Add new core tags

Add tags to types of edits that get automatic edit summaries:
- Making a page a redirect
- Changing redirect target
- Changing an existing redirect into a non-redirect
- Blanking of the page
- Removing nearly all (more than 90%) content
- Rolling back an edit

Bug: T167656
Bug: T73236
Change-Id: Ie7f637fcec5ee659c1086e28e8ba21f470c45160

includes/DefaultSettings.php

@@ -6961,6 +6961,29 @@ $wgAllowCategorizedRecentChanges = false;
  */
 $wgUseTagFilter = true;
 
+/**
+ * List of core tags to enable. Available tags are:
+ * - 'mw-contentmodelchange': Edit changes content model of a page
+ * - 'mw-new-redirect': Edit makes new redirect page (new page or by changing content page)
+ * - 'mw-removed-redirect': Edit changes an existing redirect into a non-redirect
+ * - 'mw-changed-redirect-target': Edit changes redirect target
+ * - 'mw-blank': Edit completely blanks the page
+ * - 'mw-replace': Edit removes more than 90% of the content
+ * - 'mw-rollback': Edit is a rollback, made through the rollback link or rollback API
+ *
+ * @var array
+ * @since 1.31
+ */
+$wgSoftwareTags = [
+	'mw-contentmodelchange' => true,
+	'mw-new-redirect' => true,
+	'mw-removed-redirect' => true,
+	'mw-changed-redirect-target' => true,
+	'mw-blank' => true,
+	'mw-replace' => true,
+	'mw-rollback' => true
+];
+
 /**
  * If set to an integer, pages that are watched by this many users or more
  * will not require the unwatchedpages permission to view the number of

includes/changetags/ChangeTags.php

@@ -32,10 +32,44 @@ class ChangeTags {
 	 */
 	const MAX_DELETE_USES = 5000;
 
+	private static $definedSoftwareTags = [
+		'mw-contentmodelchange',
+		'mw-new-redirect',
+		'mw-removed-redirect',
+		'mw-changed-redirect-target',
+		'mw-blank',
+		'mw-replace',
+		'mw-rollback'
+	];
+
 	/**
-	 * @var string[]
+	 * Loads defined core tags, checks for invalid types (if not array),
+	 * and filters for supported and enabled (if $all is false) tags only.
+	 *
+	 * @param bool $all If true, return all valid defined tags. Otherwise, return only enabled ones.
+	 * @return array Array of all defined/enabled tags.
 	 */
-	private static $coreTags = [ 'mw-contentmodelchange' ];
+	public static function getSoftwareTags( $all = false ) {
+		global $wgSoftwareTags;
+		$softwareTags = [];
+
+		if ( !is_array( $wgSoftwareTags ) ) {
+			wfWarn( 'wgSoftwareTags should be associative array of enabled tags.
+			Please refer to documentation for the list of tags you can enable' );
+			return $softwareTags;
+		}
+
+		$availableSoftwareTags = !$all ?
+			array_keys( array_filter( $wgSoftwareTags ) ) :
+			array_keys( $wgSoftwareTags );
+
+		$softwareTags = array_intersect(
+			$availableSoftwareTags,
+			self::$definedSoftwareTags
+		);
+
+		return $softwareTags;
+	}
 
 	/**
 	 * Creates HTML for the given tags
@@ -1210,7 +1244,7 @@ class ChangeTags {
 	 */
 	public static function listSoftwareActivatedTags() {
 		// core active tags
-		$tags = self::$coreTags;
+		$tags = self::getSoftwareTags();
 		if ( !Hooks::isRegistered( 'ChangeTagsListActive' ) ) {
 			return $tags;
 		}
@@ -1301,7 +1335,7 @@ class ChangeTags {
 	 */
 	public static function listSoftwareDefinedTags() {
 		// core defined tags
-		$tags = self::$coreTags;
+		$tags = self::getSoftwareTags( true );
 		if ( !Hooks::isRegistered( 'ListDefinedTags' ) ) {
 			return $tags;
 		}

