FM / redbladewiki

/home/kinichie/.trash/redbladewiki

Name	Size	Mode	Actions
.htpasswds/	-	0750	rm
.well-known/	-	0755	rm
bin/	-	0755	rm
cache/	-	0755	rm
cgi-bin/	-	0755	rm
docs/	-	0755	rm
extensions/	-	0755	rm
images/	-	0777	rm
includes/	-	0777	rm
languages/	-	0755	rm
maintenance/	-	0755	rm
mw-config/	-	0755	rm
resources/	-	0755	rm
serialized/	-	0755	rm
skins/	-	0755	rm
tests/	-	0755	rm
vendor/	-	0755	rm
.gitreview	111	0644	edit dl rm
.htaccess	281	0644	edit dl rm
.jshintignore	774	0644	edit dl rm
.jshintrc	305	0644	edit dl rm
api.php	4697	0644	edit dl rm
api.php5	933	0644	edit dl rm
autoload.php	136895	0644	edit dl rm
CODE_OF_CONDUCT.md	116	0644	edit dl rm
composer-example.json	506	0644	edit dl rm
composer.json	3611	0644	edit dl rm
composer.local.json-sample	102	0644	edit dl rm
COPYING	19421	0644	edit dl rm
CREDITS	11526	0644	edit dl rm
error_log	4226	0644	edit dl rm
FAQ	95	0644	edit dl rm
favicon.ico	5234	0644	edit dl rm
Gruntfile.js	3499	0644	edit dl rm
HISTORY	888845	0644	edit dl rm
img_auth.php	7705	0644	edit dl rm
img_auth.php5	943	0644	edit dl rm
index.php	1579	0644	edit dl rm
index.php5	937	0644	edit dl rm
INSTALL	3681	0644	edit dl rm
jsduck.json	2042	0644	edit dl rm
load.php	1950	0644	edit dl rm
load.php5	935	0644	edit dl rm
LocalSettings.php	4664	0644	edit dl rm
opensearch_desc.php	4059	0644	edit dl rm
opensearch_desc.php5	957	0644	edit dl rm
profileinfo.php	12026	0644	edit dl rm
profileinfo.php5	949	0644	edit dl rm
README	1529	0644	edit dl rm
README.mediawiki	1482	0644	edit dl rm
redirect.php	1258	0644	edit dl rm
redirect.php5	927	0644	edit dl rm
redirect.phtml	89	0644	edit dl rm
RELEASE-NOTES-1.20	25066	0644	edit dl rm
RELEASE-NOTES-1.23	30416	0644	edit dl rm
RELEASE-NOTES-1.31	27819	0644	edit dl rm
SECURITY	199	0644	edit dl rm
StartProfiler.sample	1703	0644	edit dl rm
thumb.php	22633	0644	edit dl rm
thumb.php5	955	0644	edit dl rm
thumb_handler.php	1087	0644	edit dl rm
thumb_handler.php5	971	0644	edit dl rm
UPGRADE	12247	0644	edit dl rm
wiki.phtml	98	0644	edit dl rm

Edit: /home/kinichie/.trash/redbladewiki/thumb.php (22633B)

<?php
/**
 * PHP script to stream out an image thumbnail.
 *
 * 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 Media
 */

use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;

define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
require __DIR__ . '/includes/WebStart.php';

// Don't use fancy MIME detection, just check the file extension for jpg/gif/png
$wgTrivialMimeDetection = true;

if ( defined( 'THUMB_HANDLER' ) ) {
	// Called from thumb_handler.php via 404; extract params from the URI...
	wfThumbHandle404();
} else {
	// Called directly, use $_GET params
	wfStreamThumb( $_GET );
}

$mediawiki = new MediaWiki();
$mediawiki->doPostOutputShutdown( 'fast' );

// --------------------------------------------------------------------------

/**
 * Handle a thumbnail request via thumbnail file URL
 *
 * @return void
 */
function wfThumbHandle404() {
	global $wgArticlePath;

