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2
1<?php
2/**
3 * Copyright © 2008 Yuri Astrakhan "<Firstname><Lastname>@gmail.com",
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
19 *
20 * @file
21 */
22
23namespace MediaWiki\Api;
24
25use MediaWiki\MainConfigNames;
26use MediaWiki\Page\PageIdentity;
27use MediaWiki\Title\Title;
28use MediaWiki\Title\TitleFormatter;
29use MediaWiki\User\User;
30use MediaWiki\Watchlist\WatchlistManager;
31use Wikimedia\ParamValidator\ParamValidator;
32use Wikimedia\ParamValidator\TypeDef\ExpiryDef;
33
34/**
35 * API module to allow users to watch a page
36 *
37 * @ingroup API
38 */
39class ApiWatch extends ApiBase {
40    /** @var ApiPageSet|null */
41    private $mPageSet = null;
42
43    /** @var bool Whether watchlist expiries are enabled. */
44    private $expiryEnabled;
45
46    /** @var string Relative maximum expiry. */
47    private $maxDuration;
48
49    protected WatchlistManager $watchlistManager;
50    private TitleFormatter $titleFormatter;
51
52    public function __construct(
53        ApiMain $mainModule,
54        string $moduleName,
55        WatchlistManager $watchlistManager,
56        TitleFormatter $titleFormatter
57    ) {
58        parent::__construct( $mainModule, $moduleName );
59
60        $this->watchlistManager = $watchlistManager;
61        $this->titleFormatter = $titleFormatter;
62        $this->expiryEnabled = $this->getConfig()->get( MainConfigNames::WatchlistExpiry );
63        $this->maxDuration = $this->getConfig()->get( MainConfigNames::WatchlistExpiryMaxDuration );
64    }
65
66    public function execute() {
67        $user = $this->getUser();
68        if ( !$user->isRegistered()
69            || ( $user->isTemp() && !$user->isAllowed( 'editmywatchlist' ) )
70        ) {
71            $this->dieWithError( 'watchlistanontext', 'notloggedin' );
72        }
73
74        $this->checkUserRightsAny( 'editmywatchlist' );
75
76        $params = $this->extractRequestParams();
77
78        $continuationManager = new ApiContinuationManager( $this, [], [] );
79        $this->setContinuationManager( $continuationManager );
80
81        $pageSet = $this->getPageSet();
82        // by default we use pageset to extract the page to work on.
83        // title is still supported for backward compatibility
84        if ( !isset( $params['title'] ) ) {
85            $pageSet->execute();
86            $res = $pageSet->getInvalidTitlesAndRevisions( [
87                'invalidTitles',
88                'special',
89                'missingIds',
90                'missingRevIds',
91                'interwikiTitles'
92            ] );
93
94            foreach ( $pageSet->getMissingPages() as $page ) {
95                $r = $this->watchTitle( $page, $user, $params );
96                $r['missing'] = true;
97                $res[] = $r;
98            }
99
100            foreach ( $pageSet->getGoodPages() as $page ) {
101                $r = $this->watchTitle( $page, $user, $params );
102                $res[] = $r;
103            }
104            ApiResult::setIndexedTagName( $res, 'w' );
105        } else {
106            // dont allow use of old title parameter with new pageset parameters.
107            $extraParams = array_keys( array_filter( $pageSet->extractRequestParams(), static function ( $x ) {
108                return $x !== null && $x !== false;
109            } ) );
110
111            if ( $extraParams ) {
112                $this->dieWithError(
113                    [
114                        'apierror-invalidparammix-cannotusewith',
115                        $this->encodeParamName( 'title' ),
116                        $pageSet->encodeParamName( $extraParams[0] )
117                    ],
118                    'invalidparammix'
119                );
120            }
121
122            $title = Title::newFromText( $params['title'] );
123            if ( !$title || !$this->watchlistManager->isWatchable( $title ) ) {
124                $this->dieWithError( [ 'invalidtitle', $params['title'] ] );
125            }
126            $res = $this->watchTitle( $title, $user, $params, true );
127        }
128        $this->getResult()->addValue( null, $this->getModuleName(), $res );
129
130        $this->setContinuationManager( null );
131        $continuationManager->setContinuationIntoResult( $this->getResult() );
132    }
133
134    private function watchTitle( PageIdentity $page, User $user, array $params,
135        bool $compatibilityMode = false
136    ): array {
137        $res = [ 'title' => $this->titleFormatter->getPrefixedText( $page ), 'ns' => $page->getNamespace() ];
138
139        if ( !$this->watchlistManager->isWatchable( $page ) ) {
140            $res['watchable'] = 0;
141            return $res;
142        }
143
144        if ( $params['unwatch'] ) {
145            $status = $this->watchlistManager->removeWatch( $user, $page );
146            $res['unwatched'] = $status->isOK();
147        } else {
148            $expiry = null;
149
150            // NOTE: If an expiry parameter isn't given, any existing expiries remain unchanged.
