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<?php
namespace W3TCL\Minify;
/**
* Class Minify
* @package Minify
*/
/**
* Minify - Combines, minifies, and caches JavaScript and CSS files on demand.
*
* See README for usage instructions (for now).
*
* This library was inspired by {@link mailto:flashkot@mail.ru jscsscomp by Maxim Martynyuk}
* and by the article {@link http://www.hunlock.com/blogs/Supercharged_Javascript "Supercharged JavaScript" by Patrick Hunlock}.
*
* Requires PHP 5.1.0.
* Tested on PHP 5.1.6.
*
* @package Minify
* @author Ryan Grove <ryan@wonko.com>
* @author Stephen Clay <steve@mrclay.org>
* @copyright 2008 Ryan Grove, Stephen Clay. All rights reserved.
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @link http://code.google.com/p/minify/
*/
class Minify {
const VERSION = '2.1.7';
const TYPE_CSS = 'text/css';
const TYPE_HTML = 'text/html';
// there is some debate over the ideal JS Content-Type, but this is the
// Apache default and what Yahoo! uses..
const TYPE_JS = 'application/x-javascript';
const URL_DEBUG = 'http://code.google.com/p/minify/wiki/Debugging';
/**
* How many hours behind are the file modification times of uploaded files?
*
* If you upload files from Windows to a non-Windows server, Windows may report
* incorrect mtimes for the files. Immediately after modifying and uploading a
* file, use the touch command to update the mtime on the server. If the mtime
* jumps ahead by a number of hours, set this variable to that number. If the mtime
* moves back, this should not be needed.
*
* @var int $uploaderHoursBehind
*/
public static $uploaderHoursBehind = 0;
/**
* If this string is not empty AND the serve() option 'bubbleCssImports' is
* NOT set, then serve() will check CSS files for @import declarations that
* appear too late in the combined stylesheet. If found, serve() will prepend
* the output with this warning.
*
* @var string $importWarning
*/
public static $importWarning = "/* See http://code.google.com/p/minify/wiki/CommonProblems#@imports_can_appear_in_invalid_locations_in_combined_CSS_files */\n";
/**
* Has the DOCUMENT_ROOT been set in user code?
*
* @var bool
*/
public static $isDocRootSet = false;
/**
* Cache ID
* @var string
*/
protected static $_cacheId = null;
/**
* Specify a cache object (with identical interface as Minify_Cache_File) or
* a path to use with Minify_Cache_File.
*
* If not called, Minify will not use a cache and, for each 200 response, will
* need to recombine files, minify and encode the output.
*
* @param mixed $cache object with identical interface as Minify_Cache_File or
* a directory path, or null to disable caching. (default = '')
*
* @param bool $fileLocking (default = true) This only applies if the first
* parameter is a string.
*
* @return null
*/
public static function setCache($cache = '', $fileLocking = true)
{
if (is_string($cache)) {
self::$_cache = new Minify_Cache_File($cache, $fileLocking);
} else {
self::$_cache = $cache;
}
}
/**
* Serve a request for a minified file.
*
* Here are the available options and defaults in the base controller:
*
* 'isPublic' : send "public" instead of "private" in Cache-Control
* headers, allowing shared caches to cache the output. (default true)
*
* 'quiet' : set to true to have serve() return an array rather than sending
* any headers/output (default false)
*
* 'encodeOutput' : set to false to disable content encoding, and not send
* the Vary header (default true)
*
* 'encodeMethod' : generally you should let this be determined by
* HTTP_Encoder (leave null), but you can force a particular encoding
* to be returned, by setting this to 'gzip' or '' (no encoding)
*
* 'encodeLevel' : level of encoding compression (0 to 9, default 9)
*
* 'contentTypeCharset' : appended to the Content-Type header sent. Set to a falsey
* value to remove. (default 'utf-8')
*
* 'maxAge' : set this to the number of seconds the client should use its cache
* before revalidating with the server. This sets Cache-Control: max-age and the
* Expires header. Unlike the old 'setExpires' setting, this setting will NOT
* prevent conditional GETs. Note this has nothing to do with server-side caching.
*
* 'rewriteCssUris' : If true, serve() will automatically set the 'currentDir'
* minifier option to enable URI rewriting in CSS files (default true)
*
* 'bubbleCssImports' : If true, all @import declarations in combined CSS
* files will be move to the top. Note this may alter effective CSS values
* due to a change in order. (default false)
*
* 'debug' : set to true to minify all sources with the 'Lines' controller, which
* eases the debugging of combined files. This also prevents 304 responses.
