Special:Upload should not crash on failing previews

[mediawiki.git] / includes / specials / pagers / ContribsPager.php

<?php
/**
 * 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 Pager
 */

/**
 * Pager for Special:Contributions
 * @ingroup Pager
 */
use MediaWiki\MediaWikiServices;

class ContribsPager extends ReverseChronologicalPager {

        public $mDefaultDirection = IndexPager::DIR_DESCENDING;
        public $messages;
        public $target;
        public $namespace = '';
        public $mDb;
        public $preventClickjacking = false;

        /** @var IDatabase */
        public $mDbSecondary;

        /**
         * @var array
         */
        protected $mParentLens;

        function __construct( IContextSource $context, array $options ) {
                parent::__construct( $context );

                $msgs = [
                        'diff',
                        'hist',
                        'pipe-separator',
                        'uctop'
                ];

                foreach ( $msgs as $msg ) {
                        $this->messages[$msg] = $this->msg( $msg )->escaped();
                }

                $this->target = isset( $options['target'] ) ? $options['target'] : '';
                $this->contribs = isset( $options['contribs'] ) ? $options['contribs'] : 'users';
                $this->namespace = isset( $options['namespace'] ) ? $options['namespace'] : '';
                $this->tagFilter = isset( $options['tagfilter'] ) ? $options['tagfilter'] : false;
                $this->nsInvert = isset( $options['nsInvert'] ) ? $options['nsInvert'] : false;
                $this->associated = isset( $options['associated'] ) ? $options['associated'] : false;

                $this->deletedOnly = !empty( $options['deletedOnly'] );
                $this->topOnly = !empty( $options['topOnly'] );
                $this->newOnly = !empty( $options['newOnly'] );
                $this->hideMinor = !empty( $options['hideMinor'] );

                $year = isset( $options['year'] ) ? $options['year'] : false;
                $month = isset( $options['month'] ) ? $options['month'] : false;
                $this->getDateCond( $year, $month );

                // Most of this code will use the 'contributions' group DB, which can map to replica DBs
                // with extra user based indexes or partioning by user. The additional metadata
                // queries should use a regular replica DB since the lookup pattern is not all by user.
                $this->mDbSecondary = wfGetDB( DB_REPLICA ); // any random replica DB
                $this->mDb = wfGetDB( DB_REPLICA, 'contributions' );
        }

        function getDefaultQuery() {
                $query = parent::getDefaultQuery();
                $query['target'] = $this->target;

                return $query;
        }

        /**
         * This method basically executes the exact same code as the parent class, though with
         * a hook added, to allow extensions to add additional queries.
         *
         * @param string $offset Index offset, inclusive
         * @param int $limit Exact query limit
         * @param bool $descending Query direction, false for ascending, true for descending
         * @return ResultWrapper
         */
        function reallyDoQuery( $offset, $limit, $descending ) {
                list( $tables, $fields, $conds, $fname, $options, $join_conds ) = $this->buildQueryInfo(
                        $offset,
                        $limit,
                        $descending
                );

                /*
                 * This hook will allow extensions to add in additional queries, so they can get their data
                 * in My Contributions as well. Extensions should append their results to the $data array.
                 *
                 * Extension queries have to implement the navbar requirement as well. They should
                 * - have a column aliased as $pager->getIndexField()
                 * - have LIMIT set
                 * - have a WHERE-clause that compares the $pager->getIndexField()-equivalent column to the offset
                 * - have the ORDER BY specified based upon the details provided by the navbar
                 *
                 * See includes/Pager.php buildQueryInfo() method on how to build LIMIT, WHERE & ORDER BY
                 *
                 * &$data: an array of results of all contribs queries
                 * $pager: the ContribsPager object hooked into
                 * $offset: see phpdoc above
                 * $limit: see phpdoc above
                 * $descending: see phpdoc above
                 */
                $data = [ $this->mDb->select(
                        $tables, $fields, $conds, $fname, $options, $join_conds
                ) ];
                Hooks::run(
                        'ContribsPager::reallyDoQuery',
                        [ &$data, $this, $offset, $limit, $descending ]
                );

                $result = [];

                // loop all results and collect them in an array
                foreach ( $data as $query ) {
                        foreach ( $query as $i => $row ) {
                                // use index column as key, allowing us to easily sort in PHP
                                $result[$row->{$this->getIndexField()} . "-$i"] = $row;
                        }
                }

                // sort results
                if ( $descending ) {
                        ksort( $result );
                } else {
                        krsort( $result );
                }

                // enforce limit
                $result = array_slice( $result, 0, $limit );

