includes/filebackend/FSFileBackend.php

   1 <?php
   2 /**
   3  * File system based 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 Aaron Schulz
  23  */
  24
  25 /**
  26  * @brief Class for a file system (FS) based file backend.
  27  *
  28  * All "containers" each map to a directory under the backend's base directory.
  29  * For backwards-compatibility, some container paths can be set to custom paths.
  30  * The wiki ID will not be used in any custom paths, so this should be avoided.
  31  *
  32  * Having directories with thousands of files will diminish performance.
  33  * Sharding can be accomplished by using FileRepo-style hash paths.
  34  *
  35  * Status messages should avoid mentioning the internal FS paths.
  36  * PHP warnings are assumed to be logged rather than output.
  37  *
  38  * @ingroup FileBackend
  39  * @since 1.19
  40  */
  41 class FSFileBackend extends FileBackendStore {
  42         protected $basePath; // string; directory holding the container directories
  43         /** @var Array Map of container names to root paths */
  44         protected $containerPaths = array(); // for custom container paths
  45         protected $fileMode; // integer; file permission mode
  46         protected $fileOwner; // string; required OS username to own files
  47         protected $currentUser; // string; OS username running this script
  48
  49         protected $hadWarningErrors = array();
  50
  51         /**
  52          * @see FileBackendStore::__construct()
  53          * Additional $config params include:
  54          *   - basePath       : File system directory that holds containers.
  55          *   - containerPaths : Map of container names to custom file system directories.
  56          *                      This should only be used for backwards-compatibility.
  57          *   - fileMode       : Octal UNIX file permissions to use on files stored.
  58          */
  59         public function __construct( array $config ) {
  60                 parent::__construct( $config );
  61
  62                 // Remove any possible trailing slash from directories
  63                 if ( isset( $config['basePath'] ) ) {
  64                         $this->basePath = rtrim( $config['basePath'], '/' ); // remove trailing slash
  65                 } else {
  66                         $this->basePath = null; // none; containers must have explicit paths
  67                 }
  68
  69                 if ( isset( $config['containerPaths'] ) ) {
  70                         $this->containerPaths = (array)$config['containerPaths'];
  71                         foreach ( $this->containerPaths as &$path ) {
  72                                 $path = rtrim( $path, '/' );  // remove trailing slash
  73                         }
  74                 }
  75
  76                 $this->fileMode = isset( $config['fileMode'] ) ? $config['fileMode'] : 0644;
  77                 if ( isset( $config['fileOwner'] ) && function_exists( 'posix_getuid' ) ) {
  78                         $this->fileOwner = $config['fileOwner'];
  79                         $info = posix_getpwuid( posix_getuid() );
  80                         $this->currentUser = $info['name']; // cache this, assuming it doesn't change
  81                 }
  82         }
  83
  84         /**
  85          * @see FileBackendStore::resolveContainerPath()
  86          * @param $container string
  87          * @param $relStoragePath string
  88          * @return null|string
  89          */
  90         protected function resolveContainerPath( $container, $relStoragePath ) {
  91                 // Check that container has a root directory
  92                 if ( isset( $this->containerPaths[$container] ) || isset( $this->basePath ) ) {
  93                         // Check for sane relative paths (assume the base paths are OK)
  94                         if ( $this->isLegalRelPath( $relStoragePath ) ) {
  95                                 return $relStoragePath;
  96                         }
  97                 }
  98                 return null;
  99         }
 100
 101         /**
 102          * Sanity check a relative file system path for validity
 103          *
 104          * @param $path string Normalized relative path
 105          * @return bool
 106          */
 107         protected function isLegalRelPath( $path ) {
 108                 // Check for file names longer than 255 chars
 109                 if ( preg_match( '![^/]{256}!', $path ) ) { // ext3/NTFS
 110                         return false;
 111                 }
 112                 if ( wfIsWindows() ) { // NTFS
 113                         return !preg_match( '![:*?"<>|]!', $path );
 114                 } else {
 115                         return true;
 116                 }
 117         }
 118
 119         /**
 120          * Given the short (unresolved) and full (resolved) name of
 121          * a container, return the file system path of the container.
