includes/api/ApiQueryContributors.php

   1 <?php
   2 /**
   3  * Query the list of contributors to a page
   4  *
   5  * Created on Nov 14, 2013
   6  *
   7  * Copyright © 2013 Brad Jorsch
   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  * @since 1.23
  26  */
  27
  28 /**
  29  * A query module to show contributors to a page
  30  *
  31  * @ingroup API
  32  * @since 1.23
  33  */
  34 class ApiQueryContributors extends ApiQueryBase {
  35         /** We don't want to process too many pages at once (it hits cold
  36          * database pages too heavily), so only do the first MAX_PAGES input pages
  37          * in each API call (leaving the rest for continuation).
  38          */
  39         const MAX_PAGES = 100;
  40
  41         public function __construct( ApiQuery $query, $moduleName ) {
  42                 // "pc" is short for "page contributors", "co" was already taken by the
  43                 // GeoData extension's prop=coordinates.
  44                 parent::__construct( $query, $moduleName, 'pc' );
  45         }
  46
  47         public function execute() {
  48                 $db = $this->getDB();
  49                 $params = $this->extractRequestParams();
  50                 $this->requireMaxOneParameter( $params, 'group', 'excludegroup', 'rights', 'excluderights' );
  51
  52                 // Only operate on existing pages
  53                 $pages = array_keys( $this->getPageSet()->getGoodTitles() );
  54
  55                 // Filter out already-processed pages
  56                 if ( $params['continue'] !== null ) {
  57                         $cont = explode( '|', $params['continue'] );
  58                         $this->dieContinueUsageIf( count( $cont ) != 2 );
  59                         $cont_page = (int)$cont[0];
  60                         $pages = array_filter( $pages, function ( $v ) use ( $cont_page ) {
  61                                 return $v >= $cont_page;
  62                         } );
  63                 }
  64                 if ( !count( $pages ) ) {
  65                         // Nothing to do
  66                         return;
  67                 }
  68
  69                 // Apply MAX_PAGES, leaving any over the limit for a continue.
  70                 sort( $pages );
  71                 $continuePages = null;
  72                 if ( count( $pages ) > self::MAX_PAGES ) {
  73                         $continuePages = $pages[self::MAX_PAGES] . '|0';
  74                         $pages = array_slice( $pages, 0, self::MAX_PAGES );
  75                 }
  76
  77                 $result = $this->getResult();
  78
  79                 // First, count anons
  80                 $this->addTables( 'revision' );
  81                 $this->addFields( [
  82                         'page' => 'rev_page',
  83                         'anons' => 'COUNT(DISTINCT rev_user_text)',
  84                 ] );
  85                 $this->addWhereFld( 'rev_page', $pages );
  86                 $this->addWhere( 'rev_user = 0' );
  87                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
  88                 $this->addOption( 'GROUP BY', 'rev_page' );
  89                 $res = $this->select( __METHOD__ );
  90                 foreach ( $res as $row ) {
  91                         $fit = $result->addValue( [ 'query', 'pages', $row->page ],
  92                                 'anoncontributors', (int)$row->anons
  93                         );
  94                         if ( !$fit ) {
  95                                 // This not fitting isn't reasonable, so it probably means that
  96                                 // some other module used up all the space. Just set a dummy
  97                                 // continue and hope it works next time.
  98                                 $this->setContinueEnumParameter( 'continue',
  99                                         $params['continue'] !== null ? $params['continue'] : '0|0'
 100                                 );
 101
 102                                 return;
 103                         }
 104                 }
 105
 106                 // Next, add logged-in users
 107                 $this->resetQueryParams();
 108                 $this->addTables( 'revision' );
 109                 $this->addFields( [
 110                         'page' => 'rev_page',
 111                         'user' => 'rev_user',
 112                         'username' => 'MAX(rev_user_text)', // Non-MySQL databases don't like partial group-by
 113                 ] );
 114                 $this->addWhereFld( 'rev_page', $pages );
 115                 $this->addWhere( 'rev_user != 0' );
 116                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
 117                 $this->addOption( 'GROUP BY', 'rev_page, rev_user' );
 118                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 119
 120                 // Force a sort order to ensure that properties are grouped by page
 121                 // But only if pp_page is not constant in the WHERE clause.
