includes/libs/filebackend/fileop/MoveFileOp.php

   1 <?php
   2 /**
   3  * Helper class for representing operations with transaction support.
   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  */
  23
  24 /**
  25  * Move a file from one storage path to another in the backend.
  26  * Parameters for this operation are outlined in FileBackend::doOperations().
  27  */
  28 class MoveFileOp extends FileOp {
  29         protected function allowedParams() {
  30                 return [
  31                         [ 'src', 'dst' ],
  32                         [ 'overwrite', 'overwriteSame', 'ignoreMissingSource', 'headers' ],
  33                         [ 'src', 'dst' ]
  34                 ];
  35         }
  36
  37         protected function doPrecheck( array &$predicates ) {
  38                 $status = StatusValue::newGood();
  39                 // Check if the source file exists
  40                 if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
  41                         if ( $this->getParam( 'ignoreMissingSource' ) ) {
  42                                 $this->doOperation = false; // no-op
  43                                 // Update file existence predicates (cache 404s)
  44                                 $predicates['exists'][$this->params['src']] = false;
  45                                 $predicates['sha1'][$this->params['src']] = false;
  46
  47                                 return $status; // nothing to do
  48                         } else {
  49                                 $status->fatal( 'backend-fail-notexists', $this->params['src'] );
  50
  51                                 return $status;
  52                         }
  53                         // Check if a file can be placed/changed at the destination
  54                 } elseif ( !$this->backend->isPathUsableInternal( $this->params['dst'] ) ) {
  55                         $status->fatal( 'backend-fail-usable', $this->params['dst'] );
  56                         $status->fatal( 'backend-fail-move', $this->params['src'], $this->params['dst'] );
  57
  58                         return $status;
  59                 }
  60                 // Check if destination file exists
  61                 $status->merge( $this->precheckDestExistence( $predicates ) );
  62                 $this->params['dstExists'] = $this->destExists; // see FileBackendStore::setFileCache()
  63                 if ( $status->isOK() ) {
  64                         // Update file existence predicates
  65                         $predicates['exists'][$this->params['src']] = false;
  66                         $predicates['sha1'][$this->params['src']] = false;
  67                         $predicates['exists'][$this->params['dst']] = true;
  68                         $predicates['sha1'][$this->params['dst']] = $this->sourceSha1;
  69                 }
  70
  71                 return $status; // safe to call attempt()
  72         }
  73
  74         protected function doAttempt() {
  75                 if ( $this->overwriteSameCase ) {
  76                         if ( $this->params['src'] === $this->params['dst'] ) {
  77                                 // Do nothing to the destination (which is also the source)
  78                                 $status = StatusValue::newGood();
  79                         } else {
  80                                 // Just delete the source as the destination file needs no changes
  81                                 $status = $this->backend->deleteInternal( $this->setFlags(
  82                                         [ 'src' => $this->params['src'] ]
  83                                 ) );
  84                         }
  85                 } elseif ( $this->params['src'] === $this->params['dst'] ) {
  86                         // Just update the destination file headers
  87                         $headers = $this->getParam( 'headers' ) ?: [];
  88                         $status = $this->backend->describeInternal( $this->setFlags(
  89                                 [ 'src' => $this->params['dst'], 'headers' => $headers ]
  90                         ) );
  91                 } else {
  92                         // Move the file to the destination
  93                         $status = $this->backend->moveInternal( $this->setFlags( $this->params ) );
  94                 }
  95
  96                 return $status;
  97         }
  98
  99         public function storagePathsRead() {
 100                 return [ $this->params['src'] ];
 101         }
 102
 103         public function storagePathsChanged() {
 104                 return [ $this->params['src'], $this->params['dst'] ];
 105         }
 106 }