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<?php
class UploadBase {
var $mTempPath;
var $mDesiredDestName, $mDestName, $mRemoveTempFile, $mSourceType;
var $mTitle = false, $mTitleError = 0;
var $mFilteredName, $mFinalExtension;
const SUCCESS = 0;
const OK = 0;
const BEFORE_PROCESSING = 1;
const LARGE_FILE_SERVER = 2;
const EMPTY_FILE = 3;
const MIN_LENGTH_PARTNAME = 4;
const ILLEGAL_FILENAME = 5;
const PROTECTED_PAGE = 6;
const OVERWRITE_EXISTING_FILE = 7;
const FILETYPE_MISSING = 8;
const FILETYPE_BADTYPE = 9;
const VERIFICATION_ERROR = 10;
const UPLOAD_VERIFICATION_ERROR = 11;
const UPLOAD_WARNING = 12;
const INTERNAL_ERROR = 13;
const SESSION_VERSION = 2;
/**
* Returns true if uploads are enabled.
* Can be overriden by subclasses.
*/
static function isEnabled() {
global $wgEnableUploads;
return $wgEnableUploads;
}
/**
* Returns true if the user can use this upload module or else a string
* identifying the missing permission.
* Can be overriden by subclasses.
*/
static function isAllowed( $user ) {
if( !$user->isAllowed( 'upload' ) )
return 'upload';
return true;
}
// Upload handlers. Should probably just be a global
static $uploadHandlers = array( 'Stash', 'Upload', 'Url' );
/**
* Create a form of UploadBase depending on wpSourceType and initializes it
*/
static function createFromRequest( &$request, $type = null ) {
$type = $type ? $type : $request->getVal( 'wpSourceType' );
if( !$type )
return null;
$type = ucfirst($type);
$className = 'UploadFrom'.$type;
if( !in_array( $type, self::$uploadHandlers ) )
return null;
if( !call_user_func( array( $className, 'isEnabled' ) ) )
return null;
if( !call_user_func( array( $className, 'isValidRequest' ), $request ) )
return null;
$handler = new $className;
$handler->initializeFromRequest( $request );
return $handler;
}
/**
* Check whether a request if valid for this handler
*/
static function isValidRequest( $request ) {
return false;
}
function __construct() {}
/**
* Do the real variable initialization
*/
function initialize( $name, $tempPath, $fileSize, $removeTempFile = false ) {
$this->mDesiredDestName = $name;
$this->mTempPath = $tempPath;
$this->mFileSize = $fileSize;
$this->mRemoveTempFile = $removeTempFile;
}
/**
* Fetch the file. Usually a no-op
*/
function fetchFile() {
return self::OK;
}
/**
* Verify whether the upload is sane.
* Returns self::OK or else an array with error information
*/
function verifyUpload() {
global $wgUser;
/**
* If there was no filename or a zero size given, give up quick.
*/
if( empty( $this->mFileSize ) )
return array( 'status' => self::EMPTY_FILE );
$nt = $this->getTitle();
if( is_null( $nt ) ) {
$result = array( 'status' => $this->mTitleError );
if( $this->mTitleError == self::ILLEGAL_FILENAME )
$resul['filtered'] = $this->mFilteredName;
if ( $this->mTitleError == self::FILETYPE_BADTYPE )
$result['finalExt'] = $this->mFinalExtension;
return $result;
}
$this->mLocalFile = wfLocalFile( $nt );
$this->mDestName = $this->mLocalFile->getName();
/**
* In some cases we may forbid overwriting of existing files.
*/
$overwrite = $this->checkOverwrite( $this->mDestName );
if( $overwrite !== true )
return array( 'status' => self::OVERWRITE_EXISTING_FILE, 'overwrite' => $overwrite );
/**
* Look at the contents of the file; if we can recognize the
* type but it's corrupt or data of the wrong type, we should
* probably not accept it.
