includes/api/ApiQueryLangBacklinks.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.17+
   4  *
   5  * Created on May 14, 2011
   6  *
   7  * Copyright © 2011 Sam Reed
   8  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @file
  26  */
  27
  28 /**
  29  * This gives links pointing to the given interwiki
  30  * @ingroup API
  31  */
  32 class ApiQueryLangBacklinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'lbl' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function executeGenerator( $resultPageSet ) {
  43                 $this->run( $resultPageSet );
  44         }
  45
  46         /**
  47          * @param $resultPageSet ApiPageSet
  48          * @return void
  49          */
  50         public function run( $resultPageSet = null ) {
  51                 $params = $this->extractRequestParams();
  52
  53                 if ( isset( $params['title'] ) && !isset( $params['lang'] ) ) {
  54                         $this->dieUsageMsg( array( 'missingparam', 'lang' ) );
  55                 }
  56
  57                 if ( !is_null( $params['continue'] ) ) {
  58                         $cont = explode( '|', $params['continue'] );
  59                         if ( count( $cont ) != 3 ) {
  60                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  61                                         'original value returned by the previous query', '_badcontinue' );
  62                         }
  63
  64                         $db = $this->getDB();
  65                         $op = $params['dir'] == 'descending' ? '<' : '>';
  66                         $prefix = $db->addQuotes( $cont[0] );
  67                         $title = $db->addQuotes( $cont[1] );
  68                         $from = intval( $cont[2] );
  69                         $this->addWhere(
  70                                 "ll_lang $op $prefix OR " .
  71                                 "(ll_lang = $prefix AND " .
  72                                 "(ll_title $op $title OR " .
  73                                 "(ll_title = $title AND " .
  74                                 "ll_from $op= $from)))"
  75                         );
  76                 }
  77
  78                 $prop = array_flip( $params['prop'] );
  79                 $lllang = isset( $prop['lllang'] );
  80                 $lltitle = isset( $prop['lltitle'] );
  81
  82                 $this->addTables( array( 'langlinks', 'page' ) );
  83                 $this->addWhere( 'll_from = page_id' );
  84
  85                 $this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect',
  86                         'll_from', 'll_lang', 'll_title' ) );
  87
  88                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  89                 if ( isset( $params['lang'] ) ) {
  90                         $this->addWhereFld( 'll_lang', $params['lang'] );
  91                         if ( isset( $params['title'] ) ) {
  92                                 $this->addWhereFld( 'll_title', $params['title'] );
  93                                 $this->addOption( 'ORDER BY', 'll_from' . $sort );
  94                         } else {
  95                                 $this->addOption( 'ORDER BY', array(
  96                                         'll_title' . $sort,
  97                                         'll_from' . $sort
  98                                 ));
  99                         }
 100                 } else {
 101                         $this->addOption( 'ORDER BY', array(
 102                                 'll_lang' . $sort,
 103                                 'll_title' . $sort,
 104                                 'll_from' . $sort
 105                         ));
 106                 }
 107
 108                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 109
 110                 $res = $this->select( __METHOD__ );
 111
 112                 $pages = array();
 113
 114                 $count = 0;
 115                 $result = $this->getResult();
 116                 foreach ( $res as $row ) {
 117                         if ( ++ $count > $params['limit'] ) {
 118                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 119                                 // Continue string preserved in case the redirect query doesn't pass the limit
 120                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_lang}|{$row->ll_title}|{$row->ll_from}" );
 121                                 break;
 122                         }
 123
 124                         if ( !is_null( $resultPageSet ) ) {
 125                                 $pages[] = Title::newFromRow( $row );
 126                         } else {
 127                                 $entry = array( 'pageid' => $row->page_id );
 128
 129                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 130                                 ApiQueryBase::addTitleInfo( $entry, $title );
 131
 132                                 if ( $row->page_is_redirect ) {
 133                                         $entry['redirect'] = '';
 134                                 }
 135
 136                                 if ( $lllang ) {
 137                                         $entry['lllang'] = $row->ll_lang;
 138                                 }
 139
