AC-10815 - API Input validation

Author: sreenia806

app/design/adminhtml/Magento/backend/i18n/en_US.csv

@@ -547,3 +547,4 @@ Dashboard,Dashboard
 "Web Section","Web Section"
 "Store Email Addresses Section","Store Email Addresses Section"
 "Email to a Friend","Email to a Friend"
+"Invalid data type","Invalid data type"

app/design/frontend/Magento/blank/i18n/en_US.csv

@@ -439,3 +439,4 @@ Summary,Summary
 Test,Test
 test,test
 Two,Two
+"Invalid data type","Invalid data type"

app/design/frontend/Magento/luma/i18n/en_US.csv

@@ -489,3 +489,4 @@ Remove,Remove
 Test,Test
 test,test
 Two,Two
+"Invalid data type","Invalid data type"

lib/internal/Magento/Framework/Webapi/ServiceInputProcessor.php

@@ -280,7 +280,9 @@ protected function _createFromArray($className, $data)
         $className = (string) $className;
         if (is_subclass_of($className, \SimpleXMLElement::class)
             || is_subclass_of($className, \DOMElement::class)) {
-            return null;
+            throw new SerializationException(
+                new Phrase('Invalid data type.')
+            );
         }
         $class = new ClassReflection($className);
         if (is_subclass_of($className, self::EXTENSION_ATTRIBUTES_TYPE)) {