151            if ( $this->expiryEnabled && isset( $params['expiry'] ) ) {
152                $expiry = $params['expiry'];
153                $res['expiry'] = ApiResult::formatExpiry( $expiry );
154            }
155
156            $status = $this->watchlistManager->addWatch( $user, $page, $expiry );
157            $res['watched'] = $status->isOK();
158        }
159
160        if ( !$status->isOK() ) {
161            if ( $compatibilityMode ) {
162                $this->dieStatus( $status );
163            }
164            $res['errors'] = $this->getErrorFormatter()->arrayFromStatus( $status, 'error' );
165            $res['warnings'] = $this->getErrorFormatter()->arrayFromStatus( $status, 'warning' );
166            if ( !$res['warnings'] ) {
167                unset( $res['warnings'] );
168            }
169        }
170
171        return $res;
172    }
173
174    /**
175     * Get a cached instance of an ApiPageSet object
176     * @return ApiPageSet
177     */
178    private function getPageSet() {
179        $this->mPageSet ??= new ApiPageSet( $this );
180
181        return $this->mPageSet;
182    }
183
184    public function mustBePosted() {
185        return true;
186    }
187
188    public function isWriteMode() {
189        return true;
190    }
191
192    public function needsToken() {
193        return 'watch';
194    }
195
196    public function getAllowedParams( $flags = 0 ) {
197        $result = [
198            'title' => [
199                ParamValidator::PARAM_TYPE => 'string',
200                ParamValidator::PARAM_DEPRECATED => true,
201            ],
202            'expiry' => [
203                ParamValidator::PARAM_TYPE => 'expiry',
204                ExpiryDef::PARAM_MAX => $this->maxDuration,
205                ExpiryDef::PARAM_USE_MAX => true,
206            ],
207            'unwatch' => false,
208            'continue' => [
209                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
210            ],
211        ];
212
213        // If expiry is not enabled, don't accept the parameter.
214        if ( !$this->expiryEnabled ) {
215            unset( $result['expiry'] );
216        }
217
218        if ( $flags ) {
219            $result += $this->getPageSet()->getFinalParams( $flags );
220        }
221
222        return $result;
223    }
224
225    protected function getExamplesMessages() {
226        $title = Title::newMainPage()->getPrefixedText();
227        $mp = rawurlencode( $title );
228
229        // Logically expiry example should go before unwatch examples.
230        $examples = [
231            "action=watch&titles={$mp}&token=123ABC"
232                => 'apihelp-watch-example-watch',
233        ];
234        if ( $this->expiryEnabled ) {
235            $examples["action=watch&titles={$mp}|Foo|Bar&expiry=1%20month&token=123ABC"]
236                = 'apihelp-watch-example-watch-expiry';
237        }
238
239        return array_merge( $examples, [
240            "action=watch&titles={$mp}&unwatch=&token=123ABC"
241                => 'apihelp-watch-example-unwatch',
242            'action=watch&generator=allpages&gapnamespace=0&token=123ABC'
243                => 'apihelp-watch-example-generator',
244        ] );
245    }
246
247    public function getHelpUrls() {
248        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Watch';
249    }
250}
251
252/** @deprecated class alias since 1.43 */
253class_alias( ApiWatch::class, 'ApiWatch' );