*/
$verification = $this->verifyFile( $this->mTempPath );
if( $verification !== true ) {
if( !is_array( $verification ) )
$verification = array( $verification );
$verification['status'] = self::VERIFICATION_ERROR;
return $verification;
}
$error = '';
if( !wfRunHooks( 'UploadVerification',
array( $this->mDestName, $this->mTempPath, &$error ) ) ) {
return array( 'status' => self::UPLOAD_VERIFICATION_ERROR, 'error' => $error );
}
return self::OK;
}
/**
* Verifies that it's ok to include the uploaded file
*
* @param string $tmpfile the full path of the temporary file to verify
* @return mixed true of the file is verified, a string or array otherwise.
*/
protected function verifyFile( $tmpfile ) {
$this->mFileProps = File::getPropsFromPath( $this->mTempPath,
$this->mFinalExtension );
$this->checkMacBinary();
#magically determine mime type
$magic = MimeMagic::singleton();
$mime = $magic->guessMimeType( $tmpfile, false );
#check mime type, if desired
global $wgVerifyMimeType;
if ( $wgVerifyMimeType ) {
wfDebug ( "\n\nmime: <$mime> extension: <{$this->mFinalExtension}>\n\n");
#check mime type against file extension
if( !self::verifyExtension( $mime, $this->mFinalExtension ) ) {
return 'uploadcorrupt';
}
#check mime type blacklist
global $wgMimeTypeBlacklist;
if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
&& $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
return array( 'filetype-badmime', $mime );
}
}
#check for htmlish code and javascript
if( $this->detectScript ( $tmpfile, $mime, $this->mFinalExtension ) ) {
return 'uploadscripted';
}
/**
* Scan the uploaded file for viruses
*/
$virus = $this->detectVirus($tmpfile);
if ( $virus ) {
return array( 'uploadvirus', $virus );
}
wfDebug( __METHOD__.": all clear; passing.\n" );
return true;
}
/**
* Check whether the user can edit, upload and create the image
*/
function verifyPermissions( $user ) {
/**
* If the image is protected, non-sysop users won't be able
* to modify it by uploading a new revision.
*/
$nt = $this->getTitle();
if( is_null( $nt ) )
return true;
$permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
$permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
$permErrorsCreate = ( $nt->exists() ? array() : $nt->getUserPermissionsErrors( 'create', $user ) );
if( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
$permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
$permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
return $permErrors;
}
return true;
}
/**
* Check for non fatal problems with the file
*/
function checkWarnings() {
$warning = array();
$filename = $this->mLocalFile->getName();
$n = strrpos( $filename, '.' );
$partname = $n ? substr( $filename, 0, $n ) : $filename;
// Check whether the resulting filename is different from the desired one
if( $this->mDesiredDestName != $filename )
$warning['badfilename'] = $filename;
// Check whether the file extension is on the unwanted list
global $wgCheckFileExtensions, $wgFileExtensions;
if ( $wgCheckFileExtensions ) {
if ( !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) )
$warning['filetype-unwanted-type'] = $this->mFinalExtension;
}
global $wgUploadSizeWarning;
if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) )
$warning['large-file'] = $wgUploadSizeWarning;
if ( $this->mFileSize == 0 )
$warning['emptyfile'] = true;
$exists = self::getExistsWarning( $this->mLocalFile );
if( $exists !== false )
$warning['exists'] = $exists;
// Check whether this may be a thumbnail
if( $exists !== false && $exists[0] != 'thumb'
&& self::isThumbName( $this->mLocalFile->getName() ) )
$warning['file-thumbnail-no'] = substr( $filename , 0,
strpos( $nt->getText() , '-' ) +1 );
$hash = File::sha1Base36( $this->mTempPath );
$dupes = RepoGroup::singleton()->findBySha1( $hash );
if( $dupes )
$warning['duplicate'] = $dupes;
$filenamePrefixBlacklist = self::getFilenamePrefixBlacklist();
foreach( $filenamePrefixBlacklist as $prefix ) {
if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
$warning['filename-bad-prefix'] = $prefix;
break;
}
}
# If the file existed before and was deleted, warn the user of this
# Don't bother doing so if the file exists now, however
if( $this->mLocalFile->wasDeleted() && !$this->mLocalFile->exists() )
$warning['filewasdeleted'] = $this->mLocalFile->getTitle();
return $warning;
}
/**
* Really perform the upload.
