includes/filebackend/SwiftFileBackend.php

   1 <?php
   2 /**
   3  * OpenStack Swift based file backend.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileBackend
  22  * @author Russ Nelson
  23  * @author Aaron Schulz
  24  */
  25
  26 /**
  27  * @brief Class for an OpenStack Swift (or Ceph RGW) based file backend.
  28  *
  29  * Status messages should avoid mentioning the Swift account name.
  30  * Likewise, error suppression should be used to avoid path disclosure.
  31  *
  32  * @ingroup FileBackend
  33  * @since 1.19
  34  */
  35 class SwiftFileBackend extends FileBackendStore {
  36         /** @var MultiHttpClient */
  37         protected $http;
  38
  39         /** @var int TTL in seconds */
  40         protected $authTTL;
  41
  42         /** @var string Authentication base URL (without version) */
  43         protected $swiftAuthUrl;
  44
  45         /** @var string Swift user (account:user) to authenticate as */
  46         protected $swiftUser;
  47
  48         /** @var string Secret key for user */
  49         protected $swiftKey;
  50
  51         /** @var string Shared secret value for making temp URLs */
  52         protected $swiftTempUrlKey;
  53
  54         /** @var string S3 access key (RADOS Gateway) */
  55         protected $rgwS3AccessKey;
  56
  57         /** @var string S3 authentication key (RADOS Gateway) */
  58         protected $rgwS3SecretKey;
  59
  60         /** @var BagOStuff */
  61         protected $srvCache;
  62
  63         /** @var ProcessCacheLRU Container stat cache */
  64         protected $containerStatCache;
  65
  66         /** @var array */
  67         protected $authCreds;
  68
  69         /** @var int UNIX timestamp */
  70         protected $authSessionTimestamp = 0;
  71
  72         /** @var int UNIX timestamp */
  73         protected $authErrorTimestamp = null;
  74
  75         /**
  76          * @see FileBackendStore::__construct()
  77          * Additional $config params include:
  78          *   - swiftAuthUrl       : Swift authentication server URL
  79          *   - swiftUser          : Swift user used by MediaWiki (account:username)
  80          *   - swiftKey           : Swift authentication key for the above user
  81          *   - swiftAuthTTL       : Swift authentication TTL (seconds)
  82          *   - swiftTempUrlKey    : Swift "X-Account-Meta-Temp-URL-Key" value on the account.
  83          *                          Do not set this until it has been set in the backend.
  84          *   - shardViaHashLevels : Map of container names to sharding config with:
  85          *                             - base   : base of hash characters, 16 or 36
  86          *                             - levels : the number of hash levels (and digits)
  87          *                             - repeat : hash subdirectories are prefixed with all the
  88          *                                        parent hash directory names (e.g. "a/ab/abc")
  89          *   - cacheAuthInfo      : Whether to cache authentication tokens in APC, XCache, ect.
  90          *                          If those are not available, then the main cache will be used.
  91          *                          This is probably insecure in shared hosting environments.
  92          *   - rgwS3AccessKey     : Rados Gateway S3 "access key" value on the account.
  93          *                          Do not set this until it has been set in the backend.
  94          *                          This is used for generating expiring pre-authenticated URLs.
  95          *                          Only use this when using rgw and to work around
  96          *                          http://tracker.newdream.net/issues/3454.
  97          *   - rgwS3SecretKey     : Rados Gateway S3 "secret key" value on the account.
  98          *                          Do not set this until it has been set in the backend.
  99          *                          This is used for generating expiring pre-authenticated URLs.
 100          *                          Only use this when using rgw and to work around
 101          *                          http://tracker.newdream.net/issues/3454.
 102          */
 103         public function __construct( array $config ) {
 104                 parent::__construct( $config );
 105                 // Required settings
 106                 $this->swiftAuthUrl = $config['swiftAuthUrl'];
 107                 $this->swiftUser = $config['swiftUser'];
 108                 $this->swiftKey = $config['swiftKey'];
 109                 // Optional settings
 110                 $this->authTTL = isset( $config['swiftAuthTTL'] )
 111                         ? $config['swiftAuthTTL']
 112                         : 5 * 60; // some sane number
 113                 $this->swiftTempUrlKey = isset( $config['swiftTempUrlKey'] )
 114                         ? $config['swiftTempUrlKey']
 115                         : '';
 116                 $this->shardViaHashLevels = isset( $config['shardViaHashLevels'] )
 117                         ? $config['shardViaHashLevels']
 118                         : '';
 119                 $this->rgwS3AccessKey = isset( $config['rgwS3AccessKey'] )
 120                         ? $config['rgwS3AccessKey']
 121                         : '';
 122                 $this->rgwS3SecretKey = isset( $config['rgwS3SecretKey'] )
 123                         ? $config['rgwS3SecretKey']
 124                         : '';
 125                 // HTTP helper client
 126                 $this->http = new MultiHttpClient( array() );
 127                 // Cache container information to mask latency
 128                 $this->memCache = wfGetMainCache();
 129                 // Process cache for container info
 130                 $this->containerStatCache = new ProcessCacheLRU( 300 );
 131                 // Cache auth token information to avoid RTTs
 132                 if ( !empty( $config['cacheAuthInfo'] ) ) {
 133                         if ( PHP_SAPI === 'cli' ) {
 134                                 $this->srvCache = wfGetMainCache(); // preferrably memcached
 135                         } else {
 136                                 try { // look for APC, XCache, WinCache, ect...
 137                                         $this->srvCache = ObjectCache::newAccelerator( array() );
 138                                 } catch ( Exception $e ) {
 139                                 }
 140                         }
 141                 }
 142                 $this->srvCache = $this->srvCache ?: new EmptyBagOStuff();
 143         }
 144
 145         public function getFeatures() {
 146                 return ( FileBackend::ATTR_HEADERS | FileBackend::ATTR_METADATA );
 147         }
 148
 149         protected function resolveContainerPath( $container, $relStoragePath ) {
 150                 if ( !mb_check_encoding( $relStoragePath, 'UTF-8' ) ) { // mb_string required by CF
 151                         return null; // not UTF-8, makes it hard to use CF and the swift HTTP API
 152                 } elseif ( strlen( urlencode( $relStoragePath ) ) > 1024 ) {
 153                         return null; // too long for Swift
 154                 }
 155
 156                 return $relStoragePath;
 157         }
 158
 159         public function isPathUsableInternal( $storagePath ) {
 160                 list( $container, $rel ) = $this->resolveStoragePathReal( $storagePath );
 161                 if ( $rel === null ) {
 162                         return false; // invalid
 163                 }
 164
 165                 return is_array( $this->getContainerStat( $container ) );
 166         }
 167
 168         /**
 169          * Sanitize and filter the custom headers from a $params array.
 170          * We only allow certain Content- and X-Content- headers.
 171          *
 172          * @param array $headers
 173          * @return array Sanitized value of 'headers' field in $params
 174          */
 175         protected function sanitizeHdrs( array $params ) {
 176                 $headers = array();
 177
 178                 // Normalize casing, and strip out illegal headers
 179                 if ( isset( $params['headers'] ) ) {
 180                         foreach ( $params['headers'] as $name => $value ) {
 181                                 $name = strtolower( $name );
 182                                 if ( preg_match( '/^content-(type|length)$/', $name ) ) {
 183                                         continue; // blacklisted
 184                                 } elseif ( preg_match( '/^(x-)?content-/', $name ) ) {
 185                                         $headers[$name] = $value; // allowed
 186                                 } elseif ( preg_match( '/^content-(disposition)/', $name ) ) {
 187                                         $headers[$name] = $value; // allowed
 188                                 }
 189                         }
 190                 }
 191                 // By default, Swift has annoyingly low maximum header value limits
 192                 if ( isset( $headers['content-disposition'] ) ) {
 193                         $disposition = '';
 194                         foreach ( explode( ';', $headers['content-disposition'] ) as $part ) {
 195                                 $part = trim( $part );
 196                                 $new = ( $disposition === '' ) ? $part : "{$disposition};{$part}";
 197                                 if ( strlen( $new ) <= 255 ) {
 198                                         $disposition = $new;
 199                                 } else {
 200                                         break; // too long; sigh
 201                                 }
 202                         }
 203                         $headers['content-disposition'] = $disposition;
 204                 }
 205
 206                 return $headers;
 207         }
 208
 209         protected function doCreateInternal( array $params ) {
 210                 $status = Status::newGood();
 211
 212                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 213                 if ( $dstRel === null ) {
 214                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 215
 216                         return $status;
 217                 }
 218
 219                 $sha1Hash = wfBaseConvert( sha1( $params['content'] ), 16, 36, 31 );
 220                 $contentType = $this->getContentType( $params['dst'], $params['content'], null );
 221
 222                 $reqs = array( array(
 223                         'method' => 'PUT',
 224                         'url' => array( $dstCont, $dstRel ),
 225                         'headers' => array(
 226                                 'content-length' => strlen( $params['content'] ),
 227                                 'etag' => md5( $params['content'] ),
 228                                 'content-type' => $contentType,
 229                                 'x-object-meta-sha1base36' => $sha1Hash
 230                         ) + $this->sanitizeHdrs( $params ),
 231                         'body' => $params['content']
 232                 ) );
 233
 234                 $be = $this;
 235                 $method = __METHOD__;
 236                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 237                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 238                         if ( $rcode === 201 ) {
 239                                 // good
 240                         } elseif ( $rcode === 412 ) {
 241                                 $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 242                         } else {
 243                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 244                         }
 245                 };
 246
 247                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 248                 if ( !empty( $params['async'] ) ) { // deferred
 249                         $status->value = $opHandle;
 250                 } else { // actually write the object in Swift
 251                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 252                 }
 253
 254                 return $status;
 255         }
 256
 257         protected function doStoreInternal( array $params ) {
 258                 $status = Status::newGood();
 259
 260                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 261                 if ( $dstRel === null ) {
 262                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 263
 264                         return $status;
 265                 }
 266
 267                 wfSuppressWarnings();
 268                 $sha1Hash = sha1_file( $params['src'] );
 269                 wfRestoreWarnings();
 270                 if ( $sha1Hash === false ) { // source doesn't exist?
