SpecialUserrights.php

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<?php
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\User\UserFactory;
use MediaWiki\User\UserGroupManager;
use MediaWiki\User\UserGroupManagerFactory;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserNamePrefixSearch;
use MediaWiki\User\UserNameUtils;
 
class UserrightsPage extends SpecialPage {
    protected $mTarget;
    protected $mFetchedUser = null;
    protected $isself = false;
 
    private $userGroupManager;
 
    private $userNameUtils;
 
    private $userNamePrefixSearch;
 
    private $userFactory;
 
    public function __construct(
        UserGroupManagerFactory $userGroupManagerFactory = null,
        UserNameUtils $userNameUtils = null,
        UserNamePrefixSearch $userNamePrefixSearch = null,
        UserFactory $userFactory = null
    ) {
        parent::__construct( 'Userrights' );
        $services = MediaWikiServices::getInstance();
        // This class is extended and therefore falls back to global state - T263207
        $this->userNameUtils = $userNameUtils ?? $services->getUserNameUtils();
        $this->userNamePrefixSearch = $userNamePrefixSearch ?? $services->getUserNamePrefixSearch();
        $this->userFactory = $userFactory ?? $services->getUserFactory();
 
        // TODO don't hard code false, use interwiki domains. See T14518
        $this->userGroupManager = ( $userGroupManagerFactory ?? $services->getUserGroupManagerFactory() )
            ->getUserGroupManager( false );
    }
 
    public function doesWrites() {
        return true;
    }
 
    public function userCanChangeRights( UserIdentity $targetUser, $checkIfSelf = true ) {
        $isself = $this->getUser()->equals( $targetUser );
 
        $available = $this->changeableGroups();
        if ( $targetUser->getId() === 0 ) {
            return false;
        }
 
        if ( $available['add'] || $available['remove'] ) {
            // can change some rights for any user
            return true;
        }
 
        if ( ( $available['add-self'] || $available['remove-self'] )
            && ( $isself || !$checkIfSelf )
        ) {
            // can change some rights for self
            return true;
        }
 
        return false;
    }
 
    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' );
 
        if ( is_string( $this->mTarget ) ) {
            $this->mTarget = trim( $this->mTarget );
        }
 
        if ( $this->mTarget !== null && $this->userNameUtils->getCanonical( $this->mTarget ) === $user->getName() ) {
            $this->isself = true;
        }
 
        $fetchedStatus = $this->mTarget === null ? Status::newFatal( 'nouserspecified' ) :
            $this->fetchUser( $this->mTarget, true );
        if ( $fetchedStatus->isOK() ) {
            $this->mFetchedUser = $fetchedStatus->value;
            if ( $this->mFetchedUser instanceof User ) {
                // Set the 'relevant user' in the skin, so it displays links like Contributions,
                // User logs, UserRights, etc.
                $this->getSkin()->setRelevantUser( $this->mFetchedUser );
            }
        }
 
        // 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;
            if ( $targetUser instanceof User ) { // UserRightsProxy doesn't have this method (T63252)
                $targetUser->clearInstanceCache(); // T40989
            }
 
            $conflictCheck = $request->getVal( 'conflictcheck-originalgroups' );
            $conflictCheck = ( $conflictCheck === '' ) ? [] : explode( ',', $conflictCheck );
            $userGroups = $targetUser->getGroups();
 
            if ( $userGroups !== $conflictCheck ) {
                $out->addHTML( Html::errorBox(
                    $this->msg( 'userrights-conflict' )->parse()
                ) );
            } else {
                $status = $this->saveUserGroups(
                    $this->mTarget,
                    $request->getVal( 'user-reason' ),
                    $targetUser
                );
 
                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 );
        }
    }
 
    private function getSuccessURL() {
        return $this->getPageTitle( $this->mTarget )->getFullURL();
    }
 
    public function canProcessExpiries() {
        return true;
    }
 
    public static function expiryToTimestamp( $expiry ) {
        if ( wfIsInfinity( $expiry ) ) {
            return null;
        }
 
