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https://github.com/YunoHost-Apps/mediawiki_ynh.git
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393 lines
14 KiB
PHP
393 lines
14 KiB
PHP
<?php
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/**
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* Implements Special:UploadStash.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup SpecialPage
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* @ingroup Upload
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*/
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/**
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* Web access for files temporarily stored by UploadStash.
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*
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* For example -- files that were uploaded with the UploadWizard extension are stored temporarily
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* before committing them to the db. But we want to see their thumbnails and get other information
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* about them.
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*
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* Since this is based on the user's session, in effect this creates a private temporary file area.
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* However, the URLs for the files cannot be shared.
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*/
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class SpecialUploadStash extends UnlistedSpecialPage {
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// UploadStash
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private $stash;
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// Since we are directly writing the file to STDOUT,
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// we should not be reading in really big files and serving them out.
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//
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// We also don't want people using this as a file drop, even if they
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// share credentials.
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//
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// This service is really for thumbnails and other such previews while
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// uploading.
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const MAX_SERVE_BYTES = 1048576; // 1MB
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public function __construct() {
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parent::__construct( 'UploadStash', 'upload' );
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try {
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$this->stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash();
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} catch ( UploadStashNotAvailableException $e ) {
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}
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}
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/**
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* Execute page -- can output a file directly or show a listing of them.
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*
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* @param string $subPage subpage, e.g. in http://example.com/wiki/Special:UploadStash/foo.jpg, the "foo.jpg" part
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* @return Boolean: success
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*/
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public function execute( $subPage ) {
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$this->checkPermissions();
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if ( $subPage === null || $subPage === '' ) {
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return $this->showUploads();
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}
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return $this->showUpload( $subPage );
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}
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/**
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* If file available in stash, cats it out to the client as a simple HTTP response.
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* n.b. Most sanity checking done in UploadStashLocalFile, so this is straightforward.
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*
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* @param string $key the key of a particular requested file
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* @throws HttpError
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* @return bool
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*/
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public function showUpload( $key ) {
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// prevent callers from doing standard HTML output -- we'll take it from here
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$this->getOutput()->disable();
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try {
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$params = $this->parseKey( $key );
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if ( $params['type'] === 'thumb' ) {
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return $this->outputThumbFromStash( $params['file'], $params['params'] );
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} else {
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return $this->outputLocalFile( $params['file'] );
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}
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} catch ( UploadStashFileNotFoundException $e ) {
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$code = 404;
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$message = $e->getMessage();
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} catch ( UploadStashZeroLengthFileException $e ) {
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$code = 500;
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$message = $e->getMessage();
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} catch ( UploadStashBadPathException $e ) {
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$code = 500;
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$message = $e->getMessage();
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} catch ( SpecialUploadStashTooLargeException $e ) {
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$code = 500;
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$message = 'Cannot serve a file larger than ' . self::MAX_SERVE_BYTES . ' bytes. ' . $e->getMessage();
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} catch ( Exception $e ) {
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$code = 500;
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$message = $e->getMessage();
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}
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throw new HttpError( $code, $message );
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}
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/**
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* Parse the key passed to the SpecialPage. Returns an array containing
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* the associated file object, the type ('file' or 'thumb') and if
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* application the transform parameters
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*
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* @param string $key
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* @throws UploadStashBadPathException
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* @return array
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*/
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private function parseKey( $key ) {
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$type = strtok( $key, '/' );
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if ( $type !== 'file' && $type !== 'thumb' ) {
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throw new UploadStashBadPathException( "Unknown type '$type'" );
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}
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$fileName = strtok( '/' );
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$thumbPart = strtok( '/' );
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$file = $this->stash->getFile( $fileName );
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if ( $type === 'thumb' ) {
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$srcNamePos = strrpos( $thumbPart, $fileName );
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if ( $srcNamePos === false || $srcNamePos < 1 ) {
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throw new UploadStashBadPathException( 'Unrecognized thumb name' );
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}
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$paramString = substr( $thumbPart, 0, $srcNamePos - 1 );
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$handler = $file->getHandler();
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if ( $handler ) {
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$params = $handler->parseParamString( $paramString );
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return array( 'file' => $file, 'type' => $type, 'params' => $params );
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} else {
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throw new UploadStashBadPathException( 'No handler found for ' .
