nextcloud-breeze-dark/lib/AppInfo/Application.php

<?php

declare(strict_types=1);

/**
 * Breeze Dark theme for Nextcloud
 *
 * @copyright Copyright (C) 2020  Magnus Walbeck <mw@mwalbeck.org>
 *
 * @author Magnus Walbeck <mw@mwalbeck.org>
 *
 * @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\BreezeDark\AppInfo;

use OCP\AppFramework\App;
use OCP\AppFramework\Bootstrap\IBootContext;
use OCP\AppFramework\Bootstrap\IBootstrap;
use OCP\AppFramework\Bootstrap\IRegistrationContext;
use OCP\IConfig;
use OCP\IUserSession;
use OCP\Util;
use OCP\IURLGenerator;
use OCP\AppFramework\Http\Events\BeforeTemplateRenderedEvent;
use OCA\BreezeDark\Listener\BeforeTemplateRenderedListener;

class Application extends App implements IBootstrap
{

    /** @var string */
    public const APP_NAME = 'breezedark';

    /** @var string */
    protected $appName;

    public function __construct()
    {
        parent::__construct(self::APP_NAME);
        $this->appName  = self::APP_NAME;
    }

    public function register(IRegistrationContext $context): void
    {
        $context->registerEventListener(BeforeTemplateRenderedEvent::class, BeforeTemplateRenderedListener::class);
    }

    public function boot(IBootContext $context): void
    {
        $context->injectFn([$this, 'doTheming']);
    }

    /**
     * Check if the theme should be applied
     *
     * @param IConfig $config
     * @param IUserSession $userSession
     * @param IURLGenerator $urlGenerator
     */
    public function doTheming(IConfig $config, IUserSession $userSession, IURLGenerator $urlGenerator): void
    {
        $user = $userSession->getUser();
        $enforced = $config->getAppValue($this->appName, "theme_enforced", "0");
        $loginPage = $config->getAppValue($this->appName, "theme_login_page", "1");
        $cachebuster = $config->getAppValue($this->appName, "theme_cachebuster", "0");
        $automaticActivation = $config->getAppValue($this->appName, "theme_automatic_activation_enabled", "0");

        if ($enforced) {
            if (!is_null($user)) {
                $automaticActivation = $config->getUserValue($user->getUID(), $this->appName, "theme_automatic_activation_enabled", $automaticActivation);
            }
            $this->addStyling($urlGenerator, $loginPage, $cachebuster, $automaticActivation);
        } elseif (!is_null($user) and $config->getUserValue($user->getUID(), $this->appName, "theme_enabled", "0")) {
            // When shown the 2FA login page you are logged in while also being on a login page,
            // so a logged in user still needs the guests.css stylesheet
            $this->addStyling($urlGenerator, $loginPage, $cachebuster, $config->getUserValue($user->getUID(), $this->appName, "theme_automatic_activation_enabled", "0"));
        }
    }

    /**
     * Add stylesheet(s) to nextcloud
     *
     * @param IURLGenerator $urlGenerator
     * @param string $loginPage
     * @param string $cachebuster
     * @param string $automaticActivation
     */
    public function addStyling(IURLGenerator $urlGenerator, string $loginPage, string $cachebuster, string $automaticActivation): void
    {
        if ($automaticActivation) {
            Util::addStyle($this->appName, 'server-automatic');
        } else {
            Util::addStyle($this->appName, 'server');
        }
        Util::addScript($this->appName, 'breezedark');

        // If the styling for the login page is wanted, load the stylesheet.
        if ($loginPage) {
            if ($automaticActivation) {
                Util::addStyle($this->appName, 'guest-automatic');
            } else {
                Util::addStyle($this->appName, 'guest');
            }
        }

        // Only request the stylesheet if there is any styling to request
        if ($cachebuster) {
            $linkToCustomStyling = $urlGenerator->linkToRoute(
                'breezedark.Theming.getCustomStyling',
                ['v' => $cachebuster,]
            );
            Util::addHeader(
                'link',
                [
                    'rel' => 'stylesheet',
                    'href' => $linkToCustomStyling,
                ]
            );
        }
    }
}