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<?php
/**
* @copyright Copyright (c) 2022 John Molakvoæ <skjnldsv@protonmail.com>
*
* @author John Molakvoæ <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 OCA\Theming\Service;
use OCA\Theming\AppInfo\Application;
use OCA\Theming\Themes\DefaultTheme;
use OCP\IConfig;
use OCP\IURLGenerator;
use OCP\IUserSession;
use OCP\Util;
class ThemeInjectionService {
private IURLGenerator $urlGenerator;
private ThemesService $themesService;
private DefaultTheme $defaultTheme;
private IConfig $config;
private ?string $userId;
public function __construct(IURLGenerator $urlGenerator,
ThemesService $themesService,
DefaultTheme $defaultTheme,
IConfig $config,
IUserSession $userSession) {
$this->urlGenerator = $urlGenerator;
$this->themesService = $themesService;
$this->defaultTheme = $defaultTheme;
$this->config = $config;
if ($userSession->getUser() !== null) {
$this->userId = $userSession->getUser()->getUID();
} else {
$this->userId = null;
}
}
public function injectHeaders() {
$themes = $this->themesService->getThemes();
$defaultTheme = $themes[$this->defaultTheme->getId()];
$mediaThemes = array_filter($themes, function($theme) {
// Check if the theme provides a media query
return (bool)$theme->getMediaQuery();
});
// Default theme fallback
$this->addThemeHeader($defaultTheme->getId());
// Themes applied by media queries
foreach($mediaThemes as $theme) {
$this->addThemeHeader($theme->getId(), true, $theme->getMediaQuery());
}
// Themes
foreach($this->themesService->getThemes() as $theme) {
// Ignore default theme as already processed first
if ($theme->getId() === $this->defaultTheme->getId()) {
continue;
}
$this->addThemeHeader($theme->getId(), false);
}
}
/**
* Inject theme header into rendered page
*
* @param string $themeId the theme ID
* @param bool $plain request the :root syntax
* @param string $media media query to use in the <link> element
*/
private function addThemeHeader(string $themeId, bool $plain = true, string $media = null) {
$cacheBuster = $this->config->getAppValue('theming', 'cachebuster', '0');
if ($this->userId !== null) {
// need to bust the cache for the CSS file when the user background changed as its
// URL is served in those files
$userCacheBuster = $this->config->getUserValue($this->userId, Application::APP_ID, 'userCacheBuster', '0');
$cacheBuster .= $this->userId . '_' . $userCacheBuster;
}
$linkToCSS = $this->urlGenerator->linkToRoute('theming.Theming.getThemeStylesheet', [
'themeId' => $themeId,
'plain' => $plain,
'v' => substr(sha1($cacheBuster), 0, 8),
]);
Util::addHeader('link', [
'rel' => 'stylesheet',
'media' => $media,
'href' => $linkToCSS,
'class' => 'theme'
]);
}
}
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