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<?php
/**
*
*
* Created on Dec 29, 2015
*
* Copyright © 2015 Geoffrey Mon <geofbot@gmail.com>
*
* 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
*/
/**
* Handles the backend logic of merging the histories of two
* pages.
*
* @since 1.27
*/
class MergeHistory {
/** @const int Maximum number of revisions that can be merged at once (avoid too much slave lag) */
const REVISION_LIMIT = 5000;
/** @var Title Page from which history will be merged */
protected $source;
/** @var Title Page to which history will be merged */
protected $dest;
/** @var DatabaseBase Database that we are using */
protected $dbw;
/** @var MWTimestamp Maximum timestamp that we can use (oldest timestamp of dest) */
protected $maxTimestamp;
/** @var string SQL WHERE condition that selects source revisions to insert into destination */
protected $timeWhere;
/** @var MWTimestamp|bool Timestamp upto which history from the source will be merged */
protected $timestampLimit;
/** @var integer Number of revisions merged (for Special:MergeHistory success message) */
protected $revisionsMerged;
/**
* MergeHistory constructor.
* @param Title $source Page from which history will be merged
* @param Title $dest Page to which history will be merged
* @param string|bool $timestamp Timestamp up to which history from the source will be merged
*/
public function __construct( Title $source, Title $dest, $timestamp = false ) {
// Save the parameters
$this->source = $source;
$this->dest = $dest;
// Get the database
$this->dbw = wfGetDB( DB_MASTER );
// Max timestamp should be min of destination page
$firstDestTimestamp = $this->dbw->selectField(
'revision',
'MIN(rev_timestamp)',
[ 'rev_page' => $this->dest->getArticleID() ],
__METHOD__
);
$this->maxTimestamp = new MWTimestamp( $firstDestTimestamp );
// Get the timestamp pivot condition
try {
if ( $timestamp ) {
// If we have a requested timestamp, use the
// latest revision up to that point as the insertion point
$mwTimestamp = new MWTimestamp( $timestamp );
$lastWorkingTimestamp = $this->dbw->selectField(
'revision',
'MAX(rev_timestamp)',
[
'rev_timestamp <= ' . $this->dbw->timestamp( $mwTimestamp ),
'rev_page' => $this->source->getArticleID()
],
__METHOD__
);
$mwLastWorkingTimestamp = new MWTimestamp( $lastWorkingTimestamp );
$timeInsert = $mwLastWorkingTimestamp;
$this->timestampLimit = $mwLastWorkingTimestamp;
} else {
// If we don't, merge entire source page history into the
// beginning of destination page history
// Get the latest timestamp of the source
$lastSourceTimestamp = $this->dbw->selectField(
[ 'page', 'revision' ],
'rev_timestamp',
[ 'page_id' => $this->source->getArticleID(),
'page_latest = rev_id'
],
__METHOD__
);
$lasttimestamp = new MWTimestamp( $lastSourceTimestamp );
$timeInsert = $this->maxTimestamp;
$this->timestampLimit = $lasttimestamp;
}
$this->timeWhere = "rev_timestamp <= {$this->dbw->timestamp( $timeInsert )}";
} catch ( TimestampException $ex ) {
// The timestamp we got is screwed up and merge cannot continue
// This should be detected by $this->isValidMerge()
$this->timestampLimit = false;
}
}
/**
* Get the number of revisions that will be moved
* @return int
*/
public function getRevisionCount() {
$count = $this->dbw->selectRowCount( 'revision', '1',
[ 'rev_page' => $this->source->getArticleID(), $this->timeWhere ],
__METHOD__,
[ 'LIMIT' => self::REVISION_LIMIT + 1 ]
);
return $count;
}
/**
* Get the number of revisions that were moved
* Used in the SpecialMergeHistory success message
* @return int
*/
public function getMergedRevisionCount() {
return $this->revisionsMerged;
}
/**
* Check if the merge is possible
* @param User $user
* @param string $reason
* @return Status
*/
public function checkPermissions( User $user, $reason ) {
$status = new Status();
// Check if user can edit both pages
$errors = wfMergeErrorArrays(
$this->source->getUserPermissionsErrors( 'edit', $user ),
$this->dest->getUserPermissionsErrors( 'edit', $user )
);
// Convert into a Status object
if ( $errors ) {
foreach ( $errors as $error ) {
call_user_func_array( [ $status, 'fatal' ], $error );
}
}
// Anti-spam
if ( EditPage::matchSummarySpamRegex( $reason ) !== false ) {
// This is kind of lame, won't display nice
$status->fatal( 'spamprotectiontext' );
}
// Check mergehistory permission
if ( !$user->isAllowed( 'mergehistory' ) ) {
// User doesn't have the right to merge histories
$status->fatal( 'mergehistory-fail-permission' );
}
return $status;
}
/**
* Does various sanity checks that the merge is
* valid. Only things based on the two pages
* should be checked here.
