Seperate code path for referenced authorizers permissions

Author: Aleksander Dikanski

lib/stackops/apiGateway.js

@@ -266,9 +266,12 @@ module.exports = function(currentTemplate, aliasStackTemplates, currentAliasStac
 			const functionName = _.replace(name, /LambdaPermissionApiGateway$/, '');
 			const versionName = _.find(_.keys(versions), version => _.startsWith(version, functionName));
 			const aliasName = _.find(_.keys(aliases), alias => _.startsWith(alias, functionName));
-
+			const isExternalRef = _.startsWith(permission.Properties.FunctionName, 'arn:aws:lambda'); 
+			
 			// Adjust references and alias permissions
-			permission.Properties.FunctionName = aliasName ? { Ref: aliasName } : permission.Properties.FunctionName;
+			if (!isExternalRef) {
+				permission.Properties.FunctionName = { Ref: aliasName };
+			}
 			if (permission.Properties.SourceArn) {
 				// Authorizers do not set the SourceArn property
 				permission.Properties.SourceArn = {
@@ -286,9 +289,13 @@ module.exports = function(currentTemplate, aliasStackTemplates, currentAliasStac
 					]
 				};
 			}
-
+			
 			// Add dependency on function version
-			permission.DependsOn = _.compact([ versionName, aliasName ]);
+			if (!isExternalRef) {	
+				permission.DependsOn = [ versionName, aliasName ];
+			} else {
+				permission.DependsOn = _.compact([ versionName, aliasName ]);
+			}
 
 			delete stageStack.Resources[name];
 		});