Move remaining LoadBalancer classes to Rdbms

[mediawiki.git] / includes / specials / SpecialWatchlist.php

<?php
/**
 * Implements Special:Watchlist
 *
 * 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
 * @ingroup SpecialPage
 */

use MediaWiki\MediaWikiServices;

/**
 * A special page that lists last changes made to the wiki,
 * limited to user-defined list of titles.
 *
 * @ingroup SpecialPage
 */
class SpecialWatchlist extends ChangesListSpecialPage {
        public function __construct( $page = 'Watchlist', $restriction = 'viewmywatchlist' ) {
                parent::__construct( $page, $restriction );
        }

        public function doesWrites() {
                return true;
        }

        /**
         * Main execution point
         *
         * @param string $subpage
         */
        function execute( $subpage ) {
                // Anons don't get a watchlist
                $this->requireLogin( 'watchlistanontext' );

                $output = $this->getOutput();
                $request = $this->getRequest();
                $this->addHelpLink( 'Help:Watching pages' );
                $output->addModules( [
                        'mediawiki.special.changeslist.visitedstatus',
                        'mediawiki.special.watchlist',
                ] );

                $mode = SpecialEditWatchlist::getMode( $request, $subpage );
                if ( $mode !== false ) {
                        if ( $mode === SpecialEditWatchlist::EDIT_RAW ) {
                                $title = SpecialPage::getTitleFor( 'EditWatchlist', 'raw' );
                        } elseif ( $mode === SpecialEditWatchlist::EDIT_CLEAR ) {
                                $title = SpecialPage::getTitleFor( 'EditWatchlist', 'clear' );
                        } else {
                                $title = SpecialPage::getTitleFor( 'EditWatchlist' );
                        }

                        $output->redirect( $title->getLocalURL() );

                        return;
                }

                $this->checkPermissions();

                $user = $this->getUser();
                $opts = $this->getOptions();

                $config = $this->getConfig();
                if ( ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) )
                        && $request->getVal( 'reset' )
                        && $request->wasPosted()
                ) {
                        $user->clearAllNotifications();
                        $output->redirect( $this->getPageTitle()->getFullURL( $opts->getChangedValues() ) );

                        return;
                }

                parent::execute( $subpage );
        }

        /**
         * Return an array of subpages that this special page will accept.
         *
         * @see also SpecialEditWatchlist::getSubpagesForPrefixSearch
         * @return string[] subpages
         */
        public function getSubpagesForPrefixSearch() {
                return [
                        'clear',
                        'edit',
                        'raw',
                ];
        }

        /**
         * Get a FormOptions object containing the default options
         *
         * @return FormOptions
         */
        public function getDefaultOptions() {
                $opts = parent::getDefaultOptions();
                $user = $this->getUser();

                $opts->add( 'days', $user->getOption( 'watchlistdays' ), FormOptions::FLOAT );
                $opts->add( 'extended', $user->getBoolOption( 'extendwatchlist' ) );
                if ( $this->getRequest()->getVal( 'action' ) == 'submit' ) {
                        // The user has submitted the form, so we dont need the default values
                        return $opts;
                }

                $opts->add( 'hideminor', $user->getBoolOption( 'watchlisthideminor' ) );
                $opts->add( 'hidebots', $user->getBoolOption( 'watchlisthidebots' ) );
                $opts->add( 'hideanons', $user->getBoolOption( 'watchlisthideanons' ) );
                $opts->add( 'hideliu', $user->getBoolOption( 'watchlisthideliu' ) );
                $opts->add( 'hidepatrolled', $user->getBoolOption( 'watchlisthidepatrolled' ) );
                $opts->add( 'hidemyself', $user->getBoolOption( 'watchlisthideown' ) );
                $opts->add( 'hidecategorization', $user->getBoolOption( 'watchlisthidecategorization' ) );

                return $opts;
        }

        /**
         * Get all custom filters
         *
         * @return array Map of filter URL param names to properties (msg/default)
         */
        protected function getCustomFilters() {
                if ( $this->customFilters === null ) {
                        $this->customFilters = parent::getCustomFilters();
                        Hooks::run( 'SpecialWatchlistFilters', [ $this, &$this->customFilters ], '1.23' );
                }

