WatchlistManager.php

Go to the documentation of this file.

<?php
 
namespace MediaWiki\Watchlist;
 
use DeferredUpdates;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageReference;
use MediaWiki\Page\WikiPageFactory;
use MediaWiki\Permissions\Authority;
use MediaWiki\Revision\RevisionLookup;
use MediaWiki\User\TalkPageNotificationManager;
use MediaWiki\User\UserFactory;
use MediaWiki\User\UserIdentity;
use NamespaceInfo;
use ReadOnlyMode;
use Status;
use StatusValue;
use TitleValue;
use User;
use WatchedItemStoreInterface;
use Wikimedia\ParamValidator\TypeDef\ExpiryDef;
 
class WatchlistManager {
 
    public const CONSTRUCTOR_OPTIONS = [
        'UseEnotif',
        'ShowUpdatedMarker',
    ];
 
    private $options;
 
    private $hookRunner;
 
    private $readOnlyMode;
 
    private $revisionLookup;
 
    private $talkPageNotificationManager;
 
    private $watchedItemStore;
 
    private $userFactory;
 
    private $nsInfo;
 
    private $wikiPageFactory;
 
    private $notificationTimestampCache = [];
 
    public function __construct(
        ServiceOptions $options,
        HookContainer $hookContainer,
        ReadOnlyMode $readOnlyMode,
        RevisionLookup $revisionLookup,
        TalkPageNotificationManager $talkPageNotificationManager,
        WatchedItemStoreInterface $watchedItemStore,
        UserFactory $userFactory,
        NamespaceInfo $nsInfo,
        WikiPageFactory $wikiPageFactory
    ) {
        $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
        $this->options = $options;
        $this->hookRunner = new HookRunner( $hookContainer );
        $this->readOnlyMode = $readOnlyMode;
        $this->revisionLookup = $revisionLookup;
        $this->talkPageNotificationManager = $talkPageNotificationManager;
        $this->watchedItemStore = $watchedItemStore;
        $this->userFactory = $userFactory;
        $this->nsInfo = $nsInfo;
        $this->wikiPageFactory = $wikiPageFactory;
    }
 
    public function clearAllUserNotifications( $performer ) {
        if ( $this->readOnlyMode->isReadOnly() ) {
            // Cannot change anything in read only
            return;
        }
 
        if ( !$performer instanceof Authority ) {
            $performer = $this->userFactory->newFromUserIdentity( $performer );
        }
 
        if ( !$performer->isAllowed( 'editmywatchlist' ) ) {
            // User isn't allowed to edit the watchlist
            return;
        }
 
        $user = $performer->getUser();
 
        if ( !$this->options->get( 'UseEnotif' ) &&
            !$this->options->get( 'ShowUpdatedMarker' )
        ) {
            $this->talkPageNotificationManager->removeUserHasNewMessages( $user );
            return;
        }
 
        $userId = $user->getId();
        if ( !$userId ) {
            return;
        }
 
        $this->watchedItemStore->resetAllNotificationTimestampsForUser( $user );
 
        // We also need to clear here the "you have new message" notification for the own
        // user_talk page; it's cleared one page view later in WikiPage::doViewUpdates().
    }
 
    public function clearTitleUserNotifications(
        $performer,
        $title,
        int $oldid = 0
    ) {
        if ( $this->readOnlyMode->isReadOnly() ) {
            // Cannot change anything in read only
            return;
        }
 
        if ( !$performer instanceof Authority ) {
            $performer = $this->userFactory->newFromUserIdentity( $performer );
        }
 
        if ( !$performer->isAllowed( 'editmywatchlist' ) ) {
            // User isn't allowed to edit the watchlist
            return;
        }
 
        $userIdentity = $performer->getUser();
        $userTalkPage = (
            $title->getNamespace() === NS_USER_TALK &&
            $title->getDBkey() === strtr( $userIdentity->getName(), ' ', '_' )
        );
 
        if ( $userTalkPage ) {
            // If we're working on user's talk page, we should update the talk page message indicator
            if ( !$this->hookRunner->onUserClearNewTalkNotification(
                $userIdentity,
                $oldid
            ) ) {
                return;
            }
 
