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DescribeFileOp
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1
1<?php
2/**
3 * Helper class for representing operations with transaction support.
4 *
5 * @license GPL-2.0-or-later
6 * @file
7 * @ingroup FileBackend
8 */
9
10namespace Wikimedia\FileBackend\FileOps;
11
12use StatusValue;
13use Wikimedia\FileBackend\FileBackend;
14
15/**
16 * Change metadata for a file at the given storage path in the backend.
17 * Parameters for this operation are outlined in FileBackend::doOperations().
18 */
19class DescribeFileOp extends FileOp {
20    /** @inheritDoc */
21    protected function allowedParams() {
22        return [ [ 'src' ], [ 'headers' ], [ 'src' ] ];
23    }
24
25    /** @inheritDoc */
26    protected function doPrecheck(
27        FileStatePredicates $opPredicates,
28        FileStatePredicates $batchPredicates
29    ) {
30        $status = StatusValue::newGood();
31
32        if ( !$this->backend->isPathUsableInternal( $this->params['src'] ) ) {
33            $status->fatal( 'backend-fail-usable', $this->params['src'] );
34
35            return $status;
36        }
37
38        // Check source file existence
39        $srcExists = $this->resolveFileExistence( $this->params['src'], $opPredicates );
40        if ( $srcExists === false ) {
41            $status->fatal( 'backend-fail-notexists', $this->params['src'] );
42
43            return $status;
44        } elseif ( $srcExists === FileBackend::EXISTENCE_ERROR ) {
45            $status->fatal( 'backend-fail-stat', $this->params['src'] );
46
47            return $status;
48        }
49
50        // Update file existence predicates since the operation is expected to be allowed to run
51        $srcSize = function () use ( $opPredicates ) {
52            static $size = null;
53            $size ??= $this->resolveFileSize( $this->params['src'], $opPredicates );
54            return $size;
55        };
56        $srcSha1 = function () use ( $opPredicates ) {
57            static $sha1 = null;
58            $sha1 ??= $this->resolveFileSha1Base36( $this->params['src'], $opPredicates );
59            return $sha1;
60        };
61        $batchPredicates->assumeFileExists( $this->params['src'], $srcSize, $srcSha1 );
62
63        return $status; // safe to call attempt()
64    }
65
66    /** @inheritDoc */
67    protected function doAttempt() {
68        // Update the source file's metadata
69        return $this->backend->describeInternal( $this->setFlags( $this->params ) );
70    }
71
72    /** @inheritDoc */
73    public function storagePathsChanged() {
74        return [ $this->params['src'] ];
75    }
76}
77
78/** @deprecated class alias since 1.43 */
79class_alias( DescribeFileOp::class, 'DescribeFileOp' );