 122          *
 123          * @param $shortCont string
 124          * @param $fullCont string
 125          * @return string|null
 126          */
 127         protected function containerFSRoot( $shortCont, $fullCont ) {
 128                 if ( isset( $this->containerPaths[$shortCont] ) ) {
 129                         return $this->containerPaths[$shortCont];
 130                 } elseif ( isset( $this->basePath ) ) {
 131                         return "{$this->basePath}/{$fullCont}";
 132                 }
 133                 return null; // no container base path defined
 134         }
 135
 136         /**
 137          * Get the absolute file system path for a storage path
 138          *
 139          * @param $storagePath string Storage path
 140          * @return string|null
 141          */
 142         protected function resolveToFSPath( $storagePath ) {
 143                 list( $fullCont, $relPath ) = $this->resolveStoragePathReal( $storagePath );
 144                 if ( $relPath === null ) {
 145                         return null; // invalid
 146                 }
 147                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $storagePath );
 148                 $fsPath = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 149                 if ( $relPath != '' ) {
 150                         $fsPath .= "/{$relPath}";
 151                 }
 152                 return $fsPath;
 153         }
 154
 155         /**
 156          * @see FileBackendStore::isPathUsableInternal()
 157          * @return bool
 158          */
 159         public function isPathUsableInternal( $storagePath ) {
 160                 $fsPath = $this->resolveToFSPath( $storagePath );
 161                 if ( $fsPath === null ) {
 162                         return false; // invalid
 163                 }
 164                 $parentDir = dirname( $fsPath );
 165
 166                 if ( file_exists( $fsPath ) ) {
 167                         $ok = is_file( $fsPath ) && is_writable( $fsPath );
 168                 } else {
 169                         $ok = is_dir( $parentDir ) && is_writable( $parentDir );
 170                 }
 171
 172                 if ( $this->fileOwner !== null && $this->currentUser !== $this->fileOwner ) {
 173                         $ok = false;
 174                         trigger_error( __METHOD__ . ": PHP process owner is not '{$this->fileOwner}'." );
 175                 }
 176
 177                 return $ok;
 178         }
 179
 180         /**
 181          * @see FileBackendStore::doStoreInternal()
 182          * @return Status
 183          */
 184         protected function doStoreInternal( array $params ) {
 185                 $status = Status::newGood();
 186
 187                 $dest = $this->resolveToFSPath( $params['dst'] );
 188                 if ( $dest === null ) {
 189                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 190                         return $status;
 191                 }
 192
 193                 if ( !empty( $params['async'] ) ) { // deferred
 194                         $cmd = implode( ' ', array(
 195                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 196                                 wfEscapeShellArg( $this->cleanPathSlashes( $params['src'] ) ),
 197                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 198                         ) );
 199                         $status->value = new FSFileOpHandle( $this, $params, 'Store', $cmd, $dest );
 200                 } else { // immediate write
 201                         $ok = copy( $params['src'], $dest );
 202                         // In some cases (at least over NFS), copy() returns true when it fails
 203                         if ( !$ok || ( filesize( $params['src'] ) !== filesize( $dest ) ) ) {
 204                                 if ( $ok ) { // PHP bug
 205                                         unlink( $dest ); // remove broken file
 206                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 207                                 }
 208                                 $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 209                                 return $status;
 210                         }
 211                         $this->chmod( $dest );
 212                 }
 213
 214                 return $status;
 215         }
 216
 217         /**
 218          * @see FSFileBackend::doExecuteOpHandlesInternal()
 219          */
 220         protected function _getResponseStore( $errors, Status $status, array $params, $cmd ) {
 221                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 222                         $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 223                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 224                 }
 225         }
 226
 227         /**
 228          * @see FileBackendStore::doCopyInternal()
 229          * @return Status
 230          */
 231         protected function doCopyInternal( array $params ) {
 232                 $status = Status::newGood();
 233
 234                 $source = $this->resolveToFSPath( $params['src'] );
 235                 if ( $source === null ) {
 236                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 237                         return $status;
 238                 }
 239
 240                 $dest = $this->resolveToFSPath( $params['dst'] );
 241                 if ( $dest === null ) {
 242                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 243                         return $status;
 244                 }
 245
 246                 if ( !is_file( $source ) ) {
 247                         if ( empty( $params['ignoreMissingSource'] ) ) {
 248                                 $status->fatal( 'backend-fail-copy', $params['src'] );
 249                         }
