Add a way for packagers to override some installation details

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

<?php
/**
 * Implements Special:Upload
 *
 * 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
 * @ingroup Upload
 */

/**
 * Form for handling uploads and special page.
 *
 * @ingroup SpecialPage
 * @ingroup Upload
 */
class SpecialUpload extends SpecialPage {
        /**
         * Constructor : initialise object
         * Get data POSTed through the form and assign them to the object
         * @param $request WebRequest : data posted.
         */
        public function __construct( $request = null ) {
                parent::__construct( 'Upload', 'upload' );
        }

        /** Misc variables **/
        public $mRequest;                       // The WebRequest or FauxRequest this form is supposed to handle
        public $mSourceType;

        /**
         * @var UploadBase
         */
        public $mUpload;

        /**
         * @var LocalFile
         */
        public $mLocalFile;
        public $mUploadClicked;

        /** User input variables from the "description" section **/
        public $mDesiredDestName;       // The requested target file name
        public $mComment;
        public $mLicense;

        /** User input variables from the root section **/
        public $mIgnoreWarning;
        public $mWatchThis;
        public $mCopyrightStatus;
        public $mCopyrightSource;

        /** Hidden variables **/
        public $mDestWarningAck;
        public $mForReUpload;           // The user followed an "overwrite this file" link
        public $mCancelUpload;          // The user clicked "Cancel and return to upload form" button
        public $mTokenOk;
        public $mUploadSuccessful = false;      // Subclasses can use this to determine whether a file was uploaded

        /** Text injection points for hooks not using HTMLForm **/
        public $uploadFormTextTop;
        public $uploadFormTextAfterSummary;

        public $mWatchthis;

        /**
         * Initialize instance variables from request and create an Upload handler
         */
        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->mComment           = $request->getText( 'wpUploadDescription' );
                $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()->isLoggedIn();
                $this->mCopyrightStatus   = $request->getText( 'wpUploadCopyStatus' );
                $this->mCopyrightSource   = $request->getText( 'wpUploadSource' );


                $this->mForReUpload       = $request->getBool( 'wpForReUpload' ); // updating a file
                $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 = '';
        }

        /**
         * This page can be shown if uploading is enabled.
         * Handle permission checking elsewhere in order to be able to show
         * custom error messages.
         *
         * @param $user User object
         * @return Boolean
         */
        public function userCanExecute( User $user ) {
                return UploadBase::isEnabled() && parent::userCanExecute( $user );
        }

        /**
         * Special page entry point
         */
        public function execute( $par ) {
                $this->setHeaders();
                $this->outputHeader();

                # Check uploading enabled
                if( !UploadBase::isEnabled() ) {
                        throw new ErrorPageError( 'uploaddisabled', 'uploaddisabledtext' );
                }

                # Check permissions
                $user = $this->getUser();
                $permissionRequired = UploadBase::isAllowed( $user );
                if( $permissionRequired !== true ) {
                        throw new PermissionsError( $permissionRequired );
                }

                # Check blocks
                if( $user->isBlocked() ) {
                        throw new UserBlockedError( $user->getBlock() );
                }

                # 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 ( $this->mCancelUpload ) {
                        if ( !$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 )
                ) {
                        $this->processUpload();
                } else {
                        # Backwards compatibility hook
                        if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) ) {
                                wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
                                return;
                        }
                        $this->showUploadForm( $this->getUploadForm() );
                }

                # Cleanup
                if ( $this->mUpload ) {
                        $this->mUpload->cleanupTempFile();
                }
        }

        /**
         * Show the main upload form
         *
         * @param $form Mixed: an HTMLForm instance or HTML string to show
         */
        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 );
                }

        }

        /**
         * Get an UploadForm instance with title and text properly set.
         *
         * @param $message String: HTML string to add to the form
         * @param $sessionKey String: session key in case this is a stashed upload
         * @param $hideIgnoreWarning Boolean: whether to hide "ignore warning" check box
         * @return UploadForm
         */
        protected function getUploadForm( $message = '', $sessionKey = '', $hideIgnoreWarning = false ) {
                # Initialize form
                $form = new UploadForm( array(
                        '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() );
                $form->setTitle( $this->getTitle() );

                # Check the token, but only if necessary
                if(
                        !$this->mTokenOk && !$this->mCancelUpload &&
                        ( $this->mUpload && $this->mUploadClicked )
                ) {
                        $form->addPreText( wfMsgExt( 'session_fail_preview', 'parseinline' ) );
                }

