pagehistory.php

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<?php
/**
 * Page history
 *
 * Split off from Article.php and Skin.php, 2003-12-22
 * @package MediaWiki
 */

/**
 * 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.
 *
 * @package MediaWiki
 */

class PageHistory {
	const DIR_PREV = 0;
	const DIR_NEXT = 1;
	
	var $mArticle, $mTitle, $mSkin;
	var $lastdate;
	var $linesonpage;
	var $mNotificationTimestamp;
	var $mLatestId = null;

	/**
	 * Construct a new PageHistory.
	 *
	 * @param Article $article
	 * @returns nothing
	 */
	function PageHistory($article) {
		global $wgUser;

		$this->mArticle =& $article;
		$this->mTitle =& $article->mTitle;
		$this->mNotificationTimestamp = NULL;
		$this->mSkin = $wgUser->getSkin();

		$this->defaultLimit = 50;
	}

	/**
	 * Print the history page for an article.
	 *
	 * @returns nothing
	 */
	function history() {
		global $wgOut, $wgRequest, $wgTitle;

		/*
		 * Allow client caching.
		 */

		if( $wgOut->checkLastModified( $this->mArticle->getTimestamp() ) )
			/* Client cache fresh and headers sent, nothing more to do. */
			return;

		$fname = 'PageHistory::history';
		wfProfileIn( $fname );

		/*
		 * Setup page variables.
		 */
		$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
		$wgOut->setArticleFlag( false );
		$wgOut->setArticleRelated( true );
		$wgOut->setRobotpolicy( 'noindex,nofollow' );
		$wgOut->setSyndicated( true );

		$logPage = Title::makeTitle( NS_SPECIAL, 'Log' );
		$logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ), 'page=' . $this->mTitle->getPrefixedUrl() );

		$subtitle = wfMsgHtml( 'revhistory' ) . '<br />' . $logLink;
		$wgOut->setSubtitle( $subtitle );

		$feedType = $wgRequest->getVal( 'feed' );
		if( $feedType ) {
			wfProfileOut( $fname );
			return $this->feed( $feedType );
		}

		/*
		 * Fail if article doesn't exist.
		 */
		if( !$this->mTitle->exists() ) {
			$wgOut->addWikiText( wfMsg( 'nohistory' ) );
			wfProfileOut( $fname );
			return;
		}

		$dbr =& wfGetDB(DB_SLAVE);

		/*
		 * Extract limit, the number of revisions to show, and
		 * offset, the timestamp to begin at, from the URL.
		 */
		$limit = $wgRequest->getInt('limit', $this->defaultLimit);
		if ( $limit <= 0 ) {
			$limit = $this->defaultLimit;
		} elseif ( $limit > 50000 ) {
			# Arbitrary maximum
			# Any more than this and we'll probably get an out of memory error
			$limit = 50000;
		}

		$offset = $wgRequest->getText('offset');

		/* Offset must be an integral. */
		if (!strlen($offset) || !preg_match("/^[0-9]+$/", $offset))
			$offset = 0;
#		$offset = $dbr->timestamp($offset);
		$dboffset = $offset === 0 ? 0 : $dbr->timestamp($offset);
		/*
		 * "go=last" means to jump to the last history page.
		 */
		if (($gowhere = $wgRequest->getText("go")) !== NULL) {
			$gourl = null;
			switch ($gowhere) {
			case "first":
				if (($lastid = $this->getLastOffsetForPaging($this->mTitle->getArticleID(), $limit)) === NULL)
					break;
				$gourl = $wgTitle->getLocalURL("action=history&limit={$limit}&offset=".
						wfTimestamp(TS_MW, $lastid));
				break;
			}

			if (!is_null($gourl)) {
				$wgOut->redirect($gourl);
				return;
			}
		}

		/*
		 * Fetch revisions.
		 *
		 * If the user clicked "previous", we retrieve the revisions backwards,
		 * then reverse them.  This is to avoid needing to know the timestamp of
		 * previous revisions when generating the URL.
		 */
		$direction = $this->getDirection();
		$revisions = $this->fetchRevisions($limit, $dboffset, $direction);
		$navbar = $this->makeNavbar($revisions, $offset, $limit, $direction);

		/*
		 * We fetch one more revision than needed to get the timestamp of the
		 * one after this page (and to know if it exists).
		 *
		 * linesonpage stores the actual number of lines.
		 */
		if (count($revisions) < $limit + 1)
			$this->linesonpage = count($revisions);
		else
			$this->linesonpage = count($revisions) - 1;

		/* Un-reverse revisions */
		if ($direction == PageHistory::DIR_PREV)
			$revisions = array_reverse($revisions);

		/*
		 * Print the top navbar.
		 */
		$s = $navbar;
		$s .= $this->beginHistoryList();
		$counter = 1;

