includes/upload/UploadStash.php

   1 <?php
   2 /**
   3  * UploadStash is intended to accomplish a few things:
   4  *   - enable applications to temporarily stash files without publishing them to the wiki.
   5  *      - Several parts of MediaWiki do this in similar ways: UploadBase, UploadWizard, and FirefoggChunkedExtension
   6  *        And there are several that reimplement stashing from scratch, in idiosyncratic ways. The idea is to unify them all here.
   7  *        Mostly all of them are the same except for storing some custom fields, which we subsume into the data array.
   8  *   - enable applications to find said files later, as long as the db table or temp files haven't been purged.
   9  *   - enable the uploading user (and *ONLY* the uploading user) to access said files, and thumbnails of said files, via a URL.
  10  *     We accomplish this using a database table, with ownership checking as you might expect. See SpecialUploadStash, which
  11  *     implements a web interface to some files stored this way.
  12  *
  13  * UploadStash right now is *mostly* intended to show you one user's slice of the entire stash. The user parameter is only optional
  14  * because there are few cases where we clean out the stash from an automated script. In the future we might refactor this.
  15  *
  16  * UploadStash represents the entire stash of temporary files.
  17  * UploadStashFile is a filestore for the actual physical disk files.
  18  * UploadFromStash extends UploadBase, and represents a single stashed file as it is moved from the stash to the regular file repository
  19  */
  20 class UploadStash {
  21
  22         // Format of the key for files -- has to be suitable as a filename itself (e.g. ab12cd34ef.jpg)
  23         const KEY_FORMAT_REGEX = '/^[\w-\.]+\.\w*$/';
  24
  25         /**
  26          * repository that this uses to store temp files
  27          * public because we sometimes need to get a LocalFile within the same repo.
  28          *
  29          * @var LocalRepo
  30          */
  31         public $repo;
  32
  33         // array of initialized repo objects
  34         protected $files = array();
  35
  36         // cache of the file metadata that's stored in the database
  37         protected $fileMetadata = array();
  38
  39         // fileprops cache
  40         protected $fileProps = array();
  41
  42         // current user
  43         protected $user, $userId, $isLoggedIn;
  44
  45         /**
  46          * Represents a temporary filestore, with metadata in the database.
  47          * Designed to be compatible with the session stashing code in UploadBase (should replace it eventually)
  48          *
  49          * @param $repo FileRepo
  50          */
  51         public function __construct( $repo, $user = null ) {
  52                 // this might change based on wiki's configuration.
  53                 $this->repo = $repo;
  54
  55                 // if a user was passed, use it. otherwise, attempt to use the global.
  56                 // this keeps FileRepo from breaking when it creates an UploadStash object
  57                 if ( $user ) {
  58                         $this->user = $user;
  59                 } else {
  60                         global $wgUser;
  61                         $this->user = $wgUser;
  62                 }
  63
  64                 if ( is_object( $this->user ) ) {
  65                         $this->userId = $this->user->getId();
  66                         $this->isLoggedIn = $this->user->isLoggedIn();
  67                 }
  68         }
  69
  70         /**
  71          * Get a file and its metadata from the stash.
  72          * The noAuth param is a bit janky but is required for automated scripts which clean out the stash.
  73          *
  74          * @param $key String: key under which file information is stored
  75          * @param $noAuth Boolean (optional) Don't check authentication. Used by maintenance scripts.
  76          * @throws UploadStashFileNotFoundException
  77          * @throws UploadStashNotLoggedInException
  78          * @throws UploadStashWrongOwnerException
  79          * @throws UploadStashBadPathException
  80          * @return UploadStashFile
  81          */
  82         public function getFile( $key, $noAuth = false ) {
  83
  84                 if ( ! preg_match( self::KEY_FORMAT_REGEX, $key ) ) {
  85                         throw new UploadStashBadPathException( "key '$key' is not in a proper format" );
  86                 }
  87
  88                 if ( !$noAuth ) {
  89                         if ( !$this->isLoggedIn ) {
  90                                 throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
  91                         }
  92                 }
  93
  94                 if ( !isset( $this->fileMetadata[$key] ) ) {
  95                         if ( !$this->fetchFileMetadata( $key ) ) {
  96                                 // If nothing was received, it's likely due to replication lag.  Check the master to see if the record is there.
