SpecialMergeHistory.php

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<?php
class SpecialMergeHistory extends SpecialPage {
    protected $mAction;

    protected $mTarget;

    protected $mDest;

    protected $mTimestamp;

    protected $mTargetID;

    protected $mDestID;

    protected $mComment;

    protected $mMerge;

    protected $mSubmitted;

    protected $mTargetObj;

    protected $mDestObj;

    public function __construct() {
        parent::__construct( 'MergeHistory', 'mergehistory' );
    }

    private function loadRequestParams() {
        $request = $this->getRequest();
        $this->mAction = $request->getVal( 'action' );
        $this->mTarget = $request->getVal( 'target' );
        $this->mDest = $request->getVal( 'dest' );
        $this->mSubmitted = $request->getBool( 'submitted' );

        $this->mTargetID = intval( $request->getVal( 'targetID' ) );
        $this->mDestID = intval( $request->getVal( 'destID' ) );
        $this->mTimestamp = $request->getVal( 'mergepoint' );
        if ( !preg_match( '/[0-9]{14}/', $this->mTimestamp ) ) {
            $this->mTimestamp = '';
        }
        $this->mComment = $request->getText( 'wpComment' );

        $this->mMerge = $request->wasPosted()
            && $this->getUser()->matchEditToken( $request->getVal( 'wpEditToken' ) );

        // target page
        if ( $this->mSubmitted ) {
            $this->mTargetObj = Title::newFromURL( $this->mTarget );
            $this->mDestObj = Title::newFromURL( $this->mDest );
        } else {
            $this->mTargetObj = null;
            $this->mDestObj = null;
        }
        $this->preCacheMessages();
    }

    function preCacheMessages() {
        // Precache various messages
        if ( !isset( $this->message ) ) {
            $this->message['last'] = $this->msg( 'last' )->escaped();
        }
    }

    public function execute( $par ) {
        $this->checkPermissions();
        $this->checkReadOnly();

        $this->loadRequestParams();

        $this->setHeaders();
        $this->outputHeader();

        if ( $this->mTargetID && $this->mDestID && $this->mAction == 'submit' && $this->mMerge ) {
            $this->merge();

            return;
        }

        if ( !$this->mSubmitted ) {
            $this->showMergeForm();

            return;
        }

        $errors = array();
        if ( !$this->mTargetObj instanceof Title ) {
            $errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();
        } elseif ( !$this->mTargetObj->exists() ) {
            $errors[] = $this->msg( 'mergehistory-no-source',
                wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
            )->parseAsBlock();
        }

        if ( !$this->mDestObj instanceof Title ) {
            $errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();
        } elseif ( !$this->mDestObj->exists() ) {
            $errors[] = $this->msg( 'mergehistory-no-destination',
                wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
            )->parseAsBlock();
        }

        if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
            $errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();
        }

        if ( count( $errors ) ) {
            $this->showMergeForm();
            $this->getOutput()->addHTML( implode( "\n", $errors ) );
        } else {
            $this->showHistory();
        }
    }

    function showMergeForm() {
        $this->getOutput()->addWikiMsg( 'mergehistory-header' );

        $this->getOutput()->addHTML(
            Xml::openElement( 'form', array(
                'method' => 'get',
                'action' => wfScript() ) ) .
                '<fieldset>' .
                Xml::element( 'legend', array(),
                    $this->msg( 'mergehistory-box' )->text() ) .
                Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
                Html::hidden( 'submitted', '1' ) .
                Html::hidden( 'mergepoint', $this->mTimestamp ) .
                Xml::openElement( 'table' ) .
                '<tr>
                <td>' . Xml::label( $this->msg( 'mergehistory-from' )->text(), 'target' ) . '</td>
                <td>' . Xml::input( 'target', 30, $this->mTarget, array( 'id' => 'target' ) ) . '</td>
            </tr><tr>
                <td>' . Xml::label( $this->msg( 'mergehistory-into' )->text(), 'dest' ) . '</td>
                <td>' . Xml::input( 'dest', 30, $this->mDest, array( 'id' => 'dest' ) ) . '</td>
            </tr><tr><td>' .
                Xml::submitButton( $this->msg( 'mergehistory-go' )->text() ) .
                '</td></tr>' .
                Xml::closeElement( 'table' ) .
                '</fieldset>' .
                '</form>'
        );
    }

    private function showHistory() {
        $this->showMergeForm();