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"mime {$file->getMimeType()} of file {$file->getPath()}" );
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}
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}
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return array( 'file' => $file, 'type' => $type );
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}
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/**
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* Get a thumbnail for file, either generated locally or remotely, and stream it out
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*
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* @param $file
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* @param $params array
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*
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* @return boolean success
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*/
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private function outputThumbFromStash( $file, $params ) {
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// this global, if it exists, points to a "scaler", as you might find in the Wikimedia Foundation cluster. See outputRemoteScaledThumb()
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// this is part of our horrible NFS-based system, we create a file on a mount point here, but fetch the scaled file from somewhere else that
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// happens to share it over NFS
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global $wgUploadStashScalerBaseUrl;
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$flags = 0;
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if ( $wgUploadStashScalerBaseUrl ) {
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$this->outputRemoteScaledThumb( $file, $params, $flags );
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} else {
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$this->outputLocallyScaledThumb( $file, $params, $flags );
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}
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}
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/**
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* Scale a file (probably with a locally installed imagemagick, or similar) and output it to STDOUT.
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* @param $file File
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* @param array $params Scaling parameters ( e.g. array( width => '50' ) );
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* @param int $flags Scaling flags ( see File:: constants )
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* @throws MWException
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* @throws UploadStashFileNotFoundException
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* @return boolean success
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*/
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private function outputLocallyScaledThumb( $file, $params, $flags ) {
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// n.b. this is stupid, we insist on re-transforming the file every time we are invoked. We rely
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// on HTTP caching to ensure this doesn't happen.
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$flags |= File::RENDER_NOW;
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$thumbnailImage = $file->transform( $params, $flags );
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if ( !$thumbnailImage ) {
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throw new MWException( 'Could not obtain thumbnail' );
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}
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// we should have just generated it locally
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if ( !$thumbnailImage->getStoragePath() ) {
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throw new UploadStashFileNotFoundException( "no local path for scaled item" );
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}
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// now we should construct a File, so we can get mime and other such info in a standard way
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// n.b. mimetype may be different from original (ogx original -> jpeg thumb)
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$thumbFile = new UnregisteredLocalFile( false,
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$this->stash->repo, $thumbnailImage->getStoragePath(), false );
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if ( !$thumbFile ) {
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throw new UploadStashFileNotFoundException( "couldn't create local file object for thumbnail" );
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}
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return $this->outputLocalFile( $thumbFile );
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}
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/**
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* Scale a file with a remote "scaler", as exists on the Wikimedia Foundation cluster, and output it to STDOUT.
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* Note: unlike the usual thumbnail process, the web client never sees the cluster URL; we do the whole HTTP transaction to the scaler ourselves
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* and cat the results out.
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* Note: We rely on NFS to have propagated the file contents to the scaler. However, we do not rely on the thumbnail being created in NFS and then
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* propagated back to our filesystem. Instead we take the results of the HTTP request instead.
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* Note: no caching is being done here, although we are instructing the client to cache it forever.
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* @param $file: File object
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* @param $params: scaling parameters ( e.g. array( width => '50' ) );
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* @param $flags: scaling flags ( see File:: constants )
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* @throws MWException
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* @return boolean success
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*/
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private function outputRemoteScaledThumb( $file, $params, $flags ) {
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// this global probably looks something like 'http://upload.wikimedia.org/wikipedia/test/thumb/temp'
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// do not use trailing slash
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global $wgUploadStashScalerBaseUrl;
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$scalerBaseUrl = $wgUploadStashScalerBaseUrl;
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if ( preg_match( '/^\/\//', $scalerBaseUrl ) ) {
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// this is apparently a protocol-relative URL, which makes no sense in this context,
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// since this is used for communication that's internal to the application.
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// default to http.
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$scalerBaseUrl = wfExpandUrl( $scalerBaseUrl, PROTO_CANONICAL );
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}
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// We need to use generateThumbName() instead of thumbName(), because
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// the suffix needs to match the file name for the remote thumbnailer
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// to work
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$scalerThumbName = $file->generateThumbName( $file->getName(), $params );
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$scalerThumbUrl = $scalerBaseUrl . '/' . $file->getUrlRel() .
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'/' . rawurlencode( $scalerThumbName );
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// make a curl call to the scaler to create a thumbnail
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$httpOptions = array(
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'method' => 'GET',
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'timeout' => 'default'
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);
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$req = MWHttpRequest::factory( $scalerThumbUrl, $httpOptions );
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$status = $req->execute();
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if ( ! $status->isOK() ) {
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$errors = $status->getErrorsArray();
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$errorStr = "Fetching thumbnail failed: " . print_r( $errors, 1 );
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$errorStr .= "\nurl = $scalerThumbUrl\n";
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throw new MWException( $errorStr );
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}
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$contentType = $req->getResponseHeader( "content-type" );
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if ( ! $contentType ) {
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throw new MWException( "Missing content-type header" );
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}
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return $this->outputContents( $req->getContent(), $contentType );
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}
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/**
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* Output HTTP response for file
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* Side effect: writes HTTP response to STDOUT.
