Decode variable value if it is an extension object

if we have an extension object which is still encoded
(e.g. from the nodeset compiler) we need to decode it
and set the decoded value instead of the encoded object

src/server/ua_nodes.c

@@ -3,6 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "ua_server_internal.h"
+#include "ua_types_encoding_binary.h"
 
 /* There is no UA_Node_new() method here. Creating nodes is part of the
  * NodeStore layer */
@@ -250,7 +251,39 @@ copyCommonVariableAttributes(UA_VariableNode *node,
 
     /* Copy the value */
     node->valueSource = UA_VALUESOURCE_DATA;
-    retval |= UA_Variant_copy(&attr->value, &node->value.data.value.value);
+	UA_NodeId extensionObject = UA_NODEID_NUMERIC(0, UA_NS0ID_STRUCTURE);
+	/* if we have an extension object which is still encoded (e.g. from the nodeset compiler)
+	 * we need to decode it and set the decoded value instead of the encoded object */
+	UA_Boolean valueSet = false;
+	if (attr->value.type != NULL && UA_NodeId_equal(&attr->value.type->typeId, &extensionObject)) {
+		const UA_ExtensionObject *obj = (const UA_ExtensionObject *)attr->value.data;
+		if (obj->encoding == UA_EXTENSIONOBJECT_ENCODED_BYTESTRING) {
+
+			const UA_DataType *type = UA_findDataTypeByBinary(&obj->content.encoded.typeId);
+
+			if (type) {
+				void *dst = UA_Array_new(attr->value.arrayLength, type);
+				uint8_t *tmpPos = (uint8_t *)dst;
+
+				for (size_t i=0; i<attr->value.arrayLength; i++) {
+					size_t offset =0;
+					const UA_ExtensionObject *curr = &((const UA_ExtensionObject *)attr->value.data)[i];
+					UA_StatusCode ret = UA_decodeBinary(&curr->content.encoded.body, &offset, tmpPos, type, 0, NULL);
+					if (ret != UA_STATUSCODE_GOOD) {
+						return ret;
+					}
+					tmpPos += type->memSize;
+				}
+
+				UA_Variant_setArray(&node->value.data.value.value, dst, attr->value.arrayLength, type);
+				valueSet = true;
+			}
+		}
+	}
+
+	if (!valueSet)
+		retval |= UA_Variant_copy(&attr->value, &node->value.data.value.value);
+
     node->value.data.value.hasValue = true;
 
     return retval;