includes/api/ApiQueryAllLinks.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on July 7, 2007
   6  *
   7  * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * Query module to enumerate links from all pages together.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'al' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function getCacheMode( $params ) {
  43                 return 'public';
  44         }
  45
  46         public function executeGenerator( $resultPageSet ) {
  47                 $this->run( $resultPageSet );
  48         }
  49
  50         /**
  51          * @param $resultPageSet ApiPageSet
  52          */
  53         private function run( $resultPageSet = null ) {
  54                 $db = $this->getDB();
  55                 $params = $this->extractRequestParams();
  56
  57                 $prop = array_flip( $params['prop'] );
  58                 $fld_ids = isset( $prop['ids'] );
  59                 $fld_title = isset( $prop['title'] );
  60
  61                 if ( $params['unique'] ) {
  62                         if ( !is_null( $resultPageSet ) ) {
  63                                 $this->dieUsage( $this->getModuleName() . ' cannot be used as a generator in unique links mode', 'params' );
  64                         }
  65                         if ( $fld_ids ) {
  66                                 $this->dieUsage( $this->getModuleName() . ' cannot return corresponding page ids in unique links mode', 'params' );
  67                         }
  68                         $this->addOption( 'DISTINCT' );
  69                 }
  70
  71                 $this->addTables( 'pagelinks' );
  72                 $this->addWhereFld( 'pl_namespace', $params['namespace'] );
  73
  74                 if ( !is_null( $params['from'] ) && !is_null( $params['continue'] ) ) {
  75                         $this->dieUsage( 'alcontinue and alfrom cannot be used together', 'params' );
  76                 }
  77                 if ( !is_null( $params['continue'] ) ) {
  78                         $arr = explode( '|', $params['continue'] );
  79                         if ( count( $arr ) != 2 ) {
  80                                 $this->dieUsage( 'Invalid continue parameter', 'badcontinue' );
  81                         }
  82                         $from = $this->getDB()->strencode( $this->titleToKey( $arr[0] ) );
  83                         $id = intval( $arr[1] );
  84                         $this->addWhere(
  85                                 "pl_title > '$from' OR " .
  86                                 "(pl_title = '$from' AND " .
  87                                 "pl_from > $id)"
  88                         );
  89                 }
  90
  91                 $from = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
  92                 $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
  93                 $this->addWhereRange( 'pl_title', 'newer', $from, $to );
  94
  95                 if ( isset( $params['prefix'] ) ) {
  96                         $this->addWhere( 'pl_title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
  97                 }
  98
  99                 $this->addFields( 'pl_title' );
 100                 $this->addFieldsIf( 'pl_from', !$params['unique'] );
 101
 102                 $this->addOption( 'USE INDEX', 'pl_namespace' );
 103                 $limit = $params['limit'];
 104                 $this->addOption( 'LIMIT', $limit + 1 );
 105
 106                 if ( !$params['unique'] ) {
 107                         $this->addOption( 'ORDER BY', 'pl_title, pl_from' );
 108                 }
 109
 110                 $res = $this->select( __METHOD__ );
 111
 112                 $pageids = array();
 113                 $count = 0;
 114                 $result = $this->getResult();
 115                 foreach ( $res as $row ) {
 116                         if ( ++ $count > $limit ) {
 117                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 118                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 119                                 if ( $params['unique'] ) {
 120                                         $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->pl_title ) );
 121                                 } else {
 122                                         $this->setContinueEnumParameter( 'continue', $this->keyToTitle( $row->pl_title ) . "|" . $row->pl_from );
 123                                 }
 124                                 break;
 125                         }
 126
 127                         if ( is_null( $resultPageSet ) ) {
 128                                 $vals = array();
 129                                 if ( $fld_ids ) {
 130                                         $vals['fromid'] = intval( $row->pl_from );
 131                                 }
 132                                 if ( $fld_title ) {
 133                                         $title = Title::makeTitle( $params['namespace'], $row->pl_title );
 134                                         ApiQueryBase::addTitleInfo( $vals, $title );
 135                                 }
 136                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 137                                 if ( !$fit ) {
 138                                         if ( $params['unique'] ) {
 139                                                 $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->pl_title ) );
 140                                         } else {
 141                                                 $this->setContinueEnumParameter( 'continue', $this->keyToTitle( $row->pl_title ) . "|" . $row->pl_from );
 142                                         }
 143                                         break;
 144                                 }
 145                         } else {
 146                                 $pageids[] = $row->pl_from;
 147                         }
 148                 }
 149
 150                 if ( is_null( $resultPageSet ) ) {
 151                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'l' );
 152                 } else {
 153                         $resultPageSet->populateFromPageIDs( $pageids );
 154                 }
 155         }
 156
 157         public function getAllowedParams() {
 158                 return array(
 159                         'continue' => null,
 160                         'from' => null,
 161                         'to' => null,
 162                         'prefix' => null,
 163                         'unique' => false,
 164                         'prop' => array(
 165                                 ApiBase::PARAM_ISMULTI => true,
 166                                 ApiBase::PARAM_DFLT => 'title',
 167                                 ApiBase::PARAM_TYPE => array(
 168                                         'ids',
 169                                         'title'
 170                                 )
 171                         ),
 172                         'namespace' => array(
 173                                 ApiBase::PARAM_DFLT => 0,
 174                                 ApiBase::PARAM_TYPE => 'namespace'
 175                         ),
 176                         'limit' => array(
 177                                 ApiBase::PARAM_DFLT => 10,
 178                                 ApiBase::PARAM_TYPE => 'limit',
 179                                 ApiBase::PARAM_MIN => 1,
 180                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 181                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 182                         )
 183                 );
 184         }
 185
 186         public function getParamDescription() {
 187                 $p = $this->getModulePrefix();
 188                 return array(
 189                         'from' => 'The page title to start enumerating from',
 190                         'to' => 'The page title to stop enumerating at',
 191                         'prefix' => 'Search for all page titles that begin with this value',
 192                         'unique' => "Only show unique links. Cannot be used with generator or {$p}prop=ids",
 193                         'prop' => array(
 194                                 'What pieces of information to include',
 195                                 " ids    - Adds pageid of where the link is from (Cannot be used with {$p}unique)",
 196                                 ' title  - Adds the title of the link',
 197                         ),
 198                         'namespace' => 'The namespace to enumerate',
 199                         'limit' => 'How many total links to return',
 200                         'continue' => 'When more results are available, use this to continue',
 201                 );
 202         }
 203
 204         public function getDescription() {
 205                 return 'Enumerate all links that point to a given namespace';
 206         }
 207
 208         public function getPossibleErrors() {
 209                 $m = $this->getModuleName();
 210                 return array_merge( parent::getPossibleErrors(), array(
 211                         array( 'code' => 'params', 'info' => "{$m} cannot be used as a generator in unique links mode" ),
 212                         array( 'code' => 'params', 'info' => "{$m} cannot return corresponding page ids in unique links mode" ),
 213                         array( 'code' => 'params', 'info' => 'alcontinue and alfrom cannot be used together' ),
 214                         array( 'code' => 'badcontinue', 'info' => 'Invalid continue parameter' ),
 215                 ) );
 216         }
 217
 218         public function getExamples() {
 219                 return array(
 220                         'api.php?action=query&list=alllinks&alunique=&alfrom=B',
 221                 );
 222         }
 223
 224         public function getHelpUrls() {
 225                 return 'https://www.mediawiki.org/wiki/API:Alllinks';
 226         }
 227
 228         public function getVersion() {
 229                 return __CLASS__ . ': $Id$';
 230         }
 231 }