  97                                 $this->fetchFileMetadata( $key, DB_MASTER );
  98                         }
  99
 100                         if ( !isset( $this->fileMetadata[$key] ) ) {
 101                                 throw new UploadStashFileNotFoundException( "key '$key' not found in stash" );
 102                         }
 103
 104                         // create $this->files[$key]
 105                         $this->initFile( $key );
 106
 107                         // fetch fileprops
 108                         $path = $this->fileMetadata[$key]['us_path'];
 109                         if ( $this->repo->isVirtualUrl( $path ) ) {
 110                                 $path = $this->repo->resolveVirtualUrl( $path );
 111                         }
 112                         $this->fileProps[$key] = File::getPropsFromPath( $path );
 113                 }
 114
 115                 if ( ! $this->files[$key]->exists() ) {
 116                         wfDebug( __METHOD__ . " tried to get file at $key, but it doesn't exist\n" );
 117                         throw new UploadStashBadPathException( "path doesn't exist" );
 118                 }
 119
 120                 if ( !$noAuth ) {
 121                         if ( $this->fileMetadata[$key]['us_user'] != $this->userId ) {
 122                                 throw new UploadStashWrongOwnerException( "This file ($key) doesn't belong to the current user." );
 123                         }
 124                 }
 125
 126                 return $this->files[$key];
 127         }
 128
 129         /**
 130          * Getter for file metadata.
 131          *
 132          * @param key String: key under which file information is stored
 133          * @return Array
 134          */
 135         public function getMetadata ( $key ) {
 136                 $this->getFile( $key );
 137                 return $this->fileMetadata[$key];
 138         }
 139
 140         /**
 141          * Getter for fileProps
 142          *
 143          * @param key String: key under which file information is stored
 144          * @return Array
 145          */
 146         public function getFileProps ( $key ) {
 147                 $this->getFile( $key );
 148                 return $this->fileProps[$key];
 149         }
 150
 151         /**
 152          * Stash a file in a temp directory and record that we did this in the database, along with other metadata.
 153          *
 154          * @param $path String: path to file you want stashed
 155          * @param $sourceType String: the type of upload that generated this file (currently, I believe, 'file' or null)
 156          * @throws UploadStashBadPathException
 157          * @throws UploadStashFileException
 158          * @throws UploadStashNotLoggedInException
 159          * @return UploadStashFile: file, or null on failure
 160          */
 161         public function stashFile( $path, $sourceType = null ) {
 162                 if ( ! file_exists( $path ) ) {
 163                         wfDebug( __METHOD__ . " tried to stash file at '$path', but it doesn't exist\n" );
 164                         throw new UploadStashBadPathException( "path doesn't exist" );
 165                 }
 166                 $fileProps = File::getPropsFromPath( $path );
 167                 wfDebug( __METHOD__ . " stashing file at '$path'\n" );
 168
 169                 // we will be initializing from some tmpnam files that don't have extensions.
 170                 // most of MediaWiki assumes all uploaded files have good extensions. So, we fix this.
 171                 $extension = self::getExtensionForPath( $path );
 172                 if ( ! preg_match( "/\\.\\Q$extension\\E$/", $path ) ) {
 173                         $pathWithGoodExtension = "$path.$extension";
 174                         if ( ! rename( $path, $pathWithGoodExtension ) ) {
 175                                 throw new UploadStashFileException( "couldn't rename $path to have a better extension at $pathWithGoodExtension" );
 176                         }
 177                         $path = $pathWithGoodExtension;
 178                 }
 179
 180                 // If no key was supplied, make one.  a mysql insertid would be totally reasonable here, except
 181                 // that for historical reasons, the key is this random thing instead.  At least it's not guessable.
 182                 //
 183                 // some things that when combined will make a suitably unique key.
 184                 // see: http://www.jwz.org/doc/mid.html
 185                 list ($usec, $sec) = explode( ' ', microtime() );
 186                 $usec = substr($usec, 2);
 187                 $key = wfBaseConvert( $sec . $usec, 10, 36 ) . '.' .
 188                         wfBaseConvert( mt_rand(), 10, 36 ) . '.'.
 189                         $this->userId . '.' .
