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<?php
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/**
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* @package Grav\Common\Assets
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*
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* @copyright Copyright (c) 2015 - 2021 Trilby Media, LLC. All rights reserved.
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* @license MIT License; see LICENSE file for details.
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*/
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namespace Grav\Common\Assets;
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use Grav\Common\Assets\Traits\AssetUtilsTrait;
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use Grav\Common\Config\Config;
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use Grav\Common\Grav;
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use Grav\Common\Uri;
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use Grav\Common\Utils;
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use Grav\Framework\Object\PropertyObject;
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use MatthiasMullie\Minify\CSS;
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use MatthiasMullie\Minify\JS;
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use RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
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use function array_key_exists;
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/**
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* Class Pipeline
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* @package Grav\Common\Assets
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*/
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class Pipeline extends PropertyObject
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{
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use AssetUtilsTrait;
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protected const CSS_ASSET = true;
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protected const JS_ASSET = false;
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/** @const Regex to match CSS urls */
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protected const CSS_URL_REGEX = '{url\(([\'\"]?)(.*?)\1\)}';
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/** @const Regex to match CSS sourcemap comments */
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protected const CSS_SOURCEMAP_REGEX = '{\/\*# (.*?) \*\/}';
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protected const FIRST_FORWARDSLASH_REGEX = '{^\/{1}\w}';
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// Following variables come from the configuration:
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/** @var bool */
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protected $css_minify = false;
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/** @var bool */
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protected $css_minify_windows = false;
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/** @var bool */
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protected $css_rewrite = false;
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/** @var bool */
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protected $css_pipeline_include_externals = true;
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/** @var bool */
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protected $js_minify = false;
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/** @var bool */
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protected $js_minify_windows = false;
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/** @var bool */
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protected $js_pipeline_include_externals = true;
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/** @var string */
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protected $assets_dir;
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/** @var string */
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protected $assets_url;
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/** @var string */
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protected $timestamp;
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/** @var array */
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protected $attributes;
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/** @var string */
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protected $query = '';
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/** @var string */
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protected $asset;
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/**
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* Pipeline constructor.
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* @param array $elements
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* @param string|null $key
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*/
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public function __construct(array $elements = [], ?string $key = null)
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{
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parent::__construct($elements, $key);
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/** @var UniformResourceLocator $locator */
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$locator = Grav::instance()['locator'];
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/** @var Config $config */
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$config = Grav::instance()['config'];
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/** @var Uri $uri */
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$uri = Grav::instance()['uri'];
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$this->base_url = rtrim($uri->rootUrl($config->get('system.absolute_urls')), '/') . '/';
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$this->assets_dir = $locator->findResource('asset://') . DS;
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$this->assets_url = $locator->findResource('asset://', false);
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}
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/**
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* Minify and concatenate CSS
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*
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* @param array $assets
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* @param string $group
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* @param array $attributes
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* @return bool|string URL or generated content if available, else false
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*/
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public function renderCss($assets, $group, $attributes = [])
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{
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// temporary list of assets to pipeline
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$inline_group = false;
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if (array_key_exists('loading', $attributes) && $attributes['loading'] === 'inline') {
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$inline_group = true;
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unset($attributes['loading']);
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}
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// Store Attributes
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$this->attributes = array_merge(['type' => 'text/css', 'rel' => 'stylesheet'], $attributes);
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// Compute uid based on assets and timestamp
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$json_assets = json_encode($assets);
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$uid = md5($json_assets . $this->css_minify . $this->css_rewrite . $group);
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$file = $uid . '.css';
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$relative_path = "{$this->base_url}{$this->assets_url}/{$file}";
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$buffer = null;
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if (file_exists($this->assets_dir . $file)) {
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$buffer = file_get_contents($this->assets_dir . $file) . "\n";
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} else {
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//if nothing found get out of here!