 271                         $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 272
 273                         return $status;
 274                 }
 275                 $sha1Hash = wfBaseConvert( $sha1Hash, 16, 36, 31 );
 276                 $contentType = $this->getContentType( $params['dst'], null, $params['src'] );
 277
 278                 $handle = fopen( $params['src'], 'rb' );
 279                 if ( $handle === false ) { // source doesn't exist?
 280                         $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 281
 282                         return $status;
 283                 }
 284
 285                 $reqs = array( array(
 286                         'method' => 'PUT',
 287                         'url' => array( $dstCont, $dstRel ),
 288                         'headers' => array(
 289                                 'content-length' => filesize( $params['src'] ),
 290                                 'etag' => md5_file( $params['src'] ),
 291                                 'content-type' => $contentType,
 292                                 'x-object-meta-sha1base36' => $sha1Hash
 293                         ) + $this->sanitizeHdrs( $params ),
 294                         'body' => $handle // resource
 295                 ) );
 296
 297                 $be = $this;
 298                 $method = __METHOD__;
 299                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 300                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 301                         if ( $rcode === 201 ) {
 302                                 // good
 303                         } elseif ( $rcode === 412 ) {
 304                                 $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 305                         } else {
 306                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 307                         }
 308                 };
 309
 310                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 311                 if ( !empty( $params['async'] ) ) { // deferred
 312                         $status->value = $opHandle;
 313                 } else { // actually write the object in Swift
 314                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 315                 }
 316
 317                 return $status;
 318         }
 319
 320         protected function doCopyInternal( array $params ) {
 321                 $status = Status::newGood();
 322
 323                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 324                 if ( $srcRel === null ) {
 325                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 326
 327                         return $status;
 328                 }
 329
 330                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 331                 if ( $dstRel === null ) {
 332                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 333
 334                         return $status;
 335                 }
 336
 337                 $reqs = array( array(
 338                         'method' => 'PUT',
 339                         'url' => array( $dstCont, $dstRel ),
 340                         'headers' => array(
 341                                 'x-copy-from' => '/' . rawurlencode( $srcCont ) .
 342                                         '/' . str_replace( "%2F", "/", rawurlencode( $srcRel ) )
 343                         ) + $this->sanitizeHdrs( $params ), // extra headers merged into object
 344                 ) );
 345
 346                 $be = $this;
 347                 $method = __METHOD__;
 348                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 349                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 350                         if ( $rcode === 201 ) {
 351                                 // good
 352                         } elseif ( $rcode === 404 ) {
 353                                 $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 354                         } else {
 355                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 356                         }
 357                 };
 358
 359                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 360                 if ( !empty( $params['async'] ) ) { // deferred
 361                         $status->value = $opHandle;
 362                 } else { // actually write the object in Swift
 363                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 364                 }
 365
 366                 return $status;
 367         }
 368
 369         protected function doMoveInternal( array $params ) {
 370                 $status = Status::newGood();
 371
 372                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 373                 if ( $srcRel === null ) {
 374                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 375
 376                         return $status;
 377                 }
 378
 379                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 380                 if ( $dstRel === null ) {
 381                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 382
 383                         return $status;
 384                 }
 385
 386                 $reqs = array(
 387                         array(
 388                                 'method' => 'PUT',
 389                                 'url' => array( $dstCont, $dstRel ),
 390                                 'headers' => array(
 391                                         'x-copy-from' => '/' . rawurlencode( $srcCont ) .
 392                                                 '/' . str_replace( "%2F", "/", rawurlencode( $srcRel ) )
 393                                 ) + $this->sanitizeHdrs( $params ) // extra headers merged into object
 394                         )
 395                 );
 396                 if ( "{$srcCont}/{$srcRel}" !== "{$dstCont}/{$dstRel}" ) {
 397                         $reqs[] = array(
 398                                 'method' => 'DELETE',
 399                                 'url' => array( $srcCont, $srcRel ),
 400                                 'headers' => array()
 401                         );
 402                 }
 403
 404                 $be = $this;
 405                 $method = __METHOD__;
 406                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 407                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 408                         if ( $request['method'] === 'PUT' && $rcode === 201 ) {
 409                                 // good
 410                         } elseif ( $request['method'] === 'DELETE' && $rcode === 204 ) {
 411                                 // good
 412                         } elseif ( $rcode === 404 ) {
 413                                 $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 414                         } else {
 415                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 416                         }
 417                 };
 418
 419                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 420                 if ( !empty( $params['async'] ) ) { // deferred
 421                         $status->value = $opHandle;
 422                 } else { // actually move the object in Swift
 423                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 424                 }
 425
 426                 return $status;
 427         }
 428
 429         protected function doDeleteInternal( array $params ) {
 430                 $status = Status::newGood();
 431
 432                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 433                 if ( $srcRel === null ) {
 434                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 435
 436                         return $status;
 437                 }
 438
 439                 $reqs = array( array(
 440                         'method' => 'DELETE',
 441                         'url' => array( $srcCont, $srcRel ),
 442                         'headers' => array()
 443                 ) );
 444
 445                 $be = $this;
 446                 $method = __METHOD__;
 447                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 448                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 449                         if ( $rcode === 204 ) {
 450                                 // good
 451                         } elseif ( $rcode === 404 ) {
 452                                 if ( empty( $params['ignoreMissingSource'] ) ) {
 453                                         $status->fatal( 'backend-fail-delete', $params['src'] );
 454                                 }
 455                         } else {
 456                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 457                         }
 458                 };
 459
 460                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 461                 if ( !empty( $params['async'] ) ) { // deferred
 462                         $status->value = $opHandle;
 463                 } else { // actually delete the object in Swift
 464                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 465                 }
 466
 467                 return $status;
 468         }
 469
 470         protected function doDescribeInternal( array $params ) {
 471                 $status = Status::newGood();
 472
 473                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 474                 if ( $srcRel === null ) {
 475                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 476
 477                         return $status;
 478                 }
 479
 480                 // Fetch the old object headers/metadata...this should be in stat cache by now
 481                 $stat = $this->getFileStat( array( 'src' => $params['src'], 'latest' => 1 ) );
 482                 if ( $stat && !isset( $stat['xattr'] ) ) { // older cache entry
 483                         $stat = $this->doGetFileStat( array( 'src' => $params['src'], 'latest' => 1 ) );
 484                 }
 485                 if ( !$stat ) {
 486                         $status->fatal( 'backend-fail-describe', $params['src'] );
 487
 488                         return $status;
 489                 }
 490
 491                 // POST clears prior headers, so we need to merge the changes in to the old ones
 492                 $metaHdrs = array();
 493                 foreach ( $stat['xattr']['metadata'] as $name => $value ) {
 494                         $metaHdrs["x-object-meta-$name"] = $value;
 495                 }
 496                 $customHdrs = $this->sanitizeHdrs( $params ) + $stat['xattr']['headers'];
 497
 498                 $reqs = array( array(
 499                         'method' => 'POST',
 500                         'url' => array( $srcCont, $srcRel ),
 501                         'headers' => $metaHdrs + $customHdrs
 502                 ) );
 503
 504                 $be = $this;
 505                 $method = __METHOD__;
 506                 $handler = function ( array $request, Status $status ) use ( $be, $method, $params ) {
 507                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
 508                         if ( $rcode === 202 ) {
 509                                 // good
 510                         } elseif ( $rcode === 404 ) {
 511                                 $status->fatal( 'backend-fail-describe', $params['src'] );
 512                         } else {
 513                                 $be->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
 514                         }
 515                 };
 516
 517                 $opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
 518                 if ( !empty( $params['async'] ) ) { // deferred
 519                         $status->value = $opHandle;
 520                 } else { // actually change the object in Swift
 521                         $status->merge( current( $this->doExecuteOpHandlesInternal( array( $opHandle ) ) ) );
 522                 }
 523
 524                 return $status;
 525         }
 526
 527         protected function doPrepareInternal( $fullCont, $dir, array $params ) {
 528                 $status = Status::newGood();
 529
 530                 // (a) Check if container already exists
 531                 $stat = $this->getContainerStat( $fullCont );
 532                 if ( is_array( $stat ) ) {
 533                         return $status; // already there
 534                 } elseif ( $stat === null ) {
 535                         $status->fatal( 'backend-fail-internal', $this->name );
 536
 537                         return $status;
 538                 }
 539
 540                 // (b) Create container as needed with proper ACLs
 541                 if ( $stat === false ) {
 542                         $params['op'] = 'prepare';
 543                         $status->merge( $this->createContainer( $fullCont, $params ) );
 544                 }
 545
 546                 return $status;
 547         }
 548
 549         protected function doSecureInternal( $fullCont, $dir, array $params ) {
 550                 $status = Status::newGood();
 551                 if ( empty( $params['noAccess'] ) ) {
 552                         return $status; // nothing to do
 553                 }
 554
 555                 $stat = $this->getContainerStat( $fullCont );
 556                 if ( is_array( $stat ) ) {
 557                         // Make container private to end-users...
