Create a function that checks if a username is a temporary user in JS

Bug: T327888
Change-Id: I45c888251676e7e84fef2eccf0e33b29d46c12e1

resources/Resources.php

@@ -1190,6 +1190,7 @@ return [
 				MainConfigNames::FragmentMode,
 				MainConfigNames::GenerateThumbnailOnParse,
 				MainConfigNames::LoadScript,
+				MainConfigNames::AutoCreateTempUser,
 			] ],
 			[ 'name' => 'portletLinkOptions.json', 'callback' => [ Skin::class, 'getPortletLinkOptions' ] ],
 		],

resources/src/mediawiki.util/util.js

@@ -1009,6 +1009,39 @@ util = {
 			ip = ip.toLowerCase();
 		}
 		return ip;
+	},
+
+	/**
+	 * This functionality has been adapted from MediaWiki\User\TempUser\Pattern::isMatch()
+	 *
+	 * Checks if the pattern matches the given username
+	 *
+	 * @param {string} username
+	 * @return {boolean}
+	 */
+	isTemporaryUser: function ( username ) {
+		var autoCreateUserMatchPattern = config.AutoCreateTempUser.matchPattern;
+		var position = autoCreateUserMatchPattern.indexOf( '$1' );
+
+		if ( !config.AutoCreateTempUser.enabled ) {
+			return false;
+		}
+		// '$1' was not found in autoCreateUserMatchPattern
+		if ( position === -1 ) {
+			return false;
+		}
+		var prefix = autoCreateUserMatchPattern.slice( 0, position );
+		var suffix = autoCreateUserMatchPattern.slice( position + '$1'.length );
+
+		var match = true;
+		if ( prefix !== '' ) {
+			match = ( username.indexOf( prefix ) === 0 );
+		}
+		if ( match && suffix !== '' ) {
+			match = ( username.indexOf( suffix, username.length - suffix.length ) !== -1 ) &&
+				( username.length >= prefix.length + suffix.length );
+		}
+		return match;
 	}
 };
 

tests/qunit/resources/mediawiki.util/util.test.js

@@ -852,4 +852,25 @@
 		} );
 
 	} );
+
+	QUnit.test( 'isTemporaryUser', function ( assert ) {
+		var usernames = [
+			[ '*$1', 'Test', false, true, 'prefix mismatch' ],
+			[ '*$1', '*Some user', true, true, 'prefix match' ],
+			[ '$1*', 'Some user*', true, true, 'suffix only match' ],
+			[ '$1*', 'Some user', false, true, 'suffix only mismatch' ],
+			[ '*$1*', '*Unregistered 123*', true, true, 'prefix and suffix match' ],
+			[ '*$1*', 'Unregistered 123*', false, true, 'prefix and suffix mismatch' ],
+			[ '*$1*', '**', true, true, 'prefix and suffix zero length match' ],
+			[ '*$1*', '*', false, true, 'prefix and suffix overlapping' ],
+			[ '*$1*', '*', false, false, 'Auto create temporary user disabled' ]
+		];
+		usernames.forEach( function ( username ) {
+			mw.util.setOptionsForTest( {
+				AutoCreateTempUser: { enabled: username[ 3 ], matchPattern: username[ 0 ] }
+			} );
+
+			assert.strictEqual( util.isTemporaryUser( username[ 1 ] ), username[ 2 ], username[ 4 ] );
+		} );
+	} );
 }() );