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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
21use MediaWiki\Actions\FileDeleteAction;
22use MediaWiki\MediaWikiServices;
23use MediaWiki\Title\Title;
24use MediaWiki\Title\TitleArrayFromResult;
25use Wikimedia\Rdbms\FakeResultWrapper;
26
27/**
28 * Special handling for representing file pages.
29 *
30 * @ingroup Media
31 */
32class WikiFilePage extends WikiPage {
33    /** @var File|false */
34    protected $mFile = false;
35    /** @var LocalRepo|null */
36    protected $mRepo = null;
37    /** @var bool */
38    protected $mFileLoaded = false;
39    /** @var array|null */
40    protected $mDupes = null;
41
42    /**
43     * @param Title $title
44     */
45    public function __construct( $title ) {
46        parent::__construct( $title );
47        $this->mDupes = null;
48        $this->mRepo = null;
49    }
50
51    /**
52     * @param File $file
53     */
54    public function setFile( File $file ) {
55        $this->mFile = $file;
56        $this->mFileLoaded = true;
57    }
58
59    /**
60     * @return bool
61     */
62    protected function loadFile() {
63        $services = MediaWikiServices::getInstance();
64        if ( $this->mFileLoaded ) {
65            return true;
66        }
67
68        $this->mFile = $services->getRepoGroup()->findFile( $this->mTitle );
69        if ( !$this->mFile ) {
70            $this->mFile = $services->getRepoGroup()->getLocalRepo()
71                ->newFile( $this->mTitle );
72        }
73
74        if ( !$this->mFile instanceof File ) {
75            throw new RuntimeException( 'Expected to find file. See T250767' );
76        }
77
78        $this->mRepo = $this->mFile->getRepo();
79        $this->mFileLoaded = true;
80        return true;
81    }
82
83    /**
84     * @return bool|Title|string False, Title of in-wiki target, or string with URL
85     */
86    public function followRedirect() {
87        $this->loadFile();
88        if ( $this->mFile->isLocal() ) {
89            return parent::followRedirect();
90        }
91        $from = $this->mFile->getRedirected();
92        $to = $this->mFile->getName();
93        if ( $from === null || $from === $to ) {
94            return false;
95        }
96        return Title::makeTitle( NS_FILE, $to );
97    }
98
99    /**
100     * @return bool
101     */
102    public function isRedirect() {
103        $this->loadFile();
104        if ( $this->mFile->isLocal() ) {
105            return parent::isRedirect();
106        }
107
108        return $this->mFile->getRedirected() !== null;
109    }
110
111    /**
112     * @return bool
113     */
114    public function isLocal() {
115        $this->loadFile();
116        return $this->mFile->isLocal();
117    }
118
119    /**
120     * @return File
121     */
122    public function getFile(): File {
123        $this->loadFile();
124        return $this->mFile;
125    }
126
127    /**
128     * @return File[]|null
129     */
130    public function getDuplicates() {
131        $this->loadFile();
132        if ( $this->mDupes !== null ) {
133            return $this->mDupes;
134        }
135        $hash = $this->mFile->getSha1();
136        if ( !( $hash ) ) {
137            $this->mDupes = [];
138            return $this->mDupes;
139        }
140        $dupes = MediaWikiServices::getInstance()->getRepoGroup()->findBySha1( $hash );
141        // Remove duplicates with self and non matching file sizes
142        $self = $this->mFile->getRepoName() . ':' . $this->mFile->getName();
143        $size = $this->mFile->getSize();
144
145        /**
146         * @var File $file
147         */
148        foreach ( $dupes as $index => $file ) {
149            $key = $file->getRepoName() . ':' . $file->getName();
150            if ( $key === $self || $file->getSize() != $size ) {
151                unset( $dupes[$index] );
152            }
153        }
154        $this->mDupes = $dupes;
155        return $this->mDupes;
156    }
157
158    /**
159     * Override handling of action=purge
160     * @return bool
161     */
162    public function doPurge() {
163        $this->loadFile();
164
165        if ( $this->mFile->exists() ) {
166            wfDebug( 'ImagePage::doPurge purging ' . $this->mFile->getName() );
167            $job = HTMLCacheUpdateJob::newForBacklinks(
168                $this->mTitle,
169                'imagelinks',
170                [ 'causeAction' => 'file-purge' ]
171            );
172            MediaWikiServices::getInstance()->getJobQueueGroup()->lazyPush( $job );
173        } else {
174            wfDebug( 'ImagePage::doPurge no image for '
175                . $this->mFile->getName() . "; limiting purge to cache only" );
176        }
177
178        // even if the file supposedly doesn't exist, force any cached information
179        // to be updated (in case the cached information is wrong)
180
181        // Purge current version and its thumbnails
182        $this->mFile->purgeCache( [ 'forThumbRefresh' => true ] );
183
184        // Purge the old versions and their thumbnails
185        foreach ( $this->mFile->getHistory() as $oldFile ) {
186            $oldFile->purgeCache( [ 'forThumbRefresh' => true ] );
187        }
188
189        if ( $this->mRepo ) {
190            // Purge redirect cache
191            $this->mRepo->invalidateImageRedirect( $this->mTitle );
192        }
193
194        return parent::doPurge();
195    }
196
197    /**
198     * Get the categories this file is a member of on the wiki where it was uploaded.
199     * For local files, this is the same as getCategories().
200     * For foreign API files (InstantCommons), this is not supported currently.
201     * Results will include hidden categories.
202     *
203     * @return TitleArrayFromResult
204     * @since 1.23
205     */
206    public function getForeignCategories() {
207        $this->loadFile();
208        $title = $this->mTitle;
209        $file = $this->mFile;
210        $titleFactory = MediaWikiServices::getInstance()->getTitleFactory();
211
212        if ( !$file instanceof LocalFile ) {
213            wfDebug( __METHOD__ . " is not supported for this file" );
214            return $titleFactory->newTitleArrayFromResult( new FakeResultWrapper( [] ) );
215        }
216
217        /** @var LocalRepo $repo */
218        $repo = $file->getRepo();
219        $dbr = $repo->getReplicaDB();
220
221        $res = $dbr->newSelectQueryBuilder()
222            ->select( [ 'page_title' => 'cl_to', 'page_namespace' => (string)NS_CATEGORY ] )
223            ->from( 'page' )
224            ->join( 'categorylinks', null, 'page_id = cl_from' )
225            ->where( [ 'page_namespace' => $title->getNamespace(), 'page_title' => $title->getDBkey(), ] )
226            ->caller( __METHOD__ )->fetchResultSet();
227
228        return $titleFactory->newTitleArrayFromResult( $res );
229    }
230
231    /**
232     * @since 1.28
233     * @return string
234     */
235    public function getWikiDisplayName() {
236        return $this->getFile()->getRepo()->getDisplayName();
237    }
238
239    /**
240     * @since 1.28
241     * @return string
242     */
243    public function getSourceURL() {
244        return $this->getFile()->getDescriptionUrl();
245    }
246
247    /**
248     * @inheritDoc
249     */
250    public function getActionOverrides() {
251        $file = $this->getFile();
252        if ( $file->exists() && $file->isLocal() && !$file->getRedirected() ) {
253            // Would be an actual file deletion
254            return [ 'delete' => FileDeleteAction::class ] + parent::getActionOverrides();
255        }
256        // It should use the normal article deletion interface
257        return parent::getActionOverrides();
258    }
259}