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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest\Handler; |
| 4 | |
| 5 | use MediaFileTrait; |
| 6 | use MediaWiki\Page\ExistingPageRecord; |
| 7 | use MediaWiki\Page\PageLookup; |
| 8 | use MediaWiki\Rest\LocalizedHttpException; |
| 9 | use MediaWiki\Rest\Response; |
| 10 | use MediaWiki\Rest\SimpleHandler; |
| 11 | use RepoGroup; |
| 12 | use Wikimedia\Message\MessageValue; |
| 13 | use Wikimedia\ParamValidator\ParamValidator; |
| 14 | use Wikimedia\Rdbms\IConnectionProvider; |
| 15 | |
| 16 | /** |
| 17 | * Handler class for Core REST API endpoints that perform operations on revisions |
| 18 | */ |
| 19 | class MediaLinksHandler extends SimpleHandler { |
| 20 | use MediaFileTrait; |
| 21 | |
| 22 | /** int The maximum number of media links to return */ |
| 23 | private const MAX_NUM_LINKS = 100; |
| 24 | |
| 25 | /** @var IConnectionProvider */ |
| 26 | private $dbProvider; |
| 27 | |
| 28 | /** @var RepoGroup */ |
| 29 | private $repoGroup; |
| 30 | |
| 31 | /** @var PageLookup */ |
| 32 | private $pageLookup; |
| 33 | |
| 34 | /** |
| 35 | * @var ExistingPageRecord|false|null |
| 36 | */ |
| 37 | private $page = false; |
| 38 | |
| 39 | /** |
| 40 | * @param IConnectionProvider $dbProvider |
| 41 | * @param RepoGroup $repoGroup |
| 42 | * @param PageLookup $pageLookup |
| 43 | */ |
| 44 | public function __construct( |
| 45 | IConnectionProvider $dbProvider, |
| 46 | RepoGroup $repoGroup, |
| 47 | PageLookup $pageLookup |
| 48 | ) { |
| 49 | $this->dbProvider = $dbProvider; |
| 50 | $this->repoGroup = $repoGroup; |
| 51 | $this->pageLookup = $pageLookup; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * @return ExistingPageRecord|null |
| 56 | */ |
| 57 | private function getPage(): ?ExistingPageRecord { |
| 58 | if ( $this->page === false ) { |
| 59 | $this->page = $this->pageLookup->getExistingPageByText( |
| 60 | $this->getValidatedParams()['title'] |
| 61 | ); |
| 62 | } |
| 63 | return $this->page; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @param string $title |
| 68 | * @return Response |
| 69 | * @throws LocalizedHttpException |
| 70 | */ |
| 71 | public function run( $title ) { |
| 72 | $page = $this->getPage(); |
| 73 | if ( !$page ) { |
| 74 | throw new LocalizedHttpException( |
| 75 | MessageValue::new( 'rest-nonexistent-title' )->plaintextParams( $title ), |
| 76 | 404 |
| 77 | ); |
| 78 | } |
| 79 | |
| 80 | if ( !$this->getAuthority()->authorizeRead( 'read', $page ) ) { |
| 81 | throw new LocalizedHttpException( |
| 82 | MessageValue::new( 'rest-permission-denied-title' )->plaintextParams( $title ), |
| 83 | 403 |
| 84 | ); |
| 85 | } |
| 86 | |
| 87 | // @todo: add continuation if too many links are found |
| 88 | $results = $this->getDbResults( $page->getId() ); |
| 89 | if ( count( $results ) > $this->getMaxNumLinks() ) { |
| 90 | throw new LocalizedHttpException( |
| 91 | MessageValue::new( 'rest-media-too-many-links' ) |
| 92 | ->plaintextParams( $title ) |
| 93 | ->numParams( $this->getMaxNumLinks() ), |
| 94 | 400 |
| 95 | ); |
| 96 | } |
| 97 | $response = $this->processDbResults( $results ); |
| 98 | return $this->getResponseFactory()->createJson( $response ); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * @param int $pageId the id of the page to load media links for |
| 103 | * @return array the results |
| 104 | */ |
| 105 | private function getDbResults( int $pageId ) { |
| 106 | return $this->dbProvider->getReplicaDatabase()->newSelectQueryBuilder() |
| 107 | ->select( 'il_to' ) |
| 108 | ->from( 'imagelinks' ) |
| 109 | ->where( [ 'il_from' => $pageId ] ) |
| 110 | ->orderBy( 'il_to' ) |
| 111 | ->limit( $this->getMaxNumLinks() + 1 ) |
| 112 | ->caller( __METHOD__ )->fetchFieldValues(); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * @param array $results database results, or an empty array if none |
| 117 | * @return array response data |
| 118 | */ |
| 119 | private function processDbResults( $results ) { |
| 120 | // Using "private" here means an equivalent of the Action API's "anon-public-user-private" |
| 121 | // caching model would be necessary, if caching is ever added to this endpoint. |
| 122 | $performer = $this->getAuthority(); |
| 123 | $findTitles = array_map( static function ( $title ) use ( $performer ) { |
| 124 | return [ |
| 125 | 'title' => $title, |
| 126 | 'private' => $performer, |
| 127 | ]; |
| 128 | }, $results ); |
| 129 | |
| 130 | $files = $this->repoGroup->findFiles( $findTitles ); |
| 131 | [ $maxWidth, $maxHeight ] = self::getImageLimitsFromOption( |
| 132 | $this->getAuthority()->getUser(), |
| 133 | 'imagesize' |
| 134 | ); |
| 135 | $transforms = [ |
| 136 | 'preferred' => [ |
| 137 | 'maxWidth' => $maxWidth, |
| 138 | 'maxHeight' => $maxHeight, |
| 139 | ] |
| 140 | ]; |
| 141 | $response = []; |
| 142 | foreach ( $files as $file ) { |
| 143 | $response[] = $this->getFileInfo( $file, $performer, $transforms ); |
| 144 | } |
| 145 | |
| 146 | $response = [ |
| 147 | 'files' => $response |
| 148 | ]; |
| 149 | |
| 150 | return $response; |
| 151 | } |
| 152 | |
| 153 | public function needsWriteAccess() { |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | public function getParamSettings() { |
| 158 | return [ |
| 159 | 'title' => [ |
| 160 | self::PARAM_SOURCE => 'path', |
| 161 | ParamValidator::PARAM_TYPE => 'string', |
| 162 | ParamValidator::PARAM_REQUIRED => true, |
| 163 | ], |
| 164 | ]; |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * @return string|null |
| 169 | * @throws LocalizedHttpException |
| 170 | */ |
| 171 | protected function getETag(): ?string { |
| 172 | $page = $this->getPage(); |
| 173 | if ( !$page ) { |
| 174 | return null; |
| 175 | } |
| 176 | |
| 177 | // XXX: use hash of the rendered HTML? |
| 178 | return '"' . $page->getLatest() . '@' . wfTimestamp( TS_MW, $page->getTouched() ) . '"'; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * @return string|null |
| 183 | * @throws LocalizedHttpException |
| 184 | */ |
| 185 | protected function getLastModified(): ?string { |
| 186 | $page = $this->getPage(); |
| 187 | return $page ? $page->getTouched() : null; |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * @return bool |
| 192 | */ |
| 193 | protected function hasRepresentation() { |
| 194 | return (bool)$this->getPage(); |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * For testing |
| 199 | * |
| 200 | * @unstable |
| 201 | */ |
| 202 | protected function getMaxNumLinks(): int { |
| 203 | return self::MAX_NUM_LINKS; |
| 204 | } |
| 205 | } |