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 based file backend.
  28  *
  29  * This requires the SwiftCloudFiles MediaWiki extension, which includes
  30  * the php-cloudfiles library (https://github.com/rackspace/php-cloudfiles).
  31  * php-cloudfiles requires the curl, fileinfo, and mb_string PHP extensions.
  32  *
  33  * Status messages should avoid mentioning the Swift account name.
  34  * Likewise, error suppression should be used to avoid path disclosure.
  35  *
  36  * @ingroup FileBackend
  37  * @since 1.19
  38  */
  39 class SwiftFileBackend extends FileBackendStore {
  40         /** @var CF_Authentication */
  41         protected $auth; // Swift authentication handler
  42         protected $authTTL; // integer seconds
  43         protected $swiftAnonUser; // string; username to handle unauthenticated requests
  44         protected $swiftUseCDN; // boolean; whether CloudFiles CDN is enabled
  45         protected $swiftCDNExpiry; // integer; how long to cache things in the CDN
  46         protected $swiftCDNPurgable; // boolean; whether object CDN purging is enabled
  47
  48         /** @var CF_Connection */
  49         protected $conn; // Swift connection handle
  50         protected $sessionStarted = 0; // integer UNIX timestamp
  51
  52         /** @var CloudFilesException */
  53         protected $connException;
  54         protected $connErrorTime = 0; // UNIX timestamp
  55
  56         /** @var BagOStuff */
  57         protected $srvCache;
  58
  59         /** @var ProcessCacheLRU */
  60         protected $connContainerCache; // container object cache
  61
  62         /**
  63          * @see FileBackendStore::__construct()
  64          * Additional $config params include:
  65          *   - swiftAuthUrl       : Swift authentication server URL
  66          *   - swiftUser          : Swift user used by MediaWiki (account:username)
  67          *   - swiftKey           : Swift authentication key for the above user
  68          *   - swiftAuthTTL       : Swift authentication TTL (seconds)
  69          *   - swiftAnonUser      : Swift user used for end-user requests (account:username).
  70          *                          If set, then views of public containers are assumed to go
  71          *                          through this user. If not set, then public containers are
  72          *                          accessible to unauthenticated requests via ".r:*" in the ACL.
  73          *   - swiftUseCDN        : Whether a Cloud Files Content Delivery Network is set up
  74          *   - swiftCDNExpiry     : How long (in seconds) to store content in the CDN.
  75          *                          If files may likely change, this should probably not exceed
  76          *                          a few days. For example, deletions may take this long to apply.
  77          *                          If object purging is enabled, however, this is not an issue.
  78          *   - swiftCDNPurgable   : Whether object purge requests are allowed by the CDN.
  79          *   - shardViaHashLevels : Map of container names to sharding config with:
  80          *                             - base   : base of hash characters, 16 or 36
  81          *                             - levels : the number of hash levels (and digits)
  82          *                             - repeat : hash subdirectories are prefixed with all the
  83          *                                        parent hash directory names (e.g. "a/ab/abc")
  84          *   - cacheAuthInfo      : Whether to cache authentication tokens in APC, XCache, ect.
  85          *                          If those are not available, then the main cache will be used.
  86          *                          This is probably insecure in shared hosting environments.
  87          */
  88         public function __construct( array $config ) {
  89                 parent::__construct( $config );
  90                 if ( !MWInit::classExists( 'CF_Constants' ) ) {
  91                         throw new MWException( 'SwiftCloudFiles extension not installed.' );
  92                 }
  93                 // Required settings
  94                 $this->auth = new CF_Authentication(
  95                         $config['swiftUser'],
  96                         $config['swiftKey'],
  97                         null, // account; unused
  98                         $config['swiftAuthUrl']
  99                 );
 100                 // Optional settings
 101                 $this->authTTL = isset( $config['swiftAuthTTL'] )
 102                         ? $config['swiftAuthTTL']
 103                         : 5 * 60; // some sane number
 104                 $this->swiftAnonUser = isset( $config['swiftAnonUser'] )
 105                         ? $config['swiftAnonUser']
 106                         : '';
 107                 $this->shardViaHashLevels = isset( $config['shardViaHashLevels'] )
 108                         ? $config['shardViaHashLevels']
 109                         : '';
 110                 $this->swiftUseCDN = isset( $config['swiftUseCDN'] )
 111                         ? $config['swiftUseCDN']
 112                         : false;
 113                 $this->swiftCDNExpiry = isset( $config['swiftCDNExpiry'] )
 114                         ? $config['swiftCDNExpiry']
 115                         : 12*3600; // 12 hours is safe (tokens last 24 hours per http://docs.openstack.org)
 116                 $this->swiftCDNPurgable = isset( $config['swiftCDNPurgable'] )
 117                         ? $config['swiftCDNPurgable']
 118                         : true;
 119                 // Cache container information to mask latency
 120                 $this->memCache = wfGetMainCache();
 121                 // Process cache for container info
 122                 $this->connContainerCache = new ProcessCacheLRU( 300 );
 123                 // Cache auth token information to avoid RTTs
 124                 if ( !empty( $config['cacheAuthInfo'] ) ) {
 125                         if ( php_sapi_name() === 'cli' ) {
 126                                 $this->srvCache = wfGetMainCache(); // preferrably memcached
 127                         } else {
 128                                 try { // look for APC, XCache, WinCache, ect...
 129                                         $this->srvCache = ObjectCache::newAccelerator( array() );
 130                                 } catch ( Exception $e ) {}
 131                         }
 132                 }
 133                 $this->srvCache = $this->srvCache ? $this->srvCache : new EmptyBagOStuff();
 134         }
 135
 136         /**
 137          * @see FileBackendStore::resolveContainerPath()
 138          * @return null
 139          */
 140         protected function resolveContainerPath( $container, $relStoragePath ) {
 141                 if ( !mb_check_encoding( $relStoragePath, 'UTF-8' ) ) { // mb_string required by CF
 142                         return null; // not UTF-8, makes it hard to use CF and the swift HTTP API
 143                 } elseif ( strlen( urlencode( $relStoragePath ) ) > 1024 ) {
 144                         return null; // too long for Swift
 145                 }
 146                 return $relStoragePath;
 147         }
 148
 149         /**
 150          * @see FileBackendStore::isPathUsableInternal()
 151          * @return bool
 152          */
 153         public function isPathUsableInternal( $storagePath ) {
 154                 list( $container, $rel ) = $this->resolveStoragePathReal( $storagePath );
 155                 if ( $rel === null ) {
 156                         return false; // invalid
 157                 }
 158
 159                 try {
 160                         $this->getContainer( $container );
 161                         return true; // container exists
 162                 } catch ( NoSuchContainerException $e ) {
 163                 } catch ( CloudFilesException $e ) { // some other exception?
 164                         $this->handleException( $e, null, __METHOD__, array( 'path' => $storagePath ) );
 165                 }
 166
 167                 return false;
 168         }
 169
 170         /**
 171          * @param $disposition string Content-Disposition header value
 172          * @return string Truncated Content-Disposition header value to meet Swift limits
 173          */
 174         protected function truncDisp( $disposition ) {
 175                 $res = '';
 176                 foreach ( explode( ';', $disposition ) as $part ) {
 177                         $part = trim( $part );
 178                         $new  = ( $res === '' ) ? $part : "{$res};{$part}";
 179                         if ( strlen( $new ) <= 255 ) {
 180                                 $res = $new;
 181                         } else {
 182                                 break; // too long; sigh
 183                         }
 184                 }
 185                 return $res;
 186         }
 187
 188         /**
 189          * @see FileBackendStore::doCreateInternal()
 190          * @return Status
 191          */
 192         protected function doCreateInternal( array $params ) {
 193                 $status = Status::newGood();
 194
 195                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 196                 if ( $dstRel === null ) {
 197                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 198                         return $status;
 199                 }
 200
 201                 // (a) Check the destination container and object
 202                 try {
 203                         $dContObj = $this->getContainer( $dstCont );
 204                         if ( empty( $params['overwrite'] ) &&
 205                                 $this->fileExists( array( 'src' => $params['dst'], 'latest' => 1 ) ) )
 206                         {
 207                                 $status->fatal( 'backend-fail-alreadyexists', $params['dst'] );
 208                                 return $status;
 209                         }
 210                 } catch ( NoSuchContainerException $e ) {
 211                         $status->fatal( 'backend-fail-create', $params['dst'] );
 212                         return $status;
 213                 } catch ( CloudFilesException $e ) { // some other exception?