 558                         $status->merge( $this->setContainerAccess(
 559                                 $fullCont,
 560                                 array( $this->swiftUser ), // read
 561                                 array( $this->swiftUser ) // write
 562                         ) );
 563                 } elseif ( $stat === false ) {
 564                         $status->fatal( 'backend-fail-usable', $params['dir'] );
 565                 } else {
 566                         $status->fatal( 'backend-fail-internal', $this->name );
 567                 }
 568
 569                 return $status;
 570         }
 571
 572         protected function doPublishInternal( $fullCont, $dir, array $params ) {
 573                 $status = Status::newGood();
 574
 575                 $stat = $this->getContainerStat( $fullCont );
 576                 if ( is_array( $stat ) ) {
 577                         // Make container public to end-users...
 578                         $status->merge( $this->setContainerAccess(
 579                                 $fullCont,
 580                                 array( $this->swiftUser, '.r:*' ), // read
 581                                 array( $this->swiftUser ) // write
 582                         ) );
 583                 } elseif ( $stat === false ) {
 584                         $status->fatal( 'backend-fail-usable', $params['dir'] );
 585                 } else {
 586                         $status->fatal( 'backend-fail-internal', $this->name );
 587                 }
 588
 589                 return $status;
 590         }
 591
 592         protected function doCleanInternal( $fullCont, $dir, array $params ) {
 593                 $status = Status::newGood();
 594
 595                 // Only containers themselves can be removed, all else is virtual
 596                 if ( $dir != '' ) {
 597                         return $status; // nothing to do
 598                 }
 599
 600                 // (a) Check the container
 601                 $stat = $this->getContainerStat( $fullCont, true );
 602                 if ( $stat === false ) {
 603                         return $status; // ok, nothing to do
 604                 } elseif ( !is_array( $stat ) ) {
 605                         $status->fatal( 'backend-fail-internal', $this->name );
 606
 607                         return $status;
 608                 }
 609
 610                 // (b) Delete the container if empty
 611                 if ( $stat['count'] == 0 ) {
 612                         $params['op'] = 'clean';
 613                         $status->merge( $this->deleteContainer( $fullCont, $params ) );
 614                 }
 615
 616                 return $status;
 617         }
 618
 619         protected function doGetFileStat( array $params ) {
 620                 $params['concurrency'] = 1;
 621                 $stats = $this->doGetFileStatMulti( array( 'srcs' => array( $params['src'] ) ) + $params );
 622
 623                 return reset( $stats );
 624         }
 625
 626         /**
 627          * Convert dates like "Tue, 03 Jan 2012 22:01:04 GMT"/"2013-05-11T07:37:27.678360Z".
 628          * Dates might also come in like "2013-05-11T07:37:27.678360" from Swift listings,
 629          * missing the timezone suffix (though Ceph RGW does not appear to have this bug).
 630          *
 631          * @param string $ts
 632          * @param int $format Output format (TS_* constant)
 633          * @return string
 634          * @throws FileBackendError
 635          */
 636         protected function convertSwiftDate( $ts, $format = TS_MW ) {
 637                 try {
 638                         $timestamp = new MWTimestamp( $ts );
 639
 640                         return $timestamp->getTimestamp( $format );
 641                 } catch ( MWException $e ) {
 642                         throw new FileBackendError( $e->getMessage() );
 643                 }
 644         }
 645
 646         /**
 647          * Fill in any missing object metadata and save it to Swift
 648          *
 649          * @param array $objHdrs Object response headers
 650          * @param string $path Storage path to object
 651          * @return array New headers
 652          */
 653         protected function addMissingMetadata( array $objHdrs, $path ) {
 654                 if ( isset( $objHdrs['x-object-meta-sha1base36'] ) ) {
 655                         return $objHdrs; // nothing to do
 656                 }
 657
 658                 $section = new ProfileSection( __METHOD__ . '-' . $this->name );
 659                 trigger_error( "$path was not stored with SHA-1 metadata.", E_USER_WARNING );
 660
 661                 $auth = $this->getAuthentication();
 662                 if ( !$auth ) {
 663                         $objHdrs['x-object-meta-sha1base36'] = false;
 664
 665                         return $objHdrs; // failed
 666                 }
 667
 668                 $status = Status::newGood();
 669                 $scopeLockS = $this->getScopedFileLocks( array( $path ), LockManager::LOCK_UW, $status );
 670                 if ( $status->isOK() ) {
 671                         $tmpFile = $this->getLocalCopy( array( 'src' => $path, 'latest' => 1 ) );
 672                         if ( $tmpFile ) {
 673                                 $hash = $tmpFile->getSha1Base36();
 674                                 if ( $hash !== false ) {
 675                                         $objHdrs['x-object-meta-sha1base36'] = $hash;
 676                                         list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
 677                                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
 678                                                 'method' => 'POST',
 679                                                 'url' => $this->storageUrl( $auth, $srcCont, $srcRel ),
 680                                                 'headers' => $this->authTokenHeaders( $auth ) + $objHdrs
 681                                         ) );
 682                                         if ( $rcode >= 200 && $rcode <= 299 ) {
 683                                                 return $objHdrs; // success
 684                                         }
 685                                 }
 686                         }
 687                 }
 688                 trigger_error( "Unable to set SHA-1 metadata for $path", E_USER_WARNING );
 689                 $objHdrs['x-object-meta-sha1base36'] = false;
 690
 691                 return $objHdrs; // failed
 692         }
 693
 694         protected function doGetFileContentsMulti( array $params ) {
 695                 $contents = array();
 696
 697                 $auth = $this->getAuthentication();
 698
 699                 $ep = array_diff_key( $params, array( 'srcs' => 1 ) ); // for error logging
 700                 // Blindly create tmp files and stream to them, catching any exception if the file does
 701                 // not exist. Doing stats here is useless and will loop infinitely in addMissingMetadata().
 702                 $reqs = array(); // (path => op)
 703
 704                 foreach ( $params['srcs'] as $path ) { // each path in this concurrent batch
 705                         list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
 706                         if ( $srcRel === null || !$auth ) {
 707                                 $contents[$path] = false;
 708                                 continue;
 709                         }
 710                         // Create a new temporary memory file...
