includes/api/ApiQueryAllLinks.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  * Query module to enumerate links from all pages together.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 switch ( $moduleName ) {
  36                         case 'alllinks':
  37                                 $prefix = 'al';
  38                                 $this->table = 'pagelinks';
  39                                 $this->tablePrefix = 'pl_';
  40                                 $this->fieldTitle = 'title';
  41                                 $this->dfltNamespace = NS_MAIN;
  42                                 $this->hasNamespace = true;
  43                                 $this->indexTag = 'l';
  44                                 $this->description = 'Enumerate all links that point to a given namespace';
  45                                 $this->descriptionWhat = 'link';
  46                                 $this->descriptionTargets = 'linked titles';
  47                                 $this->descriptionLinking = 'linking';
  48                                 break;
  49                         case 'alltransclusions':
  50                                 $prefix = 'at';
  51                                 $this->table = 'templatelinks';
  52                                 $this->tablePrefix = 'tl_';
  53                                 $this->fieldTitle = 'title';
  54                                 $this->dfltNamespace = NS_TEMPLATE;
  55                                 $this->hasNamespace = true;
  56                                 $this->indexTag = 't';
  57                                 $this->description =
  58                                         'List all transclusions (pages embedded using {{x}}), including non-existing';
  59                                 $this->descriptionWhat = 'transclusion';
  60                                 $this->descriptionTargets = 'transcluded titles';
  61                                 $this->descriptionLinking = 'transcluding';
  62                                 break;
  63                         case 'allfileusages':
  64                                 $prefix = 'af';
  65                                 $this->table = 'imagelinks';
  66                                 $this->tablePrefix = 'il_';
  67                                 $this->fieldTitle = 'to';
  68                                 $this->dfltNamespace = NS_FILE;
  69                                 $this->hasNamespace = false;
  70                                 $this->indexTag = 'f';
  71                                 $this->description = 'List all file usages, including non-existing';
  72                                 $this->descriptionWhat = 'file';
  73                                 $this->descriptionTargets = 'file titles';
  74                                 $this->descriptionLinking = 'using';
  75                                 break;
  76                         default:
  77                                 ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
  78                 }
  79
  80                 parent::__construct( $query, $moduleName, $prefix );
  81         }
  82
  83         public function execute() {
  84                 $this->run();
  85         }
  86
  87         public function getCacheMode( $params ) {
  88                 return 'public';
  89         }
  90
  91         public function executeGenerator( $resultPageSet ) {
  92                 $this->run( $resultPageSet );
  93         }
  94
  95         /**
  96          * @param $resultPageSet ApiPageSet
  97          * @return void
  98          */
  99         private function run( $resultPageSet = null ) {
 100                 $db = $this->getDB();
 101                 $params = $this->extractRequestParams();
 102
 103                 $pfx = $this->tablePrefix;
 104                 $fieldTitle = $this->fieldTitle;
 105                 $prop = array_flip( $params['prop'] );
 106                 $fld_ids = isset( $prop['ids'] );
 107                 $fld_title = isset( $prop['title'] );
 108                 if ( $this->hasNamespace ) {
 109                         $namespace = $params['namespace'];
 110                 } else {
 111                         $namespace = $this->dfltNamespace;
 112                 }
 113
 114                 if ( $params['unique'] ) {
 115                         if ( $fld_ids ) {
 116                                 $this->dieUsage(
 117                                         "{$this->getModuleName()} cannot return corresponding page " .
 118                                                 "ids in unique {$this->descriptionWhat}s mode",
 119                                         'params'
 120                                 );
 121                         }
 122                         $this->addOption( 'DISTINCT' );
 123                 }
 124
 125                 $this->addTables( $this->table );
 126                 if ( $this->hasNamespace ) {
 127                         $this->addWhereFld( $pfx . 'namespace', $namespace );
 128                 }
 129
 130                 $continue = !is_null( $params['continue'] );
 131                 if ( $continue ) {
 132                         $continueArr = explode( '|', $params['continue'] );
 133                         $op = $params['dir'] == 'descending' ? '<' : '>';
 134                         if ( $params['unique'] ) {
 135                                 $this->dieContinueUsageIf( count( $continueArr ) != 1 );
 136                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 137                                 $this->addWhere( "{$pfx}{$fieldTitle} $op= $continueTitle" );
 138                         } else {
 139                                 $this->dieContinueUsageIf( count( $continueArr ) != 2 );
 140                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 141                                 $continueFrom = intval( $continueArr[1] );
 142                                 $this->addWhere(
 143                                         "{$pfx}{$fieldTitle} $op $continueTitle OR " .