        $unix = strtotime( $expiry );
 
        if ( !$unix || $unix === -1 ) {
            return false;
        }
 
        // @todo FIXME: Non-qualified absolute times are not in users specified timezone
        // and there isn't notice about it in the ui (see ProtectionForm::getExpiry)
        return wfTimestamp( TS_MW, $unix );
    }
 
    protected function saveUserGroups( $username, $reason, $user ) {
        $allgroups = $this->getAllGroups();
        $addgroup = [];
        $groupExpiries = []; // associative array of (group name => expiry)
        $removegroup = [];
        $existingUGMs = $user->getGroupMemberships();
 
        // 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;
 
                if ( $this->canProcessExpiries() ) {
                    // 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] = self::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 );
                    }
 
                    // if the user can only add this group (not remove it), the expiry time
                    // cannot be brought forward (T156784)
                    if ( !$this->canRemove( $group ) &&
                        isset( $existingUGMs[$group] ) &&
                        ( $existingUGMs[$group]->getExpiry() ?: 'infinity' ) >
                            ( $groupExpiries[$group] ?: 'infinity' )
                    ) {
                        return Status::newFatal( 'userrights-cannot-shorten-expiry', $group );
                    }
                }
            } else {
                $removegroup[] = $group;
            }
        }
 
        $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason, [], $groupExpiries );
 
        return Status::newGood();
    }
 
    public function doSaveUserGroups( $user, array $add, array $remove, $reason = '',
        array $tags = [], array $groupExpiries = []
    ) {
        // Validate input set...
        $isself = $user->getName() == $this->getUser()->getName();
        $groups = $user->getGroups();
        $ugms = $user->getGroupMemberships();
        $changeable = $this->changeableGroups();
        $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : [] );
        $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : [] );
 
        $remove = array_unique( array_intersect( $remove, $removable, $groups ) );
        $add = array_intersect( $add, $addable );
 
        // add only groups that are not already present or that need their expiry updated,
        // UNLESS the user can only add this group (not remove it) and the expiry time
        // is being brought forward (T156784)
        $add = array_filter( $add,
            static function ( $group ) use ( $groups, $groupExpiries, $removable, $ugms ) {
                if ( isset( $groupExpiries[$group] ) &&
                    !in_array( $group, $removable ) &&
                    isset( $ugms[$group] ) &&
                    ( $ugms[$group]->getExpiry() ?: 'infinity' ) >
                        ( $groupExpiries[$group] ?: 'infinity' )
                ) {
                    return false;
                }
                return !in_array( $group, $groups ) || array_key_exists( $group, $groupExpiries );
            } );
 
        $this->getHookRunner()->onChangeUserGroups( $this->getUser(), $user, $add, $remove );
 
        $oldGroups = $groups;
        $oldUGMs = $user->getGroupMemberships();
        $newGroups = $oldGroups;
 
        // Remove groups, then add new ones/update expiries of existing ones
        if ( $remove ) {
            foreach ( $remove as $index => $group ) {
                if ( !$user->removeGroup( $group ) ) {
                    unset( $remove[$index] );
                }
            }
            $newGroups = array_diff( $newGroups, $remove );
        }
        if ( $add ) {
            foreach ( $add as $index => $group ) {
                $expiry = $groupExpiries[$group] ?? null;
                if ( !$user->addGroup( $group, $expiry ) ) {
                    unset( $add[$index] );
                }
            }
            $newGroups = array_merge( $newGroups, $add );
        }
        $newGroups = array_unique( $newGroups );
        $newUGMs = $user->getGroupMemberships();
 
        // Ensure that caches are cleared
        $user->invalidateCache();
 
        // update groups in external authentication database
        $this->getHookRunner()->onUserGroupsChanged( $user, $add, $remove,
            $this->getUser(), $reason, $oldUGMs, $newUGMs );
 
        wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
        wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
        wfDebug( 'oldUGMs: ' . print_r( $oldUGMs, true ) );
        wfDebug( 'newUGMs: ' . print_r( $newUGMs, true ) );
 
