includes/api/ApiQueryIWBacklinks.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.17+
   4  *
   5  * Created on May 14, 2010
   6  *
   7  * Copyright © 2010 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 if ( !defined( 'MEDIAWIKI' ) ) {
  29         // Eclipse helper - will be ignored in production
  30         require_once( "ApiQueryBase.php" );
  31 }
  32
  33 /**
  34  * This gives links pointing to the given interwiki
  35  * @ingroup API
  36  */
  37 class ApiQueryIWBacklinks extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'iwbl' );
  41         }
  42
  43         public function execute() {
  44                 $this->run();
  45         }
  46
  47         public function executeGenerator( $resultPageSet ) {
  48                 $this->run( $resultPageSet );
  49         }
  50
  51         public function run( $resultPageSet = null ) {
  52                 $params = $this->extractRequestParams();
  53
  54                 if ( isset( $params['title'] ) && !isset( $params['prefix'] ) ) {
  55                         $this->dieUsageMsg( array( 'missingparam', 'prefix' ) );
  56                 }
  57
  58                 if ( !is_null( $params['continue'] ) ) {
  59                         $cont = explode( '|', $params['continue'] );
  60                         if ( count( $cont ) != 3 ) {
  61                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  62                                         'original value returned by the previous query', '_badcontinue' );
  63                         }
  64
  65                         $prefix = $this->getDB()->strencode( $cont[0] );
  66                         $title = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
  67                         $from = intval( $cont[2] );
  68                         $this->addWhere(
  69                                 "iwl_prefix > '$prefix' OR " .
  70                                 "(iwl_prefix = '$prefix' AND " .
  71                                 "(iwl_title > '$title' OR " .
  72                                 "(iwl_title = '$title' AND " .
  73                                 "iwl_from >= $from)))"
  74                         );
  75                 }
  76
  77                 $prop = array_flip( $params['prop'] );
  78                 $iwprefix = isset( $prop['iwprefix'] );
  79                 $iwtitle = isset( $prop['iwtitle'] );
  80
  81                 $this->addTables( array( 'iwlinks', 'page' ) );
  82                 $this->addWhere( 'iwl_from = page_id' );
  83
  84                 $this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect',
  85                         'iwl_from', 'iwl_prefix', 'iwl_title' ) );
  86
  87                 if ( isset( $params['prefix'] ) ) {
  88                         $this->addWhereFld( 'iwl_prefix', $params['prefix'] );
  89                         if ( isset( $params['title'] ) ) {
  90                                 $this->addWhereFld( 'iwl_title', $params['title'] );
  91                                 $this->addOption( 'ORDER BY', 'iwl_from' );
  92                         } else {
  93                                 $this->addOption( 'ORDER BY', 'iwl_title, iwl_from' );
  94                         }
  95                 } else {
  96                         $this->addOption( 'ORDER BY', 'iwl_prefix, iwl_title, iwl_from' );
  97                 }
  98
  99                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 100
 101                 $res = $this->select( __METHOD__ );
 102
 103                 $pages = array();
 104
 105                 $count = 0;
 106                 $result = $this->getResult();
 107                 foreach ( $res as $row ) {
 108                         if ( ++ $count > $params['limit'] ) {
 109                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 110                                 // Continue string preserved in case the redirect query doesn't pass the limit
 111                                 $this->setContinueEnumParameter( 'continue', "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}" );
 112                                 break;
 113                         }
 114
 115                         if ( !is_null( $resultPageSet ) ) {
 116                                 $pages[] = Title::newFromRow( $row );
 117                         } else {
 118                                 $entry = array();
 119
 120                                 $entry['pageid'] = intval( $row->page_id );
 121                                 $entry['ns'] = intval( $row->page_namespace );
 122                                 $entry['title'] = $row->page_title;
 123
 124                                 if ( $row->page_is_redirect ) {
 125                                         $entry['redirect'] = '';
 126                                 }
 127
 128                                 if ( $iwprefix ) {
 129                                         $entry['iwprefix'] = $row->iwl_prefix;
 130                                 }
 131
 132                                 if ( $iwtitle ) {
 133                                         $entry['iwtitle'] = $row->iwl_title;
 134                                 }
 135
 136                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $entry );
 137                                 if ( !$fit ) {
 138                                         $this->setContinueEnumParameter( 'continue', "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}" );
 139                                         break;
 140                                 }
 141                         }
 142                 }
 143
 144                 if ( is_null( $resultPageSet ) ) {
 145                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'iw' );
 146                 } else {
 147                         $resultPageSet->populateFromTitles( $pages );
 148                 }
 149         }
 150
 151         public function getCacheMode( $params ) {
 152                 return 'public';
 153         }
 154
 155         public function getAllowedParams() {
 156                 return array(
 157                         'prefix' => null,
 158                         'title' => null,
 159                         'continue' => null,
 160                         'limit' => array(
 161                                 ApiBase::PARAM_DFLT => 10,
 162                                 ApiBase::PARAM_TYPE => 'limit',
 163                                 ApiBase::PARAM_MIN => 1,
 164                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 165                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 166                         ),
 167                         'prop' => array(
 168                                 ApiBase::PARAM_ISMULTI => true,
 169                                 ApiBase::PARAM_DFLT => '',
 170                                 ApiBase::PARAM_TYPE => array(
 171                                         'iwprefix',
 172                                         'iwtitle',
 173                                 ),
 174                         ),
 175                 );
 176         }
 177
 178         public function getParamDescription() {
 179                 return array(
 180                         'prefix' => 'Prefix for the interwiki',
 181                         'title' => "Interwiki link to search for. Must be used with {$this->getModulePrefix()}prefix",
 182                         'continue' => 'When more results are available, use this to continue',
 183                         'prop' => array(
 184                                 'Which properties to get',
 185                                 ' iwprefix       - Adds the prefix of the interwiki',
 186                                 ' iwtitle        - Adds the title of the interwiki',
 187                         ),
 188                         'limit' => 'How many total pages to return',
 189                 );
 190         }
 191
 192         public function getDescription() {
 193                 return array( 'Find all pages that link to the given interwiki link.',
 194                         'Can be used to find all links with a prefix, or',
 195                         'all links to a title (with a given prefix).',
 196                         'Using neither parameter is effectively "All IW Links"',
 197                 );
 198         }
 199
 200         public function getPossibleErrors() {
 201                 return array_merge( parent::getPossibleErrors(), array(
 202                         array( 'missingparam', 'prefix' ),
 203                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 204                 ) );
 205         }
 206
 207         protected function getExamples() {
 208                 return array(
 209                         'api.php?action=query&list=iwbacklinks&iwbltitle=Test&iwblprefix=wikibooks',
 210                         'api.php?action=query&generator=iwbacklinks&giwbltitle=Test&iwblprefix=wikibooks&prop=info'
 211                 );
 212         }
 213
 214         public function getVersion() {
 215                 return __CLASS__ . ': $Id$';
 216         }
 217 }