includes/api/ApiQueryExternalLinks.php

   1 <?php
   2
   3 /**
   4  * Created on May 13, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   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  * 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
  47                 $params = $this->extractRequestParams();
  48                 $this->addFields( array(
  49                         'el_from',
  50                         'el_to'
  51                 ) );
  52
  53                 $this->addTables( 'externallinks' );
  54                 $this->addWhereFld( 'el_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  55
  56                 // Don't order by el_from if it's constant in the WHERE clause
  57                 if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
  58                         $this->addOption( 'ORDER BY', 'el_from' );
  59                 }
  60
  61                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  62                 if ( !is_null( $params['offset'] ) ) {
  63                         $this->addOption( 'OFFSET', $params['offset'] );
  64                 }
  65
  66                 $db = $this->getDB();
  67                 $res = $this->select( __METHOD__ );
  68
  69                 $count = 0;
  70                 while ( $row = $db->fetchObject( $res ) ) {
  71                         if ( ++$count > $params['limit'] ) {
  72                                 // We've reached the one extra which shows that
  73                                 // there are additional pages to be had. Stop here...
  74                                 $this->setContinueEnumParameter( 'offset', @$params['offset'] + $params['limit'] );
  75                                 break;
  76                         }
  77                         $entry = array();
  78                         ApiResult::setContent( $entry, $row->el_to );
  79                         $fit = $this->addPageSubItem( $row->el_from, $entry );
  80                         if ( !$fit ) {
  81                                 $this->setContinueEnumParameter( 'offset', @$params['offset'] + $count - 1 );
  82                                 break;
  83                         }
  84                 }
  85                 $db->freeResult( $res );
  86         }
  87
  88         public function getAllowedParams() {
  89                 return array(
  90                         'limit' => array(
  91                                 ApiBase::PARAM_DFLT => 10,
  92                                 ApiBase::PARAM_TYPE => 'limit',
  93                                 ApiBase::PARAM_MIN => 1,
  94                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
  95                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
  96                         ),
  97                         'offset' => null,
  98                 );
  99         }
 100
 101         public function getParamDescription() {
 102                 return array(
 103                         'limit' => 'How many links to return',
 104                         'offset' => 'When more results are available, use this to continue',
 105                 );
 106         }
 107
 108         public function getDescription() {
 109                 return 'Returns all external urls (not interwikies) from the given page(s)';
 110         }
 111
 112         protected function getExamples() {
 113                 return array(
 114                         'Get a list of external links on the [[Main Page]]:',
 115                         '  api.php?action=query&prop=extlinks&titles=Main%20Page',
 116                 );
 117         }
 118
 119         public function getVersion() {
 120                 return __CLASS__ . ': $Id$';
 121         }
 122 }