 250                         return $status; // do nothing; either OK or bad status
 251                 }
 252
 253                 if ( !empty( $params['async'] ) ) { // deferred
 254                         $cmd = implode( ' ', array(
 255                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 256                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 257                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 258                         ) );
 259                         $status->value = new FSFileOpHandle( $this, $params, 'Copy', $cmd, $dest );
 260                 } else { // immediate write
 261                         $ok = copy( $source, $dest );
 262                         // In some cases (at least over NFS), copy() returns true when it fails
 263                         if ( !$ok || ( filesize( $source ) !== filesize( $dest ) ) ) {
 264                                 if ( $ok ) { // PHP bug
 265                                         unlink( $dest ); // remove broken file
 266                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 267                                 }
 268                                 $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 269                                 return $status;
 270                         }
 271                         $this->chmod( $dest );
 272                 }
 273
 274                 return $status;
 275         }
 276
 277         /**
 278          * @see FSFileBackend::doExecuteOpHandlesInternal()
 279          */
 280         protected function _getResponseCopy( $errors, Status $status, array $params, $cmd ) {
 281                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 282                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 283                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 284                 }
 285         }
 286
 287         /**
 288          * @see FileBackendStore::doMoveInternal()
 289          * @return Status
 290          */
 291         protected function doMoveInternal( array $params ) {
 292                 $status = Status::newGood();
 293
 294                 $source = $this->resolveToFSPath( $params['src'] );
 295                 if ( $source === null ) {
 296                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 297                         return $status;
 298                 }
 299
 300                 $dest = $this->resolveToFSPath( $params['dst'] );
 301                 if ( $dest === null ) {
 302                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 303                         return $status;
 304                 }
 305
 306                 if ( !is_file( $source ) ) {
 307                         if ( empty( $params['ignoreMissingSource'] ) ) {
 308                                 $status->fatal( 'backend-fail-move', $params['src'] );
 309                         }
 310                         return $status; // do nothing; either OK or bad status
 311                 }
 312
 313                 if ( !empty( $params['async'] ) ) { // deferred
 314                         $cmd = implode( ' ', array(
 315                                 wfIsWindows() ? 'MOVE /Y' : 'mv', // (overwrite)
 316                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 317                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 318                         ) );
 319                         $status->value = new FSFileOpHandle( $this, $params, 'Move', $cmd );
 320                 } else { // immediate write
 321                         $ok = rename( $source, $dest );
 322                         clearstatcache(); // file no longer at source
 323                         if ( !$ok ) {
 324                                 $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 325                                 return $status;
 326                         }
 327                 }
 328
 329                 return $status;
 330         }
 331
 332         /**
 333          * @see FSFileBackend::doExecuteOpHandlesInternal()
 334          */
 335         protected function _getResponseMove( $errors, Status $status, array $params, $cmd ) {
 336                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 337                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 338                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 339                 }
 340         }
 341
 342         /**
 343          * @see FileBackendStore::doDeleteInternal()
 344          * @return Status
 345          */
 346         protected function doDeleteInternal( array $params ) {
 347                 $status = Status::newGood();
 348
 349                 $source = $this->resolveToFSPath( $params['src'] );
 350                 if ( $source === null ) {
 351                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 352                         return $status;
 353                 }
 354
 355                 if ( !is_file( $source ) ) {
 356                         if ( empty( $params['ignoreMissingSource'] ) ) {
 357                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 358                         }
 359                         return $status; // do nothing; either OK or bad status
 360                 }
 361
 362                 if ( !empty( $params['async'] ) ) { // deferred
 363                         $cmd = implode( ' ', array(
 364                                 wfIsWindows() ? 'DEL' : 'unlink',
 365                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) )
 366                         ) );
 367                         $status->value = new FSFileOpHandle( $this, $params, 'Copy', $cmd );
 368                 } else { // immediate write
 369                         $ok = unlink( $source );
