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<?php
/**
* Page history
*
* Split off from Article.php and Skin.php, 2003-12-22
* @file
*/
/**
* This class handles printing the history page for an article. In order to
* be efficient, it uses timestamps rather than offsets for paging, to avoid
* costly LIMIT,offset queries.
*
* Construct it by passing in an Article, and call $h->history() to print the
* history.
*
*/
class PageHistory {
const DIR_PREV = 0;
const DIR_NEXT = 1;
var $mArticle, $mTitle, $mSkin;
var $lastdate;
var $linesonpage;
var $mLatestId = null;
/**
* Construct a new PageHistory.
*
* @param Article $article
* @returns nothing
*/
function __construct( $article ) {
global $wgUser;
$this->mArticle =& $article;
$this->mTitle =& $article->mTitle;
$this->mSkin = $wgUser->getSkin();
$this->preCacheMessages();
}
function getArticle() {
return $this->mArticle;
}
function getTitle() {
return $this->mTitle;
}
/**
* As we use the same small set of messages in various methods and that
* they are called often, we call them once and save them in $this->message
*/
function preCacheMessages() {
// Precache various messages
if( !isset( $this->message ) ) {
foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
$this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
}
}
}
/**
* Print the history page for an article.
*
* @returns nothing
*/
function history() {
global $wgOut, $wgRequest, $wgTitle, $wgScript;
/*
* Allow client caching.
*/
if( $wgOut->checkLastModified( $this->mArticle->getTouched() ) )
return; // Client cache fresh and headers sent, nothing more to do.
wfProfileIn( __METHOD__ );
/*
* Setup page variables.
*/
$wgOut->setPageTitle( wfMsg( 'history-title', $this->mTitle->getPrefixedText() ) );
$wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
$wgOut->setArticleFlag( false );
$wgOut->setArticleRelated( true );
$wgOut->setRobotPolicy( 'noindex,nofollow' );
$wgOut->setSyndicated( true );
$wgOut->setFeedAppendQuery( 'action=history' );
$wgOut->addScriptFile( 'history.js' );
$logPage = SpecialPage::getTitleFor( 'Log' );
$logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ),
'page=' . $this->mTitle->getPrefixedUrl() );
$wgOut->setSubtitle( $logLink );
$feedType = $wgRequest->getVal( 'feed' );
if( $feedType ) {
wfProfileOut( __METHOD__ );
return $this->feed( $feedType );
}
/*
* Fail if article doesn't exist.
*/
if( !$this->mTitle->exists() ) {
$wgOut->addWikiMsg( 'nohistory' );
wfProfileOut( __METHOD__ );
return;
}
/**
* Add date selector to quickly get to a certain time
*/
$year = $wgRequest->getInt( 'year' );
$month = $wgRequest->getInt( 'month' );
$action = htmlspecialchars( $wgScript );
$wgOut->addHTML(
"<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
Xml::fieldset( wfMsg( 'history-fieldset-title' ), false, array( 'id' => 'mw-history-search' ) ) .
Xml::hidden( 'title', $this->mTitle->getPrefixedDBKey() ) . "\n" .
Xml::hidden( 'action', 'history' ) . "\n" .
$this->getDateMenu( $year, $month ) . ' ' .
Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
'</fieldset></form>'
);
wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
/**
* Do the list
*/
$pager = new PageHistoryPager( $this, $year, $month );
$this->linesonpage = $pager->getNumRows();
$wgOut->addHTML(
$pager->getNavigationBar() .
$this->beginHistoryList() .
$pager->getBody() .
$this->endHistoryList() .
$pager->getNavigationBar()
);
wfProfileOut( __METHOD__ );
}
/**
* @return string Formatted HTML
* @param int $year
* @param int $month
*/
private function getDateMenu( $year, $month ) {
# Offset overrides year/month selection
if( $month && $month !== -1 ) {
$encMonth = intval( $month );
} else {
$encMonth = '';
}
if( $year ) {
$encYear = intval( $year );
} else if( $encMonth ) {
$thisMonth = intval( gmdate( 'n' ) );
$thisYear = intval( gmdate( 'Y' ) );
if( intval($encMonth) > $thisMonth ) {
$thisYear--;
}
$encYear = $thisYear;
} else {
$encYear = '';
}
return Xml::label( wfMsg( 'year' ), 'year' ) . ' '.
