WebInstaller.php

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<?php
namespace MediaWiki\Installer;
 
use Exception;
use MediaWiki\Context\RequestContext;
use MediaWiki\Html\Html;
use MediaWiki\Installer\Task\TaskFactory;
use MediaWiki\Installer\Task\TaskList;
use MediaWiki\Installer\Task\TaskRunner;
use MediaWiki\Languages\LanguageNameUtils;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\Request\ContentSecurityPolicy;
use MediaWiki\Request\WebRequest;
use MediaWiki\Status\Status;
use Wikimedia\HtmlArmor\HtmlArmor;
 
class WebInstaller extends Installer {
 
    public $output;
 
    public $request;
 
    protected $session;
 
    protected $phpErrors;
 
    public $pageSequence = [
        'Language',
        'ExistingWiki',
        'Welcome',
        'DBConnect',
        'Upgrade',
        'DBSettings',
        'Name',
        'Options',
        'Install',
        'Complete',
    ];
 
    protected $otherPages = [
        'Restart',
        'ReleaseNotes',
        'Copying',
        'UpgradeDoc', // Can't use Upgrade due to Upgrade step
    ];
 
    protected $happyPages;
 
    protected $skippedPages;
 
    public $showSessionWarning = false;
 
    protected $tabIndex = 1;
 
    protected $helpBoxId = 1;
 
    protected $currentPageName;
 
    public function __construct( WebRequest $request ) {
        parent::__construct();
        $this->output = new WebInstallerOutput( $this );
        $this->request = $request;
    }
 
    public function execute( array $session ) {
        $this->session = $session;
 
        if ( isset( $session['settings'] ) ) {
            $this->settings = $session['settings'] + $this->settings;
            // T187586 MediaWikiServices works with globals
            foreach ( $this->settings as $key => $val ) {
                $GLOBALS[$key] = $val;
            }
        }
 
        $this->setupLanguage();
 
        if ( ( $this->getVar( '_InstallDone' ) || $this->getVar( '_UpgradeDone' ) )
            && $this->request->getVal( 'localsettings' )
        ) {
            $this->outputLS();
            return $this->session;
        }
 
        $isCSS = $this->request->getCheck( 'css' );
        if ( $isCSS ) {
            $this->outputCss();
            return $this->session;
        }
 
        $this->happyPages = $session['happyPages'] ?? [];
 
        $this->skippedPages = $session['skippedPages'] ?? [];
 
        $lowestUnhappy = $this->getLowestUnhappy();
 
        # Get the page name.
        $pageName = $this->request->getVal( 'page', '' );
 
        if ( in_array( $pageName, $this->otherPages ) ) {
            # Out of sequence
            $pageId = false;
            $page = $this->getPageByName( $pageName );
        } else {
            # Main sequence
            if ( !$pageName || !in_array( $pageName, $this->pageSequence ) ) {
                $pageId = $lowestUnhappy;
            } else {
                $pageId = array_search( $pageName, $this->pageSequence );
            }
 
            # If necessary, move back to the lowest-numbered unhappy page
            if ( $pageId > $lowestUnhappy ) {
                $pageId = $lowestUnhappy;
                if ( $lowestUnhappy == 0 ) {
                    # Knocked back to start, possible loss of session data.
                    $this->showSessionWarning = true;
                }
            }
 
            $pageName = $this->pageSequence[$pageId];
            $page = $this->getPageByName( $pageName );
        }
 
        # If a back button was submitted, go back without submitting the form data.
        if ( $this->request->wasPosted() && $this->request->getBool( 'submit-back' ) ) {
            if ( $this->request->getVal( 'lastPage' ) ) {
                $nextPage = $this->request->getVal( 'lastPage' );
            } elseif ( $pageId !== false ) {
                # Main sequence page
                # Skip the skipped pages
                $nextPageId = $pageId;
 
                do {
                    $nextPageId--;
                    $nextPage = $this->pageSequence[$nextPageId];
                } while ( isset( $this->skippedPages[$nextPage] ) );
            } else {
                $nextPage = $this->pageSequence[$lowestUnhappy];
            }
 