 190                         $extension;
 191
 192                 $this->fileProps[$key] = $fileProps;
 193
 194                 if ( ! preg_match( self::KEY_FORMAT_REGEX, $key ) ) {
 195                         throw new UploadStashBadPathException( "key '$key' is not in a proper format" );
 196                 }
 197
 198                 wfDebug( __METHOD__ . " key for '$path': $key\n" );
 199
 200                 // if not already in a temporary area, put it there
 201                 $storeStatus = $this->repo->storeTemp( basename( $path ), $path );
 202
 203                 if ( ! $storeStatus->isOK() ) {
 204                         // It is a convention in MediaWiki to only return one error per API exception, even if multiple errors
 205                         // are available. We use reset() to pick the "first" thing that was wrong, preferring errors to warnings.
 206                         // This is a bit lame, as we may have more info in the $storeStatus and we're throwing it away, but to fix it means
 207                         // redesigning API errors significantly.
 208                         // $storeStatus->value just contains the virtual URL (if anything) which is probably useless to the caller
 209                         $error = $storeStatus->getErrorsArray();
 210                         $error = reset( $error );
 211                         if ( ! count( $error ) ) {
 212                                 $error = $storeStatus->getWarningsArray();
 213                                 $error = reset( $error );
 214                                 if ( ! count( $error ) ) {
 215                                         $error = array( 'unknown', 'no error recorded' );
 216                                 }
 217                         }
 218                         throw new UploadStashFileException( "error storing file in '$path': " . implode( '; ', $error ) );
 219                 }
 220                 $stashPath = $storeStatus->value;
 221
 222                 // fetch the current user ID
 223                 if ( !$this->isLoggedIn ) {
 224                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 225                 }
 226
 227                 // insert the file metadata into the db.
 228                 wfDebug( __METHOD__ . " inserting $stashPath under $key\n" );
 229                 $dbw = $this->repo->getMasterDb();
 230
 231                 $this->fileMetadata[$key] = array(
 232                         'us_user' => $this->userId,
 233                         'us_key' => $key,
 234                         'us_orig_path' => $path,
 235                         'us_path' => $stashPath,
 236                         'us_size' => $fileProps['size'],
 237                         'us_sha1' => $fileProps['sha1'],
 238                         'us_mime' => $fileProps['mime'],
 239                         'us_media_type' => $fileProps['media_type'],
 240                         'us_image_width' => $fileProps['width'],
 241                         'us_image_height' => $fileProps['height'],
 242                         'us_image_bits' => $fileProps['bits'],
 243                         'us_source_type' => $sourceType,
 244                         'us_timestamp' => $dbw->timestamp(),
 245                         'us_status' => 'finished'
 246                 );
 247
 248                 $dbw->insert(
 249                         'uploadstash',
 250                         $this->fileMetadata[$key],
 251                         __METHOD__
 252                 );
 253
 254                 // store the insertid in the class variable so immediate retrieval (possibly laggy) isn't necesary.
 255                 $this->fileMetadata[$key]['us_id'] = $dbw->insertId();
 256
 257                 # create the UploadStashFile object for this file.
 258                 $this->initFile( $key );
 259
 260                 return $this->getFile( $key );
 261         }
 262
 263         /**
 264          * Remove all files from the stash.
 265          * Does not clean up files in the repo, just the record of them.
 266          *
 267          * @throws UploadStashNotLoggedInException
 268          * @return boolean: success
 269          */
 270         public function clear() {
 271                 if ( !$this->isLoggedIn ) {
 272                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 273                 }
 274
 275                 wfDebug( __METHOD__ . ' clearing all rows for user ' . $this->userId . "\n" );
 276                 $dbw = $this->repo->getMasterDb();
 277                 $dbw->delete(
 278                         'uploadstash',
 279                         array( 'us_user' => $this->userId ),
 280                         __METHOD__
 281                 );
 282
 283                 # destroy objects.
 284                 $this->files = array();
 285                 $this->fileMetadata = array();
 286
 287                 return true;
 288         }
 289
 290         /**
 291          * Remove a particular file from the stash.  Also removes it from the repo.
 292          *
 293          * @throws UploadStashNotLoggedInException
 294          * @throws UploadStashWrongOwnerException
 295          * @return boolean: success
 296          */
 297         public function removeFile( $key ) {
 298                 if ( !$this->isLoggedIn ) {
 299                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 300                 }
 301
 302                 $dbw = $this->repo->getMasterDb();
 303
 304                 // this is a cheap query. it runs on the master so that this function still works when there's lag.