# Set action base paths so that WebRequest::getPathInfo()
	# recognizes the "X" as the 'title' in ../thumb_handler.php/X urls.
	# Note: If Custom per-extension repo paths are set, this may break.
	$repo = RepoGroup::singleton()->getLocalRepo();
	$oldArticlePath = $wgArticlePath;
	$wgArticlePath = $repo->getZoneUrl( 'thumb' ) . '/$1';

$matches = WebRequest::getPathInfo();

$wgArticlePath = $oldArticlePath;

if ( !isset( $matches['title'] ) ) {
		wfThumbError( 404, 'Could not determine the name of the requested thumbnail.' );
		return;
	}

$params = wfExtractThumbRequestInfo( $matches['title'] ); // basic wiki URL param extracting
	if ( $params == null ) {
		wfThumbError( 400, 'The specified thumbnail parameters are not recognized.' );
		return;
	}

wfStreamThumb( $params ); // stream the thumbnail
}

/**
 * Stream a thumbnail specified by parameters
 *
 * @param array $params List of thumbnailing parameters. In addition to parameters
 *  passed to the MediaHandler, this may also includes the keys:
 *   f (for filename), archived (if archived file), temp (if temp file),
 *   w (alias for width), p (alias for page), r (ignored; historical),
 *   rel404 (path for render on 404 to verify hash path correct),
 *   thumbName (thumbnail name to potentially extract more parameters from
 *   e.g. 'lossy-page1-120px-Foo.tiff' would add page, lossy and width
 *   to the parameters)
 * @return void
 */
function wfStreamThumb( array $params ) {
	global $wgVaryOnXFP;

$headers = []; // HTTP headers to send

$fileName = isset( $params['f'] ) ? $params['f'] : '';

// Backwards compatibility parameters
	if ( isset( $params['w'] ) ) {
		$params['width'] = $params['w'];
		unset( $params['w'] );
	}
	if ( isset( $params['width'] ) && substr( $params['width'], -2 ) == 'px' ) {
		// strip the px (pixel) suffix, if found
		$params['width'] = substr( $params['width'], 0, -2 );
	}
	if ( isset( $params['p'] ) ) {
		$params['page'] = $params['p'];
	}

// Is this a thumb of an archived file?
	$isOld = ( isset( $params['archived'] ) && $params['archived'] );
	unset( $params['archived'] ); // handlers don't care

// Is this a thumb of a temp file?
	$isTemp = ( isset( $params['temp'] ) && $params['temp'] );
	unset( $params['temp'] ); // handlers don't care

// Some basic input validation
	$fileName = strtr( $fileName, '\\/', '__' );

// Actually fetch the image. Method depends on whether it is archived or not.
	if ( $isTemp ) {
		$repo = RepoGroup::singleton()->getLocalRepo()->getTempRepo();
		$img = new UnregisteredLocalFile( null, $repo,
			# Temp files are hashed based on the name without the timestamp.
			# The thumbnails will be hashed based on the entire name however.
			# @todo fix this convention to actually be reasonable.
			$repo->getZonePath( 'public' ) . '/' . $repo->getTempHashPath( $fileName ) . $fileName
		);
	} elseif ( $isOld ) {
		// Format is <timestamp>!<name>
		$bits = explode( '!', $fileName, 2 );
		if ( count( $bits ) != 2 ) {
			wfThumbError( 404, wfMessage( 'badtitletext' )->parse() );
			return;
		}
		$title = Title::makeTitleSafe( NS_FILE, $bits[1] );
		if ( !$title ) {
			wfThumbError( 404, wfMessage( 'badtitletext' )->parse() );
			return;
		}
		$img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName );
	} else {
		$img = wfLocalFile( $fileName );
	}

// Check the source file title
	if ( !$img ) {
		wfThumbError( 404, wfMessage( 'badtitletext' )->parse() );
		return;
	}

