includes/api/ApiQueryAllpages.php

   1 <?php
   2
   3 /**
   4  * Created on Sep 25, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   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
  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 all available pages.
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryAllpages extends ApiQueryGeneratorBase {
  37
  38         public function __construct( $query, $moduleName ) {
  39                 parent::__construct( $query, $moduleName, 'ap' );
  40         }
  41
  42         public function execute() {
  43                 $this->run();
  44         }
  45
  46         public function getCacheMode( $params ) {
  47                 return 'public';
  48         }
  49
  50         public function executeGenerator( $resultPageSet ) {
  51                 if ( $resultPageSet->isResolvingRedirects() ) {
  52                         $this->dieUsage( 'Use "gapfilterredir=nonredirects" option instead of "redirects" when using allpages as a generator', 'params' );
  53                 }
  54
  55                 $this->run( $resultPageSet );
  56         }
  57
  58         private function run( $resultPageSet = null ) {
  59                 $db = $this->getDB();
  60
  61                 $params = $this->extractRequestParams();
  62
  63                 // Page filters
  64                 $this->addTables( 'page' );
  65
  66                 if ( $params['filterredir'] == 'redirects' ) {
  67                         $this->addWhereFld( 'page_is_redirect', 1 );
  68                 } elseif ( $params['filterredir'] == 'nonredirects' ) {
  69                         $this->addWhereFld( 'page_is_redirect', 0 );
  70                 }
  71
  72                 $this->addWhereFld( 'page_namespace', $params['namespace'] );
  73                 $fromdir = ( $params['dir'] == 'descending' ? 'older' : 'newer' );
  74                 $todir = ( $params['dir'] != 'descending' ? 'older' : 'newer' );
  75                 $from = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
  76                 $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
  77                 $this->addWhereRange( 'page_title', $fromdir, $from, null );
  78                 $this->addWhereRange( 'page_title', $todir, $to, null );
  79
  80                 if ( isset( $params['prefix'] ) ) {
  81                         $this->addWhere( 'page_title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
  82                 }
  83
  84                 if ( is_null( $resultPageSet ) ) {
  85                         $selectFields = array(
  86                                 'page_namespace',
  87                                 'page_title',
  88                                 'page_id'
  89                         );
  90                 } else {
  91                         $selectFields = $resultPageSet->getPageTableFields();
  92                 }
  93
  94                 $this->addFields( $selectFields );
  95                 $forceNameTitleIndex = true;
  96                 if ( isset( $params['minsize'] ) ) {
  97                         $this->addWhere( 'page_len>=' . intval( $params['minsize'] ) );
  98                         $forceNameTitleIndex = false;
  99                 }
 100
 101                 if ( isset( $params['maxsize'] ) ) {
 102                         $this->addWhere( 'page_len<=' . intval( $params['maxsize'] ) );
 103                         $forceNameTitleIndex = false;
 104                 }
 105
 106                 // Page protection filtering
 107                 if ( !empty( $params['prtype'] ) ) {
 108                         $this->addTables( 'page_restrictions' );
 109                         $this->addWhere( 'page_id=pr_page' );
 110                         $this->addWhere( 'pr_expiry>' . $db->addQuotes( $db->timestamp() ) );
 111                         $this->addWhereFld( 'pr_type', $params['prtype'] );
 112
 113                         if ( isset( $params['prlevel'] ) ) {
 114                                 // Remove the empty string and '*' from the prlevel array
 115                                 $prlevel = array_diff( $params['prlevel'], array( '', '*' ) );
 116
 117                                 if ( !empty( $prlevel ) ) {
 118                                         $this->addWhereFld( 'pr_level', $prlevel );
 119                                 }
 120                         }
 121                         if ( $params['prfiltercascade'] == 'cascading' ) {
 122                                 $this->addWhereFld( 'pr_cascade', 1 );
 123                         } elseif ( $params['prfiltercascade'] == 'noncascading' ) {
 124                                 $this->addWhereFld( 'pr_cascade', 0 );
 125                         }
 126
 127                         $this->addOption( 'DISTINCT' );
 128
 129                         $forceNameTitleIndex = false;
 130
 131                 } elseif ( isset( $params['prlevel'] ) ) {
 132                         $this->dieUsage( 'prlevel may not be used without prtype', 'params' );
 133                 }
 134
 135                 if ( $params['filterlanglinks'] == 'withoutlanglinks' ) {
 136                         $this->addTables( 'langlinks' );
 137                         $this->addJoinConds( array( 'langlinks' => array( 'LEFT JOIN', 'page_id=ll_from' ) ) );
 138                         $this->addWhere( 'll_from IS NULL' );
 139                         $forceNameTitleIndex = false;
 140                 } elseif ( $params['filterlanglinks'] == 'withlanglinks' ) {
 141                         $this->addTables( 'langlinks' );
 142                         $this->addWhere( 'page_id=ll_from' );
 143                         $this->addOption( 'STRAIGHT_JOIN' );
 144                         // We have to GROUP BY all selected fields to stop
 145                         // PostgreSQL from whining
 146                         $this->addOption( 'GROUP BY', implode( ', ', $selectFields ) );
 147                         $forceNameTitleIndex = false;
 148                 }
 149
 150                 if ( $forceNameTitleIndex ) {
 151                         $this->addOption( 'USE INDEX', 'name_title' );
 152                 }
 153
 154                 $limit = $params['limit'];
 155                 $this->addOption( 'LIMIT', $limit + 1 );
 156                 $res = $this->select( __METHOD__ );
 157
 158                 $count = 0;
 159                 $result = $this->getResult();
 160                 foreach ( $res as $row ) {
 161                         if ( ++ $count > $limit ) {
 162                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 163                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 164                                 $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->page_title ) );
 165                                 break;
 166                         }
 167
 168                         if ( is_null( $resultPageSet ) ) {
 169                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 170                                 $vals = array(
 171                                         'pageid' => intval( $row->page_id ),
