includes/api/ApiQueryAllLinks.php

   1 <?php
   2
   3 /*
   4  * Created on July 7, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 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  * Query module to enumerate links from all pages together.
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  37
  38         public function __construct($query, $moduleName) {
  39                 parent :: __construct($query, $moduleName, 'al');
  40         }
  41
  42         public function execute() {
  43                 $this->run();
  44         }
  45
  46         public function executeGenerator($resultPageSet) {
  47                 $this->run($resultPageSet);
  48         }
  49
  50         private function run($resultPageSet = null) {
  51
  52                 $db = $this->getDB();
  53                 $params = $this->extractRequestParams();
  54
  55                 $prop = array_flip($params['prop']);
  56                 $fld_ids = isset($prop['ids']);
  57                 $fld_title = isset($prop['title']);
  58
  59                 if ($params['unique']) {
  60                         if (!is_null($resultPageSet))
  61                                 $this->dieUsage($this->getModuleName() . ' cannot be used as a generator in unique links mode', 'params');
  62                         if ($fld_ids)
  63                                 $this->dieUsage($this->getModuleName() . ' cannot return corresponding page ids in unique links mode', 'params');
  64                         $this->addOption('DISTINCT');
  65                 }
  66
  67                 $this->addTables('pagelinks');
  68                 $this->addWhereFld('pl_namespace', $params['namespace']);
  69
  70                 if (!is_null($params['from']) && !is_null($params['continue']))
  71                         $this->dieUsage('alcontinue and alfrom cannot be used together', 'params');
  72                 if (!is_null($params['continue']))
  73                 {
  74                         $arr = explode('|', $params['continue']);
  75                         if(count($arr) != 2)
  76                                 $this->dieUsage("Invalid continue parameter", 'badcontinue');
  77                         $from = $this->getDB()->strencode($this->titleToKey($arr[0]));
  78                         $id = intval($arr[1]);
  79                         $this->addWhere("pl_title > '$from' OR " .
  80                                         "(pl_title = '$from' AND " .
  81                                         "pl_from > $id)");
  82                 }
  83
  84                 if (!is_null($params['from']))
  85                         $this->addWhere('pl_title>=' . $db->addQuotes($this->titlePartToKey($params['from'])));
  86                 if (isset ($params['prefix']))
  87                         $this->addWhere('pl_title' . $db->buildLike( $this->titlePartToKey($params['prefix']), $db->anyString() ) );
  88
  89                 $this->addFields(array (
  90                         'pl_title',
  91                 ));
  92                 $this->addFieldsIf('pl_from', !$params['unique']);
  93
  94                 $this->addOption('USE INDEX', 'pl_namespace');
  95                 $limit = $params['limit'];
  96                 $this->addOption('LIMIT', $limit+1);
  97                 if($params['unique'])
  98                         $this->addOption('ORDER BY', 'pl_title');
  99                 else
 100                         $this->addOption('ORDER BY', 'pl_title, pl_from');
 101
 102                 $res = $this->select(__METHOD__);
 103
 104                 $pageids = array ();
 105                 $count = 0;
 106                 $result = $this->getResult();
 107                 while ($row = $db->fetchObject($res)) {
 108                         if (++ $count > $limit) {
 109                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 110                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 111                                 if($params['unique'])
 112                                         $this->setContinueEnumParameter('from', $this->keyToTitle($row->pl_title));
 113                                 else
 114                                         $this->setContinueEnumParameter('continue', $this->keyToTitle($row->pl_title) . "|" . $row->pl_from);
 115                                 break;
 116                         }
 117
 118                         if (is_null($resultPageSet)) {
 119                                 $vals = array();
 120                                 if ($fld_ids)
 121                                         $vals['fromid'] = intval($row->pl_from);
 122                                 if ($fld_title) {
 123                                         $title = Title :: makeTitle($params['namespace'], $row->pl_title);
 124                                         ApiQueryBase::addTitleInfo($vals, $title);
 125                                 }
 126                                 $fit = $result->addValue(array('query', $this->getModuleName()), null, $vals);
 127                                 if(!$fit)
 128                                 {
 129                                         if($params['unique'])
 130                                                 $this->setContinueEnumParameter('from', $this->keyToTitle($row->pl_title));
 131                                         else
 132                                                 $this->setContinueEnumParameter('continue', $this->keyToTitle($row->pl_title) . "|" . $row->pl_from);
 133                                         break;
 134                                 }
 135                         } else {
 136                                 $pageids[] = $row->pl_from;
 137                         }
 138                 }
 139                 $db->freeResult($res);
 140
 141                 if (is_null($resultPageSet)) {
 142                         $result->setIndexedTagName_internal(array('query', $this->getModuleName()), 'l');
 143                 } else {
 144                         $resultPageSet->populateFromPageIDs($pageids);
 145                 }
 146         }
 147
 148         public function getAllowedParams() {
 149                 return array (
 150                         'continue' => null,
 151                         'from' => null,
 152                         'prefix' => null,
 153                         'unique' => false,
 154                         'prop' => array (
 155                                 ApiBase :: PARAM_ISMULTI => true,
 156                                 ApiBase :: PARAM_DFLT => 'title',
 157                                 ApiBase :: PARAM_TYPE => array (
 158                                         'ids',
 159                                         'title'
 160                                 )
 161                         ),
 162                         'namespace' => array (
 163                                 ApiBase :: PARAM_DFLT => 0,
 164                                 ApiBase :: PARAM_TYPE => 'namespace'
 165                         ),
 166                         'limit' => array (
 167                                 ApiBase :: PARAM_DFLT => 10,
 168                                 ApiBase :: PARAM_TYPE => 'limit',
 169                                 ApiBase :: PARAM_MIN => 1,
 170                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 171                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 172                         )
 173                 );
 174         }
 175
 176         public function getParamDescription() {
 177                 return array (
 178                         'from' => 'The page title to start enumerating from.',
 179                         'prefix' => 'Search for all page titles that begin with this value.',
 180                         'unique' => 'Only show unique links. Cannot be used with generator or prop=ids',
 181                         'prop' => 'What pieces of information to include',
 182                         'namespace' => 'The namespace to enumerate.',
 183                         'limit' => 'How many total links to return.',
 184                         'continue' => 'When more results are available, use this to continue.',
 185                 );
 186         }
 187
 188         public function getDescription() {
 189                 return 'Enumerate all links that point to a given namespace';
 190         }
 191
 192         protected function getExamples() {
 193                 return array (
 194                         'api.php?action=query&list=alllinks&alunique&alfrom=B',
 195                 );
 196         }
 197
 198         public function getVersion() {
 199                 return __CLASS__ . ': $Id$';
 200         }
 201 }