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CentralIdLookupFactory.php
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CentralIdLookupFactory.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
*/
namespace MediaWiki\User\CentralId;
use InvalidArgumentException;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\MainConfigNames;
use MediaWiki\User\UserFactory;
use MediaWiki\User\UserIdentityLookup;
use Wikimedia\ObjectFactory\ObjectFactory;
/**
* @since 1.37
* @ingroup User
*/
class CentralIdLookupFactory {
/**
* @internal
*/
public const CONSTRUCTOR_OPTIONS = [
MainConfigNames::CentralIdLookupProviders,
MainConfigNames::CentralIdLookupProvider,
];
/** @var array ObjectFactory specs indexed by provider name */
private $providers;
/** @var string */
private $defaultProvider;
private ObjectFactory $objectFactory;
private UserIdentityLookup $userIdentityLookup;
private UserFactory $userFactory;
/** @var CentralIdLookup[] */
private $instanceCache = [];
public function __construct(
ServiceOptions $options,
ObjectFactory $objectFactory,
UserIdentityLookup $userIdentityLookup,
UserFactory $userFactory
) {
$options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
$this->providers = $options->get( MainConfigNames::CentralIdLookupProviders );
$this->defaultProvider = $options->get( MainConfigNames::CentralIdLookupProvider );
$this->objectFactory = $objectFactory;
$this->userIdentityLookup = $userIdentityLookup;
$this->userFactory = $userFactory;
}
/**
* Get the IDs of the registered central ID lookup providers.
*
* @return string[]
*/
public function getProviderIds(): array {
return array_keys( $this->providers );
}
/**
* Get the ID of the default central ID provider.
*/
public function getDefaultProviderId(): string {
return $this->defaultProvider;
}
/**
* Get an instance of a CentralIdLookup.
*
* @param string|null $providerId Provider ID from $wgCentralIdLookupProviders or null
* to use the provider configured in $wgCentralIdLookupProvider
* @return CentralIdLookup
* @throws InvalidArgumentException if $providerId is not properly configured
*/
public function getLookup( ?string $providerId = null ): CentralIdLookup {
$providerId ??= $this->defaultProvider;
if ( !array_key_exists( $providerId, $this->instanceCache ) ) {
$providerSpec = $this->providers[$providerId] ?? null;
if ( !$providerSpec ) {
throw new InvalidArgumentException( "Invalid central ID provider $providerId" );
}
$provider = $this->objectFactory->createObject(
$providerSpec,
[ 'assertClass' => CentralIdLookup::class ]
);
$provider->init( $providerId, $this->userIdentityLookup, $this->userFactory );
$this->instanceCache[$providerId] = $provider;
}
return $this->instanceCache[$providerId];
}
/**
* Returns a CentralIdLookup that is guaranteed to be non-local.
* If no such guarantee can be made, returns null.
*
* If this function returns a non-null CentralIdLookup, that lookup is expected to provide IDs
* that are shared with some set of other wikis. However, you should still be cautious
* when using those IDs, as they will not necessarily work with *all* other wikis, and it can be
* hard to tell if another wiki is in the same set as this one or not.
*
* @param string|null $providerID Provider ID from $wgCentralIdLookupProviders or null
* to use the provider configured in $wgCentralIdLookupProvider
* @return ?CentralIdLookup
* @throws InvalidArgumentException if $providerId is not properly configured
*/
public function getNonLocalLookup( ?string $providerID = null ): ?CentralIdLookup {
$centralIdLookup = $this->getLookup( $providerID );
if ( $centralIdLookup instanceof LocalIdLookup ) {
/*
* A LocalIdLookup (which is the default) may actually be non-local,
* if shared user tables are used.
* However, we cannot know that here, so play it safe and refuse to return it.
* See also T163277 and T170996.
*/
return null;
}
return $centralIdLookup;
}
}

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