*
* @return Status
*/
public function isValidMerge() {
$status = new Status();
// If either article ID is 0, then revisions cannot be reliably selected
if ( $this->source->getArticleID() === 0 ) {
$status->fatal( 'mergehistory-fail-invalid-source' );
}
if ( $this->dest->getArticleID() === 0 ) {
$status->fatal( 'mergehistory-fail-invalid-dest' );
}
// Make sure page aren't the same
if ( $this->source->equals( $this->dest ) ) {
$status->fatal( 'mergehistory-fail-self-merge' );
}
// Make sure the timestamp is valid
if ( !$this->timestampLimit ) {
$status->fatal( 'mergehistory-fail-bad-timestamp' );
}
// $this->timestampLimit must be older than $this->maxTimestamp
if ( $this->timestampLimit > $this->maxTimestamp ) {
$status->fatal( 'mergehistory-fail-timestamps-overlap' );
}
// Check that there are not too many revisions to move
if ( $this->timestampLimit && $this->getRevisionCount() > self::REVISION_LIMIT ) {
$status->fatal( 'mergehistory-fail-toobig', Message::numParam( self::REVISION_LIMIT ) );
}
return $status;
}
/**
* Actually attempt the history move
*
* @todo if all versions of page A are moved to B and then a user
* tries to do a reverse-merge via the "unmerge" log link, then page
* A will still be a redirect (as it was after the original merge),
* though it will have the old revisions back from before (as expected).
* The user may have to "undo" the redirect manually to finish the "unmerge".
* Maybe this should delete redirects at the source page of merges?
*
* @param User $user
* @param string $reason
* @return Status status of the history merge
*/
public function merge( User $user, $reason = '' ) {
$status = new Status();
// Check validity and permissions required for merge
$validCheck = $this->isValidMerge(); // Check this first to check for null pages
if ( !$validCheck->isOK() ) {
return $validCheck;
}
$permCheck = $this->checkPermissions( $user, $reason );
if ( !$permCheck->isOK() ) {
return $permCheck;
}
$this->dbw->update(
'revision',
[ 'rev_page' => $this->dest->getArticleID() ],
[ 'rev_page' => $this->source->getArticleID(), $this->timeWhere ],
__METHOD__
);
// Check if this did anything
$this->revisionsMerged = $this->dbw->affectedRows();
if ( $this->revisionsMerged < 1 ) {
$status->fatal( 'mergehistory-fail-no-change' );
return $status;
}
// Make the source page a redirect if no revisions are left
$haveRevisions = $this->dbw->selectField(
'revision',
'rev_timestamp',
[ 'rev_page' => $this->source->getArticleID() ],
__METHOD__,
[ 'FOR UPDATE' ]
);
if ( !$haveRevisions ) {
if ( $reason ) {
$reason = wfMessage(
'mergehistory-comment',
$this->source->getPrefixedText(),
$this->dest->getPrefixedText(),
$reason
)->inContentLanguage()->text();
} else {
$reason = wfMessage(
'mergehistory-autocomment',
$this->source->getPrefixedText(),
$this->dest->getPrefixedText()
)->inContentLanguage()->text();
}
$contentHandler = ContentHandler::getForTitle( $this->source );
$redirectContent = $contentHandler->makeRedirectContent(
$this->dest,
wfMessage( 'mergehistory-redirect-text' )->inContentLanguage()->plain()
);
if ( $redirectContent ) {
$redirectPage = WikiPage::factory( $this->source );
$redirectRevision = new Revision( [
'title' => $this->source,
'page' => $this->source->getArticleID(),
'comment' => $reason,
'content' => $redirectContent ] );
$redirectRevision->insertOn( $this->dbw );
$redirectPage->updateRevisionOn( $this->dbw, $redirectRevision );
// Now, we record the link from the redirect to the new title.
// It should have no other outgoing links...
$this->dbw->delete(
'pagelinks',
[ 'pl_from' => $this->dest->getArticleID() ],
__METHOD__
);
$this->dbw->insert( 'pagelinks',
[
'pl_from' => $this->dest->getArticleID(),
'pl_from_namespace' => $this->dest->getNamespace(),
'pl_namespace' => $this->dest->getNamespace(),
'pl_title' => $this->dest->getDBkey() ],
__METHOD__
);
} else {
// Warning if we couldn't create the redirect
$status->warning( 'mergehistory-warning-redirect-not-created' );
}
} else {
$this->source->invalidateCache(); // update histories
}
$this->dest->invalidateCache(); // update histories
// Update our logs
$logEntry = new ManualLogEntry( 'merge', 'merge' );
$logEntry->setPerformer( $user );
$logEntry->setComment( $reason );
$logEntry->setTarget( $this->source );
$logEntry->setParameters( [
'4::dest' => $this->dest->getPrefixedText(),
'5::mergepoint' => $this->timestampLimit->getTimestamp( TS_MW )
] );
$logId = $logEntry->insert();
$logEntry->publish( $logId );
Hooks::run( 'ArticleMergeComplete', [ $this->source, $this->dest ] );
return $status;
}
}