Current File : //proc/thread-self/root/www/varak.net/wiki.varak.net/includes/user/UserGroupMembership.php
<?php
/**
* Represents the membership of a user to a user group.
*
* 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
*/
use Wikimedia\Rdbms\IDatabase;
use MediaWiki\MediaWikiServices;
/**
* Represents a "user group membership" -- a specific instance of a user belonging
* to a group. For example, the fact that user Mary belongs to the sysop group is a
* user group membership.
*
* The class encapsulates rows in the user_groups table. The logic is low-level and
* doesn't run any hooks. Often, you will want to call User::addGroup() or
* User::removeGroup() instead.
*
* @since 1.29
*/
class UserGroupMembership {
/** @var int The ID of the user who belongs to the group */
private $userId;
/** @var string */
private $group;
/** @var string|null Timestamp of expiry in TS_MW format, or null if no expiry */
private $expiry;
/**
* @param int $userId The ID of the user who belongs to the group
* @param string|null $group The internal group name
* @param string|null $expiry Timestamp of expiry in TS_MW format, or null if no expiry
*/
public function __construct( $userId = 0, $group = null, $expiry = null ) {
$this->userId = (int)$userId;
$this->group = $group; // TODO throw on invalid group?
$this->expiry = $expiry ?: null;
}
/**
* @return int
*/
public function getUserId() {
return $this->userId;
}
/**
* @return string
*/
public function getGroup() {
return $this->group;
}
/**
* @return string|null Timestamp of expiry in TS_MW format, or null if no expiry
*/
public function getExpiry() {
return $this->expiry;
}
protected function initFromRow( $row ) {
$this->userId = (int)$row->ug_user;
$this->group = $row->ug_group;
$this->expiry = $row->ug_expiry === null ?
null :
wfTimestamp( TS_MW, $row->ug_expiry );
}
/**
* Creates a new UserGroupMembership object from a database row.
*
* @param stdClass $row The row from the user_groups table
* @return UserGroupMembership
*/
public static function newFromRow( $row ) {
$ugm = new self;
$ugm->initFromRow( $row );
return $ugm;
}
/**
* Returns the list of user_groups fields that should be selected to create
* a new user group membership.
* @return array
*/
public static function selectFields() {
return [
'ug_user',
'ug_group',
'ug_expiry',
];
}
/**
* Delete the row from the user_groups table.
*
* @throws MWException
* @param IDatabase|null $dbw Optional master database connection to use
* @return bool Whether or not anything was deleted
*/
public function delete( IDatabase $dbw = null ) {
if ( wfReadOnly() ) {
return false;
}
if ( $dbw === null ) {
$dbw = wfGetDB( DB_MASTER );
}
$dbw->delete(
'user_groups',
[ 'ug_user' => $this->userId, 'ug_group' => $this->group ],
__METHOD__ );
if ( !$dbw->affectedRows() ) {
return false;
}
// Remember that the user was in this group
$dbw->insert(
'user_former_groups',
[ 'ufg_user' => $this->userId, 'ufg_group' => $this->group ],
__METHOD__,
[ 'IGNORE' ] );
return true;
}
/**
* Insert a user right membership into the database. When $allowUpdate is false,
* the function fails if there is a conflicting membership entry (same user and
* group) already in the table.
*
* @throws MWException
* @param bool $allowUpdate Whether to perform "upsert" instead of INSERT
* @param IDatabase|null $dbw If you have one available
* @return bool Whether or not anything was inserted
*/
public function insert( $allowUpdate = false, IDatabase $dbw = null ) {
if ( $dbw === null ) {
$dbw = wfGetDB( DB_MASTER );
}
// Purge old, expired memberships from the DB
JobQueueGroup::singleton()->push( new UserGroupExpiryJob() );
// Check that the values make sense
if ( $this->group === null ) {
throw new UnexpectedValueException(
'Don\'t try inserting an uninitialized UserGroupMembership object' );
} elseif ( $this->userId <= 0 ) {
throw new UnexpectedValueException(
'UserGroupMembership::insert() needs a positive user ID. ' .