// Check permissions if there are read restrictions
	$varyHeader = [];
	if ( !in_array( 'read', User::getGroupPermissions( [ '*' ] ), true ) ) {
		if ( !$img->getTitle() || !$img->getTitle()->userCan( 'read' ) ) {
			wfThumbError( 403, 'Access denied. You do not have permission to access ' .
				'the source file.' );
			return;
		}
		$headers[] = 'Cache-Control: private';
		$varyHeader[] = 'Cookie';
	}

// Check if the file is hidden
	if ( $img->isDeleted( File::DELETED_FILE ) ) {
		wfThumbErrorText( 404, "The source file '$fileName' does not exist." );
		return;
	}

// Do rendering parameters extraction from thumbnail name.
	if ( isset( $params['thumbName'] ) ) {
		$params = wfExtractThumbParams( $img, $params );
	}
	if ( $params == null ) {
		wfThumbError( 400, 'The specified thumbnail parameters are not recognized.' );
		return;
	}

// Check the source file storage path
	if ( !$img->exists() ) {
		$redirectedLocation = false;
		if ( !$isTemp ) {
			// Check for file redirect
			// Since redirects are associated with pages, not versions of files,
			// we look for the most current version to see if its a redirect.
			$possRedirFile = RepoGroup::singleton()->getLocalRepo()->findFile( $img->getName() );
			if ( $possRedirFile && !is_null( $possRedirFile->getRedirected() ) ) {
				$redirTarget = $possRedirFile->getName();
				$targetFile = wfLocalFile( Title::makeTitleSafe( NS_FILE, $redirTarget ) );
				if ( $targetFile->exists() ) {
					$newThumbName = $targetFile->thumbName( $params );
					if ( $isOld ) {
						/** @var array $bits */
						$newThumbUrl = $targetFile->getArchiveThumbUrl(
							$bits[0] . '!' . $targetFile->getName(), $newThumbName );
					} else {
						$newThumbUrl = $targetFile->getThumbUrl( $newThumbName );
					}
					$redirectedLocation = wfExpandUrl( $newThumbUrl, PROTO_CURRENT );
				}
			}
		}

if ( $redirectedLocation ) {
			// File has been moved. Give redirect.
			$response = RequestContext::getMain()->getRequest()->response();
			$response->statusHeader( 302 );
			$response->header( 'Location: ' . $redirectedLocation );
			$response->header( 'Expires: ' .
				gmdate( 'D, d M Y H:i:s', time() + 12 * 3600 ) . ' GMT' );
			if ( $wgVaryOnXFP ) {
				$varyHeader[] = 'X-Forwarded-Proto';
			}
			if ( count( $varyHeader ) ) {
				$response->header( 'Vary: ' . implode( ', ', $varyHeader ) );
			}
			$response->header( 'Content-Length: 0' );
			return;
		}

// If its not a redirect that has a target as a local file, give 404.
		wfThumbErrorText( 404, "The source file '$fileName' does not exist." );
		return;
	} elseif ( $img->getPath() === false ) {
		wfThumbErrorText( 400, "The source file '$fileName' is not locally accessible." );
		return;
	}

// Check IMS against the source file
	// This means that clients can keep a cached copy even after it has been deleted on the server
	if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
		// Fix IE brokenness
		$imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
		// Calculate time
		Wikimedia\suppressWarnings();
		$imsUnix = strtotime( $imsString );
		Wikimedia\restoreWarnings();
		if ( wfTimestamp( TS_UNIX, $img->getTimestamp() ) <= $imsUnix ) {
			HttpStatus::header( 304 );
			return;
		}
	}

$rel404 = isset( $params['rel404'] ) ? $params['rel404'] : null;
	unset( $params['r'] ); // ignore 'r' because we unconditionally pass File::RENDER
	unset( $params['f'] ); // We're done with 'f' parameter.
	unset( $params['rel404'] ); // moved to $rel404

