default = array()) If the file is stored in * a symlink-ed directory, provide an array of link paths to * real target paths, where the link paths "appear" to be within the document * root. E.g.: * <code> * array('/home/foo/www/not/real/path' => '/real/target/path') // unix * array('C:\\htdocs\\not\\real' => 'D:\\real\\target\\path') // Windows * </code> * * @return string */ public static function rewriteRelative( $uri, $realCurrentDir, $realDocRoot, $symlinks = array() ) { // prepend path with current dir separator (OS-independent) $path = strtr( $realCurrentDir, '/', DIRECTORY_SEPARATOR ); $path .= DIRECTORY_SEPARATOR . strtr( $uri, '/', DIRECTORY_SEPARATOR ); self::$debugText .= "file-relative URI : {$uri}\n" . "path prepended : {$path}\n"; // "unresolve" a symlink back to doc root foreach ( $symlinks as $link => $target ) { if ( 0 === strpos( $path, $target ) ) { // replace $target with $link $path = $link . substr( $path, strlen( $target ) ); self::$debugText .= "symlink unresolved : {$path}\n"; break; } } // strip doc root $path = substr( $path, strlen( $realDocRoot ) ); self::$debugText .= "docroot stripped : {$path}\n"; // fix to root-relative URI $uri = strtr( $path, '/\\', '//' ); $uri = self::removeDots( $uri ); self::$debugText .= "traversals removed : {$uri}\n\n"; return $uri; } /** * Remove instances of "./" and "../" where possible from a root-relative URI * * @param string $uri * * @return string */ public static function removeDots( $uri ) { $uri = str_replace( '/./', '/', $uri ); // inspired by patch from Oleg Cherniy do { $uri = preg_replace( '@/[^/]+/\\.\\./@', '/', $uri, 1, $changed ); } while ( $changed ); return $uri; } /** * Get realpath with any trailing slash removed. If realpath() fails, * just remove the trailing slash. * * @param string $path * * @return mixed path with no trailing slash */ protected static function _realpath( $path ) { $realPath = realpath( $path ); if ( $realPath !== false ) { $path = $realPath; } return rtrim( $path, '/\\' ); } /** * Directory of this stylesheet * * @var string */ private static $_currentDir = ''; /** * DOC_ROOT * * @var string */ private static $_docRoot = ''; /** * directory replacements to map symlink targets back to their * source (within the document root) E.g. '/var/www/symlink' => '/var/realpath' * * @var array */ private static $_symlinks = array(); /** * Path to prepend * * @var string */ private static $_prependPath = null; /** * @param string $css * * @return string */ private static function _trimUrls( $css ) { $pattern = '/ url\\( # url( \\s* ([^\\)]+?) # 1 = URI (assuming does not contain ")") \\s* \\) # ) /x'; return preg_replace( $pattern, 'url($1)', $css ); } /** * @param array $m * * @return string */ private static function _processUriCB( $m ) { // $m matched either '/@import\\s+([\'"])(.*?)[\'"]/' or '/url\\(\\s*([^\\)\\s]+)\\s*\\)/' $isImport = ( $m[0][0] === '@' ); // determine URI and the quote character (if any) if ( $isImport ) { $quoteChar = $m[1]; $uri = $m[2]; } else { // $m[1] is either quoted or not $quoteChar = ( $m[1][0] === "'" || $m[1][0] === '"' ) ? $m[1][0] : ''; $uri = ( $quoteChar === '' ) ? $m[1] : substr( $m[1], 1, strlen( $m[1] ) - 2 ); } if ( $uri === '' ) { return $m[0]; } // if not anchor id, not root/scheme relative, and not starts with scheme if ( ! preg_match( '~^(#|/|[a-z]+\:)~', $uri ) ) { // URI is file-relative: rewrite depending on options if ( self::$_prependPath === null ) { $uri = self::rewriteRelative( $uri, self::$_currentDir, self::$_docRoot, self::$_symlinks ); } else { $uri = self::$_prependPath . $uri; if ( $uri[0] === '/' ) { $root = ''; $rootRelative = $uri; $uri = $root . self::removeDots( $rootRelative ); } elseif ( preg_match( '@^((https?\:)?//([^/]+))/@', $uri, $m ) && ( false !== strpos( $m[3], '.' ) ) ) { $root = $m[1]; $rootRelative = substr( $uri, strlen( $root ) ); $uri = $root . self::removeDots( $rootRelative ); } } } if ( $isImport ) { return "@import {$quoteChar}{$uri}{$quoteChar}"; } else { return "url({$quoteChar}{$uri}{$quoteChar})"; } } /** * Mungs some inline SVG URL declarations so they won't be touched * * @link https://github.com/mrclay/minify/issues/517 * @see _unOwlify * * @param string $css * @return string */ private static function _owlifySvgPaths( $css ) { $pattern = '~\b((?:clip-path|mask|-webkit-mask)\s*\:\s*)url(\(\s*#\w+\s*\))~'; return preg_replace( $pattern, '$1owl$2', $css ); } /** * Undo work of _owlify * * @see _owlifySvgPaths * * @param string $css * @return string */ private static function _unOwlify( $css ) { $pattern = '~\b((?:clip-path|mask|-webkit-mask)\s*\:\s*)owl~'; return preg_replace( $pattern, '$1url', $css ); } }