 214                         $this->handleException( $e, $status, __METHOD__, $params );
 215                         return $status;
 216                 }
 217
 218                 // (b) Get a SHA-1 hash of the object
 219                 $sha1Hash = wfBaseConvert( sha1( $params['content'] ), 16, 36, 31 );
 220
 221                 // (c) Actually create the object
 222                 try {
 223                         // Create a fresh CF_Object with no fields preloaded.
 224                         // We don't want to preserve headers, metadata, and such.
 225                         $obj = new CF_Object( $dContObj, $dstRel, false, false ); // skip HEAD
 226                         // Note: metadata keys stored as [Upper case char][[Lower case char]...]
 227                         $obj->metadata = array( 'Sha1base36' => $sha1Hash );
 228                         // Manually set the ETag (https://github.com/rackspace/php-cloudfiles/issues/59).
 229                         // The MD5 here will be checked within Swift against its own MD5.
 230                         $obj->set_etag( md5( $params['content'] ) );
 231                         // Use the same content type as StreamFile for security
 232                         $obj->content_type = StreamFile::contentTypeFromPath( $params['dst'] );
 233                         if ( !strlen( $obj->content_type ) ) { // special case
 234                                 $obj->content_type = 'unknown/unknown';
 235                         }
 236                         // Set the Content-Disposition header if requested
 237                         if ( isset( $params['disposition'] ) ) {
 238                                 $obj->headers['Content-Disposition'] = $this->truncDisp( $params['disposition'] );
 239                         }
 240                         if ( !empty( $params['async'] ) ) { // deferred
 241                                 $op = $obj->write_async( $params['content'] );
 242                                 $status->value = new SwiftFileOpHandle( $this, $params, 'Create', $op );
 243                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 244                                         $status->value->affectedObjects[] = $obj;
 245                                 }
 246                         } else { // actually write the object in Swift
 247                                 $obj->write( $params['content'] );
 248                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 249                                         $this->purgeCDNCache( array( $obj ) );
 250                                 }
 251                         }
 252                 } catch ( CDNNotEnabledException $e ) {
 253                         // CDN not enabled; nothing to see here
 254                 } catch ( BadContentTypeException $e ) {
 255                         $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 256                 } catch ( CloudFilesException $e ) { // some other exception?
 257                         $this->handleException( $e, $status, __METHOD__, $params );
 258                 }
 259
 260                 return $status;
 261         }
 262
 263         /**
 264          * @see SwiftFileBackend::doExecuteOpHandlesInternal()
 265          */
 266         protected function _getResponseCreate( CF_Async_Op $cfOp, Status $status, array $params ) {
 267                 try {
 268                         $cfOp->getLastResponse();
 269                 } catch ( BadContentTypeException $e ) {
 270                         $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 271                 }
 272         }
 273
 274         /**
 275          * @see FileBackendStore::doStoreInternal()
 276          * @return Status
 277          */
 278         protected function doStoreInternal( array $params ) {
 279                 $status = Status::newGood();
 280
 281                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 282                 if ( $dstRel === null ) {
 283                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 284                         return $status;
 285                 }
 286
 287                 // (a) Check the destination container and object
 288                 try {
 289                         $dContObj = $this->getContainer( $dstCont );
 290                         if ( empty( $params['overwrite'] ) &&
 291                                 $this->fileExists( array( 'src' => $params['dst'], 'latest' => 1 ) ) )
 292                         {
 293                                 $status->fatal( 'backend-fail-alreadyexists', $params['dst'] );
 294                                 return $status;
 295                         }
 296                 } catch ( NoSuchContainerException $e ) {
 297                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 298                         return $status;
 299                 } catch ( CloudFilesException $e ) { // some other exception?
 300                         $this->handleException( $e, $status, __METHOD__, $params );
 301                         return $status;
 302                 }
 303
 304                 // (b) Get a SHA-1 hash of the object
 305                 $sha1Hash = sha1_file( $params['src'] );
 306                 if ( $sha1Hash === false ) { // source doesn't exist?
 307                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 308                         return $status;
 309                 }
 310                 $sha1Hash = wfBaseConvert( $sha1Hash, 16, 36, 31 );
 311
 312                 // (c) Actually store the object
 313                 try {
 314                         // Create a fresh CF_Object with no fields preloaded.
 315                         // We don't want to preserve headers, metadata, and such.
 316                         $obj = new CF_Object( $dContObj, $dstRel, false, false ); // skip HEAD
 317                         // Note: metadata keys stored as [Upper case char][[Lower case char]...]
 318                         $obj->metadata = array( 'Sha1base36' => $sha1Hash );
 319                         // The MD5 here will be checked within Swift against its own MD5.
 320                         $obj->set_etag( md5_file( $params['src'] ) );
 321                         // Use the same content type as StreamFile for security
 322                         $obj->content_type = StreamFile::contentTypeFromPath( $params['dst'] );
 323                         if ( !strlen( $obj->content_type ) ) { // special case
 324                                 $obj->content_type = 'unknown/unknown';
 325                         }
 326                         // Set the Content-Disposition header if requested
 327                         if ( isset( $params['disposition'] ) ) {
 328                                 $obj->headers['Content-Disposition'] = $this->truncDisp( $params['disposition'] );
 329                         }
 330                         if ( !empty( $params['async'] ) ) { // deferred
 331                                 wfSuppressWarnings();
 332                                 $fp = fopen( $params['src'], 'rb' );
 333                                 wfRestoreWarnings();
 334                                 if ( !$fp ) {
 335                                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 336                                 } else {
 337                                         $op = $obj->write_async( $fp, filesize( $params['src'] ), true );
 338                                         $status->value = new SwiftFileOpHandle( $this, $params, 'Store', $op );
 339                                         $status->value->resourcesToClose[] = $fp;
 340                                         if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 341                                                 $status->value->affectedObjects[] = $obj;
 342                                         }
 343                                 }
 344                         } else { // actually write the object in Swift
 345                                 $obj->load_from_filename( $params['src'], true ); // calls $obj->write()
 346                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 347                                         $this->purgeCDNCache( array( $obj ) );
 348                                 }
 349                         }
 350                 } catch ( CDNNotEnabledException $e ) {
 351                         // CDN not enabled; nothing to see here
 352                 } catch ( BadContentTypeException $e ) {
 353                         $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 354                 } catch ( IOException $e ) {
 355                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 356                 } catch ( CloudFilesException $e ) { // some other exception?
 357                         $this->handleException( $e, $status, __METHOD__, $params );
 358                 }
 359
 360                 return $status;
 361         }
 362
 363         /**
 364          * @see SwiftFileBackend::doExecuteOpHandlesInternal()
 365          */
 366         protected function _getResponseStore( CF_Async_Op $cfOp, Status $status, array $params ) {
 367                 try {
 368                         $cfOp->getLastResponse();
 369                 } catch ( BadContentTypeException $e ) {
 370                         $status->fatal( 'backend-fail-contenttype', $params['dst'] );
 371                 } catch ( IOException $e ) {
 372                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 373                 }
 374         }
 375
 376         /**
 377          * @see FileBackendStore::doCopyInternal()
 378          * @return Status
 379          */
 380         protected function doCopyInternal( array $params ) {
 381                 $status = Status::newGood();
 382
 383                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 384                 if ( $srcRel === null ) {
 385                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 386                         return $status;
 387                 }
 388
 389                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 390                 if ( $dstRel === null ) {
 391                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 392                         return $status;
 393                 }
 394
 395                 // (a) Check the source/destination containers and destination object
 396                 try {
 397                         $sContObj = $this->getContainer( $srcCont );
 398                         $dContObj = $this->getContainer( $dstCont );
 399                         if ( empty( $params['overwrite'] ) &&
 400                                 $this->fileExists( array( 'src' => $params['dst'], 'latest' => 1 ) ) )
 401                         {
 402                                 $status->fatal( 'backend-fail-alreadyexists', $params['dst'] );
 403                                 return $status;
 404                         }
 405                 } catch ( NoSuchContainerException $e ) {
 406                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 407                         return $status;
 408                 } catch ( CloudFilesException $e ) { // some other exception?