includes/content/ContentHandler.php

@@ -754,82 +754,190 @@ abstract class ContentHandler {
 		return false;
 	}
 
+	/**
+	 * Return type of change if one exists for the given edit.
+	 *
+	 * @since 1.31
+	 *
+	 * @param Content|null $oldContent The previous text of the page.
+	 * @param Content|null $newContent The submitted text of the page.
+	 * @param int $flags Bit mask: a bit mask of flags submitted for the edit.
+	 *
+	 * @return string|null String key representing type of change, or null.
+	 */
+	private function getChangeType(
+		Content $oldContent = null,
+		Content $newContent = null,
+		$flags = 0
+	) {
+		$oldTarget = $oldContent !== null ? $oldContent->getRedirectTarget() : null;
+		$newTarget = $newContent !== null ? $newContent->getRedirectTarget() : null;
+
+		// We check for the type of change in the given edit, and return string key accordingly
+
+		// Blanking of a page
+		if ( $oldContent && $oldContent->getSize() > 0 &&
+			$newContent && $newContent->getSize() === 0
+		) {
+			return 'blank';
+		}
+
+		// Redirects
+		if ( $newTarget ) {
+			if ( !$oldTarget ) {
+				// New redirect page (by creating new page or by changing content page)
+				return 'new-redirect';
+			} elseif ( !$newTarget->equals( $oldTarget ) ||
+				$oldTarget->getFragment() !== $newTarget->getFragment()
+			) {
+				// Redirect target changed
+				return 'changed-redirect-target';
+			}
+		} elseif ( $oldTarget ) {
+			// Changing an existing redirect into a non-redirect
+			return 'removed-redirect';
+		}
+
+		// New page created
+		if ( $flags & EDIT_NEW && $newContent && $newContent->getSize() > 0 ) {
+			return 'newpage';
+		}
+
+		// New blank page
+		if ( $flags & EDIT_NEW && $newContent && $newContent->getSize() === 0 ) {
+			return 'newblank';
+		}
+
+		// Removing more than 90% of the page
+		if ( $oldContent && $newContent && $oldContent->getSize() > 10 * $newContent->getSize() ) {
+			return 'replace';
+		}
+
+		// Content model changed
+		if ( $oldContent && $newContent && $oldContent->getModel() !== $newContent->getModel() ) {
+			return 'contentmodelchange';
+		}
+
+		return null;
+	}
+
 	/**
 	 * Return an applicable auto-summary if one exists for the given edit.
 	 *
 	 * @since 1.21
 	 *
-	 * @param Content $oldContent The previous text of the page.
-	 * @param Content $newContent The submitted text of the page.
+	 * @param Content|null $oldContent The previous text of the page.
+	 * @param Content|null $newContent The submitted text of the page.
 	 * @param int $flags Bit mask: a bit mask of flags submitted for the edit.
 	 *
 	 * @return string An appropriate auto-summary, or an empty string.
 	 */
-	public function getAutosummary( Content $oldContent = null, Content $newContent = null,
-		$flags ) {
+	public function getAutosummary(
+		Content $oldContent = null,
+		Content $newContent = null,
+		$flags = 0
+	) {
+		$changeType = $this->getChangeType( $oldContent, $newContent, $flags );
+
+		// There's no applicable auto-summary for our case, so our auto-summary is empty.
+		if ( !$changeType ) {
+			return '';
+		}
+
 		// Decide what kind of auto-summary is needed.
-
-		// Redirect auto-summaries
-
-		/**
-		 * @var $ot Title
-		 * @var $rt Title
-		 */
-
-		$ot = !is_null( $oldContent ) ? $oldContent->getRedirectTarget() : null;
-		$rt = !is_null( $newContent ) ? $newContent->getRedirectTarget() : null;
-
-		if ( is_object( $rt ) ) {
-			if ( !is_object( $ot )
-				|| !$rt->equals( $ot )
-				|| $ot->getFragment() != $rt->getFragment()
-			) {
+		switch ( $changeType ) {
+			case 'new-redirect':
+				$newTarget = $newContent->getRedirectTarget();
 				$truncatedtext = $newContent->getTextForSummary(
 					250
 					- strlen( wfMessage( 'autoredircomment' )->inContentLanguage()->text() )
-					- strlen( $rt->getFullText() ) );
+					- strlen( $newTarget->getFullText() )
+				);
 
