--- /dev/null
+<?php
+/**
+ * Represents the membership of a user to a user group.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+use Wikimedia\Rdbms\IDatabase;
+
+/**
+ * Represents a "user group membership" -- a specific instance of a user belonging
+ * to a group. For example, the fact that user Mary belongs to the sysop group is a
+ * user group membership.
+ *
+ * The class encapsulates rows in the user_groups table. The logic is low-level and
+ * doesn't run any hooks. Often, you will want to call User::addGroup() or
+ * User::removeGroup() instead.
+ *
+ * @since 1.29
+ */
+class UserGroupMembership {
+ /** @var int The ID of the user who belongs to the group */
+ private $userId;
+
+ /** @var string */
+ private $group;
+
+ /** @var string|null Timestamp of expiry in TS_MW format, or null if no expiry */
+ private $expiry;
+
+ /**
+ * @param int $userId The ID of the user who belongs to the group
+ * @param string $group The internal group name
+ * @param string|null $expiry Timestamp of expiry in TS_MW format, or null if no expiry
+ */
+ public function __construct( $userId = 0, $group = null, $expiry = null ) {
+ $this->userId = (int)$userId;
+ $this->group = $group; // TODO throw on invalid group?
+ $this->expiry = $expiry ?: null;
+ }
+
+ /**
+ * @return int
+ */
+ public function getUserId() {
+ return $this->userId;
+ }
+
+ /**
+ * @return string
+ */
+ public function getGroup() {
+ return $this->group;
+ }
+
+ /**
+ * @return string|null Timestamp of expiry in TS_MW format, or null if no expiry
+ */
+ public function getExpiry() {
+ return $this->expiry;
+ }
+
+ protected function initFromRow( $row ) {
+ $this->userId = (int)$row->ug_user;
+ $this->group = $row->ug_group;
+ $this->expiry = $row->ug_expiry === null ?
+ null :
+ wfTimestamp( TS_MW, $row->ug_expiry );
+ }
+
+ /**
+ * Creates a new UserGroupMembership object from a database row.
+ *
+ * @param stdClass $row The row from the user_groups table
+ * @return UserGroupMembership
+ */
+ public static function newFromRow( $row ) {
+ $ugm = new self;
+ $ugm->initFromRow( $row );
+ return $ugm;
+ }
+
+ /**
+ * Returns the list of user_groups fields that should be selected to create
+ * a new user group membership.
+ * @return array
+ */
+ public static function selectFields() {
+ return [
+ 'ug_user',
+ 'ug_group',
+ 'ug_expiry',
+ ];
+ }
+
+ /**
+ * Delete the row from the user_groups table.
+ *
+ * @throws MWException
+ * @param IDatabase|null $dbw Optional master database connection to use
+ * @return bool Whether or not anything was deleted
+ */
+ public function delete( IDatabase $dbw = null ) {
+ if ( wfReadOnly() ) {
+ return false;
+ }
+
+ if ( $dbw === null ) {
+ $dbw = wfGetDB( DB_MASTER );
+ }
+
+ $dbw->delete(
+ 'user_groups',
+ [ 'ug_user' => $this->userId, 'ug_group' => $this->group ],
+ __METHOD__ );
+ if ( !$dbw->affectedRows() ) {
+ return false;
+ }
+
+ // Remember that the user was in this group
+ $dbw->insert(
+ 'user_former_groups',
+ [ 'ufg_user' => $this->userId, 'ufg_group' => $this->group ],
+ __METHOD__,
+ [ 'IGNORE' ] );
+
+ return true;
+ }
+
+ /**
+ * Insert a user right membership into the database. When $allowUpdate is false,
+ * the function fails if there is a conflicting membership entry (same user and
+ * group) already in the table.
+ *
+ * @throws MWException
+ * @param bool $allowUpdate Whether to perform "upsert" instead of INSERT
+ * @param IDatabase|null $dbw If you have one available
+ * @return bool Whether or not anything was inserted
+ */
+ public function insert( $allowUpdate = false, IDatabase $dbw = null ) {
+ if ( $dbw === null ) {
+ $dbw = wfGetDB( DB_MASTER );
+ }
+
+ // Purge old, expired memberships from the DB
+ self::purgeExpired( $dbw );
+
+ // Check that the values make sense
+ if ( $this->group === null ) {
+ throw new UnexpectedValueException(
+ 'Don\'t try inserting an uninitialized UserGroupMembership object' );
+ } elseif ( $this->userId <= 0 ) {
+ throw new UnexpectedValueException(
+ 'UserGroupMembership::insert() needs a positive user ID. ' .