 172                                         'ns' => intval( $title->getNamespace() ),
 173                                         'title' => $title->getPrefixedText()
 174                                 );
 175                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 176                                 if ( !$fit ) {
 177                                         $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->page_title ) );
 178                                         break;
 179                                 }
 180                         } else {
 181                                 $resultPageSet->processDbRow( $row );
 182                         }
 183                 }
 184
 185                 if ( is_null( $resultPageSet ) ) {
 186                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'p' );
 187                 }
 188         }
 189
 190         public function getAllowedParams() {
 191                 global $wgRestrictionTypes, $wgRestrictionLevels;
 192
 193                 return array(
 194                         'from' => null,
 195                         'to' => null,
 196                         'prefix' => null,
 197                         'namespace' => array(
 198                                 ApiBase::PARAM_DFLT => 0,
 199                                 ApiBase::PARAM_TYPE => 'namespace',
 200                         ),
 201                         'filterredir' => array(
 202                                 ApiBase::PARAM_DFLT => 'all',
 203                                 ApiBase::PARAM_TYPE => array(
 204                                         'all',
 205                                         'redirects',
 206                                         'nonredirects'
 207                                 )
 208                         ),
 209                         'minsize' => array(
 210                                 ApiBase::PARAM_TYPE => 'integer',
 211                         ),
 212                         'maxsize' => array(
 213                                 ApiBase::PARAM_TYPE => 'integer',
 214                         ),
 215                         'prtype' => array(
 216                                 ApiBase::PARAM_TYPE => $wgRestrictionTypes,
 217                                 ApiBase::PARAM_ISMULTI => true
 218                         ),
 219                         'prlevel' => array(
 220                                 ApiBase::PARAM_TYPE => $wgRestrictionLevels,
 221                                 ApiBase::PARAM_ISMULTI => true
 222                         ),
 223                         'prfiltercascade' => array(
 224                                 ApiBase::PARAM_DFLT => 'all',
 225                                 ApiBase::PARAM_TYPE => array(
 226                                         'cascading',
 227                                         'noncascading',
 228                                         'all'
 229                                 ),
 230                         ),
 231                         'limit' => array(
 232                                 ApiBase::PARAM_DFLT => 10,
 233                                 ApiBase::PARAM_TYPE => 'limit',
 234                                 ApiBase::PARAM_MIN => 1,
 235                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 236                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 237                         ),
 238                         'dir' => array(
 239                                 ApiBase::PARAM_DFLT => 'ascending',
 240                                 ApiBase::PARAM_TYPE => array(
 241                                         'ascending',
 242                                         'descending'
 243                                 )
 244                         ),
 245                         'filterlanglinks' => array(
 246                                 ApiBase::PARAM_TYPE => array(
 247                                         'withlanglinks',
 248                                         'withoutlanglinks',
 249                                         'all'
 250                                 ),
 251                                 ApiBase::PARAM_DFLT => 'all'
 252                         )
 253                 );
 254         }
 255
 256         public function getParamDescription() {
 257                 $p = $this->getModulePrefix();
 258                 return array(
 259                         'from' => 'The page title to start enumerating from',
 260                         'to' => 'The page title to stop enumerating at',
 261                         'prefix' => 'Search for all page titles that begin with this value',
 262                         'namespace' => 'The namespace to enumerate',
 263                         'filterredir' => 'Which pages to list',
 264                         'dir' => 'The direction in which to list',
 265                         'minsize' => 'Limit to pages with at least this many bytes',
 266                         'maxsize' => 'Limit to pages with at most this many bytes',
 267                         'prtype' => 'Limit to protected pages only',
 268                         'prlevel' => "The protection level (must be used with {$p}prtype= parameter)",
 269                         'prfiltercascade' => "Filter protections based on cascadingness (ignored when {$p}prtype isn't set)",
 270                         'filterlanglinks' => 'Filter based on whether a page has langlinks',
 271                         'limit' => 'How many total pages to return.'
 272                 );
 273         }
 274
 275         public function getDescription() {
 276                 return 'Enumerate all pages sequentially in a given namespace';
 277         }
 278
 279         public function getPossibleErrors() {
 280                 return array_merge( parent::getPossibleErrors(), array(
 281                         array( 'code' => 'params', 'info' => 'Use "gapfilterredir=nonredirects" option instead of "redirects" when using allpages as a generator' ),
 282                         array( 'code' => 'params', 'info' => 'prlevel may not be used without prtype' ),
 283                 ) );
 284         }
 285
 286         protected function getExamples() {
 287                 return array(
 288                         'Simple Use',
 289                         ' Show a list of pages starting at the letter "B"',
 290                         '  api.php?action=query&list=allpages&apfrom=B',
 291                         'Using as Generator',
 292                         ' Show info about 4 pages starting at the letter "T"',
 293                         '  api.php?action=query&generator=allpages&gaplimit=4&gapfrom=T&prop=info',
 294                         ' Show content of first 2 non-redirect pages begining at "Re"',
 295                         '  api.php?action=query&generator=allpages&gaplimit=2&gapfilterredir=nonredirects&gapfrom=Re&prop=revisions&rvprop=content'
 296                 );
 297         }
 298
 299         public function getVersion() {
 300                 return __CLASS__ . ': $Id$';
 301         }
 302 }