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| 1 | <?php |
| 2 | /** |
| 3 | * Copyright © 2006 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 | |
| 23 | use MediaWiki\Cache\LinkBatchFactory; |
| 24 | use MediaWiki\Linker\LinksMigration; |
| 25 | use MediaWiki\ParamValidator\TypeDef\NamespaceDef; |
| 26 | use MediaWiki\Title\Title; |
| 27 | use Wikimedia\ParamValidator\ParamValidator; |
| 28 | use Wikimedia\ParamValidator\TypeDef\IntegerDef; |
| 29 | |
| 30 | /** |
| 31 | * A query module to list all wiki links on a given set of pages. |
| 32 | * |
| 33 | * @ingroup API |
| 34 | */ |
| 35 | class ApiQueryLinks extends ApiQueryGeneratorBase { |
| 36 | |
| 37 | private const LINKS = 'links'; |
| 38 | private const TEMPLATES = 'templates'; |
| 39 | |
| 40 | private string $table; |
| 41 | private string $prefix; |
| 42 | private string $titlesParam; |
| 43 | private string $helpUrl; |
| 44 | |
| 45 | private LinkBatchFactory $linkBatchFactory; |
| 46 | private LinksMigration $linksMigration; |
| 47 | |
| 48 | /** |
| 49 | * @param ApiQuery $query |
| 50 | * @param string $moduleName |
| 51 | * @param LinkBatchFactory $linkBatchFactory |
| 52 | * @param LinksMigration $linksMigration |
| 53 | */ |
| 54 | public function __construct( |
| 55 | ApiQuery $query, |
| 56 | $moduleName, |
| 57 | LinkBatchFactory $linkBatchFactory, |
| 58 | LinksMigration $linksMigration |
| 59 | ) { |
| 60 | switch ( $moduleName ) { |
| 61 | case self::LINKS: |
| 62 | $this->table = 'pagelinks'; |
| 63 | $this->prefix = 'pl'; |
| 64 | $this->titlesParam = 'titles'; |
| 65 | $this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Links'; |
| 66 | break; |
| 67 | case self::TEMPLATES: |
| 68 | $this->table = 'templatelinks'; |
| 69 | $this->prefix = 'tl'; |
| 70 | $this->titlesParam = 'templates'; |
| 71 | $this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Templates'; |
| 72 | break; |
| 73 | default: |
| 74 | ApiBase::dieDebug( __METHOD__, 'Unknown module name' ); |
| 75 | } |
| 76 | |
| 77 | parent::__construct( $query, $moduleName, $this->prefix ); |
| 78 | $this->linkBatchFactory = $linkBatchFactory; |
| 79 | $this->linksMigration = $linksMigration; |
| 80 | } |
| 81 | |
| 82 | public function execute() { |
| 83 | $this->run(); |
| 84 | } |
| 85 | |
| 86 | public function getCacheMode( $params ) { |
| 87 | return 'public'; |
| 88 | } |
| 89 | |
| 90 | public function executeGenerator( $resultPageSet ) { |
| 91 | $this->run( $resultPageSet ); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * @param ApiPageSet|null $resultPageSet |
| 96 | */ |
| 97 | private function run( $resultPageSet = null ) { |
| 98 | $pages = $this->getPageSet()->getGoodPages(); |
| 99 | if ( $pages === [] ) { |
| 100 | return; // nothing to do |
| 101 | } |
| 102 | |
| 103 | $params = $this->extractRequestParams(); |
| 104 | |
| 105 | if ( isset( $this->linksMigration::$mapping[$this->table] ) ) { |
| 106 | [ $nsField, $titleField ] = $this->linksMigration->getTitleFields( $this->table ); |
| 107 | $queryInfo = $this->linksMigration->getQueryInfo( $this->table ); |
| 108 | $this->addTables( $queryInfo['tables'] ); |
| 109 | $this->addJoinConds( $queryInfo['joins'] ); |