            $this->output->redirect( $this->getUrl( [ 'page' => $nextPage ] ) );
 
            return $this->finish();
        }
 
        # Execute the page.
        $this->currentPageName = $page->getName();
        $this->startPageWrapper( $pageName );
 
        if ( $page->isSlow() ) {
            $this->disableTimeLimit();
        }
 
        $result = $page->execute();
 
        $this->endPageWrapper();
 
        if ( $result == 'skip' ) {
            # Page skipped without explicit submission.
            # Skip it when we click "back" so that we don't just go forward again.
            $this->skippedPages[$pageName] = true;
            $result = 'continue';
        } else {
            unset( $this->skippedPages[$pageName] );
        }
 
        # If it was posted, the page can request a continue to the next page.
        if ( $result === 'continue' && !$this->output->headerDone() ) {
            if ( $pageId !== false ) {
                $this->happyPages[$pageId] = true;
            }
 
            $lowestUnhappy = $this->getLowestUnhappy();
 
            if ( $this->request->getVal( 'lastPage' ) ) {
                $nextPage = $this->request->getVal( 'lastPage' );
            } elseif ( $pageId !== false ) {
                $nextPage = $this->pageSequence[$pageId + 1];
            } else {
                $nextPage = $this->pageSequence[$lowestUnhappy];
            }
 
            if ( array_search( $nextPage, $this->pageSequence ) > $lowestUnhappy ) {
                $nextPage = $this->pageSequence[$lowestUnhappy];
            }
 
            $this->output->redirect( $this->getUrl( [ 'page' => $nextPage ] ) );
        }
 
        return $this->finish();
    }
 
    public function getLowestUnhappy() {
        if ( count( $this->happyPages ) == 0 ) {
            return 0;
        } else {
            return max( array_keys( $this->happyPages ) ) + 1;
        }
    }
 
    public function startSession() {
        if ( wfIniGetBool( 'session.auto_start' ) || session_id() ) {
            // Done already
            return true;
        }
 
        // Use secure cookies if we are on HTTPS
        $options = [];
        if ( $this->request->getProtocol() === 'https' ) {
            $options['cookie_secure'] = '1';
        }
 
        $this->phpErrors = [];
        set_error_handler( $this->errorHandler( ... ) );
        try {
            session_name( 'mw_installer_session' );
            session_start( $options );
        } catch ( Exception $e ) {
            restore_error_handler();
            throw $e;
        }
        restore_error_handler();
 
        if ( $this->phpErrors ) {
            return false;
        }
 
        return true;
    }
 
    public function getFingerprint() {
        // Get the base URL of the installation
        $url = $this->request->getFullRequestURL();
        if ( preg_match( '!^(.*\?)!', $url, $m ) ) {
            // Trim query string
            $url = $m[1];
        }
        if ( preg_match( '!^(.*)/[^/]*/[^/]*$!', $url, $m ) ) {
            // This... seems to try to get the base path from
            // the /mw-config/index.php. Kinda scary though?
            $url = $m[1];
        }
 
        return md5( serialize( [
            'local path' => dirname( __DIR__ ),
            'url' => $url,
            'version' => MW_VERSION
        ] ) );
    }
 
    public function showError( $msg, ...$params ) {
        if ( !( $msg instanceof Message ) ) {
            $msg = wfMessage(
                $msg,
                array_map( 'htmlspecialchars', $params )
            );
        }
        $text = $msg->useDatabase( false )->parse();
        $box = Html::errorBox( $text, '', 'config-error-box' );
        $this->output->addHTML( $box );
    }
 
    public function errorHandler( $errno, $errstr ) {
        $this->phpErrors[] = $errstr;
    }
 
    public function finish() {
        $this->output->output();
 