 370                         if ( !$ok ) {
 371                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 372                                 return $status;
 373                         }
 374                 }
 375
 376                 return $status;
 377         }
 378
 379         /**
 380          * @see FSFileBackend::doExecuteOpHandlesInternal()
 381          */
 382         protected function _getResponseDelete( $errors, Status $status, array $params, $cmd ) {
 383                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 384                         $status->fatal( 'backend-fail-delete', $params['src'] );
 385                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 386                 }
 387         }
 388
 389         /**
 390          * @see FileBackendStore::doCreateInternal()
 391          * @return Status
 392          */
 393         protected function doCreateInternal( array $params ) {
 394                 $status = Status::newGood();
 395
 396                 $dest = $this->resolveToFSPath( $params['dst'] );
 397                 if ( $dest === null ) {
 398                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 399                         return $status;
 400                 }
 401
 402                 if ( !empty( $params['async'] ) ) { // deferred
 403                         $tempFile = TempFSFile::factory( 'create_', 'tmp' );
 404                         if ( !$tempFile ) {
 405                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 406                                 return $status;
 407                         }
 408                         $bytes = file_put_contents( $tempFile->getPath(), $params['content'] );
 409                         if ( $bytes === false ) {
 410                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 411                                 return $status;
 412                         }
 413                         $cmd = implode( ' ', array(
 414                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 415                                 wfEscapeShellArg( $this->cleanPathSlashes( $tempFile->getPath() ) ),
 416                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 417                         ) );
 418                         $status->value = new FSFileOpHandle( $this, $params, 'Create', $cmd, $dest );
 419                         $tempFile->bind( $status->value );
 420                 } else { // immediate write
 421                         $bytes = file_put_contents( $dest, $params['content'] );
 422                         if ( $bytes === false ) {
 423                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 424                                 return $status;
 425                         }
 426                         $this->chmod( $dest );
 427                 }
 428
 429                 return $status;
 430         }
 431
 432         /**
 433          * @see FSFileBackend::doExecuteOpHandlesInternal()
 434          */
 435         protected function _getResponseCreate( $errors, Status $status, array $params, $cmd ) {
 436                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 437                         $status->fatal( 'backend-fail-create', $params['dst'] );
 438                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 439                 }
 440         }
 441
 442         /**
 443          * @see FileBackendStore::doPrepareInternal()
 444          * @return Status
 445          */
 446         protected function doPrepareInternal( $fullCont, $dirRel, array $params ) {
 447                 $status = Status::newGood();
 448                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 449                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 450                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 451                 $existed = is_dir( $dir ); // already there?
 452                 if ( !wfMkdirParents( $dir ) ) { // make directory and its parents
 453                         $status->fatal( 'directorycreateerror', $params['dir'] ); // fails on races
 454                 } elseif ( !is_writable( $dir ) ) {
 455                         $status->fatal( 'directoryreadonlyerror', $params['dir'] );
 456                 } elseif ( !is_readable( $dir ) ) {
 457                         $status->fatal( 'directorynotreadableerror', $params['dir'] );
 458                 }
 459                 if ( is_dir( $dir ) && !$existed ) {
 460                         // Respect any 'noAccess' or 'noListing' flags...
 461                         $status->merge( $this->doSecureInternal( $fullCont, $dirRel, $params ) );
 462                 }
 463                 return $status;
 464         }
 465
 466         /**
 467          * @see FileBackendStore::doSecureInternal()
 468          * @return Status
 469          */
 470         protected function doSecureInternal( $fullCont, $dirRel, array $params ) {
 471                 $status = Status::newGood();
 472                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 473                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 474                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 475                 // Seed new directories with a blank index.html, to prevent crawling...
 476                 if ( !empty( $params['noListing'] ) && !file_exists( "{$dir}/index.html" ) ) {
 477                         $bytes = file_put_contents( "{$dir}/index.html", $this->indexHtmlPrivate() );
 478                         if ( $bytes === false ) {
 479                                 $status->fatal( 'backend-fail-create', $params['dir'] . '/index.html' );
 480                                 return $status;
 481                         }
 482                 }
 483                 // Add a .htaccess file to the root of the container...
