PermissionsError.php

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<?php
use MediaWiki\MediaWikiServices;
use MediaWiki\Permissions\PermissionStatus;
 
class PermissionsError extends ErrorPageError {
    public $permission, $errors;
 
    public function __construct( $permission, $errors = [] ) {
        if ( $errors instanceof PermissionStatus ) {
            $errors = $errors->toLegacyErrorArray();
        }
 
        if ( $permission === null && !$errors ) {
            throw new \InvalidArgumentException( __METHOD__ .
                ': $permission and $errors cannot both be empty' );
        }
 
        $this->permission = $permission;
 
        if ( !count( $errors ) ) {
            $groups = [];
            foreach ( MediaWikiServices::getInstance()
                ->getGroupPermissionsLookup()
                // @phan-suppress-next-line PhanTypeMismatchArgumentNullable Null on permission is check when used here
                ->getGroupsWithPermission( $this->permission ) as $group
            ) {
                $groups[] = UserGroupMembership::getLink( $group, RequestContext::getMain(), 'wiki' );
            }
 
            if ( $groups ) {
                $errors[] = [ 'badaccess-groups', Message::listParam( $groups, 'comma' ), count( $groups ) ];
            } else {
                $errors[] = [ 'badaccess-group0' ];
            }
        }
 
        $this->errors = $errors;
 
        // Give the parent class something to work with
        parent::__construct( 'permissionserrors', Message::newFromSpecifier( $errors[0] ) );
    }
 
    public function report( $action = self::SEND_OUTPUT ) {
        global $wgOut;
 
        $wgOut->showPermissionsErrorPage( $this->errors, $this->permission );
        if ( $action === self::SEND_OUTPUT ) {
            $wgOut->output();
        }
    }
}