+ 'Did you forget to add your User object to the database before calling addGroup()?' );
+ }
+
+ $row = $this->getDatabaseArray( $dbw );
+ $dbw->insert( 'user_groups', $row, __METHOD__, [ 'IGNORE' ] );
+ $affected = $dbw->affectedRows();
+
+ // Don't collide with expired user group memberships
+ // Do this after trying to insert, in order to avoid locking
+ if ( !$affected ) {
+ $conds = [
+ 'ug_user' => $row['ug_user'],
+ 'ug_group' => $row['ug_group'],
+ ];
+ // if we're unconditionally updating, check that the expiry is not already the
+ // same as what we are trying to update it to; otherwise, only update if
+ // the expiry date is in the past
+ if ( $allowUpdate ) {
+ if ( $this->expiry ) {
+ $conds[] = 'ug_expiry IS NULL OR ug_expiry != ' .
+ $dbw->addQuotes( $dbw->timestamp( $this->expiry ) );
+ } else {
+ $conds[] = 'ug_expiry IS NOT NULL';
+ }
+ } else {
+ $conds[] = 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp() );
+ }
+
+ $row = $dbw->selectRow( 'user_groups', $this::selectFields(), $conds, __METHOD__ );
+ if ( $row ) {
+ $dbw->update(
+ 'user_groups',
+ [ 'ug_expiry' => $this->expiry ? $dbw->timestamp( $this->expiry ) : null ],
+ [ 'ug_user' => $row->ug_user, 'ug_group' => $row->ug_group ],
+ __METHOD__ );
+ $affected = $dbw->affectedRows();
+ }
+ }
+
+ return $affected > 0;
+ }
+
+ /**
+ * Get an array suitable for passing to $dbw->insert() or $dbw->update()
+ * @param IDatabase $db
+ * @return array
+ */
+ protected function getDatabaseArray( IDatabase $db ) {
+ return [
+ 'ug_user' => $this->userId,
+ 'ug_group' => $this->group,
+ 'ug_expiry' => $this->expiry ? $db->timestamp( $this->expiry ) : null,
+ ];
+ }
+
+ /**
+ * Has the membership expired?
+ * @return bool
+ */
+ public function isExpired() {
+ if ( !$this->expiry ) {
+ return false;
+ } else {
+ return wfTimestampNow() > $this->expiry;
+ }
+ }
+
+ /**
+ * Purge expired memberships from the user_groups table
+ *
+ * @param IDatabase|null $dbw
+ */
+ public static function purgeExpired( IDatabase $dbw = null ) {
+ if ( wfReadOnly() ) {
+ return;
+ }
+
+ if ( $dbw === null ) {
+ $dbw = wfGetDB( DB_MASTER );
+ }
+
+ DeferredUpdates::addUpdate( new AtomicSectionUpdate(
+ $dbw,
+ __METHOD__,
+ function ( IDatabase $dbw, $fname ) {
+ $expiryCond = [ 'ug_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ];
+ $res = $dbw->select( 'user_groups', self::selectFields(), $expiryCond, $fname );
+
+ // save an array of users/groups to insert to user_former_groups
+ $usersAndGroups = [];
+ foreach ( $res as $row ) {
+ $usersAndGroups[] = [ 'ufg_user' => $row->ug_user, 'ufg_group' => $row->ug_group ];
+ }
+
+ // delete 'em all
+ $dbw->delete( 'user_groups', $expiryCond, $fname );
+
+ // and push the groups to user_former_groups
+ $dbw->insert( 'user_former_groups', $usersAndGroups, __METHOD__, [ 'IGNORE' ] );
+ }
+ ) );
+ }
+
+ /**
+ * Returns UserGroupMembership objects for all the groups a user currently
+ * belongs to.
+ *
+ * @param int $userId ID of the user to search for
+ * @param IDatabase|null $db Optional database connection
+ * @return array Associative array of (group name => UserGroupMembership object)
+ */
+ public static function getMembershipsForUser( $userId, IDatabase $db = null ) {
+ if ( !$db ) {
+ $db = wfGetDB( DB_REPLICA );
+ }
+
+ $res = $db->select( 'user_groups',
+ self::selectFields(),
+ [ 'ug_user' => $userId ],
+ __METHOD__ );
+
+ $ugms = [];
+ foreach ( $res as $row ) {
+ $ugm = self::newFromRow( $row );
+ if ( !$ugm->isExpired() ) {
+ $ugms[$ugm->group] = $ugm;
+ }
+ }
+
+ return $ugms;
+ }
+
+ /**
+ * Returns a UserGroupMembership object that pertains to the given user and group,
+ * or false if the user does not belong to that group (or the assignment has
+ * expired).
