fix: correctly resolve lambda function name from Arguments or Parameters

Author: edvaldoszy

lib/deploy/stepFunctions/compileIamRole.js

@@ -362,7 +362,7 @@ function getRedshiftDataPermissions(action, state) {
 function getLambdaPermissions(state) {
   // function name can be name-only, name-only with alias, full arn or partial arn
   // https://docs.aws.amazon.com/lambda/latest/dg/API_Invoke.html#API_Invoke_RequestParameters
-  const functionName = state.Parameters.FunctionName;
+  const functionName = getParameterOrArgument(state, 'FunctionName');
   if (_.isString(functionName)) {
     const segments = functionName.split(':');
 
@@ -429,10 +429,11 @@ function getLambdaPermissions(state) {
     }];
   }
 
-  if (state.Parameters['FunctionName.$']) {
+  if (getParameterOrArgument(state, 'FunctionName.$')) {
+    const allowedFunctions = getParameterOrArgument(state, 'AllowedFunctions');
     return [{
       action: 'lambda:InvokeFunction',
-      resource: state.Parameters.AllowedFunctions ? state.Parameters.AllowedFunctions : '*',
+      resource: allowedFunctions || '*',
     }];
   }