]> scripts.mit.edu Git - autoinstallsdev/mediawiki.git/blobdiff - includes/specials/pagers/ContribsPager.php
MediaWiki 1.30.2
[autoinstallsdev/mediawiki.git] / includes / specials / pagers / ContribsPager.php
diff --git a/includes/specials/pagers/ContribsPager.php b/includes/specials/pagers/ContribsPager.php
new file mode 100644 (file)
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@@ -0,0 +1,693 @@
+<?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;
+use Wikimedia\Rdbms\ResultWrapper;
+use Wikimedia\Rdbms\FakeResultWrapper;
+use Wikimedia\Rdbms\IDatabase;
+
+class ContribsPager extends RangeChronologicalPager {
+
+       public $mDefaultDirection = IndexPager::DIR_DESCENDING;
+       public $messages;
+       public $target;
+       public $namespace = '';
+       public $mDb;
+       public $preventClickjacking = false;
+
+       /** @var IDatabase */
+       public $mDbSecondary;
+
+       /**
+        * @var array
+        */
+       protected $mParentLens;
+
+       /**
+        * @var TemplateParser
+        */
+       protected $templateParser;
+
+       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'] );
+
+               // Date filtering: use timestamp if available
+               $startTimestamp = '';
+               $endTimestamp = '';
+               if ( $options['start'] ) {
+                       $startTimestamp = $options['start'] . ' 00:00:00';
+               }
+               if ( $options['end'] ) {
+                       $endTimestamp = $options['end'] . ' 23:59:59';
+               }
+               $this->getDateRangeCond( $startTimestamp, $endTimestamp );
+
+               // This property on IndexPager is set by $this->getIndexField() in parent::__construct().
+               // We need to reassign it here so that it is used when the actual query is ran.
+               $this->mIndexField = $this->getIndexField();
+
+               // 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' );
+               $this->templateParser = new TemplateParser();
+       }
+
+       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, $this->getNamespaceCond() );
+
+               // Paranoia: avoid brute force searches (T19342)
+               if ( !$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
+               ];
+
+               // For IPv6, we use ipc_rev_timestamp on ip_changes as the index field,
+               // which will be referenced when parsing the results of a query.
+               if ( self::isQueryableRange( $this->target ) ) {
+                       $queryInfo['fields'][] = 'ipc_rev_timestamp';
+               }
+
+               ChangeTags::modifyDisplayQuery(
+                       $queryInfo['tables'],
+                       $queryInfo['fields'],
+                       $queryInfo['conds'],
+                       $queryInfo['join_conds'],
+                       $queryInfo['options'],
+                       $this->tagFilter
+               );
+
+               // Avoid PHP 7.1 warning from passing $this by reference
+               $pager = $this;
+               Hooks::run( 'ContribsPager::getQueryInfo', [ &$pager, &$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,
+                                               'ug_expiry IS NULL OR ug_expiry >= ' .
+                                                       $this->mDb->addQuotes( $this->mDb->timestamp() )
+                                       ]
+                               ];
+                       }
+                       // (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 {
+                               $ipRangeConds = $this->getIpRangeConds( $this->mDb, $this->target );
+
+                               if ( $ipRangeConds ) {
+                                       $tables[] = 'ip_changes';
+                                       $join_conds['ip_changes'] = [
+                                               'LEFT JOIN', [ 'ipc_rev_id = rev_id' ]
+                                       ];
+                                       $condition[] = $ipRangeConds;
+                               } 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 [];
+       }
+
+       /**
+        * Get SQL conditions for an IP range, if applicable
+        * @param IDatabase      $db
+        * @param string         $ip The IP address or CIDR
+        * @return string|false  SQL for valid IP ranges, false if invalid
+        */
+       private function getIpRangeConds( $db, $ip ) {
+               // First make sure it is a valid range and they are not outside the CIDR limit
+               if ( !$this->isQueryableRange( $ip ) ) {
+                       return false;
+               }
+
+               list( $start, $end ) = IP::parseRange( $ip );
+
+               return 'ipc_hex BETWEEN ' . $db->addQuotes( $start ) . ' AND ' . $db->addQuotes( $end );
+       }
+
+       /**
+        * Is the given IP a range and within the CIDR limit?
+        *
+        * @param string $ipRange
+        * @return bool True if it is valid
+        * @since 1.30
+        */
+       public function isQueryableRange( $ipRange ) {
+               $limits = $this->getConfig()->get( 'RangeContributionsCIDRLimit' );
+
+               $bits = IP::parseCIDR( $ipRange )[1];
+               if (
+                       ( $bits === false ) ||
+                       ( IP::isIPv4( $ipRange ) && $bits < $limits['IPv4'] ) ||
+                       ( IP::isIPv6( $ipRange ) && $bits < $limits['IPv6'] )
+               ) {
+                       return false;
+               }
+
+               return true;
+       }
+
+       /**
+        * Override of getIndexField() in IndexPager.
