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| 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 | * Change metadata for a file at the given storage path in the backend. |
| 26 | * Parameters for this operation are outlined in FileBackend::doOperations(). |
| 27 | */ |
| 28 | class DescribeFileOp extends FileOp { |
| 29 | protected function allowedParams() { |
| 30 | return [ [ 'src' ], [ 'headers' ], [ 'src' ] ]; |
| 31 | } |
| 32 | |
| 33 | protected function doPrecheck( |
| 34 | FileStatePredicates $opPredicates, |
| 35 | FileStatePredicates $batchPredicates |
| 36 | ) { |
| 37 | $status = StatusValue::newGood(); |
| 38 | |
| 39 | // Check source file existence |
| 40 | $srcExists = $this->resolveFileExistence( $this->params['src'], $opPredicates ); |
| 41 | if ( $srcExists === false ) { |
| 42 | $status->fatal( 'backend-fail-notexists', $this->params['src'] ); |
| 43 | |
| 44 | return $status; |
| 45 | } elseif ( $srcExists === FileBackend::EXISTENCE_ERROR ) { |
| 46 | $status->fatal( 'backend-fail-stat', $this->params['src'] ); |
| 47 | |
| 48 | return $status; |
| 49 | } |
| 50 | |
| 51 | // Update file existence predicates since the operation is expected to be allowed to run |
| 52 | $srcSize = function () use ( $opPredicates ) { |
| 53 | static $size = null; |
| 54 | $size ??= $this->resolveFileSize( $this->params['src'], $opPredicates ); |
| 55 | return $size; |
| 56 | }; |
| 57 | $srcSha1 = function () use ( $opPredicates ) { |
| 58 | static $sha1 = null; |
| 59 | $sha1 ??= $this->resolveFileSha1Base36( $this->params['src'], $opPredicates ); |
| 60 | return $sha1; |
| 61 | }; |
| 62 | $batchPredicates->assumeFileExists( $this->params['src'], $srcSize, $srcSha1 ); |
| 63 | |
| 64 | return $status; // safe to call attempt() |
| 65 | } |
| 66 | |
| 67 | protected function doAttempt() { |
| 68 | // Update the source file's metadata |
| 69 | return $this->backend->describeInternal( $this->setFlags( $this->params ) ); |
| 70 | } |
| 71 | |
| 72 | public function storagePathsChanged() { |
| 73 | return [ $this->params['src'] ]; |
| 74 | } |
| 75 | } |