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1<?php
2/**
3 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
4 *
5 * @license GPL-2.0-or-later
6 * @file
7 */
8
9namespace MediaWiki\Api;
10
11use MediaWiki\Deferred\LinksUpdate\ImageLinksTable;
12use MediaWiki\Title\Title;
13use Wikimedia\ParamValidator\ParamValidator;
14use Wikimedia\ParamValidator\TypeDef\IntegerDef;
15
16/**
17 * This query adds an "<images>" subelement to all pages with the list of
18 * images embedded into those pages.
19 *
20 * @ingroup API
21 */
22class ApiQueryImages extends ApiQueryGeneratorBase {
23
24    public function __construct( ApiQuery $query, string $moduleName ) {
25        parent::__construct( $query, $moduleName, 'im' );
26    }
27
28    public function execute() {
29        $this->run();
30    }
31
32    /** @inheritDoc */
33    public function executeGenerator( $resultPageSet ) {
34        $this->run( $resultPageSet );
35    }
36
37    /**
38     * @param ApiPageSet|null $resultPageSet
39     */
40    private function run( $resultPageSet = null ) {
41        $pages = $this->getPageSet()->getGoodPages();
42        if ( $pages === [] ) {
43            return; // nothing to do
44        }
45
46        $params = $this->extractRequestParams();
47
48        $this->addFields( [
49            'il_from',
50            'il_to'
51        ] );
52        $this->addTables( 'imagelinks' );
53        $this->addWhereFld( 'il_from', array_keys( $pages ) );
54        if ( $params['continue'] !== null ) {
55            $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'int', 'string' ] );
56            $op = $params['dir'] == 'descending' ? '<=' : '>=';
57            $this->addWhere( $this->getDB()->buildComparison( $op, [
58                'il_from' => $cont[0],
59                'il_to' => $cont[1],
60            ] ) );
61        }
62
63        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
64        // Don't order by il_from if it's constant in the WHERE clause
65        if ( count( $pages ) === 1 ) {
66            $this->addOption( 'ORDER BY', 'il_to' . $sort );
67        } else {
68            $this->addOption( 'ORDER BY', [
69                'il_from' . $sort,
70                'il_to' . $sort
71            ] );
72        }
73        $this->addOption( 'LIMIT', $params['limit'] + 1 );
74
75        if ( $params['images'] ) {
76            $images = [];
77            foreach ( $params['images'] as $img ) {
78                $title = Title::newFromText( $img );
79                if ( !$title || $title->getNamespace() !== NS_FILE ) {
80                    $this->addWarning( [ 'apiwarn-notfile', wfEscapeWikiText( $img ) ] );
81                } else {
82                    $images[] = $title->getDBkey();
83                }
84            }
85            if ( !$images ) {
86                // No titles so no results
87                return;
88            }
89            $this->addWhereFld( 'il_to', $images );
90        }
91
92        $this->setVirtualDomain( ImageLinksTable::VIRTUAL_DOMAIN );
93        $res = $this->select( __METHOD__ );
94        $this->resetVirtualDomain();
95
96        if ( $resultPageSet === null ) {
97            $count = 0;
98            foreach ( $res as $row ) {
99                if ( ++$count > $params['limit'] ) {
100                    // We've reached the one extra which shows that
101                    // there are additional pages to be had. Stop here...
102                    $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
103                    break;
104                }
105                $vals = [];
106                ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
107                $fit = $this->addPageSubItem( $row->il_from, $vals );
108                if ( !$fit ) {
109                    $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
110                    break;
111                }
112            }
113        } else {
114            $titles = [];
115            $count = 0;
116            foreach ( $res as $row ) {
117                if ( ++$count > $params['limit'] ) {
118                    // We've reached the one extra which shows that
119                    // there are additional pages to be had. Stop here...
120                    $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
121                    break;
122                }
123                $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
124            }
125            $resultPageSet->populateFromTitles( $titles );
126        }
127    }
128
129    /** @inheritDoc */
130    public function getCacheMode( $params ) {
131        return 'public';
132    }
133
134    /** @inheritDoc */
135    public function getAllowedParams() {
136        return [
137            'limit' => [
138                ParamValidator::PARAM_DEFAULT => 10,
139                ParamValidator::PARAM_TYPE => 'limit',
140                IntegerDef::PARAM_MIN => 1,
141                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
142                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
143            ],
144            'continue' => [
145                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
146            ],
147            'images' => [
148                ParamValidator::PARAM_ISMULTI => true,
149            ],
150            'dir' => [
151                ParamValidator::PARAM_DEFAULT => 'ascending',
152                ParamValidator::PARAM_TYPE => [
153                    'ascending',
154                    'descending'
155                ]
156            ],
157        ];
158    }
159
160    /** @inheritDoc */
161    protected function getExamplesMessages() {
162        $title = Title::newMainPage()->getPrefixedText();
163        $mp = rawurlencode( $title );
164
165        return [
166            "action=query&prop=images&titles={$mp}"
167                => 'apihelp-query+images-example-simple',
168            "action=query&generator=images&titles={$mp}&prop=info"
169                => 'apihelp-query+images-example-generator',
170        ];
171    }
172
173    /** @inheritDoc */
174    public function getHelpUrls() {
175        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Images';
176    }
177}
178
179/** @deprecated class alias since 1.43 */
180class_alias( ApiQueryImages::class, 'ApiQueryImages' );