includes/api/ApiQueryCategoryMembers.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on June 14, 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  * A query module to enumerate pages that belong to a category.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryCategoryMembers extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'cm' );
  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                 $params = $this->extractRequestParams();
  57
  58                 $this->requireOnlyOneParameter( $params, 'title', 'pageid' );
  59
  60                 if ( isset( $params['title'] ) ) {
  61                         $categoryTitle = Title::newFromText( $params['title'] );
  62
  63                         if ( is_null( $categoryTitle ) || $categoryTitle->getNamespace() != NS_CATEGORY ) {
  64                                 $this->dieUsage( 'The category name you entered is not valid', 'invalidcategory' );
  65                         }
  66                 } elseif( isset( $params['pageid'] ) ) {
  67                         $categoryTitle = Title::newFromID( $params['pageid'] );
  68
  69                         if ( !$categoryTitle ) {
  70                                 $this->dieUsageMsg( array( 'nosuchpageid', $params['pageid'] ) );
  71                         } elseif ( $categoryTitle->getNamespace() != NS_CATEGORY ) {
  72                                 $this->dieUsage( 'The category name you entered is not valid', 'invalidcategory' );
  73                         }
  74                 }
  75
  76                 $prop = array_flip( $params['prop'] );
  77                 $fld_ids = isset( $prop['ids'] );
  78                 $fld_title = isset( $prop['title'] );
  79                 $fld_sortkey = isset( $prop['sortkey'] );
  80                 $fld_sortkeyprefix = isset( $prop['sortkeyprefix'] );
  81                 $fld_timestamp = isset( $prop['timestamp'] );
  82                 $fld_type = isset( $prop['type'] );
  83
  84                 if ( is_null( $resultPageSet ) ) {
  85                         $this->addFields( array( 'cl_from', 'page_namespace', 'page_title' ) );
  86                         $this->addFieldsIf( 'page_id', $fld_ids );
  87                         $this->addFieldsIf( 'cl_sortkey_prefix', $fld_sortkeyprefix );
  88                         $this->addFieldsIf( 'cl_sortkey', $fld_sortkey );
  89                 } else {
  90                         $this->addFields( $resultPageSet->getPageTableFields() ); // will include page_ id, ns, title
  91                         $this->addFields( array( 'cl_from', 'cl_sortkey' ) );
  92                 }
  93
  94                 $this->addFieldsIf( 'cl_timestamp', $fld_timestamp || $params['sort'] == 'timestamp' );
  95                 $this->addFieldsIf( 'cl_type', $fld_type );
  96
  97                 $this->addTables( array( 'page', 'categorylinks' ) );   // must be in this order for 'USE INDEX'
  98
  99                 $this->addWhereFld( 'cl_to', $categoryTitle->getDBkey() );
 100                 $this->addWhereFld( 'cl_type', $params['type'] );
 101
 102                 // Scanning large datasets for rare categories sucks, and I already told
 103                 // how to have efficient subcategory access :-) ~~~~ (oh well, domas)
 104                 global $wgMiserMode;
 105                 $miser_ns = array();
 106                 if ( $wgMiserMode ) {
 107                         $miser_ns = $params['namespace'];
 108                 } else {
 109                         $this->addWhereFld( 'page_namespace', $params['namespace'] );
 110                 }
 111
 112                 $dir = $params['dir'] == 'asc' ? 'newer' : 'older';
 113
 114                 if ( $params['sort'] == 'timestamp' ) {
 115                         $this->addWhereRange( 'cl_timestamp',
 116                                 $dir,
 117                                 $params['start'],
 118                                 $params['end'] );
 119
 120                         $this->addOption( 'USE INDEX', 'cl_timestamp' );
 121                 } else {
 122                         // The below produces ORDER BY cl_type, cl_sortkey, cl_from, possibly with DESC added to each of them
 123                         $this->addWhereRange( 'cl_type', $dir, null, null );
 124                         $this->addWhereRange( 'cl_sortkey',
 125                                 $dir,
 126                                 $params['startsortkey'],
 127                                 $params['endsortkey'] );
 128                         $this->addWhereRange( 'cl_from', $dir, null, null );
 129                         $this->addOption( 'USE INDEX', 'cl_sortkey' );
 130                 }
 131
 132                 $this->setContinuation( $params['continue'], $params['dir'] );
 133
 134                 $this->addWhere( 'cl_from=page_id' );
 135
 136                 $limit = $params['limit'];
 137                 $this->addOption( 'LIMIT', $limit + 1 );
 138
 139                 $count = 0;
 140                 $res = $this->select( __METHOD__ );
 141                 foreach ( $res as $row ) {
 142                         if ( ++ $count > $limit ) {
 143                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 144                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 145                                 if ( $params['sort'] == 'timestamp' ) {
 146                                         $this->setContinueEnumParameter( 'start', wfTimestamp( TS_ISO_8601, $row->cl_timestamp ) );
 147                                 } else {
 148                                         $this->setContinueEnumParameter( 'continue', $row->cl_from );