+ *
+ * @param int $userId ID of the user to search for
+ * @param string $group User group name
+ * @param IDatabase|null $db Optional database connection
+ * @return UserGroupMembership|false
+ */
+ public static function getMembership( $userId, $group, IDatabase $db = null ) {
+ if ( !$db ) {
+ $db = wfGetDB( DB_REPLICA );
+ }
+
+ $row = $db->selectRow( 'user_groups',
+ self::selectFields(),
+ [ 'ug_user' => $userId, 'ug_group' => $group ],
+ __METHOD__ );
+ if ( !$row ) {
+ return false;
+ }
+
+ $ugm = self::newFromRow( $row );
+ if ( !$ugm->isExpired() ) {
+ return $ugm;
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Gets a link for a user group, possibly including the expiry date if relevant.
+ *
+ * @param string|UserGroupMembership $ugm Either a group name as a string, or
+ * a UserGroupMembership object
+ * @param IContextSource $context
+ * @param string $format Either 'wiki' or 'html'
+ * @param string|null $userName If you want to use the group member message
+ * ("administrator"), pass the name of the user who belongs to the group; it
+ * is used for GENDER of the group member message. If you instead want the
+ * group name message ("Administrators"), omit this parameter.
+ * @return string
+ */
+ public static function getLink( $ugm, IContextSource $context, $format,
+ $userName = null
+ ) {
+ if ( $format !== 'wiki' && $format !== 'html' ) {
+ throw new MWException( 'UserGroupMembership::getLink() $format parameter should be ' .
+ "'wiki' or 'html'" );
+ }
+
+ if ( $ugm instanceof UserGroupMembership ) {
+ $expiry = $ugm->getExpiry();
+ $group = $ugm->getGroup();
+ } else {
+ $expiry = null;
+ $group = $ugm;
+ }
+
+ if ( $userName !== null ) {
+ $groupName = self::getGroupMemberName( $group, $userName );
+ } else {
+ $groupName = self::getGroupName( $group );
+ }
+
+ // link to the group description page, if it exists
+ $linkTitle = self::getGroupPage( $group );
+ if ( $linkTitle ) {
+ if ( $format === 'wiki' ) {
+ $linkPage = $linkTitle->getFullText();
+ $groupLink = "[[$linkPage|$groupName]]";
+ } else {
+ $groupLink = Linker::link( $linkTitle, htmlspecialchars( $groupName ) );
+ }
+ } else {
+ $groupLink = htmlspecialchars( $groupName );
+ }
+
+ if ( $expiry ) {
+ // format the expiry to a nice string
+ $uiLanguage = $context->getLanguage();
+ $uiUser = $context->getUser();
+ $expiryDT = $uiLanguage->userTimeAndDate( $expiry, $uiUser );
+ $expiryD = $uiLanguage->userDate( $expiry, $uiUser );
+ $expiryT = $uiLanguage->userTime( $expiry, $uiUser );
+ if ( $format === 'html' ) {
+ $groupLink = Message::rawParam( $groupLink );
+ }
+ return $context->msg( 'group-membership-link-with-expiry' )
+ ->params( $groupLink, $expiryDT, $expiryD, $expiryT )->text();
+ } else {
+ return $groupLink;
+ }
+ }
+
+ /**
+ * Gets the localized friendly name for a group, if it exists. For example,
+ * "Administrators" or "Bureaucrats"
+ *
+ * @param string $group Internal group name
+ * @return string Localized friendly group name
+ */
+ public static function getGroupName( $group ) {
+ $msg = wfMessage( "group-$group" );
+ return $msg->isBlank() ? $group : $msg->text();
+ }
+
+ /**
+ * Gets the localized name for a member of a group, if it exists. For example,
+ * "administrator" or "bureaucrat"
+ *
+ * @param string $group Internal group name
+ * @param string $username Username for gender
+ * @return string Localized name for group member
+ */
+ public static function getGroupMemberName( $group, $username ) {
+ $msg = wfMessage( "group-$group-member", $username );
+ return $msg->isBlank() ? $group : $msg->text();
+ }
+
+ /**
+ * Gets the title of a page describing a particular user group. When the name
+ * of the group appears in the UI, it can link to this page.
+ *
+ * @param string $group Internal group name
+ * @return Title|bool Title of the page if it exists, false otherwise
+ */
+ public static function getGroupPage( $group ) {
+ $msg = wfMessage( "grouppage-$group" )->inContentLanguage();
+ if ( $msg->exists() ) {
+ $title = Title::newFromText( $msg->text() );
+ if ( is_object( $title ) ) {
+ return $title;
+ }
+ }
+ return false;
+ }
+}
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