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 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * Query module to enumerate links from all pages together.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'al' );
  41         }
  42
  43         public function execute() {
  44                 $this->run();
  45         }
  46
  47         public function getCacheMode( $params ) {
  48                 return 'public';
  49         }
  50
  51         public function executeGenerator( $resultPageSet ) {
  52                 $this->run( $resultPageSet );
  53         }
  54
  55         private function run( $resultPageSet = null ) {
  56                 $db = $this->getDB();
  57                 $params = $this->extractRequestParams();
  58
  59                 $prop = array_flip( $params['prop'] );
  60                 $fld_ids = isset( $prop['ids'] );
  61                 $fld_title = isset( $prop['title'] );
  62
  63                 if ( $params['unique'] ) {
  64                         if ( !is_null( $resultPageSet ) ) {
  65                                 $this->dieUsage( $this->getModuleName() . ' cannot be used as a generator in unique links mode', 'params' );
  66                         }
  67                         if ( $fld_ids ) {
  68                                 $this->dieUsage( $this->getModuleName() . ' cannot return corresponding page ids in unique links mode', 'params' );
  69                         }
  70                         $this->addOption( 'DISTINCT' );
  71                 }
  72
  73                 $this->addTables( 'pagelinks' );
  74                 $this->addWhereFld( 'pl_namespace', $params['namespace'] );
  75
  76                 if ( !is_null( $params['from'] ) && !is_null( $params['continue'] ) ) {
  77                         $this->dieUsage( 'alcontinue and alfrom cannot be used together', 'params' );
  78                 }
  79                 if ( !is_null( $params['continue'] ) ) {
  80                         $arr = explode( '|', $params['continue'] );
  81                         if ( count( $arr ) != 2 ) {
  82                                 $this->dieUsage( 'Invalid continue parameter', 'badcontinue' );
  83                         }
  84                         $from = $this->getDB()->strencode( $this->titleToKey( $arr[0] ) );
  85                         $id = intval( $arr[1] );
  86                         $this->addWhere(
  87                                 "pl_title > '$from' OR " .
  88                                 "(pl_title = '$from' AND " .
  89                                 "pl_from > $id)"
  90                         );
  91                 }
  92
  93                 if ( !is_null( $params['from'] ) ) {
  94                         $this->addWhere( 'pl_title>=' . $db->addQuotes( $this->titlePartToKey( $params['from'] ) ) );
  95                 }
  96                 if ( !is_null( $params['to'] ) ) {
  97                         $this->addWhere( 'pl_title<=' . $db->addQuotes( $this->titlePartToKey( $params['to'] ) ) );
  98                 }
  99                 if ( isset( $params['prefix'] ) ) {
 100                         $this->addWhere( 'pl_title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
 101                 }
 102
 103                 $this->addFields( array(
 104                         'pl_title',
 105                 ) );
 106                 $this->addFieldsIf( 'pl_from', !$params['unique'] );
 107
 108                 $this->addOption( 'USE INDEX', 'pl_namespace' );
 109                 $limit = $params['limit'];
 110                 $this->addOption( 'LIMIT', $limit + 1 );
 111                 if ( $params['unique'] ) {
 112                         $this->addOption( 'ORDER BY', 'pl_title' );
 113                 } else {
 114                         $this->addOption( 'ORDER BY', 'pl_title, pl_from' );
 115                 }
 116
 117                 $res = $this->select( __METHOD__ );
 118
 119                 $pageids = array();
 120                 $count = 0;
 121                 $result = $this->getResult();
 122                 foreach ( $res as $row ) {
 123                         if ( ++ $count > $limit ) {
 124                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 125                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 126                                 if ( $params['unique'] ) {
 127                                         $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->pl_title ) );
 128                                 } else {
 129                                         $this->setContinueEnumParameter( 'continue', $this->keyToTitle( $row->pl_title ) . "|" . $row->pl_from );
 130                                 }
 131                                 break;
 132                         }
 133
 134                         if ( is_null( $resultPageSet ) ) {
 135                                 $vals = array();
 136                                 if ( $fld_ids ) {
 137                                         $vals['fromid'] = intval( $row->pl_from );
 138                                 }
