includes/user/UserGroupMembership.php

   1 <?php
   2 /**
   3  * Represents the membership of a user to a user group.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use Wikimedia\Rdbms\IDatabase;
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Represents a "user group membership" -- a specific instance of a user belonging
  28  * to a group. For example, the fact that user Mary belongs to the sysop group is a
  29  * user group membership.
  30  *
  31  * The class encapsulates rows in the user_groups table. The logic is low-level and
  32  * doesn't run any hooks. Often, you will want to call User::addGroup() or
  33  * User::removeGroup() instead.
  34  *
  35  * @since 1.29
  36  */
  37 class UserGroupMembership {
  38         /** @var int The ID of the user who belongs to the group */
  39         private $userId;
  40
  41         /** @var string */
  42         private $group;
  43
  44         /** @var string|null Timestamp of expiry in TS_MW format, or null if no expiry */
  45         private $expiry;
  46
  47         /**
  48          * @param int $userId The ID of the user who belongs to the group
  49          * @param string $group The internal group name
  50          * @param string|null $expiry Timestamp of expiry in TS_MW format, or null if no expiry
  51          */
  52         public function __construct( $userId = 0, $group = null, $expiry = null ) {
  53                 $this->userId = (int)$userId;
  54                 $this->group = $group; // TODO throw on invalid group?
  55                 $this->expiry = $expiry ?: null;
  56         }
  57
  58         /**
  59          * @return int
  60          */
  61         public function getUserId() {
  62                 return $this->userId;
  63         }
  64
  65         /**
  66          * @return string
  67          */
  68         public function getGroup() {
  69                 return $this->group;
  70         }
  71
  72         /**
  73          * @return string|null Timestamp of expiry in TS_MW format, or null if no expiry
  74          */
  75         public function getExpiry() {
  76                 return $this->expiry;
  77         }
  78
  79         protected function initFromRow( $row ) {
  80                 $this->userId = (int)$row->ug_user;
  81                 $this->group = $row->ug_group;
  82                 $this->expiry = $row->ug_expiry === null ?
  83                         null :
  84                         wfTimestamp( TS_MW, $row->ug_expiry );
  85         }
  86
  87         /**
  88          * Creates a new UserGroupMembership object from a database row.
  89          *
  90          * @param stdClass $row The row from the user_groups table
  91          * @return UserGroupMembership
  92          */
  93         public static function newFromRow( $row ) {
  94                 $ugm = new self;
  95                 $ugm->initFromRow( $row );
  96                 return $ugm;
  97         }
  98
  99         /**
 100          * Returns the list of user_groups fields that should be selected to create
 101          * a new user group membership.
 102          * @return array
 103          */
 104         public static function selectFields() {
 105                 return [
 106                         'ug_user',
 107                         'ug_group',
 108                         'ug_expiry',
 109                 ];
 110         }
 111
 112         /**
 113          * Delete the row from the user_groups table.
 114          *
 115          * @throws MWException
 116          * @param IDatabase|null $dbw Optional master database connection to use
 117          * @return bool Whether or not anything was deleted
 118          */
 119         public function delete( IDatabase $dbw = null ) {
 120                 if ( wfReadOnly() ) {
 121                         return false;
 122                 }
 123
 124                 if ( $dbw === null ) {
 125                         $dbw = wfGetDB( DB_MASTER );
 126                 }
 127
 128                 $dbw->delete(
 129                         'user_groups',
 130                         [ 'ug_user' => $this->userId, 'ug_group' => $this->group ],
 131                         __METHOD__ );
 132                 if ( !$dbw->affectedRows() ) {
 133                         return false;
 134                 }
 135
 136                 // Remember that the user was in this group
 137                 $dbw->insert(
 138                         'user_former_groups',
 139                         [ 'ufg_user' => $this->userId, 'ufg_group' => $this->group ],
 140                         __METHOD__,
 141                         [ 'IGNORE' ] );
 142
 143                 return true;
 144         }
 145
 146         /**
 147          * Insert a user right membership into the database. When $allowUpdate is false,
 148          * the function fails if there is a conflicting membership entry (same user and
 149          * group) already in the table.
