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| 1 | <?php |
| 2 | /** |
| 3 | * Implements Special:DoubleRedirects |
| 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 | * @ingroup SpecialPage |
| 22 | */ |
| 23 | |
| 24 | namespace MediaWiki\Specials; |
| 25 | |
| 26 | use MediaWiki\Cache\LinkBatchFactory; |
| 27 | use MediaWiki\Content\IContentHandlerFactory; |
| 28 | use MediaWiki\SpecialPage\QueryPage; |
| 29 | use MediaWiki\Title\Title; |
| 30 | use Skin; |
| 31 | use stdClass; |
| 32 | use Wikimedia\Rdbms\IConnectionProvider; |
| 33 | use Wikimedia\Rdbms\IDatabase; |
| 34 | use Wikimedia\Rdbms\IResultWrapper; |
| 35 | |
| 36 | /** |
| 37 | * A special page listing redirects to redirecting page. |
| 38 | * The software will automatically not follow double redirects, to prevent loops. |
| 39 | * |
| 40 | * @ingroup SpecialPage |
| 41 | */ |
| 42 | class SpecialDoubleRedirects extends QueryPage { |
| 43 | |
| 44 | private IContentHandlerFactory $contentHandlerFactory; |
| 45 | private LinkBatchFactory $linkBatchFactory; |
| 46 | |
| 47 | /** |
| 48 | * @param IContentHandlerFactory $contentHandlerFactory |
| 49 | * @param LinkBatchFactory $linkBatchFactory |
| 50 | * @param IConnectionProvider $dbProvider |
| 51 | */ |
| 52 | public function __construct( |
| 53 | IContentHandlerFactory $contentHandlerFactory, |
| 54 | LinkBatchFactory $linkBatchFactory, |
| 55 | IConnectionProvider $dbProvider |
| 56 | ) { |
| 57 | parent::__construct( 'DoubleRedirects' ); |
| 58 | $this->contentHandlerFactory = $contentHandlerFactory; |
| 59 | $this->linkBatchFactory = $linkBatchFactory; |
| 60 | $this->setDatabaseProvider( $dbProvider ); |
| 61 | } |
| 62 | |
| 63 | public function isExpensive() { |
| 64 | return true; |
| 65 | } |
| 66 | |
| 67 | public function isSyndicated() { |
| 68 | return false; |
| 69 | } |
| 70 | |
| 71 | protected function sortDescending() { |
| 72 | return false; |
| 73 | } |
| 74 | |
| 75 | protected function getPageHeader() { |
| 76 | return $this->msg( 'doubleredirectstext' )->parseAsBlock(); |
| 77 | } |
| 78 | |
| 79 | private function reallyGetQueryInfo( $namespace = null, $title = null ) { |
| 80 | $limitToTitle = !( $namespace === null && $title === null ); |
| 81 | $retval = [ |
| 82 | 'tables' => [ |
| 83 | 'ra' => 'redirect', |
| 84 | 'rb' => 'redirect', |
| 85 | 'pa' => 'page', |
| 86 | 'pb' => 'page' |
| 87 | ], |
| 88 | 'fields' => [ |
| 89 | 'namespace' => 'pa.page_namespace', |
| 90 | 'title' => 'pa.page_title', |
| 91 | |
| 92 | 'b_namespace' => 'pb.page_namespace', |
| 93 | 'b_title' => 'pb.page_title', |
| 94 | 'b_fragment' => 'ra.rd_fragment', |
| 95 | |
| 96 | // Select fields from redirect instead of page. Because there may |
| 97 | // not actually be a page table row for this target (e.g. for interwiki redirects) |
| 98 | 'c_namespace' => 'rb.rd_namespace', |
| 99 | 'c_title' => 'rb.rd_title', |
| 100 | 'c_fragment' => 'rb.rd_fragment', |
| 101 | 'c_interwiki' => 'rb.rd_interwiki', |
| 102 | ], |
| 103 | 'conds' => [ |
| 104 | 'ra.rd_from = pa.page_id', |
| 105 | |
| 106 | // Filter out redirects where the target goes interwiki (T42353). |
| 107 | // This isn't an optimization, it is required for correct results, |
| 108 | // otherwise a non-double redirect like Bar -> w:Foo will show up |
| 109 | // like "Bar -> Foo -> w:Foo". |
| 110 | 'ra.rd_interwiki' => '', |
| 111 | |
| 112 | 'pb.page_namespace = ra.rd_namespace', |
| 113 | 'pb.page_title = ra.rd_title', |
| 114 | |
| 115 | 'rb.rd_from = pb.page_id', |
| 116 | ] |
| 117 | ]; |
| 118 | |
| 119 | if ( $limitToTitle ) { |
| 120 | $retval['conds']['pa.page_namespace'] = $namespace; |
| 121 | $retval['conds']['pa.page_title'] = $title; |
| 122 | } |
| 123 | |
| 124 | return $retval; |
| 125 | } |
| 126 | |
| 127 | public function getQueryInfo() { |
| 128 | return $this->reallyGetQueryInfo(); |
| 129 | } |
| 130 | |
| 131 | protected function getOrderFields() { |
| 132 | return [ 'ra.rd_namespace', 'ra.rd_title' ]; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @param Skin $skin |
| 137 | * @param stdClass $result Result row |
| 138 | * @return string |
| 139 | */ |
| 140 | public function formatResult( $skin, $result ) { |