 484                 if ( !empty( $params['noAccess'] ) && !file_exists( "{$contRoot}/.htaccess" ) ) {
 485                         $bytes = file_put_contents( "{$contRoot}/.htaccess", $this->htaccessPrivate() );
 486                         if ( $bytes === false ) {
 487                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 488                                 $status->fatal( 'backend-fail-create', "{$storeDir}/.htaccess" );
 489                                 return $status;
 490                         }
 491                 }
 492                 return $status;
 493         }
 494
 495         /**
 496          * @see FileBackendStore::doPublishInternal()
 497          * @return Status
 498          */
 499         protected function doPublishInternal( $fullCont, $dirRel, array $params ) {
 500                 $status = Status::newGood();
 501                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 502                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 503                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 504                 // Unseed new directories with a blank index.html, to allow crawling...
 505                 if ( !empty( $params['listing'] ) && is_file( "{$dir}/index.html" ) ) {
 506                         $exists = ( file_get_contents( "{$dir}/index.html" ) === $this->indexHtmlPrivate() );
 507                         if ( $exists && !unlink( "{$dir}/index.html" ) ) { // reverse secure()
 508                                 $status->fatal( 'backend-fail-delete', $params['dir'] . '/index.html' );
 509                                 return $status;
 510                         }
 511                 }
 512                 // Remove the .htaccess file from the root of the container...
 513                 if ( !empty( $params['access'] ) && is_file( "{$contRoot}/.htaccess" ) ) {
 514                         $exists = ( file_get_contents( "{$contRoot}/.htaccess" ) === $this->htaccessPrivate() );
 515                         if ( $exists && !unlink( "{$contRoot}/.htaccess" ) ) { // reverse secure()
 516                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 517                                 $status->fatal( 'backend-fail-delete', "{$storeDir}/.htaccess" );
 518                                 return $status;
 519                         }
 520                 }
 521                 return $status;
 522         }
 523
 524         /**
 525          * @see FileBackendStore::doCleanInternal()
 526          * @return Status
 527          */
 528         protected function doCleanInternal( $fullCont, $dirRel, array $params ) {
 529                 $status = Status::newGood();
 530                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 531                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 532                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 533                 wfSuppressWarnings();
 534                 if ( is_dir( $dir ) ) {
 535                         rmdir( $dir ); // remove directory if empty
 536                 }
 537                 wfRestoreWarnings();
 538                 return $status;
 539         }
 540
 541         /**
 542          * @see FileBackendStore::doFileExists()
 543          * @return array|bool|null
 544          */
 545         protected function doGetFileStat( array $params ) {
 546                 $source = $this->resolveToFSPath( $params['src'] );
 547                 if ( $source === null ) {
 548                         return false; // invalid storage path
 549                 }
 550
 551                 $this->trapWarnings(); // don't trust 'false' if there were errors
 552                 $stat = is_file( $source ) ? stat( $source ) : false; // regular files only
 553                 $hadError = $this->untrapWarnings();
 554
 555                 if ( $stat ) {
 556                         return array(
 557                                 'mtime' => wfTimestamp( TS_MW, $stat['mtime'] ),
 558                                 'size'  => $stat['size']
 559                         );
 560                 } elseif ( !$hadError ) {
 561                         return false; // file does not exist
 562                 } else {
 563                         return null; // failure
 564                 }
 565         }
 566
 567         /**
 568          * @see FileBackendStore::doClearCache()
 569          */
 570         protected function doClearCache( array $paths = null ) {
 571                 clearstatcache(); // clear the PHP file stat cache
 572         }
 573
 574         /**
 575          * @see FileBackendStore::doDirectoryExists()
 576          * @return bool|null
 577          */
 578         protected function doDirectoryExists( $fullCont, $dirRel, array $params ) {
 579                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 580                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 581                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 582
 583                 $this->trapWarnings(); // don't trust 'false' if there were errors
 584                 $exists = is_dir( $dir );
 585                 $hadError = $this->untrapWarnings();
 586
 587                 return $hadError ? null : $exists;
 588         }
 589
 590         /**
 591          * @see FileBackendStore::getDirectoryListInternal()
 592          * @return Array|null
 593          */
 594         public function getDirectoryListInternal( $fullCont, $dirRel, array $params ) {
 595                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 596                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 597                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 598                 $exists = is_dir( $dir );
 599                 if ( !$exists ) {
 600                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 601                         return array(); // nothing under this dir
 602                 } elseif ( !is_readable( $dir ) ) {
 603                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 604                         return null; // bad permissions?