        # List all stored revisions
        $revisions = new MergeHistoryPager(
            $this, array(), $this->mTargetObj, $this->mDestObj
        );
        $haveRevisions = $revisions && $revisions->getNumRows() > 0;

        $out = $this->getOutput();
        $titleObj = $this->getPageTitle();
        $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
        # Start the form here
        $top = Xml::openElement(
            'form',
            array(
                'method' => 'post',
                'action' => $action,
                'id' => 'merge'
            )
        );
        $out->addHTML( $top );

        if ( $haveRevisions ) {
            # Format the user-visible controls (comment field, submission button)
            # in a nice little table
            $table =
                Xml::openElement( 'fieldset' ) .
                    $this->msg( 'mergehistory-merge', $this->mTargetObj->getPrefixedText(),
                        $this->mDestObj->getPrefixedText() )->parse() .
                    Xml::openElement( 'table', array( 'id' => 'mw-mergehistory-table' ) ) .
                    '<tr>
                        <td class="mw-label">' .
                    Xml::label( $this->msg( 'mergehistory-reason' )->text(), 'wpComment' ) .
                    '</td>
                    <td class="mw-input">' .
                    Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment' ) ) .
                    '</td>
                    </tr>
                    <tr>
                        <td>&#160;</td>
                        <td class="mw-submit">' .
                    Xml::submitButton(
                        $this->msg( 'mergehistory-submit' )->text(),
                        array( 'name' => 'merge', 'id' => 'mw-merge-submit' )
                    ) .
                    '</td>
                    </tr>' .
                    Xml::closeElement( 'table' ) .
                    Xml::closeElement( 'fieldset' );

            $out->addHTML( $table );
        }

        $out->addHTML(
            '<h2 id="mw-mergehistory">' .
                $this->msg( 'mergehistory-list' )->escaped() . "</h2>\n"
        );

        if ( $haveRevisions ) {
            $out->addHTML( $revisions->getNavigationBar() );
            $out->addHTML( '<ul>' );
            $out->addHTML( $revisions->getBody() );
            $out->addHTML( '</ul>' );
            $out->addHTML( $revisions->getNavigationBar() );
        } else {
            $out->addWikiMsg( 'mergehistory-empty' );
        }

        # Show relevant lines from the merge log:
        $mergeLogPage = new LogPage( 'merge' );
        $out->addHTML( '<h2>' . $mergeLogPage->getName()->escaped() . "</h2>\n" );
        LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );

        # When we submit, go by page ID to avoid some nasty but unlikely collisions.
        # Such would happen if a page was renamed after the form loaded, but before submit
        $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
        $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
        $misc .= Html::hidden( 'target', $this->mTarget );
        $misc .= Html::hidden( 'dest', $this->mDest );
        $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
        $misc .= Xml::closeElement( 'form' );
        $out->addHTML( $misc );

        return true;
    }

    function formatRevisionRow( $row ) {
        $rev = new Revision( $row );

        $stxt = '';
        $last = $this->message['last'];

        $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
        $checkBox = Xml::radio( 'mergepoint', $ts, ( $this->mTimestamp === $ts ) );

        $user = $this->getUser();

        $pageLink = Linker::linkKnown(
            $rev->getTitle(),
            htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) ),
            array(),
            array( 'oldid' => $rev->getId() )
        );
        if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
            $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
        }

        # Last link
        if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
            $last = $this->message['last'];
        } elseif ( isset( $this->prevId[$row->rev_id] ) ) {
            $last = Linker::linkKnown(
                $rev->getTitle(),
                $this->message['last'],
                array(),
                array(
                    'diff' => $row->rev_id,
                    'oldid' => $this->prevId[$row->rev_id]
                )
            );
        }

