includes/api/ApiQueryIWBacklinks.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.17+
   4  *
   5  * Created on May 14, 2010
   6  *
   7  * Copyright © 2010 Sam Reed
   8  * Copyright © 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  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @file
  26  */
  27
  28 /**
  29  * This gives links pointing to the given interwiki
  30  * @ingroup API
  31  */
  32 class ApiQueryIWBacklinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( ApiQuery $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'iwbl' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function executeGenerator( $resultPageSet ) {
  43                 $this->run( $resultPageSet );
  44         }
  45
  46         /**
  47          * @param ApiPageSet $resultPageSet
  48          * @return void
  49          */
  50         public function run( $resultPageSet = null ) {
  51                 $params = $this->extractRequestParams();
  52
  53                 if ( isset( $params['title'] ) && !isset( $params['prefix'] ) ) {
  54                         $this->dieWithError(
  55                                 [
  56                                         'apierror-invalidparammix-mustusewith',
  57                                         $this->encodeParamName( 'title' ),
  58                                         $this->encodeParamName( 'prefix' ),
  59                                 ],
  60                                 'invalidparammix'
  61                         );
  62                 }
  63
  64                 if ( !is_null( $params['continue'] ) ) {
  65                         $cont = explode( '|', $params['continue'] );
  66                         $this->dieContinueUsageIf( count( $cont ) != 3 );
  67
  68                         $db = $this->getDB();
  69                         $op = $params['dir'] == 'descending' ? '<' : '>';
  70                         $prefix = $db->addQuotes( $cont[0] );
  71                         $title = $db->addQuotes( $cont[1] );
  72                         $from = intval( $cont[2] );
  73                         $this->addWhere(
  74                                 "iwl_prefix $op $prefix OR " .
  75                                 "(iwl_prefix = $prefix AND " .
  76                                 "(iwl_title $op $title OR " .
  77                                 "(iwl_title = $title AND " .
  78                                 "iwl_from $op= $from)))"
  79                         );
  80                 }
  81
  82                 $prop = array_flip( $params['prop'] );
  83                 $iwprefix = isset( $prop['iwprefix'] );
  84                 $iwtitle = isset( $prop['iwtitle'] );
  85
  86                 $this->addTables( [ 'iwlinks', 'page' ] );
  87                 $this->addWhere( 'iwl_from = page_id' );
  88
  89                 $this->addFields( [ 'page_id', 'page_title', 'page_namespace', 'page_is_redirect',
  90                         'iwl_from', 'iwl_prefix', 'iwl_title' ] );
  91
  92                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  93                 if ( isset( $params['prefix'] ) ) {
  94                         $this->addWhereFld( 'iwl_prefix', $params['prefix'] );
  95                         if ( isset( $params['title'] ) ) {
  96                                 $this->addWhereFld( 'iwl_title', $params['title'] );
  97                                 $this->addOption( 'ORDER BY', 'iwl_from' . $sort );
  98                         } else {
  99                                 $this->addOption( 'ORDER BY', [
 100                                         'iwl_title' . $sort,
 101                                         'iwl_from' . $sort
 102                                 ] );
 103                         }
 104                 } else {
 105                         $this->addOption( 'ORDER BY', [
 106                                 'iwl_prefix' . $sort,
 107                                 'iwl_title' . $sort,
 108                                 'iwl_from' . $sort
 109                         ] );
 110                 }
 111
 112                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 113
 114                 $res = $this->select( __METHOD__ );
 115
 116                 $pages = [];
 117
 118                 $count = 0;
 119                 $result = $this->getResult();
 120                 foreach ( $res as $row ) {
 121                         if ( ++$count > $params['limit'] ) {
 122                                 // We've reached the one extra which shows that there are
 123                                 // additional pages to be had. Stop here...
 124                                 // Continue string preserved in case the redirect query doesn't
 125                                 // pass the limit
 126                                 $this->setContinueEnumParameter(
 127                                         'continue',
 128                                         "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
 129                                 );
 130                                 break;
 131                         }
 132
 133                         if ( !is_null( $resultPageSet ) ) {
 134                                 $pages[] = Title::newFromRow( $row );
 135                         } else {
 136                                 $entry = [ 'pageid' => (int)$row->page_id ];
 137
 138                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 139                                 ApiQueryBase::addTitleInfo( $entry, $title );
 140
 141                                 if ( $row->page_is_redirect ) {
 142                                         $entry['redirect'] = true;
 143                                 }
 144
 145                                 if ( $iwprefix ) {
 146                                         $entry['iwprefix'] = $row->iwl_prefix;
 147                                 }
 148
 149                                 if ( $iwtitle ) {
 150                                         $entry['iwtitle'] = $row->iwl_title;
 151                                 }
 152
 153                                 $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $entry );
 154                                 if ( !$fit ) {
 155                                         $this->setContinueEnumParameter(
 156                                                 'continue',
 157                                                 "{$row->iwl_prefix}|{$row->iwl_title}|{$row->iwl_from}"
 158                                         );
 159                                         break;
 160                                 }
 161                         }
 162                 }
 163
 164                 if ( is_null( $resultPageSet ) ) {
 165                         $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'iw' );
 166                 } else {
 167                         $resultPageSet->populateFromTitles( $pages );
 168                 }
 169         }
 170
 171         public function getCacheMode( $params ) {
 172                 return 'public';
 173         }
 174
 175         public function getAllowedParams() {
 176                 return [
 177                         'prefix' => null,
 178                         'title' => null,
 179                         'continue' => [
 180                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 181                         ],
 182                         'limit' => [
 183                                 ApiBase::PARAM_DFLT => 10,
 184                                 ApiBase::PARAM_TYPE => 'limit',
 185                                 ApiBase::PARAM_MIN => 1,
 186                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 187                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 188                         ],
 189                         'prop' => [
 190                                 ApiBase::PARAM_ISMULTI => true,
 191                                 ApiBase::PARAM_DFLT => '',
 192                                 ApiBase::PARAM_TYPE => [
 193                                         'iwprefix',
 194                                         'iwtitle',
 195                                 ],
 196                                 ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
 197                         ],
 198                         'dir' => [
 199                                 ApiBase::PARAM_DFLT => 'ascending',
 200                                 ApiBase::PARAM_TYPE => [
 201                                         'ascending',
 202                                         'descending'
 203                                 ]
 204                         ],
 205                 ];
 206         }
 207
 208         protected function getExamplesMessages() {
 209                 return [
 210                         'action=query&list=iwbacklinks&iwbltitle=Test&iwblprefix=wikibooks'
 211                                 => 'apihelp-query+iwbacklinks-example-simple',
 212                         'action=query&generator=iwbacklinks&giwbltitle=Test&giwblprefix=wikibooks&prop=info'
 213                                 => 'apihelp-query+iwbacklinks-example-generator',
 214                 ];
 215         }
 216
 217         public function getHelpUrls() {
 218                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Iwbacklinks';
 219         }
 220 }