 605                 }
 606                 return new FSFileBackendDirList( $dir, $params );
 607         }
 608
 609         /**
 610          * @see FileBackendStore::getFileListInternal()
 611          * @return Array|FSFileBackendFileList|null
 612          */
 613         public function getFileListInternal( $fullCont, $dirRel, array $params ) {
 614                 list( $b, $shortCont, $r ) = FileBackend::splitStoragePath( $params['dir'] );
 615                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 616                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 617                 $exists = is_dir( $dir );
 618                 if ( !$exists ) {
 619                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 620                         return array(); // nothing under this dir
 621                 } elseif ( !is_readable( $dir ) ) {
 622                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 623                         return null; // bad permissions?
 624                 }
 625                 return new FSFileBackendFileList( $dir, $params );
 626         }
 627
 628         /**
 629          * @see FileBackendStore::doGetLocalReferenceMulti()
 630          * @return Array
 631          */
 632         protected function doGetLocalReferenceMulti( array $params ) {
 633                 $fsFiles = array(); // (path => FSFile)
 634
 635                 foreach ( $params['srcs'] as $src ) {
 636                         $source = $this->resolveToFSPath( $src );
 637                         if ( $source === null || !is_file( $source ) ) {
 638                                 $fsFiles[$src] = null; // invalid path or file does not exist
 639                         } else {
 640                                 $fsFiles[$src] = new FSFile( $source );
 641                         }
 642                 }
 643
 644                 return $fsFiles;
 645         }
 646
 647         /**
 648          * @see FileBackendStore::doGetLocalCopyMulti()
 649          * @return Array
 650          */
 651         protected function doGetLocalCopyMulti( array $params ) {
 652                 $tmpFiles = array(); // (path => TempFSFile)
 653
 654                 foreach ( $params['srcs'] as $src ) {
 655                         $source = $this->resolveToFSPath( $src );
 656                         if ( $source === null ) {
 657                                 $tmpFiles[$src] = null; // invalid path
 658                         } else {
 659                                 // Create a new temporary file with the same extension...
 660                                 $ext = FileBackend::extensionFromPath( $src );
 661                                 $tmpFile = TempFSFile::factory( 'localcopy_', $ext );
 662                                 if ( !$tmpFile ) {
 663                                         $tmpFiles[$src] = null;
 664                                 } else {
 665                                         $tmpPath = $tmpFile->getPath();
 666                                         // Copy the source file over the temp file
 667                                         wfSuppressWarnings();
 668                                         $ok = copy( $source, $tmpPath );
 669                                         wfRestoreWarnings();
 670                                         if ( !$ok ) {
 671                                                 $tmpFiles[$src] = null;
 672                                         } else {
 673                                                 $this->chmod( $tmpPath );
 674                                                 $tmpFiles[$src] = $tmpFile;
 675                                         }
 676                                 }
 677                         }
 678                 }
 679
 680                 return $tmpFiles;
 681         }
 682
 683         /**
 684          * @see FileBackendStore::directoriesAreVirtual()
 685          * @return bool
 686          */
 687         protected function directoriesAreVirtual() {
 688                 return false;
 689         }
 690
 691         /**
 692          * @see FileBackendStore::doExecuteOpHandlesInternal()
 693          * @return Array List of corresponding Status objects
 694          */
 695         protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
 696                 $statuses = array();
 697
 698                 $pipes = array();
 699                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 700                         $pipes[$index] = popen( "{$fileOpHandle->cmd} 2>&1", 'r' );
 701                 }
 702
 703                 $errs = array();
 704                 foreach ( $pipes as $index => $pipe ) {
 705                         // Result will be empty on success in *NIX. On Windows,
 706                         // it may be something like "        1 file(s) [copied|moved].".
