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<?php
/**
* @copyright Copyright (c) 2016, John Molakvoæ (skjnldsv@protonmail.com)
*
* @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
* @author Julius Haertl <jus@bitgrid.net>
* @author Julius Härtl <jus@bitgrid.net>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Template;
use Leafo\ScssPhp\Compiler;
use Leafo\ScssPhp\Exception\ParserException;
use Leafo\ScssPhp\Formatter\Crunched;
use Leafo\ScssPhp\Formatter\Expanded;
use OC\Files\AppData\Factory;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\Files\SimpleFS\ISimpleFile;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\ILogger;
use OCP\IURLGenerator;
class SCSSCacher {
/** @var ILogger */
protected $logger;
/** @var IAppData */
protected $appData;
/** @var IURLGenerator */
protected $urlGenerator;
/** @var IConfig */
protected $config;
/** @var string */
protected $serverRoot;
/** @var ICache */
protected $depsCache;
/** @var null|string */
protected $injectedVariables = null;
/** @var ICacheFactory */
private $cacheFactory;
/**
* @param ILogger $logger
* @param Factory $appDataFactory
* @param IURLGenerator $urlGenerator
* @param IConfig $config
* @param \OC_Defaults $defaults
* @param string $serverRoot
* @param ICacheFactory $cacheFactory
*/
public function __construct(ILogger $logger,
Factory $appDataFactory,
IURLGenerator $urlGenerator,
IConfig $config,
\OC_Defaults $defaults,
$serverRoot,
ICacheFactory $cacheFactory) {
$this->logger = $logger;
$this->appData = $appDataFactory->get('css');
$this->urlGenerator = $urlGenerator;
$this->config = $config;
$this->defaults = $defaults;
$this->serverRoot = $serverRoot;
$this->cacheFactory = $cacheFactory;
$this->depsCache = $cacheFactory->createDistributed('SCSS-' . md5($this->urlGenerator->getBaseUrl()));
}
/**
* Process the caching process if needed
* @param string $root Root path to the nextcloud installation
* @param string $file
* @param string $app The app name
* @return boolean
*/
public function process($root, $file, $app) {
$path = explode('/', $root . '/' . $file);
$fileNameSCSS = array_pop($path);
$fileNameCSS = $this->prependVersionPrefix($this->prependBaseurlPrefix(str_replace('.scss', '.css', $fileNameSCSS)), $app);
$path = implode('/', $path);
$webDir = $this->getWebDir($path, $app, $this->serverRoot, \OC::$WEBROOT);
try {
$folder = $this->appData->getFolder($app);
} catch(NotFoundException $e) {
// creating css appdata folder
$folder = $this->appData->newFolder($app);
}
if(!$this->variablesChanged() && $this->isCached($fileNameCSS, $folder)) {
return true;
}
return $this->cache($path, $fileNameCSS, $fileNameSCSS, $folder, $webDir);
}
/**
* @param $appName
* @param $fileName
* @return ISimpleFile
*/
public function getCachedCSS($appName, $fileName) {
$folder = $this->appData->getFolder($appName);
$cachedFileName = $this->prependVersionPrefix($this->prependBaseurlPrefix($fileName), $appName);
return $folder->getFile($cachedFileName);
}
/**
* Check if the file is cached or not
* @param string $fileNameCSS
* @param ISimpleFolder $folder
* @return boolean
*/
private function isCached($fileNameCSS, ISimpleFolder $folder) {
try {
$cachedFile = $folder->getFile($fileNameCSS);
if ($cachedFile->getSize() > 0) {
$depFileName = $fileNameCSS . '.deps';
$deps = $this->depsCache->get($folder->getName() . '-' . $depFileName);
if ($deps === null) {
$depFile = $folder->getFile($depFileName);
$deps = $depFile->getContent();
//Set to memcache for next run
$this->depsCache->set($folder->getName() . '-' . $depFileName, $deps);
}
$deps = json_decode($deps, true);
foreach ($deps as $file=>$mtime) {
if (!file_exists($file) || filemtime($file) > $mtime) {
return false;
}
}
return true;
}
return false;
} catch(NotFoundException $e) {
return false;
}
}
/**
* Check if the variables file has changed
* @return bool
*/
private function variablesChanged() {
$injectedVariables = $this->getInjectedVariables();
if($this->config->getAppValue('core', 'scss.variables') !== md5($injectedVariables)) {
$this->resetCache();
$this->config->setAppValue('core', 'scss.variables', md5($injectedVariables));
return true;
}
return false;
}
/**
* Cache the file with AppData
* @param string $path
* @param string $fileNameCSS
* @param string $fileNameSCSS
* @param ISimpleFolder $folder
* @param string $webDir
* @return boolean
*/
private function cache($path, $fileNameCSS, $fileNameSCSS, ISimpleFolder $folder, $webDir) {
$scss = new Compiler();
$scss->setImportPaths([
$path,
$this->serverRoot . '/core/css/',
]);
// Continue after throw
$scss->setIgnoreErrors(true);
if($this->config->getSystemValue('debug')) {
// Debug mode
$scss->setFormatter(Expanded::class);
$scss->setLineNumberStyle(Compiler::LINE_COMMENTS);
} else {
// Compression
$scss->setFormatter(Crunched::class);
}
try {
$cachedfile = $folder->getFile($fileNameCSS);
} catch(NotFoundException $e) {
$cachedfile = $folder->newFile($fileNameCSS);
}
$depFileName = $fileNameCSS . '.deps';
try {
$depFile = $folder->getFile($depFileName);
} catch (NotFoundException $e) {
$depFile = $folder->newFile($depFileName);
}
// Compile
try {
$compiledScss = $scss->compile(
'@import "variables.scss";' .
