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1<?php
2
3/**
4 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
5 *
6 * @license GPL-2.0-or-later
7 * @file
8 */
9
10namespace MediaWiki\Api;
11
12use MediaWiki\Deferred\LinksUpdate\ExternalLinksTable;
13use MediaWiki\ExternalLinks\LinkFilter;
14use MediaWiki\MainConfigNames;
15use MediaWiki\Parser\Parser;
16use MediaWiki\Title\Title;
17use MediaWiki\Utils\UrlUtils;
18use Wikimedia\ParamValidator\ParamValidator;
19use Wikimedia\ParamValidator\TypeDef\IntegerDef;
20use Wikimedia\Rdbms\IExpression;
21use Wikimedia\Rdbms\LikeValue;
22
23/**
24 * @ingroup API
25 */
26class ApiQueryExtLinksUsage extends ApiQueryGeneratorBase {
27
28    private UrlUtils $urlUtils;
29
30    public function __construct(
31        ApiQuery $query,
32        string $moduleName,
33        UrlUtils $urlUtils
34    ) {
35        parent::__construct( $query, $moduleName, 'eu' );
36
37        $this->urlUtils = $urlUtils;
38    }
39
40    public function execute() {
41        $this->run();
42    }
43
44    /** @inheritDoc */
45    public function getCacheMode( $params ) {
46        return 'public';
47    }
48
49    /** @inheritDoc */
50    public function executeGenerator( $resultPageSet ) {
51        $this->run( $resultPageSet );
52    }
53
54    /**
55     * @param ApiPageSet|null $resultPageSet
56     * @return void
57     */
58    private function run( $resultPageSet = null ) {
59        $params = $this->extractRequestParams();
60        $db = $this->getDB();
61
62        $query = $params['query'];
63        $protocol = LinkFilter::getProtocolPrefix( $params['protocol'] );
64
65        $this->addTables( [ 'externallinks', 'page' ] );
66        $this->addJoinConds( [ 'page' => [ 'JOIN', 'page_id=el_from' ] ] );
67        $fields = [ 'el_to_domain_index', 'el_to_path' ];
68
69        $miser_ns = [];
70        if ( $this->getConfig()->get( MainConfigNames::MiserMode ) ) {
71            $miser_ns = $params['namespace'] ?: [];
72        } else {
73            $this->addWhereFld( 'page_namespace', $params['namespace'] );
74        }
75        if ( $query !== null && $query !== '' ) {
76            // Normalize query to match the normalization applied for the externallinks table
77            $query = Parser::normalizeLinkUrl( $query );
78            $conds = LinkFilter::getQueryConditions( $query, [
79                'protocol' => $protocol,
80                'oneWildcard' => true,
81                'db' => $db
82            ] );
83            if ( !$conds ) {
84                $this->dieWithError( 'apierror-badquery' );
85            }
86            $this->addWhere( $conds );
87        } else {
88            if ( $protocol !== null ) {
89                $this->addWhere(
90                    $db->expr( 'el_to_domain_index', IExpression::LIKE, new LikeValue( "$protocol", $db->anyString() ) )
91                );
92            }
93        }
94        $orderBy = [ 'el_id' ];
95
96        $this->addOption( 'ORDER BY', $orderBy );
97        $this->addFields( $orderBy ); // Make sure
98
99        $prop = array_fill_keys( $params['prop'], true );
100        $fld_ids = isset( $prop['ids'] );
101        $fld_title = isset( $prop['title'] );
102        $fld_url = isset( $prop['url'] );
103
104        if ( $resultPageSet === null ) {
105            $this->addFields( [
106                'page_id',
107                'page_namespace',
108                'page_title'
109            ] );
110            foreach ( $fields as $field ) {
111                $this->addFieldsIf( $field, $fld_url );
112            }
113        } else {
114            $this->addFields( $resultPageSet->getPageTableFields() );
115        }
116
117        $limit = $params['limit'];
118        $this->addOption( 'LIMIT', $limit + 1 );
119
120        // T244254: Avoid MariaDB deciding to scan all of `page`.
