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  * @ingroup Upload
  21  */
  22 class UploadStash {
  23
  24         // Format of the key for files -- has to be suitable as a filename itself (e.g. ab12cd34ef.jpg)
  25         const KEY_FORMAT_REGEX = '/^[\w-\.]+\.\w*$/';
  26
  27         /**
  28          * repository that this uses to store temp files
  29          * public because we sometimes need to get a LocalFile within the same repo.
  30          *
  31          * @var LocalRepo
  32          */
  33         public $repo;
  34
  35         // array of initialized repo objects
  36         protected $files = array();
  37
  38         // cache of the file metadata that's stored in the database
  39         protected $fileMetadata = array();
  40
  41         // fileprops cache
  42         protected $fileProps = array();
  43
  44         // current user
  45         protected $user, $userId, $isLoggedIn;
  46
  47         /**
  48          * Represents a temporary filestore, with metadata in the database.
  49          * Designed to be compatible with the session stashing code in UploadBase (should replace it eventually)
  50          *
  51          * @param $repo FileRepo
  52          */
  53         public function __construct( FileRepo $repo, $user = null ) {
  54                 // this might change based on wiki's configuration.
  55                 $this->repo = $repo;
  56
  57                 // if a user was passed, use it. otherwise, attempt to use the global.
  58                 // this keeps FileRepo from breaking when it creates an UploadStash object
  59                 if ( $user ) {
  60                         $this->user = $user;
  61                 } else {
  62                         global $wgUser;
  63                         $this->user = $wgUser;
  64                 }
  65
  66                 if ( is_object( $this->user ) ) {
  67                         $this->userId = $this->user->getId();
  68                         $this->isLoggedIn = $this->user->isLoggedIn();
  69                 }
  70         }
  71
  72         /**
  73          * Get a file and its metadata from the stash.
  74          * The noAuth param is a bit janky but is required for automated scripts which clean out the stash.
  75          *
  76          * @param $key String: key under which file information is stored
  77          * @param $noAuth Boolean (optional) Don't check authentication. Used by maintenance scripts.
  78          * @throws UploadStashFileNotFoundException
  79          * @throws UploadStashNotLoggedInException
  80          * @throws UploadStashWrongOwnerException
  81          * @throws UploadStashBadPathException
  82          * @return UploadStashFile
  83          */
  84         public function getFile( $key, $noAuth = false ) {
  85
  86                 if ( ! preg_match( self::KEY_FORMAT_REGEX, $key ) ) {
  87                         throw new UploadStashBadPathException( "key '$key' is not in a proper format" );
  88                 }
  89
  90                 if ( !$noAuth ) {
  91                         if ( !$this->isLoggedIn ) {
  92                                 throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
  93                         }
  94                 }
  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                         $this->fileProps[$key] = $this->repo->getFileProps( $path );
 112                 }
 113
 114                 if ( ! $this->files[$key]->exists() ) {
 115                         wfDebug( __METHOD__ . " tried to get file at $key, but it doesn't exist\n" );
 116                         throw new UploadStashBadPathException( "path doesn't exist" );
 117                 }
 118
 119                 if ( !$noAuth ) {
 120                         if ( $this->fileMetadata[$key]['us_user'] != $this->userId ) {
 121                                 throw new UploadStashWrongOwnerException( "This file ($key) doesn't belong to the current user." );
 122                         }
 123                 }
 124
 125                 return $this->files[$key];
 126         }
 127
 128         /**
 129          * Getter for file metadata.
 130          *
 131          * @param key String: key under which file information is stored
 132          * @return Array
 133          */
 134         public function getMetadata ( $key ) {
 135                 $this->getFile( $key );
 136                 return $this->fileMetadata[$key];
 137         }
 138
 139         /**
 140          * Getter for fileProps
 141          *
 142          * @param key String: key under which file information is stored
 143          * @return Array
 144          */
 145         public function getFileProps ( $key ) {
 146                 $this->getFile( $key );
 147                 return $this->fileProps[$key];
 148         }
 149
 150         /**
 151          * Stash a file in a temp directory and record that we did this in the database, along with other metadata.
 152          *
 153          * @param $path String: path to file you want stashed
 154          * @param $sourceType String: the type of upload that generated this file (currently, I believe, 'file' or null)
 155          * @throws UploadStashBadPathException
 156          * @throws UploadStashFileException
 157          * @throws UploadStashNotLoggedInException
 158          * @return UploadStashFile: file, or null on failure
 159          */
 160         public function stashFile( $path, $sourceType = null ) {
 161                 if ( ! file_exists( $path ) ) {
 162                         wfDebug( __METHOD__ . " tried to stash file at '$path', but it doesn't exist\n" );
 163                         throw new UploadStashBadPathException( "path doesn't exist" );
 164                 }
 165                 $fileProps = FSFile::getPropsFromPath( $path );
 166                 wfDebug( __METHOD__ . " stashing file at '$path'\n" );
 167
 168                 // we will be initializing from some tmpnam files that don't have extensions.