 711                         $handle = fopen( 'php://temp', 'wb' );
 712                         if ( $handle ) {
 713                                 $reqs[$path] = array(
 714                                         'method'  => 'GET',
 715                                         'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
 716                                         'headers' => $this->authTokenHeaders( $auth )
 717                                                 + $this->headersFromParams( $params ),
 718                                         'stream'  => $handle,
 719                                 );
 720                         }
 721                         $contents[$path] = false;
 722                 }
 723
 724                 $opts = array( 'maxConnsPerHost' => $params['concurrency'] );
 725                 $reqs = $this->http->runMulti( $reqs, $opts );
 726                 foreach ( $reqs as $path => $op ) {
 727                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $op['response'];
 728                         if ( $rcode >= 200 && $rcode <= 299 ) {
 729                                 rewind( $op['stream'] ); // start from the beginning
 730                                 $contents[$path] = stream_get_contents( $op['stream'] );
 731                         } elseif ( $rcode === 404 ) {
 732                                 $contents[$path] = false;
 733                         } else {
 734                                 $this->onError( null, __METHOD__,
 735                                         array( 'src' => $path ) + $ep, $rerr, $rcode, $rdesc );
 736                         }
 737                         fclose( $op['stream'] ); // close open handle
 738                 }
 739
 740                 return $contents;
 741         }
 742
 743         protected function doDirectoryExists( $fullCont, $dir, array $params ) {
 744                 $prefix = ( $dir == '' ) ? null : "{$dir}/";
 745                 $status = $this->objectListing( $fullCont, 'names', 1, null, $prefix );
 746                 if ( $status->isOk() ) {
 747                         return ( count( $status->value ) ) > 0;
 748                 }
 749
 750                 return null; // error
 751         }
 752
 753         /**
 754          * @see FileBackendStore::getDirectoryListInternal()
 755          * @param string $fullCont
 756          * @param string $dir
 757          * @param array $params
 758          * @return SwiftFileBackendDirList
 759          */
 760         public function getDirectoryListInternal( $fullCont, $dir, array $params ) {
 761                 return new SwiftFileBackendDirList( $this, $fullCont, $dir, $params );
 762         }
 763
 764         /**
 765          * @see FileBackendStore::getFileListInternal()
 766          * @param string $fullCont
 767          * @param string $dir
 768          * @param array $params
 769          * @return SwiftFileBackendFileList
 770          */
 771         public function getFileListInternal( $fullCont, $dir, array $params ) {
 772                 return new SwiftFileBackendFileList( $this, $fullCont, $dir, $params );
 773         }
 774
 775         /**
 776          * Do not call this function outside of SwiftFileBackendFileList
 777          *
 778          * @param string $fullCont Resolved container name
 779          * @param string $dir Resolved storage directory with no trailing slash
 780          * @param string|null $after Resolved container relative path to list items after
 781          * @param int $limit Max number of items to list
 782          * @param array $params Parameters for getDirectoryList()
 783          * @return array List of container relative resolved paths of directories directly under $dir
 784          * @throws FileBackendError
 785          */
 786         public function getDirListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
 787                 $dirs = array();
 788                 if ( $after === INF ) {
 789                         return $dirs; // nothing more
 790                 }
 791
 792                 $section = new ProfileSection( __METHOD__ . '-' . $this->name );
 793
 794                 $prefix = ( $dir == '' ) ? null : "{$dir}/";
 795                 // Non-recursive: only list dirs right under $dir
 796                 if ( !empty( $params['topOnly'] ) ) {
 797                         $status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix, '/' );
 798                         if ( !$status->isOk() ) {
 799                                 return $dirs; // error
 800                         }
 801                         $objects = $status->value;
 802                         foreach ( $objects as $object ) { // files and directories
 803                                 if ( substr( $object, -1 ) === '/' ) {
 804                                         $dirs[] = $object; // directories end in '/'
 805                                 }
 806                         }
 807                 } else {
 808                         // Recursive: list all dirs under $dir and its subdirs
 809                         $getParentDir = function ( $path ) {
 810                                 return ( strpos( $path, '/' ) !== false ) ? dirname( $path ) : false;
 811                         };
 812
 813                         // Get directory from last item of prior page
 814                         $lastDir = $getParentDir( $after ); // must be first page
 815                         $status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix );
 816
 817                         if ( !$status->isOk() ) {
 818                                 return $dirs; // error
 819                         }
 820
 821                         $objects = $status->value;
 822
 823                         foreach ( $objects as $object ) { // files
 824                                 $objectDir = $getParentDir( $object ); // directory of object
 825
 826                                 if ( $objectDir !== false && $objectDir !== $dir ) {
 827                                         // Swift stores paths in UTF-8, using binary sorting.
 828                                         // See function "create_container_table" in common/db.py.
 829                                         // If a directory is not "greater" than the last one,
 830                                         // then it was already listed by the calling iterator.
 831                                         if ( strcmp( $objectDir, $lastDir ) > 0 ) {
 832                                                 $pDir = $objectDir;
 833                                                 do { // add dir and all its parent dirs
 834                                                         $dirs[] = "{$pDir}/";
 835                                                         $pDir = $getParentDir( $pDir );
 836                                                 } while ( $pDir !== false // sanity
 837                                                         && strcmp( $pDir, $lastDir ) > 0 // not done already
 838                                                         && strlen( $pDir ) > strlen( $dir ) // within $dir
 839                                                 );
 840                                         }
 841                                         $lastDir = $objectDir;
 842                                 }
 843                         }
 844                 }
 845                 // Page on the unfiltered directory listing (what is returned may be filtered)
 846                 if ( count( $objects ) < $limit ) {
 847                         $after = INF; // avoid a second RTT
 848                 } else {
 849                         $after = end( $objects ); // update last item
 850                 }
 851
 852                 return $dirs;
 853         }
 854
 855         /**
 856          * Do not call this function outside of SwiftFileBackendFileList
 857          *
 858          * @param string $fullCont Resolved container name
 859          * @param string $dir Resolved storage directory with no trailing slash
 860          * @param string|null $after Resolved container relative path of file to list items after
 861          * @param int $limit Max number of items to list
 862          * @param array $params Parameters for getDirectoryList()
 863          * @return array List of resolved container relative paths of files under $dir
 864          * @throws FileBackendError
 865          */
 866         public function getFileListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
 867                 $files = array(); // list of (path, stat array or null) entries
 868                 if ( $after === INF ) {
 869                         return $files; // nothing more
 870                 }
 871
 872                 $section = new ProfileSection( __METHOD__ . '-' . $this->name );
 873
 874                 $prefix = ( $dir == '' ) ? null : "{$dir}/";
 875                 // $objects will contain a list of unfiltered names or CF_Object items
 876                 // Non-recursive: only list files right under $dir
 877                 if ( !empty( $params['topOnly'] ) ) {
 878                         if ( !empty( $params['adviseStat'] ) ) {
 879                                 $status = $this->objectListing( $fullCont, 'info', $limit, $after, $prefix, '/' );
 880                         } else {
 881                                 $status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix, '/' );
 882                         }
 883                 } else {
 884                         // Recursive: list all files under $dir and its subdirs
 885                         if ( !empty( $params['adviseStat'] ) ) {
 886                                 $status = $this->objectListing( $fullCont, 'info', $limit, $after, $prefix );
 887                         } else {
 888                                 $status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix );
 889                         }
 890                 }
 891
 892                 // Reformat this list into a list of (name, stat array or null) entries
 893                 if ( !$status->isOk() ) {
 894                         return $files; // error
 895                 }
 896
 897                 $objects = $status->value;
 898                 $files = $this->buildFileObjectListing( $params, $dir, $objects );
 899
 900                 // Page on the unfiltered object listing (what is returned may be filtered)
 901                 if ( count( $objects ) < $limit ) {
 902                         $after = INF; // avoid a second RTT
 903                 } else {
 904                         $after = end( $objects ); // update last item
 905                         $after = is_object( $after ) ? $after->name : $after;
 906                 }
 907
 908                 return $files;
 909         }
 910
 911         /**
 912          * Build a list of file objects, filtering out any directories
 913          * and extracting any stat info if provided in $objects (for CF_Objects)
 914          *
 915          * @param array $params Parameters for getDirectoryList()
 916          * @param string $dir Resolved container directory path
 917          * @param array $objects List of CF_Object items or object names
 918          * @return array List of (names,stat array or null) entries
 919          */
 920         private function buildFileObjectListing( array $params, $dir, array $objects ) {
 921                 $names = array();
 922                 foreach ( $objects as $object ) {
 923                         if ( is_object( $object ) ) {