 409                         $this->handleException( $e, $status, __METHOD__, $params );
 410                         return $status;
 411                 }
 412
 413                 // (b) Actually copy the file to the destination
 414                 try {
 415                         $dstObj = new CF_Object( $dContObj, $dstRel, false, false ); // skip HEAD
 416                         $hdrs = array(); // source file headers to override with new values
 417                         if ( isset( $params['disposition'] ) ) {
 418                                 $hdrs['Content-Disposition'] = $this->truncDisp( $params['disposition'] );
 419                         }
 420                         if ( !empty( $params['async'] ) ) { // deferred
 421                                 $op = $sContObj->copy_object_to_async( $srcRel, $dContObj, $dstRel, null, $hdrs );
 422                                 $status->value = new SwiftFileOpHandle( $this, $params, 'Copy', $op );
 423                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 424                                         $status->value->affectedObjects[] = $dstObj;
 425                                 }
 426                         } else { // actually write the object in Swift
 427                                 $sContObj->copy_object_to( $srcRel, $dContObj, $dstRel, null, $hdrs );
 428                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 429                                         $this->purgeCDNCache( array( $dstObj ) );
 430                                 }
 431                         }
 432                 } catch ( CDNNotEnabledException $e ) {
 433                         // CDN not enabled; nothing to see here
 434                 } catch ( NoSuchObjectException $e ) { // source object does not exist
 435                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 436                 } catch ( CloudFilesException $e ) { // some other exception?
 437                         $this->handleException( $e, $status, __METHOD__, $params );
 438                 }
 439
 440                 return $status;
 441         }
 442
 443         /**
 444          * @see SwiftFileBackend::doExecuteOpHandlesInternal()
 445          */
 446         protected function _getResponseCopy( CF_Async_Op $cfOp, Status $status, array $params ) {
 447                 try {
 448                         $cfOp->getLastResponse();
 449                 } catch ( NoSuchObjectException $e ) { // source object does not exist
 450                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 451                 }
 452         }
 453
 454         /**
 455          * @see FileBackendStore::doMoveInternal()
 456          * @return Status
 457          */
 458         protected function doMoveInternal( array $params ) {
 459                 $status = Status::newGood();
 460
 461                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 462                 if ( $srcRel === null ) {
 463                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 464                         return $status;
 465                 }
 466
 467                 list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
 468                 if ( $dstRel === null ) {
 469                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 470                         return $status;
 471                 }
 472
 473                 // (a) Check the source/destination containers and destination object
 474                 try {
 475                         $sContObj = $this->getContainer( $srcCont );
 476                         $dContObj = $this->getContainer( $dstCont );
 477                         if ( empty( $params['overwrite'] ) &&
 478                                 $this->fileExists( array( 'src' => $params['dst'], 'latest' => 1 ) ) )
 479                         {
 480                                 $status->fatal( 'backend-fail-alreadyexists', $params['dst'] );
 481                                 return $status;
 482                         }
 483                 } catch ( NoSuchContainerException $e ) {
 484                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 485                         return $status;
 486                 } catch ( CloudFilesException $e ) { // some other exception?
 487                         $this->handleException( $e, $status, __METHOD__, $params );
 488                         return $status;
 489                 }
 490
 491                 // (b) Actually move the file to the destination
 492                 try {
 493                         $srcObj = new CF_Object( $sContObj, $srcRel, false, false ); // skip HEAD
 494                         $dstObj = new CF_Object( $dContObj, $dstRel, false, false ); // skip HEAD
 495                         $hdrs = array(); // source file headers to override with new values
 496                         if ( isset( $params['disposition'] ) ) {
 497                                 $hdrs['Content-Disposition'] = $this->truncDisp( $params['disposition'] );
 498                         }
 499                         if ( !empty( $params['async'] ) ) { // deferred
 500                                 $op = $sContObj->move_object_to_async( $srcRel, $dContObj, $dstRel, null, $hdrs );
 501                                 $status->value = new SwiftFileOpHandle( $this, $params, 'Move', $op );
 502                                 $status->value->affectedObjects[] = $srcObj;
 503                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 504                                         $status->value->affectedObjects[] = $dstObj;
 505                                 }
 506                         } else { // actually write the object in Swift
 507                                 $sContObj->move_object_to( $srcRel, $dContObj, $dstRel, null, $hdrs );
 508                                 $this->purgeCDNCache( array( $srcObj ) );
 509                                 if ( !empty( $params['overwrite'] ) ) { // file possibly mutated
 510                                         $this->purgeCDNCache( array( $dstObj ) );
 511                                 }
 512                         }
 513                 } catch ( CDNNotEnabledException $e ) {
 514                         // CDN not enabled; nothing to see here
 515                 } catch ( NoSuchObjectException $e ) { // source object does not exist
 516                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 517                 } catch ( CloudFilesException $e ) { // some other exception?
 518                         $this->handleException( $e, $status, __METHOD__, $params );
 519                 }
 520
 521                 return $status;
 522         }
 523
 524         /**
 525          * @see SwiftFileBackend::doExecuteOpHandlesInternal()
 526          */
 527         protected function _getResponseMove( CF_Async_Op $cfOp, Status $status, array $params ) {
 528                 try {
 529                         $cfOp->getLastResponse();
 530                 } catch ( NoSuchObjectException $e ) { // source object does not exist
 531                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 532                 }
 533         }
 534
 535         /**
 536          * @see FileBackendStore::doDeleteInternal()
 537          * @return Status
 538          */
 539         protected function doDeleteInternal( array $params ) {
 540                 $status = Status::newGood();
 541
 542                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 543                 if ( $srcRel === null ) {
 544                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 545                         return $status;
 546                 }
 547
 548                 try {
 549                         $sContObj = $this->getContainer( $srcCont );
 550                         $srcObj = new CF_Object( $sContObj, $srcRel, false, false ); // skip HEAD
 551                         if ( !empty( $params['async'] ) ) { // deferred
 552                                 $op = $sContObj->delete_object_async( $srcRel );
 553                                 $status->value = new SwiftFileOpHandle( $this, $params, 'Delete', $op );
 554                                 $status->value->affectedObjects[] = $srcObj;
 555                         } else { // actually write the object in Swift
 556                                 $sContObj->delete_object( $srcRel );
 557                                 $this->purgeCDNCache( array( $srcObj ) );
 558                         }
 559                 } catch ( CDNNotEnabledException $e ) {
 560                         // CDN not enabled; nothing to see here
 561                 } catch ( NoSuchContainerException $e ) {
 562                         $status->fatal( 'backend-fail-delete', $params['src'] );
 563                 } catch ( NoSuchObjectException $e ) {
 564                         if ( empty( $params['ignoreMissingSource'] ) ) {
 565                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 566                         }
 567                 } catch ( CloudFilesException $e ) { // some other exception?
 568                         $this->handleException( $e, $status, __METHOD__, $params );
 569                 }
 570
 571                 return $status;
 572         }
 573
 574         /**
 575          * @see SwiftFileBackend::doExecuteOpHandlesInternal()
 576          */
 577         protected function _getResponseDelete( CF_Async_Op $cfOp, Status $status, array $params ) {
 578                 try {
 579                         $cfOp->getLastResponse();
 580                 } catch ( NoSuchContainerException $e ) {
 581                         $status->fatal( 'backend-fail-delete', $params['src'] );
 582                 } catch ( NoSuchObjectException $e ) {
 583                         if ( empty( $params['ignoreMissingSource'] ) ) {
 584                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 585                         }
 586                 }
 587         }
 588
 589         /**
 590          * @see FileBackendStore::doPrepareInternal()
 591          * @return Status
 592          */
 593         protected function doPrepareInternal( $fullCont, $dir, array $params ) {
 594                 $status = Status::newGood();
 595
 596                 // (a) Check if container already exists
 597                 try {
 598                         $contObj = $this->getContainer( $fullCont );
 599                         // NoSuchContainerException not thrown: container must exist
 600                         return $status; // already exists
 601                 } catch ( NoSuchContainerException $e ) {
 602                         // NoSuchContainerException thrown: container does not exist
 603                 } catch ( CloudFilesException $e ) { // some other exception?
