SpecialPreferences.php

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<?php
class SpecialPreferences extends SpecialPage {
    function __construct() {
        parent::__construct( 'Preferences' );
    }

    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $out = $this->getOutput();
        $out->disallowUserJs(); # Prevent hijacked user scripts from sniffing passwords etc.

        $user = $this->getUser();
        if ( $user->isAnon() ) {
            throw new ErrorPageError(
                'prefsnologin',
                'prefsnologintext',
                array( $this->getTitle()->getPrefixedDBkey() )
            );
        }
        $this->checkReadOnly();

        if ( $par == 'reset' ) {
            $this->showResetForm();

            return;
        }

        $out->addModules( 'mediawiki.special.preferences' );

        if ( $this->getRequest()->getCheck( 'success' ) ) {
            $out->wrapWikiMsg(
                "<div class=\"successbox\">\n$1\n</div>",
                'savedprefs'
            );
        }

        $htmlForm = Preferences::getFormObject( $user, $this->getContext() );
        $htmlForm->setSubmitCallback( array( 'Preferences', 'tryUISubmit' ) );

        $htmlForm->show();
    }

    private function showResetForm() {
        if ( !$this->getUser()->isAllowed( 'editmyoptions' ) ) {
            throw new PermissionsError( 'editmyoptions' );
        }

        $this->getOutput()->addWikiMsg( 'prefs-reset-intro' );

        $context = new DerivativeContext( $this->getContext() );
        $context->setTitle( $this->getTitle( 'reset' ) ); // Reset subpage
        $htmlForm = new HTMLForm( array(), $context, 'prefs-restore' );

        $htmlForm->setSubmitTextMsg( 'restoreprefs' );
        $htmlForm->setSubmitCallback( array( $this, 'submitReset' ) );
        $htmlForm->suppressReset();

        $htmlForm->show();
    }

    public function submitReset( $formData ) {
        if ( !$this->getUser()->isAllowed( 'editmyoptions' ) ) {
            throw new PermissionsError( 'editmyoptions' );
        }

        $user = $this->getUser();
        $user->resetOptions( 'all', $this->getContext() );
        $user->saveSettings();

        $url = $this->getTitle()->getFullURL( 'success' );

        $this->getOutput()->redirect( $url );

        return true;
    }

    protected function getGroupName() {
        return 'users';
    }
}