 149                                 }
 150                                 break;
 151                         }
 152
 153                         // Since domas won't tell anyone what he told long ago, apply
 154                         // cmnamespace here. This means the query may return 0 actual
 155                         // results, but on the other hand it could save returning 5000
 156                         // useless results to the client. ~~~~
 157                         if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
 158                                 continue;
 159                         }
 160
 161                         if ( is_null( $resultPageSet ) ) {
 162                                 $vals = array();
 163                                 if ( $fld_ids ) {
 164                                         $vals['pageid'] = intval( $row->page_id );
 165                                 }
 166                                 if ( $fld_title ) {
 167                                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 168                                         ApiQueryBase::addTitleInfo( $vals, $title );
 169                                 }
 170                                 if ( $fld_sortkey ) {
 171                                         $vals['sortkey'] = $row->cl_sortkey;
 172                                 }
 173                                 if ( $fld_sortkeyprefix ) {
 174                                         $vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
 175                                 }
 176                                 if ( $fld_type  ) {
 177                                         $vals['type'] = $row->cl_type;
 178                                 }
 179                                 if ( $fld_timestamp ) {
 180                                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
 181                                 }
 182                                 $fit = $this->getResult()->addValue( array( 'query', $this->getModuleName() ),
 183                                                 null, $vals );
 184                                 if ( !$fit ) {
 185                                         if ( $params['sort'] == 'timestamp' ) {
 186                                                 $this->setContinueEnumParameter( 'start', wfTimestamp( TS_ISO_8601, $row->cl_timestamp ) );
 187                                         } else {
 188                                                 $this->setContinueEnumParameter( 'continue', $row->cl_from );
 189                                         }
 190                                         break;
 191                                 }
 192                         } else {
 193                                 $resultPageSet->processDbRow( $row );
 194                         }
 195                 }
 196
 197                 if ( is_null( $resultPageSet ) ) {
 198                         $this->getResult()->setIndexedTagName_internal(
 199                                          array( 'query', $this->getModuleName() ), 'cm' );
 200                 }
 201         }
 202
 203         /**
 204          * Add DB WHERE clause to continue previous query based on 'continue' parameter
 205          */
 206         private function setContinuation( $continue, $dir ) {
 207                 if ( is_null( $continue ) ) {
 208                         return; // This is not a continuation request
 209                 }
 210
 211                 $encFrom = $this->getDB()->addQuotes( intval( $continue ) );
 212
 213                 $op = ( $dir == 'desc' ? '<=' : '>=' );
 214
 215                 $this->addWhere( "cl_from $op $encFrom" );
 216         }
 217
 218         public function getAllowedParams() {
 219                 return array(
 220                         'title' => array(
 221                                 ApiBase::PARAM_TYPE => 'string',
 222                         ),
 223                         'pageid' => array(
 224                                 ApiBase::PARAM_TYPE => 'integer'
 225                         ),
 226                         'prop' => array(
 227                                 ApiBase::PARAM_DFLT => 'ids|title',
 228                                 ApiBase::PARAM_ISMULTI => true,
 229                                 ApiBase::PARAM_TYPE => array (
 230                                         'ids',
 231                                         'title',
 232                                         'sortkey',
 233                                         'sortkeyprefix',
 234                                         'type',
 235                                         'timestamp',
 236                                 )
 237                         ),
 238                         'namespace' => array (
 239                                 ApiBase::PARAM_ISMULTI => true,
 240                                 ApiBase::PARAM_TYPE => 'namespace',
 241                         ),
 242                         'type' => array(
 243                                 ApiBase::PARAM_ISMULTI => true,
 244                                 ApiBase::PARAM_DFLT => 'page|subcat|file',
 245                                 ApiBase::PARAM_TYPE => array(
 246                                         'page',
 247                                         'subcat',
 248                                         'file'
 249                                 )
 250                         ),
 251                         'continue' => null,
 252                         'limit' => array(
 253                                 ApiBase::PARAM_TYPE => 'limit',
 254                                 ApiBase::PARAM_DFLT => 10,
