Return gracefully

Author: Chris Rehn

samtranslator/model/lambda_.py

@@ -52,7 +52,7 @@ class LambdaAlias(Resource):
         "ProvisionedConcurrencyConfig": PropertyType(False, is_type(dict)),
     }
 
-    runtime_attrs = {"arn": lambda self: fnGetAtt(self.logical_id, "Arn")}
+    runtime_attrs = {"arn": lambda self: ref(self.logical_id)}
 
 
 class LambdaEventSourceMapping(Resource):

samtranslator/open_api/open_api.py

@@ -101,7 +101,14 @@ def get_integration_function_logical_id(self, path_name, method_name):
 
         # Extract lambda integration (${LambdaName.Arn}) and split ".Arn" off from it
         regex = "([A-Za-z0-9]+\.Arn)"
-        match = re.findall(regex, arn)[0].split(".Arn")[0]
+        matches = re.findall(regex, arn)
+        # For Functions with AutoPublishAlias the integration URI will contain
+        # ${LambdaName}, not ${LambdaName.Arn} (both resolve to the AWS::Lambda::Alias ARN).
+        # Without the .Arn suffix, parsing the URI is more ambiguous, so instead of
+        # introducing more brittle hacks, return gracefully.
+        if not matches:
+            return False
+        match = matches[0].split(".Arn")[0]
         return match
 
     def method_has_integration(self, method):