                # 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' that requires JS
                $desiredTitleObj = Title::makeTitleSafe( NS_FILE, $this->mDesiredDestName );
                $delNotice = ''; // empty by default
                if ( $desiredTitleObj instanceof Title && !$desiredTitleObj->exists() ) {
                        LogEventsList::showLogExtract( $delNotice, array( 'delete', 'move' ),
                                $desiredTitleObj,
                                '', array( 'lim' => 10,
                                           'conds' => array( "log_action != 'revision'" ),
                                           'showIfEmpty' => false,
                                           'msgKey' => array( 'upload-recreate-warning' ) )
                        );
                }
                $form->addPreText( $delNotice );

                # Add text to form
                $form->addPreText( '<div id="uploadtext">' .
                        wfMsgExt( 'uploadtext', 'parse', array( $this->mDesiredDestName ) ) .
                        '</div>' );
                # Add upload error message
                $form->addPreText( $message );

                # Add footer to form
                $uploadFooter = wfMessage( 'uploadfooter' );
                if ( !$uploadFooter->isDisabled() ) {
                        $form->addPostText( '<div id="mw-upload-footer-message">'
                                . $this->getOutput()->parse( $uploadFooter->plain() ) . "</div>\n" );
                }

                return $form;
        }

        /**
         * Shows the "view X deleted revivions link""
         */
        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->isDeleted();
                        if ( $count > 0 && $user->isAllowed( 'deletedhistory' ) ) {
                                $link = wfMsgExt(
                                        $user->isAllowed( 'delete' ) ? 'thisisdeleted' : 'viewdeleted',
                                        array( 'parse', 'replaceafter' ),
                                        Linker::linkKnown(
                                                SpecialPage::getTitleFor( 'Undelete', $title->getPrefixedText() ),
                                                wfMsgExt( 'restorelink', array( 'parsemag', 'escape' ), $count )
                                        )
                                );
                                $this->getOutput()->addHTML( "<div id=\"contentSub2\">{$link}</div>" );
                        }
                }
        }

        /**
         * Stashes the upload and shows the main upload form.
         *
         * Note: only errors that can be handled by changing the name or
         * description should be redirected here. It should be assumed that the
         * file itself is sane and has passed UploadBase::verifyFile. This
         * essentially means that UploadBase::VERIFICATION_ERROR and
         * UploadBase::EMPTY_FILE should not be passed here.
         *
         * @param $message String: HTML message to be passed to mainUploadForm
         */
        protected function showRecoverableUploadError( $message ) {
                $sessionKey = $this->mUpload->stashSession();
                $message = '<h2>' . wfMsgHtml( 'uploaderror' ) . "</h2>\n" .
                        '<div class="error">' . $message . "</div>\n";

                $form = $this->getUploadForm( $message, $sessionKey );
                $form->setSubmitText( wfMsg( 'upload-tryagain' ) );
                $this->showUploadForm( $form );
        }
        /**
         * Stashes the upload, shows the main form, but adds an "continue anyway button".
         * Also checks whether there are actually warnings to display.
         *
         * @param $warnings Array
         * @return boolean true if warnings were displayed, false if there are no
         *      warnings and the should continue processing like there was no warning
         */
        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;
                }

                $sessionKey = $this->mUpload->stashSession();

                $warningHtml = '<h2>' . wfMsgHtml( 'uploadwarning' ) . "</h2>\n"
                        . '<ul class="warning">';
                foreach( $warnings as $warning => $args ) {
                        if( $warning == 'exists' ) {
                                $msg = "\t<li>" . self::getExistsWarning( $args ) . "</li>\n";
                        } elseif( $warning == 'duplicate' ) {
                                $msg = self::getDupeWarning( $args );
                        } elseif( $warning == 'duplicate-archive' ) {
                                $msg = "\t<li>" . wfMsgExt( 'file-deleted-duplicate', 'parseinline',
                                                array( Title::makeTitle( NS_FILE, $args )->getPrefixedText() ) )
                                        . "</li>\n";
                        } else {
                                if ( $args === true ) {
                                        $args = array();
                                } elseif ( !is_array( $args ) ) {
                                        $args = array( $args );
                                }
                                $msg = "\t<li>" . wfMsgExt( $warning, 'parseinline', $args ) . "</li>\n";
                        }
                        $warningHtml .= $msg;
                }
                $warningHtml .= "</ul>\n";
                $warningHtml .= wfMsgExt( 'uploadwarning-text', 'parse' );