                return $this->customFilters;
        }

        /**
         * Fetch values for a FormOptions object from the WebRequest associated with this instance.
         *
         * Maps old pre-1.23 request parameters Watchlist used to use (different from Recentchanges' ones)
         * to the current ones.
         *
         * @param FormOptions $opts
         * @return FormOptions
         */
        protected function fetchOptionsFromRequest( $opts ) {
                static $compatibilityMap = [
                        'hideMinor' => 'hideminor',
                        'hideBots' => 'hidebots',
                        'hideAnons' => 'hideanons',
                        'hideLiu' => 'hideliu',
                        'hidePatrolled' => 'hidepatrolled',
                        'hideOwn' => 'hidemyself',
                ];

                $params = $this->getRequest()->getValues();
                foreach ( $compatibilityMap as $from => $to ) {
                        if ( isset( $params[$from] ) ) {
                                $params[$to] = $params[$from];
                                unset( $params[$from] );
                        }
                }

                // Not the prettiest way to achieve this… FormOptions internally depends on data sanitization
                // methods defined on WebRequest and removing this dependency would cause some code duplication.
                $request = new DerivativeRequest( $this->getRequest(), $params );
                $opts->fetchValuesFromRequest( $request );

                return $opts;
        }

        /**
         * Return an array of conditions depending of options set in $opts
         *
         * @param FormOptions $opts
         * @return array
         */
        public function buildMainQueryConds( FormOptions $opts ) {
                $dbr = $this->getDB();
                $conds = parent::buildMainQueryConds( $opts );

                // Calculate cutoff
                if ( $opts['days'] > 0 ) {
                        $conds[] = 'rc_timestamp > ' .
                                $dbr->addQuotes( $dbr->timestamp( time() - intval( $opts['days'] * 86400 ) ) );
                }

                return $conds;
        }

        /**
         * Process the query
         *
         * @param array $conds
         * @param FormOptions $opts
         * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
         */
        public function doMainQuery( $conds, $opts ) {
                $dbr = $this->getDB();
                $user = $this->getUser();

                # Toggle watchlist content (all recent edits or just the latest)
                if ( $opts['extended'] ) {
                        $limitWatchlist = $user->getIntOption( 'wllimit' );
                        $usePage = false;
                } else {
                        # Top log Ids for a page are not stored
                        $nonRevisionTypes = [ RC_LOG ];
                        Hooks::run( 'SpecialWatchlistGetNonRevisionTypes', [ &$nonRevisionTypes ] );
                        if ( $nonRevisionTypes ) {
                                $conds[] = $dbr->makeList(
                                        [
                                                'rc_this_oldid=page_latest',
                                                'rc_type' => $nonRevisionTypes,
                                        ],
                                        LIST_OR
                                );
                        }
                        $limitWatchlist = 0;
                        $usePage = true;
                }

                $tables = [ 'recentchanges', 'watchlist' ];
                $fields = RecentChange::selectFields();
                $query_options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
                $join_conds = [
                        'watchlist' => [
                                'INNER JOIN',
                                [
                                        'wl_user' => $user->getId(),
                                        'wl_namespace=rc_namespace',
                                        'wl_title=rc_title'
                                ],
                        ],
                ];

                if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
                        $fields[] = 'wl_notificationtimestamp';
                }
                if ( $limitWatchlist ) {
                        $query_options['LIMIT'] = $limitWatchlist;
                }

                $rollbacker = $user->isAllowed( 'rollback' );
                if ( $usePage || $rollbacker ) {
                        $tables[] = 'page';
                        $join_conds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
                        if ( $rollbacker ) {
                                $fields[] = 'page_latest';
                        }
                }

                // Log entries with DELETED_ACTION must not show up unless the user has
                // the necessary rights.
                if ( !$user->isAllowed( 'deletedhistory' ) ) {
                        $bitmask = LogPage::DELETED_ACTION;
                } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                        $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
                } else {
                        $bitmask = 0;
                }
                if ( $bitmask ) {
                        $conds[] = $dbr->makeList( [
                                'rc_type != ' . RC_LOG,
                                $dbr->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
                        ], LIST_OR );
                }

