SpecialUpload.php

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<?php
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\User\UserOptionsLookup;
use MediaWiki\Watchlist\WatchlistManager;
 
class SpecialUpload extends SpecialPage {
 
    private $localRepo;
 
    private $userOptionsLookup;
 
    private $nsInfo;
 
    private $watchlistManager;
 
    public function __construct(
        RepoGroup $repoGroup = null,
        UserOptionsLookup $userOptionsLookup = null,
        NamespaceInfo $nsInfo = null,
        WatchlistManager $watchlistManager = null
    ) {
        parent::__construct( 'Upload', 'upload' );
        // This class is extended and therefor fallback to global state - T265300
        $services = MediaWikiServices::getInstance();
        $repoGroup = $repoGroup ?? $services->getRepoGroup();
        $this->localRepo = $repoGroup->getLocalRepo();
        $this->userOptionsLookup = $userOptionsLookup ?? $services->getUserOptionsLookup();
        $this->nsInfo = $nsInfo ?? $services->getNamespaceInfo();
        $this->watchlistManager = $watchlistManager ?? $services->getWatchlistManager();
    }
 
    public function doesWrites() {
        return true;
    }
 
    public $mRequest;
    public $mSourceType;
 
    public $mUpload;
 
    public $mLocalFile;
    public $mUploadClicked;
 
    public $mDesiredDestName;
    public $mComment;
    public $mLicense;
 
    public $mIgnoreWarning;
    public $mWatchthis;
    public $mCopyrightStatus;
    public $mCopyrightSource;
 
    public $mDestWarningAck;
 
    public $mForReUpload;
 
    public $mCancelUpload;
    public $mTokenOk;
 
    public $mUploadSuccessful = false;
 
    public $uploadFormTextTop;
    public $uploadFormTextAfterSummary;
 
    protected function loadRequest() {
        $this->mRequest = $request = $this->getRequest();
        $this->mSourceType = $request->getVal( 'wpSourceType', 'file' );
        $this->mUpload = UploadBase::createFromRequest( $request );
        $this->mUploadClicked = $request->wasPosted()
            && ( $request->getCheck( 'wpUpload' )
                || $request->getCheck( 'wpUploadIgnoreWarning' ) );
 
        // Guess the desired name from the filename if not provided
        $this->mDesiredDestName = $request->getText( 'wpDestFile' );
        if ( !$this->mDesiredDestName && $request->getFileName( 'wpUploadFile' ) !== null ) {
            $this->mDesiredDestName = $request->getFileName( 'wpUploadFile' );
        }
        $this->mLicense = $request->getText( 'wpLicense' );
 
        $this->mDestWarningAck = $request->getText( 'wpDestFileWarningAck' );
        $this->mIgnoreWarning = $request->getCheck( 'wpIgnoreWarning' )
            || $request->getCheck( 'wpUploadIgnoreWarning' );
        $this->mWatchthis = $request->getBool( 'wpWatchthis' ) && $this->getUser()->isRegistered();
        $this->mCopyrightStatus = $request->getText( 'wpUploadCopyStatus' );
        $this->mCopyrightSource = $request->getText( 'wpUploadSource' );
 
        $this->mForReUpload = $request->getBool( 'wpForReUpload' ); // updating a file
 
        $commentDefault = '';
        $commentMsg = $this->msg( 'upload-default-description' )->inContentLanguage();
        if ( !$this->mForReUpload && !$commentMsg->isDisabled() ) {
            $commentDefault = $commentMsg->plain();
        }
        $this->mComment = $request->getText( 'wpUploadDescription', $commentDefault );
 
        $this->mCancelUpload = $request->getCheck( 'wpCancelUpload' )
            || $request->getCheck( 'wpReUpload' ); // b/w compat
 
        // If it was posted check for the token (no remote POST'ing with user credentials)
        $token = $request->getVal( 'wpEditToken' );
        $this->mTokenOk = $this->getUser()->matchEditToken( $token );
 