* @see Minify_Lines::minify()
*
* 'minifiers' : to override Minify's default choice of minifier function for
* a particular content-type, specify your callback under the key of the
* content-type:
* <code>
* // call customCssMinifier($css) for all CSS minification
* $options['minifiers'][Minify::TYPE_CSS] = 'customCssMinifier';
*
* // don't minify Javascript at all
* $options['minifiers'][Minify::TYPE_JS] = '';
* </code>
*
* 'minifierOptions' : to send options to the minifier function, specify your options
* under the key of the content-type. E.g. To send the CSS minifier an option:
* <code>
* // give CSS minifier array('optionName' => 'optionValue') as 2nd argument
* $options['minifierOptions'][Minify::TYPE_CSS]['optionName'] = 'optionValue';
* </code>
*
* 'contentType' : (optional) this is only needed if your file extension is not
* js/css/html. The given content-type will be sent regardless of source file
* extension, so this should not be used in a Groups config with other
* Javascript/CSS files.
*
* Any controller options are documented in that controller's setupSources() method.
*
* @param mixed $controller instance of subclass of Minify_Controller_Base or string
* name of controller. E.g. 'Files'
*
* @param array $options controller/serve options
*
* @return null|array if the 'quiet' option is set to true, an array
* with keys "success" (bool), "statusCode" (int), "content" (string), and
* "headers" (array).
*
* @throws Exception
*/
public static function serve($controller, $options = array())
{
if (! self::$isDocRootSet && 0 === stripos(PHP_OS, 'win')) {
self::setDocRoot();
}
if (is_string($controller)) {
// make $controller into object
$class = '\W3TCL\Minify\Minify_Controller_' . $controller;
$controller = new $class();
/* @var Minify_Controller_Base $controller */
}
// set up controller sources and mix remaining options with
// controller defaults
$options = $controller->setupSources($options);
$options = $controller->analyzeSources($options);
self::$_options = $controller->mixInDefaultOptions($options);
// check request validity
if (! $controller->sources) {
// invalid request!
if (! self::$_options['quiet']) {
self::_errorExit(self::$_options['badRequestHeader'], self::URL_DEBUG);
} else {
list(,$statusCode) = explode(' ', self::$_options['badRequestHeader']);
return array(
'success' => false
,'statusCode' => (int)$statusCode
,'content' => ''
,'headers' => array()
);
}
}
self::$_controller = $controller;
if (self::$_options['debug']) {
self::_setupDebug($controller->sources);
self::$_options['maxAge'] = 0;
}
// determine encoding
if (self::$_options['encodeOutput']) {
$sendVary = true;
if (self::$_options['encodeMethod'] !== null) {
// controller specifically requested this
$contentEncoding = self::$_options['encodeMethod'];
} else {
// sniff request header
// depending on what the client accepts, $contentEncoding may be
// 'x-gzip' while our internal encodeMethod is 'gzip'. Calling
// getAcceptedEncoding(false, false) leaves out compress and deflate as options.
list(self::$_options['encodeMethod'], $contentEncoding) = HTTP_Encoder::getAcceptedEncoding(false, false);
$sendVary = ! HTTP_Encoder::isBuggyIe();
}
} else {
self::$_options['encodeMethod'] = ''; // identity (no encoding)
}
// check client cache
$cgOptions = array(
'lastModifiedTime' => self::$_options['lastModifiedTime']
,'cacheHeaders' => self::$_options['cacheHeaders']
,'isPublic' => self::$_options['isPublic']
,'encoding' => self::$_options['encodeMethod']
);
if (self::$_options['maxAge'] > 0) {
$cgOptions['maxAge'] = self::$_options['maxAge'];
} elseif (self::$_options['debug']) {
$cgOptions['invalidate'] = true;
}
$cg = new HTTP_ConditionalGet($cgOptions);
if ( $cg->cacheIsValid && !self::$_options['disable_304'] &&
!defined( 'W3TC_MINIFY_CONDITIONAL_OFF' ) ) {
// client's cache is valid
if (! self::$_options['quiet']) {
self::$lastServed = array(
'fullCacheId' =>self::_getCacheId() .
