Extension:UploadCheck/Code

From Linux Web Expert

Revision as of 17:49, 16 January 2024 by imported>Jdforrester (WMF) (Replace deprecated 'source' tag with 'syntaxhighlight'.)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

UploadCheck.php

<?PHP
/*
 * ***** BEGIN LICENSE BLOCK *****
 * This file is part of UploadCheck.
 * Copyright © 20013 Martin Strecker. All rights reserved.
 *
 * UploadCheck 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.
 *
 * UploadCheck 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. (http://www.gnu.org/licenses/)
 *
 * ***** END LICENSE BLOCK *****
 *
 * UploadCheck is a tool for MediaWiki.
 */

if ( !defined( 'MEDIAWIKI' ) ) {
        die( 'This is not a valid entry point to MediaWiki.' );
}

$wgExtensionCredits['specialpage'] [] = array (
'path' => __FILE__,
'name' => 'UploadCheck',
'author' => 'Martin Strecker',
'descriptionmsg' => 'uploadcheck_desc',
'version' => 1.0,
'url' => 'https://www.mediawiki.org/wiki/Extension:UploadCheck',
);

$dir = dirname(__FILE__) . '/';

$wgAutoloadClasses['SpecialUploadCheck'] = $dir . 'SpecialUploadCheck.php';
$wgExtensionMessagesFiles['UploadCheck'] = $dir . 'UploadCheck.i18n.php';
$wgSpecialPages['UploadCheck'] = 'SpecialUploadCheck';

UploadCheck.i18n.php

<?PHP
/*
 * ***** BEGIN LICENSE BLOCK *****
 * This file is part of UploadCheck.
 * Copyright © 2013 Martin Strecker. All rights reserved.
 *
 * UploadCheck 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.
 *
 * UploadCheck 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. (http://www.gnu.org/licenses/)
 *
 * ***** END LICENSE BLOCK *****
 *
 * UploadCheck is a tool for MediaWiki.
 */

$message = array();

/* English
 * @author Martin Strecker
 */
$messages['en'] = array('uploadcheck' => 'Upload file',
                        'uploadcheck_desc' => 'Checks if the fields "Description" and "License" are filled when uploading a file',
                        'uploadcheck_comment' => 'Please write a Comment.',
                        'uploadcheck_license' => 'Please choose a License.'
);

/* German
* @author Martin Strecker
*/
$messages['de'] = array('uploadcheck' => 'Datei hochladen',
                        'uploadcheck_desc' => 'Prüft, ob die Felder "Beschreibung" und "Lizenz" beim Hochladen einer Datei ausgefüllt wurden',
                        'uploadcheck_comment' => 'Bitte geben Sie eine Beschreibung ein.',
                        'uploadcheck_license' => 'Bitte geben Sie eine Lizenz ein.'
);

SpecialUploadCheck.php

<?php
/*
 * ***** BEGIN LICENSE BLOCK *****
 * This file is part of UploadCheck.
 * Copyright © 2013 Martin Strecker. All rights reserved.
 *
 * UploadCheck 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.
 *
 * UploadCheck 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. (http://www.gnu.org/licenses/)
 *
 * ***** END LICENSE BLOCK *****
 *
 * UploadCheck is a tool for MediaWiki.
 */

class SpecialUploadCheck extends SpecialPage {
        function __construct() {
                parent::__construct('UploadCheck');
        }

	/** 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->mBlock );
		}

		# 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 = true ) {
		//Gets the variable $hideWarning from LocalSettings.php to check if the user can ignore the warnings.
		global $hideWarning;
		$hideIgnoreWarning = $hideWarning;
		# 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";


//Edit
//These are the actions for the new warnings.

			} elseif($warning == 'LiCo') {
				$msg = "<li>" . wfMessage('uploadcheck_license') . "</li>";
				$msg .= "<li>" . wfMessage('uploadcheck_comment') . "</li>";
			} elseif($warning == 'License'){
				$msg = "<li>" . wfMessage('uploadcheck_license') . "</li>";
			} elseif($warning == 'Comment'){
				$msg = "<li>" . wfMessage('uploadcheck_comment') . "</li>";
			
//End Edit


			} 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' ) );
		//Check if the user can ignore the warnings.
		global $hideWarning;
		if($hideWarning == false){
			$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 = $this->mUpload->checkWarnings();
//Edit
/*
Here is the creation of the new warnings. If you want to add a new warning you just need the name of the field you want to check.
For example "$this->mLicense".
Don't forget to add an action for your warning further above.
*/

			if($this->mComment == '' && $this->mLicense == ''){
				$warnings['LiCo'] = true;
			}
			elseif($this->mComment == ''){
				$warnings['Comment'] = true;
			}
			elseif($this->mLicense == ''){
				$warnings['License'] = true;
			}

//End Edit
			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 '';
		}
	}
}