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