(self::$_options['encodeMethod']
? '.' . self::$_options['encodeMethod']
: '')
);
$cg->sendHeaders();
return;
} else {
return array(
'success' => true
,'statusCode' => 304
,'content' => ''
,'headers' => $cg->getHeaders()
);
}
} else {
// client will need output
$headers = $cg->getHeaders();
unset($cg);
}
if (self::$_options['contentType'] === self::TYPE_CSS
&& self::$_options['rewriteCssUris']) {
foreach($controller->sources as $key => $source) {
if (self::$_options['rewriteCssUris']
&& $source->filepath
&& !isset($source->minifyOptions['currentDir'])
&& !isset($source->minifyOptions['prependRelativePath'])
) {
$source->minifyOptions['currentDir'] = dirname($source->filepath);
}
$source->minifyOptions['processCssImports'] = self::$_options['processCssImports'];
}
}
// check server cache
$content = array();
if (null !== self::$_cache && ! self::$_options['debug']) {
// using cache
// the goal is to use only the cache methods to sniff the length and
// output the content, as they do not require ever loading the file into
// memory.
$cacheId = self::_getCacheId();
$fullCacheId = (self::$_options['encodeMethod'])
? $cacheId . '.' . self::$_options['encodeMethod']
: $cacheId;
// check cache for valid entry
$cacheIsReady = self::$_cache->isValid($fullCacheId, self::$_options['lastModifiedTime']);
if ($cacheIsReady) {
$cacheContentLength = self::$_cache->getSize($fullCacheId);
} else {
// generate & cache content
try {
$content = self::_combineMinify();
} catch (\Exception $e) {
self::$_controller->log($e->getMessage());
if (! self::$_options['quiet']) {
self::_errorExit(self::$_options['errorHeader'], self::URL_DEBUG);
}
throw $e;
}
self::$_cache->store($cacheId, $content);
if (function_exists('brotli_compress') && self::$_options['encodeMethod'] === 'br' && self::$_options['encodeOutput']) {
$compressed = $content;
$compressed['content'] = brotli_compress($content['content']);
self::$_cache->store($cacheId . '_' . self::$_options['encodeMethod'],
$compressed);
}
if (function_exists('gzencode') && self::$_options['encodeMethod'] && self::$_options['encodeMethod'] !== 'br' && self::$_options['encodeOutput']) {
$compressed = $content;
$compressed['content'] = gzencode($content['content'],
self::$_options['encodeLevel']);
self::$_cache->store($cacheId . '_' . self::$_options['encodeMethod'],
$compressed);
}
}
} else {
// no cache
$cacheIsReady = false;
try {
$content = self::_combineMinify();
} catch (\Exception $e) {
self::$_controller->log($e->getMessage());
if (! self::$_options['quiet']) {
self::_errorExit(self::$_options['errorHeader'], self::URL_DEBUG);
}
throw $e;
}
}
if (! $cacheIsReady && self::$_options['encodeMethod']) {
switch (self::$_options['encodeMethod']) {
case 'gzip':
$content['content'] = gzencode($content['content'], self::$_options['encodeLevel']);
break;
case 'deflate':
$content['content'] = gzdeflate($content['content'], self::$_options['encodeLevel']);
break;
case 'br':
$content['content'] = brotli_compress($content['content']);
break;
}
// still need to encode
}
// add headers
if ( !defined( 'W3TC_MINIFY_CONTENT_LENGTH_OFF' ) ) {
$headers['Content-Length'] = $cacheIsReady
? $cacheContentLength
: ((function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
? mb_strlen($content['content'], '8bit')
: strlen($content['content'])
);
}
$headers['Content-Type'] = self::$_options['contentTypeCharset']
? self::$_options['contentType'] . '; charset=' . self::$_options['contentTypeCharset']
: self::$_options['contentType'];
if (self::$_options['encodeMethod'] !== '') {
$headers['Content-Encoding'] = $contentEncoding;
}
if (self::$_options['encodeOutput'] && $sendVary) {
$headers['Vary'] = 'Accept-Encoding';
}
self::$lastServed = $content;
if (! self::$_options['quiet']) {
// output headers & content
foreach ($headers as $name => $val) {
header($name . ': ' . $val);
}
if ($cacheIsReady) {
self::$lastServed['fullCacheId'] = $fullCacheId;
self::$_cache->display($fullCacheId);
} else {
echo $content['content'];
}
} else {
if ($cacheIsReady)
$content = self::$_cache->fetch($fullCacheId);
return array(
'success' => true
,'statusCode' => 200
,'content' => $content['content']
,'headers' => $headers
);
}
}
private static $lastServed = array();
public static function getUsageStatistics() {
if (isset(self::$lastServed['fullCacheId']))
self::$lastServed = self::$_cache->fetch(self::$lastServed['fullCacheId']);
if (isset(self::$lastServed['content']) &&
isset(self::$lastServed['originalLength'])) {
return array(
'content_type' => self::$_options['contentType'],
'content_original_length' => self::$lastServed['originalLength'],
'content_output_length' => strlen(self::$lastServed['content'])
);
}
return array();
}
/**
* Return combined minified content for a set of sources
*
* No internal caching will be used and the content will not be HTTP encoded.