 305                 // it won't be called all that often.
 306                 $row = $dbw->selectRow(
 307                         'uploadstash',
 308                         'us_user',
 309                         array( 'us_key' => $key ),
 310                         __METHOD__
 311                 );
 312
 313                 if( !$row ) {
 314                         throw new UploadStashNoSuchKeyException( "No such key ($key), cannot remove" );
 315                 }
 316
 317                 if ( $row->us_user != $this->userId ) {
 318                         throw new UploadStashWrongOwnerException( "Can't delete: the file ($key) doesn't belong to this user." );
 319                 }
 320
 321                 return $this->removeFileNoAuth( $key );
 322         }
 323
 324
 325         /**
 326          * Remove a file (see removeFile), but doesn't check ownership first.
 327          *
 328          * @return boolean: success
 329          */
 330         public function removeFileNoAuth( $key ) {
 331                 wfDebug( __METHOD__ . " clearing row $key\n" );
 332
 333                 $dbw = $this->repo->getMasterDb();
 334
 335                 // this gets its own transaction since it's called serially by the cleanupUploadStash maintenance script
 336                 $dbw->begin();
 337                 $dbw->delete(
 338                         'uploadstash',
 339                         array( 'us_key' => $key ),
 340                         __METHOD__
 341                 );
 342                 $dbw->commit();
 343
 344                 // TODO: look into UnregisteredLocalFile and find out why the rv here is sometimes wrong (false when file was removed)
 345                 // for now, ignore.
 346                 $this->files[$key]->remove();
 347
 348                 unset( $this->files[$key] );
 349                 unset( $this->fileMetadata[$key] );
 350
 351                 return true;
 352         }
 353
 354         /**
 355          * List all files in the stash.
 356          *
 357          * @throws UploadStashNotLoggedInException
 358          * @return Array
 359          */
 360         public function listFiles() {
 361                 if ( !$this->isLoggedIn ) {
 362                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 363                 }
 364
 365                 $dbr = $this->repo->getSlaveDb();
 366                 $res = $dbr->select(
 367                         'uploadstash',
 368                         'us_key',
 369                         array( 'us_user' => $this->userId ),
 370                         __METHOD__
 371                 );
 372
 373                 if ( !is_object( $res ) || $res->numRows() == 0 ) {
 374                         // nothing to do.
 375                         return false;
 376                 }
 377
 378                 // finish the read before starting writes.
 379                 $keys = array();
 380                 foreach ( $res as $row ) {
 381                         array_push( $keys, $row->us_key );
 382                 }
 383
 384                 return $keys;
 385         }
 386
 387         /**
 388          * Find or guess extension -- ensuring that our extension matches our mime type.
 389          * Since these files are constructed from php tempnames they may not start off
 390          * with an extension.
 391          * XXX this is somewhat redundant with the checks that ApiUpload.php does with incoming
 392          * uploads versus the desired filename. Maybe we can get that passed to us...
 393          */
 394         public static function getExtensionForPath( $path ) {
 395                 // Does this have an extension?
 396                 $n = strrpos( $path, '.' );
 397                 $extension = null;
 398                 if ( $n !== false ) {
 399                         $extension = $n ? substr( $path, $n + 1 ) : '';
 400                 } else {
 401                         // If not, assume that it should be related to the mime type of the original file.
 402                         $magic = MimeMagic::singleton();
 403                         $mimeType = $magic->guessMimeType( $path );
 404                         $extensions = explode( ' ', MimeMagic::singleton()->getExtensionsForType( $mimeType ) );
 405                         if ( count( $extensions ) ) {
 406                                 $extension = $extensions[0];
 407                         }
 408                 }
 409
 410                 if ( is_null( $extension ) ) {
 411                         throw new UploadStashFileException( "extension is null" );
 412                 }
 413
 414                 return File::normalizeExtension( $extension );
 415         }
 416
 417         /**
 418          * Helper function: do the actual database query to fetch file metadata.
 419          *
 420          * @param $key String: key
 421          * @return boolean
 422          */
 423         protected function fetchFileMetadata( $key, $readFromDB = DB_SLAVE ) {
 424                 // populate $fileMetadata[$key]
 425                 $dbr = null;
 426                 if( $readFromDB === DB_MASTER ) {
 427                         // sometimes reading from the master is necessary, if there's replication lag.
