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