Validate no more than one http trigger given (#1474)

pkg/platform/abstract/platform.go

@@ -220,14 +220,22 @@ func (ap *Platform) ValidateCreateFunctionOptions(createFunctionOptions *platfor
 		return errors.New("Project doesn't exist")
 	}
 
-	// Verify _trigger's MaxWorkers value is making sense
+	// Verify trigger's MaxWorkers value is making sense, and that there's no more than one http trigger
+	var httpTriggerExists bool
 	for triggerName, _trigger := range createFunctionOptions.FunctionConfig.Spec.Triggers {
 		if _trigger.MaxWorkers > trigger.MaxWorkersLimit {
 			return errors.Errorf("MaxWorkers value for %s trigger (%d) exceeds the limit of %d",
 				triggerName,
 				_trigger.MaxWorkers,
 				trigger.MaxWorkersLimit)
 		}
+		if _trigger.Kind == "http" {
+			if !httpTriggerExists {
+				httpTriggerExists = true
+				continue
+			}
+			return errors.New("There's more than one http trigger (unsupported)")
+		}
 	}
 
 	return nil