| 110 | } else { |
| 111 | $this->addTables( $this->table ); |
| 112 | $nsField = $this->prefix . '_namespace'; |
| 113 | $titleField = $this->prefix . '_title'; |
| 114 | } |
| 115 | |
| 116 | $this->addFields( [ |
| 117 | 'pl_from' => $this->prefix . '_from', |
| 118 | 'pl_namespace' => $nsField, |
| 119 | 'pl_title' => $titleField, |
| 120 | ] ); |
| 121 | |
| 122 | $this->addWhereFld( $this->prefix . '_from', array_keys( $pages ) ); |
| 123 | |
| 124 | $multiNS = true; |
| 125 | $multiTitle = true; |
| 126 | if ( $params[$this->titlesParam] ) { |
| 127 | // Filter the titles in PHP so our ORDER BY bug avoidance below works right. |
| 128 | $filterNS = $params['namespace'] ? array_fill_keys( $params['namespace'], true ) : false; |
| 129 | |
| 130 | $lb = $this->linkBatchFactory->newLinkBatch(); |
| 131 | foreach ( $params[$this->titlesParam] as $t ) { |
| 132 | $title = Title::newFromText( $t ); |
| 133 | if ( !$title || $title->isExternal() ) { |
| 134 | $this->addWarning( [ 'apiwarn-invalidtitle', wfEscapeWikiText( $t ) ] ); |
| 135 | } elseif ( !$filterNS || isset( $filterNS[$title->getNamespace()] ) ) { |
| 136 | $lb->addObj( $title ); |
| 137 | } |
| 138 | } |
| 139 | if ( $lb->isEmpty() ) { |
| 140 | // No titles, no results! |
| 141 | return; |
| 142 | } |
| 143 | $cond = $lb->constructSet( $this->prefix, $this->getDB() ); |
| 144 | $this->addWhere( $cond ); |
| 145 | $multiNS = count( $lb->data ) !== 1; |
| 146 | $multiTitle = count( array_merge( ...$lb->data ) ) !== 1; |
| 147 | } elseif ( $params['namespace'] ) { |
| 148 | $this->addWhereFld( $nsField, $params['namespace'] ); |
| 149 | $multiNS = $params['namespace'] === null || count( $params['namespace'] ) !== 1; |
| 150 | } |
| 151 | |
| 152 | if ( $params['continue'] !== null ) { |
| 153 | $db = $this->getDB(); |
| 154 | $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'int', 'int', 'string' ] ); |
| 155 | $op = $params['dir'] == 'descending' ? '<=' : '>='; |
| 156 | $this->addWhere( $db->buildComparison( $op, [ |
| 157 | "{$this->prefix}_from" => $cont[0], |
| 158 | $nsField => $cont[1], |
| 159 | $titleField => $cont[2], |
| 160 | ] ) ); |
| 161 | } |
| 162 | |
| 163 | $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' ); |
| 164 | // Here's some MySQL craziness going on: if you use WHERE foo='bar' |
| 165 | // and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless |
| 166 | // but instead goes and filesorts, because the index for foo was used |
| 167 | // already. To work around this, we drop constant fields in the WHERE |
| 168 | // clause from the ORDER BY clause |
| 169 | $order = []; |
| 170 | if ( count( $pages ) !== 1 ) { |
| 171 | $order[] = $this->prefix . '_from' . $sort; |
| 172 | } |
| 173 | if ( $multiNS ) { |
| 174 | $order[] = $nsField . $sort; |
| 175 | } |
| 176 | if ( $multiTitle ) { |
| 177 | $order[] = $titleField . $sort; |
| 178 | } |
| 179 | if ( $order ) { |
| 180 | $this->addOption( 'ORDER BY', $order ); |
| 181 | } |
| 182 | $this->addOption( 'LIMIT', $params['limit'] + 1 ); |
| 183 | |
| 184 | $res = $this->select( __METHOD__ ); |
| 185 | |
| 186 | if ( $resultPageSet === null ) { |