// Get the normalized thumbnail name from the parameters...
	try {
		$thumbName = $img->thumbName( $params );
		if ( !strlen( $thumbName ) ) { // invalid params?
			throw new MediaTransformInvalidParametersException(
				'Empty return from File::thumbName'
			);
		}
		$thumbName2 = $img->thumbName( $params, File::THUMB_FULL_NAME ); // b/c; "long" style
	} catch ( MediaTransformInvalidParametersException $e ) {
		wfThumbError(
			400,
			'The specified thumbnail parameters are not valid: ' . $e->getMessage()
		);
		return;
	} catch ( MWException $e ) {
		wfThumbError( 500, $e->getHTML(), 'Exception caught while extracting thumb name',
			[ 'exception' => $e ] );
		return;
	}

// For 404 handled thumbnails, we only use the base name of the URI
	// for the thumb params and the parent directory for the source file name.
	// Check that the zone relative path matches up so squid caches won't pick
	// up thumbs that would not be purged on source file deletion (T36231).
	if ( $rel404 !== null ) { // thumbnail was handled via 404
		if ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName ) ) {
			// Request for the canonical thumbnail name
		} elseif ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName2 ) ) {
			// Request for the "long" thumbnail name; redirect to canonical name
			$response = RequestContext::getMain()->getRequest()->response();
			$response->statusHeader( 301 );
			$response->header( 'Location: ' .
				wfExpandUrl( $img->getThumbUrl( $thumbName ), PROTO_CURRENT ) );
			$response->header( 'Expires: ' .
				gmdate( 'D, d M Y H:i:s', time() + 7 * 86400 ) . ' GMT' );
			if ( $wgVaryOnXFP ) {
				$varyHeader[] = 'X-Forwarded-Proto';
			}
			if ( count( $varyHeader ) ) {
				$response->header( 'Vary: ' . implode( ', ', $varyHeader ) );
			}
			return;
		} else {
			wfThumbErrorText( 404, "The given path of the specified thumbnail is incorrect;
				expected '" . $img->getThumbRel( $thumbName ) . "' but got '" .
				rawurldecode( $rel404 ) . "'." );
			return;
		}
	}

$dispositionType = isset( $params['download'] ) ? 'attachment' : 'inline';

// Suggest a good name for users downloading this thumbnail
	$headers[] =
		"Content-Disposition: {$img->getThumbDisposition( $thumbName, $dispositionType )}";

if ( count( $varyHeader ) ) {
		$headers[] = 'Vary: ' . implode( ', ', $varyHeader );
	}

// Stream the file if it exists already...
	$thumbPath = $img->getThumbPath( $thumbName );
	if ( $img->getRepo()->fileExists( $thumbPath ) ) {
		$starttime = microtime( true );
		$status = $img->getRepo()->streamFileWithStatus( $thumbPath, $headers );
		$streamtime = microtime( true ) - $starttime;

if ( $status->isOK() ) {
			MediaWikiServices::getInstance()->getStatsdDataFactory()->timing(
				'media.thumbnail.stream', $streamtime
			);
		} else {
			wfThumbError( 500, 'Could not stream the file', null, [ 'file' => $thumbName,
				'path' => $thumbPath, 'error' => $status->getWikiText( false, false, 'en' ) ] );
		}
		return;
	}

$user = RequestContext::getMain()->getUser();
	if ( !wfThumbIsStandard( $img, $params ) && $user->pingLimiter( 'renderfile-nonstandard' ) ) {
		wfThumbError( 429, wfMessage( 'actionthrottledtext' )->parse() );
		return;
	} elseif ( $user->pingLimiter( 'renderfile' ) ) {
		wfThumbError( 429, wfMessage( 'actionthrottledtext' )->parse() );
		return;
	}

$thumbProxyUrl = $img->getRepo()->getThumbProxyUrl();

if ( strlen( $thumbProxyUrl ) ) {
		wfProxyThumbnailRequest( $img, $thumbName );
		// No local fallback when in proxy mode
		return;
	} else {
		// Generate the thumbnail locally
		list( $thumb, $errorMsg ) = wfGenerateThumbnail( $img, $params, $thumbName, $thumbPath );
	}