                $form = $this->getUploadForm( $warningHtml, $sessionKey, /* $hideIgnoreWarning */ true );
                $form->setSubmitText( wfMsg( 'upload-tryagain' ) );
                $form->addButton( 'wpUploadIgnoreWarning', wfMsg( 'ignorewarning' ) );
                $form->addButton( 'wpCancelUpload', wfMsg( 'reuploaddesc' ) );

                $this->showUploadForm( $form );

                # Indicate that we showed a form
                return true;
        }

        /**
         * Show the upload form with error message, but do not stash the file.
         *
         * @param $message string HTML string
         */
        protected function showUploadError( $message ) {
                $message = '<h2>' . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" .
                        '<div class="error">' . $message . "</div>\n";
                $this->showUploadForm( $this->getUploadForm( $message ) );
        }

        /**
         * Do the upload.
         * Checks are made in SpecialUpload::execute()
         */
        protected function processUpload() {
                // Fetch the file if required
                $status = $this->mUpload->fetchFile();
                if( !$status->isOK() ) {
                        $this->showUploadError( $this->getOutput()->parse( $status->getWikiText() ) );
                        return;
                }

                if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) ) {
                        wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file.\n" );
                        // 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
                $permErrors = $this->mUpload->verifyTitlePermissions( $this->getUser() );
                if( $permErrors !== true ) {
                        $code = array_shift( $permErrors[0] );
                        $this->showRecoverableUploadError( wfMsgExt( $code,
                                        'parseinline', $permErrors[0] ) );
                        return;
                }

                $this->mLocalFile = $this->mUpload->getLocalFile();

                // Check warnings if necessary
                if( !$this->mIgnoreWarning ) {
                        $warnings = $this->mUpload->checkWarnings();
                        if( $this->showUploadWarning( $warnings ) ) {
                                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 );
                } else {
                        $pageText = false;
                }
                $status = $this->mUpload->performUpload( $this->mComment, $pageText, $this->mWatchthis, $this->getUser() );
                if ( !$status->isGood() ) {
                        $this->showUploadError( $this->getOutput()->parse( $status->getWikiText() ) );
                        return;
                }

                // Success, redirect to description page
                $this->mUploadSuccessful = true;
                wfRunHooks( 'SpecialUploadComplete', array( &$this ) );
                $this->getOutput()->redirect( $this->mLocalFile->getTitle()->getFullURL() );
        }

        /**
         * Get the initial image page text based on a comment and optional file status information
         * @param $comment string
         * @param $license string
         * @param $copyStatus string
         * @param $source string
         * @return string
         */
        public static function getInitialPageText( $comment = '', $license = '', $copyStatus = '', $source = '' ) {
                global $wgUseCopyrightUpload, $wgForceUIMsgAsContentMsg;
                $wgForceUIMsgAsContentMsg = (array) $wgForceUIMsgAsContentMsg;

                $msg = array();
                /* 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( array( 'license-header', 'filedesc', 'filestatus', 'filesource' ) as $msgName ) {
                        if ( in_array( $msgName, $wgForceUIMsgAsContentMsg ) ) {
                                $msg[$msgName] = "{{int:$msgName}}";
                        } else {
                                $msg[$msgName] = wfMsgForContent( $msgName );
                        }
                }

                if ( $wgUseCopyrightUpload ) {
                        $licensetxt = '';
                        if ( $license != '' ) {
                                $licensetxt = '== ' . $msg[ 'license-header' ] . " ==\n" . '{{' . $license . '}}' . "\n";
                        }
                        $pageText = '== ' . $msg[ 'filedesc' ] . " ==\n" . $comment . "\n" .
                                '== ' . $msg[ 'filestatus' ] . " ==\n" . $copyStatus . "\n" .
                                "$licensetxt" .
                                '== ' . $msg[ 'filesource' ] . " ==\n" . $source;
                } else {
                        if ( $license != '' ) {
                                $filedesc = $comment == '' ? '' : '== ' . $msg[ 'filedesc' ] . " ==\n" . $comment . "\n";
                                        $pageText = $filedesc .
                                        '== ' . $msg[ 'license-header' ] . " ==\n" . '{{' . $license . '}}' . "\n";
                        } else {
                                $pageText = $comment;
                        }
                }
                return $pageText;
        }