*
* @param array $sources array of filepaths and/or Minify_Source objects
*
* @param array $options (optional) array of options for serve. By default
* these are already set: quiet = true, encodeMethod = '', lastModifiedTime = 0.
*
* @return string
*/
public static function combine($sources, $options = array())
{
$cache = self::$_cache;
self::$_cache = null;
$options = array_merge(array(
'files' => (array)$sources
,'quiet' => true
,'encodeMethod' => ''
,'lastModifiedTime' => 0
), $options);
$out = self::serve('Files', $options);
self::$_cache = $cache;
return $out['content'];
}
/**
* Set $_SERVER['DOCUMENT_ROOT']. On IIS, the value is created from SCRIPT_FILENAME and SCRIPT_NAME.
*
* @param string $docRoot value to use for DOCUMENT_ROOT
*/
public static function setDocRoot( $docRoot = '' ) {
self::$isDocRootSet = true;
$server_software = isset( $_SERVER['SERVER_SOFTWARE'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) ) : '';
if ( $docRoot ) {
$_SERVER['DOCUMENT_ROOT'] = $docRoot;
} elseif ( 0 === strpos( $server_software, 'Microsoft-IIS/' ) ) {
$_SERVER['DOCUMENT_ROOT'] = substr(
isset( $_SERVER['SCRIPT_FILENAME'] ) ? esc_url_raw( wp_unslash( $_SERVER['SCRIPT_FILENAME'] ) ) : '',
0,
strlen( isset( $_SERVER['SCRIPT_FILENAME'] ) ? esc_url_raw( wp_unslash( $_SERVER['SCRIPT_FILENAME'] ) ) : '' ) - strlen( isset( $_SERVER['SCRIPT_NAME'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SCRIPT_NAME'] ) ) : '' )
);
$_SERVER['DOCUMENT_ROOT'] = rtrim( isset( $_SERVER['DOCUMENT_ROOT'] ) ? esc_url_raw( wp_unslash( $_SERVER['DOCUMENT_ROOT'] ) ) : '', '\\' );
}
}
public static $recoverableError = null;
/**
* Any Minify_Cache_* object or null (i.e. no server cache is used)
*
* @var Minify_Cache_File
*/
private static $_cache = null;
/**
* Active controller for current request
*
* @var Minify_Controller_Base
*/
protected static $_controller = null;
/**
* Options for current request
*
* @var array
*/
protected static $_options = null;
/**
* @param string $header
*
* @param string $url
*/
protected static function _errorExit($header, $url)
{
$url = htmlspecialchars($url, ENT_QUOTES);
list(,$h1) = explode(' ', $header, 2);
$h1 = htmlspecialchars($h1);
// FastCGI environments require 3rd arg to header() to be set
list(, $code) = explode(' ', $header, 3);
header($header, true, $code);
header('Content-Type: text/html; charset=utf-8');
echo '<h1>' . esc_html( $h1 ) . '</h1>';
echo '<p>Please see <a href="' . esc_url( $url ) . '">' . esc_html( $url ) . '</a>.</p>';
exit();
}
/**
* Set up sources to use Minify_Lines
*
* @param Minify_Source[] $sources Minify_Source instances
*/
protected static function _setupDebug($sources)
{
foreach ($sources as $source) {
$source->minifier = array('\W3TCL\Minify\Minify_Lines', 'minify');
$id = $source->getId();
$source->minifyOptions = array(
'id' => (is_file($id) ? basename($id) : $id)
);
}
}
/**
* Combines sources and minifies the result.