/** @var MediaTransformOutput|MediaTransformError|bool $thumb */

// Check for thumbnail generation errors...
	$msg = wfMessage( 'thumbnail_error' );
	$errorCode = 500;

if ( !$thumb ) {
		$errorMsg = $errorMsg ?: $msg->rawParams( 'File::transform() returned false' )->escaped();
		if ( $errorMsg instanceof MessageSpecifier &&
			$errorMsg->getKey() === 'thumbnail_image-failure-limit'
		) {
			$errorCode = 429;
		}
	} elseif ( $thumb->isError() ) {
		$errorMsg = $thumb->getHtmlMsg();
		$errorCode = $thumb->getHttpStatusCode();
	} elseif ( !$thumb->hasFile() ) {
		$errorMsg = $msg->rawParams( 'No path supplied in thumbnail object' )->escaped();
	} elseif ( $thumb->fileIsSource() ) {
		$errorMsg = $msg
			->rawParams( 'Image was not scaled, is the requested width bigger than the source?' )
			->escaped();
		$errorCode = 400;
	}

if ( $errorMsg !== false ) {
		wfThumbError( $errorCode, $errorMsg, null, [ 'file' => $thumbName, 'path' => $thumbPath ] );
	} else {
		// Stream the file if there were no errors
		$status = $thumb->streamFileWithStatus( $headers );
		if ( !$status->isOK() ) {
			wfThumbError( 500, 'Could not stream the file', null, [
				'file' => $thumbName, 'path' => $thumbPath,
				'error' => $status->getWikiText( false, false, 'en' ) ] );
		}
	}
}

/**
 * Proxies thumbnail request to a service that handles thumbnailing
 *
 * @param File $img
 * @param string $thumbName
 */
function wfProxyThumbnailRequest( $img, $thumbName ) {
	$thumbProxyUrl = $img->getRepo()->getThumbProxyUrl();

// Instead of generating the thumbnail ourselves, we proxy the request to another service
	$thumbProxiedUrl = $thumbProxyUrl . $img->getThumbRel( $thumbName );

$req = MWHttpRequest::factory( $thumbProxiedUrl );
	$secret = $img->getRepo()->getThumbProxySecret();

// Pass a secret key shared with the proxied service if any
	if ( strlen( $secret ) ) {
		$req->setHeader( 'X-Swift-Secret', $secret );
	}

// Send request to proxied service
	$status = $req->execute();

// Simply serve the response from the proxied service as-is
	header( 'HTTP/1.1 ' . $req->getStatus() );

$headers = $req->getResponseHeaders();

foreach ( $headers as $key => $values ) {
		foreach ( $values as $value ) {
			header( $key . ': ' . $value, false );
		}
	}

echo $req->getContent();
}

/**
 * Actually try to generate a new thumbnail
 *
 * @param File $file
 * @param array $params
 * @param string $thumbName
 * @param string $thumbPath
 * @return array (MediaTransformOutput|bool, string|bool error message HTML)
 */
function wfGenerateThumbnail( File $file, array $params, $thumbName, $thumbPath ) {
	global $wgAttemptFailureEpoch;

$cache = ObjectCache::getLocalClusterInstance();
	$key = $cache->makeKey(
		'attempt-failures',
		$wgAttemptFailureEpoch,
		$file->getRepo()->getName(),
		$file->getSha1(),
		md5( $thumbName )
	);

// Check if this file keeps failing to render
	if ( $cache->get( $key ) >= 4 ) {
		return [ false, wfMessage( 'thumbnail_image-failure-limit', 4 ) ];
	}

$done = false;
	// Record failures on PHP fatals in addition to caching exceptions
	register_shutdown_function( function () use ( $cache, &$done, $key ) {
		if ( !$done ) { // transform() gave a fatal
			// Randomize TTL to reduce stampedes
			$cache->incrWithInit( $key, $cache::TTL_HOUR + mt_rand( 0, 300 ) );
		}
	} );

$thumb = false;
	$errorHtml = false;