'Did you forget to add your User object to the database before calling addGroup()?' );
}
$row = $this->getDatabaseArray( $dbw );
$dbw->insert( 'user_groups', $row, __METHOD__, [ 'IGNORE' ] );
$affected = $dbw->affectedRows();
// Don't collide with expired user group memberships
// Do this after trying to insert, in order to avoid locking
if ( !$affected ) {
$conds = [
'ug_user' => $row['ug_user'],
'ug_group' => $row['ug_group'],
];
// if we're unconditionally updating, check that the expiry is not already the
// same as what we are trying to update it to; otherwise, only update if
// the expiry date is in the past
if ( $allowUpdate ) {
if ( $this->expiry ) {
$conds[] = 'ug_expiry IS NULL OR ug_expiry != ' .
$dbw->addQuotes( $dbw->timestamp( $this->expiry ) );
} else {
$conds[] = 'ug_expiry IS NOT NULL';
}
} else {
$conds[] = 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp() );
}
$row = $dbw->selectRow( 'user_groups', $this::selectFields(), $conds, __METHOD__ );
if ( $row ) {
$dbw->update(
'user_groups',
[ 'ug_expiry' => $this->expiry ? $dbw->timestamp( $this->expiry ) : null ],
[ 'ug_user' => $row->ug_user, 'ug_group' => $row->ug_group ],
__METHOD__ );
$affected = $dbw->affectedRows();
}
}
return $affected > 0;
}
/**
* Get an array suitable for passing to $dbw->insert() or $dbw->update()
* @param IDatabase $db
* @return array
*/
protected function getDatabaseArray( IDatabase $db ) {
return [
'ug_user' => $this->userId,
'ug_group' => $this->group,
'ug_expiry' => $this->expiry ? $db->timestamp( $this->expiry ) : null,
];
}
/**
* Has the membership expired?
* @return bool
*/
public function isExpired() {
if ( !$this->expiry ) {
return false;
}
return wfTimestampNow() > $this->expiry;
}
/**
* Purge expired memberships from the user_groups table
*
* @return int|bool false if purging wasn't attempted (e.g. because of
* readonly), the number of rows purged (might be 0) otherwise
*/
public static function purgeExpired() {
$services = MediaWikiServices::getInstance();
if ( $services->getReadOnlyMode()->isReadOnly() ) {
return false;
}
$lbFactory = $services->getDBLoadBalancerFactory();
$ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ );
$dbw = $services->getDBLoadBalancer()->getConnection( DB_MASTER );
$lockKey = $dbw->getDomainID() . ':usergroups-prune'; // specific to this wiki
$scopedLock = $dbw->getScopedLockAndFlush( $lockKey, __METHOD__, 0 );
if ( !$scopedLock ) {
return false; // already running
}
$now = time();
$purgedRows = 0;
do {
$dbw->startAtomic( __METHOD__ );
$res = $dbw->select(
'user_groups',
self::selectFields(),
[ 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp( $now ) ) ],
__METHOD__,
[ 'FOR UPDATE', 'LIMIT' => 100 ]
);
if ( $res->numRows() > 0 ) {
$insertData = []; // array of users/groups to insert to user_former_groups
$deleteCond = []; // array for deleting the rows that are to be moved around
foreach ( $res as $row ) {
$insertData[] = [ 'ufg_user' => $row->ug_user, 'ufg_group' => $row->ug_group ];
$deleteCond[] = $dbw->makeList(
[ 'ug_user' => $row->ug_user, 'ug_group' => $row->ug_group ],
$dbw::LIST_AND
);
}
// Delete the rows we're about to move
$dbw->delete(
'user_groups',
$dbw->makeList( $deleteCond, $dbw::LIST_OR ),
__METHOD__
);
// Push the groups to user_former_groups
$dbw->insert( 'user_former_groups', $insertData, __METHOD__, [ 'IGNORE' ] );
// Count how many rows were purged
$purgedRows += $res->numRows();
}
$dbw->endAtomic( __METHOD__ );
$lbFactory->commitAndWaitForReplication( __METHOD__, $ticket );
} while ( $res->numRows() > 0 );
return $purgedRows;
}
/**
* Returns UserGroupMembership objects for all the groups a user currently
* belongs to.
*
* @param int $userId ID of the user to search for
* @param IDatabase|null $db Optional database connection
* @return UserGroupMembership[] Associative array of (group name => UserGroupMembership object)
*/
public static function getMembershipsForUser( $userId, IDatabase $db = null ) {
if ( !$db ) {
$db = wfGetDB( DB_REPLICA );
}
$res = $db->select( 'user_groups',
self::selectFields(),
[ 'ug_user' => $userId ],
__METHOD__ );
$ugms = [];
foreach ( $res as $row ) {
$ugm = self::newFromRow( $row );
if ( !$ugm->isExpired() ) {
$ugms[$ugm->group] = $ugm;
}
}
return $ugms;
}
/**
* Returns a UserGroupMembership object that pertains to the given user and group,
* or false if the user does not belong to that group (or the assignment has
* expired).