        $this->session['happyPages'] = $this->happyPages;
        $this->session['skippedPages'] = $this->skippedPages;
        $this->session['settings'] = $this->settings;
 
        return $this->session;
    }
 
    public function reset() {
        $this->session = [];
        $this->happyPages = [];
        $this->settings = [];
    }
 
    public function getUrl( $query = [] ) {
        $url = $this->request->getRequestURL();
        # Remove existing query
        $url = preg_replace( '/\?.*$/', '', $url );
 
        if ( $query ) {
            $url .= '?' . wfArrayToCgi( $query );
        }
 
        return $url;
    }
 
    public function getPageByName( $pageName ) {
        $pageClass = 'MediaWiki\\Installer\\WebInstaller' . $pageName;
 
        return new $pageClass( $this );
    }
 
    public function getSession( $name, $default = null ) {
        return $this->session[$name] ?? $default;
    }
 
    public function setSession( $name, $value ) {
        $this->session[$name] = $value;
    }
 
    public function nextTabIndex() {
        return $this->tabIndex++;
    }
 
    public function setupLanguage() {
        global $wgLang, $wgLanguageCode;
 
        if ( $this->getSession( 'test' ) === null && !$this->request->wasPosted() ) {
            $wgLanguageCode = $this->getAcceptLanguage();
            $wgLang = MediaWikiServices::getInstance()->getLanguageFactory()
                ->getLanguage( $wgLanguageCode );
            RequestContext::getMain()->setLanguage( $wgLang );
            $this->setVar( 'wgLanguageCode', $wgLanguageCode );
            $this->setVar( '_UserLang', $wgLanguageCode );
        } else {
            $wgLanguageCode = $this->getVar( 'wgLanguageCode' );
        }
    }
 
    public function getAcceptLanguage() {
        global $wgLanguageCode;
 
        $mwLanguages = MediaWikiServices::getInstance()
            ->getLanguageNameUtils()
            ->getLanguageNames( LanguageNameUtils::AUTONYMS, LanguageNameUtils::SUPPORTED );
        $headerLanguages = array_keys( $this->request->getAcceptLang() );
 
        foreach ( $headerLanguages as $lang ) {
            if ( isset( $mwLanguages[$lang] ) ) {
                return $lang;
            }
        }
 
        return $wgLanguageCode;
    }
 
    private function startPageWrapper( $currentPageName ) {
        $s = "<div class=\"config-page-wrapper\">\n";
        $s .= "<div class=\"config-page\">\n";
        $s .= "<div class=\"config-page-list cdx-card\"><span class=\"cdx-card__text\">";
        $s .= "<span class=\"cdx-card__text__description\"><ul>\n";
        $lastHappy = -1;
 
        foreach ( $this->pageSequence as $id => $pageName ) {
            $happy = !empty( $this->happyPages[$id] );
            $s .= $this->getPageListItem(
                $pageName,
                $happy || $lastHappy == $id - 1,
                $currentPageName
            );
 
            if ( $happy ) {
                $lastHappy = $id;
            }
        }
 
        $s .= "</ul><br/><ul>\n";
        $s .= $this->getPageListItem( 'Restart', true, $currentPageName );
        // End list pane
        $s .= "</ul></span></span></div>\n";
 
        // Messages:
        // config-page-language, config-page-welcome, config-page-dbconnect, config-page-upgrade,
        // config-page-dbsettings, config-page-name, config-page-options, config-page-install,
        // config-page-complete, config-page-restart, config-page-releasenotes,
        // config-page-copying, config-page-upgradedoc, config-page-existingwiki
        $s .= Html::element( 'h2', [],
            wfMessage( 'config-page-' . strtolower( $currentPageName ) )->text() );
 
        $this->output->addHTMLNoFlush( $s );
    }
 
    private function getPageListItem( $pageName, $enabled, $currentPageName ) {
        $s = "<li class=\"config-page-list-item\">";
 
        // Messages:
        // config-page-language, config-page-welcome, config-page-dbconnect, config-page-upgrade,
        // config-page-dbsettings, config-page-name, config-page-options, config-page-install,
        // config-page-complete, config-page-restart, config-page-releasenotes,
        // config-page-copying, config-page-upgradedoc, config-page-existingwiki
        $name = wfMessage( 'config-page-' . strtolower( $pageName ) )->text();
 
        if ( $enabled ) {
            $query = [ 'page' => $pageName ];
 
            if ( !in_array( $pageName, $this->pageSequence ) ) {
                if ( in_array( $currentPageName, $this->pageSequence ) ) {
                    $query['lastPage'] = $currentPageName;
                }
 