 924                                 if ( isset( $object->subdir ) || !isset( $object->name ) ) {
 925                                         continue; // virtual directory entry; ignore
 926                                 }
 927                                 $stat = array(
 928                                         // Convert various random Swift dates to TS_MW
 929                                         'mtime'  => $this->convertSwiftDate( $object->last_modified, TS_MW ),
 930                                         'size'   => (int)$object->bytes,
 931                                         // Note: manifiest ETags are not an MD5 of the file
 932                                         'md5'    => ctype_xdigit( $object->hash ) ? $object->hash : null,
 933                                         'latest' => false // eventually consistent
 934                                 );
 935                                 $names[] = array( $object->name, $stat );
 936                         } elseif ( substr( $object, -1 ) !== '/' ) {
 937                                 // Omit directories, which end in '/' in listings
 938                                 $names[] = array( $object, null );
 939                         }
 940                 }
 941
 942                 return $names;
 943         }
 944
 945         /**
 946          * Do not call this function outside of SwiftFileBackendFileList
 947          *
 948          * @param string $path Storage path
 949          * @param array $val Stat value
 950          */
 951         public function loadListingStatInternal( $path, array $val ) {
 952                 $this->cheapCache->set( $path, 'stat', $val );
 953         }
 954
 955         protected function doGetFileXAttributes( array $params ) {
 956                 $stat = $this->getFileStat( $params );
 957                 if ( $stat ) {
 958                         if ( !isset( $stat['xattr'] ) ) {
 959                                 // Stat entries filled by file listings don't include metadata/headers
 960                                 $this->clearCache( array( $params['src'] ) );
 961                                 $stat = $this->getFileStat( $params );
 962                         }
 963
 964                         return $stat['xattr'];
 965                 } else {
 966                         return false;
 967                 }
 968         }
 969
 970         protected function doGetFileSha1base36( array $params ) {
 971                 $stat = $this->getFileStat( $params );
 972                 if ( $stat ) {
 973                         if ( !isset( $stat['sha1'] ) ) {
 974                                 // Stat entries filled by file listings don't include SHA1
 975                                 $this->clearCache( array( $params['src'] ) );
 976                                 $stat = $this->getFileStat( $params );
 977                         }
 978
 979                         return $stat['sha1'];
 980                 } else {
 981                         return false;
 982                 }
 983         }
 984
 985         protected function doStreamFile( array $params ) {
 986                 $status = Status::newGood();
 987
 988                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 989                 if ( $srcRel === null ) {
 990                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 991                 }
 992
 993                 $auth = $this->getAuthentication();
 994                 if ( !$auth || !is_array( $this->getContainerStat( $srcCont ) ) ) {
 995                         $status->fatal( 'backend-fail-stream', $params['src'] );
 996
 997                         return $status;
 998                 }
 999
1000                 $handle = fopen( 'php://output', 'wb' );
1001
1002                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1003                         'method' => 'GET',
1004                         'url' => $this->storageUrl( $auth, $srcCont, $srcRel ),
1005                         'headers' => $this->authTokenHeaders( $auth )
1006                                 + $this->headersFromParams( $params ),
1007                         'stream' => $handle,
1008                 ) );
1009
1010                 if ( $rcode >= 200 && $rcode <= 299 ) {
1011                         // good
1012                 } elseif ( $rcode === 404 ) {
1013                         $status->fatal( 'backend-fail-stream', $params['src'] );
1014                 } else {
1015                         $this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
1016                 }
1017
1018                 return $status;
1019         }
1020
1021         protected function doGetLocalCopyMulti( array $params ) {
1022                 $tmpFiles = array();
1023
1024                 $auth = $this->getAuthentication();
1025
1026                 $ep = array_diff_key( $params, array( 'srcs' => 1 ) ); // for error logging
1027                 // Blindly create tmp files and stream to them, catching any exception if the file does
1028                 // not exist. Doing a stat here is useless causes infinite loops in addMissingMetadata().
1029                 $reqs = array(); // (path => op)
1030
1031                 foreach ( $params['srcs'] as $path ) { // each path in this concurrent batch
1032                         list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
1033                         if ( $srcRel === null || !$auth ) {
1034                                 $tmpFiles[$path] = null;
1035                                 continue;
1036                         }
1037                         // Get source file extension
1038                         $ext = FileBackend::extensionFromPath( $path );
1039                         // Create a new temporary file...
1040                         $tmpFile = TempFSFile::factory( 'localcopy_', $ext );
1041                         if ( $tmpFile ) {
1042                                 $handle = fopen( $tmpFile->getPath(), 'wb' );
1043                                 if ( $handle ) {
1044                                         $reqs[$path] = array(
1045                                                 'method'  => 'GET',
1046                                                 'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
1047                                                 'headers' => $this->authTokenHeaders( $auth )
1048                                                         + $this->headersFromParams( $params ),
1049                                                 'stream'  => $handle,
1050                                         );
1051                                 } else {
1052                                         $tmpFile = null;
1053                                 }
1054                         }
1055                         $tmpFiles[$path] = $tmpFile;
1056                 }
1057
1058                 $opts = array( 'maxConnsPerHost' => $params['concurrency'] );
1059                 $reqs = $this->http->runMulti( $reqs, $opts );
1060                 foreach ( $reqs as $path => $op ) {
1061                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $op['response'];
1062                         fclose( $op['stream'] ); // close open handle
1063                         if ( $rcode >= 200 && $rcode <= 299
1064                                 // double check that the disk is not full/broken
1065                                 && $tmpFiles[$path]->getSize() == $rhdrs['content-length']
1066                         ) {
1067                                 // good
1068                         } elseif ( $rcode === 404 ) {
1069                                 $tmpFiles[$path] = false;
1070                         } else {
1071                                 $tmpFiles[$path] = null;
1072                                 $this->onError( null, __METHOD__,
1073                                         array( 'src' => $path ) + $ep, $rerr, $rcode, $rdesc );
1074                         }
1075                 }
1076
1077                 return $tmpFiles;
1078         }
1079
1080         public function getFileHttpUrl( array $params ) {
1081                 if ( $this->swiftTempUrlKey != '' ||
1082                         ( $this->rgwS3AccessKey != '' && $this->rgwS3SecretKey != '' )
1083                 ) {
1084                         list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
1085                         if ( $srcRel === null ) {
1086                                 return null; // invalid path
1087                         }
1088
1089                         $auth = $this->getAuthentication();
1090                         if ( !$auth ) {
1091                                 return null;
1092                         }
1093
1094                         $ttl = isset( $params['ttl'] ) ? $params['ttl'] : 86400;
1095                         $expires = time() + $ttl;
1096
1097                         if ( $this->swiftTempUrlKey != '' ) {
1098                                 $url = $this->storageUrl( $auth, $srcCont, $srcRel );
1099                                 // Swift wants the signature based on the unencoded object name
1100                                 $contPath = parse_url( $this->storageUrl( $auth, $srcCont ), PHP_URL_PATH );
1101                                 $signature = hash_hmac( 'sha1',
1102                                         "GET\n{$expires}\n{$contPath}/{$srcRel}",
1103                                         $this->swiftTempUrlKey
1104                                 );
1105
1106                                 return "{$url}?temp_url_sig={$signature}&temp_url_expires={$expires}";
1107                         } else { // give S3 API URL for rgw
1108                                 // Path for signature starts with the bucket
1109                                 $spath = '/' . rawurlencode( $srcCont ) . '/' .
1110                                         str_replace( '%2F', '/', rawurlencode( $srcRel ) );
1111                                 // Calculate the hash
1112                                 $signature = base64_encode( hash_hmac(
1113                                         'sha1',
1114                                         "GET\n\n\n{$expires}\n{$spath}",
1115                                         $this->rgwS3SecretKey,
1116                                         true // raw
1117                                 ) );
1118                                 // See http://s3.amazonaws.com/doc/s3-developer-guide/RESTAuthentication.html.
1119                                 // Note: adding a newline for empty CanonicalizedAmzHeaders does not work.
1120                                 return wfAppendQuery(
1121                                         str_replace( '/swift/v1', '', // S3 API is the rgw default
1122                                                 $this->storageUrl( $auth ) . $spath ),
1123                                         array(
1124                                                 'Signature' => $signature,
1125                                                 'Expires' => $expires,
1126                                                 'AWSAccessKeyId' => $this->rgwS3AccessKey )
1127                                 );
1128                         }
1129                 }
1130
1131                 return null;
1132         }
1133
1134         protected function directoriesAreVirtual() {
1135                 return true;
1136         }
1137
1138         /**
1139          * Get headers to send to Swift when reading a file based
1140          * on a FileBackend params array, e.g. that of getLocalCopy().
1141          * $params is currently only checked for a 'latest' flag.