-				return wfMessage( 'autoredircomment', $rt->getFullText() )
+				return wfMessage( 'autoredircomment', $newTarget->getFullText() )
 					->rawParams( $truncatedtext )->inContentLanguage()->text();
-			}
+			case 'changed-redirect-target':
+				$oldTarget = $oldContent->getRedirectTarget();
+				$newTarget = $newContent->getRedirectTarget();
+
+				$truncatedtext = $newContent->getTextForSummary(
+					250
+					- strlen( wfMessage( 'autosumm-changed-redirect-target' )
+						->inContentLanguage()->text() )
+					- strlen( $oldTarget->getFullText() )
+					- strlen( $newTarget->getFullText() )
+				);
+
+				return wfMessage( 'autosumm-changed-redirect-target',
+						$oldTarget->getFullText(),
+						$newTarget->getFullText() )
+					->rawParams( $truncatedtext )->inContentLanguage()->text();
+			case 'removed-redirect':
+				$oldTarget = $oldContent->getRedirectTarget();
+				$truncatedtext = $newContent->getTextForSummary(
+					250
+					- strlen( wfMessage( 'autosumm-removed-redirect' )
+						->inContentLanguage()->text() )
+					- strlen( $oldTarget->getFullText() ) );
+
+				return wfMessage( 'autosumm-removed-redirect', $oldTarget->getFullText() )
+					->rawParams( $truncatedtext )->inContentLanguage()->text();
+			case 'newpage':
+				// If they're making a new article, give its text, truncated, in the summary.
+				$truncatedtext = $newContent->getTextForSummary(
+					200 - strlen( wfMessage( 'autosumm-new' )->inContentLanguage()->text() ) );
+
+				return wfMessage( 'autosumm-new' )->rawParams( $truncatedtext )
+					->inContentLanguage()->text();
+			case 'blank':
+				return wfMessage( 'autosumm-blank' )->inContentLanguage()->text();
+			case 'replace':
+				$truncatedtext = $newContent->getTextForSummary(
+					200 - strlen( wfMessage( 'autosumm-replace' )->inContentLanguage()->text() ) );
+
+				return wfMessage( 'autosumm-replace' )->rawParams( $truncatedtext )
+					->inContentLanguage()->text();
+			case 'newblank':
+				return wfMessage( 'autosumm-newblank' )->inContentLanguage()->text();
+			default:
+				return '';
+		}
+	}
+
+	/**
+	 * Return an applicable tag if one exists for the given edit or return null.
+	 *
+	 * @since 1.31
+	 *
+	 * @param Content|null $oldContent The previous text of the page.
+	 * @param Content|null $newContent The submitted text of the page.
+	 * @param int $flags Bit mask: a bit mask of flags submitted for the edit.
+	 *
+	 * @return string|null An appropriate tag, or null.
+	 */
+	public function getChangeTag(
+		Content $oldContent = null,
+		Content $newContent = null,
+		$flags = 0
+	) {
+		$changeType = $this->getChangeType( $oldContent, $newContent, $flags );
+
+		// There's no applicable tag for this change.
+		if ( !$changeType ) {
+			return null;
 		}
 
-		// New page auto-summaries
-		if ( $flags & EDIT_NEW && $newContent->getSize() > 0 ) {
-			// If they're making a new article, give its text, truncated, in
-			// the summary.
+		// Core tags use the same keys as ones returned from $this->getChangeType()
+		// but prefixed with pseudo namespace 'mw-', so we add the prefix before checking
+		// if this type of change should be tagged
+		$tag = 'mw-' . $changeType;
 
-			$truncatedtext = $newContent->getTextForSummary(
-				200 - strlen( wfMessage( 'autosumm-new' )->inContentLanguage()->text() ) );
-
-			return wfMessage( 'autosumm-new' )->rawParams( $truncatedtext )
-				->inContentLanguage()->text();
+		// Not all change types are tagged, so we check against the list of defined tags.
+		if ( in_array( $tag, ChangeTags::getSoftwareTags() ) ) {
+			return $tag;
 		}
 
