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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;
use InvalidArgumentException;
use MediaWiki\Exception\CannotCreateActorException;
use stdClass;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IReadableDatabase;
/**
* Service for dealing with the actor table.
* @since 1.36
*/
interface ActorNormalization {
/**
* Instantiate a new UserIdentity object based on a $row from the actor table.
*
* Use this method when an actor row was already fetched from the DB via a join.
* This method just constructs a new instance and does not try fetching missing
* values from the DB again, use {@link UserIdentityLookup} for that.
*
* @param stdClass $row with the following fields:
* - int actor_id
* - string actor_name
* - int|null actor_user
* @return UserIdentity
* @throws InvalidArgumentException
*/
public function newActorFromRow( stdClass $row ): UserIdentity;
/**
* Instantiate a new UserIdentity object based on field values from a DB row.
*
* Until {@link ActorMigration} is completed, the actor table joins alias actor field names
* to legacy field names. This method is convenience to construct the UserIdentity based on
* legacy field names. It's more relaxed with typing then ::newFromRow to better support legacy
* code, so always prefer ::newFromRow in new code. Eventually, once {@link ActorMigration}
* is completed and all queries use explicit join with actor table, this method will be
* deprecated and removed.
*
* @throws InvalidArgumentException
* @param int|null $userId
* @param string|null $name
* @param int|null $actorId
* @return UserIdentity
*/
public function newActorFromRowFields( $userId, $name, $actorId ): UserIdentity;
/**
* Find the actor_id for the given name.
*
* @param string $name
* @param IReadableDatabase $db The database connection to operate on.
* The database must correspond to the wiki this ActorNormalization is bound to.
* @return int|null
*/
public function findActorIdByName( string $name, IReadableDatabase $db ): ?int;
/**
* Find the actor_id of the given $user.
*
* @param UserIdentity $user
* @param IReadableDatabase $db The database connection to operate on.
* The database must correspond to the wiki this ActorNormalization is bound to.
* @return int|null
*/
public function findActorId( UserIdentity $user, IReadableDatabase $db ): ?int;
/**
* Attempt to assign an actor ID to the given $user
* If it is already assigned, return the existing ID.
*
* @param UserIdentity $user
* @param IDatabase $dbw The database connection to acquire the ID from.
* The database must correspond to the wiki this ActorNormalization is bound to.
* @return int greater then 0
* @throws CannotCreateActorException if no actor ID has been assigned to this $user
*/
public function acquireActorId( UserIdentity $user, IDatabase $dbw ): int;
/**
* Find an actor by $id.
*
* @param int $actorId
* @param IReadableDatabase $db The database connection to operate on.
* The database must correspond to the wiki this ActorNormalization is bound to.
* @return UserIdentity|null Returns null if no actor with this $actorId exists in the database.
*/
public function getActorById( int $actorId, IReadableDatabase $db ): ?UserIdentity;
/**
* In case all reasonable attempts of initializing a proper actor from the
* database have failed, entities can be attributed to special 'Unknown user' actor.
*
* @return UserIdentity
*/
public function getUnknownActor(): UserIdentity;
}
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