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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 HistoryPage {
const DIR_PREV = 0;
const DIR_NEXT = 1;
/** Contains the Article object. Passed on construction. */
private $article;
/** The $article title object. Found on construction. */
private $title;
/** Shortcut to the user Skin object. */
private $skin;
/**
* Construct a new HistoryPage.
*
* @param $article Article
*/
function __construct( $article ) {
global $wgUser;
$this->article = $article;
$this->title = $article->getTitle();
$this->skin = $wgUser->getSkin();
$this->preCacheMessages();
}
/** Get the Article object we are working on. */
public function getArticle() {
return $this->article;
}
/** Get the Title object. */
public function getTitle() {
return $this->title;
}
/**
* 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
*/
private function preCacheMessages() {
// Precache various messages
if ( !isset( $this->message ) ) {
$msgs = array( 'cur', 'last', 'pipe-separator' );
foreach ( $msgs as $msg ) {
$this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
}
}
}
/**
* Print the history page for an article.
* @return nothing
*/
function history() {
global $wgOut, $wgRequest, $wgScript;
/**
* Allow client caching.
*/
if ( $wgOut->checkLastModified( $this->article->getTouched() ) )
return; // Client cache fresh and headers sent, nothing more to do.
wfProfileIn( __METHOD__ );
// Setup page variables.
$wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
$wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
$wgOut->setArticleFlag( false );
$wgOut->setArticleRelated( true );
$wgOut->setRobotPolicy( 'noindex,nofollow' );
$wgOut->setSyndicated( true );
$wgOut->setFeedAppendQuery( 'action=history' );
$wgOut->addModules( array( 'mediawiki.legacy.history', 'mediawiki.action.history' ) );
// Creation of a subtitle link pointing to [[Special:Log]]
$logPage = SpecialPage::getTitleFor( 'Log' );
$logLink = $this->skin->link(
$logPage,
wfMsgHtml( 'viewpagelogs' ),
array(),
array( 'page' => $this->title->getPrefixedText() ),
array( 'known', 'noclasses' )
);
$wgOut->setSubtitle( $logLink );
// Handle atom/RSS feeds.
$feedType = $wgRequest->getVal( 'feed' );
if ( $feedType ) {
wfProfileOut( __METHOD__ );
return $this->feed( $feedType );
}
// Fail nicely if article doesn't exist.
if ( !$this->title->exists() ) {
$wgOut->addWikiMsg( 'nohistory' );
# show deletion/move log if there is an entry
LogEventsList::showLogExtract(
$wgOut,
array( 'delete', 'move' ),
$this->title->getPrefixedText(),
'',
array( 'lim' => 10,
'conds' => array( "log_action != 'revision'" ),
'showIfEmpty' => false,
'msgKey' => array( 'moveddeleted-notice' )
)
);
wfProfileOut( __METHOD__ );
return;
}
/**
* Add date selector to quickly get to a certain time
*/
$year = $wgRequest->getInt( 'year' );
$month = $wgRequest->getInt( 'month' );
$tagFilter = $wgRequest->getVal( 'tagfilter' );
$tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
/**
* Option to show only revisions that have been (partially) hidden via RevisionDelete
*/
if ( $wgRequest->getBool( 'deleted' ) ) {
$conds = array( "rev_deleted != '0'" );
} else {
$conds = array();
}
$checkDeleted = Xml::checkLabel( wfMsg( 'history-show-deleted' ),
'deleted', 'mw-show-deleted-only', $wgRequest->getBool( 'deleted' ) ) . "\n";
// Add the general form
$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' )
) .
Html::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
Html::hidden( 'action', 'history' ) . "\n" .
Xml::dateMenu( $year, $month ) . ' ' .
( $tagSelector ? ( implode( ' ', $tagSelector ) . ' ' ) : '' ) .
$checkDeleted .
Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
'</fieldset></form>'
);
wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
// Create and output the list.
$pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
$wgOut->addHTML(
$pager->getNavigationBar() .
$pager->getBody() .
$pager->getNavigationBar()
);
$wgOut->preventClickjacking( $pager->getPreventClickjacking() );
wfProfileOut( __METHOD__ );
}
/**
* 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.
