WebInstaller.php

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<?php
use MediaWiki\MediaWikiServices;

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',
        'Readme',
        'ReleaseNotes',
        'Copying',
        'UpgradeDoc', // Can't use Upgrade due to Upgrade step
    ];

    protected $happyPages;

    protected $skippedPages;

    public $showSessionWarning = false;

    protected $tabIndex = 1;

    protected $currentPageName;

    public function __construct( WebRequest $request ) {
        parent::__construct();
        $this->output = new WebInstallerOutput( $this );
        $this->request = $request;

        // Add parser hooks
        $parser = MediaWikiServices::getInstance()->getParser();
        $parser->setHook( 'downloadlink', [ $this, 'downloadLinkHook' ] );
        $parser->setHook( 'doclink', [ $this, 'docLink' ] );
    }

    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->getVal( 'css' );
        if ( $isCSS ) {
            $this->outputCss();
            return $this->session;
        }

        $this->happyPages = $session['happyPages'] ?? [];

        $this->skippedPages = $session['skippedPages'] ?? [];

        $lowestUnhappy = $this->getLowestUnhappy();

        # Special case for Creative Commons partner chooser box.
        if ( $this->request->getVal( 'SubmitCC' ) ) {
            $page = $this->getPageByName( 'Options' );
            $this->output->useShortHeader();
            $this->output->allowFrames();
            $page->submitCC();

            return $this->finish();
        }

        if ( $this->request->getVal( 'ShowCC' ) ) {
            $page = $this->getPageByName( 'Options' );
            $this->output->useShortHeader();
            $this->output->allowFrames();
            $this->output->addHTML( $page->getCCDoneBox() );

            return $this->finish();
        }

        # 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;
        }

        $this->phpErrors = [];
        set_error_handler( [ $this, 'errorHandler' ] );
        try {
            session_name( 'mw_installer_session' );
            session_start();
        } 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' => $GLOBALS['wgVersion']
        ] ) );
    }

    public function showError( $msg, ...$params ) {
        if ( !( $msg instanceof Message ) ) {
            $msg = wfMessage(
                $msg,
                array_map( 'htmlspecialchars', $params )
            );
        }
        $text = $msg->useDatabase( false )->plain();
        $this->output->addHTML( $this->getErrorBox( $text ) );
    }

    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 = '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, $wgContLang, $wgLanguageCode;

        if ( $this->getSession( 'test' ) === null && !$this->request->wasPosted() ) {
            $wgLanguageCode = $this->getAcceptLanguage();
            $wgLang = Language::factory( $wgLanguageCode );
            RequestContext::getMain()->setLanguage( $wgLang );
            $this->setVar( 'wgLanguageCode', $wgLanguageCode );
            $this->setVar( '_UserLang', $wgLanguageCode );
        } else {
            $wgLanguageCode = $this->getVar( 'wgLanguageCode' );
        }
        $wgContLang = MediaWikiServices::getInstance()->getContentLanguage();
    }

    public function getAcceptLanguage() {
        global $wgLanguageCode, $wgRequest;

        $mwLanguages = Language::fetchLanguageNames( null, 'mwfile' );
        $headerLanguages = array_keys( $wgRequest->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\"><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></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-readme, 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-readme, 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 getErrorBox( $text ) {
        return $this->getInfoBox( $text, 'critical-32.png', 'config-error-box' );
    }

    public function getWarningBox( $text ) {
        return $this->getInfoBox( $text, 'warning-32.png', 'config-warning-box' );
    }

    public function getInfoBox( $text, $icon = false, $class = false ) {
        $text = $this->parse( $text, true );
        $icon = ( $icon == false ) ?
            'images/info-32.png' :
            'images/' . $icon;
        $alt = wfMessage( 'config-information' )->text();

        return Html::infoBox( $text, $icon, $alt, $class );
    }

    public function getHelpBox( $msg, ...$args ) {
        $args = array_map( 'htmlspecialchars', $args );
        $text = wfMessage( $msg, $args )->useDatabase( false )->plain();
        $html = $this->parse( $text, true );

        return "<div class=\"config-help-field-container\">\n" .
            "<span class=\"config-help-field-hint\" title=\"" .
            wfMessage( 'config-help-tooltip' )->escaped() . "\">" .
            wfMessage( 'config-help' )->escaped() . "</span>\n" .
            "<div class=\"config-help-field-data\">" . $html . "</div>\n" .
            "</div>\n";
    }

    public function showHelpBox( $msg, ...$params ) {
        $html = $this->getHelpBox( $msg, ...$params );
        $this->output->addHTML( $html );
    }

    public function showMessage( $msg, ...$params ) {
        $html = '<div class="config-message">' .
            $this->parse( wfMessage( $msg, $params )->useDatabase( false )->plain() ) .
            "</div>\n";
        $this->output->addHTML( $html );
    }

    public function showStatusMessage( Status $status ) {
        $errors = array_merge( $status->getErrorsArray(), $status->getWarningsArray() );
        foreach ( $errors as $error ) {
            $this->showMessage( ...$error );
        }
    }