*/
function performUpload( $comment, $pageText, $watch, $user ) {
$status = $this->mLocalFile->upload( $this->mTempPath, $comment, $pageText,
File::DELETE_SOURCE, $this->mFileProps, false, $user );
if( $status->isGood() && $watch ) {
$user->addWatch( $this->mLocalFile->getTitle() );
}
if( $status->isGood() )
wfRunHooks( 'UploadComplete', array( &$this ) );
return $status;
}
/**
* Returns a title or null
*/
function getTitle() {
if ( $this->mTitle !== false )
return $this->mTitle;
/**
* Chop off any directories in the given filename. Then
* filter out illegal characters, and try to make a legible name
* out of it. We'll strip some silently that Title would die on.
*/
$basename = $this->mDesiredDestName;
$this->mFilteredName = wfStripIllegalFilenameChars( $basename );
/**
* We'll want to blacklist against *any* 'extension', and use
* only the final one for the whitelist.
*/
list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
if( count( $ext ) ) {
$this->mFinalExtension = $ext[count( $ext ) - 1];
} else {
$this->mFinalExtension = '';
}
/* Don't allow users to override the blacklist (check file extension) */
global $wgCheckFileExtensions, $wgStrictFileExtensions;
global $wgFileExtensions, $wgFileBlacklist;
if ( $this->mFinalExtension == '' ) {
$this->mTitleError = self::FILETYPE_MISSING;
return $this->mTitle = null;
} elseif ( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
( $wgCheckFileExtensions && $wgStrictFileExtensions &&
!$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) ) ) {
$this->mTitleError = self::FILETYPE_BADTYPE;
return $this->mTitle = null;
}
# If there was more than one "extension", reassemble the base
# filename to prevent bogus complaints about length
if( count( $ext ) > 1 ) {
for( $i = 0; $i < count( $ext ) - 1; $i++ )
$partname .= '.' . $ext[$i];
}
if( strlen( $partname ) < 1 ) {
$this->mTitleError = self::MIN_LENGTH_PARTNAME;
return $this->mTitle = null;
}
$nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
if( is_null( $nt ) ) {
$this->mTitleError = self::ILLEGAL_FILENAME;
return $this->mTitle = null;
}
return $this->mTitle = $nt;
}
function getLocalFile() {
if( is_null( $this->mLocalFile ) ) {
$nt = $this->getTitle();
$this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
}
return $this->mLocalFile;
}
/**
* Stash a file in a temporary directory for later processing
* after the user has confirmed it.
*
* If the user doesn't explicitly cancel or accept, these files
* can accumulate in the temp directory.
*
* @param string $saveName - the destination filename
* @param string $tempName - the source temporary file to save
* @return string - full path the stashed file, or false on failure
* @access private
*/
function saveTempUploadedFile( $saveName, $tempName ) {
global $wgOut;
$repo = RepoGroup::singleton()->getLocalRepo();
$status = $repo->storeTemp( $saveName, $tempName );
return $status;
}
/**
* Stash a file in a temporary directory for later processing,
* and save the necessary descriptive info into the session.
* Returns a key value which will be passed through a form
* to pick up the path info on a later invocation.
*
* @return int
* @access private
*/
function stashSession() {
$status = $this->saveTempUploadedFile( $this->mDestName, $this->mTempPath );
if( !$status->isGood() ) {
# Couldn't save the file.
return false;
}
return array(
'mTempPath' => $status->value,
'mFileSize' => $this->mFileSize,
'mFileProps' => $this->mFileProps,
'version' => self::SESSION_VERSION,
);
}
/**
* Remove a temporarily kept file stashed by saveTempUploadedFile().
* @return success
*/
function unsaveUploadedFile() {
$repo = RepoGroup::singleton()->getLocalRepo();
$success = $repo->freeTemp( $this->mTempPath );
return $success;
}
/**
* If we've modified the upload file we need to manually remove it
* on exit to clean up.
* @access private
*/
function cleanupTempFile() {
if ( $this->mRemoveTempFile && file_exists( $this->mTempPath ) ) {
wfDebug( __METHOD__.": Removing temporary file {$this->mTempPath}\n" );
unlink( $this->mTempPath );
}
}
function getTempPath() {
return $this->mTempPath;
}
/**
* Split a file into a base name and all dot-delimited 'extensions'
* on the end. Some web server configurations will fall back to
* earlier pseudo-'extensions' to determine type and execute
* scripts, so the blacklist needs to check them all.