        /**
         * See if we should check the 'watch this page' checkbox on the form
         * based on the user's preferences and whether we're being asked
         * to create a new file or update an existing one.
         *
         * In the case where 'watch edits' is off but 'watch creations' is on,
         * we'll leave the box unchecked.
         *
         * Note that the page target can be changed *on the form*, so our check
         * state can get out of sync.
         * @return Bool|String
         */
        protected function getWatchCheck() {
                if( $this->getUser()->getOption( 'watchdefault' ) ) {
                        // Watch all edits!
                        return true;
                }

                $local = wfLocalFile( $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 $local->getTitle()->userIsWatching();
                } else {
                        // New page should get watched if that's our option.
                        return $this->getUser()->getOption( 'watchcreations' );
                }
        }


        /**
         * Provides output to the user for a result of UploadBase::verifyUpload
         *
         * @param $details Array: result of UploadBase::verifyUpload
         */
        protected function processVerificationError( $details ) {
                global $wgFileExtensions;

                switch( $details['status'] ) {

                        /** Statuses that only require name changing **/
                        case UploadBase::MIN_LENGTH_PARTNAME:
                                $this->showRecoverableUploadError( wfMsgHtml( 'minlength1' ) );
                                break;
                        case UploadBase::ILLEGAL_FILENAME:
                                $this->showRecoverableUploadError( wfMsgExt( 'illegalfilename',
                                        'parseinline', $details['filtered'] ) );
                                break;
                        case UploadBase::FILENAME_TOO_LONG:
                                $this->showRecoverableUploadError( wfMsgHtml( 'filename-toolong' ) );
                                break;
                        case UploadBase::FILETYPE_MISSING:
                                $this->showRecoverableUploadError( wfMsgExt( 'filetype-missing',
                                        'parseinline' ) );
                                break;
                        case UploadBase::WINDOWS_NONASCII_FILENAME:
                                $this->showRecoverableUploadError( wfMsgExt( 'windows-nonascii-filename',
                                        'parseinline' ) );
                                break;

                        /** Statuses that require reuploading **/
                        case UploadBase::EMPTY_FILE:
                                $this->showUploadError( wfMsgHtml( 'emptyfile' ) );
                                break;
                        case UploadBase::FILE_TOO_LARGE:
                                $this->showUploadError( wfMsgHtml( 'largefileserver' ) );
                                break;
                        case UploadBase::FILETYPE_BADTYPE:
                                $msg = wfMessage( 'filetype-banned-type' );
                                if ( isset( $details['blacklistedExt'] ) ) {
                                        $msg->params( $this->getLanguage()->commaList( $details['blacklistedExt'] ) );
                                } else {
                                        $msg->params( $details['finalExt'] );
                                }
                                $msg->params( $this->getLanguage()->commaList( $wgFileExtensions ),
                                        count( $wgFileExtensions ) );

                                // 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( wfMsgExt( $code, 'parseinline', $details['details'] ) );
                                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( wfMsgExt( $error, 'parseinline', $args ) );
                                break;
                        default:
                                throw new MWException( __METHOD__ . ": Unknown value `{$details['status']}`" );
                }
        }

        /**
         * Remove a temporarily kept file stashed by saveTempUploadedFile().
         *
         * @return Boolean: success
         */
        protected function unsaveUploadedFile() {
                if ( !( $this->mUpload instanceof UploadFromStash ) ) {
                        return true;
                }
                $success = $this->mUpload->unsaveUploadedFile();
                if ( !$success ) {
                        $this->getOutput()->showFileDeleteError( $this->mUpload->getTempPath() );
                        return false;
                } else {
                        return true;
                }
        }

        /*** Functions for formatting warnings ***/

        /**
         * Formats a result of UploadBase::getExistsWarning as HTML
         * This check is static and can be done pre-upload via AJAX
         *
         * @param $exists Array: the result of UploadBase::getExistsWarning
         * @return String: empty string if there is no warning or an HTML fragment
         */
        public static function getExistsWarning( $exists ) {
                if ( !$exists ) {
                        return '';
                }

