From b6e6800c0d31d49e100533e14f6012b6161f1d8d Mon Sep 17 00:00:00 2001
From: Michael Jumper <mjumper@apache.org>
Date: Fri, 21 Jan 2022 15:23:41 -0800
Subject: [PATCH] GUACAMOLE-641: Consider null token mapping (blank YAML) to be
 empty.

---
 .../guacamole/vault/conf/VaultConfigurationService.java   | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/conf/VaultConfigurationService.java b/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/conf/VaultConfigurationService.java
index 25d1b9326..36a74ea4c 100644
--- a/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/conf/VaultConfigurationService.java
+++ b/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/conf/VaultConfigurationService.java
@@ -97,7 +97,13 @@ public abstract class VaultConfigurationService {
 
         // Deserialize token mapping from YAML
         try {
-            return mapper.readValue(confFile, new TypeReference<Map<String, String>>() {});
+
+            Map<String, String> mapping = mapper.readValue(confFile, new TypeReference<Map<String, String>>() {});
+            if (mapping == null)
+                return Collections.emptyMap();
+
+            return mapping;
+            
         }
 
         // Fail if YAML is invalid/unreadable