includes/api/ApiQueryExtLinksUsage.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  * @ingroup API
  29  */
  30 class ApiQueryExtLinksUsage extends ApiQueryGeneratorBase {
  31
  32         public function __construct( $query, $moduleName ) {
  33                 parent::__construct( $query, $moduleName, 'eu' );
  34         }
  35
  36         public function execute() {
  37                 $this->run();
  38         }
  39
  40         public function getCacheMode( $params ) {
  41                 return 'public';
  42         }
  43
  44         public function executeGenerator( $resultPageSet ) {
  45                 $this->run( $resultPageSet );
  46         }
  47
  48         /**
  49          * @param $resultPageSet ApiPageSet
  50          */
  51         private function run( $resultPageSet = null ) {
  52                 $params = $this->extractRequestParams();
  53
  54                 $query = $params['query'];
  55                 $protocol = self::getProtocolPrefix( $params['protocol'] );
  56
  57                 $this->addTables( array( 'page', 'externallinks' ) );   // must be in this order for 'USE INDEX'
  58                 $this->addOption( 'USE INDEX', 'el_index' );
  59                 $this->addWhere( 'page_id=el_from' );
  60
  61                 global $wgMiserMode;
  62                 $miser_ns = array();
  63                 if ( $wgMiserMode ) {
  64                         $miser_ns = $params['namespace'];
  65                 } else {
  66                         $this->addWhereFld( 'page_namespace', $params['namespace'] );
  67                 }
  68
  69                 $whereQuery = $this->prepareUrlQuerySearchString( $query, $protocol );
  70
  71                 if ( $whereQuery !== null ) {
  72                         $this->addWhere( $whereQuery );
  73                 }
  74
  75                 $prop = array_flip( $params['prop'] );
  76                 $fld_ids = isset( $prop['ids'] );
  77                 $fld_title = isset( $prop['title'] );
  78                 $fld_url = isset( $prop['url'] );
  79
  80                 if ( is_null( $resultPageSet ) ) {
  81                         $this->addFields( array(
  82                                 'page_id',
  83                                 'page_namespace',
  84                                 'page_title'
  85                         ) );
  86                         $this->addFieldsIf( 'el_to', $fld_url );
  87                 } else {
  88                         $this->addFields( $resultPageSet->getPageTableFields() );
  89                 }
  90
  91                 $limit = $params['limit'];
  92                 $offset = $params['offset'];
  93                 $this->addOption( 'LIMIT', $limit + 1 );
  94                 if ( isset( $offset ) ) {
  95                         $this->addOption( 'OFFSET', $offset );
  96                 }
  97
  98                 $res = $this->select( __METHOD__ );
  99
 100                 $result = $this->getResult();
 101                 $count = 0;
 102                 foreach ( $res as $row ) {
 103                         if ( ++ $count > $limit ) {
 104                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 105                                 $this->setContinueEnumParameter( 'offset', $offset + $limit );
 106                                 break;
 107                         }
 108
 109                         if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
 110                                 continue;
 111                         }
 112
 113                         if ( is_null( $resultPageSet ) ) {
 114                                 $vals = array();
 115                                 if ( $fld_ids ) {
 116                                         $vals['pageid'] = intval( $row->page_id );
 117                                 }
 118                                 if ( $fld_title ) {
 119                                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 120                                         ApiQueryBase::addTitleInfo( $vals, $title );
 121                                 }
 122                                 if ( $fld_url ) {
 123                                         // We *could* run this through wfExpandUrl() but I think it's better to output the link verbatim, even if it's protocol-relative --Roan
 124                                         $vals['url'] = $row->el_to;
 125                                 }
 126                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 127                                 if ( !$fit ) {
 128                                         $this->setContinueEnumParameter( 'offset', $offset + $count - 1 );
 129                                         break;
 130                                 }
 131                         } else {
 132                                 $resultPageSet->processDbRow( $row );
 133                         }
 134                 }
 135
 136                 if ( is_null( $resultPageSet ) ) {
 137                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ),
 138                                         $this->getModulePrefix() );
 139                 }
 140         }
 141
 142         public function getAllowedParams() {
 143                 return array(
 144                         'prop' => array(
 145                                 ApiBase::PARAM_ISMULTI => true,