*
* @param $limit Integer: the limit number of revisions to get
* @param $offset Integer
* @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
* @return ResultWrapper
*/
function fetchRevisions( $limit, $offset, $direction ) {
$dbr = wfGetDB( DB_SLAVE );
if ( $direction == HistoryPage::DIR_PREV ) {
list( $dirs, $oper ) = array( "ASC", ">=" );
} else { /* $direction == HistoryPage::DIR_NEXT */
list( $dirs, $oper ) = array( "DESC", "<=" );
}
if ( $offset ) {
$offsets = array( "rev_timestamp $oper '$offset'" );
} else {
$offsets = array();
}
$page_id = $this->title->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 $type String: feed type
*/
function feed( $type ) {
global $wgFeedClasses, $wgRequest, $wgFeedLimit;
if ( !FeedUtils::checkFeedOutput( $type ) ) {
return;
}
$feed = new $wgFeedClasses[$type](
$this->title->getPrefixedText() . ' - ' .
wfMsgForContent( 'history-feed-title' ),
wfMsgForContent( 'history-feed-description' ),
$this->title->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, HistoryPage::DIR_NEXT );
// Generate feed elements enclosed between header and footer.
$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->title->getFullUrl(),
wfTimestamp( TS_MW ),
'',
$this->title->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 Object: database row
* @return FeedItem
*/
function feedItem( $row ) {
$rev = new Revision( $row );
$rev->setTitle( $this->title );
$text = FeedUtils::formatDiffRow(
$this->title,
$this->title->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() ),
$wgContLang->date( $rev->getTimestamp() ),
$wgContLang->time( $rev->getTimestamp() )
);
} else {
$title = $rev->getUserText() .
wfMsgForContent( 'colon-separator' ) .
FeedItem::stripComment( $rev->getComment() );
}
return new FeedItem(
$title,
$text,
$this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
$rev->getTimestamp(),
$rev->getUserText(),
$this->title->getTalkPage()->getFullUrl()
);
}
}
/**
* @ingroup Pager
*/
class HistoryPager extends ReverseChronologicalPager {
public $lastRow = false, $counter, $historyPage, $title, $buttons, $conds;
protected $oldIdChecked;
protected $preventClickjacking = false;
function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
parent::__construct();
$this->historyPage = $historyPage;
$this->title = $this->historyPage->getTitle();
$this->tagFilter = $tagFilter;
$this->getDateCond( $year, $month );
$this->conds = $conds;
}
// For hook compatibility...
function getArticle() {
return $this->historyPage->getArticle();
}
function getTitle() {
return $this->title;
}
function getSqlComment() {
if ( $this->conds ) {
return 'history page filtered'; // potentially slow, see CR r58153
} else {
return 'history page unfiltered';
}
}
function getQueryInfo() {
$queryInfo = array(
'tables' => array( 'revision' ),
'fields' => Revision::selectFields(),
'conds' => array_merge(
array( 'rev_page' => $this->title->getArticleID() ),
$this->conds ),
'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
);
ChangeTags::modifyDisplayQuery(
$queryInfo['tables'],
$queryInfo['fields'],
$queryInfo['conds'],
$queryInfo['join_conds'],
$queryInfo['options'],
$this->tagFilter
);
wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
return $queryInfo;
}
function getIndexField() {
return 'rev_timestamp';
}
function formatRow( $row ) {
if ( $this->lastRow ) {
$latest = ( $this->counter == 1 && $this->mIsFirst );
$firstInList = $this->counter == 1;
$this->counter++;
$s = $this->historyLine( $this->lastRow, $row,
$this->title->getNotificationTimestamp(), $latest, $firstInList );
} else {
$s = '';
}
$this->lastRow = $row;
return $s;
}
/**
* Creates begin of history list with a submit button
*
* @return string HTML output
*/
function getStartBody() {
global $wgScript, $wgUser, $wgOut;
$this->lastRow = false;
$this->counter = 1;
$this->oldIdChecked = 0;
$wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
$s = Html::openElement( 'form', array( 'action' => $wgScript,
'id' => 'mw-history-compare' ) ) . "\n";
$s .= Html::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
$s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
$s .= '<div>' . $this->submitButton( wfMsg( 'compareselectedversions' ),
array( 'class' => 'historysubmit' ) ) . "\n";