*
* @return string
*
* @throws Exception
*/
protected static function _combineMinify()
{
$type = self::$_options['contentType']; // ease readability
// when combining scripts, make sure all statements separated and
// trailing single line comment is terminated
$implodeSeparator = ($type === self::TYPE_JS)
? "\n;"
: '';
// allow the user to pass a particular array of options to each
// minifier (designated by type). source objects may still override
// these
$defaultOptions = isset(self::$_options['minifierOptions'][$type])
? self::$_options['minifierOptions'][$type]
: array();
// if minifier not set, default is no minification. source objects
// may still override this
$defaultMinifier = isset(self::$_options['minifiers'][$type])
? self::$_options['minifiers'][$type]
: false;
// process groups of sources with identical minifiers/options
$content = array();
$originalLength = 0;
$i = 0;
$l = count(self::$_controller->sources);
$groupToProcessTogether = array();
$lastMinifier = null;
$lastOptions = null;
do {
// get next source
$source = null;
if ($i < $l) {
$source = self::$_controller->sources[$i];
/* @var Minify_Source $source */
$sourceContent = $source->getContent();
$originalLength += strlen($sourceContent);
// allow the source to override our minifier and options
$minifier = (null !== $source->minifier)
? $source->minifier
: $defaultMinifier;
$options = (null !== $source->minifyOptions)
? array_merge($defaultOptions, $source->minifyOptions)
: $defaultOptions;
}
// do we need to process our group right now?
if ($i > 0 // yes, we have at least the first group populated
&& (
! $source // yes, we ran out of sources
|| $type === self::TYPE_CSS // yes, to process CSS individually (avoiding PCRE bugs/limits)
|| $minifier !== $lastMinifier // yes, minifier changed
|| $options !== $lastOptions) // yes, options changed
)
{
// minify previous sources with last settings
$imploded = implode($implodeSeparator, $groupToProcessTogether);
$groupToProcessTogether = array();
if ($lastMinifier) {
try {
$content[] = call_user_func($lastMinifier, $imploded, $lastOptions);
} catch (\Exception $e) {
throw new \Exception("Exception in minifier: " . $e->getMessage());
}
} else {
$content[] = $imploded;
}
}
// add content to the group
if ($source) {
$groupToProcessTogether[] = $sourceContent;
$lastMinifier = $minifier;
$lastOptions = $options;
}
$i++;
} while ($source);
$content = implode($implodeSeparator, $content);
if ($type === self::TYPE_CSS && false !== strpos($content, '@import')) {
$content = self::_handleCssImports($content);
}
if ( $type === self::TYPE_CSS ) {
$content = apply_filters( 'w3tc_minify_css_content', $content, null, null );
}
if ( $type === self::TYPE_JS ) {
$content = apply_filters( 'w3tc_minify_js_content', $content, null, null );
}
// do any post-processing (esp. for editing build URIs)
if (self::$_options['postprocessorRequire']) {
require_once self::$_options['postprocessorRequire'];
}
if (self::$_options['postprocessor']) {
$content = call_user_func(self::$_options['postprocessor'], $content, $type);
}
return array(
'originalLength' => $originalLength,
'content' => $content
);
}
/**
* Sets cache ID
* @param string $cacheId
*/
public static function setCacheId($cacheId = null)
{
self::$_cacheId = $cacheId;
}
/**
* Returns cache ID
*/
public static function getCacheId()
{
return self::$_cacheId;
}
/**
* Make a unique cache id for for this request.
*
* Any settings that could affect output are taken into consideration
*
* @param string $prefix
*
* @return string
*/
protected static function _getCacheId($prefix = 'minify')
{
return (self::$_cacheId ? self::$_cacheId : md5(serialize(array(
Minify_Source::getDigest(self::$_controller->sources)
,self::$_options['minifiers']
,self::$_options['minifierOptions']
,self::$_options['postprocessor']
,self::$_options['bubbleCssImports']
,self::$_options['processCssImports']
))));
}
/**
* Bubble CSS @imports to the top or prepend a warning if an import is detected not at the top.
*
* @param string $css
*
* @return string
*/
protected static function _handleCssImports($css)
{
if (self::$_options['bubbleCssImports']) {
// bubble CSS imports
preg_match_all('/@import.*?;/', $css, $imports);
$css = implode('', $imports[0]) . preg_replace('/@import.*?;/', '', $css);
} else if ('' !== self::$importWarning) {
// remove comments so we don't mistake { in a comment as a block
$noCommentCss = preg_replace('@/\\*[\\s\\S]*?\\*/@', '', $css);
$lastImportPos = strrpos($noCommentCss, '@import');
$firstBlockPos = strpos($noCommentCss, '{');
if (false !== $lastImportPos
&& false !== $firstBlockPos
&& $firstBlockPos < $lastImportPos
) {
// { appears before @import : prepend warning
$css = self::$importWarning . $css;
}
}
return $css;
}
}