 169                 // most of MediaWiki assumes all uploaded files have good extensions. So, we fix this.
 170                 $extension = self::getExtensionForPath( $path );
 171                 if ( ! preg_match( "/\\.\\Q$extension\\E$/", $path ) ) {
 172                         $pathWithGoodExtension = "$path.$extension";
 173                         if ( ! rename( $path, $pathWithGoodExtension ) ) {
 174                                 throw new UploadStashFileException( "couldn't rename $path to have a better extension at $pathWithGoodExtension" );
 175                         }
 176                         $path = $pathWithGoodExtension;
 177                 }
 178
 179                 // If no key was supplied, make one.  a mysql insertid would be totally reasonable here, except
 180                 // that for historical reasons, the key is this random thing instead.  At least it's not guessable.
 181                 //
 182                 // some things that when combined will make a suitably unique key.
 183                 // see: http://www.jwz.org/doc/mid.html
 184                 list ($usec, $sec) = explode( ' ', microtime() );
 185                 $usec = substr($usec, 2);
 186                 $key = wfBaseConvert( $sec . $usec, 10, 36 ) . '.' .
 187                         wfBaseConvert( mt_rand(), 10, 36 ) . '.'.
 188                         $this->userId . '.' .
 189                         $extension;
 190
 191                 $this->fileProps[$key] = $fileProps;
 192
 193                 if ( ! preg_match( self::KEY_FORMAT_REGEX, $key ) ) {
 194                         throw new UploadStashBadPathException( "key '$key' is not in a proper format" );
 195                 }
 196
 197                 wfDebug( __METHOD__ . " key for '$path': $key\n" );
 198
 199                 // if not already in a temporary area, put it there
 200                 $storeStatus = $this->repo->storeTemp( basename( $path ), $path );
 201
 202                 if ( ! $storeStatus->isOK() ) {
 203                         // It is a convention in MediaWiki to only return one error per API exception, even if multiple errors
 204                         // are available. We use reset() to pick the "first" thing that was wrong, preferring errors to warnings.
 205                         // 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
 206                         // redesigning API errors significantly.
 207                         // $storeStatus->value just contains the virtual URL (if anything) which is probably useless to the caller
 208                         $error = $storeStatus->getErrorsArray();
 209                         $error = reset( $error );
 210                         if ( ! count( $error ) ) {
 211                                 $error = $storeStatus->getWarningsArray();
 212                                 $error = reset( $error );
 213                                 if ( ! count( $error ) ) {
 214                                         $error = array( 'unknown', 'no error recorded' );
 215                                 }
 216                         }
 217                         // at this point, $error should contain the single "most important" error, plus any parameters.
 218                         throw new UploadStashFileException( "Error storing file in '$path': " . wfMessage( $error )->text() );
 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_id' => $dbw->nextSequenceValue( 'uploadstash_us_id_seq' ),
 233                         'us_user' => $this->userId,
 234                         'us_key' => $key,
 235                         'us_orig_path' => $path,
 236                         'us_path' => $stashPath, // virtual URL
 237                         'us_size' => $fileProps['size'],
 238                         'us_sha1' => $fileProps['sha1'],
 239                         'us_mime' => $fileProps['mime'],
 240                         'us_media_type' => $fileProps['media_type'],
 241                         'us_image_width' => $fileProps['width'],
 242                         'us_image_height' => $fileProps['height'],
 243                         'us_image_bits' => $fileProps['bits'],
 244                         'us_source_type' => $sourceType,
 245                         'us_timestamp' => $dbw->timestamp(),
 246                         'us_status' => 'finished'
 247                 );
 248
 249                 $dbw->insert(
 250                         'uploadstash',
 251                         $this->fileMetadata[$key],
 252                         __METHOD__
 253                 );
 254
 255                 // store the insertid in the class variable so immediate retrieval (possibly laggy) isn't necesary.
 256                 $this->fileMetadata[$key]['us_id'] = $dbw->insertId();
 257
 258                 # create the UploadStashFile object for this file.
 259                 $this->initFile( $key );
 260
 261                 return $this->getFile( $key );
 262         }
 263
 264         /**
 265          * Remove all files from the stash.