                $file = $exists['file'];
                $filename = $file->getTitle()->getPrefixedText();
                $warning = '';

                if( $exists['warning'] == 'exists' ) {
                        // Exact match
                        $warning = wfMsgExt( 'fileexists', 'parseinline', $filename );
                } elseif( $exists['warning'] == 'page-exists' ) {
                        // Page exists but file does not
                        $warning = wfMsgExt( 'filepageexists', 'parseinline', $filename );
                } elseif ( $exists['warning'] == 'exists-normalized' ) {
                        $warning = wfMsgExt( 'fileexists-extension', 'parseinline', $filename,
                                $exists['normalizedFile']->getTitle()->getPrefixedText() );
                } elseif ( $exists['warning'] == 'thumb' ) {
                        // Swapped argument order compared with other messages for backwards compatibility
                        $warning = wfMsgExt( 'fileexists-thumbnail-yes', 'parseinline',
                                $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 );
                        $warning = wfMsgExt( 'file-thumbnail-no', 'parseinline', $badPart );
                } elseif ( $exists['warning'] == 'bad-prefix' ) {
                        $warning = wfMsgExt( 'filename-bad-prefix', 'parseinline', $exists['prefix'] );
                } elseif ( $exists['warning'] == 'was-deleted' ) {
                        # If the file existed before and was deleted, warn the user of this
                        $ltitle = SpecialPage::getTitleFor( 'Log' );
                        $llink = Linker::linkKnown(
                                $ltitle,
                                wfMsgHtml( 'deletionlog' ),
                                array(),
                                array(
                                        'type' => 'delete',
                                        'page' => $filename
                                )
                        );
                        $warning = wfMsgExt( 'filewasdeleted', array( 'parse', 'replaceafter' ), $llink );
                }

                return $warning;
        }

        /**
         * Get a list of warnings
         *
         * @param $filename String: local filename, e.g. 'file exists', 'non-descriptive filename'
         * @return Array: list of warning messages
         */
        public static function ajaxGetExistsWarning( $filename ) {
                $file = wfFindFile( $filename );
                if( !$file ) {
                        // Force local file so we have an object to do further checks against
                        // if there isn't an exact match...
                        $file = wfLocalFile( $filename );
                }
                $s = '&#160;';
                if ( $file ) {
                        $exists = UploadBase::getExistsWarning( $file );
                        $warning = self::getExistsWarning( $exists );
                        if ( $warning !== '' ) {
                                $s = "<div>$warning</div>";
                        }
                }
                return $s;
        }

        /**
         * Construct a warning and a gallery from an array of duplicate files.
         * @param $dupes array
         * @return string
         */
        public static function getDupeWarning( $dupes ) {
                global $wgOut;
                if( $dupes ) {
                        $msg = '<gallery>';
                        foreach( $dupes as $file ) {
                                $title = $file->getTitle();
                                $msg .= $title->getPrefixedText() .
                                        '|' . $title->getText() . "\n";
                        }
                        $msg .= '</gallery>';
                        return '<li>' .
                                wfMsgExt( 'file-exists-duplicate', array( 'parse' ), count( $dupes ) ) .
                                $wgOut->parse( $msg ) .
                                "</li>\n";
                } else {
                        return '';
                }
        }

}

/**
 * Sub class of HTMLForm that provides the form section of SpecialUpload
 */
class UploadForm extends HTMLForm {
        protected $mWatch;
        protected $mForReUpload;
        protected $mSessionKey;
        protected $mHideIgnoreWarning;
        protected $mDestWarningAck;
        protected $mDestFile;

        protected $mComment;
        protected $mTextTop;
        protected $mTextAfterSummary;

        protected $mSourceIds;

        protected $mMaxFileSize = array();

        protected $mMaxUploadSize = array();

        public function __construct( array $options = array(), IContextSource $context = null ) {
                $this->mWatch = !empty( $options['watch'] );
                $this->mForReUpload = !empty( $options['forreupload'] );
                $this->mSessionKey = isset( $options['sessionkey'] )
                                ? $options['sessionkey'] : '';
                $this->mHideIgnoreWarning = !empty( $options['hideignorewarning'] );
                $this->mDestWarningAck = !empty( $options['destwarningack'] );
                $this->mDestFile = isset( $options['destfile'] ) ? $options['destfile'] : '';

                $this->mComment = isset( $options['description'] ) ?
                        $options['description'] : '';

                $this->mTextTop = isset( $options['texttop'] )
                        ? $options['texttop'] : '';