1142          *
1143          * @param array $params
1144          * @return array
1145          */
1146         protected function headersFromParams( array $params ) {
1147                 $hdrs = array();
1148                 if ( !empty( $params['latest'] ) ) {
1149                         $hdrs['x-newest'] = 'true';
1150                 }
1151
1152                 return $hdrs;
1153         }
1154
1155         protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
1156                 $statuses = array();
1157
1158                 $auth = $this->getAuthentication();
1159                 if ( !$auth ) {
1160                         foreach ( $fileOpHandles as $index => $fileOpHandle ) {
1161                                 $statuses[$index] = Status::newFatal( 'backend-fail-connect', $this->name );
1162                         }
1163
1164                         return $statuses;
1165                 }
1166
1167                 // Split the HTTP requests into stages that can be done concurrently
1168                 $httpReqsByStage = array(); // map of (stage => index => HTTP request)
1169                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
1170                         $reqs = $fileOpHandle->httpOp;
1171                         // Convert the 'url' parameter to an actual URL using $auth
1172                         foreach ( $reqs as $stage => &$req ) {
1173                                 list( $container, $relPath ) = $req['url'];
1174                                 $req['url'] = $this->storageUrl( $auth, $container, $relPath );
1175                                 $req['headers'] = isset( $req['headers'] ) ? $req['headers'] : array();
1176                                 $req['headers'] = $this->authTokenHeaders( $auth ) + $req['headers'];
1177                                 $httpReqsByStage[$stage][$index] = $req;
1178                         }
1179                         $statuses[$index] = Status::newGood();
1180                 }
1181
1182                 // Run all requests for the first stage, then the next, and so on
1183                 $reqCount = count( $httpReqsByStage );
1184                 for ( $stage = 0; $stage < $reqCount; ++$stage ) {
1185                         $httpReqs = $this->http->runMulti( $httpReqsByStage[$stage] );
1186                         foreach ( $httpReqs as $index => $httpReq ) {
1187                                 // Run the callback for each request of this operation
1188                                 $callback = $fileOpHandles[$index]->callback;
1189                                 call_user_func_array( $callback, array( $httpReq, $statuses[$index] ) );
1190                                 // On failure, abort all remaining requests for this operation
1191                                 // (e.g. abort the DELETE request if the COPY request fails for a move)
1192                                 if ( !$statuses[$index]->isOK() ) {
1193                                         $stages = count( $fileOpHandles[$index]->httpOp );
1194                                         for ( $s = ( $stage + 1 ); $s < $stages; ++$s ) {
1195                                                 unset( $httpReqsByStage[$s][$index] );
1196                                         }
1197                                 }
1198                         }
1199                 }
1200
1201                 return $statuses;
1202         }
1203
1204         /**
1205          * Set read/write permissions for a Swift container.
1206          *
1207          * @see http://swift.openstack.org/misc.html#acls
1208          *
1209          * In general, we don't allow listings to end-users. It's not useful, isn't well-defined
1210          * (lists are truncated to 10000 item with no way to page), and is just a performance risk.
1211          *
1212          * @param string $container Resolved Swift container
1213          * @param array $readGrps List of the possible criteria for a request to have
1214          * access to read a container. Each item is one of the following formats:
1215          *   - account:user        : Grants access if the request is by the given user
1216          *   - ".r:<regex>"        : Grants access if the request is from a referrer host that
1217          *                           matches the expression and the request is not for a listing.
1218          *                           Setting this to '*' effectively makes a container public.
1219          *   -".rlistings:<regex>" : Grants access if the request is from a referrer host that
1220          *                           matches the expression and the request is for a listing.
1221          * @param array $writeGrps A list of the possible criteria for a request to have
1222          * access to write to a container. Each item is of the following format:
1223          *   - account:user       : Grants access if the request is by the given user
1224          * @return Status
1225          */
1226         protected function setContainerAccess( $container, array $readGrps, array $writeGrps ) {
1227                 $status = Status::newGood();
1228                 $auth = $this->getAuthentication();
1229
1230                 if ( !$auth ) {
1231                         $status->fatal( 'backend-fail-connect', $this->name );
1232
1233                         return $status;
1234                 }
1235
1236                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1237                         'method' => 'POST',
1238                         'url' => $this->storageUrl( $auth, $container ),
1239                         'headers' => $this->authTokenHeaders( $auth ) + array(
1240                                 'x-container-read' => implode( ',', $readGrps ),
1241                                 'x-container-write' => implode( ',', $writeGrps )
1242                         )
1243                 ) );
1244
1245                 if ( $rcode != 204 && $rcode !== 202 ) {
1246                         $status->fatal( 'backend-fail-internal', $this->name );
1247                 }
1248
1249                 return $status;
1250         }
1251
1252         /**
1253          * Get a Swift container stat array, possibly from process cache.
1254          * Use $reCache if the file count or byte count is needed.
1255          *
1256          * @param string $container Container name
1257          * @param bool $bypassCache Bypass all caches and load from Swift
1258          * @return array|bool|null False on 404, null on failure
1259          */
1260         protected function getContainerStat( $container, $bypassCache = false ) {
1261                 $section = new ProfileSection( __METHOD__ . '-' . $this->name );
1262
1263                 if ( $bypassCache ) { // purge cache
1264                         $this->containerStatCache->clear( $container );
1265                 } elseif ( !$this->containerStatCache->has( $container, 'stat' ) ) {
1266                         $this->primeContainerCache( array( $container ) ); // check persistent cache
1267                 }
1268                 if ( !$this->containerStatCache->has( $container, 'stat' ) ) {
1269                         $auth = $this->getAuthentication();
1270                         if ( !$auth ) {
1271                                 return null;
1272                         }
1273
1274                         wfProfileIn( __METHOD__. "-{$this->name}-miss" );
1275                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1276                                 'method' => 'HEAD',
1277                                 'url' => $this->storageUrl( $auth, $container ),
1278                                 'headers' => $this->authTokenHeaders( $auth )
1279                         ) );
1280                         wfProfileOut( __METHOD__ . "-{$this->name}-miss" );
1281
1282                         if ( $rcode === 204 ) {
1283                                 $stat = array(
1284                                         'count' => $rhdrs['x-container-object-count'],
1285                                         'bytes' => $rhdrs['x-container-bytes-used']
1286                                 );
1287                                 if ( $bypassCache ) {
1288                                         return $stat;
1289                                 } else {
1290                                         $this->containerStatCache->set( $container, 'stat', $stat ); // cache it
1291                                         $this->setContainerCache( $container, $stat ); // update persistent cache
1292                                 }
1293                         } elseif ( $rcode === 404 ) {
1294                                 return false;
1295                         } else {
1296                                 $this->onError( null, __METHOD__,
1297                                         array( 'cont' => $container ), $rerr, $rcode, $rdesc );
1298
1299                                 return null;
1300                         }
1301                 }
1302
1303                 return $this->containerStatCache->get( $container, 'stat' );
1304         }
1305
1306         /**
1307          * Create a Swift container
1308          *
1309          * @param string $container Container name
1310          * @param array $params
1311          * @return Status
1312          */
1313         protected function createContainer( $container, array $params ) {
1314                 $status = Status::newGood();
1315
1316                 $auth = $this->getAuthentication();
1317                 if ( !$auth ) {
1318                         $status->fatal( 'backend-fail-connect', $this->name );
1319
1320                         return $status;
1321                 }
1322
1323                 // @see SwiftFileBackend::setContainerAccess()
1324                 if ( empty( $params['noAccess'] ) ) {
1325                         $readGrps = array( '.r:*', $this->swiftUser ); // public
1326                 } else {
1327                         $readGrps = array( $this->swiftUser ); // private
1328                 }
1329                 $writeGrps = array( $this->swiftUser ); // sanity
1330
1331                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1332                         'method' => 'PUT',
1333                         'url' => $this->storageUrl( $auth, $container ),
1334                         'headers' => $this->authTokenHeaders( $auth ) + array(
1335                                 'x-container-read' => implode( ',', $readGrps ),
1336                                 'x-container-write' => implode( ',', $writeGrps )
1337                         )
1338                 ) );
1339
1340                 if ( $rcode === 201 ) { // new
1341                         // good
1342                 } elseif ( $rcode === 202 ) { // already there
1343                         // this shouldn't really happen, but is OK
1344                 } else {
1345                         $this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
1346                 }
1347
1348                 return $status;
1349         }
1350
1351         /**
1352          * Delete a Swift container
1353          *
1354          * @param string $container Container name
1355          * @param array $params
1356          * @return Status
1357          */
1358         protected function deleteContainer( $container, array $params ) {
1359                 $status = Status::newGood();
1360
1361                 $auth = $this->getAuthentication();
1362                 if ( !$auth ) {
1363                         $status->fatal( 'backend-fail-connect', $this->name );
1364
1365                         return $status;
1366                 }
1367
1368                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1369                         'method' => 'DELETE',
1370                         'url' => $this->storageUrl( $auth, $container ),
1371                         'headers' => $this->authTokenHeaders( $auth )
1372                 ) );
1373
1374                 if ( $rcode >= 200 && $rcode <= 299 ) { // deleted
1375                         $this->containerStatCache->clear( $container ); // purge
1376                 } elseif ( $rcode === 404 ) { // not there
1377                         // this shouldn't really happen, but is OK
1378                 } elseif ( $rcode === 409 ) { // not empty
1379                         $this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc ); // race?