 428                         $dbr = $this->repo->getMasterDb();
 429                 } else {
 430                         $dbr = $this->repo->getSlaveDb();
 431                 }
 432
 433                 $row = $dbr->selectRow(
 434                         'uploadstash',
 435                         '*',
 436                         array( 'us_key' => $key ),
 437                         __METHOD__
 438                 );
 439
 440                 if ( !is_object( $row ) ) {
 441                         // key wasn't present in the database. this will happen sometimes.
 442                         return false;
 443                 }
 444
 445                 $this->fileMetadata[$key] = (array)$row;
 446
 447                 return true;
 448         }
 449
 450         /**
 451          * Helper function: Initialize the UploadStashFile for a given file.
 452          *
 453          * @param $path String: path to file
 454          * @param $key String: key under which to store the object
 455          * @throws UploadStashZeroLengthFileException
 456          * @return bool
 457          */
 458         protected function initFile( $key ) {
 459                 $file = new UploadStashFile( $this->repo, $this->fileMetadata[$key]['us_path'], $key );
 460                 if ( $file->getSize() === 0 ) {
 461                         throw new UploadStashZeroLengthFileException( "File is zero length" );
 462                 }
 463                 $this->files[$key] = $file;
 464                 return true;
 465         }
 466 }
 467
 468 class UploadStashFile extends UnregisteredLocalFile {
 469         private $fileKey;
 470         private $urlName;
 471         protected $url;
 472
 473         /**
 474          * A LocalFile wrapper around a file that has been temporarily stashed, so we can do things like create thumbnails for it
 475          * Arguably UnregisteredLocalFile should be handling its own file repo but that class is a bit retarded currently
 476          *
 477          * @param $repo FSRepo: repository where we should find the path
 478          * @param $path String: path to file
 479          * @param $key String: key to store the path and any stashed data under
 480          * @throws UploadStashBadPathException
 481          * @throws UploadStashFileNotFoundException
 482          */
 483         public function __construct( $repo, $path, $key ) {
 484                 $this->fileKey = $key;
 485
 486                 // resolve mwrepo:// urls
 487                 if ( $repo->isVirtualUrl( $path ) ) {
 488                         $path = $repo->resolveVirtualUrl( $path );
 489                 } else {
 490
 491                         // check if path appears to be sane, no parent traversals, and is in this repo's temp zone.
 492                         $repoTempPath = $repo->getZonePath( 'temp' );
 493                         if ( ( ! $repo->validateFilename( $path ) ) ||
 494                                         ( strpos( $path, $repoTempPath ) !== 0 ) ) {
 495                                 wfDebug( "UploadStash: tried to construct an UploadStashFile from a file that should already exist at '$path', but path is not valid\n" );
 496                                 throw new UploadStashBadPathException( 'path is not valid' );
 497                         }
 498
 499                         // check if path exists! and is a plain file.
 500                         if ( ! $repo->fileExists( $path, FileRepo::FILES_ONLY ) ) {
 501                                 wfDebug( "UploadStash: tried to construct an UploadStashFile from a file that should already exist at '$path', but path is not found\n" );
 502                                 throw new UploadStashFileNotFoundException( 'cannot find path, or not a plain file' );
 503                         }
 504                 }
 505
 506                 parent::__construct( false, $repo, $path, false );
 507
 508                 $this->name = basename( $this->path );
 509         }
 510
 511         /**
 512          * A method needed by the file transforming and scaling routines in File.php
 513          * We do not necessarily care about doing the description at this point
 514          * However, we also can't return the empty string, as the rest of MediaWiki demands this (and calls to imagemagick
 515          * convert require it to be there)
 516          *
 517          * @return String: dummy value
 518          */
 519         public function getDescriptionUrl() {
 520                 return $this->getUrl();
 521         }
 522
 523         /**
 524          * Get the path for the thumbnail (actually any transformation of this file)
 525          * The actual argument is the result of thumbName although we seem to have
 526          * buggy code elsewhere that expects a boolean 'suffix'
 527          *
 528          * @param $thumbName String: name of thumbnail (e.g. "120px-123456.jpg" ), or false to just get the path
 529          * @return String: path thumbnail should take on filesystem, or containing directory if thumbname is false
 530          */
 531         public function getThumbPath( $thumbName = false ) {
 532                 $path = dirname( $this->path );
 533                 if ( $thumbName !== false ) {
 534                         $path .= "/$thumbName";
 535                 }
 536                 return $path;
 537         }
 538
 539         /**
 540          * Return the file/url base name of a thumbnail with the specified parameters.
