includes/api/ApiQueryExtLinksUsage.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  * @ingroup API
  33  */
  34 class ApiQueryExtLinksUsage extends ApiQueryGeneratorBase {
  35
  36         public function __construct( $query, $moduleName ) {
  37                 parent :: __construct( $query, $moduleName, 'eu' );
  38         }
  39
  40         public function execute() {
  41                 $this->run();
  42         }
  43
  44         public function executeGenerator( $resultPageSet ) {
  45                 $this->run( $resultPageSet );
  46         }
  47
  48         private function run( $resultPageSet = null ) {
  49
  50                 $params = $this->extractRequestParams();
  51
  52                 $protocol = $params['protocol'];
  53                 $query = $params['query'];
  54
  55                 // Find the right prefix
  56                 global $wgUrlProtocols;
  57                 if ( $protocol && !in_array( $protocol, $wgUrlProtocols ) )
  58                 {
  59                         foreach ( $wgUrlProtocols as $p ) {
  60                                 if ( substr( $p, 0, strlen( $protocol ) ) === $protocol ) {
  61                                         $protocol = $p;
  62                                         break;
  63                                 }
  64                         }
  65                 }
  66                 else
  67                         $protocol = null;
  68
  69                 $db = $this->getDB();
  70                 $this->addTables( array( 'page', 'externallinks' ) );   // must be in this order for 'USE INDEX'
  71                 $this->addOption( 'USE INDEX', 'el_index' );
  72                 $this->addWhere( 'page_id=el_from' );
  73                 $this->addWhereFld( 'page_namespace', $params['namespace'] );
  74
  75                 if ( !is_null( $query ) || $query != '' )
  76                 {
  77                         if ( is_null( $protocol ) )
  78                                 $protocol = 'http://';
  79
  80                         $likeQuery = LinkFilter::makeLikeArray( $query, $protocol );
  81                         if ( !$likeQuery )
  82                                 $this->dieUsage( 'Invalid query', 'bad_query' );
  83
  84                         $likeQuery = LinkFilter::keepOneWildcard( $likeQuery );
  85                         $this->addWhere( 'el_index ' . $db->buildLike( $likeQuery ) );
  86                 }
  87                 else if ( !is_null( $protocol ) )
  88                         $this->addWhere( 'el_index ' . $db->buildLike( "$protocol", $db->anyString() ) );
  89
  90                 $prop = array_flip( $params['prop'] );
  91                 $fld_ids = isset( $prop['ids'] );
  92                 $fld_title = isset( $prop['title'] );
  93                 $fld_url = isset( $prop['url'] );
  94
  95                 if ( is_null( $resultPageSet ) ) {
  96                         $this->addFields( array (
  97                                 'page_id',
  98                                 'page_namespace',
  99                                 'page_title'
 100                         ) );
 101                         $this->addFieldsIf( 'el_to', $fld_url );
 102                 } else {
 103                         $this->addFields( $resultPageSet->getPageTableFields() );
 104                 }
 105
 106                 $limit = $params['limit'];
 107                 $offset = $params['offset'];
 108                 $this->addOption( 'LIMIT', $limit + 1 );
 109                 if ( isset ( $offset ) )
 110                         $this->addOption( 'OFFSET', $offset );
 111
 112                 $res = $this->select( __METHOD__ );
 113
 114                 $result = $this->getResult();
 115                 $count = 0;
 116                 while ( $row = $db->fetchObject( $res ) ) {
 117                         if ( ++ $count > $limit ) {
 118                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 119                                 $this->setContinueEnumParameter( 'offset', $offset + $limit );
 120                                 break;
 121                         }
 122
 123                         if ( is_null( $resultPageSet ) ) {
 124                                 $vals = array();
 125                                 if ( $fld_ids )
 126                                         $vals['pageid'] = intval( $row->page_id );
 127                                 if ( $fld_title ) {
 128                                         $title = Title :: makeTitle( $row->page_namespace, $row->page_title );
 129                                         ApiQueryBase::addTitleInfo( $vals, $title );
 130                                 }
 131                                 if ( $fld_url )
 132                                         $vals['url'] = $row->el_to;
 133                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 134                                 if ( !$fit )
 135                                 {
 136                                         $this->setContinueEnumParameter( 'offset', $offset + $count - 1 );
 137                                         break;
 138                                 }
 139                         } else {
 140                                 $resultPageSet->processDbRow( $row );
 141                         }
 142                 }
 143                 $db->freeResult( $res );
 144
 145                 if ( is_null( $resultPageSet ) ) {
 146                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ),
 147                                         $this->getModulePrefix() );
 148                 }
 149         }
 150
 151         public function getAllowedParams() {
 152                 global $wgUrlProtocols;
 153                 $protocols = array( '' );
 154                 foreach ( $wgUrlProtocols as $p ) {
 155                         $protocols[] = substr( $p, 0, strpos( $p, ':' ) );
 156                 }
 157
 158                 return array (
 159                         'prop' => array (
 160                                 ApiBase :: PARAM_ISMULTI => true,
 161                                 ApiBase :: PARAM_DFLT => 'ids|title|url',
 162                                 ApiBase :: PARAM_TYPE => array (
 163                                         'ids',
 164                                         'title',
 165                                         'url'
 166                                 )
 167                         ),
 168                         'offset' => array (
 169                                 ApiBase :: PARAM_TYPE => 'integer'
 170                         ),
 171                         'protocol' => array (
 172                                 ApiBase :: PARAM_TYPE => $protocols,
 173                                 ApiBase :: PARAM_DFLT => '',
 174                         ),
 175                         'query' => null,
 176                         'namespace' => array (
 177                                 ApiBase :: PARAM_ISMULTI => true,
 178                                 ApiBase :: PARAM_TYPE => 'namespace'
 179                         ),
 180                         'limit' => array (
 181                                 ApiBase :: PARAM_DFLT => 10,
 182                                 ApiBase :: PARAM_TYPE => 'limit',
 183                                 ApiBase :: PARAM_MIN => 1,
 184                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 185                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 186                         )
 187                 );
 188         }
 189
 190         public function getParamDescription() {
 191                 return array (
 192                         'prop' => 'What pieces of information to include',
 193                         'offset' => 'Used for paging. Use the value returned for "continue"',
 194                         'protocol' => array(    'Protocol of the url. If empty and euquery set, the protocol is http.',
 195                                                 'Leave both this and euquery empty to list all external links' ),
 196                         'query' => 'Search string without protocol. See [[Special:LinkSearch]]. Leave empty to list all external links',
 197                         'namespace' => 'The page namespace(s) to enumerate.',
 198                         'limit' => 'How many pages to return.'
 199                 );
 200         }
 201
 202         public function getDescription() {
 203                 return 'Enumerate pages that contain a given URL';
 204         }
 205
 206         public function getPossibleErrors() {
 207                 return array_merge( parent::getPossibleErrors(), array(
 208                         array( 'code' => 'bad_query', 'info' => 'Invalid query' ),
 209                 ) );
 210         }
 211
 212         protected function getExamples() {
 213                 return array (
 214                         'api.php?action=query&list=exturlusage&euquery=www.mediawiki.org'
 215                 );
 216         }
 217
 218         public function getVersion() {
 219                 return __CLASS__ . ': $Id$';
 220         }
 221 }