        // Only add a log entry if something actually changed
        if ( $newGroups != $oldGroups || $newUGMs != $oldUGMs ) {
            $this->addLogEntry( $user, $oldGroups, $newGroups, $reason, $tags, $oldUGMs, $newUGMs );
        }
 
        return [ $add, $remove ];
    }
 
    protected static function serialiseUgmForLog( $ugm ) {
        if ( !$ugm instanceof UserGroupMembership ) {
            return null;
        }
        return [ 'expiry' => $ugm->getExpiry() ];
    }
 
    protected function addLogEntry( $user, array $oldGroups, array $newGroups, $reason,
        array $tags, array $oldUGMs, array $newUGMs
    ) {
        // make sure $oldUGMs and $newUGMs are in the same order, and serialise
        // each UGM object to a simplified array
        $oldUGMs = array_map( function ( $group ) use ( $oldUGMs ) {
            return isset( $oldUGMs[$group] ) ?
                self::serialiseUgmForLog( $oldUGMs[$group] ) :
                null;
        }, $oldGroups );
        $newUGMs = array_map( function ( $group ) use ( $newUGMs ) {
            return isset( $newUGMs[$group] ) ?
                self::serialiseUgmForLog( $newUGMs[$group] ) :
                null;
        }, $newGroups );
 
        $logEntry = new ManualLogEntry( 'rights', 'rights' );
        $logEntry->setPerformer( $this->getUser() );
        $logEntry->setTarget( $user->getUserPage() );
        $logEntry->setComment( is_string( $reason ) ? $reason : "" );
        $logEntry->setParameters( [
            '4::oldgroups' => $oldGroups,
            '5::newgroups' => $newGroups,
            'oldmetadata' => $oldUGMs,
            'newmetadata' => $newUGMs,
        ] );
        $logid = $logEntry->insert();
        if ( count( $tags ) ) {
            $logEntry->addTags( $tags );
        }
        $logEntry->publish( $logid );
    }
 
    private function editUserGroupsForm( $username ) {
        $status = $this->fetchUser( $username, true );
        if ( !$status->isOK() ) {
            $this->getOutput()->addWikiTextAsInterface(
                $status->getWikiText( false, false, $this->getLanguage() )
            );
 
            return;
        }
 
        $user = $status->value;
        '@phan-var User $user';
 
        $groups = $user->getGroups();
        $groupMemberships = $user->getGroupMemberships();
        $this->showEditUserGroupsForm( $user, $groups, $groupMemberships );
 
        // 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() );
    }
 
    public function fetchUser( $username, $writing = true ) {
        $parts = explode( $this->getConfig()->get( MainConfigNames::UserrightsInterwikiDelimiter ),
            $username );
        if ( count( $parts ) < 2 ) {
            $name = trim( $username );
            $dbDomain = '';
        } else {
            list( $name, $dbDomain ) = array_map( 'trim', $parts );
 
            if ( WikiMap::isCurrentWikiId( $dbDomain ) ) {
                $dbDomain = '';
            } else {
                if ( $writing &&
                    !$this->getAuthority()->isAllowed( 'userrights-interwiki' )
                ) {
                    return Status::newFatal( 'userrights-no-interwiki' );
                }
                if ( !UserRightsProxy::validDatabase( $dbDomain ) ) {
                    return Status::newFatal( 'userrights-nodatabase', $dbDomain );
                }
            }
        }
 
        if ( $name === '' ) {
            return Status::newFatal( 'nouserspecified' );
        }
 
        if ( $name[0] == '#' ) {
            // Numeric ID can be specified...
            // We'll do a lookup for the name internally.
            $id = intval( substr( $name, 1 ) );
 
            if ( $dbDomain == '' ) {
                $name = User::whoIs( $id );
            } else {
                $name = UserRightsProxy::whoIs( $dbDomain, $id );
            }
 