121        $this->addOption( 'STRAIGHT_JOIN' );
122
123        if ( $params['continue'] !== null ) {
124            $cont = $this->parseContinueParamOrDie( $params['continue'],
125                array_fill( 0, count( $orderBy ), 'string' ) );
126            $conds = array_combine( $orderBy, array_map( 'rawurldecode', $cont ) );
127            $this->addWhere( $db->buildComparison( '>=', $conds ) );
128        }
129
130        $this->setVirtualDomain( ExternalLinksTable::VIRTUAL_DOMAIN );
131        $res = $this->select( __METHOD__ );
132        $this->resetVirtualDomain();
133
134        $result = $this->getResult();
135
136        if ( $resultPageSet === null ) {
137            $this->executeGenderCacheFromResultWrapper( $res, __METHOD__ );
138        }
139
140        $count = 0;
141        foreach ( $res as $row ) {
142            if ( ++$count > $limit ) {
143                // We've reached the one extra which shows that there are
144                // additional pages to be had. Stop here...
145                $this->setContinue( $orderBy, $row );
146                break;
147            }
148
149            if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
150                continue;
151            }
152
153            if ( $resultPageSet === null ) {
154                $vals = [
155                    ApiResult::META_TYPE => 'assoc',
156                ];
157                if ( $fld_ids ) {
158                    $vals['pageid'] = (int)$row->page_id;
159                }
160                if ( $fld_title ) {
161                    $title = Title::makeTitle( $row->page_namespace, $row->page_title );
162                    ApiQueryBase::addTitleInfo( $vals, $title );
163                }
164                if ( $fld_url ) {
165                    $to = LinkFilter::reverseIndexes( $row->el_to_domain_index ) . $row->el_to_path;
166                    // expand protocol-relative urls
167                    if ( $params['expandurl'] ) {
168                        $to = (string)$this->urlUtils->expand( $to, PROTO_CANONICAL );
169                    }
170                    $vals['url'] = $to;
171                }
172                $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
173                if ( !$fit ) {
174                    $this->setContinue( $orderBy, $row );
175                    break;
176                }
177            } else {
178                $resultPageSet->processDbRow( $row );
179            }
180        }
181
182        if ( $resultPageSet === null ) {
183            $result->addIndexedTagName( [ 'query', $this->getModuleName() ],
184                $this->getModulePrefix() );
185        }
186    }
187
188    private function setContinue( array $orderBy, \stdClass $row ) {
189        $fields = [];
190        foreach ( $orderBy as $field ) {
191            $fields[] = strtr( $row->$field, [ '%' => '%25', '|' => '%7C' ] );
192        }
193        $this->setContinueEnumParameter( 'continue', implode( '|', $fields ) );
194    }
195
196    /** @inheritDoc */
197    public function getAllowedParams() {
198        $ret = [
199            'prop' => [
200                ParamValidator::PARAM_ISMULTI => true,
201                ParamValidator::PARAM_DEFAULT => 'ids|title|url',
202                ParamValidator::PARAM_TYPE => [
203                    'ids',
204                    'title',
205                    'url'
206                ],
207                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
208            ],
209            'continue' => [
210                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
211            ],
212            'protocol' => [
213                ParamValidator::PARAM_TYPE => LinkFilter::prepareProtocols(),
214                ParamValidator::PARAM_DEFAULT => '',
215            ],
216            'query' => null,
217            'namespace' => [
218                ParamValidator::PARAM_ISMULTI => true,
219                ParamValidator::PARAM_TYPE => 'namespace'
220            ],
221            'limit' => [
222                ParamValidator::PARAM_DEFAULT => 10,
223                ParamValidator::PARAM_TYPE => 'limit',
224                IntegerDef::PARAM_MIN => 1,
225                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
226                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
227            ],
228            'expandurl' => [
229                ParamValidator::PARAM_TYPE => 'boolean',
230                ParamValidator::PARAM_DEFAULT => false,
231                ParamValidator::PARAM_DEPRECATED => true,
232            ],
233        ];
234
235        if ( $this->getConfig()->get( MainConfigNames::MiserMode ) ) {
236            $ret['namespace'][ApiBase::PARAM_HELP_MSG_APPEND] = [
237                'api-help-param-limited-in-miser-mode',
238            ];
239        }
240
241        return $ret;
242    }
243
244    /** @inheritDoc */
245    protected function getExamplesMessages() {
246        return [
247            'action=query&list=exturlusage&euquery=www.mediawiki.org'
248                => 'apihelp-query+exturlusage-example-simple',
249        ];
250    }
251
252    /** @inheritDoc */
253    public function getHelpUrls() {
254        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Exturlusage';
255    }
256}
257
258/** @deprecated class alias since 1.43 */
259class_alias( ApiQueryExtLinksUsage::class, 'ApiQueryExtLinksUsage' );