| 187 | $this->executeGenderCacheFromResultWrapper( $res, __METHOD__, 'pl' ); |
| 188 | |
| 189 | $count = 0; |
| 190 | foreach ( $res as $row ) { |
| 191 | if ( ++$count > $params['limit'] ) { |
| 192 | // We've reached the one extra which shows that |
| 193 | // there are additional pages to be had. Stop here... |
| 194 | $this->setContinueEnumParameter( 'continue', |
| 195 | "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" ); |
| 196 | break; |
| 197 | } |
| 198 | $vals = []; |
| 199 | ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( $row->pl_namespace, $row->pl_title ) ); |
| 200 | $fit = $this->addPageSubItem( $row->pl_from, $vals ); |
| 201 | if ( !$fit ) { |
| 202 | $this->setContinueEnumParameter( 'continue', |
| 203 | "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" ); |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | } else { |
| 208 | $titles = []; |
| 209 | $count = 0; |
| 210 | foreach ( $res as $row ) { |
| 211 | if ( ++$count > $params['limit'] ) { |
| 212 | // We've reached the one extra which shows that |
| 213 | // there are additional pages to be had. Stop here... |
| 214 | $this->setContinueEnumParameter( 'continue', |
| 215 | "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" ); |
| 216 | break; |
| 217 | } |
| 218 | $titles[] = Title::makeTitle( $row->pl_namespace, $row->pl_title ); |
| 219 | } |
| 220 | $resultPageSet->populateFromTitles( $titles ); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | public function getAllowedParams() { |
| 225 | return [ |
| 226 | 'namespace' => [ |
| 227 | ParamValidator::PARAM_TYPE => 'namespace', |
| 228 | ParamValidator::PARAM_ISMULTI => true, |
| 229 | NamespaceDef::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ], |
| 230 | ], |
| 231 | 'limit' => [ |
| 232 | ParamValidator::PARAM_DEFAULT => 10, |
| 233 | ParamValidator::PARAM_TYPE => 'limit', |
| 234 | IntegerDef::PARAM_MIN => 1, |
| 235 | IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1, |
| 236 | IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2 |
| 237 | ], |
| 238 | 'continue' => [ |
| 239 | ApiBase::PARAM_HELP_MSG => 'api-help-param-continue', |
| 240 | ], |
| 241 | $this->titlesParam => [ |
| 242 | ParamValidator::PARAM_ISMULTI => true, |
| 243 | ], |
| 244 | 'dir' => [ |
| 245 | ParamValidator::PARAM_DEFAULT => 'ascending', |
| 246 | ParamValidator::PARAM_TYPE => [ |
| 247 | 'ascending', |
| 248 | 'descending' |
| 249 | ] |
| 250 | ], |
| 251 | ]; |
| 252 | } |
| 253 | |
| 254 | protected function getExamplesMessages() { |
| 255 | $name = $this->getModuleName(); |
| 256 | $path = $this->getModulePath(); |
| 257 | $title = Title::newMainPage()->getPrefixedText(); |
| 258 | $mp = rawurlencode( $title ); |
| 259 | |
| 260 | return [ |
| 261 | "action=query&prop={$name}&titles={$mp}" |
| 262 | => "apihelp-{$path}-example-simple", |
| 263 | "action=query&generator={$name}&titles={$mp}&prop=info" |
| 264 | => "apihelp-{$path}-example-generator", |
| 265 | "action=query&prop={$name}&titles={$mp}&{$this->prefix}namespace=2|10" |
| 266 | => "apihelp-{$path}-example-namespaces", |
| 267 | ]; |
| 268 | } |
| 269 | |
| 270 | public function getHelpUrls() { |
| 271 | return $this->helpUrl; |
| 272 | } |
| 273 | } |