PermissionsError.php

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<?php
class PermissionsError extends ErrorPageError {
    public $permission, $errors;

    public function __construct( $permission, $errors = [] ) {
        global $wgLang;

        if ( $permission === null && !$errors ) {
            throw new \InvalidArgumentException( __METHOD__ .
                ': $permission and $errors cannot both be empty' );
        }

        $this->permission = $permission;

        if ( !count( $errors ) ) {
            $groups = array_map(
                [ 'User', 'makeGroupLinkWiki' ],
                User::getGroupsWithPermission( $this->permission )
            );

            if ( $groups ) {
                $errors[] = [ 'badaccess-groups', $wgLang->commaList( $groups ), count( $groups ) ];
            } else {
                $errors[] = [ 'badaccess-group0' ];
            }
        }

        $this->errors = $errors;
    }

    public function report() {
        global $wgOut;

        $wgOut->showPermissionsErrorPage( $this->errors, $this->permission );
        $wgOut->output();
    }
}