        $this->uploadFormTextTop = '';
        $this->uploadFormTextAfterSummary = '';
    }
 
    public function userCanExecute( User $user ) {
        return UploadBase::isEnabled() && parent::userCanExecute( $user );
    }
 
    public function execute( $par ) {
        $this->useTransactionalTimeLimit();
 
        $this->setHeaders();
        $this->outputHeader();
 
        # Check uploading enabled
        if ( !UploadBase::isEnabled() ) {
            throw new ErrorPageError( 'uploaddisabled', 'uploaddisabledtext' );
        }
 
        $this->addHelpLink( 'Help:Managing files' );
 
        # Check permissions
        $user = $this->getUser();
        $permissionRequired = UploadBase::isAllowed( $user );
        if ( $permissionRequired !== true ) {
            throw new PermissionsError( $permissionRequired );
        }
 
        # Check blocks
        if ( $user->isBlockedFromUpload() ) {
            throw new UserBlockedError(
                // @phan-suppress-next-line PhanTypeMismatchArgumentNullable Block is checked and not null
                $user->getBlock(),
                $user,
                $this->getLanguage(),
                $this->getRequest()->getIP()
            );
        }
 
        // Global blocks
        if ( $user->isBlockedGlobally() ) {
            throw new UserBlockedError(
                $user->getGlobalBlock(),
                $user,
                $this->getLanguage(),
                $this->getRequest()->getIP()
            );
        }
 
        # Check whether we actually want to allow changing stuff
        $this->checkReadOnly();
 
        $this->loadRequest();
 
        # Unsave the temporary file in case this was a cancelled upload
        if ( $this->mCancelUpload && !$this->unsaveUploadedFile() ) {
            # Something went wrong, so unsaveUploadedFile showed a warning
            return;
        }
 
        # Process upload or show a form
        if (
            $this->mTokenOk && !$this->mCancelUpload &&
            ( $this->mUpload && $this->mUploadClicked )
        ) {
            $this->processUpload();
        } else {
            # Backwards compatibility hook
            if ( !$this->getHookRunner()->onUploadForm_initial( $this ) ) {
                wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 
                return;
            }
            $this->showUploadForm( $this->getUploadForm() );
        }
 
        # Cleanup
        if ( $this->mUpload ) {
            $this->mUpload->cleanupTempFile();
        }
    }
 
    protected function showUploadForm( $form ) {
        # Add links if file was previously deleted
        if ( $this->mDesiredDestName ) {
            $this->showViewDeletedLinks();
        }
 
        if ( $form instanceof HTMLForm ) {
            $form->show();
        } else {
            $this->getOutput()->addHTML( $form );
        }
    }
 
    protected function getUploadForm( $message = '', $sessionKey = '', $hideIgnoreWarning = false ) {
        # Initialize form
        $form = new UploadForm(
            [
                'watch' => $this->getWatchCheck(),
                'forreupload' => $this->mForReUpload,
                'sessionkey' => $sessionKey,
                'hideignorewarning' => $hideIgnoreWarning,
                'destwarningack' => (bool)$this->mDestWarningAck,
 
                'description' => $this->mComment,
                'texttop' => $this->uploadFormTextTop,
                'textaftersummary' => $this->uploadFormTextAfterSummary,
                'destfile' => $this->mDesiredDestName,
            ],
            $this->getContext(),
            $this->getLinkRenderer(),
            $this->localRepo,
            $this->getContentLanguage(),
            $this->nsInfo
        );
        $form->setTitle( $this->getPageTitle() ); // Remove subpage
 
        # Check the token, but only if necessary
        if (
            !$this->mTokenOk && !$this->mCancelUpload &&
            ( $this->mUpload && $this->mUploadClicked )
        ) {
            $form->addPreText( $this->msg( 'session_fail_preview' )->parse() );
        }
 