        $userLink = Linker::revUserTools( $rev );

        $size = $row->rev_len;
        if ( !is_null( $size ) ) {
            $stxt = Linker::formatRevisionSize( $size );
        }
        $comment = Linker::revComment( $rev );

        return Html::rawElement( 'li', array(),
            $this->msg( 'mergehistory-revisionrow' )
                ->rawParams( $checkBox, $last, $pageLink, $userLink, $stxt, $comment )->escaped() );
    }

    function merge() {
        # Get the titles directly from the IDs, in case the target page params
        # were spoofed. The queries are done based on the IDs, so it's best to
        # keep it consistent...
        $targetTitle = Title::newFromID( $this->mTargetID );
        $destTitle = Title::newFromID( $this->mDestID );
        if ( is_null( $targetTitle ) || is_null( $destTitle ) ) {
            return false; // validate these
        }
        if ( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
            return false;
        }
        # Verify that this timestamp is valid
        # Must be older than the destination page
        $dbw = wfGetDB( DB_MASTER );
        # Get timestamp into DB format
        $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp( $this->mTimestamp ) : '';
        # Max timestamp should be min of destination page
        $maxtimestamp = $dbw->selectField(
            'revision',
            'MIN(rev_timestamp)',
            array( 'rev_page' => $this->mDestID ),
            __METHOD__
        );
        # Destination page must exist with revisions
        if ( !$maxtimestamp ) {
            $this->getOutput()->addWikiMsg( 'mergehistory-fail' );

            return false;
        }
        # Get the latest timestamp of the source
        $lasttimestamp = $dbw->selectField(
            array( 'page', 'revision' ),
            'rev_timestamp',
            array( 'page_id' => $this->mTargetID, 'page_latest = rev_id' ),
            __METHOD__
        );
        # $this->mTimestamp must be older than $maxtimestamp
        if ( $this->mTimestamp >= $maxtimestamp ) {
            $this->getOutput()->addWikiMsg( 'mergehistory-fail' );

            return false;
        }
        # Get the timestamp pivot condition
        if ( $this->mTimestamp ) {
            $timewhere = "rev_timestamp <= {$this->mTimestamp}";
            $timestampLimit = wfTimestamp( TS_MW, $this->mTimestamp );
        } else {
            $timewhere = "rev_timestamp <= {$maxtimestamp}";
            $timestampLimit = wfTimestamp( TS_MW, $lasttimestamp );
        }
        # Check that there are not too many revisions to move
        $limit = 5000; // avoid too much slave lag
        $count = $dbw->selectRowCount( 'revision', '1',
            array( 'rev_page' => $this->mTargetID, $timewhere ),
            __METHOD__,
            array( 'LIMIT' => $limit + 1 )
        );
        if ( $count > $limit ) {
            $this->getOutput()->addWikiMsg( 'mergehistory-fail-toobig' );

            return false;
        }
        # Do the moving...
        $dbw->update(
            'revision',
            array( 'rev_page' => $this->mDestID ),
            array( 'rev_page' => $this->mTargetID, $timewhere ),
            __METHOD__
        );

        $count = $dbw->affectedRows();
        # Make the source page a redirect if no revisions are left
        $haveRevisions = $dbw->selectField(
            'revision',
            'rev_timestamp',
            array( 'rev_page' => $this->mTargetID ),
            __METHOD__,
            array( 'FOR UPDATE' )
        );
        if ( !$haveRevisions ) {
            if ( $this->mComment ) {
                $comment = $this->msg(
                    'mergehistory-comment',
                    $targetTitle->getPrefixedText(),
                    $destTitle->getPrefixedText(),
                    $this->mComment
                )->inContentLanguage()->text();
            } else {
                $comment = $this->msg(
                    'mergehistory-autocomment',
                    $targetTitle->getPrefixedText(),
                    $destTitle->getPrefixedText()
                )->inContentLanguage()->text();
            }