*
* @return array
*/
function splitExtensions( $filename ) {
$bits = explode( '.', $filename );
$basename = array_shift( $bits );
return array( $basename, $bits );
}
/**
* Perform case-insensitive match against a list of file extensions.
* Returns true if the extension is in the list.
*
* @param string $ext
* @param array $list
* @return bool
*/
function checkFileExtension( $ext, $list ) {
return in_array( strtolower( $ext ), $list );
}
/**
* Perform case-insensitive match against a list of file extensions.
* Returns true if any of the extensions are in the list.
*
* @param array $ext
* @param array $list
* @return bool
*/
function checkFileExtensionList( $ext, $list ) {
foreach( $ext as $e ) {
if( in_array( strtolower( $e ), $list ) ) {
return true;
}
}
return false;
}
/**
* Checks if the mime type of the uploaded file matches the file extension.
*
* @param string $mime the mime type of the uploaded file
* @param string $extension The filename extension that the file is to be served with
* @return bool
*/
public static function verifyExtension( $mime, $extension ) {
$magic = MimeMagic::singleton();
if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
if ( ! $magic->isRecognizableExtension( $extension ) ) {
wfDebug( __METHOD__.": passing file with unknown detected mime type; " .
"unrecognized extension '$extension', can't verify\n" );
return true;
} else {
wfDebug( __METHOD__.": rejecting file with unknown detected mime type; ".
"recognized extension '$extension', so probably invalid file\n" );
return false;
}
$match= $magic->isMatchingExtension($extension,$mime);
if ($match===NULL) {
wfDebug( __METHOD__.": no file extension known for mime type $mime, passing file\n" );
return true;
} elseif ($match===true) {
wfDebug( __METHOD__.": mime type $mime matches extension $extension, passing file\n" );
#TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
return true;
} else {
wfDebug( __METHOD__.": mime type $mime mismatches file extension $extension, rejecting file\n" );
return false;
}
}
/**
* Heuristic for detecting files that *could* contain JavaScript instructions or
* things that may look like HTML to a browser and are thus
* potentially harmful. The present implementation will produce false positives in some situations.
*
* @param string $file Pathname to the temporary upload file
* @param string $mime The mime type of the file
* @param string $extension The extension of the file
* @return bool true if the file contains something looking like embedded scripts
*/
function detectScript($file, $mime, $extension) {
global $wgAllowTitlesInSVG;
#ugly hack: for text files, always look at the entire file.
#For binary field, just check the first K.
if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
else {
$fp = fopen( $file, 'rb' );
$chunk = fread( $fp, 1024 );
fclose( $fp );
}
$chunk= strtolower( $chunk );
if (!$chunk) return false;
#decode from UTF-16 if needed (could be used for obfuscation).
if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
else $enc= NULL;
if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
$chunk= trim($chunk);
#FIXME: convert from UTF-16 if necessarry!
wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
#check for HTML doctype
if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
/**
* Internet Explorer for Windows performs some really stupid file type
* autodetection which can cause it to interpret valid image files as HTML
* and potentially execute JavaScript, creating a cross-site scripting
* attack vectors.
*
* Apple's Safari browser also performs some unsafe file type autodetection
* which can cause legitimate files to be interpreted as HTML if the
* web server is not correctly configured to send the right content-type
* (or if you're really uploading plain text and octet streams!)
*
* Returns true if IE is likely to mistake the given file for HTML.
* Also returns true if Safari would mistake the given file for HTML
* when served with a generic content-type.
*/
$tags = array(
'<body',
'<head',
'<html', #also in safari
'<img',
'<pre',
'<script', #also in safari
'<table'
);
if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
$tags[] = '<title';
}
foreach( $tags as $tag ) {
if( false !== strpos( $chunk, $tag ) ) {
return true;
}
}
/*
* look for javascript
*/
#resolve entity-refs to look at attributes. may be harsh on big files... cache result?