                $link = Html::element( 'a',
                    [
                        'href' => $this->getUrl( $query )
                    ],
                    $name
                );
            } else {
                $link = htmlspecialchars( $name );
            }
 
            if ( $pageName == $currentPageName ) {
                $s .= "<span class=\"config-page-current\">$link</span>";
            } else {
                $s .= $link;
            }
        } else {
            $s .= Html::element( 'span',
                [
                    'class' => 'config-page-disabled'
                ],
                $name
            );
        }
 
        $s .= "</li>\n";
 
        return $s;
    }
 
    private function endPageWrapper() {
        $this->output->addHTMLNoFlush(
            "<div class=\"visualClear\"></div>\n" .
            "</div>\n" .
            "<div class=\"visualClear\"></div>\n" .
            "</div>" );
    }
 
    public function getHelpBox( $msg, ...$params ) {
        $params = array_map( 'htmlspecialchars', $params );
        $text = wfMessage( $msg, $params )->useDatabase( false )->plain();
        $html = $this->parse( $text, true );
 
        return "<div class=\"config-help-field-container\">\n" .
            "<a class=\"config-help-field-hint\" title=\"" .
            wfMessage( 'config-help-tooltip' )->escaped() . "\">ℹ️ " .
            wfMessage( 'config-help' )->escaped() . "</a>\n" .
            "<div class=\"config-help-field-content config-help-field-content-hidden " .
            "cdx-message cdx-message--block cdx-message--notice\" style=\"margin: 10px\">" .
            "<div class=\"cdx-message__content\">" . $html . "</div></div>\n" .
            "</div>\n";
    }
 
    public function getInfoBox( $text ) {
        $html = ( $text instanceof HtmlArmor ) ?
            HtmlArmor::getHtml( $text ) :
            $this->parse( $text, true );
        return '<div class="cdx-message cdx-message--block cdx-message--notice">' .
            '<span class="cdx-message__icon"></span><div class="cdx-message__content">' .
            '<p><strong>' . wfMessage( 'config-information' )->escaped() . '</strong></p>' .
            $html .
            "</div></div>\n";
    }
 
    public function showSuccess( $msg, ...$params ) {
        $html = '<div class="cdx-message cdx-message--block cdx-message--success">' .
            '<span class="cdx-message__icon"></span><div class="cdx-message__content">' .
            $this->parse( wfMessage( $msg, $params )->useDatabase( false )->plain() ) .
            "</div></div>\n";
        $this->output->addHTML( $html );
    }
 
    public function showMessage( $msg, ...$params ) {
        $html = '<div class="cdx-message cdx-message--block cdx-message--notice">' .
            '<span class="cdx-message__icon"></span><div class="cdx-message__content">' .
            $this->parse( wfMessage( $msg, $params )->useDatabase( false )->plain() ) .
            "</div></div>\n";
        $this->output->addHTML( $html );
    }
 
    public function showWarning( $msg, ...$params ) {
        $html = '<div class="cdx-message cdx-message--block cdx-message--warning">' .
            '<span class="cdx-message__icon"></span><div class="cdx-message__content">' .
            $this->parse( wfMessage( $msg, $params )->useDatabase( false )->plain() ) .
            "</div></div>\n";
        $this->output->addHTML( $html );
    }
 
    public function showStatusMessage( Status $status ) {
        // Show errors at the top in web installer to make them easier to notice
        foreach ( $status->getMessages( 'error' ) as $msg ) {
            $this->showWarning( $msg );
        }
        foreach ( $status->getMessages( 'warning' ) as $msg ) {
            $this->showWarning( $msg );
        }
    }
 
    public function label( $msg, $forId, $contents, $helpData = "" ) {
        if ( strval( $msg ) == '' ) {
            $labelText = "\u{00A0}";
        } else {
            $labelText = wfMessage( $msg )->escaped();
        }
 
