includes/api/ApiQueryLangLinks.php

   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 /**
  24  * A query module to list all langlinks (links to corresponding foreign language pages).
  25  *
  26  * @ingroup API
  27  */
  28 class ApiQueryLangLinks extends ApiQueryBase {
  29
  30         public function __construct( ApiQuery $query, $moduleName ) {
  31                 parent::__construct( $query, $moduleName, 'll' );
  32         }
  33
  34         public function execute() {
  35                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  36                         return;
  37                 }
  38
  39                 $params = $this->extractRequestParams();
  40                 $prop = array_flip( (array)$params['prop'] );
  41
  42                 if ( isset( $params['title'] ) && !isset( $params['lang'] ) ) {
  43                         $this->dieWithError(
  44                                 [
  45                                         'apierror-invalidparammix-mustusewith',
  46                                         $this->encodeParamName( 'title' ),
  47                                         $this->encodeParamName( 'lang' ),
  48                                 ],
  49                                 'invalidparammix'
  50                         );
  51                 }
  52
  53                 // Handle deprecated param
  54                 $this->requireMaxOneParameter( $params, 'url', 'prop' );
  55                 if ( $params['url'] ) {
  56                         $prop = [ 'url' => 1 ];
  57                 }
  58
  59                 $this->addFields( [
  60                         'll_from',
  61                         'll_lang',
  62                         'll_title'
  63                 ] );
  64
  65                 $this->addTables( 'langlinks' );
  66                 $this->addWhereFld( 'll_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  67                 if ( !is_null( $params['continue'] ) ) {
  68                         $cont = explode( '|', $params['continue'] );
  69                         $this->dieContinueUsageIf( count( $cont ) != 2 );
  70                         $op = $params['dir'] == 'descending' ? '<' : '>';
  71                         $llfrom = intval( $cont[0] );
  72                         $lllang = $this->getDB()->addQuotes( $cont[1] );
  73                         $this->addWhere(
  74                                 "ll_from $op $llfrom OR " .
  75                                 "(ll_from = $llfrom AND " .
  76                                 "ll_lang $op= $lllang)"
  77                         );
  78                 }
  79
  80                 // FIXME: (follow-up) To allow extensions to add to the language links, we need
  81                 //       to load them all, add the extra links, then apply paging.
  82                 //       Should not be terrible, it's not going to be more than a few hundred links.
  83
  84                 // Note that, since (ll_from, ll_lang) is a unique key, we don't need
  85                 // to sort by ll_title to ensure deterministic ordering.
  86                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  87                 if ( isset( $params['lang'] ) ) {
  88                         $this->addWhereFld( 'll_lang', $params['lang'] );
  89                         if ( isset( $params['title'] ) ) {
  90                                 $this->addWhereFld( 'll_title', $params['title'] );
  91                         }
  92                         $this->addOption( 'ORDER BY', 'll_from' . $sort );
  93                 } else {
  94                         // Don't order by ll_from if it's constant in the WHERE clause
  95                         if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  96                                 $this->addOption( 'ORDER BY', 'll_lang' . $sort );
  97                         } else {
  98                                 $this->addOption( 'ORDER BY', [
  99                                         'll_from' . $sort,
 100                                         'll_lang' . $sort
 101                                 ] );
 102                         }
 103                 }
 104
 105                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 106                 $res = $this->select( __METHOD__ );
 107
 108                 $count = 0;
 109                 foreach ( $res as $row ) {
 110                         if ( ++$count > $params['limit'] ) {
 111                                 // We've reached the one extra which shows that
 112                                 // there are additional pages to be had. Stop here...
 113                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
 114                                 break;
 115                         }
 116                         $entry = [ 'lang' => $row->ll_lang ];
 117                         if ( isset( $prop['url'] ) ) {
 118                                 $title = Title::newFromText( "{$row->ll_lang}:{$row->ll_title}" );
 119                                 if ( $title ) {
 120                                         $entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 121                                 }
 122                         }
 123                         if ( isset( $prop['langname'] ) ) {
 124                                 $entry['langname'] = Language::fetchLanguageName( $row->ll_lang, $params['inlanguagecode'] );
 125                         }
 126                         if ( isset( $prop['autonym'] ) ) {
 127                                 $entry['autonym'] = Language::fetchLanguageName( $row->ll_lang );
 128                         }
 129                         ApiResult::setContentValue( $entry, 'title', $row->ll_title );
 130                         $fit = $this->addPageSubItem( $row->ll_from, $entry );
 131                         if ( !$fit ) {
 132                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
 133                                 break;
 134                         }
 135                 }
 136         }
 137
 138         public function getCacheMode( $params ) {
 139                 return 'public';
 140         }
 141
 142         public function getAllowedParams() {
 143                 global $wgContLang;
 144                 return [
 145                         'prop' => [
 146                                 ApiBase::PARAM_ISMULTI => true,
 147                                 ApiBase::PARAM_TYPE => [
 148                                         'url',
 149                                         'langname',
 150                                         'autonym',
 151                                 ],
 152                                 ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
 153                         ],
 154                         'lang' => null,
 155                         'title' => null,
 156                         'dir' => [
 157                                 ApiBase::PARAM_DFLT => 'ascending',
 158                                 ApiBase::PARAM_TYPE => [
 159                                         'ascending',
 160                                         'descending'
 161                                 ]
 162                         ],
 163                         'inlanguagecode' => $wgContLang->getCode(),
 164                         'limit' => [
 165                                 ApiBase::PARAM_DFLT => 10,
 166                                 ApiBase::PARAM_TYPE => 'limit',
 167                                 ApiBase::PARAM_MIN => 1,
 168                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 169                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 170                         ],
 171                         'continue' => [
 172                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 173                         ],
 174                         'url' => [
 175                                 ApiBase::PARAM_DFLT => false,
 176                                 ApiBase::PARAM_DEPRECATED => true,
 177                         ],
 178                 ];
 179         }
 180
 181         protected function getExamplesMessages() {
 182                 return [
 183                         'action=query&prop=langlinks&titles=Main%20Page&redirects='
 184                                 => 'apihelp-query+langlinks-example-simple',
 185                 ];
 186         }
 187
 188         public function getHelpUrls() {
 189                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Langlinks';
 190         }
 191 }