 604                         $this->handleException( $e, $status, __METHOD__, $params );
 605                         return $status;
 606                 }
 607
 608                 // (b) Create container as needed
 609                 try {
 610                         $contObj = $this->createContainer( $fullCont );
 611                         if ( !empty( $params['noAccess'] ) ) {
 612                                 // Make container private to end-users...
 613                                 $status->merge( $this->doSecureInternal( $fullCont, $dir, $params ) );
 614                         } else {
 615                                 // Make container public to end-users...
 616                                 $status->merge( $this->doPublishInternal( $fullCont, $dir, $params ) );
 617                         }
 618                         if ( $this->swiftUseCDN ) { // Rackspace style CDN
 619                                 $contObj->make_public( $this->swiftCDNExpiry );
 620                         }
 621                 } catch ( CDNNotEnabledException $e ) {
 622                         // CDN not enabled; nothing to see here
 623                 } catch ( CloudFilesException $e ) { // some other exception?
 624                         $this->handleException( $e, $status, __METHOD__, $params );
 625                         return $status;
 626                 }
 627
 628                 return $status;
 629         }
 630
 631         /**
 632          * @see FileBackendStore::doSecureInternal()
 633          * @return Status
 634          */
 635         protected function doSecureInternal( $fullCont, $dir, array $params ) {
 636                 $status = Status::newGood();
 637                 if ( empty( $params['noAccess'] ) ) {
 638                         return $status; // nothing to do
 639                 }
 640
 641                 // Restrict container from end-users...
 642                 try {
 643                         // doPrepareInternal() should have been called,
 644                         // so the Swift container should already exist...
 645                         $contObj = $this->getContainer( $fullCont ); // normally a cache hit
 646                         // NoSuchContainerException not thrown: container must exist
 647
 648                         // Make container private to end-users...
 649                         $status->merge( $this->setContainerAccess(
 650                                 $contObj,
 651                                 array( $this->auth->username ), // read
 652                                 array( $this->auth->username ) // write
 653                         ) );
 654                         if ( $this->swiftUseCDN && $contObj->is_public() ) { // Rackspace style CDN
 655                                 $contObj->make_private();
 656                         }
 657                 } catch ( CDNNotEnabledException $e ) {
 658                         // CDN not enabled; nothing to see here
 659                 } catch ( CloudFilesException $e ) { // some other exception?
 660                         $this->handleException( $e, $status, __METHOD__, $params );
 661                 }
 662
 663                 return $status;
 664         }
 665
 666         /**
 667          * @see FileBackendStore::doPublishInternal()
 668          * @return Status
 669          */
 670         protected function doPublishInternal( $fullCont, $dir, array $params ) {
 671                 $status = Status::newGood();
 672
 673                 // Unrestrict container from end-users...
 674                 try {
 675                         // doPrepareInternal() should have been called,
 676                         // so the Swift container should already exist...
 677                         $contObj = $this->getContainer( $fullCont ); // normally a cache hit
 678                         // NoSuchContainerException not thrown: container must exist
 679
 680                         // Make container public to end-users...
 681                         if ( $this->swiftAnonUser != '' ) {
 682                                 $status->merge( $this->setContainerAccess(
 683                                         $contObj,
 684                                         array( $this->auth->username, $this->swiftAnonUser ), // read
 685                                         array( $this->auth->username, $this->swiftAnonUser ) // write
 686                                 ) );
 687                         } else {
 688                                 $status->merge( $this->setContainerAccess(
 689                                         $contObj,
 690                                         array( $this->auth->username, '.r:*' ), // read
 691                                         array( $this->auth->username ) // write
 692                                 ) );
 693                         }
 694                         if ( $this->swiftUseCDN && !$contObj->is_public() ) { // Rackspace style CDN
 695                                 $contObj->make_public();
 696                         }
 697                 } catch ( CDNNotEnabledException $e ) {
 698                         // CDN not enabled; nothing to see here
 699                 } catch ( CloudFilesException $e ) { // some other exception?
 700                         $this->handleException( $e, $status, __METHOD__, $params );
 701                 }
 702
 703                 return $status;
 704         }
 705
 706         /**
 707          * @see FileBackendStore::doCleanInternal()
 708          * @return Status
 709          */
 710         protected function doCleanInternal( $fullCont, $dir, array $params ) {
 711                 $status = Status::newGood();
 712
 713                 // Only containers themselves can be removed, all else is virtual
 714                 if ( $dir != '' ) {
 715                         return $status; // nothing to do
 716                 }
 717
 718                 // (a) Check the container
 719                 try {
 720                         $contObj = $this->getContainer( $fullCont, true );
 721                 } catch ( NoSuchContainerException $e ) {
 722                         return $status; // ok, nothing to do
 723                 } catch ( CloudFilesException $e ) { // some other exception?
 724                         $this->handleException( $e, $status, __METHOD__, $params );
 725                         return $status;
 726                 }
 727
 728                 // (b) Delete the container if empty
 729                 if ( $contObj->object_count == 0 ) {
 730                         try {
 731                                 $this->deleteContainer( $fullCont );
 732                         } catch ( NoSuchContainerException $e ) {
 733                                 return $status; // race?
 734                         } catch ( NonEmptyContainerException $e ) {
 735                                 return $status; // race? consistency delay?
 736                         } catch ( CloudFilesException $e ) { // some other exception?
 737                                 $this->handleException( $e, $status, __METHOD__, $params );
 738                                 return $status;
 739                         }
 740                 }
 741
 742                 return $status;
 743         }
 744
 745         /**
 746          * @see FileBackendStore::doFileExists()
 747          * @return array|bool|null
 748          */
 749         protected function doGetFileStat( array $params ) {
 750                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
 751                 if ( $srcRel === null ) {
 752                         return false; // invalid storage path
 753                 }
 754
 755                 $stat = false;
 756                 try {
 757                         $contObj = $this->getContainer( $srcCont );
 758                         $srcObj = $contObj->get_object( $srcRel, $this->headersFromParams( $params ) );
 759                         $this->addMissingMetadata( $srcObj, $params['src'] );
 760                         $stat = array(
 761                                 // Convert dates like "Tue, 03 Jan 2012 22:01:04 GMT" to TS_MW
 762                                 'mtime' => wfTimestamp( TS_MW, $srcObj->last_modified ),
 763                                 'size'  => (int)$srcObj->content_length,
 764                                 'sha1'  => $srcObj->metadata['Sha1base36']
 765                         );
 766                 } catch ( NoSuchContainerException $e ) {
 767                 } catch ( NoSuchObjectException $e ) {
 768                 } catch ( CloudFilesException $e ) { // some other exception?
 769                         $stat = null;
 770                         $this->handleException( $e, null, __METHOD__, $params );
 771                 }
 772
 773                 return $stat;
 774         }
 775
 776         /**
 777          * Fill in any missing object metadata and save it to Swift
 778          *
 779          * @param $obj CF_Object
 780          * @param $path string Storage path to object
 781          * @return bool Success
 782          * @throws Exception cloudfiles exceptions
 783          */
 784         protected function addMissingMetadata( CF_Object $obj, $path ) {
 785                 if ( isset( $obj->metadata['Sha1base36'] ) ) {
 786                         return true; // nothing to do
 787                 }
 788                 wfProfileIn( __METHOD__ );
 789                 $status = Status::newGood();
 790                 $scopeLockS = $this->getScopedFileLocks( array( $path ), LockManager::LOCK_UW, $status );
 791                 if ( $status->isOK() ) {
 792                         $tmpFile = $this->getLocalCopy( array( 'src' => $path, 'latest' => 1 ) );
 793                         if ( $tmpFile ) {
 794                                 $hash = $tmpFile->getSha1Base36();
 795                                 if ( $hash !== false ) {
 796                                         $obj->metadata['Sha1base36'] = $hash;
 797                                         $obj->sync_metadata(); // save to Swift
 798                                         wfProfileOut( __METHOD__ );
 799                                         return true; // success
 800                                 }
 801                         }
 802                 }
 803                 $obj->metadata['Sha1base36'] = false;
 804                 wfProfileOut( __METHOD__ );
 805                 return false; // failed
 806         }
 807
 808         /**
 809          * @see FileBackendStore::doGetFileContentsMulti()
 810          * @return Array
 811          */
 812         protected function doGetFileContentsMulti( array $params ) {
 813                 $contents = array();
 814
 815                 $ep = array_diff_key( $params, array( 'srcs' => 1 ) ); // for error logging
 816                 // Blindly create tmp files and stream to them, catching any exception if the file does
 817                 // not exist. Doing stats here is useless and will loop infinitely in addMissingMetadata().