 255                                 ApiBase::PARAM_MIN => 1,
 256                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 257                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 258                         ),
 259                         'sort' => array(
 260                                 ApiBase::PARAM_DFLT => 'sortkey',
 261                                 ApiBase::PARAM_TYPE => array(
 262                                         'sortkey',
 263                                         'timestamp'
 264                                 )
 265                         ),
 266                         'dir' => array(
 267                                 ApiBase::PARAM_DFLT => 'asc',
 268                                 ApiBase::PARAM_TYPE => array(
 269                                         'asc',
 270                                         'desc'
 271                                 )
 272                         ),
 273                         'start' => array(
 274                                 ApiBase::PARAM_TYPE => 'timestamp'
 275                         ),
 276                         'end' => array(
 277                                 ApiBase::PARAM_TYPE => 'timestamp'
 278                         ),
 279                         'startsortkey' => null,
 280                         'endsortkey' => null,
 281                 );
 282         }
 283
 284         public function getParamDescription() {
 285                 global $wgMiserMode;
 286                 $p = $this->getModulePrefix();
 287                 $desc = array(
 288                         'title' => 'Which category to enumerate (required). Must include Category: prefix. Cannot be used together with cmpageid',
 289                         'pageid' => 'Page ID of the category to enumerate. Cannot be used together with cmtitle',
 290                         'prop' => array(
 291                                 'What pieces of information to include',
 292                                 ' ids           - Adds the page ID',
 293                                 ' title         - Adds the title and namespace ID of the page',
 294                                 ' sortkey       - Adds the sortkey used for sorting in the category (may not be human-readble)',
 295                                 ' sortkeyprefix - Adds the sortkey prefix used for sorting in the category (human-readable part of the sortkey)',
 296                                 ' type          - Adds the type that the page has been categorised as (page, subcat or file)',
 297                                 ' timestamp     - Adds the timestamp of when the page was included',
 298                         ),
 299                         'namespace' => 'Only include pages in these namespaces',
 300                         'type' => 'What type of category members to include',
 301                         'sort' => 'Property to sort by',
 302                         'dir' => 'In which direction to sort',
 303                         'start' => "Timestamp to start listing from. Can only be used with {$p}sort=timestamp",
 304                         'end' => "Timestamp to end listing at. Can only be used with {$p}sort=timestamp",
 305                         'startsortkey' => "Sortkey to start listing from. Can only be used with {$p}sort=sortkey",
 306                         'endsortkey' => "Sortkey to end listing at. Can only be used with {$p}sort=sortkey",
 307                         'continue' => 'For large categories, give the value retured from previous query',
 308                         'limit' => 'The maximum number of pages to return.',
 309                 );
 310                 if ( $wgMiserMode ) {
 311                         $desc['namespace'] = array(
 312                                 $desc['namespace'],
 313                                 'NOTE: Due to $wgMiserMode, using this may result in fewer than "limit" results',
 314                                 'returned before continuing; in extreme cases, zero results may be returned',
 315                         );
 316                 }
 317                 return $desc;
 318         }
 319
 320         public function getDescription() {
 321                 return 'List all pages in a given category';
 322         }
 323
 324         public function getPossibleErrors() {
 325                 return array_merge( parent::getPossibleErrors(), array(
 326                         array( 'code' => 'cmmissingparam', 'info' => 'One of the parameters title, pageid is required' ),
 327                         array( 'code' => 'cminvalidparammix', 'info' => 'The parameters title, pageid can not be used together' ),
 328                         array( 'code' => 'invalidcategory', 'info' => 'The category name you entered is not valid' ),
 329                         array( 'code' => 'badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 330                         array( 'nosuchpageid', 'pageid' ),
 331                 ) );
 332         }
 333
 334         protected function getExamples() {
 335                 return array(
 336                         'Get first 10 pages in [[Category:Physics]]:',
 337                         '  api.php?action=query&list=categorymembers&cmtitle=Category:Physics',
 338                         'Get page info about first 10 pages in [[Category:Physics]]:',
 339                         '  api.php?action=query&generator=categorymembers&gcmtitle=Category:Physics&prop=info',
 340                 );
 341         }
 342
 343         public function getVersion() {
 344                 return __CLASS__ . ': $Id$';
 345         }
 346 }