        $attributes = [ 'class' => 'config-label' ];
 
        if ( $forId ) {
            $attributes['for'] = $forId;
        }
 
        return "<div class=\"config-block\">\n" .
            "  <div class=\"config-block-label\">\n" .
            Html::rawElement( 'label',
                $attributes,
                $labelText
            ) . "\n" .
            $helpData .
            "  </div>\n" .
            "  <div class=\"config-block-elements\">\n" .
            $contents .
            "  </div>\n" .
            "</div>\n";
    }
 
    public function getTextBox( $params ) {
        if ( !isset( $params['controlName'] ) ) {
            $params['controlName'] = 'config_' . $params['var'];
        }
 
        if ( !isset( $params['value'] ) ) {
            $params['value'] = $this->getVar( $params['var'] );
        }
 
        if ( !isset( $params['attribs'] ) ) {
            $params['attribs'] = [];
        }
        if ( !isset( $params['help'] ) ) {
            $params['help'] = "";
        }
 
        return $this->label(
            $params['label'],
            $params['controlName'],
            "<div class=\"cdx-text-input\">" .
            Html::input(
                $params['controlName'],
                $params['value'],
                $params['attribs']['type'] ?? 'text',
                $params['attribs'] + [
                    'id' => $params['controlName'],
                    'size' => 30, // intended to be overridden by CSS
                    'class' => 'cdx-text-input__input',
                    'tabindex' => $this->nextTabIndex()
                ]
            ) . "</div>",
            $params['help']
        );
    }
 
    public function getTextArea( $params ) {
        if ( !isset( $params['controlName'] ) ) {
            $params['controlName'] = 'config_' . $params['var'];
        }
 
        if ( !isset( $params['value'] ) ) {
            $params['value'] = $this->getVar( $params['var'] );
        }
 
        if ( !isset( $params['attribs'] ) ) {
            $params['attribs'] = [];
        }
        if ( !isset( $params['help'] ) ) {
            $params['help'] = "";
        }
 
        return $this->label(
            $params['label'],
            $params['controlName'],
            Html::textarea(
                $params['controlName'],
                $params['value'],
                $params['attribs'] + [
                    'id' => $params['controlName'],
                    'cols' => 30,
                    'rows' => 5,
                    'class' => 'config-input-text',
                    'tabindex' => $this->nextTabIndex()
                ]
            ),
            $params['help']
        );
    }
 
    public function getPasswordBox( $params ) {
        if ( !isset( $params['value'] ) ) {
            $params['value'] = $this->getVar( $params['var'] );
        }
 
        if ( !isset( $params['attribs'] ) ) {
            $params['attribs'] = [];
        }
 
        $params['value'] = $this->getFakePassword( $params['value'] );
        $params['attribs']['type'] = 'password';
 
        return $this->getTextBox( $params );
    }
 
    public function getCheckBox( $params ) {
        if ( !isset( $params['controlName'] ) ) {
            $params['controlName'] = 'config_' . $params['var'];
        }
 
        if ( !isset( $params['value'] ) ) {
            $params['value'] = $this->getVar( $params['var'] );
        }
 
        if ( !isset( $params['attribs'] ) ) {
            $params['attribs'] = [];
        }
        if ( !isset( $params['help'] ) ) {
            $params['help'] = "";
        }
        if ( !isset( $params['labelAttribs'] ) ) {
            $params['labelAttribs'] = [];
        }
        $labelText = $params['rawtext'] ?? $this->parse( wfMessage( $params['label'] )->plain() );
        $labelText = '<span class="cdx-label__label__text"> ' . $labelText . '</span>';
        Html::addClass( $params['attribs']['class'], 'cdx-checkbox__input' );
        Html::addClass( $params['labelAttribs']['class'], 'cdx-label__label' );
 
        return "<div class=\"cdx-checkbox\" style=\"margin-top: 12px; margin-bottom: 2px;\">" .
            "<div class=\"cdx-checkbox__wrapper\">\n" .
            Html::check(
                $params['controlName'],
                $params['value'],
                $params['attribs'] + [
                    'id' => $params['controlName'],
                    'tabindex' => $this->nextTabIndex()
                ]
            ) .
            "<span class=\"cdx-checkbox__icon\"></span>" .
            "<div class=\"cdx-checkbox__label cdx-label\">" .
            Html::rawElement(
                'label',
                $params['labelAttribs'] + [
                    'for' => $params['controlName']
                ],
                $labelText
                ) .
            "</div></div></div>\n" . $params['help'];
    }
 
    public function getRadioSet( $params ) {
        $items = $this->getRadioElements( $params );
 