        # Give a notice if the user is uploading a file that has been deleted or moved
        # Note that this is independent from the message 'filewasdeleted'
        $desiredTitleObj = Title::makeTitleSafe( NS_FILE, $this->mDesiredDestName );
        $delNotice = ''; // empty by default
        if ( $desiredTitleObj instanceof Title && !$desiredTitleObj->exists() ) {
            LogEventsList::showLogExtract( $delNotice, [ 'delete', 'move' ],
                $desiredTitleObj,
                '', [ 'lim' => 10,
                    'conds' => [ 'log_action != ' . $this->localRepo->getReplicaDB()->addQuotes( 'revision' ) ],
                    'showIfEmpty' => false,
                    'msgKey' => [ 'upload-recreate-warning' ] ]
            );
        }
        $form->addPreText( $delNotice );
 
        # Add text to form
        $form->addPreText( '<div id="uploadtext">' .
            $this->msg( 'uploadtext', [ $this->mDesiredDestName ] )->parseAsBlock() .
            '</div>' );
        # Add upload error message
        $form->addPreText( $message );
 
        # Add footer to form
        $uploadFooter = $this->msg( 'uploadfooter' );
        if ( !$uploadFooter->isDisabled() ) {
            $form->addPostText( '<div id="mw-upload-footer-message">'
                . $uploadFooter->parseAsBlock() . "</div>\n" );
        }
 
        return $form;
    }
 
    protected function showViewDeletedLinks() {
        $title = Title::makeTitleSafe( NS_FILE, $this->mDesiredDestName );
        $user = $this->getUser();
        // Show a subtitle link to deleted revisions (to sysops et al only)
        if ( $title instanceof Title ) {
            $count = $title->getDeletedEditsCount();
            if ( $count > 0 && $this->getAuthority()->isAllowed( 'deletedhistory' ) ) {
                $restorelink = $this->getLinkRenderer()->makeKnownLink(
                    SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedText() ),
                    $this->msg( 'restorelink' )->numParams( $count )->text()
                );
                $link = $this->msg(
                    $this->getAuthority()->isAllowed( 'delete' ) ? 'thisisdeleted' : 'viewdeleted'
                )->rawParams( $restorelink )->parseAsBlock();
                $this->getOutput()->addHTML(
                    Html::rawElement(
                        'div',
                        [ 'id' => 'contentSub2' ],
                        $link
                    )
                );
            }
        }
    }
 
    protected function showRecoverableUploadError( $message ) {
        $stashStatus = $this->mUpload->tryStashFile( $this->getUser() );
        if ( $stashStatus->isGood() ) {
            $sessionKey = $stashStatus->getValue()->getFileKey();
            $uploadWarning = 'upload-tryagain';
        } else {
            $sessionKey = null;
            $uploadWarning = 'upload-tryagain-nostash';
        }
        $message = '<h2>' . $this->msg( 'uploaderror' )->escaped() . '</h2>' .
            Html::errorBox( $message );
 
        $form = $this->getUploadForm( $message, $sessionKey );
        $form->setSubmitText( $this->msg( $uploadWarning )->escaped() );
        $this->showUploadForm( $form );
    }
 
    protected function showUploadWarning( $warnings ) {
        # If there are no warnings, or warnings we can ignore, return early.
        # mDestWarningAck is set when some javascript has shown the warning
        # to the user. mForReUpload is set when the user clicks the "upload a
        # new version" link.
        if ( !$warnings || ( count( $warnings ) == 1
            && isset( $warnings['exists'] )
            && ( $this->mDestWarningAck || $this->mForReUpload ) )
        ) {
            return false;
        }
 
        $stashStatus = $this->mUpload->tryStashFile( $this->getUser() );
        if ( $stashStatus->isGood() ) {
            $sessionKey = $stashStatus->getValue()->getFileKey();
            $uploadWarning = 'uploadwarning-text';
        } else {
            $sessionKey = null;
            $uploadWarning = 'uploadwarning-text-nostash';
        }
 
        // Add styles for the warning, reused from the live preview
        $this->getOutput()->addModuleStyles( 'mediawiki.special' );
 
