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\"><strong>\n$1\n</strong></div><div id=\"mw-pref-clear\"></div>",
                                'savedprefs'
                        );
                }

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

                $htmlForm->show();
        }

        private function showResetForm() {
                $this->getOutput()->addWikiMsg( 'prefs-reset-intro' );

                $htmlForm = new HTMLForm( array(), $this->getContext(), 'prefs-restore' );

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

                $htmlForm->show();
        }

        public function submitReset( $formData ) {
                $user = $this->getUser();
                $user->resetOptions();
                $user->saveSettings();

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

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

                return true;
        }
}