// guard thumbnail rendering with PoolCounter to avoid stampedes
	// expensive files use a separate PoolCounter config so it is possible
	// to set up a global limit on them
	if ( $file->isExpensiveToThumbnail() ) {
		$poolCounterType = 'FileRenderExpensive';
	} else {
		$poolCounterType = 'FileRender';
	}

// Thumbnail isn't already there, so create the new thumbnail...
	try {
		$work = new PoolCounterWorkViaCallback( $poolCounterType, sha1( $file->getName() ),
			[
				'doWork' => function () use ( $file, $params ) {
					return $file->transform( $params, File::RENDER_NOW );
				},
				'doCachedWork' => function () use ( $file, $params, $thumbPath ) {
					// If the worker that finished made this thumbnail then use it.
					// Otherwise, it probably made a different thumbnail for this file.
					return $file->getRepo()->fileExists( $thumbPath )
						? $file->transform( $params, File::RENDER_NOW )
						: false; // retry once more in exclusive mode
				},
				'error' => function ( Status $status ) {
					return wfMessage( 'generic-pool-error' )->parse() . '<hr>' . $status->getHTML();
				}
			]
		);
		$result = $work->execute();
		if ( $result instanceof MediaTransformOutput ) {
			$thumb = $result;
		} elseif ( is_string( $result ) ) { // error
			$errorHtml = $result;
		}
	} catch ( Exception $e ) {
		// Tried to select a page on a non-paged file?
	}

/** @noinspection PhpUnusedLocalVariableInspection */
	$done = true; // no PHP fatal occured

if ( !$thumb || $thumb->isError() ) {
		// Randomize TTL to reduce stampedes
		$cache->incrWithInit( $key, $cache::TTL_HOUR + mt_rand( 0, 300 ) );
	}

return [ $thumb, $errorHtml ];
}

/**
 * Convert pathinfo type parameter, into normal request parameters
 *
 * So for example, if the request was redirected from
 * /w/images/thumb/a/ab/Foo.png/120px-Foo.png. The $thumbRel parameter
 * of this function would be set to "a/ab/Foo.png/120px-Foo.png".
 * This method is responsible for turning that into an array
 * with the folowing keys:
 *  * f => the filename (Foo.png)
 *  * rel404 => the whole thing (a/ab/Foo.png/120px-Foo.png)
 *  * archived => 1 (If the request is for an archived thumb)
 *  * temp => 1 (If the file is in the "temporary" zone)
 *  * thumbName => the thumbnail name, including parameters (120px-Foo.png)
 *
 * Transform specific parameters are set later via wfExtractThumbParams().
 *
 * @param string $thumbRel Thumbnail path relative to the thumb zone
 * @return array|null Associative params array or null
 */
function wfExtractThumbRequestInfo( $thumbRel ) {
	$repo = RepoGroup::singleton()->getLocalRepo();

$hashDirReg = $subdirReg = '';
	$hashLevels = $repo->getHashLevels();
	for ( $i = 0; $i < $hashLevels; $i++ ) {
		$subdirReg .= '[0-9a-f]';
		$hashDirReg .= "$subdirReg/";
	}

// Check if this is a thumbnail of an original in the local file repo
	if ( preg_match( "!^((archive/)?$hashDirReg([^/]*)/([^/]*))$!", $thumbRel, $m ) ) {
		list( /*all*/, $rel, $archOrTemp, $filename, $thumbname ) = $m;
	// Check if this is a thumbnail of an temp file in the local file repo
	} elseif ( preg_match( "!^(temp/)($hashDirReg([^/]*)/([^/]*))$!", $thumbRel, $m ) ) {
		list( /*all*/, $archOrTemp, $rel, $filename, $thumbname ) = $m;
	} else {
		return null; // not a valid looking thumbnail request
	}

$params = [ 'f' => $filename, 'rel404' => $rel ];
	if ( $archOrTemp === 'archive/' ) {
		$params['archived'] = 1;
	} elseif ( $archOrTemp === 'temp/' ) {
		$params['temp'] = 1;
	}