 144                                         "({$pfx}{$fieldTitle} = $continueTitle AND " .
 145                                         "{$pfx}from $op= $continueFrom)"
 146                                 );
 147                         }
 148                 }
 149
 150                 // 'continue' always overrides 'from'
 151                 $from = ( $continue || $params['from'] === null ? null :
 152                         $this->titlePartToKey( $params['from'], $namespace ) );
 153                 $to = ( $params['to'] === null ? null :
 154                         $this->titlePartToKey( $params['to'], $namespace ) );
 155                 $this->addWhereRange( $pfx . $fieldTitle, 'newer', $from, $to );
 156
 157                 if ( isset( $params['prefix'] ) ) {
 158                         $this->addWhere( $pfx . $fieldTitle . $db->buildLike( $this->titlePartToKey(
 159                                 $params['prefix'], $namespace ), $db->anyString() ) );
 160                 }
 161
 162                 $this->addFields( array( 'pl_title' => $pfx . $fieldTitle ) );
 163                 $this->addFieldsIf( array( 'pl_from' => $pfx . 'from' ), !$params['unique'] );
 164
 165                 if ( $this->hasNamespace ) {
 166                         $this->addOption( 'USE INDEX', $pfx . 'namespace' );
 167                 }
 168                 $limit = $params['limit'];
 169                 $this->addOption( 'LIMIT', $limit + 1 );
 170
 171                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 172                 $orderBy = array();
 173                 $orderBy[] = $pfx . $fieldTitle . $sort;
 174                 if ( !$params['unique'] ) {
 175                         $orderBy[] = $pfx . 'from' . $sort;
 176                 }
 177                 $this->addOption( 'ORDER BY', $orderBy );
 178
 179                 $res = $this->select( __METHOD__ );
 180
 181                 $pageids = array();
 182                 $titles = array();
 183                 $count = 0;
 184                 $result = $this->getResult();
 185                 foreach ( $res as $row ) {
 186                         if ( ++$count > $limit ) {
 187                                 // We've reached the one extra which shows that there are
 188                                 // additional pages to be had. Stop here...
 189                                 if ( $params['unique'] ) {
 190                                         $this->setContinueEnumParameter( 'continue', $row->pl_title );
 191                                 } else {
 192                                         $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 193                                 }
 194                                 break;
 195                         }
 196
 197                         if ( is_null( $resultPageSet ) ) {
 198                                 $vals = array();
 199                                 if ( $fld_ids ) {
 200                                         $vals['fromid'] = intval( $row->pl_from );
 201                                 }
 202                                 if ( $fld_title ) {
 203                                         $title = Title::makeTitle( $namespace, $row->pl_title );
 204                                         ApiQueryBase::addTitleInfo( $vals, $title );
 205                                 }
 206                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 207                                 if ( !$fit ) {
 208                                         if ( $params['unique'] ) {
 209                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title );
 210                                         } else {
 211                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 212                                         }
 213                                         break;
 214                                 }
 215                         } elseif ( $params['unique'] ) {
 216                                 $titles[] = Title::makeTitle( $namespace, $row->pl_title );
 217                         } else {
 218                                 $pageids[] = $row->pl_from;
 219                         }
 220                 }
 221
 222                 if ( is_null( $resultPageSet ) ) {
 223                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), $this->indexTag );
 224                 } elseif ( $params['unique'] ) {
 225                         $resultPageSet->populateFromTitles( $titles );
 226                 } else {
 227                         $resultPageSet->populateFromPageIDs( $pageids );
 228                 }
 229         }
 230
 231         public function getAllowedParams() {
 232                 $allowedParams = array(
 233                         'continue' => null,
 234                         'from' => null,
 235                         'to' => null,
 236                         'prefix' => null,
 237                         'unique' => false,
 238                         'prop' => array(
 239                                 ApiBase::PARAM_ISMULTI => true,
 240                                 ApiBase::PARAM_DFLT => 'title',
 241                                 ApiBase::PARAM_TYPE => array(
 242                                         'ids',
 243                                         'title'
 244                                 )
 245                         ),
