nextcloud/apps/accessibility/lib/Controller/AccessibilityController.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2018 John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
* @copyright Copyright (c) 2019 Janis Köhr <janiskoehr@icloud.com>
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Janis Köhr <janis.koehr@novatec-gmbh.de>
* @author Joas Schilling <coding@schilljs.com>
* @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
* @author Julius Härtl <jus@bitgrid.net>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Citharel <nextcloud@tcit.fr>
*
* @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 OCA\Accessibility\Controller;
use OC\Template\IconsCacher;
use OCP\App\IAppManager;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\DataDisplayResponse;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use OCP\ILogger;
use OCP\IRequest;
use OCP\IUserSession;
use ScssPhp\ScssPhp\Compiler;
use ScssPhp\ScssPhp\Exception\ParserException;
use ScssPhp\ScssPhp\Formatter\Crunched;
class AccessibilityController extends Controller {
/** @var string */
protected $appName;
/** @var string */
protected $serverRoot;
/** @var IConfig */
private $config;
/** @var ILogger */
private $logger;
/** @var ITimeFactory */
protected $timeFactory;
/** @var IUserSession */
private $userSession;
/** @var IconsCacher */
protected $iconsCacher;
/** @var \OC_Defaults */
private $defaults;
/** @var null|string */
private $injectedVariables;
/** @var string */
private $appRoot;
public function __construct(string $appName,
IRequest $request,
IConfig $config,
ILogger $logger,
ITimeFactory $timeFactory,
IUserSession $userSession,
IAppManager $appManager,
IconsCacher $iconsCacher,
\OC_Defaults $defaults) {
parent::__construct($appName, $request);
$this->appName = $appName;
$this->config = $config;
$this->logger = $logger;
$this->timeFactory = $timeFactory;
$this->userSession = $userSession;
$this->iconsCacher = $iconsCacher;
$this->defaults = $defaults;
$this->serverRoot = \OC::$SERVERROOT;
$this->appRoot = $appManager->getAppPath($this->appName);
}
/**
* @PublicPage
* @NoCSRFRequired
* @NoSameSiteCookieRequired
*
* @return DataDisplayResponse
*/
public function getCss(): DataDisplayResponse {
$css = '';
$imports = '';
if ($this->userSession->isLoggedIn()) {
$userValues = $this->getUserValues();
} else {
$userValues = ['dark'];
}
foreach ($userValues as $key => $scssFile) {
if ($scssFile !== false) {
if ($scssFile === 'highcontrast' && in_array('dark', $userValues)) {
$scssFile .= 'dark';
}
$imports .= '@import "' . $scssFile . '";';
}
}
if ($imports !== '') {
$scss = new Compiler();
$scss->setImportPaths([
$this->appRoot . '/css/',
$this->serverRoot . '/core/css/'
]);
// Continue after throw
$scss->setIgnoreErrors(true);
$scss->setFormatter(Crunched::class);
// Import theme, variables and compile css4 variables
try {
$css .= $scss->compile(
$imports .
$this->getInjectedVariables() .
'@import "variables.scss";' .
'@import "css-variables.scss";'
);
} catch (ParserException $e) {
$this->logger->error($e->getMessage(), ['app' => 'core']);
}
}
// We don't want to override vars with url since path is different
$css = $this->filterOutRule('/--[a-z-:]+url\([^;]+\)/mi', $css);
// Rebase all urls
$appWebRoot = substr($this->appRoot, strlen($this->serverRoot) - strlen(\OC::$WEBROOT));
$css = $this->rebaseUrls($css, $appWebRoot . '/css');
if (in_array('dark', $userValues) && $this->iconsCacher->getCachedList() && $this->iconsCacher->getCachedList()->getSize() > 0) {
$iconsCss = $this->invertSvgIconsColor($this->iconsCacher->getCachedList()->getContent());
$css = $css . $iconsCss;
}
$response = new DataDisplayResponse($css, Http::STATUS_OK, ['Content-Type' => 'text/css']);
// Set cache control
$ttl = 31536000;
$response->addHeader('Cache-Control', 'max-age=' . $ttl . ', immutable');
$expires = new \DateTime();
$expires->setTimestamp($this->timeFactory->getTime());
$expires->add(new \DateInterval('PT' . $ttl . 'S'));
$response->addHeader('Expires', $expires->format(\DateTime::RFC1123));
$response->addHeader('Pragma', 'cache');
// store current cache hash
if ($this->userSession->isLoggedIn()) {
$this->config->setUserValue($this->userSession->getUser()->getUID(), $this->appName, 'icons-css', md5($css));
}
return $response;
}
/**
* Return an array with the user theme & font settings
*
* @return array
*/
private function getUserValues(): array {
$userTheme = $this->config->getUserValue($this->userSession->getUser()->getUID(), $this->appName, 'theme', false);
$userFont = $this->config->getUserValue($this->userSession->getUser()->getUID(), $this->appName, 'font', false);
$userHighContrast = $this->config->getUserValue($this->userSession->getUser()->getUID(), $this->appName, 'highcontrast', false);
return [$userTheme, $userHighContrast, $userFont];
}
/**
* Remove all matches from the $rule regex
*
* @param string $rule regex to match
* @param string $css string to parse
* @return string
*/
private function filterOutRule(string $rule, string $css): string {
return preg_replace($rule, '', $css);
}
/**
* Add the correct uri prefix to make uri valid again
*
* @param string $css
* @param string $webDir
* @return string
*/
private function rebaseUrls(string $css, string $webDir): string {
$re = '/url\([\'"]([^\/][\.\w?=\/-]*)[\'"]\)/x';
$subst = 'url(\'' . $webDir . '/$1\')';
return preg_replace($re, $subst, $css);
}
/**
* Remove all matches from the $rule regex
*
* @param string $css string to parse
* @return string
*/
private function invertSvgIconsColor(string $css) {
return str_replace(
['color=000&', 'color=fff&', 'color=***&'],
['color=***&', 'color=000&', 'color=fff&'],
str_replace(
['color=000000&', 'color=ffffff&', 'color=******&'],
['color=******&', 'color=000000&', 'color=ffffff&'],
$css
)
);
}
/**
* @return string SCSS code for variables from OC_Defaults
*/
private function getInjectedVariables(): string {
if ($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) {
$this->logger->logException($e, ['app' => 'core']);
}
return $variables;
}
}