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<?php |
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/** |
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* Asset minifier — HTML, CSS, JS. |
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* |
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* Uses matthiasmullie/minify for CSS/JS. Local enqueued assets are minified |
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* once, cached on disk, and the loader URL is rewritten to point at the |
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* cached file. |
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* |
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* @package XSpeed |
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*/ |
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|
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namespace XSpeed; |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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class Minifier { |
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|
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const MIN_SUBDIR = 'min'; |
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|
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/** |
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* Absolute path to the minified-cache directory. Always derived from |
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* XSPEED_CACHE_DIR (the plugin's own cache root) — never assembled from |
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* arbitrary URL fragments. |
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*/ |
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private static function min_dir() { |
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return trailingslashit( XSPEED_CACHE_DIR ) . self::MIN_SUBDIR; |
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} |
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|
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/** |
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* Public URL of the minified-cache directory. Built from content_url() + |
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* the known relative path, not by string-replacing WP_CONTENT_DIR out of |
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* a filesystem path (which would assume the filesystem layout matches |
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* the URL layout — it does not on Bedrock-style installs, multisite with |
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* mapped domains, or any setup with a relocated wp-content). |
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*/ |
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private static function min_url() { |
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// XSPEED_CACHE_DIR lives under wp-content (defined in xspeed.php as |
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// WP_CONTENT_DIR . '/cache/xspeed'), so the URL is content_url() + |
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// the known suffix. We do not derive URLs from arbitrary filesystem |
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// paths anywhere in this plugin. |
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return trailingslashit( content_url( 'cache/xspeed' ) ) . self::MIN_SUBDIR; |
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} |
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|
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public function __construct() { |
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// Only run on the frontend — never minify wp-admin, AJAX, REST or cron |
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// asset URLs. Page caching already handles the logged-in case for |
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// the HTML response; minify scope is the public frontend. |
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if ( is_admin() || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) || ( defined( 'DOING_CRON' ) && DOING_CRON ) || ( defined( 'REST_REQUEST' ) && REST_REQUEST ) ) { |
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return; |
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} |
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|
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$opts = Settings::get(); |
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|
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if ( ! empty( $opts['minify_css'] ) ) { |
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add_filter( 'style_loader_src', array( __CLASS__, 'rewrite_style' ), 10, 2 ); |
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} |
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if ( ! empty( $opts['minify_js'] ) ) { |
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add_filter( 'script_loader_src', array( __CLASS__, 'rewrite_script' ), 10, 2 ); |
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} |
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} |
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|
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public static function minify_html( $html ) { |
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$debug_skip = defined( 'WP_DEBUG' ) && WP_DEBUG; |
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if ( apply_filters( 'xspeed_skip_minify', $debug_skip ) ) { |
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return $html; |
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} |
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|
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$placeholders = array(); |
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$pattern = '#<(pre|textarea|script|style)\b[^>]*>.*?</\1>#is'; |
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$html = preg_replace_callback( |
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$pattern, |
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function ( $m ) use ( &$placeholders ) { |
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$key = '__XSPEED_PH_' . count( $placeholders ) . '__'; |
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$placeholders[ $key ] = $m[0]; |
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return $key; |
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}, |
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$html |
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); |
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|
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$html = preg_replace( '/<!--(?!\[if).*?-->/s', '', $html ); |
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$html = preg_replace( '/\s+/', ' ', $html ); |
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$html = preg_replace( '/>\s+</', '><', $html ); |
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$html = trim( $html ); |
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|
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foreach ( $placeholders as $key => $original ) { |
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$html = str_replace( $key, $original, $html ); |
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} |
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|
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return $html; |
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} |
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|
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public static function rewrite_style( $src, $handle ) { |
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unset( $handle ); |
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return self::rewrite_asset( $src, 'css' ); |
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} |
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|
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public static function rewrite_script( $src, $handle ) { |
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unset( $handle ); |
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return self::rewrite_asset( $src, 'js' ); |
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} |
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|
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/** |
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* Replace a local CSS/JS URL with a cached, minified equivalent. |
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* |
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* @param string $src Original asset URL. |
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* @param string $type 'css' or 'js'. |
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* @return string Possibly rewritten URL. |
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*/ |
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private static function rewrite_asset( $src, $type ) { |
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if ( ! is_string( $src ) || '' === $src ) { |
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return $src; |
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} |
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|
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// Skip already-minified files. |
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if ( false !== strpos( $src, '.min.' ) ) { |
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return $src; |
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} |
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|
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// Resolve to a local path; bail if external or unresolvable. |
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$path = self::url_to_path( $src ); |
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if ( ! $path || ! is_readable( $path ) ) { |
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return $src; |
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} |
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|
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// Build a cache filename keyed on path + mtime so edits invalidate. |
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$mtime = filemtime( $path ); |
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$key = md5( $path . '|' . $mtime ); |
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$cache = self::cache_path( $key, $type ); |
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|
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if ( ! file_exists( $cache ) ) { |
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$ok = self::minify_file( $path, $cache, $type ); |
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if ( ! $ok ) { |
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return $src; |
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} |
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} |
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|
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// Return a URL to the cached file. Built from known constants — never |
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// from str_replace on a filesystem path (which would assume the FS |
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// layout mirrors the URL layout). |
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return self::min_url() . '/' . $key . '.' . $type; |