 818                 foreach ( array_chunk( $params['srcs'], $params['concurrency'] ) as $pathBatch ) {
 819                         $cfOps = array(); // (path => CF_Async_Op)
 820
 821                         foreach ( $pathBatch as $path ) { // each path in this concurrent batch
 822                                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
 823                                 if ( $srcRel === null ) {
 824                                         $contents[$path] = false;
 825                                         continue;
 826                                 }
 827                                 $data = false;
 828                                 try {
 829                                         $sContObj = $this->getContainer( $srcCont );
 830                                         $obj = new CF_Object( $sContObj, $srcRel, false, false ); // skip HEAD
 831                                         // Get source file extension
 832                                         $ext = FileBackend::extensionFromPath( $path );
 833                                         // Create a new temporary memory file...
 834                                         $handle = fopen( 'php://temp', 'wb' );
 835                                         if ( $handle ) {
 836                                                 $headers = $this->headersFromParams( $params );
 837                                                 if ( count( $pathBatch ) > 1 ) {
 838                                                         $cfOps[$path] = $obj->stream_async( $handle, $headers );
 839                                                         $cfOps[$path]->_file_handle = $handle; // close this later
 840                                                 } else {
 841                                                         $obj->stream( $handle, $headers );
 842                                                         rewind( $handle ); // start from the beginning
 843                                                         $data = stream_get_contents( $handle );
 844                                                         fclose( $handle );
 845                                                 }
 846                                         } else {
 847                                                 $data = false;
 848                                         }
 849                                 } catch ( NoSuchContainerException $e ) {
 850                                         $data = false;
 851                                 } catch ( NoSuchObjectException $e ) {
 852                                         $data = false;
 853                                 } catch ( CloudFilesException $e ) { // some other exception?
 854                                         $data = false;
 855                                         $this->handleException( $e, null, __METHOD__, array( 'src' => $path ) + $ep );
 856                                 }
 857                                 $contents[$path] = $data;
 858                         }
 859
 860                         $batch = new CF_Async_Op_Batch( $cfOps );
 861                         $cfOps = $batch->execute();
 862                         foreach ( $cfOps as $path => $cfOp ) {
 863                                 try {
 864                                         $cfOp->getLastResponse();
 865                                         rewind( $cfOp->_file_handle ); // start from the beginning
 866                                         $contents[$path] = stream_get_contents( $cfOp->_file_handle );
 867                                 } catch ( NoSuchContainerException $e ) {
 868                                         $contents[$path] = false;
 869                                 } catch ( NoSuchObjectException $e ) {
 870                                         $contents[$path] = false;
 871                                 } catch ( CloudFilesException $e ) { // some other exception?
 872                                         $contents[$path] = false;
 873                                         $this->handleException( $e, null, __METHOD__, array( 'src' => $path ) + $ep );
 874                                 }
 875                                 fclose( $cfOp->_file_handle ); // close open handle
 876                         }
 877                 }
 878
 879                 return $contents;
 880         }
 881
 882         /**
 883          * @see FileBackendStore::doDirectoryExists()
 884          * @return bool|null
 885          */
 886         protected function doDirectoryExists( $fullCont, $dir, array $params ) {
 887                 try {
 888                         $container = $this->getContainer( $fullCont );
 889                         $prefix = ( $dir == '' ) ? null : "{$dir}/";
 890                         return ( count( $container->list_objects( 1, null, $prefix ) ) > 0 );
 891                 } catch ( NoSuchContainerException $e ) {
 892                         return false;
 893                 } catch ( CloudFilesException $e ) { // some other exception?
 894                         $this->handleException( $e, null, __METHOD__,
 895                                 array( 'cont' => $fullCont, 'dir' => $dir ) );
 896                 }
 897
 898                 return null; // error
 899         }
 900
 901         /**
 902          * @see FileBackendStore::getDirectoryListInternal()
 903          * @return SwiftFileBackendDirList
 904          */
 905         public function getDirectoryListInternal( $fullCont, $dir, array $params ) {
 906                 return new SwiftFileBackendDirList( $this, $fullCont, $dir, $params );
 907         }
 908
 909         /**
 910          * @see FileBackendStore::getFileListInternal()
 911          * @return SwiftFileBackendFileList
 912          */
 913         public function getFileListInternal( $fullCont, $dir, array $params ) {
 914                 return new SwiftFileBackendFileList( $this, $fullCont, $dir, $params );
 915         }
 916
 917         /**
 918          * Do not call this function outside of SwiftFileBackendFileList
 919          *
 920          * @param $fullCont string Resolved container name
 921          * @param $dir string Resolved storage directory with no trailing slash
 922          * @param $after string|null Storage path of file to list items after
 923          * @param $limit integer Max number of items to list
 924          * @param $params Array Includes flag for 'topOnly'
 925          * @return Array List of relative paths of dirs directly under $dir
 926          */
 927         public function getDirListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
 928                 $dirs = array();
 929                 if ( $after === INF ) {
 930                         return $dirs; // nothing more
 931                 }
 932                 wfProfileIn( __METHOD__ . '-' . $this->name );
 933
 934                 try {
 935                         $container = $this->getContainer( $fullCont );
 936                         $prefix = ( $dir == '' ) ? null : "{$dir}/";
 937                         // Non-recursive: only list dirs right under $dir
 938                         if ( !empty( $params['topOnly'] ) ) {
 939                                 $objects = $container->list_objects( $limit, $after, $prefix, null, '/' );
 940                                 foreach ( $objects as $object ) { // files and dirs
 941                                         if ( substr( $object, -1 ) === '/' ) {
 942                                                 $dirs[] = $object; // directories end in '/'
 943                                         }
 944                                 }
 945                         // Recursive: list all dirs under $dir and its subdirs
 946                         } else {
 947                                 // Get directory from last item of prior page
 948                                 $lastDir = $this->getParentDir( $after ); // must be first page
 949                                 $objects = $container->list_objects( $limit, $after, $prefix );
 950                                 foreach ( $objects as $object ) { // files
 951                                         $objectDir = $this->getParentDir( $object ); // directory of object
 952                                         if ( $objectDir !== false ) { // file has a parent dir
 953                                                 // Swift stores paths in UTF-8, using binary sorting.
 954                                                 // See function "create_container_table" in common/db.py.
 955                                                 // If a directory is not "greater" than the last one,
 956                                                 // then it was already listed by the calling iterator.
 957                                                 if ( strcmp( $objectDir, $lastDir ) > 0 ) {
 958                                                         $pDir = $objectDir;
 959                                                         do { // add dir and all its parent dirs
 960                                                                 $dirs[] = "{$pDir}/";
 961                                                                 $pDir = $this->getParentDir( $pDir );
 962                                                         } while ( $pDir !== false // sanity
 963                                                                 && strcmp( $pDir, $lastDir ) > 0 // not done already
 964                                                                 && strlen( $pDir ) > strlen( $dir ) // within $dir
 965                                                         );
 966                                                 }
 967                                                 $lastDir = $objectDir;
 968                                         }
 969                                 }
 970                         }
 971                         if ( count( $objects ) < $limit ) {
 972                                 $after = INF; // avoid a second RTT
 973                         } else {
 974                                 $after = end( $objects ); // update last item
 975                         }
 976                 } catch ( NoSuchContainerException $e ) {
 977                 } catch ( CloudFilesException $e ) { // some other exception?
