SpecialInterwiki.php

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<?php
 
namespace MediaWiki\Specials;
 
use LogicException;
use MediaWiki\Exception\PermissionsError;
use MediaWiki\Exception\ReadOnlyError;
use MediaWiki\Html\Html;
use MediaWiki\HTMLForm\HTMLForm;
use MediaWiki\Interwiki\InterwikiLookup;
use MediaWiki\Language\Language;
use MediaWiki\Language\LanguageNameUtils;
use MediaWiki\Logging\ManualLogEntry;
use MediaWiki\MainConfigNames;
use MediaWiki\Message\Message;
use MediaWiki\Output\OutputPage;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\Status\Status;
use MediaWiki\Title\Title;
use MediaWiki\Utils\UrlUtils;
use Wikimedia\Rdbms\IConnectionProvider;
 
class SpecialInterwiki extends SpecialPage {
    public function __construct(
        private readonly Language $contLang,
        private readonly InterwikiLookup $interwikiLookup,
        private readonly LanguageNameUtils $languageNameUtils,
        private readonly UrlUtils $urlUtils,
        private readonly IConnectionProvider $dbProvider,
    ) {
        parent::__construct( 'Interwiki' );
    }
 
    public function doesWrites() {
        return true;
    }
 
    public function getDescription() {
        return $this->msg( $this->canModify() ? 'interwiki' : 'interwiki-title-norights' );
    }
 
    public function getSubpagesForPrefixSearch() {
        // delete, edit both require the prefix parameter.
        return [ 'add' ];
    }
 
    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
 
        $out = $this->getOutput();
        $request = $this->getRequest();
 
        $out->addModuleStyles( 'mediawiki.special.interwiki' );
 
        $action = $par ?? $request->getRawVal( 'action' );
 
        if ( in_array( $action, [ 'add', 'edit', 'delete' ] ) && $this->canModify( $out ) ) {
            $this->showForm( $action );
        } else {
            $this->showList();
        }
    }
 
    private function canModify( $out = false ) {
        if ( !$this->getUser()->isAllowed( 'interwiki' ) ) {
            // Check permissions
            if ( $out ) {
                throw new PermissionsError( 'interwiki' );
            }
 
            return false;
        } elseif ( $this->getConfig()->get( MainConfigNames::InterwikiCache ) ) {
            // Editing the interwiki cache is not supported
            if ( $out ) {
                $out->addWikiMsg( 'interwiki-cached' );
            }
 
            return false;
        } else {
            if ( $out ) {
                $this->checkReadOnly();
            }
        }
 
        return true;
    }
 
    protected function showForm( $action ) {
        $formDescriptor = [];
        $hiddenFields = [
            'action' => $action,
        ];
 
        $status = Status::newGood();
        $request = $this->getRequest();
        $prefix = $request->getText( 'prefix' );
 
        switch ( $action ) {
            case 'add':
            case 'edit':
                $formDescriptor = [
                    'prefix' => [
                        'type' => 'text',
                        'label-message' => 'interwiki-prefix-label',
                        'name' => 'prefix',
                        'autofocus' => true,
                    ],
 
                    'local' => [
                        'type' => 'check',
                        'id' => 'mw-interwiki-local',
                        'label-message' => 'interwiki-local-label',
                        'name' => 'local',
                    ],
 
                    'trans' => [
                        'type' => 'check',
                        'id' => 'mw-interwiki-trans',
                        'label-message' => 'interwiki-trans-label',
                        'name' => 'trans',
                    ],
 
                    'url' => [
                        'type' => 'url',
                        'id' => 'mw-interwiki-url',
                        'label-message' => 'interwiki-url-label',
                        'maxlength' => 200,
                        'name' => 'url',
                        'size' => 60,
                    ],
 
                    'api' => [
                        'type' => 'url',
                        'id' => 'mw-interwiki-api',
                        'label-message' => 'interwiki-api-label',
                        'maxlength' => 200,
                        'name' => 'api',
                        'size' => 60,
                    ],
 
                    'reason' => [
                        'type' => 'text',
                        'id' => "mw-interwiki-{$action}reason",
                        'label-message' => 'interwiki_reasonfield',
                        'maxlength' => 200,
                        'name' => 'reason',
                        'size' => 60,
                    ],
                ];
 
                break;
            case 'delete':
                $formDescriptor = [
                    'prefix' => [
                        'type' => 'hidden',
                        'name' => 'prefix',
                        'default' => $prefix,
                    ],
 