| 141 | // If no Title B or C is in the query, it means this came from |
| 142 | // querycache (which only saves the 3 columns for title A). |
| 143 | // That does save the bulk of the query cost, but now we need to |
| 144 | // get a little more detail about each individual entry quickly |
| 145 | // using the filter of reallyGetQueryInfo. |
| 146 | $deep = false; |
| 147 | if ( $result ) { |
| 148 | if ( isset( $result->b_namespace ) ) { |
| 149 | $deep = $result; |
| 150 | } else { |
| 151 | $qi = $this->reallyGetQueryInfo( |
| 152 | $result->namespace, |
| 153 | $result->title |
| 154 | ); |
| 155 | $deep = $this->getDatabaseProvider()->getReplicaDatabase()->selectRow( |
| 156 | $qi['tables'], |
| 157 | $qi['fields'], |
| 158 | $qi['conds'], |
| 159 | __METHOD__ |
| 160 | ); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | $titleA = Title::makeTitle( $result->namespace, $result->title ); |
| 165 | |
| 166 | $linkRenderer = $this->getLinkRenderer(); |
| 167 | if ( !$deep ) { |
| 168 | return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>'; |
| 169 | } |
| 170 | |
| 171 | // if the page is editable, add an edit link |
| 172 | if ( |
| 173 | // check user permissions |
| 174 | $this->getAuthority()->isAllowed( 'edit' ) && |
| 175 | // check, if the content model is editable through action=edit |
| 176 | $this->contentHandlerFactory->getContentHandler( $titleA->getContentModel() ) |
| 177 | ->supportsDirectEditing() |
| 178 | ) { |
| 179 | $edit = $linkRenderer->makeKnownLink( |
| 180 | $titleA, |
| 181 | $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(), |
| 182 | [], |
| 183 | [ 'action' => 'edit' ] |
| 184 | ); |
| 185 | } else { |
| 186 | $edit = ''; |
| 187 | } |
| 188 | |
| 189 | $linkA = $linkRenderer->makeKnownLink( |
| 190 | $titleA, |
| 191 | null, |
| 192 | [], |
| 193 | [ 'redirect' => 'no' ] |
| 194 | ); |
| 195 | |
| 196 | $titleB = Title::makeTitle( $deep->b_namespace, $deep->b_title ); |
| 197 | // We show fragment, but don't link to it, as it probably doesn't exist anymore. |
| 198 | $titleBFrag = Title::makeTitle( $deep->b_namespace, $deep->b_title, $deep->b_fragment ); |
| 199 | $linkB = $linkRenderer->makeKnownLink( |
| 200 | $titleB, |
| 201 | $titleBFrag->getFullText(), |
| 202 | [], |
| 203 | [ 'redirect' => 'no' ] |
| 204 | ); |
| 205 | |
| 206 | $titleC = Title::makeTitle( |
| 207 | $deep->c_namespace, |
| 208 | $deep->c_title, |
| 209 | $deep->c_fragment, |
| 210 | $deep->c_interwiki |
| 211 | ); |
| 212 | $linkC = $linkRenderer->makeKnownLink( $titleC, $titleC->getFullText() ); |
| 213 | |
| 214 | $lang = $this->getLanguage(); |
| 215 | $arr = $lang->getArrow() . $lang->getDirMark(); |
| 216 | |
| 217 | return ( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" ); |
| 218 | } |
| 219 | |
| 220 | public function execute( $par ) { |
| 221 | $this->addHelpLink( 'Help:Redirects' ); |
| 222 | parent::execute( $par ); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Cache page content model and gender distinction for performance |
| 227 | * |
| 228 | * @param IDatabase $db |
| 229 | * @param IResultWrapper $res |
| 230 | */ |
| 231 | public function preprocessResults( $db, $res ) { |
| 232 | if ( !$res->numRows() ) { |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | $batch = $this->linkBatchFactory->newLinkBatch(); |
| 237 | foreach ( $res as $row ) { |
| 238 | $batch->add( $row->namespace, $row->title ); |
| 239 | if ( isset( $row->b_namespace ) ) { |
| 240 | // lazy loaded when using cached results |
| 241 | $batch->add( $row->b_namespace, $row->b_title ); |
| 242 | } |
| 243 | if ( isset( $row->c_interwiki ) && !$row->c_interwiki ) { |
| 244 | // lazy loaded when using cached result, not added when interwiki link |
| 245 | $batch->add( $row->c_namespace, $row->c_title ); |
| 246 | } |
| 247 | } |
| 248 | $batch->execute(); |
| 249 | |
| 250 | // Back to start for display |
| 251 | $res->seek( 0 ); |
| 252 | } |
| 253 | |
| 254 | protected function getGroupName() { |
| 255 | return 'maintenance'; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /** @deprecated class alias since 1.41 */ |
| 260 | class_alias( SpecialDoubleRedirects::class, 'SpecialDoubleRedirects' ); |