            $contentHandler = ContentHandler::getForTitle( $targetTitle );
            $redirectContent = $contentHandler->makeRedirectContent( $destTitle );

            if ( $redirectContent ) {
                $redirectPage = WikiPage::factory( $targetTitle );
                $redirectRevision = new Revision( array(
                    'title' => $targetTitle,
                    'page' => $this->mTargetID,
                    'comment' => $comment,
                    'content' => $redirectContent ) );
                $redirectRevision->insertOn( $dbw );
                $redirectPage->updateRevisionOn( $dbw, $redirectRevision );

                # Now, we record the link from the redirect to the new title.
                # It should have no other outgoing links...
                $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
                $dbw->insert( 'pagelinks',
                    array(
                        'pl_from' => $this->mDestID,
                        'pl_from_namespace' => $destTitle->getNamespace(),
                        'pl_namespace' => $destTitle->getNamespace(),
                        'pl_title' => $destTitle->getDBkey() ),
                    __METHOD__
                );
            } else {
                // would be nice to show a warning if we couldn't create a redirect
            }
        } else {
            $targetTitle->invalidateCache(); // update histories
        }
        $destTitle->invalidateCache(); // update histories
        # Check if this did anything
        if ( !$count ) {
            $this->getOutput()->addWikiMsg( 'mergehistory-fail' );

            return false;
        }
        # Update our logs
        $log = new LogPage( 'merge' );
        $log->addEntry(
            'merge', $targetTitle, $this->mComment,
            array( $destTitle->getPrefixedText(), $timestampLimit ), $this->getUser()
        );

        # @todo message should use redirect=no
        $this->getOutput()->addWikiText( $this->msg( 'mergehistory-success',
            $targetTitle->getPrefixedText(), $destTitle->getPrefixedText() )->numParams(
            $count )->text() );

        wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );

        return true;
    }

    protected function getGroupName() {
        return 'pagetools';
    }
}

class MergeHistoryPager extends ReverseChronologicalPager {
    public $mForm;

    public $mConds;

    function __construct( $form, $conds, $source, $dest ) {
        $this->mForm = $form;
        $this->mConds = $conds;
        $this->title = $source;
        $this->articleID = $source->getArticleID();

        $dbr = wfGetDB( DB_SLAVE );
        $maxtimestamp = $dbr->selectField(
            'revision',
            'MIN(rev_timestamp)',
            array( 'rev_page' => $dest->getArticleID() ),
            __METHOD__
        );
        $this->maxTimestamp = $maxtimestamp;

        parent::__construct( $form->getContext() );
    }

    function getStartBody() {
        wfProfileIn( __METHOD__ );
        # Do a link batch query
        $this->mResult->seek( 0 );
        $batch = new LinkBatch();
        # Give some pointers to make (last) links
        $this->mForm->prevId = array();
        foreach ( $this->mResult as $row ) {
            $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
            $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );

            $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
            if ( $rev_id > $row->rev_id ) {
                $this->mForm->prevId[$rev_id] = $row->rev_id;
            } elseif ( $rev_id < $row->rev_id ) {
                $this->mForm->prevId[$row->rev_id] = $rev_id;
            }

            $rev_id = $row->rev_id;
        }

        $batch->execute();
        $this->mResult->seek( 0 );

        wfProfileOut( __METHOD__ );

        return '';
    }

    function formatRow( $row ) {
        return $this->mForm->formatRevisionRow( $row );
    }

    function getQueryInfo() {
        $conds = $this->mConds;
        $conds['rev_page'] = $this->articleID;
        $conds[] = "rev_timestamp < " . $this->mDb->addQuotes( $this->maxTimestamp );

        return array(
            'tables' => array( 'revision', 'page', 'user' ),
            'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
            'conds' => $conds,
            'join_conds' => array(
                'page' => Revision::pageJoinCond(),
                'user' => Revision::userJoinCond() )
        );
    }

    function getIndexField() {
        return 'rev_timestamp';
    }
}