                    'reason' => [
                        'type' => 'text',
                        'name' => 'reason',
                        'label-message' => 'interwiki_reasonfield',
                    ],
                ];
 
                break;
            default:
                throw new LogicException( "Unexpected action: {$action}" );
        }
 
        if ( $action === 'edit' || $action === 'delete' ) {
            $dbr = $this->dbProvider->getReplicaDatabase();
            $row = $dbr->newSelectQueryBuilder()
                ->select( '*' )
                ->from( 'interwiki' )
                ->where( [ 'iw_prefix' => $prefix ] )
                ->caller( __METHOD__ )->fetchRow();
 
            if ( $action === 'edit' ) {
                if ( !$row ) {
                    $status->fatal( 'interwiki_editerror', $prefix );
                } else {
                    $formDescriptor['prefix']['disabled'] = true;
                    $formDescriptor['prefix']['default'] = $prefix;
                    $hiddenFields['prefix'] = $prefix;
                    $formDescriptor['url']['default'] = $row->iw_url;
                    $formDescriptor['api']['default'] = $row->iw_api;
                    $formDescriptor['trans']['default'] = $row->iw_trans;
                    $formDescriptor['local']['default'] = $row->iw_local;
                }
            } else { // $action === 'delete'
                if ( !$row ) {
                    $status->fatal( 'interwiki_delfailed', $prefix );
                }
            }
        }
 
        if ( !$status->isOK() ) {
            $formDescriptor = [];
        }
 
        $htmlForm = HTMLForm::factory( 'ooui', $formDescriptor, $this->getContext() );
        $htmlForm
            ->addHiddenFields( $hiddenFields )
            ->setSubmitCallback( $this->onSubmit( ... ) );
 
        if ( $status->isOK() ) {
            if ( $action === 'delete' ) {
                $htmlForm->setSubmitDestructive();
            }
 
            $htmlForm->setSubmitTextMsg( $action !== 'add' ? $action : 'interwiki_addbutton' )
                ->setPreHtml( $this->msg( $action !== 'delete' ? "interwiki_{$action}intro" :
                    'interwiki_deleting', $prefix )->escaped() )
                ->show();
        } else {
            $htmlForm->suppressDefaultSubmit()
                ->prepareForm()
                ->displayForm( $status );
        }
 
        $this->getOutput()->addBacklinkSubtitle( $this->getPageTitle() );
    }
 
    private function onSubmit( array $data ) {
        $status = Status::newGood();
        $request = $this->getRequest();
        $config = $this->getConfig();
        $prefix = $data['prefix'];
        $do = $request->getRawVal( 'action' );
        // Show an error if the prefix is invalid (only when adding one).
        // Invalid characters for a title should also be invalid for a prefix.
        // Whitespace, ':', '&' and '=' are invalid, too.
        // (Bug 30599).
        $validPrefixChars = preg_replace( '/[ :&=]/', '', Title::legalChars() );
        if ( $do === 'add' && preg_match( "/\s|[^$validPrefixChars]/", $prefix ) ) {
            $status->fatal( 'interwiki-badprefix', htmlspecialchars( $prefix ) );
            return $status;
        }
        $virtualDomainsMapping = $this->getConfig()->get( MainConfigNames::VirtualDomainsMapping ) ?? [];
        // Disallow adding local interlanguage definitions if using global
        if (
            $do === 'add'
            && $this->isLanguagePrefix( $prefix )
            && isset( $virtualDomainsMapping['virtual-interwiki-interlanguage'] )
        ) {
            $status->fatal( 'interwiki-cannotaddlocallanguage', htmlspecialchars( $prefix ) );
            return $status;
        }
        $reason = $data['reason'];
        $selfTitle = $this->getPageTitle();
        $dbw = $this->dbProvider->getPrimaryDatabase();
        switch ( $do ) {
            case 'delete':
                $dbw->newDeleteQueryBuilder()
                    ->deleteFrom( 'interwiki' )
                    ->where( [ 'iw_prefix' => $prefix ] )
                    ->caller( __METHOD__ )->execute();
 