                // get rid of array keys
                $result = array_values( $result );

                return new FakeResultWrapper( $result );
        }

        function getQueryInfo() {
                list( $tables, $index, $userCond, $join_cond ) = $this->getUserCond();

                $user = $this->getUser();
                $conds = array_merge( $userCond, $this->getNamespaceCond() );

                // Paranoia: avoid brute force searches (bug 17342)
                if ( !$user->isAllowed( 'deletedhistory' ) ) {
                        $conds[] = $this->mDb->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0';
                } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                        $conds[] = $this->mDb->bitAnd( 'rev_deleted', Revision::SUPPRESSED_USER ) .
                                ' != ' . Revision::SUPPRESSED_USER;
                }

                # Don't include orphaned revisions
                $join_cond['page'] = Revision::pageJoinCond();
                # Get the current user name for accounts
                $join_cond['user'] = Revision::userJoinCond();

                $options = [];
                if ( $index ) {
                        $options['USE INDEX'] = [ 'revision' => $index ];
                }

                $queryInfo = [
                        'tables' => $tables,
                        'fields' => array_merge(
                                Revision::selectFields(),
                                Revision::selectUserFields(),
                                [ 'page_namespace', 'page_title', 'page_is_new',
                                        'page_latest', 'page_is_redirect', 'page_len' ]
                        ),
                        'conds' => $conds,
                        'options' => $options,
                        'join_conds' => $join_cond
                ];

                ChangeTags::modifyDisplayQuery(
                        $queryInfo['tables'],
                        $queryInfo['fields'],
                        $queryInfo['conds'],
                        $queryInfo['join_conds'],
                        $queryInfo['options'],
                        $this->tagFilter
                );

                Hooks::run( 'ContribsPager::getQueryInfo', [ &$this, &$queryInfo ] );

                return $queryInfo;
        }

        function getUserCond() {
                $condition = [];
                $join_conds = [];
                $tables = [ 'revision', 'page', 'user' ];
                $index = false;
                if ( $this->contribs == 'newbie' ) {
                        $max = $this->mDb->selectField( 'user', 'max(user_id)', false, __METHOD__ );
                        $condition[] = 'rev_user >' . (int)( $max - $max / 100 );
                        # ignore local groups with the bot right
                        # @todo FIXME: Global groups may have 'bot' rights
                        $groupsWithBotPermission = User::getGroupsWithPermission( 'bot' );
                        if ( count( $groupsWithBotPermission ) ) {
                                $tables[] = 'user_groups';
                                $condition[] = 'ug_group IS NULL';
                                $join_conds['user_groups'] = [
                                        'LEFT JOIN', [
                                                'ug_user = rev_user',
                                                'ug_group' => $groupsWithBotPermission
                                        ]
                                ];
                        }
                        // (T140537) Disallow looking too far in the past for 'newbies' queries. If the user requested
                        // a timestamp offset far in the past such that there are no edits by users with user_ids in
                        // the range, we would end up scanning all revisions from that offset until start of time.
                        $condition[] = 'rev_timestamp > ' .
                                $this->mDb->addQuotes( $this->mDb->timestamp( wfTimestamp() - 30 * 24 * 60 * 60 ) );
                } else {
                        $uid = User::idFromName( $this->target );
                        if ( $uid ) {
                                $condition['rev_user'] = $uid;
                                $index = 'user_timestamp';
                        } else {
                                $condition['rev_user_text'] = $this->target;
                                $index = 'usertext_timestamp';
                        }
                }

                if ( $this->deletedOnly ) {
                        $condition[] = 'rev_deleted != 0';
                }

                if ( $this->topOnly ) {
                        $condition[] = 'rev_id = page_latest';
                }

                if ( $this->newOnly ) {
                        $condition[] = 'rev_parent_id = 0';
                }

                if ( $this->hideMinor ) {
                        $condition[] = 'rev_minor_edit = 0';
                }

                return [ $tables, $index, $condition, $join_conds ];
        }

        function getNamespaceCond() {
                if ( $this->namespace !== '' ) {
                        $selectedNS = $this->mDb->addQuotes( $this->namespace );
                        $eq_op = $this->nsInvert ? '!=' : '=';
                        $bool_op = $this->nsInvert ? 'AND' : 'OR';

                        if ( !$this->associated ) {
                                return [ "page_namespace $eq_op $selectedNS" ];
                        }

                        $associatedNS = $this->mDb->addQuotes(
                                MWNamespace::getAssociated( $this->namespace )
                        );