            if ( !$name ) {
                return Status::newFatal( 'noname' );
            }
        } else {
            $name = $this->userNameUtils->getCanonical( $name );
            if ( $name === false ) {
                // invalid name
                return Status::newFatal( 'nosuchusershort', $username );
            }
        }
 
        if ( $dbDomain == '' ) {
            $user = $this->userFactory->newFromName( $name );
        } else {
            $user = UserRightsProxy::newFromName( $dbDomain, $name );
        }
 
        if ( !$user || $user->isAnon() ) {
            return Status::newFatal( 'nosuchusershort', $username );
        }
 
        if ( $user instanceof User &&
            $user->isHidden() &&
            !$this->getAuthority()->isAllowed( 'hideuser' )
        ) {
            // Cannot see hidden users, pretend they don't exist
            return Status::newFatal( 'nosuchusershort', $username );
        }
 
        return Status::newGood( $user );
    }
 
    public function makeGroupNameList( $ids ) {
        if ( empty( $ids ) ) {
            return $this->msg( 'rightsnone' )->inContentLanguage()->text();
        } else {
            return implode( ', ', $ids );
        }
    }
 
    protected function switchForm() {
        $this->getOutput()->addModules( 'mediawiki.userSuggest' );
 
        $this->getOutput()->addHTML(
            Html::openElement(
                'form',
                [
                    'method' => 'get',
                    'action' => wfScript(),
                    'name' => 'uluser',
                    'id' => 'mw-userrights-form1'
                ]
            ) .
            Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
            Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
            Xml::inputLabel(
                $this->msg( 'userrights-user-editname' )->text(),
                'user',
                'username',
                30,
                $this->mTarget ? str_replace( '_', ' ', $this->mTarget ) : '',
                [
                    'class' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
                ] + (
                    // Set autofocus on blank input and error input
                    $this->mFetchedUser === null ? [ 'autofocus' => '' ] : []
                )
            ) . ' ' .
            Xml::submitButton(
                $this->msg( 'editusergroup' )->text()
            ) .
            Html::closeElement( 'fieldset' ) .
            Html::closeElement( 'form' ) . "\n"
        );
    }
 
    protected function showEditUserGroupsForm( $user, $groups, $groupMemberships ) {
        $list = $membersList = $tempList = $tempMembersList = [];
        foreach ( $groupMemberships as $ugm ) {
            $linkG = UserGroupMembership::getLink( $ugm, $this->getContext(), 'html' );
            $linkM = UserGroupMembership::getLink( $ugm, $this->getContext(), 'html',
                $user->getName() );
            if ( $ugm->getExpiry() ) {
                $tempList[] = $linkG;
                $tempMembersList[] = $linkM;
            } else {
                $list[] = $linkG;
                $membersList[] = $linkM;
 
            }
        }
 
        $autoList = [];
        $autoMembersList = [];
 
        $isUserInstance = $user instanceof User;
 
        if ( $isUserInstance ) {
            foreach ( $this->userGroupManager->getUserAutopromoteGroups( $user ) as $group ) {
                $autoList[] = UserGroupMembership::getLink( $group, $this->getContext(), 'html' );
                $autoMembersList[] = UserGroupMembership::getLink( $group, $this->getContext(),
                    'html', $user->getName() );
            }
        }
 
        $language = $this->getLanguage();
        $displayedList = $this->msg( 'userrights-groupsmember-type' )
            ->rawParams(
                $language->commaList( array_merge( $tempList, $list ) ),
                $language->commaList( array_merge( $tempMembersList, $membersList ) )
            )->escaped();
        $displayedAutolist = $this->msg( 'userrights-groupsmember-type' )
            ->rawParams(
                $language->commaList( $autoList ),
                $language->commaList( $autoMembersList )
            )->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";
        }
 
        $count = count( $autoList );
        if ( $count > 0 ) {
            $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto' )
                ->numParams( $count )
                ->params( $user->getName() )
                ->parse();
            $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
        }
 