 150          *
 151          * @throws MWException
 152          * @param bool $allowUpdate Whether to perform "upsert" instead of INSERT
 153          * @param IDatabase|null $dbw If you have one available
 154          * @return bool Whether or not anything was inserted
 155          */
 156         public function insert( $allowUpdate = false, IDatabase $dbw = null ) {
 157                 if ( $dbw === null ) {
 158                         $dbw = wfGetDB( DB_MASTER );
 159                 }
 160
 161                 // Purge old, expired memberships from the DB
 162                 JobQueueGroup::singleton()->push( new UserGroupExpiryJob() );
 163
 164                 // Check that the values make sense
 165                 if ( $this->group === null ) {
 166                         throw new UnexpectedValueException(
 167                                 'Don\'t try inserting an uninitialized UserGroupMembership object' );
 168                 } elseif ( $this->userId <= 0 ) {
 169                         throw new UnexpectedValueException(
 170                                 'UserGroupMembership::insert() needs a positive user ID. ' .
 171                                 'Did you forget to add your User object to the database before calling addGroup()?' );
 172                 }
 173
 174                 $row = $this->getDatabaseArray( $dbw );
 175                 $dbw->insert( 'user_groups', $row, __METHOD__, [ 'IGNORE' ] );
 176                 $affected = $dbw->affectedRows();
 177
 178                 // Don't collide with expired user group memberships
 179                 // Do this after trying to insert, in order to avoid locking
 180                 if ( !$affected ) {
 181                         $conds = [
 182                                 'ug_user' => $row['ug_user'],
 183                                 'ug_group' => $row['ug_group'],
 184                         ];
 185                         // if we're unconditionally updating, check that the expiry is not already the
 186                         // same as what we are trying to update it to; otherwise, only update if
 187                         // the expiry date is in the past
 188                         if ( $allowUpdate ) {
 189                                 if ( $this->expiry ) {
 190                                         $conds[] = 'ug_expiry IS NULL OR ug_expiry != ' .
 191                                                 $dbw->addQuotes( $dbw->timestamp( $this->expiry ) );
 192                                 } else {
 193                                         $conds[] = 'ug_expiry IS NOT NULL';
 194                                 }
 195                         } else {
 196                                 $conds[] = 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp() );
 197                         }
 198
 199                         $row = $dbw->selectRow( 'user_groups', $this::selectFields(), $conds, __METHOD__ );
 200                         if ( $row ) {
 201                                 $dbw->update(
 202                                         'user_groups',
 203                                         [ 'ug_expiry' => $this->expiry ? $dbw->timestamp( $this->expiry ) : null ],
 204                                         [ 'ug_user' => $row->ug_user, 'ug_group' => $row->ug_group ],
 205                                         __METHOD__ );
 206                                 $affected = $dbw->affectedRows();
 207                         }
 208                 }
 209
 210                 return $affected > 0;
 211         }
 212
 213         /**
 214          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 215          * @param IDatabase $db
 216          * @return array
 217          */
 218         protected function getDatabaseArray( IDatabase $db ) {
 219                 return [
 220                         'ug_user' => $this->userId,
 221                         'ug_group' => $this->group,
 222                         'ug_expiry' => $this->expiry ? $db->timestamp( $this->expiry ) : null,
 223                 ];
 224         }
 225
 226         /**
 227          * Has the membership expired?
