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<?php
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\Theming\Service;
use OCA\Theming\ITheme;
use OCA\Theming\Themes\DefaultTheme;
use OCA\Theming\Util;
use OCP\IConfig;
use OCP\IURLGenerator;
use OCP\IUserSession;
class ThemeInjectionService {
private IURLGenerator $urlGenerator;
private ThemesService $themesService;
private DefaultTheme $defaultTheme;
private Util $util;
private IConfig $config;
private ?string $userId;
public function __construct(IURLGenerator $urlGenerator,
ThemesService $themesService,
DefaultTheme $defaultTheme,
Util $util,
IConfig $config,
IUserSession $userSession) {
$this->urlGenerator = $urlGenerator;
$this->themesService = $themesService;
$this->defaultTheme = $defaultTheme;
$this->util = $util;
$this->config = $config;
if ($userSession->getUser() !== null) {
$this->userId = $userSession->getUser()->getUID();
} else {
$this->userId = null;
}
}
public function injectHeaders(): void {
$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
$this->addThemeHeaders($defaultTheme);
// Themes applied by media queries
foreach($mediaThemes as $theme) {
$this->addThemeHeaders($theme, true, $theme->getMediaQuery());
}
// Themes
foreach($this->themesService->getThemes() as $theme) {
// Ignore default theme as already processed first
if ($theme->getId() === $this->defaultTheme->getId()) {
continue;
}
$this->addThemeHeaders($theme, false);
}
// Meta headers
$this->addThemeMetaHeaders($themes);
}
/**
* Inject theme header into rendered page
*
* @param ITheme $theme the theme
* @param bool $plain request the :root syntax
* @param string $media media query to use in the <link> element
*/
private function addThemeHeaders(ITheme $theme, bool $plain = true, ?string $media = null): void {
$linkToCSS = $this->urlGenerator->linkToRoute('theming.Theming.getThemeStylesheet', [
'themeId' => $theme->getId(),
'plain' => $plain,
'v' => $this->util->getCacheBuster(),
]);
\OCP\Util::addHeader('link', [
'rel' => 'stylesheet',
'media' => $media,
'href' => $linkToCSS,
'class' => 'theme'
]);
}
/**
* Inject meta headers into rendered page
*
* @param ITheme[] $themes the theme
*/
private function addThemeMetaHeaders(array $themes): void {
$metaHeaders = [];
// Meta headers
foreach($this->themesService->getThemes() as $theme) {
if (!empty($theme->getMeta())) {
foreach($theme->getMeta() as $meta) {
if (!isset($meta['name']) || !isset($meta['content'])) {
continue;
}
if (!isset($metaHeaders[$meta['name']])) {
$metaHeaders[$meta['name']] = [];
}
$metaHeaders[$meta['name']][] = $meta['content'];
}
}
}
foreach($metaHeaders as $name => $content) {
\OCP\Util::addHeader('meta', [
'name' => $name,
'content' => join(' ', array_unique($content)),
]);
}
}
}
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