-		// Blanking auto-summaries
-		if ( !empty( $oldContent ) && $oldContent->getSize() > 0 && $newContent->getSize() == 0 ) {
-			return wfMessage( 'autosumm-blank' )->inContentLanguage()->text();
-		} elseif ( !empty( $oldContent )
-			&& $oldContent->getSize() > 10 * $newContent->getSize()
-			&& $newContent->getSize() < 500
-		) {
-			// Removing more than 90% of the article
-
-			$truncatedtext = $newContent->getTextForSummary(
-				200 - strlen( wfMessage( 'autosumm-replace' )->inContentLanguage()->text() ) );
-
-			return wfMessage( 'autosumm-replace' )->rawParams( $truncatedtext )
-				->inContentLanguage()->text();
-		}
-
-		// New blank article auto-summary
-		if ( $flags & EDIT_NEW && $newContent->isEmpty() ) {
-			return wfMessage( 'autosumm-newblank' )->inContentLanguage()->text();
-		}
-
-		// If we reach this point, there's no applicable auto-summary for our
-		// case, so our auto-summary is empty.
-		return '';
+		return null;
 	}
 
 	/**

includes/page/WikiPage.php

@@ -1617,13 +1617,15 @@ class WikiPage implements Page, IDBAccessObject {
 		$old_revision = $this->getRevision(); // current revision
 		$old_content = $this->getContent( Revision::RAW ); // current revision's content
 
-		if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
-			$tags[] = 'mw-contentmodelchange';
+		$handler = $content->getContentHandler();
+		$tag = $handler->getChangeTag( $old_content, $content, $flags );
+		// If there is no applicable tag, null is returned, so we need to check
+		if ( $tag ) {
+			$tags[] = $tag;
 		}
 
-		// Provide autosummaries if one is not provided and autosummaries are enabled
+		// Provide autosummaries if summary is not provided and autosummaries are enabled
 		if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
-			$handler = $content->getContentHandler();
 			$summary = $handler->getAutosummary( $old_content, $content, $flags );
 		}
 
@@ -3211,6 +3213,10 @@ class WikiPage implements Page, IDBAccessObject {
 		$targetContent = $target->getContent();
 		$changingContentModel = $targetContent->getModel() !== $current->getContentModel();
 
+		if ( in_array( 'mw-rollback', ChangeTags::getSoftwareTags() ) ) {
+			$tags[] = 'mw-rollback';
+		}
+
 		// Actually store the edit
 		$status = $this->doEditContent(
 			$targetContent,
@@ -3287,7 +3293,8 @@ class WikiPage implements Page, IDBAccessObject {
 			'summary' => $summary,
 			'current' => $current,
 			'target' => $target,
-			'newid' => $revId
+			'newid' => $revId,
+			'tags' => $tags
 		];
 
 		return [];

languages/i18n/en.json

@@ -3641,6 +3641,8 @@
 	"autosumm-blank": "Blanked the page",
 	"autosumm-replace": "Replaced content with \"$1\"",
 	"autoredircomment": "Redirected page to [[$1]]",
+	"autosumm-removed-redirect": "Removed redirect to [[$1]]",
+	"autosumm-changed-redirect-target": "Changed redirect target from [[$1]] to [[$2]]",
 	"autosumm-new": "Created page with \"$1\"",
 	"autosumm-newblank": "Created blank page",
 	"autoblock_whitelist": "",
@@ -3866,6 +3868,18 @@
 	"tag-list-wrapper": "([[Special:Tags|{{PLURAL:$1|Tag|Tags}}]]: $2)",
 	"tag-mw-contentmodelchange": "content model change",
 	"tag-mw-contentmodelchange-description": "Edits that [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:ChangeContentModel change the content model] of a page",
+	"tag-mw-new-redirect": "New redirect",
+	"tag-mw-new-redirect-description": "Edits that create a new redirect or change a page to a redirect",
+	"tag-mw-removed-redirect": "Removed redirect",
+	"tag-mw-removed-redirect-description": "Edits that change an existing redirect to a non-redirect",
+	"tag-mw-changed-redirect-target": "Redirect target changed",
+	"tag-mw-changed-redirect-target-description": "Edits that change the target of a redirect",
+	"tag-mw-blank": "Blanking",
+	"tag-mw-blank-description": "Edits that blank a page",
+	"tag-mw-replace": "Replaced",
+	"tag-mw-replace-description": "Edits that remove more than 90% of the content of a page",
+	"tag-mw-rollback": "Rollback",
+	"tag-mw-rollback-description": "Edits that roll back previous edits using the rollback link",
 	"tags-title": "Tags",
 	"tags-intro": "This page lists the tags that the software may mark an edit with, and their meaning.",
 	"tags-tag": "Tag name",