Xml::input( 'year', 4, $encYear, array('id' => 'year', 'maxlength' => 4) ) .
' '.
Xml::label( wfMsg( 'month' ), 'month' ) . ' '.
Xml::monthSelector( $encMonth, -1 );
}
/**
* Creates begin of history list with a submit button
*
* @return string HTML output
*/
function beginHistoryList() {
global $wgTitle, $wgScript, $wgEnableHtmlDiff;
$this->lastdate = '';
$s = wfMsgExt( 'histlegend', array( 'parse') );
$s .= Xml::openElement( 'form', array( 'action' => $wgScript, 'id' => 'mw-history-compare' ) );
$s .= Xml::hidden( 'title', $wgTitle->getPrefixedDbKey() );
if( $wgEnableHtmlDiff ) {
$s .= $this->submitButton( wfMsg( 'visualcomparison'),
array(
'name' => 'htmldiff',
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
$s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
array(
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
} else {
$s .= $this->submitButton( wfMsg( 'compareselectedversions'),
array(
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
}
$s .= '<ul id="pagehistory">' . "\n";
return $s;
}
/**
* Creates end of history list with a submit button
*
* @return string HTML output
*/
function endHistoryList() {
global $wgEnableHtmlDiff;
$s = '</ul>';
if( $wgEnableHtmlDiff ) {
$s .= $this->submitButton( wfMsg( 'visualcomparison'),
array(
'name' => 'htmldiff',
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
$s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
array(
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
} else {
$s .= $this->submitButton( wfMsg( 'compareselectedversions'),
array(
'class' => 'historysubmit',
'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
'title' => wfMsg( 'tooltip-compareselectedversions' ),
)
);
}
$s .= '</form>';
return $s;
}
/**
* Creates a submit button
*
* @param array $attributes attributes
* @return string HTML output for the submit button
*/
function submitButton($message, $attributes = array() ) {
# Disable submit button if history has 1 revision only
if( $this->linesonpage > 1 ) {
return Xml::submitButton( $message , $attributes );
} else {
return '';
}
}
/**
* Returns a row from the history printout.
*
* @todo document some more, and maybe clean up the code (some params redundant?)
*
* @param Row $row The database row corresponding to the previous line.
* @param mixed $next The database row corresponding to the next line.
* @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
* @param $notificationtimestamp
* @param bool $latest Whether this row corresponds to the page's latest revision.
* @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
* @return string HTML output for the row
*/
function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
global $wgUser, $wgLang;
$rev = new Revision( $row );
$rev->setTitle( $this->mTitle );
$curlink = $this->curLink( $rev, $latest );
$lastlink = $this->lastLink( $rev, $next, $counter );
$arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
$link = $this->revLink( $rev );
$s = "($curlink) ($lastlink) $arbitrary";
if( $wgUser->isAllowed( 'deleterevision' ) ) {
$revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
if( $firstInList ) {
// We don't currently handle well changing the top revision's settings
$del = $this->message['rev-delundel'];
} else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
// If revision was hidden from sysops
$del = $this->message['rev-delundel'];
} else {
$del = $this->mSkin->makeKnownLinkObj( $revdel,
$this->message['rev-delundel'],
'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
'&oldid=' . urlencode( $rev->getId() ) );
// Bolden oversighted content
if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
$del = "<strong>$del</strong>";
}
$s .= " <tt>(<small>$del</small>)</tt> ";
}
$s .= " $link";
$s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
if( $row->rev_minor_edit ) {
$s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
}
if( !is_null( $size = $rev->getSize() ) && $rev->userCan( Revision::DELETED_TEXT ) ) {
$s .= ' ' . $this->mSkin->formatRevisionSize( $size );
}
$s .= $this->mSkin->revComment( $rev, false, true );
if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
$s .= ' <span class="updatedmarker">' . wfMsgHtml( 'updatedmarker' ) . '</span>';
}
if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
$s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
}
$tools = array();
if( !is_null( $next ) && is_object( $next ) ) {
if( $latest && $this->mTitle->userCan( 'rollback' ) && $this->mTitle->userCan( 'edit' ) ) {
$tools[] = '<span class="mw-rollback-link">'.$this->mSkin->buildRollbackLink( $rev ).'</span>';