        $systemUser = $isUserInstance && $user->isSystemUser();
        if ( $systemUser ) {
            $systemusernote = $this->msg( 'userrights-systemuser' )
                ->params( $user->getName() )
                ->parse();
            $grouplist .= '<p>' . $systemusernote . "</p>\n";
        }
 
        // Only add an email link if the user is not a system user
        $flags = $systemUser ? 0 : Linker::TOOL_LINKS_EMAIL;
        $userToolLinks = Linker::userToolLinks(
            $user->getId(),
            $user->getName(),
            false, /* default for redContribsWhenNoEdits */
            $flags
        );
 
        list( $groupCheckboxes, $canChangeAny ) =
            $this->groupCheckboxes( $groupMemberships, $user );
        $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 ) ) .
            Html::hidden(
                'conflictcheck-originalgroups',
                implode( ',', $user->getGroups() )
            ) . // Conflict detection
            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 .
                $groupCheckboxes .
                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"
        );
    }
 
    protected static function getAllGroups() {
        // TODO don't hard code false here (refers to local domain). See T14518
        return MediaWikiServices::getInstance()
            ->getUserGroupManagerFactory()
            ->getUserGroupManager( false )
            ->listAllGroups();
    }
 
    private function groupCheckboxes( $usergroups, $user ) {
        $allgroups = $this->getAllGroups();
        $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() );
 
        // Put all column info into an associative array so that extensions can
        // more easily manage it.
        $columns = [ 'unchangeable' => [], 'changeable' => [] ];
 
        foreach ( $allgroups as $group ) {
            $set = isset( $usergroups[$group] );
            // Users who can add the group, but not remove it, can only lengthen
            // expiries, not shorten them. So they should only see the expiry
            // dropdown if the group currently has a finite expiry
            $canOnlyLengthenExpiry = ( $set && $this->canAdd( $group ) &&
                !$this->canRemove( $group ) && $usergroups[$group]->getExpiry() );
            // Should the checkbox be disabled?
            $disabledCheckbox = !(
                ( $set && $this->canRemove( $group ) ) ||
                ( !$set && $this->canAdd( $group ) ) );
            // Should the expiry elements be disabled?
            $disabledExpiry = $disabledCheckbox && !$canOnlyLengthenExpiry;
            // Do we need to point out that this action is irreversible?
            $irreversible = !$disabledCheckbox && (
                ( $set && !$this->canAdd( $group ) ) ||
                ( !$set && !$this->canRemove( $group ) ) );
 
            $checkbox = [
                'set' => $set,
                'disabled' => $disabledCheckbox,
                'disabled-expiry' => $disabledExpiry,
                'irreversible' => $irreversible
            ];
 
            if ( $disabledCheckbox && $disabledExpiry ) {
                $columns['unchangeable'][$group] = $checkbox;
            } else {
                $columns['changeable'][$group] = $checkbox;
            }
        }
 
        // Build the HTML table
        $ret .= Xml::openElement( 'table', [ 'class' => 'mw-userrights-groups' ] ) .
            "<tr>\n";
        foreach ( $columns as $name => $column ) {
            if ( $column === [] ) {
                continue;
            }
            // Messages: userrights-changeable-col, userrights-unchangeable-col
            $ret .= Xml::element(
                'th',
                null,
                $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
            );
        }
 
        $ret .= "</tr>\n<tr>\n";
        $uiLanguage = $this->getLanguage();
        $userName = $user->getName();
        foreach ( $columns as $column ) {
            if ( $column === [] ) {
                continue;
            }
            $ret .= "\t<td style='vertical-align:top;'>\n";
            foreach ( $column as $group => $checkbox ) {
                $attr = [ 'class' => 'mw-userrights-groupcheckbox' ];
                if ( $checkbox['disabled'] ) {
                    $attr['disabled'] = 'disabled';
                }
 