languages/i18n/qqq.json

@@ -3835,6 +3835,8 @@
 	"autosumm-blank": "The auto summary when blanking the whole page. This is not the same as deleting the page.",
 	"autosumm-replace": "The auto summary when a user removes a lot of characters in the page.\n\nParameters:\n* $1 - truncated text",
 	"autoredircomment": "The auto summary when making a redirect. Parameters:\n* $1 - the page where it redirects to\n* $2 - (Optional) the first X number of characters of the redirect ($2 is usually only used when end users customize the message)\n{{Identical|Redirect}}",
+	"autosumm-removed-redirect": "The auto summary when making a redirect. Parameters:\n* $1 - the page where it redirects to\n* $2 - (Optional) the first X number of characters of the redirect ($2 is usually only used when end users customize the message)\n{{Identical|Redirect}}",
+	"autosumm-changed-redirect-target": "The auto summary when making a redirect. Parameters:\n* $1 - the page where it redirects to\n* $2 - (Optional) the first X number of characters of the redirect ($2 is usually only used when end users customize the message)\n{{Identical|Redirect}}",
 	"autosumm-new": "The auto summary when creating a new page. $1 are the first X number of characters of the new page.",
 	"autosumm-newblank": "The automatic edit summary when creating a blank page. This is not the same as blanking a page.",
 	"autoblock_whitelist": "{{notranslate}}",
@@ -4060,6 +4062,18 @@
 	"tag-list-wrapper": "Wrapper for the list of tags shown on recent changes, watchlists, history pages and diffs.\n\nParameters:\n* $1 - number of distinct tags for given edit\n* $2 - comma-separated list of tags for given edit",
 	"tag-mw-contentmodelchange": "Change tag for edits that change the content model of a page",
 	"tag-mw-contentmodelchange-description": "Description for \"content model change\" change tag",
+	"tag-mw-new-redirect": "Change tag for edits that make the page a redirect (either redirect creation or editing an existing page)",
+	"tag-mw-new-redirect-description": "Description for \"New redirect\" change tag",
+	"tag-mw-removed-redirect": "Change tag for edits that change an existing redirect into a non-redirect",
+	"tag-mw-removed-redirect-description": "Description for \"Removed redirect\" change tag",
+	"tag-mw-changed-redirect-target": "Change tag for edits that change the target of a redirect",
+	"tag-mw-changed-redirect-target-description": "Description for \"Redirect target changed\" change tag",
+	"tag-mw-blank": "Change tag for edits that blank a page with existing content",
+	"tag-mw-blank-description": "Description for \"blank\" change tag",
+	"tag-mw-replace": "Change tag for edits removing more than 90% of the content of a page",
+	"tag-mw-replace-description": "Description for \"replace\" change tag",
+	"tag-mw-rollback": "Change tag for rolling back an edit",
+	"tag-mw-rollback-description": "Description for \"rollback\" change tag",
 	"tags-title": "The title of [[Special:Tags]].\n{{Identical|Tag}}",
 	"tags-intro": "Explanation on top of [[Special:Tags]]. For more information on tags see [[mw:Manual:Tags|MediaWiki]].",
 	"tags-tag": "Caption of a column in [[Special:Tags]]. For more information on tags see [[mw:Manual:Tags|MediaWiki]].",

tests/phpunit/includes/changetags/ChangeTagsTest.php

@@ -5,7 +5,7 @@
  */
 class ChangeTagsTest extends MediaWikiTestCase {
 
-	// TODO only modifyDisplayQuery is tested, nothing else is
+	// TODO only modifyDisplayQuery and getSoftwareTags are tested, nothing else is
 
 	/** @dataProvider provideModifyDisplayQuery */
 	public function testModifyDisplayQuery( $origQuery, $filter_tag, $useTags, $modifiedQuery ) {
@@ -244,4 +244,66 @@ class ChangeTagsTest extends MediaWikiTestCase {
 		];
 	}
 
