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         private $table, $tablePrefix, $indexTag;
  35         private $fieldTitle = 'title';
  36         private $dfltNamespace = NS_MAIN;
  37         private $hasNamespace = true;
  38         private $useIndex = null;
  39         private $props = [];
  40
  41         public function __construct( ApiQuery $query, $moduleName ) {
  42                 switch ( $moduleName ) {
  43                         case 'alllinks':
  44                                 $prefix = 'al';
  45                                 $this->table = 'pagelinks';
  46                                 $this->tablePrefix = 'pl_';
  47                                 $this->useIndex = 'pl_namespace';
  48                                 $this->indexTag = 'l';
  49                                 break;
  50                         case 'alltransclusions':
  51                                 $prefix = 'at';
  52                                 $this->table = 'templatelinks';
  53                                 $this->tablePrefix = 'tl_';
  54                                 $this->dfltNamespace = NS_TEMPLATE;
  55                                 $this->useIndex = 'tl_namespace';
  56                                 $this->indexTag = 't';
  57                                 break;
  58                         case 'allfileusages':
  59                                 $prefix = 'af';
  60                                 $this->table = 'imagelinks';
  61                                 $this->tablePrefix = 'il_';
  62                                 $this->fieldTitle = 'to';
  63                                 $this->dfltNamespace = NS_FILE;
  64                                 $this->hasNamespace = false;
  65                                 $this->indexTag = 'f';
  66                                 break;
  67                         case 'allredirects':
  68                                 $prefix = 'ar';
  69                                 $this->table = 'redirect';
  70                                 $this->tablePrefix = 'rd_';
  71                                 $this->indexTag = 'r';
  72                                 $this->props = [
  73                                         'fragment' => 'rd_fragment',
  74                                         'interwiki' => 'rd_interwiki',
  75                                 ];
  76                                 break;
  77                         default:
  78                                 ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
  79                 }
  80
  81                 parent::__construct( $query, $moduleName, $prefix );
  82         }
  83
  84         public function execute() {
  85                 $this->run();
  86         }
  87
  88         public function getCacheMode( $params ) {
  89                 return 'public';
  90         }
  91
  92         public function executeGenerator( $resultPageSet ) {
  93                 $this->run( $resultPageSet );
  94         }
  95
  96         /**
  97          * @param ApiPageSet $resultPageSet
  98          * @return void
  99          */
 100         private function run( $resultPageSet = null ) {
 101                 $db = $this->getDB();
 102                 $params = $this->extractRequestParams();
 103
 104                 $pfx = $this->tablePrefix;
 105                 $fieldTitle = $this->fieldTitle;
 106                 $prop = array_flip( $params['prop'] );
 107                 $fld_ids = isset( $prop['ids'] );
 108                 $fld_title = isset( $prop['title'] );
 109                 if ( $this->hasNamespace ) {
 110                         $namespace = $params['namespace'];
 111                 } else {
 112                         $namespace = $this->dfltNamespace;
 113                 }
 114
 115                 if ( $params['unique'] ) {
 116                         $matches = array_intersect_key( $prop, $this->props + [ 'ids' => 1 ] );
 117                         if ( $matches ) {
 118                                 $p = $this->getModulePrefix();
 119                                 $this->dieWithError(
 120                                         [
 121                                                 'apierror-invalidparammix-cannotusewith',
 122                                                 "{$p}prop=" . implode( '|', array_keys( $matches ) ),
 123                                                 "{$p}unique"
 124                                         ],
 125                                         'invalidparammix'
 126                                 );
 127                         }
 128                         $this->addOption( 'DISTINCT' );
 129                 }
 130
 131                 $this->addTables( $this->table );
 132                 if ( $this->hasNamespace ) {
 133                         $this->addWhereFld( $pfx . 'namespace', $namespace );
 134                 }
 135
 136                 $continue = !is_null( $params['continue'] );
 137                 if ( $continue ) {
 138                         $continueArr = explode( '|', $params['continue'] );
 139                         $op = $params['dir'] == 'descending' ? '<' : '>';
 140                         if ( $params['unique'] ) {
 141                                 $this->dieContinueUsageIf( count( $continueArr ) != 1 );
 142                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 143                                 $this->addWhere( "{$pfx}{$fieldTitle} $op= $continueTitle" );
 144                         } else {
 145                                 $this->dieContinueUsageIf( count( $continueArr ) != 2 );
 146                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 147                                 $continueFrom = intval( $continueArr[1] );
 148                                 $this->addWhere(
 149                                         "{$pfx}{$fieldTitle} $op $continueTitle OR " .
 150                                         "({$pfx}{$fieldTitle} = $continueTitle AND " .