 541          * We override this because we want to use the pretty url name instead of the
 542          * ugly file name.
 543          *
 544          * @param $params Array: handler-specific parameters
 545          * @return String: base name for URL, like '120px-12345.jpg', or null if there is no handler
 546          */
 547         function thumbName( $params ) {
 548                 return $this->generateThumbName( $this->getUrlName(), $params );
 549         }
 550
 551         /**
 552          * Helper function -- given a 'subpage', return the local URL e.g. /wiki/Special:UploadStash/subpage
 553          * @param {String} $subPage
 554          * @return {String} local URL for this subpage in the Special:UploadStash space.
 555          */
 556         private function getSpecialUrl( $subPage ) {
 557                 return SpecialPage::getTitleFor( 'UploadStash', $subPage )->getLocalURL();
 558         }
 559
 560         /**
 561          * Get a URL to access the thumbnail
 562          * This is required because the model of how files work requires that
 563          * the thumbnail urls be predictable. However, in our model the URL is not based on the filename
 564          * (that's hidden in the db)
 565          *
 566          * @param $thumbName String: basename of thumbnail file -- however, we don't want to use the file exactly
 567          * @return String: URL to access thumbnail, or URL with partial path
 568          */
 569         public function getThumbUrl( $thumbName = false ) {
 570                 wfDebug( __METHOD__ . " getting for $thumbName \n" );
 571                 return $this->getSpecialUrl( 'thumb/' . $this->getUrlName() . '/' . $thumbName );
 572         }
 573
 574         /**
 575          * The basename for the URL, which we want to not be related to the filename.
 576          * Will also be used as the lookup key for a thumbnail file.
 577          *
 578          * @return String: base url name, like '120px-123456.jpg'
 579          */
 580         public function getUrlName() {
 581                 if ( ! $this->urlName ) {
 582                         $this->urlName = $this->fileKey;
 583                 }
 584                 return $this->urlName;
 585         }
 586
 587         /**
 588          * Return the URL of the file, if for some reason we wanted to download it
 589          * We tend not to do this for the original file, but we do want thumb icons
 590          *
 591          * @return String: url
 592          */
 593         public function getUrl() {
 594                 if ( !isset( $this->url ) ) {
 595                         $this->url = $this->getSpecialUrl( 'file/' . $this->getUrlName() );
 596                 }
 597                 return $this->url;
 598         }
 599
 600         /**
 601          * Parent classes use this method, for no obvious reason, to return the path (relative to wiki root, I assume).
 602          * But with this class, the URL is unrelated to the path.
 603          *
 604          * @return String: url
 605          */
 606         public function getFullUrl() {
 607                 return $this->getUrl();
 608         }
 609
 610         /**
 611          * Getter for file key (the unique id by which this file's location & metadata is stored in the db)
 612          *
 613          * @return String: file key
 614          */
 615         public function getFileKey() {
 616                 return $this->fileKey;
 617         }
 618
 619         /**
 620          * Remove the associated temporary file
 621          * @return Status: success
 622          */
 623         public function remove() {
 624                 if ( !$this->repo->fileExists( $this->path, FileRepo::FILES_ONLY ) ) {
 625                         // Maybe the file's already been removed? This could totally happen in UploadBase.
 626                         return true;
 627                 }
 628
 629                 return $this->repo->freeTemp( $this->path );
 630         }
 631
 632         public function exists() {
 633                 return $this->repo->fileExists( $this->path, FileRepo::FILES_ONLY );
 634         }
 635
 636 }
 637
 638 class UploadStashNotAvailableException extends MWException {};
 639 class UploadStashFileNotFoundException extends MWException {};
 640 class UploadStashBadPathException extends MWException {};
 641 class UploadStashFileException extends MWException {};
 642 class UploadStashZeroLengthFileException extends MWException {};
 643 class UploadStashNotLoggedInException extends MWException {};
 644 class UploadStashWrongOwnerException extends MWException {};
 645 class UploadStashNoSuchKeyException extends MWException {};