 978                         $this->handleException( $e, null, __METHOD__,
 979                                 array( 'cont' => $fullCont, 'dir' => $dir ) );
 980                 }
 981
 982                 wfProfileOut( __METHOD__ . '-' . $this->name );
 983                 return $dirs;
 984         }
 985
 986         protected function getParentDir( $path ) {
 987                 return ( strpos( $path, '/' ) !== false ) ? dirname( $path ) : false;
 988         }
 989
 990         /**
 991          * Do not call this function outside of SwiftFileBackendFileList
 992          *
 993          * @param $fullCont string Resolved container name
 994          * @param $dir string Resolved storage directory with no trailing slash
 995          * @param $after string|null Storage path of file to list items after
 996          * @param $limit integer Max number of items to list
 997          * @param $params Array Includes flag for 'topOnly'
 998          * @return Array List of relative paths of files under $dir
 999          */
1000         public function getFileListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
1001                 $files = array();
1002                 if ( $after === INF ) {
1003                         return $files; // nothing more
1004                 }
1005                 wfProfileIn( __METHOD__ . '-' . $this->name );
1006
1007                 try {
1008                         $container = $this->getContainer( $fullCont );
1009                         $prefix = ( $dir == '' ) ? null : "{$dir}/";
1010                         // Non-recursive: only list files right under $dir
1011                         if ( !empty( $params['topOnly'] ) ) { // files and dirs
1012                                 $objects = $container->list_objects( $limit, $after, $prefix, null, '/' );
1013                                 foreach ( $objects as $object ) {
1014                                         if ( substr( $object, -1 ) !== '/' ) {
1015                                                 $files[] = $object; // directories end in '/'
1016                                         }
1017                                 }
1018                         // Recursive: list all files under $dir and its subdirs
1019                         } else { // files
1020                                 $objects = $container->list_objects( $limit, $after, $prefix );
1021                                 $files = $objects;
1022                         }
1023                         if ( count( $objects ) < $limit ) {
1024                                 $after = INF; // avoid a second RTT
1025                         } else {
1026                                 $after = end( $objects ); // update last item
1027                         }
1028                 } catch ( NoSuchContainerException $e ) {
1029                 } catch ( CloudFilesException $e ) { // some other exception?
1030                         $this->handleException( $e, null, __METHOD__,
1031                                 array( 'cont' => $fullCont, 'dir' => $dir ) );
1032                 }
1033
1034                 wfProfileOut( __METHOD__ . '-' . $this->name );
1035                 return $files;
1036         }
1037
1038         /**
1039          * @see FileBackendStore::doGetFileSha1base36()
1040          * @return bool
1041          */
1042         protected function doGetFileSha1base36( array $params ) {
1043                 $stat = $this->getFileStat( $params );
1044                 if ( $stat ) {
1045                         return $stat['sha1'];
1046                 } else {
1047                         return false;
1048                 }
1049         }
1050
1051         /**
1052          * @see FileBackendStore::doStreamFile()
1053          * @return Status
1054          */
1055         protected function doStreamFile( array $params ) {
1056                 $status = Status::newGood();
1057
1058                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
1059                 if ( $srcRel === null ) {
1060                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
1061                 }
1062
1063                 try {
1064                         $cont = $this->getContainer( $srcCont );
1065                 } catch ( NoSuchContainerException $e ) {
1066                         $status->fatal( 'backend-fail-stream', $params['src'] );
1067                         return $status;
1068                 } catch ( CloudFilesException $e ) { // some other exception?
1069                         $this->handleException( $e, $status, __METHOD__, $params );
1070                         return $status;
1071                 }
1072
1073                 try {
1074                         $output = fopen( 'php://output', 'wb' );
1075                         $obj = new CF_Object( $cont, $srcRel, false, false ); // skip HEAD
1076                         $obj->stream( $output, $this->headersFromParams( $params ) );
1077                 } catch ( NoSuchObjectException $e ) {
1078                         $status->fatal( 'backend-fail-stream', $params['src'] );
1079                 } catch ( CloudFilesException $e ) { // some other exception?
1080                         $this->handleException( $e, $status, __METHOD__, $params );
1081                 }
1082
1083                 return $status;
1084         }
1085
1086         /**
1087          * @see FileBackendStore::doGetLocalCopyMulti()
1088          * @return null|TempFSFile
1089          */
1090         protected function doGetLocalCopyMulti( array $params ) {
1091                 $tmpFiles = array();
1092
1093                 $ep = array_diff_key( $params, array( 'srcs' => 1 ) ); // for error logging
1094                 // Blindly create tmp files and stream to them, catching any exception if the file does
1095                 // not exist. Doing a stat here is useless causes infinite loops in addMissingMetadata().
1096                 foreach ( array_chunk( $params['srcs'], $params['concurrency'] ) as $pathBatch ) {
1097                         $cfOps = array(); // (path => CF_Async_Op)
1098
1099                         foreach ( $pathBatch as $path ) { // each path in this concurrent batch
1100                                 list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
1101                                 if ( $srcRel === null ) {
1102                                         $tmpFiles[$path] = null;
1103                                         continue;
1104                                 }
1105                                 $tmpFile = null;
1106                                 try {
1107                                         $sContObj = $this->getContainer( $srcCont );
1108                                         $obj = new CF_Object( $sContObj, $srcRel, false, false ); // skip HEAD
1109                                         // Get source file extension
1110                                         $ext = FileBackend::extensionFromPath( $path );
1111                                         // Create a new temporary file...
1112                                         $tmpFile = TempFSFile::factory( 'localcopy_', $ext );
1113                                         if ( $tmpFile ) {
1114                                                 $handle = fopen( $tmpFile->getPath(), 'wb' );
1115                                                 if ( $handle ) {
1116                                                         $headers = $this->headersFromParams( $params );
1117                                                         if ( count( $pathBatch ) > 1 ) {
1118                                                                 $cfOps[$path] = $obj->stream_async( $handle, $headers );
1119                                                                 $cfOps[$path]->_file_handle = $handle; // close this later
1120                                                         } else {
1121                                                                 $obj->stream( $handle, $headers );
1122                                                                 fclose( $handle );
1123                                                         }
1124                                                 } else {
1125                                                         $tmpFile = null;
1126                                                 }
1127                                         }
1128                                 } catch ( NoSuchContainerException $e ) {
1129                                         $tmpFile = null;
1130                                 } catch ( NoSuchObjectException $e ) {
1131                                         $tmpFile = null;
1132                                 } catch ( CloudFilesException $e ) { // some other exception?
1133                                         $tmpFile = null;
1134                                         $this->handleException( $e, null, __METHOD__, array( 'src' => $path ) + $ep );
1135                                 }
1136                                 $tmpFiles[$path] = $tmpFile;
1137                         }
1138
1139                         $batch = new CF_Async_Op_Batch( $cfOps );
1140                         $cfOps = $batch->execute();
1141                         foreach ( $cfOps as $path => $cfOp ) {
1142                                 try {
1143                                         $cfOp->getLastResponse();
1144                                 } catch ( NoSuchContainerException $e ) {
1145                                         $tmpFiles[$path] = null;
1146                                 } catch ( NoSuchObjectException $e ) {
1147                                         $tmpFiles[$path] = null;
1148                                 } catch ( CloudFilesException $e ) { // some other exception?
1149                                         $tmpFiles[$path] = null;
1150                                         $this->handleException( $e, null, __METHOD__, array( 'src' => $path ) + $ep );
1151                                 }
1152                                 fclose( $cfOp->_file_handle ); // close open handle
1153                         }
1154                 }
1155
1156                 return $tmpFiles;
1157         }
1158
1159         /**
1160          * @see FileBackendStore::directoriesAreVirtual()
1161          * @return bool
1162          */
1163         protected function directoriesAreVirtual() {
1164                 return true;
1165         }
1166
1167         /**
1168          * Get headers to send to Swift when reading a file based
1169          * on a FileBackend params array, e.g. that of getLocalCopy().
1170          * $params is currently only checked for a 'latest' flag.
1171          *
1172          * @param $params Array
1173          * @return Array
1174          */
1175         protected function headersFromParams( array $params ) {
1176                 $hdrs = array();
1177                 if ( !empty( $params['latest'] ) ) {
1178                         $hdrs[] = 'X-Newest: true';
1179                 }
1180                 return $hdrs;
1181         }
1182
1183         /**
1184          * @see FileBackendStore::doExecuteOpHandlesInternal()
1185          * @return Array List of corresponding Status objects
1186          */
1187         protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
1188                 $statuses = array();
1189
1190                 $cfOps = array(); // list of CF_Async_Op objects
1191                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
1192                         $cfOps[$index] = $fileOpHandle->cfOp;
1193                 }
1194                 $batch = new CF_Async_Op_Batch( $cfOps );
1195
1196                 $cfOps = $batch->execute();
1197                 foreach ( $cfOps as $index => $cfOp ) {
1198                         $status = Status::newGood();
1199                         try { // catch exceptions; update status
1200                                 $function = '_getResponse' . $fileOpHandles[$index]->call;
1201                                 $this->$function( $cfOp, $status, $fileOpHandles[$index]->params );
1202                                 $this->purgeCDNCache( $fileOpHandles[$index]->affectedObjects );
1203                         } catch ( CloudFilesException $e ) { // some other exception?