                $this->mTextAfterSummary = isset( $options['textaftersummary'] )
                        ? $options['textaftersummary'] : '';

                $sourceDescriptor = $this->getSourceSection();
                $descriptor = $sourceDescriptor
                        + $this->getDescriptionSection()
                        + $this->getOptionsSection();

                wfRunHooks( 'UploadFormInitDescriptor', array( &$descriptor ) );
                parent::__construct( $descriptor, $context, 'upload' );

                # Set some form properties
                $this->setSubmitText( wfMsg( 'uploadbtn' ) );
                $this->setSubmitName( 'wpUpload' );
                # Used message keys: 'accesskey-upload', 'tooltip-upload'
                $this->setSubmitTooltip( 'upload' );
                $this->setId( 'mw-upload-form' );

                # Build a list of IDs for javascript insertion
                $this->mSourceIds = array();
                foreach ( $sourceDescriptor as $field ) {
                        if ( !empty( $field['id'] ) ) {
                                $this->mSourceIds[] = $field['id'];
                        }
                }

        }

        /**
         * Get the descriptor of the fieldset that contains the file source
         * selection. The section is 'source'
         *
         * @return Array: descriptor array
         */
        protected function getSourceSection() {
                if ( $this->mSessionKey ) {
                        return array(
                                'SessionKey' => array(
                                        'type' => 'hidden',
                                        'default' => $this->mSessionKey,
                                ),
                                'SourceType' => array(
                                        'type' => 'hidden',
                                        'default' => 'Stash',
                                ),
                        );
                }

                $canUploadByUrl = UploadFromUrl::isEnabled() && UploadFromUrl::isAllowed( $this->getUser() );
                $radio = $canUploadByUrl;
                $selectedSourceType = strtolower( $this->getRequest()->getText( 'wpSourceType', 'File' ) );

                $descriptor = array();
                if ( $this->mTextTop ) {
                        $descriptor['UploadFormTextTop'] = array(
                                'type' => 'info',
                                'section' => 'source',
                                'default' => $this->mTextTop,
                                'raw' => true,
                        );
                }

                $this->mMaxUploadSize['file'] = UploadBase::getMaxUploadSize( 'file' );
                # Limit to upload_max_filesize unless we are running under HipHop and
                # that setting doesn't exist
                if ( !wfIsHipHop() ) {
                        $this->mMaxUploadSize['file'] = min( $this->mMaxUploadSize['file'],
                                wfShorthandToInteger( ini_get( 'upload_max_filesize' ) ),
                                wfShorthandToInteger( ini_get( 'post_max_size' ) )
                        );
                }

                $descriptor['UploadFile'] = array(
                        'class' => 'UploadSourceField',
                        'section' => 'source',
                        'type' => 'file',
                        'id' => 'wpUploadFile',
                        'label-message' => 'sourcefilename',
                        'upload-type' => 'File',
                        'radio' => &$radio,
                        'help' => wfMsgExt( 'upload-maxfilesize',
                                        array( 'parseinline', 'escapenoentities' ),
                                        $this->getContext()->getLanguage()->formatSize( $this->mMaxUploadSize['file'] )
                                ) . ' ' . wfMsgHtml( 'upload_source_file' ),
                        'checked' => $selectedSourceType == 'file',
                );
                if ( $canUploadByUrl ) {
                        $this->mMaxUploadSize['url'] = UploadBase::getMaxUploadSize( 'url' );
                        $descriptor['UploadFileURL'] = array(
                                'class' => 'UploadSourceField',
                                'section' => 'source',
                                'id' => 'wpUploadFileURL',
                                'label-message' => 'sourceurl',
                                'upload-type' => 'url',
                                'radio' => &$radio,
                                'help' => wfMsgExt( 'upload-maxfilesize',
                                                array( 'parseinline', 'escapenoentities' ),
                                                $this->getContext()->getLanguage()->formatSize( $this->mMaxUploadSize['url'] )
                                        ) . ' ' . wfMsgHtml( 'upload_source_url' ),
                                'checked' => $selectedSourceType == 'url',
                        );
                }
                wfRunHooks( 'UploadFormSourceDescriptors', array( &$descriptor, &$radio, $selectedSourceType ) );

                $descriptor['Extensions'] = array(
                        'type' => 'info',
                        'section' => 'source',
                        'default' => $this->getExtensionsMessage(),
                        'raw' => true,
                );
                return $descriptor;
        }

