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1<?php
2/**
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
17 *
18 * @file
19 */
20
21namespace MediaWiki\Specials;
22
23use MediaWiki\MainConfigNames;
24use MediaWiki\MediaWikiServices;
25use MediaWiki\SpecialPage\ImageQueryPage;
26use Wikimedia\Rdbms\IConnectionProvider;
27
28/**
29 * List of unused images
30 *
31 * @ingroup SpecialPage
32 */
33class SpecialUnusedImages extends ImageQueryPage {
34    private int $migrationStage;
35
36    public function __construct( IConnectionProvider $dbProvider ) {
37        parent::__construct( 'Unusedimages' );
38        $this->setDatabaseProvider( $dbProvider );
39        $this->migrationStage = MediaWikiServices::getInstance()->getMainConfig()->get(
40            MainConfigNames::FileSchemaMigrationStage
41        );
42    }
43
44    public function isExpensive() {
45        return true;
46    }
47
48    protected function sortDescending() {
49        return false;
50    }
51
52    public function isSyndicated() {
53        return false;
54    }
55
56    public function getQueryInfo() {
57        if ( $this->migrationStage & SCHEMA_COMPAT_READ_OLD ) {
58            $tables = [ 'image' ];
59            $nameField = 'img_name';
60            $timestampField = 'img_timestamp';
61            $extraConds = [];
62            $extraJoins = [];
63        } else {
64            $tables = [ 'file', 'filerevision' ];
65            $nameField = 'file_name';
66            $timestampField = 'fr_timestamp';
67            $extraConds = [ 'file_deleted' => 0 ];
68            $extraJoins = [ 'filerevision' => [ 'JOIN', 'file_latest = fr_id' ] ];
69        }
70
71        $retval = [
72            'tables' => array_merge( $tables, [ 'imagelinks' ] ),
73            'fields' => [
74                'namespace' => NS_FILE,
75                'title' => $nameField,
76                'value' => $timestampField,
77            ],
78            'conds' => array_merge( [ 'il_to' => null ], $extraConds ),
79            'join_conds' => array_merge(
80                [ 'imagelinks' => [ 'LEFT JOIN', 'il_to = ' . $nameField ] ],
81                $extraJoins
82            ),
83        ];
84
85        if ( $this->getConfig()->get( MainConfigNames::CountCategorizedImagesAsUsed ) ) {
86            // Order is significant
87            $retval['tables'] = [ 'image', 'page', 'categorylinks',
88                'imagelinks' ];
89            $retval['conds']['page_namespace'] = NS_FILE;
90            $retval['conds']['cl_from'] = null;
91            $retval['conds'][] = $nameField . ' = page_title';
92            $retval['join_conds']['categorylinks'] = [
93                'LEFT JOIN', 'cl_from = page_id' ];
94            $retval['join_conds']['imagelinks'] = [
95                'LEFT JOIN', 'il_to = page_title' ];
96        }
97
98        return $retval;
99    }
100
101    public function usesTimestamps() {
102        return true;
103    }
104
105    protected function getPageHeader() {
106        if ( $this->getConfig()->get( MainConfigNames::CountCategorizedImagesAsUsed ) ) {
107            return $this->msg(
108                'unusedimagestext-categorizedimgisused'
109            )->parseAsBlock();
110        }
111        return $this->msg( 'unusedimagestext' )->parseAsBlock();
112    }
113
114    protected function getGroupName() {
115        return 'maintenance';
116    }
117}
118
119/**
120 * Retain the old class name for backwards compatibility.
121 * @deprecated since 1.41
122 */
123class_alias( SpecialUnusedImages::class, 'SpecialUnusedImages' );