Merge "Drop SessionManager::autoCreateUser(), deprecated in 1.27 and unused"

[lhc/web/wiklou.git] / includes / api / ApiComparePages.php

diff --git a/includes/api/ApiComparePages.php b/includes/api/ApiComparePages.php
index f688346..4ba30ab 100644 (file)
--- a/includes/api/ApiComparePages.php
+++ b/includes/api/ApiComparePages.php
@@ -74,16 +74,48 @@ class ApiComparePages extends ApiBase {
                        switch ( $params['torelative'] ) {
                                case 'prev':
                                        // Swap 'from' and 'to'
-                                       list( $toRev, $toRelRev2, $toValsRev ) = [ $fromRev, $fromRelRev, $fromValsRev ];
-                                       $fromRev = $this->revisionStore->getPreviousRevision( $fromRelRev );
+                                       list( $toRev, $toRelRev, $toValsRev ) = [ $fromRev, $fromRelRev, $fromValsRev ];
+                                       $fromRev = $this->revisionStore->getPreviousRevision( $toRelRev );
                                        $fromRelRev = $fromRev;
                                        $fromValsRev = $fromRev;
+                                       if ( !$fromRev ) {
+                                               $title = Title::newFromLinkTarget( $toRelRev->getPageAsLinkTarget() );
+                                               $this->addWarning( [
+                                                       'apiwarn-compare-no-prev',
+                                                       wfEscapeWikiText( $title->getPrefixedText() ),
+                                                       $toRelRev->getId()
+                                               ] );
+
+                                               // (T203433) Create an empty dummy revision as the "previous".
+                                               // The main slot has to exist, the rest will be handled by DifferenceEngine.
+                                               $fromRev = $this->revisionStore->newMutableRevisionFromArray( [
+                                                       'title' => $title ?: Title::makeTitle( NS_SPECIAL, 'Badtitle/' . __METHOD__ )
+                                               ] );
+                                               $fromRev->setContent(
+                                                       SlotRecord::MAIN,
+                                                       $toRelRev->getContent( SlotRecord::MAIN, RevisionRecord::RAW )
+                                                               ->getContentHandler()
+                                                               ->makeEmptyContent()
+                                               );
+                                       }
                                        break;
 
                                case 'next':
                                        $toRev = $this->revisionStore->getNextRevision( $fromRelRev );
                                        $toRelRev = $toRev;
                                        $toValsRev = $toRev;
+                                       if ( !$toRev ) {
+                                               $title = Title::newFromLinkTarget( $fromRelRev->getPageAsLinkTarget() );
+                                               $this->addWarning( [
+                                                       'apiwarn-compare-no-next',
+                                                       wfEscapeWikiText( $title->getPrefixedText() ),
+                                                       $fromRelRev->getId()
+                                               ] );
+
+                                               // (T203433) The web UI treats "next" as "cur" in this case.
+                                               // Avoid repeating metadata by making a MutableRevisionRecord with no changes.
+                                               $toRev = MutableRevisionRecord::newFromParentRevision( $fromRelRev );
+                                       }
                                        break;
 
                                case 'cur':
@@ -103,10 +135,12 @@ class ApiComparePages extends ApiBase {
                        list( $toRev, $toRelRev, $toValsRev ) = $this->getDiffRevision( 'to', $params );
                }
 
-               // Handle missing from or to revisions
+               // Handle missing from or to revisions (should never happen)
+               // @codeCoverageIgnoreStart
                if ( !$fromRev || !$toRev ) {
                        $this->dieWithError( 'apierror-baddiff' );
                }
+               // @codeCoverageIgnoreEnd
 
                // Handle revdel
                if ( !$fromRev->audienceCan(