        $linkRenderer = $this->getLinkRenderer();
        $warningHtml = '<h2>' . $this->msg( 'uploadwarning' )->escaped() . "</h2>\n"
            . '<div class="mw-destfile-warning"><ul>';
        foreach ( $warnings as $warning => $args ) {
            if ( $warning == 'badfilename' ) {
                $this->mDesiredDestName = Title::makeTitle( NS_FILE, $args )->getText();
            }
            if ( $warning == 'exists' ) {
                $msg = "\t<li>" . self::getExistsWarning( $args ) . "</li>\n";
            } elseif ( $warning == 'no-change' ) {
                $file = $args;
                $filename = $file->getTitle()->getPrefixedText();
                $msg = "\t<li>" . $this->msg( 'fileexists-no-change', $filename )->parse() . "</li>\n";
            } elseif ( $warning == 'duplicate-version' ) {
                $file = $args[0];
                $count = count( $args );
                $filename = $file->getTitle()->getPrefixedText();
                $message = $this->msg( 'fileexists-duplicate-version' )
                    ->params( $filename )
                    ->numParams( $count );
                $msg = "\t<li>" . $message->parse() . "</li>\n";
            } elseif ( $warning == 'was-deleted' ) {
                # If the file existed before and was deleted, warn the user of this
                $ltitle = SpecialPage::getTitleFor( 'Log' );
                $llink = $linkRenderer->makeKnownLink(
                    $ltitle,
                    $this->msg( 'deletionlog' )->text(),
                    [],
                    [
                        'type' => 'delete',
                        'page' => Title::makeTitle( NS_FILE, $args )->getPrefixedText(),
                    ]
                );
                $msg = "\t<li>" . $this->msg( 'filewasdeleted' )->rawParams( $llink )->parse() . "</li>\n";
            } elseif ( $warning == 'duplicate' ) {
                $msg = $this->getDupeWarning( $args );
            } elseif ( $warning == 'duplicate-archive' ) {
                if ( $args === '' ) {
                    $msg = "\t<li>" . $this->msg( 'file-deleted-duplicate-notitle' )->parse()
                        . "</li>\n";
                } else {
                    $msg = "\t<li>" . $this->msg( 'file-deleted-duplicate',
                            Title::makeTitle( NS_FILE, $args )->getPrefixedText() )->parse()
                        . "</li>\n";
                }
            } else {
                if ( $args === true ) {
                    $args = [];
                } elseif ( !is_array( $args ) ) {
                    $args = [ $args ];
                }
                $msg = "\t<li>" . $this->msg( $warning, $args )->parse() . "</li>\n";
            }
            $warningHtml .= $msg;
        }
        $warningHtml .= "</ul></div>\n";
        $warningHtml .= $this->msg( $uploadWarning )->parseAsBlock();
 
        $form = $this->getUploadForm( $warningHtml, $sessionKey, /* $hideIgnoreWarning */ true );
        $form->setSubmitTextMsg( 'upload-tryagain' );
        $form->addButton( [
            'name' => 'wpUploadIgnoreWarning',
            'value' => $this->msg( 'ignorewarning' )->text()
        ] );
        $form->addButton( [
            'name' => 'wpCancelUpload',
            'value' => $this->msg( 'reuploaddesc' )->text()
        ] );
 
        $this->showUploadForm( $form );
 
        # Indicate that we showed a form
        return true;
    }
 
    protected function showUploadError( $message ) {
        $message = '<h2>' . $this->msg( 'uploadwarning' )->escaped() . '</h2>' .
            Html::errorBox( $message );
        $this->showUploadForm( $this->getUploadForm( $message ) );
    }
 
    protected function processUpload() {
        // Fetch the file if required
        $status = $this->mUpload->fetchFile();
        if ( !$status->isOK() ) {
            $this->showUploadError( $this->getOutput()->parseAsInterface(
                $status->getWikiText( false, false, $this->getLanguage() )
            ) );
 
            return;
        }
        if ( !$this->getHookRunner()->onUploadForm_BeforeProcessing( $this ) ) {
            wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file." );
            // This code path is deprecated. If you want to break upload processing
            // do so by hooking into the appropriate hooks in UploadBase::verifyUpload
            // and UploadBase::verifyFile.
            // If you use this hook to break uploading, the user will be returned
            // an empty form with no error message whatsoever.
            return;
        }
 