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if (empty($assets)) {
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return false;
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}
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// Concatenate files
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$buffer = $this->gatherLinks($assets, self::CSS_ASSET);
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// Minify if required
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if ($this->shouldMinify('css')) {
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$minifier = new CSS();
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$minifier->add($buffer);
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$buffer = $minifier->minify();
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}
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// Write file
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if (trim($buffer) !== '') {
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file_put_contents($this->assets_dir . $file, $buffer);
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}
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}
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if ($inline_group) {
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$output = "<style>\n" . $buffer . "\n</style>\n";
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} else {
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$this->asset = $relative_path;
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$output = '<link href="' . $relative_path . $this->renderQueryString() . '"' . $this->renderAttributes() . ">\n";
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}
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return $output;
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}
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/**
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* Minify and concatenate JS files.
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*
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* @param array $assets
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* @param string $group
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* @param array $attributes
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* @return bool|string URL or generated content if available, else false
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*/
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public function renderJs($assets, $group, $attributes = [])
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{
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// temporary list of assets to pipeline
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$inline_group = false;
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if (array_key_exists('loading', $attributes) && $attributes['loading'] === 'inline') {
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$inline_group = true;
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unset($attributes['loading']);
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}
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// Store Attributes
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$this->attributes = $attributes;
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// Compute uid based on assets and timestamp
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$json_assets = json_encode($assets);
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$uid = md5($json_assets . $this->js_minify . $group);
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$file = $uid . '.js';
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$relative_path = "{$this->base_url}{$this->assets_url}/{$file}";
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$buffer = null;
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if (file_exists($this->assets_dir . $file)) {
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$buffer = file_get_contents($this->assets_dir . $file) . "\n";
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} else {
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//if nothing found get out of here!
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if (empty($assets)) {
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return false;
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}
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// Concatenate files
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$buffer = $this->gatherLinks($assets, self::JS_ASSET);
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// Minify if required
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if ($this->shouldMinify('js')) {
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$minifier = new JS();
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$minifier->add($buffer);
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$buffer = $minifier->minify();
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}
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// Write file
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if (trim($buffer) !== '') {
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file_put_contents($this->assets_dir . $file, $buffer);
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}
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}
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if ($inline_group) {
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$output = '<script' . $this->renderAttributes(). ">\n" . $buffer . "\n</script>\n";
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} else {
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$this->asset = $relative_path;
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$output = '<script src="' . $relative_path . $this->renderQueryString() . '"' . $this->renderAttributes() . "></script>\n";
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}
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return $output;
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}
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/**
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* Finds relative CSS urls() and rewrites the URL with an absolute one
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*
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* @param string $file the css source file
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* @param string $dir , $local relative path to the css file
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* @param bool $local is this a local or remote asset
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* @return string
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*/
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protected function cssRewrite($file, $dir, $local)
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{
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// Strip any sourcemap comments
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$file = preg_replace(self::CSS_SOURCEMAP_REGEX, '', $file);
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// Find any css url() elements, grab the URLs and calculate an absolute path
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// Then replace the old url with the new one
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$file = (string)preg_replace_callback(self::CSS_URL_REGEX, function ($matches) use ($dir, $local) {
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$old_url = $matches[2];
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// Ensure link is not rooted to web server, a data URL, or to a remote host
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if (preg_match(self::FIRST_FORWARDSLASH_REGEX, $old_url) || Utils::startsWith($old_url, 'data:') || $this->isRemoteLink($old_url)) {
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return $matches[0];
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}
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// clean leading /
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$old_url = Utils::normalizePath($dir . '/' . $old_url);
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if (preg_match(self::FIRST_FORWARDSLASH_REGEX, $old_url)) {
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$old_url = ltrim($old_url, '/');
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}
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$new_url = ($local ? $this->base_url: '') . $old_url;
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return str_replace($matches[2], $new_url, $matches[0]);
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}, $file);
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return $file;
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}
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/**
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* @param string $type
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* @return bool
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*/
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private function shouldMinify($type = 'css')
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{
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$check = $type . '_minify';
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$win_check = $type . '_minify_windows';
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$minify = (bool) $this->$check;
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// If this is a Windows server, and minify_windows is false (default value) skip the
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// minification process because it will cause Apache to die/crash due to insufficient
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// ThreadStackSize in httpd.conf - See: https://bugs.php.net/bug.php?id=47689
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if (stripos(php_uname('s'), 'WIN') === 0 && !$this->{$win_check}) {
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$minify = false;
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}
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return $minify;
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}
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}
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