 246                         'namespace' => array(
 247                                 ApiBase::PARAM_DFLT => $this->dfltNamespace,
 248                                 ApiBase::PARAM_TYPE => 'namespace'
 249                         ),
 250                         'limit' => array(
 251                                 ApiBase::PARAM_DFLT => 10,
 252                                 ApiBase::PARAM_TYPE => 'limit',
 253                                 ApiBase::PARAM_MIN => 1,
 254                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 255                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 256                         ),
 257                         'dir' => array(
 258                                 ApiBase::PARAM_DFLT => 'ascending',
 259                                 ApiBase::PARAM_TYPE => array(
 260                                         'ascending',
 261                                         'descending'
 262                                 )
 263                         ),
 264                 );
 265                 if ( !$this->hasNamespace ) {
 266                         unset( $allowedParams['namespace'] );
 267                 }
 268
 269                 return $allowedParams;
 270         }
 271
 272         public function getParamDescription() {
 273                 $p = $this->getModulePrefix();
 274                 $what = $this->descriptionWhat;
 275                 $targets = $this->descriptionTargets;
 276                 $linking = $this->descriptionLinking;
 277                 $paramDescription = array(
 278                         'from' => "The title of the $what to start enumerating from",
 279                         'to' => "The title of the $what to stop enumerating at",
 280                         'prefix' => "Search for all $targets that begin with this value",
 281                         'unique' => array(
 282                                 "Only show distinct $targets. Cannot be used with {$p}prop=ids.",
 283                                 'When used as a generator, yields target pages instead of source pages.',
 284                         ),
 285                         'prop' => array(
 286                                 'What pieces of information to include',
 287                                 " ids    - Adds the pageid of the $linking page (Cannot be used with {$p}unique)",
 288                                 " title  - Adds the title of the $what",
 289                         ),
 290                         'namespace' => 'The namespace to enumerate',
 291                         'limit' => 'How many total items to return',
 292                         'continue' => 'When more results are available, use this to continue',
 293                         'dir' => 'The direction in which to list',
 294                 );
 295                 if ( !$this->hasNamespace ) {
 296                         unset( $paramDescription['namespace'] );
 297                 }
 298
 299                 return $paramDescription;
 300         }
 301
 302         public function getResultProperties() {
 303                 return array(
 304                         'ids' => array(
 305                                 'fromid' => 'integer'
 306                         ),
 307                         'title' => array(
 308                                 'ns' => 'namespace',
 309                                 'title' => 'string'
 310                         )
 311                 );
 312         }
 313
 314         public function getDescription() {
 315                 return $this->description;
 316         }
 317
 318         public function getPossibleErrors() {
 319                 $m = $this->getModuleName();
 320                 $what = $this->descriptionWhat;
 321
 322                 return array_merge( parent::getPossibleErrors(), array(
 323                         array(
 324                                 'code' => 'params',
 325                                 'info' => "{$m} cannot return corresponding page ids in unique {$what}s mode"
 326                         ),
 327                 ) );
 328         }
 329
 330         public function getExamples() {
 331                 $p = $this->getModulePrefix();
 332                 $name = $this->getModuleName();
 333                 $what = $this->descriptionWhat;
 334                 $targets = $this->descriptionTargets;
 335
 336                 return array(
 337                         "api.php?action=query&list={$name}&{$p}from=B&{$p}prop=ids|title"
 338                                 => "List $targets with page ids they are from, including missing ones. Start at B",
 339                         "api.php?action=query&list={$name}&{$p}unique=&{$p}from=B"
 340                                 => "List unique $targets",
 341                         "api.php?action=query&generator={$name}&g{$p}unique=&g{$p}from=B"
 342                                 => "Gets all $targets, marking the missing ones",
 343                         "api.php?action=query&generator={$name}&g{$p}from=B"
 344                                 => "Gets pages containing the {$what}s",
 345                 );
 346         }
 347
 348         public function getHelpUrls() {
 349                 $name = ucfirst( $this->getModuleName() );
 350
 351                 return "https://www.mediawiki.org/wiki/API:{$name}";
 352         }
 353 }