+        * For IP ranges, it's faster to use the replicated ipc_rev_timestamp
+        * on the `ip_changes` table than the rev_timestamp on the `revision` table.
+        * @return string Name of field
+        */
+       public function getIndexField() {
+               if ( $this->isQueryableRange( $this->target ) ) {
+                       return 'ipc_rev_timestamp';
+               } else {
+                       return 'rev_timestamp';
+               }
+       }
+
+       function doBatchLookups() {
+               # Do a link batch query
+               $this->mResult->seek( 0 );
+               $parentRevIds = [];
+               $this->mParentLens = [];
+               $batch = new LinkBatch();
+               $isIpRange = $this->isQueryableRange( $this->target );
+               # 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 );
+                               } elseif ( $isIpRange ) {
+                                       // If this is an IP range, batch the IP's talk page
+                                       $batch->add( NS_USER_TALK, $row->rev_user_text );
+                               }
+                               $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 = [];
+               $attribs = [];
+
+               $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 ) {
+                       $attribs['data-mw-revid'] = $rev->getId();
+
+                       $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'] ),
+                                       [ 'class' => 'mw-changeslist-diff' ],
+                                       [
+                                               'diff' => 'prev',
+                                               'oldid' => $row->rev_id
+                                       ]
+                               );
+                       } else {
+                               $difftext = $this->messages['diff'];
+                       }
+                       $histlink = $linkRenderer->makeKnownLink(
+                               $page,
+                               new HtmlArmor( $this->messages['hist'] ),
+                               [ 'class' => 'mw-changeslist-history' ],
+                               [ '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 (T36922).
+                               // 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 only unprivileged users have rows with hidden user names excluded.
+                       # When querying for an IP range, we want to always show user and user talk links.
+                       $userlink = '';
+                       if ( ( $this->contribs == 'newbie' && !$rev->isDeleted( Revision::DELETED_USER ) )
+                               || $this->isQueryableRange( $this->target ) ) {
+                               $userlink = ' . . ' . $lang->getDirMark()
+                                       . Linker::userLink( $rev->getUser(), $rev->getUserText() );
+                               $userlink .= ' ' . $this->msg( 'parentheses' )->rawParams(
+                                       Linker::userTalkLink( $rev->getUser(), $rev->getUserText() ) )->escaped() . ' ';
+                       }
+
+                       $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();
+                       }
+
+                       $ret = $this->templateParser->processTemplate(
+                               'SpecialContributionsLine',
+                               $templateParams
+                       );
+               }
+
+               // Let extensions add data
+               Hooks::run( 'ContributionsLineEnding', [ $this, &$ret, $row, &$classes, &$attribs ] );
+               $attribs = wfArrayFilterByKey( $attribs, [ Sanitizer::class, 'isReservedDataAttribute' ] );
+
+               // TODO: Handle exceptions in the catch block above.  Do any extensions rely on
+               // receiving empty rows?
+
+               if ( $classes === [] && $attribs === [] && $ret === '' ) {
+                       wfDebug( "Dropping Special:Contribution row that could not be formatted\n" );
+                       return "<!-- Could not format Special:Contribution row. -->\n";
+               }
+               $attribs['class'] = $classes;
+
+               // FIXME: The signature of the ContributionsLineEnding hook makes it
+               // very awkward to move this LI wrapper into the template.
+               return Html::rawElement( 'li', $attribs, $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;
+       }
+
+       /**
+        * Set up date filter options, given request data.
+        *
+        * @param array $opts Options array
+        * @return array Options array with processed start and end date filter options
+        */
+       public static function processDateFilter( $opts ) {
+               $start = isset( $opts['start'] ) ? $opts['start'] : '';
+               $end = isset( $opts['end'] ) ? $opts['end'] : '';
+               $year = isset( $opts['year'] ) ? $opts['year'] : '';
+               $month = isset( $opts['month'] ) ? $opts['month'] : '';
+
+               if ( $start !== '' && $end !== '' && $start > $end ) {
+                       $temp = $start;
+                       $start = $end;
+                       $end = $temp;
+               }
+
+               // If year/month legacy filtering options are set, convert them to display the new stamp
+               if ( $year !== '' || $month !== '' ) {
+                       // Reuse getDateCond logic, but subtract a day because
+                       // the endpoints of our date range appear inclusive
+                       // but the internal end offsets are always exclusive
+                       $legacyTimestamp = ReverseChronologicalPager::getOffsetDate( $year, $month );
+                       $legacyDateTime = new DateTime( $legacyTimestamp->getTimestamp( TS_ISO_8601 ) );
+                       $legacyDateTime = $legacyDateTime->modify( '-1 day' );
+
+                       // Clear the new timestamp range options if used and
+                       // replace with the converted legacy timestamp
+                       $start = '';
+                       $end = $legacyDateTime->format( 'Y-m-d' );
+               }
+
+               $opts['start'] = $start;
+               $opts['end'] = $end;
+
+               return $opts;
+       }
+}