1204                                 $this->handleException( $e, $status,
1205                                         __CLASS__ . ":$function", $fileOpHandles[$index]->params );
1206                         }
1207                         $statuses[$index] = $status;
1208                 }
1209
1210                 return $statuses;
1211         }
1212
1213         /**
1214          * Set read/write permissions for a Swift container.
1215          *
1216          * $readGrps is a list of the possible criteria for a request to have
1217          * access to read a container. Each item is one of the following formats:
1218          *   - account:user       : Grants access if the request is by the given user
1219          *   - .r:<regex>         : Grants access if the request is from a referrer host that
1220          *                          matches the expression and the request is not for a listing.
1221          *                          Setting this to '*' effectively makes a container public.
1222          *   - .rlistings:<regex> : Grants access if the request is from a referrer host that
1223          *                          matches the expression and the request for a listing.
1224          *
1225          * $writeGrps is a list of the possible criteria for a request to have
1226          * access to write to a container. Each item is of the following format:
1227          *   - account:user       : Grants access if the request is by the given user
1228          *
1229          * @see http://swift.openstack.org/misc.html#acls
1230          *
1231          * In general, we don't allow listings to end-users. It's not useful, isn't well-defined
1232          * (lists are truncated to 10000 item with no way to page), and is just a performance risk.
1233          *
1234          * @param $contObj CF_Container Swift container
1235          * @param $readGrps Array List of read access routes
1236          * @param $writeGrps Array List of write access routes
1237          * @return Status
1238          */
1239         protected function setContainerAccess(
1240                 CF_Container $contObj, array $readGrps, array $writeGrps
1241         ) {
1242                 $creds = $contObj->cfs_auth->export_credentials();
1243
1244                 $url = $creds['storage_url'] . '/' . rawurlencode( $contObj->name );
1245
1246                 // Note: 10 second timeout consistent with php-cloudfiles
1247                 $req = MWHttpRequest::factory( $url, array( 'method' => 'POST', 'timeout' => 10 ) );
1248                 $req->setHeader( 'X-Auth-Token', $creds['auth_token'] );
1249                 $req->setHeader( 'X-Container-Read', implode( ',', $readGrps ) );
1250                 $req->setHeader( 'X-Container-Write', implode( ',', $writeGrps ) );
1251
1252                 return $req->execute(); // should return 204
1253         }
1254
1255         /**
1256          * Purge the CDN cache of affected objects if CDN caching is enabled.
1257          * This is for Rackspace/Akamai CDNs.
1258          *
1259          * @param $objects Array List of CF_Object items
1260          * @return void
1261          */
1262         public function purgeCDNCache( array $objects ) {
1263                 if ( $this->swiftUseCDN && $this->swiftCDNPurgable ) {
1264                         foreach ( $objects as $object ) {
1265                                 try {
1266                                         $object->purge_from_cdn();
1267                                 } catch ( CDNNotEnabledException $e ) {
1268                                         // CDN not enabled; nothing to see here
1269                                 } catch ( CloudFilesException $e ) {
1270                                         $this->handleException( $e, null, __METHOD__,
1271                                                 array( 'cont' => $object->container->name, 'obj' => $object->name ) );
1272                                 }
1273                         }
1274                 }
1275         }
1276
1277         /**
1278          * Get an authenticated connection handle to the Swift proxy
1279          *
1280          * @return CF_Connection|bool False on failure
1281          * @throws CloudFilesException
1282          */
1283         protected function getConnection() {
1284                 if ( $this->connException instanceof CloudFilesException ) {
1285                         if ( ( time() - $this->connErrorTime ) < 60 ) {
1286                                 throw $this->connException; // failed last attempt; don't bother
1287                         } else { // actually retry this time
1288                                 $this->connException = null;
1289                                 $this->connErrorTime = 0;
1290                         }
1291                 }
1292                 // Session keys expire after a while, so we renew them periodically
1293                 $reAuth = ( ( time() - $this->sessionStarted ) > $this->authTTL );
1294                 // Authenticate with proxy and get a session key...
1295                 if ( !$this->conn || $reAuth ) {
1296                         $this->sessionStarted = 0;
1297                         $this->connContainerCache->clear();
1298                         $cacheKey = $this->getCredsCacheKey( $this->auth->username );
1299                         $creds = $this->srvCache->get( $cacheKey ); // credentials
1300                         if ( is_array( $creds ) ) { // cache hit
1301                                 $this->auth->load_cached_credentials(
1302                                         $creds['auth_token'], $creds['storage_url'], $creds['cdnm_url'] );
1303                                 $this->sessionStarted = time() - ceil( $this->authTTL/2 ); // skew for worst case
1304                         } else { // cache miss
1305                                 try {
1306                                         $this->auth->authenticate();
1307                                         $creds = $this->auth->export_credentials();
1308                                         $this->srvCache->add( $cacheKey, $creds, ceil( $this->authTTL/2 ) ); // cache
1309                                         $this->sessionStarted = time();
1310                                 } catch ( CloudFilesException $e ) {
1311                                         $this->connException = $e; // don't keep re-trying
1312                                         $this->connErrorTime = time();
1313                                         throw $e; // throw it back
1314                                 }
1315                         }
1316                         if ( $this->conn ) { // re-authorizing?
1317                                 $this->conn->close(); // close active cURL handles in CF_Http object
1318                         }
1319                         $this->conn = new CF_Connection( $this->auth );
1320                 }
1321                 return $this->conn;
1322         }
1323
1324         /**
1325          * Close the connection to the Swift proxy
1326          *
1327          * @return void
1328          */
1329         protected function closeConnection() {
1330                 if ( $this->conn ) {
1331                         $this->conn->close(); // close active cURL handles in CF_Http object
1332                         $this->sessionStarted = 0;
1333                         $this->connContainerCache->clear();
1334                 }
1335         }
1336
1337         /**
1338          * Get the cache key for a container
1339          *
1340          * @param $username string
1341          * @return string
1342          */
1343         private function getCredsCacheKey( $username ) {
1344                 return wfMemcKey( 'backend', $this->getName(), 'usercreds', $username );
1345         }
1346
1347         /**
1348          * @see FileBackendStore::doClearCache()
1349          */
1350         protected function doClearCache( array $paths = null ) {
1351                 $this->connContainerCache->clear(); // clear container object cache
1352         }
1353
1354         /**
1355          * Get a Swift container object, possibly from process cache.
1356          * Use $reCache if the file count or byte count is needed.
