nextcloud/lib/private/Template/IconsCacher.php

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<?php
/**
* @copyright Copyright (c) 2018, John Molakvoæ (skjnldsv@protonmail.com)
*
* @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
*
* @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 OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\Files\SimpleFS\ISimpleFile;
use OCP\ILogger;
use OCP\IURLGenerator;
use OC\Files\AppData\Factory;
class IconsCacher {
/** @var ILogger */
protected $logger;
/** @var IAppData */
protected $appData;
/** @var ISimpleFolder */
private $folder;
/** @var IURLGenerator */
protected $urlGenerator;
/** @var string */
private $iconVarRE = '/--(icon-[a-z0-9-]+): url\(["\']([a-z0-9-\/]+)[^;]+;/m';
/** @var string */
private $fileName = 'icons-vars.css';
/**
* @param ILogger $logger
* @param Factory $appDataFactory
* @param IURLGenerator $urlGenerator
*/
public function __construct(ILogger $logger,
Factory $appDataFactory,
IURLGenerator $urlGenerator) {
$this->logger = $logger;
$this->appData = $appDataFactory->get('css');
$this->urlGenerator = $urlGenerator;
try {
$this->folder = $this->appData->getFolder('icons');
} catch (NotFoundException $e) {
$this->folder = $this->appData->newFolder('icons');
}
}
private function getIconsFromCss(string $css): array{
preg_match_all($this->iconVarRE, $css, $matches, PREG_SET_ORDER);
$icons = [];
foreach ($matches as $icon) {
$icons[$icon[1]] = $icon[2];
}
return $icons;
}
/**
* Parse and cache css
*
* @param string $css
*/
public function setIconsCss(string $css) {
$cachedFile = $this->getCachedCSS();
if (!$cachedFile) {
$currentData = '';
} else {
$currentData = $cachedFile->getContent();
}
// remove :root
$currentData = str_replace([':root {', '}'], '', $currentData);
$icons = $this->getIconsFromCss($currentData . $css);
$data = '';
foreach ($icons as $icon => $url) {
$data .= "--$icon: url('$url?v=1');";
}
if (strlen($data) > 0) {
if (!$cachedFile) {
$cachedFile = $this->folder->newFile($this->fileName);
}
$data = ":root {
$data
}";
$cachedFile->putContent($data);
}
return preg_replace($this->iconVarRE, '', $css);
}
/**
* Get icons css file
* @return ISimpleFile|boolean
*/
public function getCachedCSS() {
try {
return $this->folder->getFile($this->fileName);
} catch (NotFoundException $e) {
return false;
}
}
public function injectCss() {
// Only inject once
foreach (\OC_Util::$headers as $header) {
if (
array_key_exists('attributes', $header) &&
array_key_exists('href', $header['attributes']) &&
strpos($header['attributes']['href'], $this->fileName) !== false) {
return;
}
}
$linkToCSS = substr($this->urlGenerator->linkToRoute('core.Css.getCss', ['appName' => 'icons', 'fileName' => $this->fileName]), strlen(\OC::$WEBROOT));
\OC_Util::addHeader('link', ['rel' => 'stylesheet', 'href' => $linkToCSS], null, true);
}
}