                if ( $dbw->affectedRows() === 0 ) {
                    $status->fatal( 'interwiki_delfailed', $prefix );
                } else {
                    $this->getOutput()->addWikiMsg( 'interwiki_deleted', $prefix );
                    $log = new ManualLogEntry( 'interwiki', 'iw_delete' );
                    $log->setTarget( $selfTitle );
                    $log->setComment( $reason );
                    $log->setParameters( [
                        '4::prefix' => $prefix
                    ] );
                    $log->setPerformer( $this->getUser() );
                    $log->insert();
                    $this->interwikiLookup->invalidateCache( $prefix );
                }
                break;
            case 'add':
                $prefix = $this->contLang->lc( $prefix );
                // Fall through
            case 'edit':
                // T374771: Trim the URL and API URLs to reduce confusion when
                // the URLs are accidentally provided with extra whitespace
                $theurl = trim( $data['url'] );
                $api = trim( $data['api'] ?? '' );
                $local = $data['local'] ? 1 : 0;
                $trans = $data['trans'] ? 1 : 0;
                $row = [
                    'iw_prefix' => $prefix,
                    'iw_url' => $theurl,
                    'iw_api' => $api,
                    'iw_wikiid' => '',
                    'iw_local' => $local,
                    'iw_trans' => $trans
                ];
 
                if ( $prefix === '' || $theurl === '' ) {
                    $status->fatal( 'interwiki-submit-empty' );
                    break;
                }
 
                // Simple URL validation: check that the protocol is one of
                // the supported protocols for this wiki.
                // (T32600)
                if ( !$this->urlUtils->parse( $theurl ) ) {
                    $status->fatal( 'interwiki-submit-invalidurl' );
                    break;
                }
 
                if ( $do === 'add' ) {
                    $dbw->newInsertQueryBuilder()
                        ->insertInto( 'interwiki' )
                        ->row( $row )
                        ->ignore()
                        ->caller( __METHOD__ )->execute();
                } else { // $do === 'edit'
                    $dbw->newUpdateQueryBuilder()
                        ->update( 'interwiki' )
                        ->set( $row )
                        ->where( [ 'iw_prefix' => $prefix ] )
                        ->ignore()
                        ->caller( __METHOD__ )->execute();
                }
 
                // used here: interwiki_addfailed, interwiki_added, interwiki_edited
                if ( $dbw->affectedRows() === 0 ) {
                    $status->fatal( "interwiki_{$do}failed", $prefix );
                } else {
                    $this->getOutput()->addWikiMsg( "interwiki_{$do}ed", $prefix );
                    $log = new ManualLogEntry( 'interwiki', 'iw_' . $do );
                    $log->setTarget( $selfTitle );
                    $log->setComment( $reason );
                    $log->setParameters( [
                        '4::prefix' => $prefix,
                        '5::url' => $theurl,
                        '6::trans' => $trans,
                        '7::local' => $local
                    ] );
                    $log->setPerformer( $this->getUser() );
                    $log->insert();
                    $this->interwikiLookup->invalidateCache( $prefix );
                }
                break;
            default:
                throw new LogicException( "Unexpected action: {$do}" );
        }
 
        return $status;
    }
 
    private function isLanguagePrefix( $prefix ) {
        return $this->getConfig()->get( MainConfigNames::InterwikiMagic )
            && $this->languageNameUtils->getLanguageName( $prefix );
    }
 
    protected function showList() {
        $canModify = $this->canModify();
 
        // Build lists
        $iwPrefixes = $this->interwikiLookup->getAllPrefixes( null );
        $iwGlobalPrefixes = [];
        $iwGlobalLanguagePrefixes = [];
        $virtualDomainsMapping = $this->getConfig()->get( MainConfigNames::VirtualDomainsMapping ) ?? [];
        if ( isset( $virtualDomainsMapping['virtual-interwiki'] ) ) {
            // Fetch list from global table
            $dbrCentralDB = $this->dbProvider->getReplicaDatabase( 'virtual-interwiki' );
            $res = $dbrCentralDB->newSelectQueryBuilder()
                ->select( '*' )
                ->from( 'interwiki' )
                ->caller( __METHOD__ )->fetchResultSet();
            $retval = [];
            foreach ( $res as $row ) {
                $row = (array)$row;
                if ( !$this->isLanguagePrefix( $row['iw_prefix'] ) ) {
                    $retval[] = $row;
                }
            }
            $iwGlobalPrefixes = $retval;
        }
 
        // Almost the same loop as above, but for global inter*language* links, whereas the above is for
        // global inter*wiki* links
        $usingGlobalLanguages = isset( $virtualDomainsMapping['virtual-interwiki-interlanguage'] );
        if ( $usingGlobalLanguages ) {
            // Fetch list from global table
            $dbrCentralLangDB = $this->dbProvider->getReplicaDatabase( 'virtual-interwiki-interlanguage' );
            $res = $dbrCentralLangDB->newSelectQueryBuilder()
                ->select( '*' )
                ->from( 'interwiki' )
                ->caller( __METHOD__ )->fetchResultSet();
            $retval2 = [];
            foreach ( $res as $row ) {
                $row = (array)$row;
                // Note that the above DB query explicitly *excludes* interlang ones
                // (which makes sense), whereas here we _only_ care about interlang ones!
                if ( $this->isLanguagePrefix( $row['iw_prefix'] ) ) {
                    $retval2[] = $row;
                }
            }
            $iwGlobalLanguagePrefixes = $retval2;
        }
 
