Merge "Special:Upload should not crash on failing previews"

[mediawiki.git] / includes / specials / SpecialPageLanguage.php

<?php
/**
 * Implements Special:PageLanguage
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 * @author Kunal Grover
 * @since 1.24
 */

/**
 * Special page for changing the content language of a page
 *
 * @ingroup SpecialPage
 */
class SpecialPageLanguage extends FormSpecialPage {
        /**
         * @var string URL to go to if language change successful
         */
        private $goToUrl;

        public function __construct() {
                parent::__construct( 'PageLanguage', 'pagelang' );
        }

        public function doesWrites() {
                return true;
        }

        protected function preText() {
                $this->getOutput()->addModules( 'mediawiki.special.pageLanguage' );
        }

        protected function getFormFields() {
                // Get default from the subpage of Special page
                $defaultName = $this->par;

                $page = [];
                $page['pagename'] = [
                        'type' => 'title',
                        'label-message' => 'pagelang-name',
                        'default' => $defaultName,
                        'autofocus' => $defaultName === null,
                        'exists' => true,
                ];

                // Options for whether to use the default language or select language
                $selectoptions = [
                        (string)$this->msg( 'pagelang-use-default' )->escaped() => 1,
                        (string)$this->msg( 'pagelang-select-lang' )->escaped() => 2,
                ];
                $page['selectoptions'] = [
                        'id' => 'mw-pl-options',
                        'type' => 'radio',
                        'options' => $selectoptions,
                        'default' => 1
                ];

                // Building a language selector
                $userLang = $this->getLanguage()->getCode();
                $languages = Language::fetchLanguageNames( $userLang, 'mwfile' );
                ksort( $languages );
                $options = [];
                foreach ( $languages as $code => $name ) {
                        $options["$code - $name"] = $code;
                }

                $page['language'] = [
                        'id' => 'mw-pl-languageselector',
                        'cssclass' => 'mw-languageselector',
                        'type' => 'select',
                        'options' => $options,
                        'label-message' => 'pagelang-language',
                        'default' => $this->getConfig()->get( 'LanguageCode' ),
                ];

                // Allow user to enter a comment explaining the change
                $page['reason'] = [
                        'type' => 'text',
                        'label-message' => 'pagelang-reason'
                ];

                return $page;
        }

        protected function postText() {
                if ( $this->par ) {
                        return $this->showLogFragment( $this->par );
                }
                return '';
        }

        protected function getDisplayFormat() {
                return 'ooui';
        }

        public function alterForm( HTMLForm $form ) {
                Hooks::run( 'LanguageSelector', [ $this->getOutput(), 'mw-languageselector' ] );
                $form->setSubmitTextMsg( 'pagelang-submit' );
        }

        /**
         *
         * @param array $data
         * @return Status
         */
        public function onSubmit( array $data ) {
                $pageName = $data['pagename'];

                // Check if user wants to use default language
                if ( $data['selectoptions'] == 1 ) {
                        $newLanguage = 'default';
                } else {
                        $newLanguage = $data['language'];
                }

                try {
                        $title = Title::newFromTextThrow( $pageName );
                } catch ( MalformedTitleException $ex ) {
                        return Status::newFatal( $ex->getMessageObject() );
                }

                // Url to redirect to after the operation
                $this->goToUrl = $title->getFullURL(
                        $title->isRedirect() ? [ 'redirect' => 'no' ] : []
                );

                return self::changePageLanguage(
                        $this->getContext(),
                        $title,
                        $newLanguage,
                        $data['reason'] === null ? '' : $data['reason']
                );
        }

        /**
         * @param IContextSource $context
         * @param Title $title
         * @param string $newLanguage Language code
         * @param string $reason Reason for the change
         * @param array $tags Change tags to apply to the log entry
         * @return Status
         */
        public static function changePageLanguage( IContextSource $context, Title $title,
                $newLanguage, $reason, array $tags = [] ) {
                // Get the default language for the wiki
                $defLang = $context->getConfig()->get( 'LanguageCode' );

                $pageId = $title->getArticleID();

                // Check if article exists
                if ( !$pageId ) {
                        return Status::newFatal(
                                'pagelang-nonexistent-page',
                                wfEscapeWikiText( $title->getPrefixedText() )
                        );
                }

                // Load the page language from DB
                $dbw = wfGetDB( DB_MASTER );
                $oldLanguage = $dbw->selectField(
                        'page',
                        'page_lang',
                        [ 'page_id' => $pageId ],
                        __METHOD__
                );

                // Check if user wants to use the default language
                if ( $newLanguage === 'default' ) {
                        $newLanguage = null;
                }

                // No change in language
                if ( $newLanguage === $oldLanguage ) {
                        // Check if old language does not exist
                        if ( !$oldLanguage ) {
                                return Status::newFatal( ApiMessage::create(
                                        [
                                                'pagelang-unchanged-language-default',
                                                wfEscapeWikiText( $title->getPrefixedText() )
                                        ],
                                        'pagelang-unchanged-language'
                                ) );
                        }
                        return Status::newFatal(
                                'pagelang-unchanged-language',
                                wfEscapeWikiText( $title->getPrefixedText() ),
                                $oldLanguage
                        );
                }

                // Hardcoded [def] if the language is set to null
                $logOld = $oldLanguage ? $oldLanguage : $defLang . '[def]';
                $logNew = $newLanguage ? $newLanguage : $defLang . '[def]';

                // Writing new page language to database
                $dbw->update(
                        'page',
                        [ 'page_lang' => $newLanguage ],
                        [
                                'page_id' => $pageId,
                                'page_lang' => $oldLanguage
                        ],
                        __METHOD__
                );

                if ( !$dbw->affectedRows() ) {
                        return Status::newFatal( 'pagelang-db-failed' );
                }

                // Logging change of language
                $logParams = [
                        '4::oldlanguage' => $logOld,
                        '5::newlanguage' => $logNew
                ];
                $entry = new ManualLogEntry( 'pagelang', 'pagelang' );
                $entry->setPerformer( $context->getUser() );
                $entry->setTarget( $title );
                $entry->setParameters( $logParams );
                $entry->setComment( $reason );
                $entry->setTags( $tags );

                $logid = $entry->insert();
                $entry->publish( $logid );

                // Force re-render so that language-based content (parser functions etc.) gets updated
                $title->invalidateCache();

                return Status::newGood( (object)[
                        'oldLanguage' => $logOld,
                        'newLanguage' => $logNew,
                        'logId' => $logid,
                ] );
        }

        public function onSuccess() {
                // Success causes a redirect
                $this->getOutput()->redirect( $this->goToUrl );
        }

        function showLogFragment( $title ) {
                $moveLogPage = new LogPage( 'pagelang' );
                $out1 = Xml::element( 'h2', null, $moveLogPage->getName()->text() );
                $out2 = '';
                LogEventsList::showLogExtract( $out2, 'pagelang', $title );
                return $out1 . $out2;
        }

        /**
         * Return an array of subpages beginning with $search that this special page will accept.
         *
         * @param string $search Prefix to search for
         * @param int $limit Maximum number of results to return (usually 10)
         * @param int $offset Number of results to skip (usually 0)
         * @return string[] Matching subpages
         */
        public function prefixSearchSubpages( $search, $limit, $offset ) {
                return $this->prefixSearchString( $search, $limit, $offset );
        }

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