includes/api/ApiQueryExternalLinks.php

   1 <?php
   2
   3 /*
   4  * Created on May 13, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 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  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if ( !defined( 'MEDIAWIKI' ) ) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ( "ApiQueryBase.php" );
  29 }
  30
  31 /**
  32  * A query module to list all external URLs found on a given set of pages.
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryExternalLinks extends ApiQueryBase {
  37
  38         public function __construct( $query, $moduleName ) {
  39                 parent :: __construct( $query, $moduleName, 'el' );
  40         }
  41
  42         public function execute() {
  43                 if ( $this->getPageSet()->getGoodTitleCount() == 0 )
  44                         return;
  45
  46                 $params = $this->extractRequestParams();
  47                 $this->addFields( array (
  48                         'el_from',
  49                         'el_to'
  50                 ) );
  51
  52                 $this->addTables( 'externallinks' );
  53                 $this->addWhereFld( 'el_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  54                 # Don't order by el_from if it's constant in the WHERE clause
  55                 if ( count( $this->getPageSet()->getGoodTitles() ) != 1 )
  56                         $this->addOption( 'ORDER BY', 'el_from' );
  57                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  58                 if ( !is_null( $params['offset'] ) )
  59                         $this->addOption( 'OFFSET', $params['offset'] );
  60
  61                 $db = $this->getDB();
  62                 $res = $this->select( __METHOD__ );
  63
  64                 $count = 0;
  65                 while ( $row = $db->fetchObject( $res ) ) {
  66                         if ( ++$count > $params['limit'] ) {
  67                                 // We've reached the one extra which shows that
  68                                 // there are additional pages to be had. Stop here...
  69                                 $this->setContinueEnumParameter( 'offset', @$params['offset'] + $params['limit'] );
  70                                 break;
  71                         }
  72                         $entry = array();
  73                         ApiResult :: setContent( $entry, $row->el_to );
  74                         $fit = $this->addPageSubItem( $row->el_from, $entry );
  75                         if ( !$fit )
  76                         {
  77                                 $this->setContinueEnumParameter( 'offset', @$params['offset'] + $count - 1 );
  78                                 break;
  79                         }
  80                 }
  81                 $db->freeResult( $res );
  82         }
  83
  84         public function getAllowedParams() {
  85                 return array(
  86                                 'limit' => array(
  87                                         ApiBase :: PARAM_DFLT => 10,
  88                                         ApiBase :: PARAM_TYPE => 'limit',
  89                                         ApiBase :: PARAM_MIN => 1,
  90                                         ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
  91                                         ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
  92                                 ),
  93                                 'offset' => null,
  94                 );
  95         }
  96
  97         public function getParamDescription () {
  98                 return array(
  99                         'limit' => 'How many links to return',
 100                         'offset' => 'When more results are available, use this to continue',
 101                 );
 102         }
 103
 104         public function getDescription() {
 105                 return 'Returns all external urls (not interwikies) from the given page(s)';
 106         }
 107
 108         protected function getExamples() {
 109                 return array (
 110                                 "Get a list of external links on the [[Main Page]]:",
 111                                 "  api.php?action=query&prop=extlinks&titles=Main%20Page",
 112                         );
 113         }
 114
 115         public function getVersion() {
 116                 return __CLASS__ . ': $Id$';
 117         }
 118 }