includes/api/ApiQueryLangLinks.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on May 13, 2007
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * A query module to list all langlinks (links to corresponding foreign language pages).
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryLangLinks extends ApiQueryBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'll' );
  36         }
  37
  38         public function execute() {
  39                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  40                         return;
  41                 }
  42
  43                 $params = $this->extractRequestParams();
  44                 $prop = array_flip( (array)$params['prop'] );
  45
  46                 if ( isset( $params['title'] ) && !isset( $params['lang'] ) ) {
  47                         $this->dieUsageMsg( array( 'missingparam', 'lang' ) );
  48                 }
  49
  50                 // Handle deprecated param
  51                 $this->requireMaxOneParameter( $params, 'url', 'prop' );
  52                 if ( $params['url'] ) {
  53                         $prop = array( 'url' => 1 );
  54                 }
  55
  56                 $this->addFields( array(
  57                         'll_from',
  58                         'll_lang',
  59                         'll_title'
  60                 ) );
  61
  62                 $this->addTables( 'langlinks' );
  63                 $this->addWhereFld( 'll_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  64                 if ( !is_null( $params['continue'] ) ) {
  65                         $cont = explode( '|', $params['continue'] );
  66                         $this->dieContinueUsageIf( count( $cont ) != 2 );
  67                         $op = $params['dir'] == 'descending' ? '<' : '>';
  68                         $llfrom = intval( $cont[0] );
  69                         $lllang = $this->getDB()->addQuotes( $cont[1] );
  70                         $this->addWhere(
  71                                 "ll_from $op $llfrom OR " .
  72                                 "(ll_from = $llfrom AND " .
  73                                 "ll_lang $op= $lllang)"
  74                         );
  75                 }
  76
  77                 //FIXME: (follow-up) To allow extensions to add to the language links, we need
  78                 //       to load them all, add the extra links, then apply paging.
  79                 //       Should not be terrible, it's not going to be more than a few hundred links.
  80
  81                 // Note that, since (ll_from, ll_lang) is a unique key, we don't need
  82                 // to sort by ll_title to ensure deterministic ordering.
  83                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  84                 if ( isset( $params['lang'] ) ) {
  85                         $this->addWhereFld( 'll_lang', $params['lang'] );
  86                         if ( isset( $params['title'] ) ) {
  87                                 $this->addWhereFld( 'll_title', $params['title'] );
  88                         }
  89                         $this->addOption( 'ORDER BY', 'll_from' . $sort );
  90                 } else {
  91                         // Don't order by ll_from if it's constant in the WHERE clause
  92                         if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  93                                 $this->addOption( 'ORDER BY', 'll_lang' . $sort );
  94                         } else {
  95                                 $this->addOption( 'ORDER BY', array(
  96                                         'll_from' . $sort,
  97                                         'll_lang' . $sort
  98                                 ) );
  99                         }
 100                 }
 101
 102                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 103                 $res = $this->select( __METHOD__ );
 104
 105                 $count = 0;
 106                 foreach ( $res as $row ) {
 107                         if ( ++$count > $params['limit'] ) {
 108                                 // We've reached the one extra which shows that
 109                                 // there are additional pages to be had. Stop here...
 110                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
 111                                 break;
 112                         }
 113                         $entry = array( 'lang' => $row->ll_lang );
 114                         if ( isset( $prop['url'] ) ) {
 115                                 $title = Title::newFromText( "{$row->ll_lang}:{$row->ll_title}" );
 116                                 if ( $title ) {
 117                                         $entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 118                                 }
 119                         }
 120                         ApiResult::setContent( $entry, $row->ll_title );
 121                         $fit = $this->addPageSubItem( $row->ll_from, $entry );
 122                         if ( !$fit ) {
 123                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
 124                                 break;
 125                         }
 126                 }
 127         }
 128
 129         public function getCacheMode( $params ) {
 130                 return 'public';
 131         }
 132
 133         public function getAllowedParams() {
 134                 return array(
 135                         'limit' => array(
 136                                 ApiBase::PARAM_DFLT => 10,
 137                                 ApiBase::PARAM_TYPE => 'limit',
 138                                 ApiBase::PARAM_MIN => 1,
 139                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 140                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 141                         ),
 142                         'continue' => null,
 143                         'url' => array(
 144                                 ApiBase::PARAM_DFLT => false,
 145                                 ApiBase::PARAM_DEPRECATED => true,
 146                         ),
 147                         'prop' => array(
 148                                 ApiBase::PARAM_ISMULTI => true,
 149                                 ApiBase::PARAM_TYPE => array(
 150                                         'url',
 151                                 )
 152                         ),
 153                         'lang' => null,
 154                         'title' => null,
 155                         'dir' => array(
 156                                 ApiBase::PARAM_DFLT => 'ascending',
 157                                 ApiBase::PARAM_TYPE => array(
 158                                         'ascending',
 159                                         'descending'
 160                                 )
 161                         ),
 162                 );
 163         }
 164
 165         public function getParamDescription() {
 166                 return array(
 167                         'limit' => 'How many langlinks to return',
 168                         'continue' => 'When more results are available, use this to continue',
 169                         'url' => "Whether to get the full URL (Cannot be used with {$this->getModulePrefix()}prop)",
 170                         'prop' => array(
 171                                 'Which additional properties to get for each interlanguage link',
 172                                 ' url - Adds the full URL',
 173                         ),
 174                         'lang' => 'Language code',
 175                         'title' => "Link to search for. Must be used with {$this->getModulePrefix()}lang",
 176                         'dir' => 'The direction in which to list',
 177                 );
 178         }
 179
 180         public function getResultProperties() {
 181                 return array(
 182                         '' => array(
 183                                 'lang' => 'string',
 184                                 'url' => array(
 185                                         ApiBase::PROP_TYPE => 'string',
 186                                         ApiBase::PROP_NULLABLE => true
 187                                 ),
 188                                 '*' => 'string'
 189                         )
 190                 );
 191         }
 192
 193         public function getDescription() {
 194                 return 'Returns all interlanguage links from the given page(s)';
 195         }
 196
 197         public function getPossibleErrors() {
 198                 return array_merge( parent::getPossibleErrors(),
 199                         $this->getRequireMaxOneParameterErrorMessages(
 200                                 array( 'url', 'prop' )
 201                         ),
 202                         array(
 203                                 array( 'missingparam', 'lang' ),
 204                         )
 205                 );
 206         }
 207
 208         public function getExamples() {
 209                 return array(
 210                         'api.php?action=query&prop=langlinks&titles=Main%20Page&redirects='
 211                                 => 'Get interlanguage links from the [[Main Page]]',
 212                 );
 213         }
 214
 215         public function getHelpUrls() {
 216                 return 'https://www.mediawiki.org/wiki/API:Properties#langlinks_.2F_ll';
 217         }
 218 }