1380                 } else {
1381                         $this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
1382                 }
1383
1384                 return $status;
1385         }
1386
1387         /**
1388          * Get a list of objects under a container.
1389          * Either just the names or a list of stdClass objects with details can be returned.
1390          *
1391          * @param string $fullCont
1392          * @param string $type ('info' for a list of object detail maps, 'names' for names only)
1393          * @param integer $limit
1394          * @param string|null $after
1395          * @param string|null $prefix
1396          * @param string|null $delim
1397          * @return Status With the list as value
1398          */
1399         private function objectListing(
1400                 $fullCont, $type, $limit, $after = null, $prefix = null, $delim = null
1401         ) {
1402                 $status = Status::newGood();
1403
1404                 $auth = $this->getAuthentication();
1405                 if ( !$auth ) {
1406                         $status->fatal( 'backend-fail-connect', $this->name );
1407
1408                         return $status;
1409                 }
1410
1411                 $query = array( 'limit' => $limit );
1412                 if ( $type === 'info' ) {
1413                         $query['format'] = 'json';
1414                 }
1415                 if ( $after !== null ) {
1416                         $query['marker'] = $after;
1417                 }
1418                 if ( $prefix !== null ) {
1419                         $query['prefix'] = $prefix;
1420                 }
1421                 if ( $delim !== null ) {
1422                         $query['delimiter'] = $delim;
1423                 }
1424
1425                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1426                         'method' => 'GET',
1427                         'url' => $this->storageUrl( $auth, $fullCont ),
1428                         'query' => $query,
1429                         'headers' => $this->authTokenHeaders( $auth )
1430                 ) );
1431
1432                 $params = array( 'cont' => $fullCont, 'prefix' => $prefix, 'delim' => $delim );
1433                 if ( $rcode === 200 ) { // good
1434                         if ( $type === 'info' ) {
1435                                 $status->value = FormatJson::decode( trim( $rbody ) );
1436                         } else {
1437                                 $status->value = explode( "\n", trim( $rbody ) );
1438                         }
1439                 } elseif ( $rcode === 204 ) {
1440                         $status->value = array(); // empty container
1441                 } elseif ( $rcode === 404 ) {
1442                         $status->value = array(); // no container
1443                 } else {
1444                         $this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
1445                 }
1446
1447                 return $status;
1448         }
1449
1450         protected function doPrimeContainerCache( array $containerInfo ) {
1451                 foreach ( $containerInfo as $container => $info ) {
1452                         $this->containerStatCache->set( $container, 'stat', $info );
1453                 }
1454         }
1455
1456         protected function doGetFileStatMulti( array $params ) {
1457                 $stats = array();
1458
1459                 $auth = $this->getAuthentication();
1460
1461                 $reqs = array();
1462                 foreach ( $params['srcs'] as $path ) {
1463                         list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
1464                         if ( $srcRel === null ) {
1465                                 $stats[$path] = false;
1466                                 continue; // invalid storage path
1467                         } elseif ( !$auth ) {
1468                                 $stats[$path] = null;
1469                                 continue;
1470                         }
1471
1472                         // (a) Check the container
1473                         $cstat = $this->getContainerStat( $srcCont );
1474                         if ( $cstat === false ) {
1475                                 $stats[$path] = false;
1476                                 continue; // ok, nothing to do
1477                         } elseif ( !is_array( $cstat ) ) {
1478                                 $stats[$path] = null;
1479                                 continue;
1480                         }
1481
1482                         $reqs[$path] = array(
1483                                 'method'  => 'HEAD',
1484                                 'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
1485                                 'headers' => $this->authTokenHeaders( $auth ) + $this->headersFromParams( $params )
1486                         );
1487                 }
1488
1489                 $opts = array( 'maxConnsPerHost' => $params['concurrency'] );
1490                 $reqs = $this->http->runMulti( $reqs, $opts );
1491
1492                 foreach ( $params['srcs'] as $path ) {
1493                         if ( array_key_exists( $path, $stats ) ) {
1494                                 continue; // some sort of failure above
1495                         }
1496                         // (b) Check the file
1497                         list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $reqs[$path]['response'];
1498                         if ( $rcode === 200 || $rcode === 204 ) {
1499                                 // Update the object if it is missing some headers
1500                                 $rhdrs = $this->addMissingMetadata( $rhdrs, $path );
1501                                 // Fetch all of the custom metadata headers
1502                                 $metadata = array();
1503                                 foreach ( $rhdrs as $name => $value ) {
1504                                         if ( strpos( $name, 'x-object-meta-' ) === 0 ) {
1505                                                 $metadata[substr( $name, strlen( 'x-object-meta-' ) )] = $value;
1506                                         }
1507                                 }
1508                                 // Fetch all of the custom raw HTTP headers
1509                                 $headers = $this->sanitizeHdrs( array( 'headers' => $rhdrs ) );
1510                                 $stat = array(
1511                                         // Convert various random Swift dates to TS_MW
1512                                         'mtime' => $this->convertSwiftDate( $rhdrs['last-modified'], TS_MW ),
1513                                         // Empty objects actually return no content-length header in Ceph
1514                                         'size'  => isset( $rhdrs['content-length'] ) ? (int)$rhdrs['content-length'] : 0,
1515                                         'sha1'  => $rhdrs[ 'x-object-meta-sha1base36'],
1516                                         // Note: manifiest ETags are not an MD5 of the file
1517                                         'md5'   => ctype_xdigit( $rhdrs['etag'] ) ? $rhdrs['etag'] : null,
1518                                         'xattr' => array( 'metadata' => $metadata, 'headers' => $headers )
1519                                 );
1520                         } elseif ( $rcode === 404 ) {
1521                                 $stat = false;
1522                         } else {
1523                                 $stat = null;
1524                                 $this->onError( null, __METHOD__, $params, $rerr, $rcode, $rdesc );
1525                         }
1526                         $stats[$path] = $stat;
1527                 }
1528
1529                 return $stats;
1530         }
1531
1532         /**
1533          * @return array|null Credential map
1534          */
1535         protected function getAuthentication() {
1536                 if ( $this->authErrorTimestamp !== null ) {
1537                         if ( ( time() - $this->authErrorTimestamp ) < 60 ) {
1538                                 return null; // failed last attempt; don't bother
1539                         } else { // actually retry this time
1540                                 $this->authErrorTimestamp = null;
1541                         }
1542                 }
1543                 // Session keys expire after a while, so we renew them periodically
1544                 $reAuth = ( ( time() - $this->authSessionTimestamp ) > $this->authTTL );
1545                 // Authenticate with proxy and get a session key...