        // Split out language links
        $iwLocalPrefixes = [];
        $iwLanguagePrefixes = [];
        foreach ( $iwPrefixes as $iwPrefix ) {
            if ( $this->isLanguagePrefix( $iwPrefix['iw_prefix'] ) ) {
                $iwLanguagePrefixes[] = $iwPrefix;
            } else {
                $iwLocalPrefixes[] = $iwPrefix;
            }
        }
 
        // If using global interlanguage links, just ditch the data coming from the
        // local table and overwrite it with the global data
        if ( $usingGlobalLanguages ) {
            unset( $iwLanguagePrefixes );
            $iwLanguagePrefixes = $iwGlobalLanguagePrefixes;
        }
 
        // Page intro content
        $this->getOutput()->addWikiMsg( 'interwiki_intro' );
 
        // Add 'view log' link
        $logLink = $this->getLinkRenderer()->makeLink(
            SpecialPage::getTitleFor( 'Log', 'interwiki' ),
            $this->msg( 'interwiki-logtext' )->text()
        );
        $this->getOutput()->addHTML(
            Html::rawElement( 'p', [ 'class' => 'mw-interwiki-log' ], $logLink )
        );
 
        // Add 'add' link
        if ( $canModify ) {
            if ( count( $iwGlobalPrefixes ) !== 0 ) {
                if ( $usingGlobalLanguages ) {
                    $addtext = 'interwiki-addtext-local-nolang';
                } else {
                    $addtext = 'interwiki-addtext-local';
                }
            } else {
                if ( $usingGlobalLanguages ) {
                    $addtext = 'interwiki-addtext-nolang';
                } else {
                    $addtext = 'interwiki_addtext';
                }
            }
            $addtext = $this->msg( $addtext )->text();
            $addlink = $this->getLinkRenderer()->makeKnownLink(
                $this->getPageTitle( 'add' ), $addtext );
            $this->getOutput()->addHTML(
                Html::rawElement( 'p', [ 'class' => 'mw-interwiki-addlink' ], $addlink )
            );
        }
 
        $this->getOutput()->addWikiMsg( 'interwiki-legend' );
 
        if ( $iwPrefixes === [] && $iwGlobalPrefixes === [] ) {
            // If the interwiki table(s) are empty, display an error message
            $this->error( 'interwiki_error' );
            return;
        }
 
        // Add the global table
        if ( count( $iwGlobalPrefixes ) !== 0 ) {
            $this->getOutput()->addHTML(
                Html::rawElement(
                    'h2',
                    [ 'class' => 'interwikitable-global' ],
                    $this->msg( 'interwiki-global-links' )->parse()
                )
            );
            $this->getOutput()->addWikiMsg( 'interwiki-global-description' );
 
            // $canModify is false here because this is just a display of remote data
            $this->makeTable( false, $iwGlobalPrefixes );
        }
 
        // Add the local table
        if ( count( $iwLocalPrefixes ) !== 0 ) {
            if ( count( $iwGlobalPrefixes ) !== 0 ) {
                $this->getOutput()->addHTML(
                    Html::rawElement(
                        'h2',
                        [ 'class' => 'interwikitable-local' ],
                        $this->msg( 'interwiki-local-links' )->parse()
                    )
                );
                $this->getOutput()->addWikiMsg( 'interwiki-local-description' );
            } else {
                $this->getOutput()->addHTML(
                    Html::rawElement(
                        'h2',
                        [ 'class' => 'interwikitable-local' ],
                        $this->msg( 'interwiki-links' )->parse()
                    )
                );
                $this->getOutput()->addWikiMsg( 'interwiki-description' );
            }
            $this->makeTable( $canModify, $iwLocalPrefixes );
        }
 
        // Add the language table
        if ( count( $iwLanguagePrefixes ) !== 0 ) {
            if ( $usingGlobalLanguages ) {
                $header = 'interwiki-global-language-links';
                $description = 'interwiki-global-language-description';
            } else {
                $header = 'interwiki-language-links';
                $description = 'interwiki-language-description';
            }
 
            $this->getOutput()->addHTML(
                Html::rawElement(
                    'h2',
                    [ 'class' => 'interwikitable-language' ],
                    $this->msg( $header )->parse()
                )
            );
            $this->getOutput()->addWikiMsg( $description );
 