}
if( $this->mTitle->quickUserCan( 'edit' ) && !$rev->isDeleted( Revision::DELETED_TEXT ) &&
!$next->rev_deleted & Revision::DELETED_TEXT )
{
# Create undo tooltip for the first (=latest) line only
$undoTooltip = $latest
? array( 'title' => wfMsg( 'tooltip-undo' ) )
: array();
$undolink = $this->mSkin->link(
$this->mTitle,
wfMsgHtml( 'editundo' ),
$undoTooltip,
array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
array( 'known', 'noclasses' )
);
$tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
}
}
if( $tools ) {
$s .= ' (' . implode( ' | ', $tools ) . ')';
}
wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
return "<li>$s</li>\n";
}
/**
* Create a link to view this revision of the page
* @param Revision $rev
* @returns string
*/
function revLink( $rev ) {
global $wgLang;
$date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
if( $rev->userCan( Revision::DELETED_TEXT ) ) {
$link = $this->mSkin->makeKnownLinkObj(
$this->mTitle, $date, "oldid=" . $rev->getId() );
} else {
$link = $date;
}
if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
return '<span class="history-deleted">' . $link . '</span>';
}
return $link;
}
/**
* Create a diff-to-current link for this revision for this page
* @param Revision $rev
* @param Bool $latest, this is the latest revision of the page?
* @returns string
*/
function curLink( $rev, $latest ) {
$cur = $this->message['cur'];
if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
return $cur;
} else {
return $this->mSkin->makeKnownLinkObj( $this->mTitle, $cur,
'diff=' . $this->mTitle->getLatestRevID() . "&oldid=" . $rev->getId() );
}
}
/**
* Create a diff-to-previous link for this revision for this page.
* @param Revision $prevRev, the previous revision
* @param mixed $next, the newer revision
* @param int $counter, what row on the history list this is
* @returns string
*/
function lastLink( $prevRev, $next, $counter ) {
$last = $this->message['last'];
# $next may either be a Row, null, or "unkown"
$nextRev = is_object($next) ? new Revision( $next ) : $next;
if( is_null($next) ) {
# Probably no next row
return $last;
} elseif( $next === 'unknown' ) {
# Next row probably exists but is unknown, use an oldid=prev link
return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
"diff=" . $prevRev->getId() . "&oldid=prev" );
} elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
return $last;
} else {
return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
"diff=" . $prevRev->getId() . "&oldid={$next->rev_id}" );
}
}
/**
* Create radio buttons for page history
*
* @param object $rev Revision
* @param bool $firstInList Is this version the first one?
* @param int $counter A counter of what row number we're at, counted from the top row = 1.
* @return string HTML output for the radio buttons
*/
function diffButtons( $rev, $firstInList, $counter ) {
if( $this->linesonpage > 1) {
$radio = array(
'type' => 'radio',
'value' => $rev->getId(),
);
if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
$radio['disabled'] = 'disabled';
}
/** @todo: move title texts to javascript */
if( $firstInList ) {
$first = Xml::element( 'input', array_merge(
$radio,
array(
'style' => 'visibility:hidden',
'name' => 'oldid' ) ) );
$checkmark = array( 'checked' => 'checked' );
} else {
if( $counter == 2 ) {
$checkmark = array( 'checked' => 'checked' );
} else {
$checkmark = array();
}
$first = Xml::element( 'input', array_merge(
$radio,
$checkmark,
array( 'name' => 'oldid' ) ) );
$checkmark = array();
}
$second = Xml::element( 'input', array_merge(
$radio,
$checkmark,
array( 'name' => 'diff' ) ) );
return $first . $second;
} else {
return '';
}
}
/**
* Fetch an array of revisions, specified by a given limit, offset and
* direction. This is now only used by the feeds. It was previously
* used by the main UI but that's now handled by the pager.
*/
function fetchRevisions($limit, $offset, $direction) {
$dbr = wfGetDB( DB_SLAVE );
if( $direction == PageHistory::DIR_PREV )
list($dirs, $oper) = array("ASC", ">=");
else /* $direction == PageHistory::DIR_NEXT */
list($dirs, $oper) = array("DESC", "<=");
if( $offset )
$offsets = array("rev_timestamp $oper '$offset'");
else
$offsets = array();
$page_id = $this->mTitle->getArticleID();
return $dbr->select( 'revision',
Revision::selectFields(),
array_merge(array("rev_page=$page_id"), $offsets),
__METHOD__,
array( 'ORDER BY' => "rev_timestamp $dirs",
'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
);
}
/**
* Output a subscription feed listing recent edits to this page.