                ChangeTags::modifyDisplayQuery(
                        $tables,
                        $fields,
                        $conds,
                        $join_conds,
                        $query_options,
                        ''
                );

                $this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts );

                return $dbr->select(
                        $tables,
                        $fields,
                        $conds,
                        __METHOD__,
                        $query_options,
                        $join_conds
                );
        }

        protected function runMainQueryHook( &$tables, &$fields, &$conds, &$query_options,
                &$join_conds, $opts
        ) {
                return parent::runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts )
                        && Hooks::run(
                                'SpecialWatchlistQuery',
                                [ &$conds, &$tables, &$join_conds, &$fields, $opts ],
                                '1.23'
                        );
        }

        /**
         * Return a IDatabase object for reading
         *
         * @return IDatabase
         */
        protected function getDB() {
                return wfGetDB( DB_REPLICA, 'watchlist' );
        }

        /**
         * Output feed links.
         */
        public function outputFeedLinks() {
                $user = $this->getUser();
                $wlToken = $user->getTokenFromOption( 'watchlisttoken' );
                if ( $wlToken ) {
                        $this->addFeedLinks( [
                                'action' => 'feedwatchlist',
                                'allrev' => 1,
                                'wlowner' => $user->getName(),
                                'wltoken' => $wlToken,
                        ] );
                }
        }

        /**
         * Build and output the actual changes list.
         *
         * @param ResultWrapper $rows Database rows
         * @param FormOptions $opts
         */
        public function outputChangesList( $rows, $opts ) {
                $dbr = $this->getDB();
                $user = $this->getUser();
                $output = $this->getOutput();

                # Show a message about replica DB lag, if applicable
                $lag = wfGetLB()->safeGetLag( $dbr );
                if ( $lag > 0 ) {
                        $output->showLagWarning( $lag );
                }

                # If no rows to display, show message before try to render the list
                if ( $rows->numRows() == 0 ) {
                        $output->wrapWikiMsg(
                                "<div class='mw-changeslist-empty'>\n$1\n</div>", 'recentchanges-noresult'
                        );
                        return;
                }

                $dbr->dataSeek( $rows, 0 );

                $list = ChangesList::newFromContext( $this->getContext() );
                $list->setWatchlistDivs();
                $list->initChangesListRows( $rows );
                $dbr->dataSeek( $rows, 0 );

                if ( $this->getConfig()->get( 'RCShowWatchingUsers' )
                        && $user->getOption( 'shownumberswatching' )
                ) {
                        $watchedItemStore = MediaWikiServices::getInstance()->getWatchedItemStore();
                }

                $s = $list->beginRecentChangesList();
                $userShowHiddenCats = $this->getUser()->getBoolOption( 'showhiddencats' );
                $counter = 1;
                foreach ( $rows as $obj ) {
                        # Make RC entry
                        $rc = RecentChange::newFromRow( $obj );

                        # Skip CatWatch entries for hidden cats based on user preference
                        if (
                                $rc->getAttribute( 'rc_type' ) == RC_CATEGORIZE &&
                                !$userShowHiddenCats &&
                                $rc->getParam( 'hidden-cat' )
                        ) {
                                continue;
                        }

                        $rc->counter = $counter++;

                        if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
                                $updated = $obj->wl_notificationtimestamp;
                        } else {
                                $updated = false;
                        }

                        if ( isset( $watchedItemStore ) ) {
                                $rcTitleValue = new TitleValue( (int)$obj->rc_namespace, $obj->rc_title );
                                $rc->numberofWatchingusers = $watchedItemStore->countWatchers( $rcTitleValue );
                        } else {
                                $rc->numberofWatchingusers = 0;
                        }

                        $changeLine = $list->recentChangesLine( $rc, $updated, $counter );
                        if ( $changeLine !== false ) {
                                $s .= $changeLine;
                        }
                }
                $s .= $list->endRecentChangesList();

                $output->addHTML( $s );
        }

        /**
         * Set the text to be displayed above the changes
         *
         * @param FormOptions $opts
         * @param int $numRows Number of rows in the result to show after this header
         */
        public function doHeader( $opts, $numRows ) {
                $user = $this->getUser();
                $out = $this->getOutput();