            // When using global interlanguage links, don't allow them to be modified
            // except on the source wiki
            $canModify = ( $usingGlobalLanguages ? false : $canModify );
            $this->makeTable( $canModify, $iwLanguagePrefixes );
        }
    }
 
    protected function makeTable( bool $canModify, array $iwPrefixes ) {
        // Output the existing Interwiki prefixes table header
        $out = Html::openElement(
            'table',
            [ 'class' => 'mw-interwikitable wikitable sortable' ]
        ) . "\n";
        $out .= Html::openElement( 'thead' ) .
            Html::openElement( 'tr', [ 'class' => 'interwikitable-header' ] ) .
            Html::element( 'th', [], $this->msg( 'interwiki_prefix' )->text() ) .
            Html::element( 'th', [], $this->msg( 'interwiki_url' )->text() ) .
            Html::element( 'th', [], $this->msg( 'interwiki_local' )->text() ) .
            Html::element( 'th', [], $this->msg( 'interwiki_trans' )->text() ) .
            ( $canModify ?
                Html::element(
                    'th',
                    [ 'class' => 'unsortable' ],
                    $this->msg( 'interwiki_edit' )->text()
                ) :
                ''
            );
        $out .= Html::closeElement( 'tr' ) .
            Html::closeElement( 'thead' ) . "\n" .
            Html::openElement( 'tbody' );
 
        $selfTitle = $this->getPageTitle();
 
        // Output the existing Interwiki prefixes table rows
        foreach ( $iwPrefixes as $iwPrefix ) {
            $out .= Html::openElement( 'tr', [ 'class' => 'mw-interwikitable-row' ] );
            $out .= Html::element( 'td', [ 'class' => 'mw-interwikitable-prefix' ],
                $iwPrefix['iw_prefix'] );
            $out .= Html::element(
                'td',
                [ 'class' => 'mw-interwikitable-url' ],
                $iwPrefix['iw_url']
            );
            $attribs = [ 'class' => 'mw-interwikitable-local' ];
            // Green background for cells with "yes".
            if ( isset( $iwPrefix['iw_local'] ) && $iwPrefix['iw_local'] ) {
                $attribs['class'] .= ' mw-interwikitable-local-yes';
            }
            // The messages interwiki_0 and interwiki_1 are used here.
            $contents = isset( $iwPrefix['iw_local'] ) ?
                $this->msg( 'interwiki_' . $iwPrefix['iw_local'] )->text() :
                '-';
            $out .= Html::element( 'td', $attribs, $contents );
            $attribs = [ 'class' => 'mw-interwikitable-trans' ];
            // Green background for cells with "yes".
            if ( isset( $iwPrefix['iw_trans'] ) && $iwPrefix['iw_trans'] ) {
                $attribs['class'] .= ' mw-interwikitable-trans-yes';
            }
            // The messages interwiki_0 and interwiki_1 are used here.
            $contents = isset( $iwPrefix['iw_trans'] ) ?
                $this->msg( 'interwiki_' . $iwPrefix['iw_trans'] )->text() :
                '-';
            $out .= Html::element( 'td', $attribs, $contents );
 
            // Additional column when the interwiki table can be modified.
            if ( $canModify ) {
                $out .= Html::rawElement( 'td', [ 'class' => 'mw-interwikitable-modify' ],
                    $this->getLinkRenderer()->makeKnownLink(
                        $selfTitle,
                        $this->msg( 'edit' )->text(),
                        [],
                        [ 'action' => 'edit', 'prefix' => $iwPrefix['iw_prefix'] ]
                    ) .
                    $this->msg( 'comma-separator' )->escaped() .
                    $this->getLinkRenderer()->makeKnownLink(
                        $selfTitle,
                        $this->msg( 'delete' )->text(),
                        [],
                        [ 'action' => 'delete', 'prefix' => $iwPrefix['iw_prefix'] ]
                    )
                );
            }
            $out .= Html::closeElement( 'tr' ) . "\n";
        }
        $out .= Html::closeElement( 'tbody' ) .
            Html::closeElement( 'table' );
 
        $this->getOutput()->addHTML( $out );
        $this->getOutput()->addModuleStyles( 'jquery.tablesorter.styles' );
        $this->getOutput()->addModules( 'jquery.tablesorter' );
    }
 
    protected function error( ...$args ) {
        $this->getOutput()->wrapWikiMsg( "<p class='error'>$1</p>", $args );
    }
 
    protected function getGroupName() {
        return 'wiki';
    }
}