+	public static function dataGetSoftwareTags() {
+		return [
+			[
+				[
+					'mw-contentModelChange' => true,
+					'mw-redirect' => true,
+					'mw-rollback' => true,
+					'mw-blank' => true,
+					'mw-replace' => true
+				],
+				[
+					'mw-rollback',
+					'mw-replace',
+					'mw-blank'
+				]
+			],
+
+			[
+				[
+					'mw-contentmodelchanged' => true,
+					'mw-replace' => true,
+					'mw-new-redirects' => true,
+					'mw-changed-redirect-target' => true,
+					'mw-rolback' => true,
+					'mw-blanking' => false
+				],
+				[
+					'mw-replace',
+					'mw-changed-redirect-target'
+				]
+			],
+
+			[
+				[
+					null,
+					false,
+					'Lorem ipsum',
+					'mw-translation'
+				],
+				[]
+			],
+
+			[
+				[],
+				[]
+			]
+		];
+	}
+
+	/**
+	 * @dataProvider dataGetSoftwareTags
+	 * @covers ChangeTags::getSoftwareTags
+	 */
+	public function testGetSoftwareTags( $softwareTags, $expected ) {
+		$this->setMwGlobals( 'wgSoftwareTags', $softwareTags );
+
+		$actual = ChangeTags::getSoftwareTags();
+		// Order of tags in arrays is not important
+		sort( $expected );
+		sort( $actual );
+		$this->assertEquals( $expected, $actual );
+	}
 }

tests/phpunit/includes/content/ContentHandlerTest.php

@@ -342,15 +342,32 @@ class ContentHandlerTest extends MediaWikiTestCase {
 		$content = new DummyContentHandlerForTesting( CONTENT_MODEL_WIKITEXT );
 		$title = Title::newFromText( 'Help:Test' );
 		// Create a new content object with no content
-		$newContent = ContentHandler::makeContent( '', $title, null, null, CONTENT_MODEL_WIKITEXT );
+		$newContent = ContentHandler::makeContent( '', $title, CONTENT_MODEL_WIKITEXT, null );
 		// first check, if we become a blank page created summary with the right bitmask
 		$autoSummary = $content->getAutosummary( null, $newContent, 97 );
-		$this->assertEquals( $autoSummary, 'Created blank page' );
+		$this->assertEquals( $autoSummary,
+			wfMessage( 'autosumm-newblank' )->inContentLanguage()->text() );
 		// now check, what we become with another bitmask
 		$autoSummary = $content->getAutosummary( null, $newContent, 92 );
 		$this->assertEquals( $autoSummary, '' );
 	}
 
+	/**
+	 * Test software tag that is added when content model of the page changes
+	 * @covers ContentHandler::getChangeTag
+	 */
+	public function testGetChangeTag() {
+		$this->setMwGlobals( 'wgSoftwareTags', [ 'mw-contentmodelchange' => true ] );
+		$wikitextContentHandler = new DummyContentHandlerForTesting( CONTENT_MODEL_WIKITEXT );
+		// Create old content object with javascript content model
+		$oldContent = ContentHandler::makeContent( '', null, CONTENT_MODEL_JAVASCRIPT, null );
+		// Create new content object with wikitext content model
+		$newContent = ContentHandler::makeContent( '', null, CONTENT_MODEL_WIKITEXT, null );
+		// Get the tag for this edit
+		$tag = $wikitextContentHandler->getChangeTag( $oldContent, $newContent, EDIT_UPDATE );
+		$this->assertSame( $tag, 'mw-contentmodelchange' );
+	}
+
 	/*
 	public function testSupportsSections() {
 		$this->markTestIncomplete( "not yet implemented" );

tests/phpunit/includes/content/WikitextContentHandlerTest.php

@@ -185,6 +185,13 @@ class WikitextContentHandlerTest extends MediaWikiLangTestCase {
 				'/^Created page .*Hello/'
 			],
 
+			[
+				null,
+				'',
+				EDIT_NEW,
+				'/^Created blank page$/'
+			],
+
 			[
 				'Hello there, world!',
 				'',
@@ -227,6 +234,104 @@ class WikitextContentHandlerTest extends MediaWikiLangTestCase {
 		);
 	}
 
