Ref #30071: make groups upper-cased

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/auth/impl/SimpleAuthenticationBackend.java

@@ -79,14 +79,15 @@ private SimpleUser loadUser(int index) {
 		// method 1: single property with comma seperated groups
 		String[] groups = environment.getProperty(String.format("proxy.users[%d].groups", index), String[].class);
 		if (groups != null) {
+			groups = Arrays.stream(groups).map(String::toUpperCase).toArray(String[]::new);
 			return new SimpleUser(userName, password, groups);
 		} else {
 			// method 2: YAML array
 			List<String> groupsList = new ArrayList<>();
 			int groupIndex = 0;
 			String group = environment.getProperty(String.format("proxy.users[%d].groups[%d]", index, groupIndex));
 			while (group != null) {
-				groupsList.add(group);
+				groupsList.add(group.toUpperCase());
 				groupIndex++;
 				group = environment.getProperty(String.format("proxy.users[%d].groups[%d]", index, groupIndex));
 			}