        $label = $params['label'] ?? '';
 
        if ( !isset( $params['controlName'] ) ) {
            $params['controlName'] = 'config_' . $params['var'];
        }
 
        if ( !isset( $params['help'] ) ) {
            $params['help'] = "";
        }
 
        $s = "";
        foreach ( $items as $item ) {
            $s .= "$item\n";
        }
 
        return $this->label( $label, $params['controlName'], $s, $params['help'] );
    }
 
    public function getRadioElements( $params ) {
        if ( !isset( $params['controlName'] ) ) {
            $params['controlName'] = 'config_' . $params['var'];
        }
 
        if ( !isset( $params['value'] ) ) {
            $params['value'] = $this->getVar( $params['var'] );
        }
 
        $items = [];
 
        foreach ( $params['values'] as $value ) {
            $itemAttribs = [];
 
            if ( isset( $params['commonAttribs'] ) ) {
                $itemAttribs = $params['commonAttribs'];
            }
 
            if ( isset( $params['itemAttribs'][$value] ) ) {
                $itemAttribs = $params['itemAttribs'][$value] + $itemAttribs;
            }
 
            $checked = $value == $params['value'];
            $id = $params['controlName'] . '_' . $value;
            $itemAttribs['id'] = $id;
            $itemAttribs['tabindex'] = $this->nextTabIndex();
            Html::addClass( $itemAttribs['class'], 'cdx-radio__input' );
 
            $radioText = $this->parse(
                isset( $params['itemLabels'] ) ?
                    wfMessage( $params['itemLabels'][$value] )->plain() :
                    wfMessage( $params['itemLabelPrefix'] . strtolower( $value ) )->plain()
            );
            $items[$value] =
                '<span class="cdx-radio">' .
                '<span class="cdx-radio__wrapper">' .
                Html::radio( $params['controlName'], $checked, $itemAttribs + [ 'value' => $value ] ) .
                '<span class="cdx-radio__icon"></span>' .
                '<span class="cdx-radio__label cdx-label">' .
                Html::rawElement(
                    'label',
                    [ 'for' => $id, 'class' => 'cdx-label__label' ],
                    '<span class="cdx-label__label__text">' . $radioText . '</span>'
                ) . '</span></span></span>';
        }
 
        return $items;
    }
 
    public function showStatusBox( $status ) {
        if ( !$status->isGood() ) {
            $html = $status->getHTML();
 
            if ( $status->isOK() ) {
                $box = Html::warningBox( $html, 'config-warning-box' );
            } else {
                $box = Html::errorBox( $html, '', 'config-error-box' );
            }
 
            $this->output->addHTML( $box );
        }
    }
 
    public function setVarsFromRequest( $varNames, $prefix = 'config_' ) {
        $newValues = [];
 
        foreach ( $varNames as $name ) {
            $value = $this->request->getVal( $prefix . $name );
            // T32524, do not trim passwords
            if ( $value !== null && stripos( $name, 'password' ) === false ) {
                $value = trim( $value );
            }
            $newValues[$name] = $value;
 
            if ( $value === null ) {
                // Checkbox?
                $this->setVar( $name, false );
            } elseif ( stripos( $name, 'password' ) !== false ) {
                $this->setPassword( $name, $value );
            } else {
                $this->setVar( $name, $value );
            }
        }
 
        return $newValues;
    }
 
    public function getDocUrl( $page ) {
        $query = [ 'page' => $page ];
 
        if ( in_array( $this->currentPageName, $this->pageSequence ) ) {
            $query['lastPage'] = $this->currentPageName;
        }
 
        return $this->getUrl( $query );
    }
 
    public function makeLinkItem( $url, $linkText ) {
        return Html::rawElement( 'li', [],
            Html::element( 'a', [ 'href' => $url ], $linkText )
        );
    }
 
