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1
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
24namespace Wikimedia\FileBackend\FileOps;
25
26use StatusValue;
27use Wikimedia\FileBackend\FileBackend;
28
29/**
30 * Change metadata for a file at the given storage path in the backend.
31 * Parameters for this operation are outlined in FileBackend::doOperations().
32 */
33class DescribeFileOp extends FileOp {
34    protected function allowedParams() {
35        return [ [ 'src' ], [ 'headers' ], [ 'src' ] ];
36    }
37
38    protected function doPrecheck(
39        FileStatePredicates $opPredicates,
40        FileStatePredicates $batchPredicates
41    ) {
42        $status = StatusValue::newGood();
43
44        // Check source file existence
45        $srcExists = $this->resolveFileExistence( $this->params['src'], $opPredicates );
46        if ( $srcExists === false ) {
47            $status->fatal( 'backend-fail-notexists', $this->params['src'] );
48
49            return $status;
50        } elseif ( $srcExists === FileBackend::EXISTENCE_ERROR ) {
51            $status->fatal( 'backend-fail-stat', $this->params['src'] );
52
53            return $status;
54        }
55
56        // Update file existence predicates since the operation is expected to be allowed to run
57        $srcSize = function () use ( $opPredicates ) {
58            static $size = null;
59            $size ??= $this->resolveFileSize( $this->params['src'], $opPredicates );
60            return $size;
61        };
62        $srcSha1 = function () use ( $opPredicates ) {
63            static $sha1 = null;
64            $sha1 ??= $this->resolveFileSha1Base36( $this->params['src'], $opPredicates );
65            return $sha1;
66        };
67        $batchPredicates->assumeFileExists( $this->params['src'], $srcSize, $srcSha1 );
68
69        return $status; // safe to call attempt()
70    }
71
72    protected function doAttempt() {
73        // Update the source file's metadata
74        return $this->backend->describeInternal( $this->setFlags( $this->params ) );
75    }
76
77    public function storagePathsChanged() {
78        return [ $this->params['src'] ];
79    }
80}
81
82/** @deprecated class alias since 1.43 */
83class_alias( DescribeFileOp::class, 'DescribeFileOp' );