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} |
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|
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private static function minify_file( $source_path, $target_path, $type ) { |
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if ( ! class_exists( '\\MatthiasMullie\\Minify\\CSS' ) ) { |
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return false; |
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} |
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|
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// Path-traversal guard: refuse to write anywhere outside our cache |
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// dir, even if a malicious filter ever produced a poisoned key. |
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$cache_root = self::min_dir(); |
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self::ensure_dir( $cache_root ); |
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$real_root = realpath( $cache_root ); |
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$real_dir = realpath( dirname( $target_path ) ); |
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if ( ! $real_root || ! $real_dir || 0 !== strpos( $real_dir, $real_root ) ) { |
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return false; |
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} |
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|
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try { |
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$minifier = ( 'css' === $type ) |
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? new \MatthiasMullie\Minify\CSS( $source_path ) |
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: new \MatthiasMullie\Minify\JS( $source_path ); |
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|
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$minified = $minifier->minify(); |
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|
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// Sanity check: paren/brace/bracket/backtick balance must be preserved. |
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// matthiasmullie/minify can silently truncate mid-template-literal on |
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// complex modern JS — bail rather than ship a broken file. |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- WP_Filesystem requires admin context; minification runs on frontend page renders. Source already validated as readable on line 121. |
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$source = file_get_contents( $source_path ); |
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if ( false === $source || ! self::balanced( $source, $minified ) ) { |
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return false; |
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} |
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|
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_put_contents_file_put_contents -- WP_Filesystem requires admin context; minification runs on frontend page renders. |
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$bytes = file_put_contents( $target_path, $minified ); |
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return false !== $bytes && file_exists( $target_path ); |
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} catch ( \Throwable $e ) { |
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return false; |
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} |
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} |
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|
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/** |
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* Resolve a local asset URL to a filesystem path using a strict allowlist |
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* of "URL prefix → filesystem prefix" pairs registered with WordPress. |
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* |
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* We never assume `site_url()` maps to `ABSPATH` (the WordPress root can |
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* live above the document root in Bedrock-style installs, behind a proxy, |
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* or on multisite with mapped domains). Each branch resolves through a |
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* known WP API (plugins, themes, content, includes) and validates that |
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* `realpath()` of the result still lives under the expected base — so a |
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* crafted `..`-laden URL cannot escape into the filesystem. |
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* |
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* @param string $url Asset URL (may be protocol-relative or absolute). |
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* @return string|false Absolute filesystem path on success, false otherwise. |
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*/ |
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private static function url_to_path( $url ) { |
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if ( ! is_string( $url ) || '' === $url ) { |
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return false; |
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} |
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|
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// Drop query string + fragment. |
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$clean = strtok( $url, '?#' ); |
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|
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// Normalise protocol-relative + scheme variants of the host so we |
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// match regardless of whether the asset URL came in over http/https. |
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$site_host = wp_parse_url( home_url(), PHP_URL_HOST ); |
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if ( 0 === strpos( $clean, '//' ) ) { |
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$clean = 'https:' . $clean; |
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} |
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if ( $site_host ) { |
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$asset_host = wp_parse_url( $clean, PHP_URL_HOST ); |
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if ( $asset_host && $asset_host !== $site_host ) { |
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return false; // External asset — never touch. |
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} |
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} |
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|
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$candidates = array( |
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array( plugins_url(), WP_PLUGIN_DIR ), |
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array( get_stylesheet_directory_uri(), get_stylesheet_directory() ), |
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array( get_template_directory_uri(), get_template_directory() ), |
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array( content_url(), WP_CONTENT_DIR ), |
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array( includes_url(), ABSPATH . WPINC ), |
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); |
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|
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foreach ( $candidates as $pair ) { |
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list( $url_base, $path_base ) = $pair; |
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if ( ! $url_base || ! $path_base ) { |
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continue; |
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} |
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$url_base = rtrim( $url_base, '/' ); |
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if ( 0 !== strpos( $clean, $url_base . '/' ) && $clean !== $url_base ) { |
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continue; |
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} |
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|
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$relative = ltrim( substr( $clean, strlen( $url_base ) ), '/' ); |
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$candidate = trailingslashit( $path_base ) . $relative; |
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|
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$real_base = realpath( $path_base ); |
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$real = realpath( $candidate ); |
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if ( ! $real_base || ! $real ) { |
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return false; |
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} |
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// Guard against `..`-traversal: resolved path must stay inside |
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// the registered base. |
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if ( 0 !== strpos( $real, $real_base ) ) { |
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return false; |
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} |
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return $real; |
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} |
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|
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return false; |
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} |
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|
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private static function cache_path( $key, $type ) { |
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return self::min_dir() . '/' . $key . '.' . $type; |
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} |
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|
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private static function ensure_dir( $dir ) { |
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if ( ! file_exists( $dir ) ) { |
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wp_mkdir_p( $dir ); |
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Cache::write_silence( $dir ); |
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} |
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} |
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|
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public static function purge_minified() { |
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$dir = self::min_dir(); |
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if ( ! is_dir( $dir ) ) { |
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return; |
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} |
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foreach ( glob( $dir . '/*' ) as $file ) { |
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wp_delete_file( $file ); |
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} |
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} |
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} |
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|