 266          * Does not clean up files in the repo, just the record of them.
 267          *
 268          * @throws UploadStashNotLoggedInException
 269          * @return boolean: success
 270          */
 271         public function clear() {
 272                 if ( !$this->isLoggedIn ) {
 273                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 274                 }
 275
 276                 wfDebug( __METHOD__ . ' clearing all rows for user ' . $this->userId . "\n" );
 277                 $dbw = $this->repo->getMasterDb();
 278                 $dbw->delete(
 279                         'uploadstash',
 280                         array( 'us_user' => $this->userId ),
 281                         __METHOD__
 282                 );
 283
 284                 # destroy objects.
 285                 $this->files = array();
 286                 $this->fileMetadata = array();
 287
 288                 return true;
 289         }
 290
 291         /**
 292          * Remove a particular file from the stash.  Also removes it from the repo.
 293          *
 294          * @throws UploadStashNotLoggedInException
 295          * @throws UploadStashWrongOwnerException
 296          * @return boolean: success
 297          */
 298         public function removeFile( $key ) {
 299                 if ( !$this->isLoggedIn ) {
 300                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 301                 }
 302
 303                 $dbw = $this->repo->getMasterDb();
 304
 305                 // this is a cheap query. it runs on the master so that this function still works when there's lag.
 306                 // it won't be called all that often.
 307                 $row = $dbw->selectRow(
 308                         'uploadstash',
 309                         'us_user',
 310                         array( 'us_key' => $key ),
 311                         __METHOD__
 312                 );
 313
 314                 if( !$row ) {
 315                         throw new UploadStashNoSuchKeyException( "No such key ($key), cannot remove" );
 316                 }
 317
 318                 if ( $row->us_user != $this->userId ) {
 319                         throw new UploadStashWrongOwnerException( "Can't delete: the file ($key) doesn't belong to this user." );
 320                 }
 321
 322                 return $this->removeFileNoAuth( $key );
 323         }
 324
 325
 326         /**
 327          * Remove a file (see removeFile), but doesn't check ownership first.
 328          *
 329          * @return boolean: success
 330          */
 331         public function removeFileNoAuth( $key ) {
 332                 wfDebug( __METHOD__ . " clearing row $key\n" );
 333
 334                 $dbw = $this->repo->getMasterDb();
 335
 336                 // this gets its own transaction since it's called serially by the cleanupUploadStash maintenance script
 337                 $dbw->begin( __METHOD__ );
 338                 $dbw->delete(
 339                         'uploadstash',
 340                         array( 'us_key' => $key ),
 341                         __METHOD__
 342                 );
 343                 $dbw->commit( __METHOD__ );
 344
 345                 // TODO: look into UnregisteredLocalFile and find out why the rv here is sometimes wrong (false when file was removed)
 346                 // for now, ignore.
 347                 $this->files[$key]->remove();
 348
 349                 unset( $this->files[$key] );
 350                 unset( $this->fileMetadata[$key] );
 351
 352                 return true;
 353         }
 354
 355         /**
 356          * List all files in the stash.
 357          *
 358          * @throws UploadStashNotLoggedInException
 359          * @return Array
 360          */
 361         public function listFiles() {
 362                 if ( !$this->isLoggedIn ) {
 363                         throw new UploadStashNotLoggedInException( __METHOD__ . ' No user is logged in, files must belong to users' );
 364                 }
 365
 366                 $dbr = $this->repo->getSlaveDb();
 367                 $res = $dbr->select(
 368                         'uploadstash',
 369                         'us_key',
 370                         array( 'us_user' => $this->userId ),
 371                         __METHOD__
 372                 );
 373
 374                 if ( !is_object( $res ) || $res->numRows() == 0 ) {
 375                         // nothing to do.
 376                         return false;
 377                 }
 378
 379                 // finish the read before starting writes.
 380                 $keys = array();
 381                 foreach ( $res as $row ) {
 382                         array_push( $keys, $row->us_key );
 383                 }
 384
 385                 return $keys;
 386         }
 387
 388         /**
 389          * Find or guess extension -- ensuring that our extension matches our mime type.
 390          * Since these files are constructed from php tempnames they may not start off
 391          * with an extension.
 392          * XXX this is somewhat redundant with the checks that ApiUpload.php does with incoming
 393          * uploads versus the desired filename. Maybe we can get that passed to us...
 394          * @return string
 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 FileRepo: 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( $path ) ) {
 503                                 wfDebug( "UploadStash: tried to construct an UploadStashFile from a file that should already exist at '$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 ) ) {
 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 );
 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 {};