		/*
		 * Print each revision, excluding the one-past-the-end, if any.
		 */
		foreach (array_slice($revisions, 0, $limit) as $i => $line) {
			$latest = !$i && $offset == 0;
			$firstInList = !$i;
			$next = isset( $revisions[$i + 1] ) ? $revisions[$i + 1 ] : null;
			$s .= $this->historyLine($line, $next, $counter, $this->getNotificationTimestamp(), $latest, $firstInList);
			$counter++;
		}

		/*
		 * End navbar.
		*/
		$s .= $this->endHistoryList();
		$s .= $navbar;

		$wgOut->addHTML( $s );
		wfProfileOut( $fname );
	}

	/** @todo document */
	function beginHistoryList() {
		global $wgTitle;
		$this->lastdate = '';
		$s = wfMsgExt( 'histlegend', array( 'parse') );
		$s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
		$prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());

		// The following line is SUPPOSED to have double-quotes around the
		// $prefixedkey variable, because htmlspecialchars() doesn't escape
		// single-quotes.
		//
		// On at least two occasions people have changed it to single-quotes,
		// which creates invalid HTML and incorrect display of the resulting
		// link.
		//
		// Please do not break this a third time. Thank you for your kind
		// consideration and cooperation.
		//
		$s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";

		$s .= $this->submitButton();
		$s .= '<ul id="pagehistory">' . "\n";
		return $s;
	}

	/** @todo document */
	function endHistoryList() {
		$s = '</ul>';
		$s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
		$s .= '</form>';
		return $s;
	}

	/** @todo document */
	function submitButton( $bits = array() ) {
		return ( $this->linesonpage > 0 )
			? wfElement( 'input', array_merge( $bits,
				array(
					'class'     => 'historysubmit',
					'type'      => 'submit',
					'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
					'title'     => wfMsg( 'tooltip-compareselectedversions' ),
					'value'     => wfMsg( 'compareselectedversions' ),
				) ) )
			: '';
	}

	/** @todo document */
	function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
		global $wgUser;
		$rev = new Revision( $row );
		$rev->setTitle( $this->mTitle );

		$s = '<li>';
		$curlink = $this->curLink( $rev, $latest );
		$lastlink = $this->lastLink( $rev, $next, $counter );
		$arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
		$link = $this->revLink( $rev );
		
		$user = $this->mSkin->userLink( $rev->getUser(), $rev->getUserText() )
				. $this->mSkin->userToolLinks( $rev->getUser(), $rev->getUserText() );
		
		$s .= "($curlink) ($lastlink) $arbitrary";
		
		if( $wgUser->isAllowed( 'deleterevision' ) ) {
			$revdel = Title::makeTitle( NS_SPECIAL, 'Revisiondelete' );
			if( $firstInList ) {
				// We don't currently handle well changing the top revision's settings
				$del = wfMsgHtml( 'rev-delundel' );
			} else {
				$del = $this->mSkin->makeKnownLinkObj( $revdel,
					wfMsg( 'rev-delundel' ),
					'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
					'&oldid=' . urlencode( $rev->getId() ) );
			}
			$s .= "(<small>$del</small>) ";
		}
		
		$s .= " $link <span class='history-user'>$user</span>";

		if( $row->rev_minor_edit ) {
			$s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
		}

		$s .= $this->mSkin->revComment( $rev );
		if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
			$s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
		}
		if( $row->rev_deleted & Revision::DELETED_TEXT ) {
			$s .= ' ' . wfMsgHtml( 'deletedrev' );
		}
		$s .= "</li>\n";

		return $s;
	}
	
	/** @todo document */
	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;
	}

	/** @todo document */
	function curLink( $rev, $latest ) {
		$cur = wfMsgExt( 'cur', array( 'escape') );
		if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
			return $cur;
		} else {
			return $this->mSkin->makeKnownLinkObj(
				$this->mTitle, $cur,
				'diff=' . $this->getLatestID() .
				"&oldid=" . $rev->getId() );
		}
	}

	/** @todo document */
	function lastLink( $rev, $next, $counter ) {
		$last = wfMsgExt( 'last', array( 'escape' ) );
		if( is_null( $next ) ) {
			if( $rev->getTimestamp() == $this->getEarliestOffset() ) {
				return $last;
			} else {
				// Cut off by paging; there are more behind us...
				return $this->mSkin->makeKnownLinkObj(
					$this->mTitle,
					$last,
					"diff=" . $rev->getId() . "&oldid=prev" );
			}
		} elseif( !$rev->userCan( Revision::DELETED_TEXT ) ) {
			return $last;
		} else {
			return $this->mSkin->makeKnownLinkObj(
				$this->mTitle,
				$last,
				"diff=" . $rev->getId() . "&oldid={$next->rev_id}"
				/*,
				'',
				'',
				"tabindex={$counter}"*/ );
		}
	}