+	public static function dataGetChangeTag() {
+		return [
+			[
+				null,
+				'#REDIRECT [[Foo]]',
+				0,
+				'mw-new-redirect'
+			],
+
+			[
+				'Lorem ipsum dolor',
+				'#REDIRECT [[Foo]]',
+				0,
+				'mw-new-redirect'
+			],
+
+			[
+				'#REDIRECT [[Foo]]',
+				'Lorem ipsum dolor',
+				0,
+				'mw-removed-redirect'
+			],
+
+			[
+				'#REDIRECT [[Foo]]',
+				'#REDIRECT [[Bar]]',
+				0,
+				'mw-changed-redirect-target'
+			],
+
+			[
+				null,
+				'Lorem ipsum dolor',
+				EDIT_NEW,
+				null // mw-newpage is not defined as a tag
+			],
+
+			[
+				null,
+				'',
+				EDIT_NEW,
+				null // mw-newblank is not defined as a tag
+			],
+
+			[
+				'Lorem ipsum dolor',
+				'',
+				0,
+				'mw-blank'
+			],
+
+			[
+				'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy
+				eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam
+				voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet
+				clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.',
+				'Ipsum',
+				0,
+				'mw-replace'
+			],
+
+			[
+				'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy
+				eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam
+				voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet
+				clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.',
+				'Duis purus odio, rhoncus et finibus dapibus, facilisis ac urna. Pellentesque
+				arcu, tristique nec tempus nec, suscipit vel arcu. Sed non dolor nec ligula
+				congue tempor. Quisque pellentesque finibus orci a molestie. Nam maximus, purus
+				euismod finibus mollis, dui ante malesuada felis, dignissim rutrum diam sapien.',
+				0,
+				null
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider dataGetChangeTag
+	 * @covers WikitextContentHandler::getChangeTag
+	 */
+	public function testGetChangeTag( $old, $new, $flags, $expected ) {
+		$this->setMwGlobals( 'wgSoftwareTags', [
+			'mw-new-redirect' => true,
+			'mw-removed-redirect' => true,
+			'mw-changed-redirect-target' => true,
+			'mw-newpage' => true,
+			'mw-newblank' => true,
+			'mw-blank' => true,
+			'mw-replace' => true,
+		] );
+		$oldContent = is_null( $old ) ? null : new WikitextContent( $old );
+		$newContent = is_null( $new ) ? null : new WikitextContent( $new );
+
+		$tag = $this->handler->getChangeTag( $oldContent, $newContent, $flags );
+
+		$this->assertSame( $expected, $tag );
+	}
+
 	/**
 	 * @todo Text case requires database, should be done by a test class in the Database group
 	 */

tests/phpunit/includes/page/WikiPageTest.php

@@ -993,6 +993,60 @@ more stuff
 		$this->assertEquals( "one", $page->getContent()->getNativeData() );
 	}
 
+	/**
+	 * Tests tagging for edits that do rollback action
+	 * @covers WikiPage::doRollback
+	 */
+	public function testDoRollbackTagging() {
+		if ( !in_array( 'mw-rollback', ChangeTags::getSoftwareTags() ) ) {
+			$this->markTestSkipped( 'Rollback tag deactivated, skipped the test.' );
+		}
+
+		$admin = new User();
+		$admin->setName( 'Administrator' );
+		$admin->addToDatabase();
+
+		$text = 'First line';
+		$page = $this->newPage( 'WikiPageTest_testDoRollbackTagging' );
+		$page->doEditContent(
+			ContentHandler::makeContent( $text, $page->getTitle(), CONTENT_MODEL_WIKITEXT ),
+			'Added first line',
+			EDIT_NEW,
+			false,
+			$admin
+		);
+
+		$secondUser = new User();
+		$secondUser->setName( '92.65.217.32' );
+		$text .= '\n\nSecond line';
+		$page = new WikiPage( $page->getTitle() );
+		$page->doEditContent(
+			ContentHandler::makeContent( $text, $page->getTitle(), CONTENT_MODEL_WIKITEXT ),
+			'Adding second line',
+			0,
+			false,
+			$secondUser
+		);
+
+		// Now, try the rollback
+		$admin->addGroup( 'sysop' ); // Make the test user a sysop
+		$token = $admin->getEditToken( 'rollback' );
+		$errors = $page->doRollback(
+			$secondUser->getName(),
+			'testing rollback',
+			$token,
+			false,
+			$resultDetails,
+			$admin
+		);
+
+		// If doRollback completed without errors
+		if ( $errors === [] ) {
+			$tags = $resultDetails[ 'tags' ];
+			$this->assertContains( 'mw-rollback', $tags );
+		}
+	}
+
 	public static function provideGetAutoDeleteReason() {
 		return [
 			[