        // Upload verification
        $details = $this->mUpload->verifyUpload();
        if ( $details['status'] != UploadBase::OK ) {
            $this->processVerificationError( $details );
 
            return;
        }
 
        // Verify permissions for this title
        $user = $this->getUser();
        $permErrors = $this->mUpload->verifyTitlePermissions( $user );
        if ( $permErrors !== true ) {
            $code = array_shift( $permErrors[0] );
            $this->showRecoverableUploadError( $this->msg( $code, $permErrors[0] )->parse() );
 
            return;
        }
 
        $this->mLocalFile = $this->mUpload->getLocalFile();
 
        // Check warnings if necessary
        if ( !$this->mIgnoreWarning ) {
            $warnings = $this->mUpload->checkWarnings( $user );
            if ( $this->showUploadWarning( $warnings ) ) {
                return;
            }
        }
 
        // This is as late as we can throttle, after expected issues have been handled
        if ( UploadBase::isThrottled( $user ) ) {
            $this->showRecoverableUploadError(
                $this->msg( 'actionthrottledtext' )->escaped()
            );
            return;
        }
 
        // Get the page text if this is not a reupload
        if ( !$this->mForReUpload ) {
            $pageText = self::getInitialPageText( $this->mComment, $this->mLicense,
                $this->mCopyrightStatus, $this->mCopyrightSource, $this->getConfig() );
        } else {
            $pageText = false;
        }
 
        $changeTags = $this->getRequest()->getVal( 'wpChangeTags' );
        if ( $changeTags === null || $changeTags === '' ) {
            $changeTags = [];
        } else {
            $changeTags = array_filter( array_map( 'trim', explode( ',', $changeTags ) ) );
        }
 
        if ( $changeTags ) {
            $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
                $changeTags, $user );
            if ( !$changeTagsStatus->isOK() ) {
                $this->showUploadError( $this->getOutput()->parseAsInterface(
                    $changeTagsStatus->getWikiText( false, false, $this->getLanguage() )
                ) );
 
                return;
            }
        }
 
        $status = $this->mUpload->performUpload(
            $this->mComment,
            $pageText,
            $this->mWatchthis,
            $user,
            $changeTags
        );
 
        if ( !$status->isGood() ) {
            $this->showRecoverableUploadError(
                $this->getOutput()->parseAsInterface(
                    $status->getWikiText( false, false, $this->getLanguage() )
                )
            );
 
            return;
        }
 
        // Success, redirect to description page
        $this->mUploadSuccessful = true;
        $this->getHookRunner()->onSpecialUploadComplete( $this );
        $this->getOutput()->redirect( $this->mLocalFile->getTitle()->getFullURL() );
    }
 
    public static function getInitialPageText( $comment = '', $license = '',
        $copyStatus = '', $source = '', Config $config = null
    ) {
        if ( $config === null ) {
            wfDebug( __METHOD__ . ' called without a Config instance passed to it' );
            $config = MediaWikiServices::getInstance()->getMainConfig();
        }
 
        $msg = [];
        $forceUIMsgAsContentMsg = (array)$config->get( MainConfigNames::ForceUIMsgAsContentMsg );
        /* These messages are transcluded into the actual text of the description page.
         * Thus, forcing them as content messages makes the upload to produce an int: template
         * instead of hardcoding it there in the uploader language.
         */
        foreach ( [ 'license-header', 'filedesc', 'filestatus', 'filesource' ] as $msgName ) {
            if ( in_array( $msgName, $forceUIMsgAsContentMsg ) ) {
                $msg[$msgName] = "{{int:$msgName}}";
            } else {
                $msg[$msgName] = wfMessage( $msgName )->inContentLanguage()->text();
            }
        }
 