        /**
         * Get the messages indicating which extensions are preferred and prohibitted.
         *
         * @return String: HTML string containing the message
         */
        protected function getExtensionsMessage() {
                # Print a list of allowed file extensions, if so configured.  We ignore
                # MIME type here, it's incomprehensible to most people and too long.
                global $wgCheckFileExtensions, $wgStrictFileExtensions,
                $wgFileExtensions, $wgFileBlacklist;

                if( $wgCheckFileExtensions ) {
                        if( $wgStrictFileExtensions ) {
                                # Everything not permitted is banned
                                $extensionsList =
                                        '<div id="mw-upload-permitted">' .
                                        wfMsgExt( 'upload-permitted', 'parse', $this->getContext()->getLanguage()->commaList( $wgFileExtensions ) ) .
                                        "</div>\n";
                        } else {
                                # We have to list both preferred and prohibited
                                $extensionsList =
                                        '<div id="mw-upload-preferred">' .
                                        wfMsgExt( 'upload-preferred', 'parse', $this->getContext()->getLanguage()->commaList( $wgFileExtensions ) ) .
                                        "</div>\n" .
                                        '<div id="mw-upload-prohibited">' .
                                        wfMsgExt( 'upload-prohibited', 'parse', $this->getContext()->getLanguage()->commaList( $wgFileBlacklist ) ) .
                                        "</div>\n";
                        }
                } else {
                        # Everything is permitted.
                        $extensionsList = '';
                }
                return $extensionsList;
        }

        /**
         * Get the descriptor of the fieldset that contains the file description
         * input. The section is 'description'
         *
         * @return Array: descriptor array
         */
        protected function getDescriptionSection() {
                if ( $this->mSessionKey ) {
                        $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash();
                        try {
                                $file = $stash->getFile( $this->mSessionKey );
                        } catch ( MWException $e ) {
                                $file = null;
                        }
                        if ( $file ) {
                                global $wgContLang;

                                $mto = $file->transform( array( 'width' => 120 ) );
                                $this->addHeaderText(
                                        '<div class="thumb t' . $wgContLang->alignEnd() . '">' .
                                        Html::element( 'img', array(
                                                'src' => $mto->getUrl(),
                                                'class' => 'thumbimage',
                                        ) ) . '</div>', 'description' );
                        }
                }

                $descriptor = array(
                        'DestFile' => array(
                                'type' => 'text',
                                'section' => 'description',
                                'id' => 'wpDestFile',
                                'label-message' => 'destfilename',
                                'size' => 60,
                                'default' => $this->mDestFile,
                                # @todo FIXME: Hack to work around poor handling of the 'default' option in HTMLForm
                                'nodata' => strval( $this->mDestFile ) !== '',
                        ),
                        'UploadDescription' => array(
                                'type' => 'textarea',
                                'section' => 'description',
                                'id' => 'wpUploadDescription',
                                'label-message' => $this->mForReUpload
                                        ? 'filereuploadsummary'
                                        : 'fileuploadsummary',
                                'default' => $this->mComment,
                                'cols' => intval( $this->getUser()->getOption( 'cols' ) ),
                                'rows' => 8,
                        )
                );
                if ( $this->mTextAfterSummary ) {
                        $descriptor['UploadFormTextAfterSummary'] = array(
                                'type' => 'info',
                                'section' => 'description',
                                'default' => $this->mTextAfterSummary,
                                'raw' => true,
                        );
                }

                $descriptor += array(
                        'EditTools' => array(
                                'type' => 'edittools',
                                'section' => 'description',
                                'message' => 'edittools-upload',
                        )
                );

                if ( $this->mForReUpload ) {
                        $descriptor['DestFile']['readonly'] = true;
                } else {
                        $descriptor['License'] = array(
                                'type' => 'select',
                                'class' => 'Licenses',
                                'section' => 'description',
                                'id' => 'wpLicense',
                                'label-message' => 'license',
                        );
                }

                global $wgUseCopyrightUpload;
                if ( $wgUseCopyrightUpload ) {
                        $descriptor['UploadCopyStatus'] = array(
                                'type' => 'text',
                                'section' => 'description',
                                'id' => 'wpUploadCopyStatus',
                                'label-message' => 'filestatus',
                        );
                        $descriptor['UploadSource'] = array(
                                'type' => 'text',
                                'section' => 'description',
                                'id' => 'wpUploadSource',
                                'label-message' => 'filesource',
                        );
                }