                        return [
                                "page_namespace $eq_op $selectedNS " .
                                $bool_op .
                                " page_namespace $eq_op $associatedNS"
                        ];
                }

                return [];
        }

        function getIndexField() {
                return 'rev_timestamp';
        }

        function doBatchLookups() {
                # Do a link batch query
                $this->mResult->seek( 0 );
                $parentRevIds = [];
                $this->mParentLens = [];
                $batch = new LinkBatch();
                # Give some pointers to make (last) links
                foreach ( $this->mResult as $row ) {
                        if ( isset( $row->rev_parent_id ) && $row->rev_parent_id ) {
                                $parentRevIds[] = $row->rev_parent_id;
                        }
                        if ( isset( $row->rev_id ) ) {
                                $this->mParentLens[$row->rev_id] = $row->rev_len;
                                if ( $this->contribs === 'newbie' ) { // multiple users
                                        $batch->add( NS_USER, $row->user_name );
                                        $batch->add( NS_USER_TALK, $row->user_name );
                                }
                                $batch->add( $row->page_namespace, $row->page_title );
                        }
                }
                # Fetch rev_len for revisions not already scanned above
                $this->mParentLens += Revision::getParentLengths(
                        $this->mDbSecondary,
                        array_diff( $parentRevIds, array_keys( $this->mParentLens ) )
                );
                $batch->execute();
                $this->mResult->seek( 0 );
        }

        /**
         * @return string
         */
        function getStartBody() {
                return "<ul class=\"mw-contributions-list\">\n";
        }

        /**
         * @return string
         */
        function getEndBody() {
                return "</ul>\n";
        }

        /**
         * Generates each row in the contributions list.
         *
         * Contributions which are marked "top" are currently on top of the history.
         * For these contributions, a [rollback] link is shown for users with roll-
         * back privileges. The rollback link restores the most recent version that
         * was not written by the target user.
         *
         * @todo This would probably look a lot nicer in a table.
         * @param object $row
         * @return string
         */
        function formatRow( $row ) {

                $ret = '';
                $classes = [];

                $linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();

                /*
                 * There may be more than just revision rows. To make sure that we'll only be processing
                 * revisions here, let's _try_ to build a revision out of our row (without displaying
                 * notices though) and then trying to grab data from the built object. If we succeed,
                 * we're definitely dealing with revision data and we may proceed, if not, we'll leave it
                 * to extensions to subscribe to the hook to parse the row.
                 */
                MediaWiki\suppressWarnings();
                try {
                        $rev = new Revision( $row );
                        $validRevision = (bool)$rev->getId();
                } catch ( Exception $e ) {
                        $validRevision = false;
                }
                MediaWiki\restoreWarnings();

                if ( $validRevision ) {
                        $classes = [];

                        $page = Title::newFromRow( $row );
                        $link = $linkRenderer->makeLink(
                                $page,
                                $page->getPrefixedText(),
                                [ 'class' => 'mw-contributions-title' ],
                                $page->isRedirect() ? [ 'redirect' => 'no' ] : []
                        );
                        # Mark current revisions
                        $topmarktext = '';
                        $user = $this->getUser();
                        if ( $row->rev_id === $row->page_latest ) {
                                $topmarktext .= '<span class="mw-uctop">' . $this->messages['uctop'] . '</span>';
                                $classes[] = 'mw-contributions-current';
                                # Add rollback link
                                if ( !$row->page_is_new && $page->quickUserCan( 'rollback', $user )
                                        && $page->quickUserCan( 'edit', $user )
                                ) {
                                        $this->preventClickjacking();
                                        $topmarktext .= ' ' . Linker::generateRollback( $rev, $this->getContext() );
                                }
                        }
                        # Is there a visible previous revision?
                        if ( $rev->userCan( Revision::DELETED_TEXT, $user ) && $rev->getParentId() !== 0 ) {
                                $difftext = $linkRenderer->makeKnownLink(
                                        $page,
                                        new HtmlArmor( $this->messages['diff'] ),
                                        [],
                                        [
                                                'diff' => 'prev',
                                                'oldid' => $row->rev_id
                                        ]
                                );
                        } else {
                                $difftext = $this->messages['diff'];
                        }
                        $histlink = $linkRenderer->makeKnownLink(
                                $page,
                                new HtmlArmor( $this->messages['hist'] ),
                                [],
                                [ 'action' => 'history' ]
                        );

                        if ( $row->rev_parent_id === null ) {
                                // For some reason rev_parent_id isn't populated for this row.
                                // Its rumoured this is true on wikipedia for some revisions (bug 34922).
                                // Next best thing is to have the total number of bytes.
                                $chardiff = ' <span class="mw-changeslist-separator">. .</span> ';
                                $chardiff .= Linker::formatRevisionSize( $row->rev_len );
                                $chardiff .= ' <span class="mw-changeslist-separator">. .</span> ';
                        } else {
                                $parentLen = 0;
                                if ( isset( $this->mParentLens[$row->rev_parent_id] ) ) {
                                        $parentLen = $this->mParentLens[$row->rev_parent_id];
                                }