$chunk = Sanitizer::decodeCharReferences( $chunk );
#look for script-types
if (preg_match('!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim',$chunk)) return true;
#look for html-style script-urls
if (preg_match('!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
#look for css-style script-urls
if (preg_match('!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
wfDebug("SpecialUpload::detectScript: no scripts found\n");
return false;
}
/**
* Generic wrapper function for a virus scanner program.
* This relies on the $wgAntivirus and $wgAntivirusSetup variables.
* $wgAntivirusRequired may be used to deny upload if the scan fails.
*
* @param string $file Pathname to the temporary upload file
* @return mixed false if not virus is found, NULL if the scan fails or is disabled,
* or a string containing feedback from the virus scanner if a virus was found.
* If textual feedback is missing but a virus was found, this function returns true.
*/
function detectVirus($file) {
global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
if ( !$wgAntivirus ) {
wfDebug( __METHOD__.": virus scanner disabled\n");
return NULL;
}
if ( !$wgAntivirusSetup[$wgAntivirus] ) {
wfDebug( __METHOD__.": unknown virus scanner: $wgAntivirus\n" );
$wgOut->wrapWikiMsg( '<div class="error">$1</div>', array( 'virus-badscanner', $wgAntivirus ) );
return wfMsg('virus-unknownscanner') . " $wgAntivirus";
}
# look up scanner configuration
$command = $wgAntivirusSetup[$wgAntivirus]["command"];
$exitCodeMap = $wgAntivirusSetup[$wgAntivirus]["codemap"];
$msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]["messagepattern"] ) ?
$wgAntivirusSetup[$wgAntivirus]["messagepattern"] : null;
if ( strpos( $command,"%f" ) === false ) {
# simple pattern: append file to scan
$command .= " " . wfEscapeShellArg( $file );
} else {
# complex pattern: replace "%f" with file to scan
$command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
}
wfDebug( __METHOD__.": running virus scan: $command \n" );
# execute virus scanner
$exitCode = false;
#NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
# that does not seem to be worth the pain.
# Ask me (Duesentrieb) about it if it's ever needed.
$output = array();
if ( wfIsWindows() ) {
exec( "$command", $output, $exitCode );
} else {
exec( "$command 2>&1", $output, $exitCode );
}
# map exit code to AV_xxx constants.
$mappedCode = $exitCode;
if ( $exitCodeMap ) {
if ( isset( $exitCodeMap[$exitCode] ) ) {
$mappedCode = $exitCodeMap[$exitCode];
} elseif ( isset( $exitCodeMap["*"] ) ) {
$mappedCode = $exitCodeMap["*"];
}
}
if ( $mappedCode === AV_SCAN_FAILED ) {
# scan failed (code was mapped to false by $exitCodeMap)
wfDebug( __METHOD__.": failed to scan $file (code $exitCode).\n" );
if ( $wgAntivirusRequired ) {
return wfMsg('virus-scanfailed', array( $exitCode ) );
} else {
return NULL;
}
} else if ( $mappedCode === AV_SCAN_ABORTED ) {
# scan failed because filetype is unknown (probably imune)
wfDebug( __METHOD__.": unsupported file type $file (code $exitCode).\n" );
return NULL;
} else if ( $mappedCode === AV_NO_VIRUS ) {
# no virus found
wfDebug( __METHOD__.": file passed virus scan.\n" );
return false;
} else {
$output = join( "\n", $output );
$output = trim( $output );
if ( !$output ) {
$output = true; #if there's no output, return true
} elseif ( $msgPattern ) {
$groups = array();
if ( preg_match( $msgPattern, $output, $groups ) ) {
if ( $groups[1] ) {
$output = $groups[1];
}
}
}
wfDebug( __METHOD__.": FOUND VIRUS! scanner feedback: $output" );
return $output;
}
}
/**
* Check if the temporary file is MacBinary-encoded, as some uploads
* from Internet Explorer on Mac OS Classic and Mac OS X will be.
* If so, the data fork will be extracted to a second temporary file,
* which will then be checked for validity and either kept or discarded.