            // Try to update the DB post-send and only if needed...
            $talkPageNotificationManager = $this->talkPageNotificationManager;
            $revisionLookup = $this->revisionLookup;
            DeferredUpdates::addCallableUpdate( static function () use (
                $userIdentity,
                $oldid,
                $talkPageNotificationManager,
                $revisionLookup
            ) {
                if ( !$talkPageNotificationManager->userHasNewMessages( $userIdentity ) ) {
                    // no notifications to clear
                    return;
                }
                // Delete the last notifications (they stack up)
                $talkPageNotificationManager->removeUserHasNewMessages( $userIdentity );
 
                // If there is a new, unseen, revision, use its timestamp
                if ( !$oldid ) {
                    return;
                }
 
                $oldRev = $revisionLookup->getRevisionById(
                    $oldid,
                    RevisionLookup::READ_LATEST
                );
                if ( !$oldRev ) {
                    return;
                }
 
                $newRev = $revisionLookup->getNextRevision( $oldRev );
                if ( $newRev ) {
                    $talkPageNotificationManager->setUserHasNewMessages(
                        $userIdentity,
                        $newRev
                    );
                }
            } );
        }
 
        if ( !$this->options->get( 'UseEnotif' ) &&
            !$this->options->get( 'ShowUpdatedMarker' )
        ) {
            return;
        }
 
        if ( !$userIdentity->isRegistered() ) {
            // Nothing else to do
            return;
        }
 
        // Only update the timestamp if the page is being watched.
        // The query to find out if it is watched is cached both in memcached and per-invocation,
        // and when it does have to be executed, it can be on a replica DB
        // If this is the user's newtalk page, we always update the timestamp
        $force = $userTalkPage ? 'force' : '';
        $this->watchedItemStore->resetNotificationTimestamp( $userIdentity, $title, $force, $oldid );
    }
 
    public function getTitleNotificationTimestamp( UserIdentity $user, $title ) {
        $userId = $user->getId();
 
        if ( !$userId ) {
            return false;
        }
 
        $cacheKey = 'u' . (string)$userId . '-' .
            (string)$title->getNamespace() . ':' . $title->getDBkey();
 
        // avoid isset here, as it'll return false for null entries
        if ( array_key_exists( $cacheKey, $this->notificationTimestampCache ) ) {
            return $this->notificationTimestampCache[ $cacheKey ];
        }
 
        $watchedItem = $this->watchedItemStore->getWatchedItem( $user, $title );
        if ( $watchedItem ) {
            $timestamp = $watchedItem->getNotificationTimestamp();
        } else {
            $timestamp = false;
        }
 
        $this->notificationTimestampCache[ $cacheKey ] = $timestamp;
        return $timestamp;
    }
 
    public function isWatchable( PageReference $target ): bool {
        if ( !$this->nsInfo->isWatchable( $target->getNamespace() ) ) {
            return false;
        }
 
        if ( $target instanceof PageIdentity && !$target->canExist() ) {
            // Catch "improper" Title instances
            return false;
        }
 
        return true;
    }
 
    public function isWatchedIgnoringRights( UserIdentity $userIdentity, PageIdentity $target ): bool {
        if ( $this->isWatchable( $target ) ) {
            return $this->watchedItemStore->isWatched( $userIdentity, $target );
        }
        return false;
    }
 
    public function isWatched( Authority $performer, PageIdentity $target ): bool {
        if ( $performer->isAllowed( 'viewmywatchlist' ) ) {
            return $this->isWatchedIgnoringRights( $performer->getUser(), $target );
        }
        return false;
    }
 
    public function isTempWatchedIgnoringRights( UserIdentity $userIdentity, PageIdentity $target ): bool {
        if ( $this->isWatchable( $target ) ) {
            return $this->watchedItemStore->isTempWatched( $userIdentity, $target );
        }
        return false;
    }
 
    public function isTempWatched( Authority $performer, PageIdentity $target ): bool {
        if ( $performer->isAllowed( 'viewmywatchlist' ) ) {
            return $this->isTempWatchedIgnoringRights( $performer->getUser(), $target );
        }
        return false;
    }
 
    public function addWatchIgnoringRights(
        UserIdentity $userIdentity,
        PageIdentity $target,
        ?string $expiry = null
    ): StatusValue {
        if ( !$this->isWatchable( $target ) ) {
            return StatusValue::newFatal( 'watchlistnotwatchable' );
        }
 
        $wikiPage = $this->wikiPageFactory->newFromTitle( $target );
        $title = $wikiPage->getTitle();
 