                                $chardiff = ' <span class="mw-changeslist-separator">. .</span> ';
                                $chardiff .= ChangesList::showCharacterDifference(
                                        $parentLen,
                                        $row->rev_len,
                                        $this->getContext()
                                );
                                $chardiff .= ' <span class="mw-changeslist-separator">. .</span> ';
                        }

                        $lang = $this->getLanguage();
                        $comment = $lang->getDirMark() . Linker::revComment( $rev, false, true );
                        $date = $lang->userTimeAndDate( $row->rev_timestamp, $user );
                        if ( $rev->userCan( Revision::DELETED_TEXT, $user ) ) {
                                $d = $linkRenderer->makeKnownLink(
                                        $page,
                                        $date,
                                        [ 'class' => 'mw-changeslist-date' ],
                                        [ 'oldid' => intval( $row->rev_id ) ]
                                );
                        } else {
                                $d = htmlspecialchars( $date );
                        }
                        if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
                                $d = '<span class="history-deleted">' . $d . '</span>';
                        }

                        # Show user names for /newbies as there may be different users.
                        # Note that we already excluded rows with hidden user names.
                        if ( $this->contribs == 'newbie' ) {
                                $userlink = ' . . ' . $lang->getDirMark()
                                        . Linker::userLink( $rev->getUser(), $rev->getUserText() );
                                $userlink .= ' ' . $this->msg( 'parentheses' )->rawParams(
                                                Linker::userTalkLink( $rev->getUser(), $rev->getUserText() ) )->escaped() . ' ';
                        } else {
                                $userlink = '';
                        }

                        $flags = [];
                        if ( $rev->getParentId() === 0 ) {
                                $flags[] = ChangesList::flag( 'newpage' );
                        }

                        if ( $rev->isMinor() ) {
                                $flags[] = ChangesList::flag( 'minor' );
                        }

                        $del = Linker::getRevDeleteLink( $user, $rev, $page );
                        if ( $del !== '' ) {
                                $del .= ' ';
                        }

                        $diffHistLinks = $this->msg( 'parentheses' )
                                ->rawParams( $difftext . $this->messages['pipe-separator'] . $histlink )
                                ->escaped();

                        # Tags, if any.
                        list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
                                $row->ts_tags,
                                'contributions',
                                $this->getContext()
                        );
                        $classes = array_merge( $classes, $newClasses );

                        Hooks::run( 'SpecialContributions::formatRow::flags', [ $this->getContext(), $row, &$flags ] );

                        $templateParams = [
                                'del' => $del,
                                'timestamp' => $d,
                                'diffHistLinks' => $diffHistLinks,
                                'charDifference' => $chardiff,
                                'flags' => $flags,
                                'articleLink' => $link,
                                'userlink' => $userlink,
                                'logText' => $comment,
                                'topmarktext' => $topmarktext,
                                'tagSummary' => $tagSummary,
                        ];

                        # Denote if username is redacted for this edit
                        if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
                                $templateParams['rev-deleted-user-contribs'] =
                                        $this->msg( 'rev-deleted-user-contribs' )->escaped();
                        }

                        $templateParser = new TemplateParser();
                        $ret = $templateParser->processTemplate(
                                'SpecialContributionsLine',
                                $templateParams
                        );
                }

                // Let extensions add data
                Hooks::run( 'ContributionsLineEnding', [ $this, &$ret, $row, &$classes ] );

                // TODO: Handle exceptions in the catch block above.  Do any extensions rely on
                // receiving empty rows?

                if ( $classes === [] && $ret === '' ) {
                        wfDebug( "Dropping Special:Contribution row that could not be formatted\n" );
                        return "<!-- Could not format Special:Contribution row. -->\n";
                }

                // FIXME: The signature of the ContributionsLineEnding hook makes it
                // very awkward to move this LI wrapper into the template.
                return Html::rawElement( 'li', [ 'class' => $classes ], $ret ) . "\n";
        }

        /**
         * Overwrite Pager function and return a helpful comment
         * @return string
         */
        function getSqlComment() {
                if ( $this->namespace || $this->deletedOnly ) {
                        // potentially slow, see CR r58153
                        return 'contributions page filtered for namespace or RevisionDeleted edits';
                } else {
                        return 'contributions page unfiltered';
                }
        }

        protected function preventClickjacking() {
                $this->preventClickjacking = true;
        }

        /**
         * @return bool
         */
        public function getPreventClickjacking() {
                return $this->preventClickjacking;
        }
}