1546                 if ( !$this->authCreds || $reAuth ) {
1547                         $this->authSessionTimestamp = 0;
1548                         $cacheKey = $this->getCredsCacheKey( $this->swiftUser );
1549                         $creds = $this->srvCache->get( $cacheKey ); // credentials
1550                         // Try to use the credential cache
1551                         if ( isset( $creds['auth_token'] ) && isset( $creds['storage_url'] ) ) {
1552                                 $this->authCreds = $creds;
1553                                 // Skew the timestamp for worst case to avoid using stale credentials
1554                                 $this->authSessionTimestamp = time() - ceil( $this->authTTL / 2 );
1555                         } else { // cache miss
1556                                 list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( array(
1557                                         'method' => 'GET',
1558                                         'url' => "{$this->swiftAuthUrl}/v1.0",
1559                                         'headers' => array(
1560                                                 'x-auth-user' => $this->swiftUser,
1561                                                 'x-auth-key' => $this->swiftKey
1562                                         )
1563                                 ) );
1564
1565                                 if ( $rcode >= 200 && $rcode <= 299 ) { // OK
1566                                         $this->authCreds = array(
1567                                                 'auth_token' => $rhdrs['x-auth-token'],
1568                                                 'storage_url' => $rhdrs['x-storage-url']
1569                                         );
1570                                         $this->srvCache->set( $cacheKey, $this->authCreds, ceil( $this->authTTL / 2 ) );
1571                                         $this->authSessionTimestamp = time();
1572                                 } elseif ( $rcode === 401 ) {
1573                                         $this->onError( null, __METHOD__, array(), "Authentication failed.", $rcode );
1574                                         $this->authErrorTimestamp = time();
1575
1576                                         return null;
1577                                 } else {
1578                                         $this->onError( null, __METHOD__, array(), "HTTP return code: $rcode", $rcode );
1579                                         $this->authErrorTimestamp = time();
1580
1581                                         return null;
1582                                 }
1583                         }
1584                 }
1585
1586                 return $this->authCreds;
1587         }
1588
1589         /**
1590          * @param array $creds From getAuthentication()
1591          * @param string $container
1592          * @param string $object
1593          * @return array
1594          */
1595         protected function storageUrl( array $creds, $container = null, $object = null ) {
1596                 $parts = array( $creds['storage_url'] );
1597                 if ( strlen( $container ) ) {
1598                         $parts[] = rawurlencode( $container );
1599                 }
1600                 if ( strlen( $object ) ) {
1601                         $parts[] = str_replace( "%2F", "/", rawurlencode( $object ) );
1602                 }
1603
1604                 return implode( '/', $parts );
1605         }
1606
1607         /**
1608          * @param array $creds From getAuthentication()
1609          * @return array
1610          */
1611         protected function authTokenHeaders( array $creds ) {
1612                 return array( 'x-auth-token' => $creds['auth_token'] );
1613         }
1614
1615         /**
1616          * Get the cache key for a container
1617          *
1618          * @param string $username
1619          * @return string
1620          */
1621         private function getCredsCacheKey( $username ) {
1622                 return 'swiftcredentials:' . md5( $username . ':' . $this->swiftAuthUrl );
1623         }
1624
1625         /**
1626          * Log an unexpected exception for this backend.
1627          * This also sets the Status object to have a fatal error.
1628          *
1629          * @param Status|null $status
1630          * @param string $func
1631          * @param array $params
1632          * @param string $err Error string
1633          * @param integer $code HTTP status
1634          * @param string $desc HTTP status description
1635          */
1636         public function onError( $status, $func, array $params, $err = '', $code = 0, $desc = '' ) {
1637                 if ( $status instanceof Status ) {
1638                         $status->fatal( 'backend-fail-internal', $this->name );
1639                 }
1640                 if ( $code == 401 ) { // possibly a stale token
1641                         $this->srvCache->delete( $this->getCredsCacheKey( $this->swiftUser ) );
1642                 }
1643                 wfDebugLog( 'SwiftBackend',
1644                         "HTTP $code ($desc) in '{$func}' (given '" . FormatJson::encode( $params ) . "')" .
1645                         ( $err ? ": $err" : "" )
1646                 );
1647         }
1648 }
1649
1650 /**
1651  * @see FileBackendStoreOpHandle
1652  */
1653 class SwiftFileOpHandle extends FileBackendStoreOpHandle {
1654         /** @var array List of Requests for MultiHttpClient */
1655         public $httpOp;
1656         /** @var Closure */
1657         public $callback;
1658
1659         /**
1660          * @param SwiftFileBackend $backend
1661          * @param Closure $callback Function that takes (HTTP request array, status)
1662          * @param array $httpOp MultiHttpClient op
1663          */
1664         public function __construct( SwiftFileBackend $backend, Closure $callback, array $httpOp ) {
1665                 $this->backend = $backend;
1666                 $this->callback = $callback;
1667                 $this->httpOp = $httpOp;
1668         }
1669 }
1670
1671 /**
1672  * SwiftFileBackend helper class to page through listings.
1673  * Swift also has a listing limit of 10,000 objects for sanity.
1674  * Do not use this class from places outside SwiftFileBackend.
1675  *
1676  * @ingroup FileBackend
1677  */
1678 abstract class SwiftFileBackendList implements Iterator {
1679         /** @var array List of path or (path,stat array) entries */
1680         protected $bufferIter = array();
1681
1682         /** @var string List items *after* this path */
1683         protected $bufferAfter = null;
1684
1685         /** @var int */
1686         protected $pos = 0;
1687
1688         /** @var array */
1689         protected $params = array();
1690
1691         /** @var SwiftFileBackend */
1692         protected $backend;
1693
1694         /** @var string Container name */
1695         protected $container;
1696
1697         /** @var string Storage directory */
1698         protected $dir;
1699
1700         /** @var int */
1701         protected $suffixStart;
1702
1703         const PAGE_SIZE = 9000; // file listing buffer size
1704
1705         /**
1706          * @param SwiftFileBackend $backend
1707          * @param string $fullCont Resolved container name
1708          * @param string $dir Resolved directory relative to container
1709          * @param array $params
1710          */
1711         public function __construct( SwiftFileBackend $backend, $fullCont, $dir, array $params ) {
1712                 $this->backend = $backend;
1713                 $this->container = $fullCont;
1714                 $this->dir = $dir;
1715                 if ( substr( $this->dir, -1 ) === '/' ) {
1716                         $this->dir = substr( $this->dir, 0, -1 ); // remove trailing slash
1717                 }
1718                 if ( $this->dir == '' ) { // whole container
1719                         $this->suffixStart = 0;
1720                 } else { // dir within container
1721                         $this->suffixStart = strlen( $this->dir ) + 1; // size of "path/to/dir/"
1722                 }
1723                 $this->params = $params;
1724         }
1725
1726         /**
1727          * @see Iterator::key()
1728          * @return int
1729          */
1730         public function key() {
1731                 return $this->pos;
1732         }
1733
1734         /**
1735          * @see Iterator::next()
1736          */
1737         public function next() {
1738                 // Advance to the next file in the page
1739                 next( $this->bufferIter );
1740                 ++$this->pos;
1741                 // Check if there are no files left in this page and
1742                 // advance to the next page if this page was not empty.
1743                 if ( !$this->valid() && count( $this->bufferIter ) ) {
1744                         $this->bufferIter = $this->pageFromList(
1745                                 $this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
1746                         ); // updates $this->bufferAfter
1747                 }
1748         }
1749
1750         /**
1751          * @see Iterator::rewind()
1752          */
1753         public function rewind() {
1754                 $this->pos = 0;
1755                 $this->bufferAfter = null;
1756                 $this->bufferIter = $this->pageFromList(
1757                         $this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
1758                 ); // updates $this->bufferAfter
1759         }
1760
1761         /**
1762          * @see Iterator::valid()
1763          * @return bool
1764          */
1765         public function valid() {
1766                 if ( $this->bufferIter === null ) {
1767                         return false; // some failure?
1768                 } else {
1769                         return ( current( $this->bufferIter ) !== false ); // no paths can have this value
1770                 }
1771         }
1772
1773         /**
1774          * Get the given list portion (page)
1775          *
1776          * @param string $container Resolved container name
1777          * @param string $dir Resolved path relative to container
1778          * @param string $after null
1779          * @param int $limit
1780          * @param array $params
1781          * @return Traversable|array
1782          */
1783         abstract protected function pageFromList( $container, $dir, &$after, $limit, array $params );
1784 }
1785
1786 /**
1787  * Iterator for listing directories
1788  */
1789 class SwiftFileBackendDirList extends SwiftFileBackendList {
1790         /**
1791          * @see Iterator::current()
1792          * @return string|bool String (relative path) or false
1793          */
1794         public function current() {
1795                 return substr( current( $this->bufferIter ), $this->suffixStart, -1 );
1796         }
1797
1798         protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
1799                 return $this->backend->getDirListPageInternal( $container, $dir, $after, $limit, $params );
1800         }
1801 }
1802
1803 /**
1804  * Iterator for listing regular files
1805  */
1806 class SwiftFileBackendFileList extends SwiftFileBackendList {
1807         /**
1808          * @see Iterator::current()
1809          * @return string|bool String (relative path) or false
1810          */
1811         public function current() {
1812                 list( $path, $stat ) = current( $this->bufferIter );
1813                 $relPath = substr( $path, $this->suffixStart );
1814                 if ( is_array( $stat ) ) {
1815                         $storageDir = rtrim( $this->params['dir'], '/' );
1816                         $this->backend->loadListingStatInternal( "$storageDir/$relPath", $stat );
1817                 }
1818
1819                 return $relPath;
1820         }
1821
1822         protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
1823                 return $this->backend->getFileListPageInternal( $container, $dir, $after, $limit, $params );
1824         }
1825 }