 122                 if ( count( $pages ) > 1 ) {
 123                         $this->addOption( 'ORDER BY', 'rev_page, rev_user' );
 124                 } else {
 125                         $this->addOption( 'ORDER BY', 'rev_user' );
 126                 }
 127
 128                 $limitGroups = [];
 129                 if ( $params['group'] ) {
 130                         $excludeGroups = false;
 131                         $limitGroups = $params['group'];
 132                 } elseif ( $params['excludegroup'] ) {
 133                         $excludeGroups = true;
 134                         $limitGroups = $params['excludegroup'];
 135                 } elseif ( $params['rights'] ) {
 136                         $excludeGroups = false;
 137                         foreach ( $params['rights'] as $r ) {
 138                                 $limitGroups = array_merge( $limitGroups, User::getGroupsWithPermission( $r ) );
 139                         }
 140
 141                         // If no group has the rights requested, no need to query
 142                         if ( !$limitGroups ) {
 143                                 if ( $continuePages !== null ) {
 144                                         // But we still need to continue for the next page's worth
 145                                         // of anoncontributors
 146                                         $this->setContinueEnumParameter( 'continue', $continuePages );
 147                                 }
 148
 149                                 return;
 150                         }
 151                 } elseif ( $params['excluderights'] ) {
 152                         $excludeGroups = true;
 153                         foreach ( $params['excluderights'] as $r ) {
 154                                 $limitGroups = array_merge( $limitGroups, User::getGroupsWithPermission( $r ) );
 155                         }
 156                 }
 157
 158                 if ( $limitGroups ) {
 159                         $limitGroups = array_unique( $limitGroups );
 160                         $this->addTables( 'user_groups' );
 161                         $this->addJoinConds( [ 'user_groups' => [
 162                                 $excludeGroups ? 'LEFT OUTER JOIN' : 'INNER JOIN',
 163                                 [ 'ug_user=rev_user', 'ug_group' => $limitGroups ]
 164                         ] ] );
 165                         $this->addWhereIf( 'ug_user IS NULL', $excludeGroups );
 166                 }
 167
 168                 if ( $params['continue'] !== null ) {
 169                         $cont = explode( '|', $params['continue'] );
 170                         $this->dieContinueUsageIf( count( $cont ) != 2 );
 171                         $cont_page = (int)$cont[0];
 172                         $cont_user = (int)$cont[1];
 173                         $this->addWhere(
 174                                 "rev_page > $cont_page OR " .
 175                                 "(rev_page = $cont_page AND " .
 176                                 "rev_user >= $cont_user)"
 177                         );
 178                 }
 179
 180                 $res = $this->select( __METHOD__ );
 181                 $count = 0;
 182                 foreach ( $res as $row ) {
 183                         if ( ++$count > $params['limit'] ) {
 184                                 // We've reached the one extra which shows that
 185                                 // there are additional pages to be had. Stop here...
 186                                 $this->setContinueEnumParameter( 'continue', $row->page . '|' . $row->user );
 187
 188                                 return;
 189                         }
 190
 191                         $fit = $this->addPageSubItem( $row->page,
 192                                 [ 'userid' => (int)$row->user, 'name' => $row->username ],
 193                                 'user'
 194                         );
 195                         if ( !$fit ) {
 196                                 $this->setContinueEnumParameter( 'continue', $row->page . '|' . $row->user );
 197
 198                                 return;
 199                         }
 200                 }
 201
 202                 if ( $continuePages !== null ) {
 203                         $this->setContinueEnumParameter( 'continue', $continuePages );
 204                 }
 205         }
 206
 207         public function getCacheMode( $params ) {
 208                 return 'public';
 209         }
 210
 211         public function getAllowedParams() {
 212                 $userGroups = User::getAllGroups();
 213                 $userRights = User::getAllRights();
 214
 215                 return [
 216                         'group' => [
 217                                 ApiBase::PARAM_TYPE => $userGroups,
 218                                 ApiBase::PARAM_ISMULTI => true,
 219                         ],
 220                         'excludegroup' => [
 221                                 ApiBase::PARAM_TYPE => $userGroups,
 222                                 ApiBase::PARAM_ISMULTI => true,
 223                         ],
 224                         'rights' => [
 225                                 ApiBase::PARAM_TYPE => $userRights,
 226                                 ApiBase::PARAM_ISMULTI => true,
 227                         ],
 228                         'excluderights' => [
 229                                 ApiBase::PARAM_TYPE => $userRights,
 230                                 ApiBase::PARAM_ISMULTI => true,
 231                         ],
 232                         'limit' => [
 233                                 ApiBase::PARAM_DFLT => 10,
 234                                 ApiBase::PARAM_TYPE => 'limit',
 235                                 ApiBase::PARAM_MIN => 1,
 236                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 237                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 238                         ],
 239                         'continue' => [
 240                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 241                         ],
 242                 ];
 243         }
 244
 245         protected function getExamplesMessages() {
 246                 return [
 247                         'action=query&prop=contributors&titles=Main_Page'
 248                                 => 'apihelp-query+contributors-example-simple',
 249                 ];
 250         }
 251
 252         public function getHelpUrls() {
 253                 return 'https://www.mediawiki.org/wiki/API:Contributors';
 254         }
 255 }