        $licenseText = '';
        if ( $license !== '' ) {
            $licenseText = '== ' . $msg['license-header'] . " ==\n{{" . $license . "}}\n";
        }
 
        $pageText = $comment . "\n";
        $headerText = '== ' . $msg['filedesc'] . ' ==';
        if ( $comment !== '' && strpos( $comment, $headerText ) === false ) {
            // prepend header to page text unless it's already there (or there is no content)
            $pageText = $headerText . "\n" . $pageText;
        }
 
        if ( $config->get( MainConfigNames::UseCopyrightUpload ) ) {
            $pageText .= '== ' . $msg['filestatus'] . " ==\n" . $copyStatus . "\n";
            $pageText .= $licenseText;
            $pageText .= '== ' . $msg['filesource'] . " ==\n" . $source;
        } else {
            $pageText .= $licenseText;
        }
 
        // allow extensions to modify the content
        Hooks::runner()->onUploadForm_getInitialPageText( $pageText, $msg, $config );
 
        return $pageText;
    }
 
    protected function getWatchCheck() {
        $user = $this->getUser();
        if ( $this->userOptionsLookup->getBoolOption( $user, 'watchdefault' ) ) {
            // Watch all edits!
            return true;
        }
 
        $desiredTitleObj = Title::makeTitleSafe( NS_FILE, $this->mDesiredDestName );
        if ( $desiredTitleObj instanceof Title &&
            $this->watchlistManager->isWatched( $user, $desiredTitleObj ) ) {
            // Already watched, don't change that
            return true;
        }
 
        $local = $this->localRepo->newFile( $this->mDesiredDestName );
        if ( $local && $local->exists() ) {
            // We're uploading a new version of an existing file.
            // No creation, so don't watch it if we're not already.
            return false;
        } else {
            // New page should get watched if that's our option.
            return $this->userOptionsLookup->getBoolOption( $user, 'watchcreations' ) ||
                $this->userOptionsLookup->getBoolOption( $user, 'watchuploads' );
        }
    }
 
    protected function processVerificationError( $details ) {
        switch ( $details['status'] ) {
            case UploadBase::MIN_LENGTH_PARTNAME:
                $this->showRecoverableUploadError( $this->msg( 'minlength1' )->escaped() );
                break;
            case UploadBase::ILLEGAL_FILENAME:
                $this->showRecoverableUploadError( $this->msg( 'illegalfilename',
                    $details['filtered'] )->parse() );
                break;
            case UploadBase::FILENAME_TOO_LONG:
                $this->showRecoverableUploadError( $this->msg( 'filename-toolong' )->escaped() );
                break;
            case UploadBase::FILETYPE_MISSING:
                $this->showRecoverableUploadError( $this->msg( 'filetype-missing' )->parse() );
                break;
            case UploadBase::WINDOWS_NONASCII_FILENAME:
                $this->showRecoverableUploadError( $this->msg( 'windows-nonascii-filename' )->parse() );
                break;
 
            case UploadBase::EMPTY_FILE:
                $this->showUploadError( $this->msg( 'emptyfile' )->escaped() );
                break;
            case UploadBase::FILE_TOO_LARGE:
                $this->showUploadError( $this->msg( 'largefileserver' )->escaped() );
                break;
            case UploadBase::FILETYPE_BADTYPE:
                $msg = $this->msg( 'filetype-banned-type' );
                if ( isset( $details['blacklistedExt'] ) ) {
                    $msg->params( $this->getLanguage()->commaList( $details['blacklistedExt'] ) );
                } else {
                    $msg->params( $details['finalExt'] );
                }
                $extensions =
                    array_unique( $this->getConfig()->get( MainConfigNames::FileExtensions ) );
                $msg->params( $this->getLanguage()->commaList( $extensions ),
                    count( $extensions ) );
 