* @param string $type
*/
function feed( $type ) {
global $wgFeedClasses, $wgRequest, $wgFeedLimit;
if( !FeedUtils::checkFeedOutput($type) ) {
return;
}
$feed = new $wgFeedClasses[$type](
$this->mTitle->getPrefixedText() . ' - ' .
wfMsgForContent( 'history-feed-title' ),
wfMsgForContent( 'history-feed-description' ),
$this->mTitle->getFullUrl( 'action=history' ) );
// Get a limit on number of feed entries. Provide a sane default
// of 10 if none is defined (but limit to $wgFeedLimit max)
$limit = $wgRequest->getInt( 'limit', 10 );
if( $limit > $wgFeedLimit || $limit < 1 ) {
$limit = 10;
}
$items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
$feed->outHeader();
if( $items ) {
foreach( $items as $row ) {
$feed->outItem( $this->feedItem( $row ) );
}
} else {
$feed->outItem( $this->feedEmpty() );
}
$feed->outFooter();
}
function feedEmpty() {
global $wgOut;
return new FeedItem(
wfMsgForContent( 'nohistory' ),
$wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
$this->mTitle->getFullUrl(),
wfTimestamp( TS_MW ),
'',
$this->mTitle->getTalkPage()->getFullUrl() );
}
/**
* Generate a FeedItem object from a given revision table row
* Borrows Recent Changes' feed generation functions for formatting;
* includes a diff to the previous revision (if any).
*
* @param $row
* @return FeedItem
*/
function feedItem( $row ) {
$rev = new Revision( $row );
$rev->setTitle( $this->mTitle );
$text = FeedUtils::formatDiffRow( $this->mTitle,
$this->mTitle->getPreviousRevisionID( $rev->getId() ),
$rev->getId(),
$rev->getTimestamp(),
$rev->getComment() );
if( $rev->getComment() == '' ) {
global $wgContLang;
$title = wfMsgForContent( 'history-feed-item-nocomment',
$rev->getUserText(),
$wgContLang->timeanddate( $rev->getTimestamp() ) );
} else {
$title = $rev->getUserText() . ": " . FeedItem::stripComment( $rev->getComment() );
}
return new FeedItem(
$title,
$text,
$this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
$rev->getTimestamp(),
$rev->getUserText(),
$this->mTitle->getTalkPage()->getFullUrl() );
}
}
/**
* @ingroup Pager
*/
class PageHistoryPager extends ReverseChronologicalPager {
public $mLastRow = false, $mPageHistory, $mTitle;
function __construct( $pageHistory, $year='', $month='' ) {
parent::__construct();
$this->mPageHistory = $pageHistory;
$this->mTitle =& $this->mPageHistory->mTitle;
$this->getDateCond( $year, $month );
}
function getQueryInfo() {
$queryInfo = array(
'tables' => array('revision'),
'fields' => Revision::selectFields(),
'conds' => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') )
);
wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
return $queryInfo;
}
function getIndexField() {
return 'rev_timestamp';
}
function formatRow( $row ) {
if( $this->mLastRow ) {
$latest = $this->mCounter == 1 && $this->mIsFirst;
$firstInList = $this->mCounter == 1;
$s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
$this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
} else {
$s = '';
}
$this->mLastRow = $row;
return $s;
}
function getStartBody() {
$this->mLastRow = false;
$this->mCounter = 1;
return '';
}
function getEndBody() {
if( $this->mLastRow ) {
$latest = $this->mCounter == 1 && $this->mIsFirst;
$firstInList = $this->mCounter == 1;
if( $this->mIsBackwards ) {
# Next row is unknown, but for UI reasons, probably exists if an offset has been specified
if( $this->mOffset == '' ) {
$next = null;
} else {
$next = 'unknown';
}
} else {
# The next row is the past-the-end row
$next = $this->mPastTheEndRow;
}
$s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
$this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
} else {
$s = '';
}
return $s;
}
}