$this->buttons = '<div>';
$this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions' ),
array( 'class' => 'historysubmit' )
+ Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' )
) . "\n";
if ( $wgUser->isAllowed( 'deleterevision' ) ) {
$s .= $this->getRevisionButton( 'revisiondelete', 'showhideselectedversions' );
}
$this->buttons .= '</div>';
$s .= '</div><ul id="pagehistory">' . "\n";
return $s;
}
private function getRevisionButton( $name, $msg ) {
$this->preventClickjacking();
# Note bug #20966, <button> is non-standard in IE<8
$element = Html::element( 'button',
array(
'type' => 'submit',
'name' => $name,
'value' => '1',
'class' => "mw-history-$name-button",
),
wfMsg( $msg )
) . "\n";
$this->buttons .= $element;
return $element;
}
function getEndBody() {
if ( $this->lastRow ) {
$latest = $this->counter == 1 && $this->mIsFirst;
$firstInList = $this->counter == 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;
}
$this->counter++;
$s = $this->historyLine( $this->lastRow, $next,
$this->title->getNotificationTimestamp(), $latest, $firstInList );
} else {
$s = '';
}
$s .= "</ul>\n";
# Add second buttons only if there is more than one rev
if ( $this->getNumRows() > 2 ) {
$s .= $this->buttons;
}
$s .= '</form>';
return $s;
}
/**
* Creates a submit button
*
* @param $message String: text of the submit button, will be escaped
* @param $attributes Array: 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->getNumRows() > 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 Object: the database row corresponding to the previous line.
* @param $next Mixed: the database row corresponding to the next line.
* @param $notificationtimestamp
* @param $latest Boolean: whether this row corresponds to the page's latest revision.
* @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
* @return String: HTML output for the row
*/
function historyLine( $row, $next, $notificationtimestamp = false,
$latest = false, $firstInList = false )
{
global $wgUser, $wgLang;
$rev = new Revision( $row );
$rev->setTitle( $this->title );
$curlink = $this->curLink( $rev, $latest );
$lastlink = $this->lastLink( $rev, $next );
$diffButtons = $this->diffButtons( $rev, $firstInList );
$histLinks = Html::rawElement(
'span',
array( 'class' => 'mw-history-histlinks' ),
'(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
);
$s = $histLinks . $diffButtons;
$link = $this->revLink( $rev );
$classes = array();
$del = '';
// Show checkboxes for each revision
if ( $wgUser->isAllowed( 'deleterevision' ) ) {
$this->preventClickjacking();
// If revision was hidden from sysops, disable the checkbox
if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
$del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
// Otherwise, enable the checkbox...
} else {
$del = Xml::check( 'showhiderevisions', false,
array( 'name' => 'ids[' . $rev->getId() . ']' ) );
}
// User can only view deleted revisions...
} elseif ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) {
// If revision was hidden from sysops, disable the link
if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
$cdel = $this->getSkin()->revDeleteLinkDisabled( false );
// Otherwise, show the link...
} else {
$query = array( 'type' => 'revision',
'target' => $this->title->getPrefixedDbkey(), 'ids' => $rev->getId() );
$del .= $this->getSkin()->revDeleteLink( $query,
$rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
}
}
if ( $del ) {
$s .= " $del ";
}
$dirmark = $wgLang->getDirMark();
$s .= " $link";
$s .= $dirmark;
$s .= " <span class='history-user'>" .
$this->getSkin()->revUserTools( $rev, true ) . "</span>";
$s .= $dirmark;
if ( $rev->isMinor() ) {
$s .= ' ' . ChangesList::flag( 'minor' );
}
if ( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
$s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
}
$s .= $this->getSkin()->revComment( $rev, false, true );
if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
$s .= ' <span class="updatedmarker">' . wfMsgHtml( 'updatedmarker' ) . '</span>';
}
$tools = array();
# Rollback and undo links
if ( !is_null( $next ) && is_object( $next ) ) {
if ( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
$this->preventClickjacking();
$tools[] = '<span class="mw-rollback-link">' .