 707                         $errs[$index] = stream_get_contents( $pipe );
 708                         fclose( $pipe );
 709                 }
 710
 711                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 712                         $status = Status::newGood();
 713                         $function = '_getResponse' . $fileOpHandle->call;
 714                         $this->$function( $errs[$index], $status, $fileOpHandle->params, $fileOpHandle->cmd );
 715                         $statuses[$index] = $status;
 716                         if ( $status->isOK() && $fileOpHandle->chmodPath ) {
 717                                 $this->chmod( $fileOpHandle->chmodPath );
 718                         }
 719                 }
 720
 721                 clearstatcache(); // files changed
 722                 return $statuses;
 723         }
 724
 725         /**
 726          * Chmod a file, suppressing the warnings
 727          *
 728          * @param $path string Absolute file system path
 729          * @return bool Success
 730          */
 731         protected function chmod( $path ) {
 732                 wfSuppressWarnings();
 733                 $ok = chmod( $path, $this->fileMode );
 734                 wfRestoreWarnings();
 735
 736                 return $ok;
 737         }
 738
 739         /**
 740          * Return the text of an index.html file to hide directory listings
 741          *
 742          * @return string
 743          */
 744         protected function indexHtmlPrivate() {
 745                 return '';
 746         }
 747
 748         /**
 749          * Return the text of a .htaccess file to make a directory private
 750          *
 751          * @return string
 752          */
 753         protected function htaccessPrivate() {
 754                 return "Deny from all\n";
 755         }
 756
 757         /**
 758          * Clean up directory separators for the given OS
 759          *
 760          * @param $path string FS path
 761          * @return string
 762          */
 763         protected function cleanPathSlashes( $path ) {
 764                 return wfIsWindows() ? strtr( $path, '/', '\\' ) : $path;
 765         }
 766
 767         /**
 768          * Listen for E_WARNING errors and track whether any happen
 769          *
 770          * @return bool
 771          */
 772         protected function trapWarnings() {
 773                 $this->hadWarningErrors[] = false; // push to stack
 774                 set_error_handler( array( $this, 'handleWarning' ), E_WARNING );
 775                 return false; // invoke normal PHP error handler
 776         }
 777
 778         /**
 779          * Stop listening for E_WARNING errors and return true if any happened
 780          *
 781          * @return bool
 782          */
 783         protected function untrapWarnings() {
 784                 restore_error_handler(); // restore previous handler
 785                 return array_pop( $this->hadWarningErrors ); // pop from stack
 786         }
 787
 788         /**
 789          * @return bool
 790          */
 791         private function handleWarning() {
 792                 $this->hadWarningErrors[count( $this->hadWarningErrors ) - 1] = true;
 793                 return true; // suppress from PHP handler
 794         }
 795 }
 796
 797 /**
 798  * @see FileBackendStoreOpHandle
 799  */
 800 class FSFileOpHandle extends FileBackendStoreOpHandle {
 801         public $cmd; // string; shell command
 802         public $chmodPath; // string; file to chmod
 803
 804         /**
 805          * @param $backend
 806          * @param $params array
 807          * @param $call
 808          * @param $cmd
 809          * @param $chmodPath null
 810          */
 811         public function __construct( $backend, array $params, $call, $cmd, $chmodPath = null ) {
 812                 $this->backend = $backend;
 813                 $this->params = $params;
 814                 $this->call = $call;
 815                 $this->cmd = $cmd;
 816                 $this->chmodPath = $chmodPath;
 817         }
 818 }
 819
 820 /**
 821  * Wrapper around RecursiveDirectoryIterator/DirectoryIterator that
 822  * catches exception or does any custom behavoir that we may want.
 823  * Do not use this class from places outside FSFileBackend.