                $out->addSubtitle(
                        $this->msg( 'watchlistfor2', $user->getName() )
                                ->rawParams( SpecialEditWatchlist::buildTools(
                                        $this->getLanguage(),
                                        $this->getLinkRenderer()
                                ) )
                );

                $this->setTopText( $opts );

                $lang = $this->getLanguage();
                if ( $opts['days'] > 0 ) {
                        $days = $opts['days'];
                } else {
                        $days = $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 );
                }
                $timestamp = wfTimestampNow();
                $wlInfo = $this->msg( 'wlnote' )->numParams( $numRows, round( $days * 24 ) )->params(
                        $lang->userDate( $timestamp, $user ), $lang->userTime( $timestamp, $user )
                )->parse() . "<br />\n";

                $nondefaults = $opts->getChangedValues();
                $cutofflinks = $this->msg( 'wlshowtime' ) . ' ' . $this->cutoffselector( $opts );

                # Spit out some control panel links
                $filters = [
                        'hideminor' => 'wlshowhideminor',
                        'hidebots' => 'wlshowhidebots',
                        'hideanons' => 'wlshowhideanons',
                        'hideliu' => 'wlshowhideliu',
                        'hidemyself' => 'wlshowhidemine',
                        'hidepatrolled' => 'wlshowhidepatr'
                ];

                if ( $this->getConfig()->get( 'RCWatchCategoryMembership' ) ) {
                        $filters['hidecategorization'] = 'wlshowhidecategorization';
                }

                foreach ( $this->getRenderableCustomFilters( $this->getCustomFilters() ) as $key => $params ) {
                        $filters[$key] = $params['msg'];
                }

                // Disable some if needed
                if ( !$user->useRCPatrol() ) {
                        unset( $filters['hidepatrolled'] );
                }

                $links = [];
                foreach ( $filters as $name => $msg ) {
                        $links[] = $this->showHideCheck( $nondefaults, $msg, $name, $opts[$name] );
                }

                $hiddenFields = $nondefaults;
                $hiddenFields['action'] = 'submit';
                unset( $hiddenFields['namespace'] );
                unset( $hiddenFields['invert'] );
                unset( $hiddenFields['associated'] );
                unset( $hiddenFields['days'] );
                foreach ( $filters as $key => $value ) {
                        unset( $hiddenFields[$key] );
                }

                # Create output
                $form = '';

                # Namespace filter and put the whole form together.
                $form .= $wlInfo;
                $form .= $cutofflinks;
                $form .= $this->msg( 'watchlist-hide' ) .
                        $this->msg( 'colon-separator' )->escaped() .
                        implode( ' ', $links );
                $form .= "\n<br />\n";
                $form .= Html::namespaceSelector(
                        [
                                'selected' => $opts['namespace'],
                                'all' => '',
                                'label' => $this->msg( 'namespace' )->text()
                        ], [
                                'name' => 'namespace',
                                'id' => 'namespace',
                                'class' => 'namespaceselector',
                        ]
                ) . "\n";
                $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
                        $this->msg( 'invert' )->text(),
                        'invert',
                        'nsinvert',
                        $opts['invert'],
                        [ 'title' => $this->msg( 'tooltip-invert' )->text() ]
                ) . "</span>\n";
                $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
                        $this->msg( 'namespace_association' )->text(),
                        'associated',
                        'nsassociated',
                        $opts['associated'],
                        [ 'title' => $this->msg( 'tooltip-namespace_association' )->text() ]
                ) . "</span>\n";
                $form .= Xml::submitButton( $this->msg( 'watchlist-submit' )->text() ) . "\n";
                foreach ( $hiddenFields as $key => $value ) {
                        $form .= Html::hidden( $key, $value ) . "\n";
                }
                $form .= Xml::closeElement( 'fieldset' ) . "\n";
                $form .= Xml::closeElement( 'form' ) . "\n";
                $this->getOutput()->addHTML( $form );

                $this->setBottomText( $opts );
        }

        function cutoffselector( $options ) {
                // Cast everything to strings immediately, so that we know all of the values have the same
                // precision, and can be compared with '==='. 2/24 has a few more decimal places than its
                // default string representation, for example, and would confuse comparisons.