 228          * @return bool
 229          */
 230         public function isExpired() {
 231                 if ( !$this->expiry ) {
 232                         return false;
 233                 } else {
 234                         return wfTimestampNow() > $this->expiry;
 235                 }
 236         }
 237
 238         /**
 239          * Purge expired memberships from the user_groups table
 240          */
 241         public static function purgeExpired() {
 242                 $services = MediaWikiServices::getInstance();
 243                 if ( $services->getReadOnlyMode()->isReadOnly() ) {
 244                         return;
 245                 }
 246
 247                 $lbFactory = $services->getDBLoadBalancerFactory();
 248                 $ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ );
 249                 $dbw = $services->getDBLoadBalancer()->getConnection( DB_MASTER );
 250
 251                 $lockKey = $dbw->getDomainID() . ':usergroups-prune'; // specific to this wiki
 252                 $scopedLock = $dbw->getScopedLockAndFlush( $lockKey, __METHOD__, 0 );
 253                 if ( !$scopedLock ) {
 254                         return; // already running
 255                 }
 256
 257                 $now = time();
 258                 do {
 259                         $dbw->startAtomic( __METHOD__ );
 260
 261                         $res = $dbw->select(
 262                                 'user_groups',
 263                                 self::selectFields(),
 264                                 [ 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp( $now ) ) ],
 265                                 __METHOD__,
 266                                 [ 'FOR UPDATE', 'LIMIT' => 100 ]
 267                         );
 268
 269                         if ( $res->numRows() > 0 ) {
 270                                 $insertData = []; // array of users/groups to insert to user_former_groups
 271                                 $deleteCond = []; // array for deleting the rows that are to be moved around
 272                                 foreach ( $res as $row ) {
 273                                         $insertData[] = [ 'ufg_user' => $row->ug_user, 'ufg_group' => $row->ug_group ];
 274                                         $deleteCond[] = $dbw->makeList(
 275                                                 [ 'ug_user' => $row->ug_user, 'ug_group' => $row->ug_group ],
 276                                                 $dbw::LIST_AND
 277                                         );
 278                                 }
 279                                 // Delete the rows we're about to move
 280                                 $dbw->delete(
 281                                         'user_groups',
 282                                         $dbw->makeList( $deleteCond, $dbw::LIST_OR ),
 283                                         __METHOD__
 284                                 );
 285                                 // Push the groups to user_former_groups
 286                                 $dbw->insert( 'user_former_groups', $insertData, __METHOD__, [ 'IGNORE' ] );
 287                         }
 288
 289                         $dbw->endAtomic( __METHOD__ );
 290
 291                         $lbFactory->commitAndWaitForReplication( __METHOD__, $ticket );
 292                 } while ( $res->numRows() > 0 );
 293         }
 294
 295         /**
 296          * Returns UserGroupMembership objects for all the groups a user currently
 297          * belongs to.
 298          *
 299          * @param int $userId ID of the user to search for
 300          * @param IDatabase|null $db Optional database connection
 301          * @return UserGroupMembership[] Associative array of (group name => UserGroupMembership object)
 302          */
 303         public static function getMembershipsForUser( $userId, IDatabase $db = null ) {
 304                 if ( !$db ) {
 305                         $db = wfGetDB( DB_REPLICA );
 306                 }
 307
 308                 $res = $db->select( 'user_groups',
 309                         self::selectFields(),
 310                         [ 'ug_user' => $userId ],
 311                         __METHOD__ );
 312
 313                 $ugms = [];
 314                 foreach ( $res as $row ) {
 315                         $ugm = self::newFromRow( $row );
 316                         if ( !$ugm->isExpired() ) {
 317                                 $ugms[$ugm->group] = $ugm;
 318                         }
 319                 }
 320
 321                 return $ugms;
 322         }
 323
 324         /**
 325          * Returns a UserGroupMembership object that pertains to the given user and group,
 326          * or false if the user does not belong to that group (or the assignment has
 327          * expired).
 328          *
 329          * @param int $userId ID of the user to search for
 330          * @param string $group User group name
 331          * @param IDatabase|null $db Optional database connection
 332          * @return UserGroupMembership|false
 333          */
 334         public static function getMembership( $userId, $group, IDatabase $db = null ) {
 335                 if ( !$db ) {
 336                         $db = wfGetDB( DB_REPLICA );
 337                 }
 338
 339                 $row = $db->selectRow( 'user_groups',
 340                         self::selectFields(),
 341                         [ 'ug_user' => $userId, 'ug_group' => $group ],
 342                         __METHOD__ );
 343                 if ( !$row ) {
 344                         return false;
 345                 }
 346
 347                 $ugm = self::newFromRow( $row );
 348                 if ( !$ugm->isExpired() ) {
 349                         return $ugm;
 350                 } else {
 351                         return false;
 352                 }
 353         }
 354
 355         /**
 356          * Gets a link for a user group, possibly including the expiry date if relevant.