*
* @access private
*/
function checkMacBinary() {
$macbin = new MacBinary( $this->mTempPath );
if( $macbin->isValid() ) {
$dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
$dataHandle = fopen( $dataFile, 'wb' );
wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
$macbin->extractData( $dataHandle );
$this->mTempPath = $dataFile;
$this->mFileSize = $macbin->dataForkLength();
// We'll have to manually remove the new file if it's not kept.
$this->mRemoveTempFile = true;
}
$macbin->close();
}
/**
* Check if there's an overwrite conflict and, if so, if restrictions
* forbid this user from performing the upload.
*
* @return mixed true on success, WikiError on failure
* @access private
*/
function checkOverwrite() {
global $wgUser;
// First check whether the local file can be overwritten
if( $this->mLocalFile->exists() )
if( !self::userCanReUpload( $wgUser, $this->mLocalFile ) )
return 'fileexists-forbidden';
// Check shared conflicts
$file = wfFindFile( $this->mLocalFile->getName() );
if ( $file && ( !$wgUser->isAllowed( 'reupload' ) ||
!$wgUser->isAllowed( 'reupload-shared' ) ) )
return 'fileexists-shared-forbidden';
return true;
}
/**
* Check if a user is the last uploader
*
* @param User $user
* @param string $img, image name
* @return bool
*/
public static function userCanReUpload( User $user, $img ) {
if( $user->isAllowed( 'reupload' ) )
return true; // non-conditional
if( !$user->isAllowed( 'reupload-own' ) )
return false;
if( is_string( $img ) )
$img = wfLocalFile( $img );
if ( !( $img instanceof LocalFile ) )
return false;
return $user->getId() == $img->getUser( 'id' );
}
public static function getExistsWarning( $file ) {
if( $file->exists() )
return array( 'exists', $file );
if( $file->getTitle()->getArticleID() )
return array( 'page-exists', $file );
if( strpos( $file->getName(), '.' ) == false ) {
$partname = $file->getName();
$rawExtension = '';
} else {
$n = strrpos( $file->getName(), '.' );
$rawExtension = substr( $file->getName(), $n + 1 );
$partname = substr( $file->getName(), 0, $n );
}
if ( $rawExtension != $file->getExtension() ) {
// We're not using the normalized form of the extension.
// Normal form is lowercase, using most common of alternate
// extensions (eg 'jpg' rather than 'JPEG').
//
// Check for another file using the normalized form...
$nt_lc = Title::makeTitle( NS_FILE, $partname . '.' . $file->getExtension() );
$file_lc = wfLocalFile( $nt_lc );
if( $file_lc->exists() )
return array( 'exists-normalized', $file_lc );
}
if ( self::isThumbName( $file->getName() ) ) {
# Check for filenames like 50px- or 180px-, these are mostly thumbnails
$nt_thb = Title::newFromText( substr( $partname , strpos( $partname , '-' ) +1 ) . '.' . $rawExtension );
$file_thb = wfLocalFile( $nt_thb );
if( $file_thb->exists() )
return array( 'thumb', $file_thb );
}
return false;
}
public static function isThumbName( $filename ) {
$n = strrpos( $filename, '.' );
$partname = $n ? substr( $filename, 0, $n ) : $filename;
return (
substr( $partname , 3, 3 ) == 'px-' ||
substr( $partname , 2, 3 ) == 'px-'
) &&
ereg( "[0-9]{2}" , substr( $partname , 0, 2) );
}
/**
* Get a list of blacklisted filename prefixes from [[MediaWiki:filename-prefix-blacklist]]
*
* @return array list of prefixes
*/
public static function getFilenamePrefixBlacklist() {
$blacklist = array();
$message = wfMsgForContent( 'filename-prefix-blacklist' );
if( $message && !( wfEmptyMsg( 'filename-prefix-blacklist', $message ) || $message == '-' ) ) {
$lines = explode( "\n", $message );
foreach( $lines as $line ) {
// Remove comment lines
$comment = substr( trim( $line ), 0, 1 );
if ( $comment == '#' || $comment == '' ) {
continue;
}
// Remove additional comments after a prefix
$comment = strpos( $line, '#' );
if ( $comment > 0 ) {
$line = substr( $line, 0, $comment-1 );
}
$blacklist[] = trim( $line );
}
}
return $blacklist;
}
}