 146                                 ApiBase::PARAM_DFLT => 'ids|title|url',
 147                                 ApiBase::PARAM_TYPE => array(
 148                                         'ids',
 149                                         'title',
 150                                         'url'
 151                                 )
 152                         ),
 153                         'offset' => array(
 154                                 ApiBase::PARAM_TYPE => 'integer'
 155                         ),
 156                         'protocol' => array(
 157                                 ApiBase::PARAM_TYPE => self::prepareProtocols(),
 158                                 ApiBase::PARAM_DFLT => '',
 159                         ),
 160                         'query' => null,
 161                         'namespace' => array(
 162                                 ApiBase::PARAM_ISMULTI => true,
 163                                 ApiBase::PARAM_TYPE => 'namespace'
 164                         ),
 165                         'limit' => array(
 166                                 ApiBase::PARAM_DFLT => 10,
 167                                 ApiBase::PARAM_TYPE => 'limit',
 168                                 ApiBase::PARAM_MIN => 1,
 169                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 170                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 171                         )
 172                 );
 173         }
 174
 175         public static function prepareProtocols() {
 176                 global $wgUrlProtocols;
 177                 $protocols = array( '' );
 178                 foreach ( $wgUrlProtocols as $p ) {
 179                         if ( $p !== '//' ) {
 180                                 $protocols[] = substr( $p, 0, strpos( $p, ':' ) );
 181                         }
 182                 }
 183                 return $protocols;
 184         }
 185
 186         public static function getProtocolPrefix( $protocol ) {
 187                 // Find the right prefix
 188                 global $wgUrlProtocols;
 189                 if ( $protocol && !in_array( $protocol, $wgUrlProtocols ) ) {
 190                         foreach ( $wgUrlProtocols as $p ) {
 191                                 if ( substr( $p, 0, strlen( $protocol ) ) === $protocol ) {
 192                                         $protocol = $p;
 193                                         break;
 194                                 }
 195                         }
 196
 197                         return $protocol;
 198                 } else {
 199                         return null;
 200                 }
 201         }
 202
 203         public function getParamDescription() {
 204                 global $wgMiserMode;
 205                 $p = $this->getModulePrefix();
 206                 $desc = array(
 207                         'prop' => array(
 208                                 'What pieces of information to include',
 209                                 ' ids    - Adds the ID of page',
 210                                 ' title  - Adds the title and namespace ID of the page',
 211                                 ' url    - Adds the URL used in the page',
 212                         ),
 213                         'offset' => 'Used for paging. Use the value returned for "continue"',
 214                         'protocol' => array(
 215                                 "Protocol of the url. If empty and {$p}query set, the protocol is http.",
 216                                 "Leave both this and {$p}query empty to list all external links"
 217                         ),
 218                         'query' => 'Search string without protocol. See [[Special:LinkSearch]]. Leave empty to list all external links',
 219                         'namespace' => 'The page namespace(s) to enumerate.',
 220                         'limit' => 'How many pages to return.'
 221                 );
 222
 223                 if ( $wgMiserMode ) {
 224                         $desc['namespace'] = array(
 225                                 $desc['namespace'],
 226                                 "NOTE: Due to \$wgMiserMode, using this may result in fewer than \"{$p}limit\" results",
 227                                 'returned before continuing; in extreme cases, zero results may be returned',
 228                         );
 229                 }
 230
 231                 return $desc;
 232         }
 233
 234         public function getDescription() {
 235                 return 'Enumerate pages that contain a given URL';
 236         }
 237
 238         public function getPossibleErrors() {
 239                 return array_merge( parent::getPossibleErrors(), array(
 240                         array( 'code' => 'bad_query', 'info' => 'Invalid query' ),
 241                 ) );
 242         }
 243
 244         public function getExamples() {
 245                 return array(
 246                         'api.php?action=query&list=exturlusage&euquery=www.mediawiki.org'
 247                 );
 248         }
 249
 250         public function getHelpUrls() {
 251                 return 'https://www.mediawiki.org/wiki/API:Exturlusage';
 252         }
 253
 254         public function getVersion() {
 255                 return __CLASS__ . ': $Id$';
 256         }
 257 }