 357          *
 358          * @param string|UserGroupMembership $ugm Either a group name as a string, or
 359          *   a UserGroupMembership object
 360          * @param IContextSource $context
 361          * @param string $format Either 'wiki' or 'html'
 362          * @param string|null $userName If you want to use the group member message
 363          *   ("administrator"), pass the name of the user who belongs to the group; it
 364          *   is used for GENDER of the group member message. If you instead want the
 365          *   group name message ("Administrators"), omit this parameter.
 366          * @return string
 367          */
 368         public static function getLink( $ugm, IContextSource $context, $format,
 369                 $userName = null
 370         ) {
 371                 if ( $format !== 'wiki' && $format !== 'html' ) {
 372                         throw new MWException( 'UserGroupMembership::getLink() $format parameter should be ' .
 373                                 "'wiki' or 'html'" );
 374                 }
 375
 376                 if ( $ugm instanceof UserGroupMembership ) {
 377                         $expiry = $ugm->getExpiry();
 378                         $group = $ugm->getGroup();
 379                 } else {
 380                         $expiry = null;
 381                         $group = $ugm;
 382                 }
 383
 384                 if ( $userName !== null ) {
 385                         $groupName = self::getGroupMemberName( $group, $userName );
 386                 } else {
 387                         $groupName = self::getGroupName( $group );
 388                 }
 389
 390                 // link to the group description page, if it exists
 391                 $linkTitle = self::getGroupPage( $group );
 392                 if ( $linkTitle ) {
 393                         if ( $format === 'wiki' ) {
 394                                 $linkPage = $linkTitle->getFullText();
 395                                 $groupLink = "[[$linkPage|$groupName]]";
 396                         } else {
 397                                 $groupLink = Linker::link( $linkTitle, htmlspecialchars( $groupName ) );
 398                         }
 399                 } else {
 400                         $groupLink = htmlspecialchars( $groupName );
 401                 }
 402
 403                 if ( $expiry ) {
 404                         // format the expiry to a nice string
 405                         $uiLanguage = $context->getLanguage();
 406                         $uiUser = $context->getUser();
 407                         $expiryDT = $uiLanguage->userTimeAndDate( $expiry, $uiUser );
 408                         $expiryD = $uiLanguage->userDate( $expiry, $uiUser );
 409                         $expiryT = $uiLanguage->userTime( $expiry, $uiUser );
 410                         if ( $format === 'html' ) {
 411                                 $groupLink = Message::rawParam( $groupLink );
 412                         }
 413                         return $context->msg( 'group-membership-link-with-expiry' )
 414                                 ->params( $groupLink, $expiryDT, $expiryD, $expiryT )->text();
 415                 } else {
 416                         return $groupLink;
 417                 }
 418         }
 419
 420         /**
 421          * Gets the localized friendly name for a group, if it exists. For example,
 422          * "Administrators" or "Bureaucrats"
 423          *
 424          * @param string $group Internal group name
 425          * @return string Localized friendly group name
 426          */
 427         public static function getGroupName( $group ) {
 428                 $msg = wfMessage( "group-$group" );
 429                 return $msg->isBlank() ? $group : $msg->text();
 430         }
 431
 432         /**
 433          * Gets the localized name for a member of a group, if it exists. For example,
 434          * "administrator" or "bureaucrat"
 435          *
 436          * @param string $group Internal group name
 437          * @param string $username Username for gender
 438          * @return string Localized name for group member
 439          */
 440         public static function getGroupMemberName( $group, $username ) {
 441                 $msg = wfMessage( "group-$group-member", $username );
 442                 return $msg->isBlank() ? $group : $msg->text();
 443         }
 444
 445         /**
 446          * Gets the title of a page describing a particular user group. When the name
 447          * of the group appears in the UI, it can link to this page.
 448          *
 449          * @param string $group Internal group name
 450          * @return Title|bool Title of the page if it exists, false otherwise
 451          */
 452         public static function getGroupPage( $group ) {
 453                 $msg = wfMessage( "grouppage-$group" )->inContentLanguage();
 454                 if ( $msg->exists() ) {
 455                         $title = Title::newFromText( $msg->text() );
 456                         if ( is_object( $title ) ) {
 457                                 return $title;
 458                         }
 459                 }
 460                 return false;
 461         }
 462 }