$this->getInjectedVariables() .
'@import "'.$fileNameSCSS.'";');
} catch(ParserException $e) {
$this->logger->error($e, ['app' => 'core']);
return false;
}
// Gzip file
try {
$gzipFile = $folder->getFile($fileNameCSS . '.gzip'); # Safari doesn't like .gz
} catch (NotFoundException $e) {
$gzipFile = $folder->newFile($fileNameCSS . '.gzip'); # Safari doesn't like .gz
}
try {
$data = $this->rebaseUrls($compiledScss, $webDir);
$cachedfile->putContent($data);
$deps = json_encode($scss->getParsedFiles());
$depFile->putContent($deps);
$this->depsCache->set($folder->getName() . '-' . $depFileName, $deps);
$gzipFile->putContent(gzencode($data, 9));
$this->logger->debug('SCSSCacher: '.$webDir.'/'.$fileNameSCSS.' compiled and successfully cached', ['app' => 'core']);
return true;
} catch(NotPermittedException $e) {
$this->logger->error('SCSSCacher: unable to cache: ' . $fileNameSCSS);
return false;
}
}
/**
* Reset scss cache by deleting all generated css files
* We need to regenerate all files when variables change
*/
public function resetCache() {
$this->injectedVariables = null;
$this->cacheFactory->createDistributed('SCSS-')->clear();
$appDirectory = $this->appData->getDirectoryListing();
foreach ($appDirectory as $folder) {
foreach ($folder->getDirectoryListing() as $file) {
try {
$file->delete();
} catch(NotPermittedException $e) {
$this->logger->logException($e, ['message' => 'SCSSCacher: unable to delete file: ' . $file->getName()]);
}
}
}
}
/**
* @return string SCSS code for variables from OC_Defaults
*/
private function getInjectedVariables() {
if ($this->injectedVariables !== null)
return $this->injectedVariables;
$variables = '';
foreach ($this->defaults->getScssVariables() as $key => $value) {
$variables .= '$' . $key . ': ' . $value . ';';
}
// check for valid variables / otherwise fall back to defaults
try {
$scss = new Compiler();
$scss->compile($variables);
$this->injectedVariables = $variables;
} catch (ParserException $e) {
$this->logger->error($e, ['app' => 'core']);
}
return $variables;
}
/**
* Add the correct uri prefix to make uri valid again
* @param string $css
* @param string $webDir
* @return string
*/
private function rebaseUrls($css, $webDir) {
$re = '/url\([\'"]([^\/][\.\w?=\/-]*)[\'"]\)/x';
$subst = 'url(\''.$webDir.'/$1\')';
return preg_replace($re, $subst, $css);
}
/**
* Return the cached css file uri
* @param string $appName the app name
* @param string $fileName
* @return string
*/
public function getCachedSCSS($appName, $fileName) {
$tmpfileLoc = explode('/', $fileName);
$fileName = array_pop($tmpfileLoc);
$fileName = $this->prependVersionPrefix($this->prependBaseurlPrefix(str_replace('.scss', '.css', $fileName)), $appName);
return substr($this->urlGenerator->linkToRoute('core.Css.getCss', ['fileName' => $fileName, 'appName' => $appName]), strlen(\OC::$WEBROOT) + 1);
}
/**
* Prepend hashed base url to the css file
* @param string $cssFile
* @return string
*/
private function prependBaseurlPrefix($cssFile) {
$frontendController = ($this->config->getSystemValue('htaccess.IgnoreFrontController', false) === true || getenv('front_controller_active') === 'true');
return substr(md5($this->urlGenerator->getBaseUrl() . $frontendController), 0, 4) . '-' . $cssFile;
}
/**
* Prepend hashed app version hash
* @param string $cssFile
* @param string $appId
* @return string
*/
private function prependVersionPrefix($cssFile, $appId) {
$appVersion = \OC_App::getAppVersion($appId);
if ($appVersion !== '0') {
return substr(md5($appVersion), 0, 4) . '-' . $cssFile;
}
$coreVersion = \OC_Util::getVersionString();
return substr(md5($coreVersion), 0, 4) . '-' . $cssFile;
}
/**
* Get WebDir root
* @param string $path the css file path
* @param string $appName the app name
* @param string $serverRoot the server root path
* @param string $webRoot the nextcloud installation root path
* @return string the webDir
*/
private function getWebDir($path, $appName, $serverRoot, $webRoot) {
// Detect if path is within server root AND if path is within an app path
if ( strpos($path, $serverRoot) === false && $appWebPath = \OC_App::getAppWebPath($appName)) {
// Get the file path within the app directory
$appDirectoryPath = explode($appName, $path)[1];
// Remove the webroot
return str_replace($webRoot, '', $appWebPath.$appDirectoryPath);
}
return $webRoot.substr($path, strlen($serverRoot));
}
}