made user codes case insensitive

Author: jricher

openid-connect-server/src/main/java/org/mitre/oauth2/service/impl/DefaultDeviceCodeService.java

@@ -57,8 +57,8 @@ public DeviceCode createNewDeviceCode(Set<String> requestedScopes, ClientDetails
 // create a device code, should be big and random
 String deviceCode = UUID.randomUUID().toString();
 
-// create a user code, should be random but small and typable
-String userCode = randomGenerator.generate();
+// create a user code, should be random but small and typable, and always uppercase (lookup is case insensitive)
+String userCode = randomGenerator.generate().toUpperCase();
 
 DeviceCode dc = new DeviceCode(deviceCode, userCode, requestedScopes, client.getClientId(), parameters);
 
@@ -76,7 +76,8 @@ public DeviceCode createNewDeviceCode(Set<String> requestedScopes, ClientDetails
  */
 @Override
 public DeviceCode lookUpByUserCode(String userCode) {
-return repository.getByUserCode(userCode);
+// always up-case the code for lookup
+return repository.getByUserCode(userCode.toUpperCase());
 }
 
 /* (non-Javadoc)