1357          *
1358          * @param $container string Container name
1359          * @param $bypassCache bool Bypass all caches and load from Swift
1360          * @return CF_Container
1361          * @throws CloudFilesException
1362          */
1363         protected function getContainer( $container, $bypassCache = false ) {
1364                 $conn = $this->getConnection(); // Swift proxy connection
1365                 if ( $bypassCache ) { // purge cache
1366                         $this->connContainerCache->clear( $container );
1367                 } elseif ( !$this->connContainerCache->has( $container, 'obj' ) ) {
1368                         $this->primeContainerCache( array( $container ) ); // check persistent cache
1369                 }
1370                 if ( !$this->connContainerCache->has( $container, 'obj' ) ) {
1371                         $contObj = $conn->get_container( $container );
1372                         // NoSuchContainerException not thrown: container must exist
1373                         $this->connContainerCache->set( $container, 'obj', $contObj ); // cache it
1374                         if ( !$bypassCache ) {
1375                                 $this->setContainerCache( $container, // update persistent cache
1376                                         array( 'bytes' => $contObj->bytes_used, 'count' => $contObj->object_count )
1377                                 );
1378                         }
1379                 }
1380                 return $this->connContainerCache->get( $container, 'obj' );
1381         }
1382
1383         /**
1384          * Create a Swift container
1385          *
1386          * @param $container string Container name
1387          * @return CF_Container
1388          * @throws CloudFilesException
1389          */
1390         protected function createContainer( $container ) {
1391                 $conn = $this->getConnection(); // Swift proxy connection
1392                 $contObj = $conn->create_container( $container );
1393                 $this->connContainerCache->set( $container, 'obj', $contObj ); // cache
1394                 return $contObj;
1395         }
1396
1397         /**
1398          * Delete a Swift container
1399          *
1400          * @param $container string Container name
1401          * @return void
1402          * @throws CloudFilesException
1403          */
1404         protected function deleteContainer( $container ) {
1405                 $conn = $this->getConnection(); // Swift proxy connection
1406                 $this->connContainerCache->clear( $container ); // purge
1407                 $conn->delete_container( $container );
1408         }
1409
1410         /**
1411          * @see FileBackendStore::doPrimeContainerCache()
1412          * @return void
1413          */
1414         protected function doPrimeContainerCache( array $containerInfo ) {
1415                 try {
1416                         $conn = $this->getConnection(); // Swift proxy connection
1417                         foreach ( $containerInfo as $container => $info ) {
1418                                 $contObj = new CF_Container( $conn->cfs_auth, $conn->cfs_http,
1419                                         $container, $info['count'], $info['bytes'] );
1420                                 $this->connContainerCache->set( $container, 'obj', $contObj );
1421                         }
1422                 } catch ( CloudFilesException $e ) { // some other exception?
1423                         $this->handleException( $e, null, __METHOD__, array() );
1424                 }
1425         }
1426
1427         /**
1428          * Log an unexpected exception for this backend.
1429          * This also sets the Status object to have a fatal error.
1430          *
1431          * @param $e Exception
1432          * @param $status Status|null
1433          * @param $func string
1434          * @param $params Array
1435          * @return void
1436          */
1437         protected function handleException( Exception $e, $status, $func, array $params ) {
1438                 if ( $status instanceof Status ) {
1439                         if ( $e instanceof AuthenticationException ) {
1440                                 $status->fatal( 'backend-fail-connect', $this->name );
1441                         } else {
1442                                 $status->fatal( 'backend-fail-internal', $this->name );
1443                         }
1444                 }
1445                 if ( $e->getMessage() ) {
1446                         trigger_error( "$func: " . $e->getMessage(), E_USER_WARNING );
1447                 }
1448                 if ( $e instanceof InvalidResponseException ) { // possibly a stale token
1449                         $this->srvCache->delete( $this->getCredsCacheKey( $this->auth->username ) );
1450                         $this->closeConnection(); // force a re-connect and re-auth next time
1451                 }
1452                 wfDebugLog( 'SwiftBackend',
1453                         get_class( $e ) . " in '{$func}' (given '" . FormatJson::encode( $params ) . "')" .
1454                         ( $e->getMessage() ? ": {$e->getMessage()}" : "" )
1455                 );
1456         }
1457 }
1458
1459 /**
1460  * @see FileBackendStoreOpHandle
1461  */
1462 class SwiftFileOpHandle extends FileBackendStoreOpHandle {
1463         /** @var CF_Async_Op */
1464         public $cfOp;
1465         /** @var Array */
1466         public $affectedObjects = array();
1467
1468         public function __construct( $backend, array $params, $call, CF_Async_Op $cfOp ) {
1469                 $this->backend = $backend;
1470                 $this->params = $params;
1471                 $this->call = $call;
1472                 $this->cfOp = $cfOp;
1473         }
1474 }
1475
1476 /**
1477  * SwiftFileBackend helper class to page through listings.
1478  * Swift also has a listing limit of 10,000 objects for sanity.
1479  * Do not use this class from places outside SwiftFileBackend.
1480  *
1481  * @ingroup FileBackend
1482  */
1483 abstract class SwiftFileBackendList implements Iterator {
1484         /** @var Array */
1485         protected $bufferIter = array();
1486         protected $bufferAfter = null; // string; list items *after* this path
1487         protected $pos = 0; // integer
1488         /** @var Array */
1489         protected $params = array();
1490
1491         /** @var SwiftFileBackend */
1492         protected $backend;
1493         protected $container; // string; container name
1494         protected $dir; // string; storage directory
1495         protected $suffixStart; // integer
1496
1497         const PAGE_SIZE = 9000; // file listing buffer size
1498
1499         /**
1500          * @param $backend SwiftFileBackend
1501          * @param $fullCont string Resolved container name
1502          * @param $dir string Resolved directory relative to container
1503          * @param $params Array
1504          */
1505         public function __construct( SwiftFileBackend $backend, $fullCont, $dir, array $params ) {
1506                 $this->backend = $backend;
1507                 $this->container = $fullCont;
1508                 $this->dir = $dir;
1509                 if ( substr( $this->dir, -1 ) === '/' ) {
1510                         $this->dir = substr( $this->dir, 0, -1 ); // remove trailing slash
1511                 }
1512                 if ( $this->dir == '' ) { // whole container
1513                         $this->suffixStart = 0;
1514                 } else { // dir within container
1515                         $this->suffixStart = strlen( $this->dir ) + 1; // size of "path/to/dir/"
1516                 }
1517                 $this->params = $params;
1518         }
1519
1520         /**
1521          * @see Iterator::key()
1522          * @return integer
1523          */
1524         public function key() {
1525                 return $this->pos;
1526         }
1527
1528         /**
1529          * @see Iterator::next()
1530          * @return void
1531          */
1532         public function next() {
1533                 // Advance to the next file in the page
1534                 next( $this->bufferIter );
1535                 ++$this->pos;
1536                 // Check if there are no files left in this page and
1537                 // advance to the next page if this page was not empty.
1538                 if ( !$this->valid() && count( $this->bufferIter ) ) {
1539                         $this->bufferIter = $this->pageFromList(
1540                                 $this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
1541                         ); // updates $this->bufferAfter
1542                 }
1543         }
1544
1545         /**
1546          * @see Iterator::rewind()
1547          * @return void
1548          */
1549         public function rewind() {
1550                 $this->pos = 0;
1551                 $this->bufferAfter = null;
1552                 $this->bufferIter = $this->pageFromList(
1553                         $this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
1554                 ); // updates $this->bufferAfter
1555         }
1556
1557         /**
1558          * @see Iterator::valid()
1559          * @return bool
1560          */
1561         public function valid() {
1562                 if ( $this->bufferIter === null ) {
1563                         return false; // some failure?
1564                 } else {
1565                         return ( current( $this->bufferIter ) !== false ); // no paths can have this value
1566                 }
1567         }
1568
1569         /**
1570          * Get the given list portion (page)
1571          *
1572          * @param $container string Resolved container name
1573          * @param $dir string Resolved path relative to container
1574          * @param $after string|null
1575          * @param $limit integer
1576          * @param $params Array
1577          * @return Traversable|Array|null Returns null on failure
1578          */
1579         abstract protected function pageFromList( $container, $dir, &$after, $limit, array $params );
1580 }
1581
1582 /**
1583  * Iterator for listing directories
1584  */
1585 class SwiftFileBackendDirList extends SwiftFileBackendList {
1586         /**
1587          * @see Iterator::current()
1588          * @return string|bool String (relative path) or false
1589          */
1590         public function current() {
1591                 return substr( current( $this->bufferIter ), $this->suffixStart, -1 );
1592         }
1593
1594         /**
1595          * @see SwiftFileBackendList::pageFromList()
1596          * @return Array|null
1597          */
1598         protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
1599                 return $this->backend->getDirListPageInternal( $container, $dir, $after, $limit, $params );
1600         }
1601 }
1602
1603 /**
1604  * Iterator for listing regular files
1605  */
1606 class SwiftFileBackendFileList extends SwiftFileBackendList {
1607         /**
1608          * @see Iterator::current()
1609          * @return string|bool String (relative path) or false
1610          */
1611         public function current() {
1612                 return substr( current( $this->bufferIter ), $this->suffixStart );
1613         }
1614
1615         /**
1616          * @see SwiftFileBackendList::pageFromList()
1617          * @return Array|null
1618          */
1619         protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
1620                 return $this->backend->getFileListPageInternal( $container, $dir, $after, $limit, $params );
1621         }
1622 }