 824  *
 825  * @ingroup FileBackend
 826  */
 827 abstract class FSFileBackendList implements Iterator {
 828         /** @var Iterator */
 829         protected $iter;
 830         protected $suffixStart; // integer
 831         protected $pos = 0; // integer
 832         /** @var Array */
 833         protected $params = array();
 834
 835         /**
 836          * @param $dir string file system directory
 837          * @param $params array
 838          */
 839         public function __construct( $dir, array $params ) {
 840                 $dir = realpath( $dir ); // normalize
 841                 $this->suffixStart = strlen( $dir ) + 1; // size of "path/to/dir/"
 842                 $this->params = $params;
 843
 844                 try {
 845                         $this->iter = $this->initIterator( $dir );
 846                 } catch ( UnexpectedValueException $e ) {
 847                         $this->iter = null; // bad permissions? deleted?
 848                 }
 849         }
 850
 851         /**
 852          * Return an appropriate iterator object to wrap
 853          *
 854          * @param $dir string file system directory
 855          * @return Iterator
 856          */
 857         protected function initIterator( $dir ) {
 858                 if ( !empty( $this->params['topOnly'] ) ) { // non-recursive
 859                         # Get an iterator that will get direct sub-nodes
 860                         return new DirectoryIterator( $dir );
 861                 } else { // recursive
 862                         # Get an iterator that will return leaf nodes (non-directories)
 863                         # RecursiveDirectoryIterator extends FilesystemIterator.
 864                         # FilesystemIterator::SKIP_DOTS default is inconsistent in PHP 5.3.x.
 865                         $flags = FilesystemIterator::CURRENT_AS_SELF | FilesystemIterator::SKIP_DOTS;
 866                         return new RecursiveIteratorIterator(
 867                                 new RecursiveDirectoryIterator( $dir, $flags ),
 868                                 RecursiveIteratorIterator::CHILD_FIRST // include dirs
 869                         );
 870                 }
 871         }
 872
 873         /**
 874          * @see Iterator::key()
 875          * @return integer
 876          */
 877         public function key() {
 878                 return $this->pos;
 879         }
 880
 881         /**
 882          * @see Iterator::current()
 883          * @return string|bool String or false
 884          */
 885         public function current() {
 886                 return $this->getRelPath( $this->iter->current()->getPathname() );
 887         }
 888
 889         /**
 890          * @see Iterator::next()
 891          * @return void
 892          */
 893         public function next() {
 894                 try {
 895                         $this->iter->next();
 896                         $this->filterViaNext();
 897                 } catch ( UnexpectedValueException $e ) {
 898                         $this->iter = null;
 899                 }
 900                 ++$this->pos;
 901         }
 902
 903         /**
 904          * @see Iterator::rewind()
 905          * @return void
 906          */
 907         public function rewind() {
 908                 $this->pos = 0;
 909                 try {
 910                         $this->iter->rewind();
 911                         $this->filterViaNext();
 912                 } catch ( UnexpectedValueException $e ) {
 913                         $this->iter = null;
 914                 }
 915         }
 916
 917         /**
 918          * @see Iterator::valid()
 919          * @return bool
 920          */
 921         public function valid() {
 922                 return $this->iter && $this->iter->valid();
 923         }
 924
 925         /**
 926          * Filter out items by advancing to the next ones
 927          */
 928         protected function filterViaNext() {}
 929
 930         /**
 931          * Return only the relative path and normalize slashes to FileBackend-style.
 932          * Uses the "real path" since the suffix is based upon that.
 933          *
 934          * @param $path string
 935          * @return string
 936          */
 937         protected function getRelPath( $path ) {
 938                 return strtr( substr( realpath( $path ), $this->suffixStart ), '\\', '/' );
 939         }
 940 }
 941
 942 class FSFileBackendDirList extends FSFileBackendList {
 943         protected function filterViaNext() {
 944                 while ( $this->iter->valid() ) {
 945                         if ( $this->iter->current()->isDot() || !$this->iter->current()->isDir() ) {
 946                                 $this->iter->next(); // skip non-directories and dot files
 947                         } else {
 948                                 break;
 949                         }
 950                 }
 951         }
 952 }
 953
 954 class FSFileBackendFileList extends FSFileBackendList {
 955         protected function filterViaNext() {
 956                 while ( $this->iter->valid() ) {
 957                         if ( !$this->iter->current()->isFile() ) {
 958                                 $this->iter->next(); // skip non-files and dot files
 959                         } else {
 960                                 break;
 961                         }
 962                 }
 963         }
 964 }