                // Add PLURAL support for the first parameter. This results
                // in a bit unlogical parameter sequence, but does not break
                // old translations
                if ( isset( $details['blacklistedExt'] ) ) {
                    $msg->params( count( $details['blacklistedExt'] ) );
                } else {
                    $msg->params( 1 );
                }
 
                $this->showUploadError( $msg->parse() );
                break;
            case UploadBase::VERIFICATION_ERROR:
                unset( $details['status'] );
                $code = array_shift( $details['details'] );
                $this->showUploadError( $this->msg( $code, $details['details'] )->parse() );
                break;
            case UploadBase::HOOK_ABORTED:
                if ( is_array( $details['error'] ) ) { # allow hooks to return error details in an array
                    $args = $details['error'];
                    $error = array_shift( $args );
                } else {
                    $error = $details['error'];
                    $args = null;
                }
 
                $this->showUploadError( $this->msg( $error, $args )->parse() );
                break;
            default:
                throw new MWException( __METHOD__ . ": Unknown value `{$details['status']}`" );
        }
    }
 
    protected function unsaveUploadedFile() {
        if ( !( $this->mUpload instanceof UploadFromStash ) ) {
            return true;
        }
        $success = $this->mUpload->unsaveUploadedFile();
        if ( !$success ) {
            $this->getOutput()->showFatalError(
                $this->msg( 'filedeleteerror' )
                    ->params( $this->mUpload->getTempPath() )
                    ->escaped()
            );
 
            return false;
        } else {
            return true;
        }
    }
 
    public static function getExistsWarning( $exists ) {
        if ( !$exists ) {
            return '';
        }
 
        $file = $exists['file'];
        $filename = $file->getTitle()->getPrefixedText();
        $warnMsg = null;
 
        if ( $exists['warning'] == 'exists' ) {
            // Exact match
            $warnMsg = wfMessage( 'fileexists', $filename );
        } elseif ( $exists['warning'] == 'page-exists' ) {
            // Page exists but file does not
            $warnMsg = wfMessage( 'filepageexists', $filename );
        } elseif ( $exists['warning'] == 'exists-normalized' ) {
            $warnMsg = wfMessage( 'fileexists-extension', $filename,
                $exists['normalizedFile']->getTitle()->getPrefixedText() );
        } elseif ( $exists['warning'] == 'thumb' ) {
            // Swapped argument order compared with other messages for backwards compatibility
            $warnMsg = wfMessage( 'fileexists-thumbnail-yes',
                $exists['thumbFile']->getTitle()->getPrefixedText(), $filename );
        } elseif ( $exists['warning'] == 'thumb-name' ) {
            // Image w/o '180px-' does not exists, but we do not like these filenames
            $name = $file->getName();
            $badPart = substr( $name, 0, strpos( $name, '-' ) + 1 );
            $warnMsg = wfMessage( 'file-thumbnail-no', $badPart );
        } elseif ( $exists['warning'] == 'bad-prefix' ) {
            $warnMsg = wfMessage( 'filename-bad-prefix', $exists['prefix'] );
        }
 
        return $warnMsg ? $warnMsg->page( $file->getTitle() )->parse() : '';
    }
 
    public function getDupeWarning( $dupes ) {
        if ( !$dupes ) {
            return '';
        }
 
        $gallery = ImageGalleryBase::factory( false, $this->getContext() );
        $gallery->setShowBytes( false );
        $gallery->setShowDimensions( false );
        foreach ( $dupes as $file ) {
            $gallery->add( $file->getTitle() );
        }
 
        return '<li>' .
            $this->msg( 'file-exists-duplicate' )->numParams( count( $dupes ) )->parse() .
            $gallery->toHTML() . "</li>\n";
    }
 
    protected function getGroupName() {
        return 'media';
    }
 
    public static function rotationEnabled() {
        $bitmapHandler = new BitmapHandler();
        return $bitmapHandler->autoRotateEnabled();
    }
}