    public function getLocalSettingsLocation() {
        return false;
    }
 
    public function envCheckPath() {
        // PHP_SELF isn't available sometimes, such as when PHP is CGI but
        // cgi.fix_pathinfo is disabled. In that case, fall back to SCRIPT_NAME
        // to get the path to the current script... hopefully it's reliable. SIGH
        $path = false;
        if ( !empty( $_SERVER['PHP_SELF'] ) ) {
            $path = $_SERVER['PHP_SELF'];
        } elseif ( !empty( $_SERVER['SCRIPT_NAME'] ) ) {
            $path = $_SERVER['SCRIPT_NAME'];
        }
        if ( $path === false ) {
            $this->showError( 'config-no-uri' );
            return false;
        }
 
        return parent::envCheckPath();
    }
 
    protected function detectWebPaths() {
        // PHP_SELF isn't available sometimes, such as when PHP is CGI but
        // cgi.fix_pathinfo is disabled. In that case, fall back to SCRIPT_NAME
        // to get the path to the current script... hopefully it's reliable. SIGH
        $path = false;
        if ( !empty( $_SERVER['PHP_SELF'] ) ) {
            $path = $_SERVER['PHP_SELF'];
        } elseif ( !empty( $_SERVER['SCRIPT_NAME'] ) ) {
            $path = $_SERVER['SCRIPT_NAME'];
        }
        if ( $path !== false ) {
            $scriptPath = preg_replace( '{^(.*)/(mw-)?config.*$}', '$1', $path );
 
            return [
                'wgScriptPath' => "$scriptPath",
                // Update variables set from Setup.php that are derived from wgScriptPath
                'wgScript' => "$scriptPath/index.php",
                'wgLoadScript' => "$scriptPath/load.php",
                'wgStylePath' => "$scriptPath/skins",
                'wgLocalStylePath' => "$scriptPath/skins",
                'wgExtensionAssetsPath' => "$scriptPath/extensions",
                'wgUploadPath' => "$scriptPath/images",
                'wgResourceBasePath' => "$scriptPath",
            ];
        }
        return [];
    }
 
    protected function envGetDefaultServer() {
        $assumeProxiesUseDefaultProtocolPorts =
            $this->getVar( 'wgAssumeProxiesUseDefaultProtocolPorts' );
 
        return WebRequest::detectServer( $assumeProxiesUseDefaultProtocolPorts );
    }
 
    public function getDefaultServer() {
        return $this->envGetDefaultServer();
    }
 
    private function outputLS() {
        ContentSecurityPolicy::sendRestrictiveHeader();
        $this->request->response()->header( 'Content-type: application/x-httpd-php' );
        $this->request->response()->header(
            'Content-Disposition: attachment; filename="LocalSettings.php"'
        );
 
        $ls = InstallerOverrides::getLocalSettingsGenerator( $this );
        $rightsProfile = $this->rightsProfiles[$this->getVar( '_RightsProfile' )];
        foreach ( $rightsProfile as $group => $rightsArr ) {
            $ls->setGroupRights( $group, $rightsArr );
        }
        echo $ls->getText();
    }
 
    public function outputCss() {
        $this->request->response()->header( 'Content-type: text/css' );
        ContentSecurityPolicy::sendRestrictiveHeader();
        echo $this->output->getCSS();
    }
 
    public function getPhpErrors() {
        return $this->phpErrors;
    }
 
    public function needsUpgrade() {
        return $this->getDBInstaller()->needsUpgrade();
    }
 
    public function doUpgrade() {
        $dbInstaller = $this->getDBInstaller();
        $dbInstaller->preUpgrade();
 
        $taskList = new TaskList;
        $taskFactory = $this->getTaskFactory();
        $taskFactory->registerWebUpgradeTasks( $taskList );
        $taskRunner = new TaskRunner( $taskList, $taskFactory, TaskFactory::PROFILE_WEB_UPGRADE );
 
        ob_start( $this->outputHandler( ... ) );
        try {
            $status = $taskRunner->execute();
            $ret = $status->isOK();
 
            $this->setVar( '_UpgradeDone', true );
        } catch ( Exception $e ) {
            // TODO: Should this use MWExceptionRenderer?
            echo "\nAn error occurred:\n";
            echo $e->getMessage();
            $ret = false;
        }
        ob_end_flush();
 
        return $ret;
    }
 
    public function outputHandler( string $string ): string {
        return htmlspecialchars( $string );
    }
 
}