 139                                 if ( $fld_title ) {
 140                                         $title = Title::makeTitle( $params['namespace'], $row->pl_title );
 141                                         ApiQueryBase::addTitleInfo( $vals, $title );
 142                                 }
 143                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 144                                 if ( !$fit ) {
 145                                         if ( $params['unique'] ) {
 146                                                 $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->pl_title ) );
 147                                         } else {
 148                                                 $this->setContinueEnumParameter( 'continue', $this->keyToTitle( $row->pl_title ) . "|" . $row->pl_from );
 149                                         }
 150                                         break;
 151                                 }
 152                         } else {
 153                                 $pageids[] = $row->pl_from;
 154                         }
 155                 }
 156
 157                 if ( is_null( $resultPageSet ) ) {
 158                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'l' );
 159                 } else {
 160                         $resultPageSet->populateFromPageIDs( $pageids );
 161                 }
 162         }
 163
 164         public function getAllowedParams() {
 165                 return array(
 166                         'continue' => null,
 167                         'from' => null,
 168                         'to' => null,
 169                         'prefix' => null,
 170                         'unique' => false,
 171                         'prop' => array(
 172                                 ApiBase::PARAM_ISMULTI => true,
 173                                 ApiBase::PARAM_DFLT => 'title',
 174                                 ApiBase::PARAM_TYPE => array(
 175                                         'ids',
 176                                         'title'
 177                                 )
 178                         ),
 179                         'namespace' => array(
 180                                 ApiBase::PARAM_DFLT => 0,
 181                                 ApiBase::PARAM_TYPE => 'namespace'
 182                         ),
 183                         'limit' => array(
 184                                 ApiBase::PARAM_DFLT => 10,
 185                                 ApiBase::PARAM_TYPE => 'limit',
 186                                 ApiBase::PARAM_MIN => 1,
 187                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 188                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 189                         )
 190                 );
 191         }
 192
 193         public function getParamDescription() {
 194                 $p = $this->getModulePrefix();
 195                 return array(
 196                         'from' => 'The page title to start enumerating from',
 197                         'to' => 'The page title to stop enumerating at',
 198                         'prefix' => 'Search for all page titles that begin with this value',
 199                         'unique' => "Only show unique links. Cannot be used with generator or {$p}prop=ids",
 200                         'prop' => array(
 201                                 'What pieces of information to include',
 202                                 " ids    - Adds pageid of where the link is from (Cannot be used with {$p}unique)",
 203                                 ' title  - Adds the title of the link',
 204                         ),
 205                         'namespace' => 'The namespace to enumerate',
 206                         'limit' => 'How many total links to return',
 207                         'continue' => 'When more results are available, use this to continue',
 208                 );
 209         }
 210
 211         public function getDescription() {
 212                 return 'Enumerate all links that point to a given namespace';
 213         }
 214
 215         public function getPossibleErrors() {
 216                 $m = $this->getModuleName();
 217                 return array_merge( parent::getPossibleErrors(), array(
 218                         array( 'code' => 'params', 'info' => "{$m} cannot be used as a generator in unique links mode" ),
 219                         array( 'code' => 'params', 'info' => "{$m} cannot return corresponding page ids in unique links mode" ),
 220                         array( 'code' => 'params', 'info' => 'alcontinue and alfrom cannot be used together' ),
 221                         array( 'code' => 'badcontinue', 'info' => 'Invalid continue parameter' ),
 222                 ) );
 223         }
 224
 225         protected function getExamples() {
 226                 return array(
 227                         'api.php?action=query&list=alllinks&alunique=&alfrom=B',
 228                 );
 229         }
 230
 231         public function getVersion() {
 232                 return __CLASS__ . ': $Id$';
 233         }
 234 }