 151                                         "{$pfx}from $op= $continueFrom)"
 152                                 );
 153                         }
 154                 }
 155
 156                 // 'continue' always overrides 'from'
 157                 $from = ( $continue || $params['from'] === null ? null :
 158                         $this->titlePartToKey( $params['from'], $namespace ) );
 159                 $to = ( $params['to'] === null ? null :
 160                         $this->titlePartToKey( $params['to'], $namespace ) );
 161                 $this->addWhereRange( $pfx . $fieldTitle, 'newer', $from, $to );
 162
 163                 if ( isset( $params['prefix'] ) ) {
 164                         $this->addWhere( $pfx . $fieldTitle . $db->buildLike( $this->titlePartToKey(
 165                                 $params['prefix'], $namespace ), $db->anyString() ) );
 166                 }
 167
 168                 $this->addFields( [ 'pl_title' => $pfx . $fieldTitle ] );
 169                 $this->addFieldsIf( [ 'pl_from' => $pfx . 'from' ], !$params['unique'] );
 170                 foreach ( $this->props as $name => $field ) {
 171                         $this->addFieldsIf( $field, isset( $prop[$name] ) );
 172                 }
 173
 174                 if ( $this->useIndex ) {
 175                         $this->addOption( 'USE INDEX', $this->useIndex );
 176                 }
 177                 $limit = $params['limit'];
 178                 $this->addOption( 'LIMIT', $limit + 1 );
 179
 180                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 181                 $orderBy = [];
 182                 $orderBy[] = $pfx . $fieldTitle . $sort;
 183                 if ( !$params['unique'] ) {
 184                         $orderBy[] = $pfx . 'from' . $sort;
 185                 }
 186                 $this->addOption( 'ORDER BY', $orderBy );
 187
 188                 $res = $this->select( __METHOD__ );
 189
 190                 $pageids = [];
 191                 $titles = [];
 192                 $count = 0;
 193                 $result = $this->getResult();
 194                 foreach ( $res as $row ) {
 195                         if ( ++$count > $limit ) {
 196                                 // We've reached the one extra which shows that there are
 197                                 // additional pages to be had. Stop here...
 198                                 if ( $params['unique'] ) {
 199                                         $this->setContinueEnumParameter( 'continue', $row->pl_title );
 200                                 } else {
 201                                         $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 202                                 }
 203                                 break;
 204                         }
 205
 206                         if ( is_null( $resultPageSet ) ) {
 207                                 $vals = [
 208                                         ApiResult::META_TYPE => 'assoc',
 209                                 ];
 210                                 if ( $fld_ids ) {
 211                                         $vals['fromid'] = intval( $row->pl_from );
 212                                 }
 213                                 if ( $fld_title ) {
 214                                         $title = Title::makeTitle( $namespace, $row->pl_title );
 215                                         ApiQueryBase::addTitleInfo( $vals, $title );
 216                                 }
 217                                 foreach ( $this->props as $name => $field ) {
 218                                         if ( isset( $prop[$name] ) && $row->$field !== null && $row->$field !== '' ) {
 219                                                 $vals[$name] = $row->$field;
 220                                         }
 221                                 }
 222                                 $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
 223                                 if ( !$fit ) {
 224                                         if ( $params['unique'] ) {
 225                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title );
 226                                         } else {
 227                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 228                                         }
 229                                         break;
 230                                 }
 231                         } elseif ( $params['unique'] ) {
 232                                 $titles[] = Title::makeTitle( $namespace, $row->pl_title );
 233                         } else {
 234                                 $pageids[] = $row->pl_from;
 235                         }
 236                 }
 237
 238                 if ( is_null( $resultPageSet ) ) {
 239                         $result->addIndexedTagName( [ 'query', $this->getModuleName() ], $this->indexTag );
 240                 } elseif ( $params['unique'] ) {
 241                         $resultPageSet->populateFromTitles( $titles );
 242                 } else {
 243                         $resultPageSet->populateFromPageIDs( $pageids );
 244                 }
 245         }
 246
 247         public function getAllowedParams() {
 248                 $allowedParams = [
 249                         'continue' => [
 250                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 251                         ],
 252                         'from' => null,
 253                         'to' => null,
 254                         'prefix' => null,
 255                         'unique' => false,
 256                         'prop' => [
 257                                 ApiBase::PARAM_ISMULTI => true,
 258                                 ApiBase::PARAM_DFLT => 'title',
 259                                 ApiBase::PARAM_TYPE => array_merge(
 260                                         [ 'ids', 'title' ], array_keys( $this->props )
 261                                 ),
 262                                 ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
 263                         ],
 264                         'namespace' => [
 265                                 ApiBase::PARAM_DFLT => $this->dfltNamespace,
 266                                 ApiBase::PARAM_TYPE => 'namespace',
 267                                 ApiBase::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ],
 268                         ],
 269                         'limit' => [
 270                                 ApiBase::PARAM_DFLT => 10,
 271                                 ApiBase::PARAM_TYPE => 'limit',
 272                                 ApiBase::PARAM_MIN => 1,
 273                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 274                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 275                         ],
 276                         'dir' => [
 277                                 ApiBase::PARAM_DFLT => 'ascending',
 278                                 ApiBase::PARAM_TYPE => [
 279                                         'ascending',
 280                                         'descending'
 281                                 ]
 282                         ],
 283                 ];
 284                 if ( !$this->hasNamespace ) {
 285                         unset( $allowedParams['namespace'] );
 286                 }
 287
 288                 return $allowedParams;
 289         }
 290
 291         protected function getExamplesMessages() {
 292                 $p = $this->getModulePrefix();
 293                 $name = $this->getModuleName();
 294                 $path = $this->getModulePath();
 295
 296                 return [
 297                         "action=query&list={$name}&{$p}from=B&{$p}prop=ids|title"
 298                                 => "apihelp-$path-example-B",
 299                         "action=query&list={$name}&{$p}unique=&{$p}from=B"
 300                                 => "apihelp-$path-example-unique",
 301                         "action=query&generator={$name}&g{$p}unique=&g{$p}from=B"
 302                                 => "apihelp-$path-example-unique-generator",
 303                         "action=query&generator={$name}&g{$p}from=B"
 304                                 => "apihelp-$path-example-generator",
 305                 ];
 306         }
 307
 308         public function getHelpUrls() {
 309                 $name = ucfirst( $this->getModuleName() );
 310
 311                 return "https://www.mediawiki.org/wiki/Special:MyLanguage/API:{$name}";
 312         }
 313 }