$this->getSkin()->buildRollbackLink( $rev ) . '</span>';
}
if ( $this->title->quickUserCan( 'edit' )
&& !$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->getSkin()->link(
$this->title,
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 .= ' (' . $wgLang->pipeList( $tools ) . ')';
}
# Tags
list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
$classes = array_merge( $classes, $newClasses );
$s .= " $tagSummary";
wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
$attribs = array();
if ( $classes ) {
$attribs['class'] = implode( ' ', $classes );
}
return Xml::tags( 'li', $attribs, $s ) . "\n";
}
/**
* Create a link to view this revision of the page
*
* @param $rev Revision
* @return String
*/
function revLink( $rev ) {
global $wgLang;
$date = $wgLang->timeanddate( wfTimestamp( TS_MW, $rev->getTimestamp() ), true );
$date = htmlspecialchars( $date );
if ( $rev->userCan( Revision::DELETED_TEXT ) ) {
$link = $this->getSkin()->link(
$this->title,
$date,
array(),
array( 'oldid' => $rev->getId() ),
array( 'known', 'noclasses' )
);
} else {
$link = $date;
}
if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
$link = "<span class=\"history-deleted\">$link</span>";
}
return $link;
}
/**
* Create a diff-to-current link for this revision for this page
*
* @param $rev Revision
* @param $latest Boolean: this is the latest revision of the page?
* @return String
*/
function curLink( $rev, $latest ) {
$cur = $this->historyPage->message['cur'];
if ( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
return $cur;
} else {
return $this->getSkin()->link(
$this->title,
$cur,
array(),
array(
'diff' => $this->title->getLatestRevID(),
'oldid' => $rev->getId()
),
array( 'known', 'noclasses' )
);
}
}
/**
* Create a diff-to-previous link for this revision for this page.
*
* @param $prevRev Revision: the previous revision
* @param $next Mixed: the newer revision
* @return String
*/
function lastLink( $prevRev, $next ) {
$last = $this->historyPage->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->getSkin()->link(
$this->title,
$last,
array(),
array(
'diff' => $prevRev->getId(),
'oldid' => 'prev'
),
array( 'known', 'noclasses' )
);
} elseif ( !$prevRev->userCan( Revision::DELETED_TEXT )
|| !$nextRev->userCan( Revision::DELETED_TEXT ) )
{
return $last;
} else {
return $this->getSkin()->link(
$this->title,
$last,
array(),
array(
'diff' => $prevRev->getId(),
'oldid' => $next->rev_id
),
array( 'known', 'noclasses' )
);
}
}
/**
* Create radio buttons for page history
*
* @param $rev Revision object
* @param $firstInList Boolean: is this version the first one?
*
* @return String: HTML output for the radio buttons
*/
function diffButtons( $rev, $firstInList ) {
if ( $this->getNumRows() > 1 ) {
$id = $rev->getId();
$radio = array( 'type' => 'radio', 'value' => $id );
/** @todo: move title texts to javascript */
if ( $firstInList ) {
$first = Xml::element( 'input',
array_merge( $radio, array(
'style' => 'visibility:hidden',
'name' => 'oldid',
'id' => 'mw-oldid-null' ) )
);
$checkmark = array( 'checked' => 'checked' );
} else {
# Check visibility of old revisions
if ( !$rev->userCan( Revision::DELETED_TEXT ) ) {
$radio['disabled'] = 'disabled';
$checkmark = array(); // We will check the next possible one
} elseif ( !$this->oldIdChecked ) {
$checkmark = array( 'checked' => 'checked' );
$this->oldIdChecked = $id;
} else {
$checkmark = array();
}
$first = Xml::element( 'input',
array_merge( $radio, $checkmark, array(
'name' => 'oldid',
'id' => "mw-oldid-$id" ) ) );
$checkmark = array();
}
$second = Xml::element( 'input',
array_merge( $radio, $checkmark, array(
'name' => 'diff',
'id' => "mw-diff-$id" ) ) );
return $first . $second;
} else {
return '';
}
}
/**
* This is called if a write operation is possible from the generated HTML
*/
function preventClickjacking( $enable = true ) {
$this->preventClickjacking = $enable;
}
/**
* Get the "prevent clickjacking" flag
*/
function getPreventClickjacking() {
return $this->preventClickjacking;
}
}
/**
* Backwards-compatibility aliases
*/
class PageHistory extends HistoryPage {}
class PageHistoryPager extends HistoryPager {}