                return $descriptor;
        }

        /**
         * Get the descriptor of the fieldset that contains the upload options,
         * such as "watch this file". The section is 'options'
         *
         * @return Array: descriptor array
         */
        protected function getOptionsSection() {
                $user = $this->getUser();
                if ( $user->isLoggedIn() ) {
                        $descriptor = array(
                                'Watchthis' => array(
                                        'type' => 'check',
                                        'id' => 'wpWatchthis',
                                        'label-message' => 'watchthisupload',
                                        'section' => 'options',
                                        'default' => $user->getOption( 'watchcreations' ),
                                )
                        );
                }
                if ( !$this->mHideIgnoreWarning ) {
                        $descriptor['IgnoreWarning'] = array(
                                'type' => 'check',
                                'id' => 'wpIgnoreWarning',
                                'label-message' => 'ignorewarnings',
                                'section' => 'options',
                        );
                }

                $descriptor['DestFileWarningAck'] = array(
                        'type' => 'hidden',
                        'id' => 'wpDestFileWarningAck',
                        'default' => $this->mDestWarningAck ? '1' : '',
                );

                if ( $this->mForReUpload ) {
                        $descriptor['ForReUpload'] = array(
                                'type' => 'hidden',
                                'id' => 'wpForReUpload',
                                'default' => '1',
                        );
                }

                return $descriptor;
        }

        /**
         * Add the upload JS and show the form.
         */
        public function show() {
                $this->addUploadJS();
                parent::show();
        }

        /**
         * Add upload JS to the OutputPage
         */
        protected function addUploadJS() {
                global $wgUseAjax, $wgAjaxUploadDestCheck, $wgAjaxLicensePreview, $wgEnableAPI, $wgStrictFileExtensions;

                $useAjaxDestCheck = $wgUseAjax && $wgAjaxUploadDestCheck;
                $useAjaxLicensePreview = $wgUseAjax && $wgAjaxLicensePreview && $wgEnableAPI;
                $this->mMaxUploadSize['*'] = UploadBase::getMaxUploadSize();

                $scriptVars = array(
                        'wgAjaxUploadDestCheck' => $useAjaxDestCheck,
                        'wgAjaxLicensePreview' => $useAjaxLicensePreview,
                        'wgUploadAutoFill' => !$this->mForReUpload &&
                                // If we received mDestFile from the request, don't autofill
                                // the wpDestFile textbox
                                $this->mDestFile === '',
                        'wgUploadSourceIds' => $this->mSourceIds,
                        'wgStrictFileExtensions' => $wgStrictFileExtensions,
                        'wgCapitalizeUploads' => MWNamespace::isCapitalized( NS_FILE ),
                        'wgMaxUploadSize' => $this->mMaxUploadSize,
                );

                $out = $this->getOutput();
                $out->addJsConfigVars( $scriptVars );


                $out->addModules( array(
                        'mediawiki.action.edit', // For <charinsert> support
                        'mediawiki.legacy.upload', // Old form stuff...
                        'mediawiki.special.upload', // Newer extras for thumbnail preview.
                ) );
        }

        /**
         * Empty function; submission is handled elsewhere.
         *
         * @return bool false
         */
        function trySubmit() {
                return false;
        }

}

/**
 * A form field that contains a radio box in the label
 */
class UploadSourceField extends HTMLTextField {

        /**
         * @param $cellAttributes array
         * @return string
         */
        function getLabelHtml( $cellAttributes = array() ) {
                $id = "wpSourceType{$this->mParams['upload-type']}";
                $label = Html::rawElement( 'label', array( 'for' => $id ), $this->mLabel );

                if ( !empty( $this->mParams['radio'] ) ) {
                        $attribs = array(
                                'name' => 'wpSourceType',
                                'type' => 'radio',
                                'id' => $id,
                                'value' => $this->mParams['upload-type'],
                        );
                        if ( !empty( $this->mParams['checked'] ) ) {
                                $attribs['checked'] = 'checked';
                        }
                        $label .= Html::element( 'input', $attribs );
                }

                return Html::rawElement( 'td', array( 'class' => 'mw-label' ) + $cellAttributes, $label );
        }

        /**
         * @return int
         */
        function getSize() {
                return isset( $this->mParams['size'] )
                        ? $this->mParams['size']
                        : 60;
        }
}