                $member = $uiLanguage->getGroupMemberName( $group, $userName );
                if ( $checkbox['irreversible'] ) {
                    $text = $this->msg( 'userrights-irreversible-marker', $member )->text();
                } elseif ( $checkbox['disabled'] && !$checkbox['disabled-expiry'] ) {
                    $text = $this->msg( 'userrights-no-shorten-expiry-marker', $member )->text();
                } else {
                    $text = $member;
                }
                $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
                    "wpGroup-" . $group, $checkbox['set'], $attr );
 
                if ( $this->canProcessExpiries() ) {
                    $uiUser = $this->getUser();
 
                    $currentExpiry = isset( $usergroups[$group] ) ?
                        $usergroups[$group]->getExpiry() :
                        null;
 
                    // If the user can't modify the expiry, print the current expiry below
                    // it in plain text. Otherwise provide UI to set/change the expiry
                    if ( $checkbox['set'] &&
                        ( $checkbox['irreversible'] || $checkbox['disabled-expiry'] )
                    ) {
                        if ( $currentExpiry ) {
                            $expiryFormatted = $uiLanguage->userTimeAndDate( $currentExpiry, $uiUser );
                            $expiryFormattedD = $uiLanguage->userDate( $currentExpiry, $uiUser );
                            $expiryFormattedT = $uiLanguage->userTime( $currentExpiry, $uiUser );
                            $expiryHtml = Xml::element( 'span', null,
                                $this->msg( 'userrights-expiry-current' )->params(
                                $expiryFormatted, $expiryFormattedD, $expiryFormattedT )->text() );
                        } else {
                            $expiryHtml = Xml::element( 'span', null,
                                $this->msg( 'userrights-expiry-none' )->text() );
                        }
                        // T171345: Add a hidden form element so that other groups can still be manipulated,
                        // otherwise saving errors out with an invalid expiry time for this group.
                        $expiryHtml .= Html::hidden( "wpExpiry-$group",
                            $currentExpiry ? 'existing' : 'infinite' );
                        $expiryHtml .= "<br />\n";
                    } else {
                        $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",
                            "mw-input-wpExpiry-$group", // forward compatibility with HTMLForm
                            $currentExpiry ? 'existing' : 'infinite'
                        );
                        if ( $checkbox['disabled-expiry'] ) {
                            $expiryFormOptions->setAttribute( 'disabled', 'disabled' );
                        }
 
                        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',
                        ];
                        if ( $checkbox['disabled-expiry'] ) {
                            $attribs['disabled'] = 'disabled';
                        }
                        $expiryHtml .= Xml::input( "wpExpiry-$group-other", 30, '', $attribs );
 
                        // If the user group is set but the checkbox is disabled, mimic a
                        // checked checkbox in the form submission
                        if ( $checkbox['set'] && $checkbox['disabled'] ) {
                            $expiryHtml .= Html::hidden( "wpGroup-$group", 1 );
                        }
 
                        $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" . ( ( $checkbox['disabled'] && $checkbox['disabled-expiry'] )
                    ? Xml::tags( 'div', [ 'class' => 'mw-userrights-disabled' ], $checkboxHtml )
                    : Xml::tags( 'div', [], $checkboxHtml )
                ) . "\n";
            }
            $ret .= "\t</td>\n";
        }
        $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 
        return [ $ret, (bool)$columns['changeable'] ];
    }
 
    private function canRemove( $group ) {
        $groups = $this->changeableGroups();
 
        return in_array(
            $group,
            $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
        );
    }
 
    private function canAdd( $group ) {
        $groups = $this->changeableGroups();
 
        return in_array(
            $group,
            $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
        );
    }
 
    protected function changeableGroups() {
        return $this->userGroupManager->getGroupsChangeableBy( $this->getContext()->getAuthority() );
    }
 
    protected function showLogFragment( $user, $output ) {
        $rightsLogPage = new LogPage( 'rights' );
        $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
        LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
    }
 
    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 );
    }
 
    protected function getGroupName() {
        return 'users';
    }
}