$params['thumbName'] = $thumbname;
	return $params;
}

/**
 * Convert a thumbnail name (122px-foo.png) to parameters, using
 * file handler.
 *
 * @param File $file File object for file in question
 * @param array $params Array of parameters so far
 * @return array Parameters array with more parameters
 */
function wfExtractThumbParams( $file, $params ) {
	if ( !isset( $params['thumbName'] ) ) {
		throw new InvalidArgumentException( "No thumbnail name passed to wfExtractThumbParams" );
	}

$thumbname = $params['thumbName'];
	unset( $params['thumbName'] );

// FIXME: Files in the temp zone don't set a MIME type, which means
	// they don't have a handler. Which means we can't parse the param
	// string. However, not a big issue as what good is a param string
	// if you have no handler to make use of the param string and
	// actually generate the thumbnail.
	$handler = $file->getHandler();

// Based on UploadStash::parseKey
	$fileNamePos = strrpos( $thumbname, $params['f'] );
	if ( $fileNamePos === false ) {
		// Maybe using a short filename? (see FileRepo::nameForThumb)
		$fileNamePos = strrpos( $thumbname, 'thumbnail' );
	}

if ( $handler && $fileNamePos !== false ) {
		$paramString = substr( $thumbname, 0, $fileNamePos - 1 );
		$extraParams = $handler->parseParamString( $paramString );
		if ( $extraParams !== false ) {
			return $params + $extraParams;
		}
	}

// As a last ditch fallback, use the traditional common parameters
	if ( preg_match( '!^(page(\d*)-)*(\d*)px-[^/]*$!', $thumbname, $matches ) ) {
		list( /* all */, /* pagefull */, $pagenum, $size ) = $matches;
		$params['width'] = $size;
		if ( $pagenum ) {
			$params['page'] = $pagenum;
		}
		return $params; // valid thumbnail URL
	}
	return null;
}

/**
 * Output a thumbnail generation error message
 *
 * @param int $status
 * @param string $msgText Plain text (will be html escaped)
 * @return void
 */
function wfThumbErrorText( $status, $msgText ) {
	wfThumbError( $status, htmlspecialchars( $msgText, ENT_NOQUOTES ) );
}

/**
 * Output a thumbnail generation error message
 *
 * @param int $status
 * @param string $msgHtml HTML
 * @param string $msgText Short error description, for internal logging. Defaults to $msgHtml.
 *   Only used for HTTP 500 errors.
 * @param array $context Error context, for internal logging. Only used for HTTP 500 errors.
 * @return void
 */
function wfThumbError( $status, $msgHtml, $msgText = null, $context = [] ) {
	global $wgShowHostnames;

header( 'Cache-Control: no-cache' );
	header( 'Content-Type: text/html; charset=utf-8' );
	if ( $status == 400 || $status == 404 || $status == 429 ) {
		HttpStatus::header( $status );
	} elseif ( $status == 403 ) {
		HttpStatus::header( 403 );
		header( 'Vary: Cookie' );
	} else {
		LoggerFactory::getInstance( 'thumb' )->error( $msgText ?: $msgHtml, $context );
		HttpStatus::header( 500 );
	}
	if ( $wgShowHostnames ) {
		header( 'X-MW-Thumbnail-Renderer: ' . wfHostname() );
		$url = htmlspecialchars(
			isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '',
			ENT_NOQUOTES
		);
		$hostname = htmlspecialchars( wfHostname(), ENT_NOQUOTES );
		$debug = "\n\n";
	} else {
		$debug = '';
	}
	$content = <<<EOT
<!DOCTYPE html>
<html><head>
<meta charset="UTF-8" />
<title>Error generating thumbnail</title>
</head>
<body>
<h1>Error generating thumbnail</h1>
<p>
$msgHtml
</p>
$debug
</body>
</html>

EOT;
	header( 'Content-Length: ' . strlen( $content ) );
	echo $content;
}

cmd: