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 /**
  29  * This gives links pointing to the given interwiki
  30  * @ingroup API
  31  */
  32 class ApiQueryIWBacklinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'iwbl' );
  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['prefix'] ) ) {
  54                         $this->dieUsageMsg( array( 'missingparam', 'prefix' ) );
  55                 }
  56
  57                 if ( !is_null( $params['continue'] ) ) {
  58                         $cont = explode( '|', $params['continue'] );
  59                         $this->dieContinueUsageIf( count( $cont ) != 3 );
  60
  61                         $db = $this->getDB();
  62                         $op = $params['dir'] == 'descending' ? '<' : '>';
  63                         $prefix = $db->addQuotes( $cont[0] );
  64                         $title = $db->addQuotes( $cont[1] );
  65                         $from = intval( $cont[2] );
  66                         $this->addWhere(
  67                                 "iwl_prefix $op $prefix OR " .
  68                                 "(iwl_prefix = $prefix AND " .
  69                                 "(iwl_title $op $title OR " .
  70                                 "(iwl_title = $title AND " .
  71                                 "iwl_from $op= $from)))"
  72                         );
  73                 }
  74
  75                 $prop = array_flip( $params['prop'] );
  76                 $iwprefix = isset( $prop['iwprefix'] );
  77                 $iwtitle = isset( $prop['iwtitle'] );
  78
  79                 $this->addTables( array( 'iwlinks', 'page' ) );
  80                 $this->addWhere( 'iwl_from = page_id' );
  81
  82                 $this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect',
  83                         'iwl_from', 'iwl_prefix', 'iwl_title' ) );
  84
  85                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  86                 if ( isset( $params['prefix'] ) ) {
  87                         $this->addWhereFld( 'iwl_prefix', $params['prefix'] );
  88                         if ( isset( $params['title'] ) ) {
  89                                 $this->addWhereFld( 'iwl_title', $params['title'] );
  90                                 $this->addOption( 'ORDER BY', 'iwl_from' . $sort );
  91                         } else {
  92                                 $this->addOption( 'ORDER BY', array(
  93                                         'iwl_title' . $sort,
  94                                         'iwl_from' . $sort
  95                                 ) );
  96                         }
  97                 } else {
  98                         $this->addOption( 'ORDER BY', array(
  99                                 'iwl_prefix' . $sort,
 100                                 'iwl_title' . $sort,
 101                                 'iwl_from' . $sort
 102                         ) );
 103                 }
 104
 105                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 106
 107                 $res = $this->select( __METHOD__ );
 108
 109                 $pages = array();
 110
 111                 $count = 0;
 112                 $result = $this->getResult();
 113                 foreach ( $res as $row ) {
 114                         if ( ++$count > $params['limit'] ) {
 115                                 // We've reached the one extra which shows that there are
 116                                 // additional pages to be had. Stop here...
 117                                 // Continue string preserved in case the redirect query doesn't
 118                                 // pass the limit
 119                                 $this->setContinueEnumParameter(
 120                                         'continue',
 121                                         "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
 122                                 );
 123                                 break;
 124                         }
 125
 126                         if ( !is_null( $resultPageSet ) ) {
 127                                 $pages[] = Title::newFromRow( $row );
 128                         } else {
 129                                 $entry = array( 'pageid' => $row->page_id );
 130
 131                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 132                                 ApiQueryBase::addTitleInfo( $entry, $title );
 133
 134                                 if ( $row->page_is_redirect ) {
 135                                         $entry['redirect'] = '';
 136                                 }
 137
 138                                 if ( $iwprefix ) {
 139                                         $entry['iwprefix'] = $row->iwl_prefix;
 140                                 }
 141
 142                                 if ( $iwtitle ) {
 143                                         $entry['iwtitle'] = $row->iwl_title;
 144                                 }
 145
 146                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $entry );
 147                                 if ( !$fit ) {
 148                                         $this->setContinueEnumParameter(
 149                                                 'continue',
 150                                                 "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
 151                                         );
 152                                         break;
 153                                 }
 154                         }
 155                 }
 156
 157                 if ( is_null( $resultPageSet ) ) {
 158                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'iw' );
 159                 } else {
 160                         $resultPageSet->populateFromTitles( $pages );
 161                 }
 162         }
 163
 164         public function getCacheMode( $params ) {
 165                 return 'public';
 166         }
 167
 168         public function getAllowedParams() {
 169                 return array(
 170                         'prefix' => null,
 171                         'title' => null,
 172                         'continue' => null,
 173                         'limit' => array(
 174                                 ApiBase::PARAM_DFLT => 10,
 175                                 ApiBase::PARAM_TYPE => 'limit',
 176                                 ApiBase::PARAM_MIN => 1,
 177                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 178                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 179                         ),
 180                         'prop' => array(
 181                                 ApiBase::PARAM_ISMULTI => true,
 182                                 ApiBase::PARAM_DFLT => '',
 183                                 ApiBase::PARAM_TYPE => array(
 184                                         'iwprefix',
 185                                         'iwtitle',
 186                                 ),
 187                         ),
 188                         'dir' => array(
 189                                 ApiBase::PARAM_DFLT => 'ascending',
 190                                 ApiBase::PARAM_TYPE => array(
 191                                         'ascending',
 192                                         'descending'
 193                                 )
 194                         ),
 195                 );
 196         }
 197
 198         public function getParamDescription() {
 199                 return array(
 200                         'prefix' => 'Prefix for the interwiki',
 201                         'title' => "Interwiki link to search for. Must be used with {$this->getModulePrefix()}prefix",
 202                         'continue' => 'When more results are available, use this to continue',
 203                         'prop' => array(
 204                                 'Which properties to get',
 205                                 ' iwprefix       - Adds the prefix of the interwiki',
 206                                 ' iwtitle        - Adds the title of the interwiki',
 207                         ),
 208                         'limit' => 'How many total pages to return',
 209                         'dir' => 'The direction in which to list',
 210                 );
 211         }
 212
 213         public function getResultProperties() {
 214                 return array(
 215                         '' => array(
 216                                 'pageid' => 'integer',
 217                                 'ns' => 'namespace',
 218                                 'title' => 'string',
 219                                 'redirect' => 'boolean'
 220                         ),
 221                         'iwprefix' => array(
 222                                 'iwprefix' => 'string'
 223                         ),
 224                         'iwtitle' => array(
 225                                 'iwtitle' => 'string'
 226                         )
 227                 );
 228         }
 229
 230         public function getDescription() {
 231                 return array( 'Find all pages that link to the given interwiki link.',
 232                         'Can be used to find all links with a prefix, or',
 233                         'all links to a title (with a given prefix).',
 234                         'Using neither parameter is effectively "All IW Links".',
 235                 );
 236         }
 237
 238         public function getPossibleErrors() {
 239                 return array_merge( parent::getPossibleErrors(), array(
 240                         array( 'missingparam', 'prefix' ),
 241                 ) );
 242         }
 243
 244         public function getExamples() {
 245                 return array(
 246                         'api.php?action=query&list=iwbacklinks&iwbltitle=Test&iwblprefix=wikibooks',
 247                         'api.php?action=query&generator=iwbacklinks&giwbltitle=Test&giwblprefix=wikibooks&prop=info'
 248                 );
 249         }
 250
 251         public function getHelpUrls() {
 252                 return 'https://www.mediawiki.org/wiki/API:Iwbacklinks';
 253         }
 254 }