1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\Status\Status;
use MediaWiki\Storage\BlobStore;
/**
* Helper for storage of metadata. Sharing the code between LocalFile and ArchivedFile
*
* @internal
* @ingroup FileAbstraction
*/
class MetadataStorageHelper {
/** @var LocalRepo */
private $repo;
public function __construct( LocalRepo $repo ) {
$this->repo = $repo;
}
/**
* Get metadata in JSON format ready for DB insertion, optionally splitting
* items out to BlobStore.
*
* @param LocalFile|ArchivedFile $file
* @param array $envelope
* @return array
*/
public function getJsonMetadata( $file, $envelope ) {
// Try encoding
$s = $this->jsonEncode( $envelope );
// Decide whether to try splitting the metadata.
// Return early if it's not going to happen.
if ( !$this->repo->isSplitMetadataEnabled()
|| !$file->getHandler()
|| !$file->getHandler()->useSplitMetadata()
) {
return [ $s, [] ];
}
$threshold = $this->repo->getSplitMetadataThreshold();
if ( !$threshold || strlen( $s ) <= $threshold ) {
return [ $s, [] ];
}
$blobStore = $this->repo->getBlobStore();
if ( !$blobStore ) {
return [ $s, [] ];
}
// The data as a whole is above the item threshold. Look for
// large items that can be split out.
$blobAddresses = [];
foreach ( $envelope['data'] as $name => $value ) {
$encoded = $this->jsonEncode( $value );
if ( strlen( $encoded ) > $threshold ) {
$blobAddresses[$name] = $blobStore->storeBlob(
$encoded,
[ BlobStore::IMAGE_HINT => $file->getName() ]
);
}
}
// Remove any items that were split out
$envelope['data'] = array_diff_key( $envelope['data'], $blobAddresses );
$envelope['blobs'] = $blobAddresses;
$s = $this->jsonEncode( $envelope );
return [ $s, $blobAddresses ];
}
/**
* Do JSON encoding with local flags. Callers must make sure that the data can be serialized.
*
* @param mixed $data
* @return string
*/
public function jsonEncode( $data ): string {
$s = json_encode( $data,
JSON_INVALID_UTF8_IGNORE |
JSON_UNESCAPED_SLASHES |
JSON_UNESCAPED_UNICODE );
if ( $s === false ) {
throw new InvalidArgumentException( __METHOD__ . ': metadata is not JSON-serializable ' );
}
return $s;
}
/**
* @param array $addresses
* @return array
*/
public function getMetadataFromBlobStore( array $addresses ): array {
$result = [];
if ( $addresses ) {
$blobStore = $this->repo->getBlobStore();
if ( !$blobStore ) {
LoggerFactory::getInstance( 'LocalFile' )->warning(
"Unable to load metadata: repo has no blob store" );
return $result;
}
$status = $blobStore->getBlobBatch( $addresses );
if ( !$status->isGood() ) {
$msg = Status::wrap( $status )->getWikiText(
false, false, 'en' );
LoggerFactory::getInstance( 'LocalFile' )->warning(
"Error loading metadata from BlobStore: $msg" );
}
foreach ( $addresses as $itemName => $address ) {
$json = $status->getValue()[$address] ?? null;
if ( $json !== null ) {
$value = $this->jsonDecode( $json );
$result[$itemName] = $value;
}
}
}
return $result;
}
/**
* Do JSON decoding with local flags.
*
* This doesn't use JsonCodec because JsonCodec can construct objects,
* which we don't want.
*
* Does not throw. Returns false on failure.
*
* @param string $s
* @return mixed The decoded value, or false on failure
*/
public function jsonDecode( string $s ) {
// phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
return @json_decode( $s, true, 512, JSON_INVALID_UTF8_IGNORE );
}
}
|