        // TODO: update hooks to take Authority
        $status = Status::newFatal( 'hookaborted' );
        $user = $this->userFactory->newFromUserIdentity( $userIdentity );
        if ( $this->hookRunner->onWatchArticle( $user, $wikiPage, $status, $expiry ) ) {
            $status = StatusValue::newGood();
            $this->watchedItemStore->addWatch( $userIdentity, $this->nsInfo->getSubjectPage( $title ), $expiry );
            if ( $this->nsInfo->canHaveTalkPage( $title ) ) {
                $this->watchedItemStore->addWatch( $userIdentity, $this->nsInfo->getTalkPage( $title ), $expiry );
            }
            $this->hookRunner->onWatchArticleComplete( $user, $wikiPage );
        }
 
        // eventually user_touched should be factored out of User and this should be replaced
        $user->invalidateCache();
 
        return $status;
    }
 
    public function addWatch(
        Authority $performer,
        PageIdentity $target,
        ?string $expiry = null
    ): StatusValue {
        if ( !$performer->isAllowed( 'editmywatchlist' ) ) {
            // TODO: this function should be moved out of User
            return User::newFatalPermissionDeniedStatus( 'editmywatchlist' );
        }
 
        return $this->addWatchIgnoringRights( $performer->getUser(), $target, $expiry );
    }
 
    public function removeWatchIgnoringRights(
        UserIdentity $userIdentity,
        PageIdentity $target
    ): StatusValue {
        if ( !$this->isWatchable( $target ) ) {
            return StatusValue::newFatal( 'watchlistnotwatchable' );
        }
 
        $wikiPage = $this->wikiPageFactory->newFromTitle( $target );
        $title = $wikiPage->getTitle();
 
        // TODO: update hooks to take Authority
        $status = Status::newFatal( 'hookaborted' );
        $user = $this->userFactory->newFromUserIdentity( $userIdentity );
        if ( $this->hookRunner->onUnwatchArticle( $user, $wikiPage, $status ) ) {
            $status = StatusValue::newGood();
            $this->watchedItemStore->removeWatch( $userIdentity, $this->nsInfo->getSubjectPage( $title ) );
            if ( $this->nsInfo->canHaveTalkPage( $title ) ) {
                $this->watchedItemStore->removeWatch( $userIdentity, $this->nsInfo->getTalkPage( $title ) );
            }
            $this->hookRunner->onUnwatchArticleComplete( $user, $wikiPage );
        }
 
        // eventually user_touched should be factored out of User and this should be replaced
        $user->invalidateCache();
 
        return $status;
    }
 
    public function removeWatch(
        Authority $performer,
        PageIdentity $target
    ): StatusValue {
        if ( !$performer->isAllowed( 'editmywatchlist' ) ) {
            // TODO: this function should be moved out of User
            return User::newFatalPermissionDeniedStatus( 'editmywatchlist' );
        }
 
        return $this->removeWatchIgnoringRights( $performer->getUser(), $target );
    }
 
    public function setWatch(
        bool $watch,
        Authority $performer,
        PageIdentity $target,
        string $expiry = null
    ): StatusValue {
        // User must be registered, and either changing the watch state or at least the expiry.
        if ( !$performer->getUser()->isRegistered() ) {
            return StatusValue::newGood();
        }
 
        // Only call addWatchhIgnoringRights() or removeWatch() if there's been a change in the watched status.
        $link = TitleValue::newFromPage( $target );
        $oldWatchedItem = $this->watchedItemStore->getWatchedItem( $performer->getUser(), $link );
        $changingWatchStatus = (bool)$oldWatchedItem !== $watch;
        if ( $oldWatchedItem && $expiry !== null ) {
            // If there's an old watched item, a non-null change to the expiry requires an UPDATE.
            $oldWatchPeriod = $oldWatchedItem->getExpiry() ?? 'infinity';
            $changingWatchStatus = $changingWatchStatus ||
                $oldWatchPeriod !== ExpiryDef::normalizeExpiry( $expiry, TS_MW );
        }
 
        if ( $changingWatchStatus ) {
            // If the user doesn't have 'editmywatchlist', we still want to
            // allow them to add but not remove items via edits and such.
            if ( $watch ) {
                return $this->addWatchIgnoringRights( $performer->getUser(), $target, $expiry );
            } else {
                return $this->removeWatch( $performer, $target );
            }
        }
 
        return StatusValue::newGood();
    }
}
 
class_alias( WatchlistManager::class, 'MediaWiki\User\WatchlistNotificationManager' );