 140                                 if ( $lltitle ) {
 141                                         $entry['lltitle'] = $row->ll_title;
 142                                 }
 143
 144                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $entry );
 145                                 if ( !$fit ) {
 146                                         $this->setContinueEnumParameter( 'continue', "{$row->ll_lang}|{$row->ll_title}|{$row->ll_from}" );
 147                                         break;
 148                                 }
 149                         }
 150                 }
 151
 152                 if ( is_null( $resultPageSet ) ) {
 153                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'll' );
 154                 } else {
 155                         $resultPageSet->populateFromTitles( $pages );
 156                 }
 157         }
 158
 159         public function getCacheMode( $params ) {
 160                 return 'public';
 161         }
 162
 163         public function getAllowedParams() {
 164                 return array(
 165                         'lang' => null,
 166                         'title' => null,
 167                         'continue' => null,
 168                         'limit' => array(
 169                                 ApiBase::PARAM_DFLT => 10,
 170                                 ApiBase::PARAM_TYPE => 'limit',
 171                                 ApiBase::PARAM_MIN => 1,
 172                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 173                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 174                         ),
 175                         'prop' => array(
 176                                 ApiBase::PARAM_ISMULTI => true,
 177                                 ApiBase::PARAM_DFLT => '',
 178                                 ApiBase::PARAM_TYPE => array(
 179                                         'lllang',
 180                                         'lltitle',
 181                                 ),
 182                         ),
 183                         'dir' => array(
 184                                 ApiBase::PARAM_DFLT => 'ascending',
 185                                 ApiBase::PARAM_TYPE => array(
 186                                         'ascending',
 187                                         'descending'
 188                                 )
 189                         ),
 190                 );
 191         }
 192
 193         public function getParamDescription() {
 194                 return array(
 195                         'lang' => 'Language for the language link',
 196                         'title' => "Language link to search for. Must be used with {$this->getModulePrefix()}lang",
 197                         'continue' => 'When more results are available, use this to continue',
 198                         'prop' => array(
 199                                 'Which properties to get',
 200                                 ' lllang         - Adds the language code of the language link',
 201                                 ' lltitle        - Adds the title of the language ink',
 202                         ),
 203                         'limit' => 'How many total pages to return',
 204                         'dir' => 'The direction in which to list',
 205                 );
 206         }
 207
 208         public function getResultProperties() {
 209                 return array(
 210                         '' => array(
 211                                 'pageid' => 'integer',
 212                                 'ns' => 'namespace',
 213                                 'title' => 'string',
 214                                 'redirect' => 'boolean'
 215                         ),
 216                         'lllang' => array(
 217                                 'lllang' => 'string'
 218                         ),
 219                         'lltitle' => array(
 220                                 'lltitle' => 'string'
 221                         )
 222                 );
 223         }
 224
 225         public function getDescription() {
 226                 return array( 'Find all pages that link to the given language link.',
 227                         'Can be used to find all links with a language code, or',
 228                         'all links to a title (with a given language).',
 229                         'Using neither parameter is effectively "All Language Links"',
 230                 );
 231         }
 232
 233         public function getPossibleErrors() {
 234                 return array_merge( parent::getPossibleErrors(), array(
 235                         array( 'missingparam', 'lang' ),
 236                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 237                 ) );
 238         }
 239
 240         public function getExamples() {
 241                 return array(
 242                         'api.php?action=query&list=langbacklinks&lbltitle=Test&lbllang=fr',
 243                         'api.php?action=query&generator=langbacklinks&glbltitle=Test&glbllang=fr&prop=info'
 244                 );
 245         }
 246
 247         public function getVersion() {
 248                 return __CLASS__ . ': $Id$';
 249         }
 250 }