*
* @param int $userId ID of the user to search for
* @param string $group User group name
* @param IDatabase|null $db Optional database connection
* @return UserGroupMembership|false
*/
public static function getMembership( $userId, $group, IDatabase $db = null ) {
if ( !$db ) {
$db = wfGetDB( DB_REPLICA );
}
$row = $db->selectRow( 'user_groups',
self::selectFields(),
[ 'ug_user' => $userId, 'ug_group' => $group ],
__METHOD__ );
if ( !$row ) {
return false;
}
$ugm = self::newFromRow( $row );
if ( !$ugm->isExpired() ) {
return $ugm;
}
return false;
}
/**
* Gets a link for a user group, possibly including the expiry date if relevant.
*
* @param string|UserGroupMembership $ugm Either a group name as a string, or
* a UserGroupMembership object
* @param IContextSource $context
* @param string $format Either 'wiki' or 'html'
* @param string|null $userName If you want to use the group member message
* ("administrator"), pass the name of the user who belongs to the group; it
* is used for GENDER of the group member message. If you instead want the
* group name message ("Administrators"), omit this parameter.
* @return string
*/
public static function getLink( $ugm, IContextSource $context, $format,
$userName = null
) {
if ( $format !== 'wiki' && $format !== 'html' ) {
throw new MWException( 'UserGroupMembership::getLink() $format parameter should be ' .
"'wiki' or 'html'" );
}
if ( $ugm instanceof UserGroupMembership ) {
$expiry = $ugm->getExpiry();
$group = $ugm->getGroup();
} else {
$expiry = null;
$group = $ugm;
}
if ( $userName !== null ) {
$groupName = self::getGroupMemberName( $group, $userName );
} else {
$groupName = self::getGroupName( $group );
}
// link to the group description page, if it exists
$linkTitle = self::getGroupPage( $group );
if ( $linkTitle ) {
if ( $format === 'wiki' ) {
$linkPage = $linkTitle->getFullText();
$groupLink = "[[$linkPage|$groupName]]";
} else {
$groupLink = Linker::link( $linkTitle, htmlspecialchars( $groupName ) );
}
} else {
$groupLink = htmlspecialchars( $groupName );
}
if ( $expiry ) {
// format the expiry to a nice string
$uiLanguage = $context->getLanguage();
$uiUser = $context->getUser();
$expiryDT = $uiLanguage->userTimeAndDate( $expiry, $uiUser );
$expiryD = $uiLanguage->userDate( $expiry, $uiUser );
$expiryT = $uiLanguage->userTime( $expiry, $uiUser );
if ( $format === 'html' ) {
$groupLink = Message::rawParam( $groupLink );
}
return $context->msg( 'group-membership-link-with-expiry' )
->params( $groupLink, $expiryDT, $expiryD, $expiryT )->text();
}
return $groupLink;
}
/**
* Gets the localized friendly name for a group, if it exists. For example,
* "Administrators" or "Bureaucrats"
*
* @param string $group Internal group name
* @return string Localized friendly group name
*/
public static function getGroupName( $group ) {
$msg = wfMessage( "group-$group" );
return $msg->isBlank() ? $group : $msg->text();
}
/**
* Gets the localized name for a member of a group, if it exists. For example,
* "administrator" or "bureaucrat"
*
* @param string $group Internal group name
* @param string $username Username for gender
* @return string Localized name for group member
*/
public static function getGroupMemberName( $group, $username ) {
$msg = wfMessage( "group-$group-member", $username );
return $msg->isBlank() ? $group : $msg->text();
}
/**
* Gets the title of a page describing a particular user group. When the name
* of the group appears in the UI, it can link to this page.
*
* @param string $group Internal group name
* @return Title|bool Title of the page if it exists, false otherwise
*/
public static function getGroupPage( $group ) {
$msg = wfMessage( "grouppage-$group" )->inContentLanguage();
if ( $msg->exists() ) {
$title = Title::newFromText( $msg->text() );
if ( is_object( $title ) ) {
return $title;
}
}
return false;
}
}
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