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*
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* @param $file File object with a local path (e.g. UnregisteredLocalFile, LocalFile. Oddly these don't share an ancestor!)
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* @throws SpecialUploadStashTooLargeException
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* @return bool
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*/
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private function outputLocalFile( File $file ) {
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if ( $file->getSize() > self::MAX_SERVE_BYTES ) {
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throw new SpecialUploadStashTooLargeException();
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}
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return $file->getRepo()->streamFile( $file->getPath(),
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array( 'Content-Transfer-Encoding: binary',
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'Expires: Sun, 17-Jan-2038 19:14:07 GMT' )
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);
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}
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/**
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* Output HTTP response of raw content
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* Side effect: writes HTTP response to STDOUT.
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* @param string $content content
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* @param string $contentType mime type
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* @throws SpecialUploadStashTooLargeException
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* @return bool
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*/
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private function outputContents( $content, $contentType ) {
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$size = strlen( $content );
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if ( $size > self::MAX_SERVE_BYTES ) {
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throw new SpecialUploadStashTooLargeException();
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}
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self::outputFileHeaders( $contentType, $size );
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print $content;
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return true;
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}
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/**
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* Output headers for streaming
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* XXX unsure about encoding as binary; if we received from HTTP perhaps we should use that encoding, concatted with semicolon to mimeType as it usually is.
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* Side effect: preps PHP to write headers to STDOUT.
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* @param string $contentType : string suitable for content-type header
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* @param string $size: length in bytes
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*/
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private static function outputFileHeaders( $contentType, $size ) {
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header( "Content-Type: $contentType", true );
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header( 'Content-Transfer-Encoding: binary', true );
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header( 'Expires: Sun, 17-Jan-2038 19:14:07 GMT', true );
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// Bug 53032 - It shouldn't be a problem here, but let's be safe and not cache
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header( 'Cache-Control: private' );
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header( "Content-Length: $size", true );
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}
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/**
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* Static callback for the HTMLForm in showUploads, to process
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* Note the stash has to be recreated since this is being called in a static context.
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* This works, because there really is only one stash per logged-in user, despite appearances.
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*
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* @param array $formData
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* @return Status
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*/
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public static function tryClearStashedUploads( $formData ) {
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if ( isset( $formData['Clear'] ) ) {
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$stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash();
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wfDebug( "stash has: " . print_r( $stash->listFiles(), true ) );
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if ( ! $stash->clear() ) {
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return Status::newFatal( 'uploadstash-errclear' );
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}
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}
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return Status::newGood();
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}
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/**
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* Default action when we don't have a subpage -- just show links to the uploads we have,
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* Also show a button to clear stashed files
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* @return bool
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*/
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private function showUploads() {
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// sets the title, etc.
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$this->setHeaders();
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$this->outputHeader();
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// create the form, which will also be used to execute a callback to process incoming form data
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// this design is extremely dubious, but supposedly HTMLForm is our standard now?
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$context = new DerivativeContext( $this->getContext() );
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$context->setTitle( $this->getTitle() ); // Remove subpage
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$form = new HTMLForm( array(
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'Clear' => array(
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'type' => 'hidden',
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'default' => true,
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'name' => 'clear',
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)
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), $context, 'clearStashedUploads' );
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$form->setSubmitCallback( array( __CLASS__, 'tryClearStashedUploads' ) );
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$form->setSubmitTextMsg( 'uploadstash-clear' );
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$form->prepareForm();
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$formResult = $form->tryAuthorizedSubmit();
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// show the files + form, if there are any, or just say there are none
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$refreshHtml = Html::element( 'a',
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array( 'href' => $this->getTitle()->getLocalURL() ),
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$this->msg( 'uploadstash-refresh' )->text() );
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$files = $this->stash->listFiles();
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if ( $files && count( $files ) ) {
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sort( $files );
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$fileListItemsHtml = '';
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foreach ( $files as $file ) {
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// TODO: Use Linker::link or even construct the list in plain wikitext
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$fileListItemsHtml .= Html::rawElement( 'li', array(),
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Html::element( 'a', array( 'href' =>
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$this->getTitle( "file/$file" )->getLocalURL() ), $file )
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);
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}
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$this->getOutput()->addHtml( Html::rawElement( 'ul', array(), $fileListItemsHtml ) );
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$form->displayForm( $formResult );
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$this->getOutput()->addHtml( Html::rawElement( 'p', array(), $refreshHtml ) );
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} else {
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$this->getOutput()->addHtml( Html::rawElement( 'p', array(),
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Html::element( 'span', array(), $this->msg( 'uploadstash-nofiles' )->text() )
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. ' '
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. $refreshHtml
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) );
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}
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return true;
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}
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}
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class SpecialUploadStashTooLargeException extends MWException {};
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