SpecialGlobalGroupMembership.php
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SpecialGlobalGroupMembership.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\Extension\CentralAuth\Special;

	use LogEventsList;
	use LogPage;
	use ManualLogEntry;
	use MediaWiki\CommentStore\CommentStore;
	use MediaWiki\Extension\CentralAuth\GlobalGroup\GlobalGroupLookup;
	use MediaWiki\Extension\CentralAuth\User\CentralAuthUser;
	use MediaWiki\Extension\CentralAuth\Widget\HTMLGlobalUserTextField;
	use MediaWiki\Html\Html;
	use MediaWiki\HTMLForm\HTMLForm;
	use MediaWiki\Linker\Linker;
	use MediaWiki\Output\OutputPage;
	use MediaWiki\SpecialPage\SpecialPage;
	use MediaWiki\Specials\SpecialUserRights;
	use MediaWiki\Status\Status;
	use MediaWiki\Title\TitleFactory;
	use MediaWiki\User\UserGroupMembership;
	use MediaWiki\User\UserNamePrefixSearch;
	use MediaWiki\User\UserNameUtils;
	use MediaWiki\Xml\Xml;
	use MediaWiki\Xml\XmlSelect;
	use PermissionsError;
	use UserBlockedError;

	/**
	* Equivalent of Special:Userrights for global groups.
	*
	* @ingroup Extensions
	*/
	class SpecialGlobalGroupMembership extends SpecialPage {

	/**
	* The target of the local right-adjuster's interest. Can be gotten from
	* either a GET parameter or a subpage-style parameter, so have a member
	* variable for it.
	* @var null\|string
	*/
	protected $mTarget;

	/**
	* @var null\|CentralAuthUser The user object of the target username or null.
	*/
	protected $mFetchedUser = null;

	private TitleFactory $titleFactory;
	private UserNamePrefixSearch $userNamePrefixSearch;
	private UserNameUtils $userNameUtils;
	private GlobalGroupLookup $globalGroupLookup;

	public function __construct(
	TitleFactory $titleFactory,
	UserNamePrefixSearch $userNamePrefixSearch,
	UserNameUtils $userNameUtils,
	GlobalGroupLookup $globalGroupLookup
	) {
	parent::__construct( 'GlobalGroupMembership' );
	$this->titleFactory = $titleFactory;
	$this->userNamePrefixSearch = $userNamePrefixSearch;
	$this->userNameUtils = $userNameUtils;
	$this->globalGroupLookup = $globalGroupLookup;
	}

	/**
	* @inheritDoc
	*/
	public function doesWrites() {
	return true;
	}

	/**
	* Manage forms to be shown according to posted data.
	* Depending on the submit button used, call a form or a save function.
	*
	* @param string\|null $par String if any subpage provided, else null
	* @throws UserBlockedError\|PermissionsError
	*/
	public function execute( $par ) {
	$user = $this->getUser();
	$request = $this->getRequest();
	$session = $request->getSession();
	$out = $this->getOutput();

	$out->addModules( [ 'mediawiki.special.userrights' ] );

	$this->mTarget = $par ?? $request->getVal( 'user' );

	$fetchedStatus = $this->mTarget === null ? Status::newFatal( 'nouserspecified' ) :
	$this->fetchUser( $this->mTarget );
	if ( $fetchedStatus->isOK() ) {
	$this->mFetchedUser = $fetchedStatus->value;
	}

	// show a successbox, if the user rights was saved successfully
	if (
	$session->get( 'specialUserrightsSaveSuccess' ) &&
	$this->mFetchedUser !== null
	) {
	// Remove session data for the success message
	$session->remove( 'specialUserrightsSaveSuccess' );

	$out->addModuleStyles( 'mediawiki.notification.convertmessagebox.styles' );
	$out->addHTML(
	Html::successBox(
	Html::element(
	'p',
	[],
	$this->msg( 'savedrights', $this->mFetchedUser->getName() )->text()
	),
	'mw-notify-success'
	)
	);
	}

	$this->setHeaders();
	$this->outputHeader();

	$out->addModuleStyles( 'mediawiki.special' );
	$this->addHelpLink( 'Help:Assigning permissions' );

	$this->switchForm();

	if (
	$request->wasPosted() &&
	$request->getCheck( 'saveusergroups' ) &&
	$this->mTarget !== null &&
	$user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
	) {
	/*
	* If the user is blocked and they only have "partial" access
	* (e.g. they don't have the userrights permission), then don't
	* allow them to change any user rights.
	*/
	if ( !$this->getAuthority()->isAllowed( 'userrights' ) ) {
	$block = $user->getBlock();
	if ( $block && $block->isSitewide() ) {
	throw new UserBlockedError(
	$block,
	$user,
	$this->getLanguage(),
	$request->getIP()
	);
	}
	}

	$this->checkReadOnly();

	// save settings
	if ( !$fetchedStatus->isOK() ) {
	$this->getOutput()->addWikiTextAsInterface(
	$fetchedStatus->getWikiText( false, false, $this->getLanguage() )
	);

	return;
	}

	$targetUser = $this->mFetchedUser;

	$conflictCheck = $request->getVal( 'conflictcheck-originalgroups' );
	$conflictCheck = ( $conflictCheck === '' ) ? [] : explode( ',', $conflictCheck );
	$userGroups = $targetUser->getGlobalGroups();

	if ( $userGroups !== $conflictCheck ) {
	$out->addHTML( Html::errorBox(
	$this->msg( 'userrights-conflict' )->parse()
	) );
	} else {
	$status = $this->saveUserGroups(
	$targetUser,
	$request->getVal( 'user-reason' )
	);

	if ( $status->isOK() ) {
	// Set session data for the success message
	$session->set( 'specialUserrightsSaveSuccess', 1 );

	$out->redirect( $this->getSuccessURL() );
	return;
	} else {
	// Print an error message and redisplay the form
	$out->wrapWikiTextAsInterface(
	'error', $status->getWikiText( false, false, $this->getLanguage() )
	);
	}
	}
	}

	// show some more forms
	if ( $this->mTarget !== null ) {
	$this->editUserGroupsForm( $this->mTarget );
	}
	}

	/**
	* @return string
	*/
	private function getSuccessURL() {
	return $this->getPageTitle( $this->mTarget )->getFullURL();
	}

	/**
	* Save user groups changes in the database.
	* Data comes from the editUserGroupsForm() form function
	*
	* @param CentralAuthUser $user Target user object.
	* @param string $reason Reason for group change
	* @return Status
	*/
	private function saveUserGroups( CentralAuthUser $user, string $reason ): Status {
	$allgroups = $this->globalGroupLookup->getDefinedGroups();
	$addgroup = [];
	// associative array of (group name => expiry)
	$groupExpiries = [];
	$removegroup = [];
	$existingGroups = $user->getGlobalGroupsWithExpiration();

	// This could possibly create a highly unlikely race condition if permissions are changed between
	// when the form is loaded and when the form is saved. Ignoring it for the moment.
	foreach ( $allgroups as $group ) {
	// We'll tell it to remove all unchecked groups, and add all checked groups.
	// Later on, this gets filtered for what can actually be removed
	if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
	$addgroup[] = $group;

	// read the expiry information from the request
	$expiryDropdown = $this->getRequest()->getVal( "wpExpiry-$group" );
	if ( $expiryDropdown === 'existing' ) {
	continue;
	}

	if ( $expiryDropdown === 'other' ) {
	$expiryValue = $this->getRequest()->getVal( "wpExpiry-$group-other" );
	} else {
	$expiryValue = $expiryDropdown;
	}

	// validate the expiry
	$groupExpiries[$group] = SpecialUserRights::expiryToTimestamp( $expiryValue );

	if ( $groupExpiries[$group] === false ) {
	return Status::newFatal( 'userrights-invalid-expiry', $group );
	}

	// not allowed to have things expiring in the past
	if ( $groupExpiries[$group] && $groupExpiries[$group] < wfTimestampNow() ) {
	return Status::newFatal( 'userrights-expiry-in-past', $group );
	}
	} else {
	$removegroup[] = $group;
	}
	}

	$this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason, [], $groupExpiries );

	return Status::newGood();
	}

	/**
	* Save user groups changes in the database. This function does not throw errors;
	* instead, it ignores groups that the performer does not have permission to set.
	*
	* @param CentralAuthUser $user
	* @param string[] $add Array of groups to add
	* @param string[] $remove Array of groups to remove
	* @param string $reason Reason for group change
	* @param string[] $tags Array of change tags to add to the log entry
	* @param array<string,?string> $groupExpiries Associative array of (group name => expiry),
	* containing only those groups that are to have new expiry values set
	* @return array Tuple of added, then removed groups
	*/
	public function doSaveUserGroups(
	CentralAuthUser $user,
	array $add,
	array $remove,
	string $reason = '',
	array $tags = [],
	array $groupExpiries = []
	) {
	// Validate input set...
	$groups = $user->getGlobalGroupsWithExpiration();
	$changeable = $this->changeableGroups();

	$remove = array_unique( array_intersect( $remove, $changeable, array_keys( $groups ) ) );
	$add = array_intersect( $add, $changeable );

	// add only groups that are not already present or that need their expiry updated
	$add = array_filter( $add,
	static function ( $group ) use ( $groups, $groupExpiries ) {
	return !array_key_exists( $group, $groups ) \|\| array_key_exists( $group, $groupExpiries );
	} );

	// Remove groups, then add new ones/update expiries of existing ones
	if ( $remove ) {
	foreach ( $remove as $group ) {
	$user->removeFromGlobalGroups( $group );
	}
	}
	if ( $add ) {
	foreach ( $add as $group ) {
	$expiry = $groupExpiries[$group] ?? null;
	$user->addToGlobalGroup( $group, $expiry );
	}
	}

	$newGroups = $user->getGlobalGroupsWithExpiration();

	// Ensure that caches are cleared
	$user->invalidateCache();

	// Only add a log entry if something actually changed
	if ( $groups !== $newGroups ) {
	$this->addLogEntry(
	$user,
	$groups,
	$newGroups,
	$reason,
	$tags
	);
	}

	return [ $add, $remove ];
	}

	/**
	* @param CentralAuthUser $user
	* @param array $oldGroups
	* @param array $newGroups
	* @param string $reason
	* @param array $tags Not currently used
	*/
	private function addLogEntry(
	CentralAuthUser $user,
	array $oldGroups,
	array $newGroups,
	string $reason,
	array $tags
	) {
	$oldGroupNames = [];
	$newGroupNames = [];
	$oldGroupMetadata = [];
	$newGroupMetadata = [];

	foreach ( $oldGroups as $key => &$value ) {
	$oldGroupNames[] = $key;
	$oldGroupMetadata[] = [ 'expiry' => $value ];
	}

	foreach ( $newGroups as $key => &$value ) {
	$newGroupNames[] = $key;
	$newGroupMetadata[] = [ 'expiry' => $value ];
	}

	$entry = new ManualLogEntry( 'gblrights', 'usergroups' );
	$entry->setTarget( $this->titleFactory->makeTitle( NS_USER, $user->getName() ) );
	$entry->setPerformer( $this->getUser() );
	$entry->setComment( $reason );
	$entry->setParameters( [
	'oldGroups' => $oldGroupNames,
	'newGroups' => $newGroupNames,
	'oldMetadata' => $oldGroupMetadata,
	'newMetadata' => $newGroupMetadata,
	] );
	$logid = $entry->insert();
	$entry->publish( $logid );
	}

	/**
	* Edit user groups membership
	* @param string $username Name of the user.
	*/
	private function editUserGroupsForm( $username ) {
	$status = $this->fetchUser( $username );
	if ( !$status->isOK() ) {
	$this->getOutput()->addWikiTextAsInterface(
	$status->getWikiText( false, false, $this->getLanguage() )
	);

	return;
	}

	/** @var CentralAuthUser $user */
	$user = $status->value;
	'@phan-var CentralAuthUser $user';

	$this->showEditUserGroupsForm( $user );

	// This isn't really ideal logging behavior, but let's not hide the
	// interwiki logs if we're using them as is.
	$this->showLogFragment( $user, $this->getOutput() );
	}

	/**
	* @param string $username
	* @return Status
	*/
	public function fetchUser( $username ) {
	if ( $username === '' ) {
	return Status::newFatal( 'nouserspecified' );
	}

	if ( $username[0] == '#' ) {
	$id = intval( substr( $username, 1 ) );
	$globalUser = CentralAuthUser::newPrimaryInstanceFromId( $id );
	// If the user exists, but is hidden from the viewer, pretend that it does
	// not exist. - T285190/T260863
	if (
	!$globalUser
	\|\| (
	( $globalUser->isSuppressed() \|\| $globalUser->isHidden() )
	&& !$this->getContext()->getAuthority()->isAllowed( 'centralauth-suppress' )
	)
	) {
	return Status::newFatal( 'noname', $id );
	}
	} else {
	// fetchUser() is public; normalize in case the caller forgot to. See T343963 and
	// T344495.
	$username = $this->userNameUtils->getCanonical( $username );
	if ( !is_string( $username ) ) {
	// $username was invalid, return nosuchuser.
	return Status::newFatal( 'nosuchusershort', $username );
	}

	// If the user exists, but is hidden from the viewer, pretend that it does
	// not exist. - T285190
	$globalUser = CentralAuthUser::getPrimaryInstanceByName( $username );
	if (
	!$globalUser->exists()
	\|\| (
	( $globalUser->isSuppressed() \|\| $globalUser->isHidden() )
	&& !$this->getContext()->getAuthority()->isAllowed( 'centralauth-suppress' )
	)
	) {
	return Status::newFatal( 'nosuchusershort', $username );
	}
	}

	return Status::newGood( $globalUser );
	}

	/**
	* Output a form to allow searching for a user
	*/
	private function switchForm() {
	$this->addHelpLink( 'Extension:CentralAuth' );
	$this->getOutput()->addModuleStyles( 'mediawiki.special' );
	$formDescriptor = [
	'user' => [
	'class' => HTMLGlobalUserTextField::class,
	'name' => 'user',
	'id' => 'username',
	'label-message' => 'userrights-user-editname',
	'size' => 30,
	'default' => $this->mTarget,
	]
	];

	$htmlForm = HTMLForm::factory( 'ooui', $formDescriptor, $this->getContext() );
	$htmlForm
	->setMethod( 'get' )
	// Strip subpage
	->setTitle( $this->getPageTitle() )
	->setAction( $this->getConfig()->get( 'Script' ) )
	->setId( 'mw-userrights-form1' )
	->setName( 'uluser' )
	->setSubmitTextMsg( 'editusergroup' )
	->setWrapperLegendMsg( 'userrights-lookup-user' )
	->prepareForm()
	->displayForm( false );
	}

	/**
	* Show the form to edit group memberships.
	* @param CentralAuthUser $user user you're editing
	*/
	private function showEditUserGroupsForm( CentralAuthUser $user ) {
	$list = $membersList = $tempList = $tempMembersList = [];
	foreach ( $user->getGlobalGroupsWithExpiration() as $group => $expiration ) {
	$ugm = new UserGroupMembership( $user->getId(), $group, $expiration );
	$linkG = UserGroupMembership::getLinkHTML( $ugm, $this->getContext() );
	$linkM = UserGroupMembership::getLinkHTML( $ugm, $this->getContext(), $user->getName() );
	if ( $ugm->getExpiry() ) {
	$tempList[] = $linkG;
	$tempMembersList[] = $linkM;
	} else {
	$list[] = $linkG;
	$membersList[] = $linkM;
	}
	}

	$language = $this->getLanguage();
	$displayedList = $this->msg( 'userrights-groupsmember-type' )
	->rawParams(
	$language->commaList( array_merge( $tempList, $list ) ),
	$language->commaList( array_merge( $tempMembersList, $membersList ) )
	)->escaped();

	$grouplist = '';
	$count = count( $list ) + count( $tempList );
	if ( $count > 0 ) {
	$grouplist = $this->msg( 'userrights-groupsmember' )
	->numParams( $count )
	->params( $user->getName() )
	->parse();
	$grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
	}

	$userToolLinks = Linker::userToolLinks(
	$user->getId(),
	$user->getName(),
	// default for redContribsWhenNoEdits
	false,
	Linker::TOOL_LINKS_EMAIL
	);

	$canChangeAny = $this->changeableGroups() !== [];
	$this->getOutput()->addHTML(
	Xml::openElement(
	'form',
	[
	'method' => 'post',
	'action' => $this->getPageTitle()->getLocalURL(),
	'name' => 'editGroup',
	'id' => 'mw-userrights-form2'
	]
	) .
	Html::hidden( 'user', $this->mTarget ) .
	Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
	// Conflict detection
	Html::hidden(
	'conflictcheck-originalgroups',
	implode( ',', $user->getGlobalGroups() )
	) .
	Xml::openElement( 'fieldset' ) .
	Xml::element(
	'legend',
	[],
	$this->msg(
	$canChangeAny ? 'userrights-editusergroup' : 'userrights-viewusergroup',
	$user->getName()
	)->text()
	) .
	$this->msg(
	$canChangeAny ? 'editinguser' : 'viewinguserrights'
	)->params( wfEscapeWikiText( $user->getName() ) )
	->rawParams( $userToolLinks )->parse()
	);
	if ( $canChangeAny ) {
	$this->getOutput()->addHTML(
	$this->msg( 'userrights-groups-help', $user->getName() )->parse() .
	$grouplist .
	$this->groupCheckboxes( $user ) .
	Xml::openElement( 'table', [ 'id' => 'mw-userrights-table-outer' ] ) .
	"<tr>
	<td class='mw-label'>" .
	Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
	"</td>
	<td class='mw-input'>" .
	Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason' ) ?? false, [
	'id' => 'wpReason',
	// HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
	// (e.g. emojis) count for two each. This limit is overridden in JS to instead count
	// Unicode codepoints.
	'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT,
	] ) .
	"</td>
	</tr>
	<tr>
	<td></td>
	<td class='mw-submit'>" .
	Xml::submitButton( $this->msg( 'saveusergroups', $user->getName() )->text(),
	[ 'name' => 'saveusergroups' ] +
	Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
	) .
	"</td>
	</tr>" .
	Xml::closeElement( 'table' ) . "\n"
	);
	} else {
	$this->getOutput()->addHTML( $grouplist );
	}
	$this->getOutput()->addHTML(
	Xml::closeElement( 'fieldset' ) .
	Xml::closeElement( 'form' ) . "\n"
	);
	}

	/**
	* Adds a table with checkboxes where you can select what groups to add/remove.
	*
	* This is only called when the user can change any of the groups.
	*
	* @param CentralAuthUser $user
	* @return string The HTML table element with checkboxes and expiry dropdowns
	*/
	private function groupCheckboxes( CentralAuthUser $user ) {
	$allgroups = $this->globalGroupLookup->getDefinedGroups();
	$currentGroups = $user->getGlobalGroupsWithExpiration();
	$ret = '';

	// Get the list of preset expiry times from the system message
	$expiryOptionsMsg = $this->msg( 'userrights-expiry-options' )->inContentLanguage();
	$expiryOptions = $expiryOptionsMsg->isDisabled()
	? []
	: XmlSelect::parseOptionsMessage( $expiryOptionsMsg->text() );

	// Build the HTML table
	$ret .= Xml::openElement( 'table', [ 'class' => 'mw-userrights-groups' ] ) .
	"<tr>\n";
	$ret .= Xml::element(
	'th',
	null,
	$this->msg( 'userrights-changeable-col', count( $allgroups ) )->text()
	);

	$ret .= "</tr>\n<tr>\n";
	$uiLanguage = $this->getLanguage();

	$ret .= "\t<td style='vertical-align:top;'>\n";
	foreach ( $allgroups as $group ) {
	$set = array_key_exists( $group, $currentGroups );

	$member = $uiLanguage->getGroupMemberName( $group, $user->getName() );
	$id = "wpGroup-$group";
	$checkboxHtml = Html::element( 'input', [
	'class' => 'mw-userrights-groupcheckbox',
	'type' => 'checkbox', 'value' => '1', 'checked' => $set,
	'id' => $id, 'name' => $id,
	] ) . ' ' . Html::label( $member, $id );

	$uiUser = $this->getUser();

	$currentExpiry = $currentGroups[$group] ?? null;

	$expiryHtml = Xml::element( 'span', null,
	$this->msg( 'userrights-expiry' )->text() );
	$expiryHtml .= Xml::openElement( 'span' );

	// add a form element to set the expiry date
	$expiryFormOptions = new XmlSelect(
	"wpExpiry-$group",
	// forward compatibility with HTMLForm
	"mw-input-wpExpiry-$group",
	$currentExpiry ? 'existing' : 'infinite'
	);

	if ( $currentExpiry ) {
	$timestamp = $uiLanguage->userTimeAndDate( $currentExpiry, $uiUser );
	$d = $uiLanguage->userDate( $currentExpiry, $uiUser );
	$t = $uiLanguage->userTime( $currentExpiry, $uiUser );
	$existingExpiryMessage = $this->msg( 'userrights-expiry-existing',
	$timestamp, $d, $t );
	$expiryFormOptions->addOption( $existingExpiryMessage->text(), 'existing' );
	}

	$expiryFormOptions->addOption(
	$this->msg( 'userrights-expiry-none' )->text(),
	'infinite'
	);
	$expiryFormOptions->addOption(
	$this->msg( 'userrights-expiry-othertime' )->text(),
	'other'
	);

	$expiryFormOptions->addOptions( $expiryOptions );

	// Add expiry dropdown
	$expiryHtml .= $expiryFormOptions->getHTML() . '<br />';

	// Add custom expiry field
	$attribs = [
	'id' => "mw-input-wpExpiry-$group-other",
	'class' => 'mw-userrights-expiryfield',
	];
	$expiryHtml .= Xml::input( "wpExpiry-$group-other", 30, '', $attribs );

	$expiryHtml .= Xml::closeElement( 'span' );

	$divAttribs = [
	'id' => "mw-userrights-nested-wpGroup-$group",
	'class' => 'mw-userrights-nested',
	];
	$checkboxHtml .= "\t\t\t" . Xml::tags( 'div', $divAttribs, $expiryHtml ) . "\n";

	$ret .= "\t\t" . Xml::tags( 'div', [], $checkboxHtml
	) . "\n";
	}
	$ret .= "\t</td>\n";

	$ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );

	return $ret;
	}

	/**
	* @return string[]
	*/
	private function changeableGroups() {
	if ( $this->getContext()->getAuthority()->isAllowed( 'globalgroupmembership' ) ) {
	return $this->globalGroupLookup->getDefinedGroups();
	}
	return [];
	}

	/**
	* @param CentralAuthUser $user
	* @param OutputPage $output
	*/
	private function showLogFragment( $user, $output ) {
	$logPage = new LogPage( 'gblrights' );
	$output->addHTML( Xml::element( 'h2', null, $logPage->getName()->text() . "\n" ) );
	LogEventsList::showLogExtract(
	$output,
	'gblrights',
	$this->titleFactory->makeTitle( NS_USER, $user->getName() )
	);
	}

	/**
	* Return an array of subpages beginning with $search that this special page will accept.
	*
	* @param string $search Prefix to search for
	* @param int $limit Maximum number of results to return (usually 10)
	* @param int $offset Number of results to skip (usually 0)
	* @return string[] Matching subpages
	*/
	public function prefixSearchSubpages( $search, $limit, $offset ) {
	$search = $this->userNameUtils->getCanonical( $search );
	if ( !$search ) {
	// No prefix suggestion for invalid user
	return [];
	}
	// Autocomplete subpage as user list - public to allow caching
	return $this->userNamePrefixSearch
	->search( UserNamePrefixSearch::AUDIENCE_PUBLIC, $search, $limit, $offset );
	}

	/**
	* @inheritDoc
	*/
	protected function getGroupName() {
	return 'users';
	}
	}

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