                // Misleadingly, the 'days' option supports hours too.
                $days = array_map( 'strval', [ 1/24, 2/24, 6/24, 12/24, 1, 3, 7 ] );

                $userWatchlistOption = (string)$this->getUser()->getOption( 'watchlistdays' );
                // add the user preference, if it isn't available already
                if ( !in_array( $userWatchlistOption, $days ) && $userWatchlistOption !== '0' ) {
                        $days[] = $userWatchlistOption;
                }

                $maxDays = (string)( $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 ) );
                // add the maximum possible value, if it isn't available already
                if ( !in_array( $maxDays, $days ) ) {
                        $days[] = $maxDays;
                }

                $selected = (string)$options['days'];
                if ( $selected <= 0 ) {
                        $selected = $maxDays;
                }

                // add the currently selected value, if it isn't available already
                if ( !in_array( $selected, $days ) ) {
                        $days[] = $selected;
                }

                $select = new XmlSelect( 'days', 'days', $selected );

                asort( $days );
                foreach ( $days as $value ) {
                        if ( $value < 1 ) {
                                $name = $this->msg( 'hours' )->numParams( $value * 24 )->text();
                        } else {
                                $name = $this->msg( 'days' )->numParams( $value )->text();
                        }
                        $select->addOption( $name, $value );
                }

                return $select->getHTML() . "\n<br />\n";
        }

        function setTopText( FormOptions $opts ) {
                $nondefaults = $opts->getChangedValues();
                $form = "";
                $user = $this->getUser();

                $numItems = $this->countItems();
                $showUpdatedMarker = $this->getConfig()->get( 'ShowUpdatedMarker' );

                // Show watchlist header
                $form .= "<p>";
                if ( $numItems == 0 ) {
                        $form .= $this->msg( 'nowatchlist' )->parse() . "\n";
                } else {
                        $form .= $this->msg( 'watchlist-details' )->numParams( $numItems )->parse() . "\n";
                        if ( $this->getConfig()->get( 'EnotifWatchlist' )
                                && $user->getOption( 'enotifwatchlistpages' )
                        ) {
                                $form .= $this->msg( 'wlheader-enotif' )->parse() . "\n";
                        }
                        if ( $showUpdatedMarker ) {
                                $form .= $this->msg( 'wlheader-showupdated' )->parse() . "\n";
                        }
                }
                $form .= "</p>";

                if ( $numItems > 0 && $showUpdatedMarker ) {
                        $form .= Xml::openElement( 'form', [ 'method' => 'post',
                                'action' => $this->getPageTitle()->getLocalURL(),
                                'id' => 'mw-watchlist-resetbutton' ] ) . "\n" .
                        Xml::submitButton( $this->msg( 'enotif_reset' )->text(),
                                [ 'name' => 'mw-watchlist-reset-submit' ] ) . "\n" .
                        Html::hidden( 'reset', 'all' ) . "\n";
                        foreach ( $nondefaults as $key => $value ) {
                                $form .= Html::hidden( $key, $value ) . "\n";
                        }
                        $form .= Xml::closeElement( 'form' ) . "\n";
                }

                $form .= Xml::openElement( 'form', [
                        'method' => 'get',
                        'action' => wfScript(),
                        'id' => 'mw-watchlist-form'
                ] );
                $form .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
                $form .= Xml::fieldset(
                        $this->msg( 'watchlist-options' )->text(),
                        false,
                        [ 'id' => 'mw-watchlist-options' ]
                );

                $form .= $this->makeLegend();

                $this->getOutput()->addHTML( $form );
        }

        protected function showHideCheck( $options, $message, $name, $value ) {
                $options[$name] = 1 - (int)$value;

                return '<span class="mw-input-with-label">' . Xml::checkLabel(
                        $this->msg( $message, '' )->text(),
                        $name,
                        $name,
                        (int)$value
                ) . '</span>';
        }

        /**
         * Count the number of paired items on a user's watchlist.
         * The assumption made here is that when a subject page is watched a talk page is also watched.
         * Hence the number of individual items is halved.
         *
         * @return int
         */
        protected function countItems() {
                $store = MediaWikiServices::getInstance()->getWatchedItemStore();
                $count = $store->countWatchedItems( $this->getUser() );
                return floor( $count / 2 );
        }
}