mediawiki-skins-Vector/includes/SkinVersionLookup.php

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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @since 1.35
*/
namespace Vector;
use Config;
use User;
use WebRequest;
/**
* Given initial dependencies, retrieve the current skin version. This class does no parsing, just
* the lookup.
*
* Skin version is evaluated in the following order:
*
* - useskinversion URL query parameter override. See readme.
*
* - User preference. The User object for new accounts is updated (persisted as a user preference)
* by hook according to VectorDefaultSkinVersionForNewAccounts. See Hooks and skin.json. The user
* may then change the preference at will.
*
* - Site configuration default. The default is controlled by VectorDefaultSkinVersion and
* VectorDefaultSkinVersionForExistingAccounts based on login state. The former is used
* for anonymous users and as a fallback configuration, the latter is logged in users (existing
* accounts). See skin.json.
*
* @unstable
*
* @package Vector
* @internal
*/
final class SkinVersionLookup {
/**
* @var WebRequest
*/
private $request;
/**
* @var User
*/
private $user;
/**
* @var Config
*/
private $config;
/**
* This constructor accepts all dependencies needed to obtain the skin version. The dependencies
* are lazily evaluated, not cached, meaning they always return the current results.
*
* @param WebRequest $request
* @param User $user
* @param Config $config
*/
public function __construct( WebRequest $request, User $user, Config $config ) {
$this->request = $request;
$this->user = $user;
$this->config = $config;
}
/**
* Whether or not the legacy skin is being used.
*
* @return bool
* @throws \ConfigException
*/
public function isLegacy(): bool {
return $this->getVersion() === Constants::SKIN_VERSION_LEGACY;
}
/**
* The skin version as a string. E.g., `Constants::SKIN_VERSION_LATEST`,
* `Constants::SKIN_VERSION_LATEST`, or maybe 'beta'. Note: it's likely someone will put arbitrary
* strings in the query parameter which means this function returns those strings as is.
*
* @return string
* @throws \ConfigException
*/
public function getVersion(): string {
// Obtain the skin version from the 1) `useskinversion` URL query parameter override, 2) the
// user preference, 3) the configured default for logged in users, 4) or the site default.
//
// The latter two configurations cannot be set by `Hooks::onUserGetDefaultOptions()` as user
// sessions are unavailable at that time so it's not possible to determine whether the
// preference is for a logged in user or an anonymous user. Since new users are known to have
// had their user preferences initialized in `Hooks::onLocalUserCreated()`, that means all
// subsequent requests to `User->getOption()` that do not have a preference set are either
// existing accounts or anonymous users. Login state makes the distinction.
return (string)$this->request->getVal(
Constants::QUERY_PARAM_SKIN_VERSION,
$this->user->getOption(
Constants::PREF_KEY_SKIN_VERSION,
$this->config->get(
$this->user->isRegistered()
? Constants::CONFIG_KEY_DEFAULT_SKIN_VERSION_FOR_EXISTING_ACCOUNTS
: Constants::CONFIG_KEY_DEFAULT_SKIN_VERSION
)
)
);
}
}