    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" .
            Xml::tags( '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'],
            Xml::input(
                $params['controlName'],
                30, // intended to be overridden by CSS
                $params['value'],
                $params['attribs'] + [
                    'id' => $params['controlName'],
                    'class' => 'config-input-text',
                    'tabindex' => $this->nextTabIndex()
                ]
            ),
            $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'],
            Xml::textarea(
                $params['controlName'],
                $params['value'],
                30,
                5,
                $params['attribs'] + [
                    'id' => $params['controlName'],
                    '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() );

        return "<div class=\"config-input-check\">\n" .
            $params['help'] .
            Html::rawElement(
                'label',
                $params['labelAttribs'],
                Xml::check(
                    $params['controlName'],
                    $params['value'],
                    $params['attribs'] + [
                        'id' => $params['controlName'],
                        'tabindex' => $this->nextTabIndex(),
                    ]
                ) .
                $labelText . "\n"
                ) .
            "</div>\n";
    }

    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 = "<ul>\n";
        foreach ( $items as $value => $item ) {
            $s .= "<li>$item</li>\n";
        }
        $s .= "</ul>\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();

            $items[$value] =
                Xml::radio( $params['controlName'], $value, $checked, $itemAttribs ) .
                "\u{00A0}" .
                Xml::tags( 'label', [ 'for' => $id ], $this->parse(
                    isset( $params['itemLabels'] ) ?
                        wfMessage( $params['itemLabels'][$value] )->plain() :
                        wfMessage( $params['itemLabelPrefix'] . strtolower( $value ) )->plain()
                ) );
        }

        return $items;
    }

    public function showStatusBox( $status ) {
        if ( !$status->isGood() ) {
            $text = $status->getWikiText();

            if ( $status->isOK() ) {
                $box = $this->getWarningBox( $text );
            } else {
                $box = $this->getErrorBox( $text );
            }

            $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 ( 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;
    }

    protected function getDocUrl( $page ) {
        $query = [ 'page' => $page ];

        if ( in_array( $this->currentPageName, $this->pageSequence ) ) {
            $query['lastPage'] = $this->currentPageName;
        }

        return $this->getUrl( $query );
    }

    public function docLink( $linkText, $attribs, $parser ) {
        $url = $this->getDocUrl( $attribs['href'] );

        return Html::element( 'a', [ 'href' => $url ], $linkText );
    }

    public function downloadLinkHook( $text, $attribs, $parser ) {
        $anchor = Html::rawElement( 'a',
            [ 'href' => $this->getUrl( [ 'localsettings' => 1 ] ) ],
            wfMessage( 'config-download-localsettings' )->parse()
        );

        return Html::rawElement( 'div', [ 'class' => 'config-download-link' ], $anchor );
    }

    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();
    }

    public function envPrepPath() {
        parent::envPrepPath();
        // 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 );

            $this->setVar( 'wgScriptPath', "$scriptPath" );
            // Update variables set from Setup.php that are derived from wgScriptPath
            $this->setVar( 'wgScript', "$scriptPath/index.php" );
            $this->setVar( 'wgLoadScript', "$scriptPath/load.php" );
            $this->setVar( 'wgStylePath', "$scriptPath/skins" );
            $this->setVar( 'wgLocalStylePath', "$scriptPath/skins" );
            $this->setVar( 'wgExtensionAssetsPath', "$scriptPath/extensions" );
            $this->setVar( 'wgUploadPath', "$scriptPath/images" );
            $this->setVar( 'wgResourceBasePath', "$scriptPath" );
        }
    }

    protected function envGetDefaultServer() {
        return WebRequest::detectServer();
    }

    private function outputLS() {
        $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' );
        echo $this->output->getCSS();
    }

    public function getPhpErrors() {
        return $this->phpErrors;
    }

}