use parameter constants for extensions maps in token service

Author: jricher

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

@@ -16,6 +16,9 @@
  *******************************************************************************/
 package org.mitre.openid.connect.service.impl;
 
+import static org.mitre.openid.connect.request.ConnectRequestParameters.MAX_AGE;
+import static org.mitre.openid.connect.request.ConnectRequestParameters.NONCE;
+
 import java.util.Date;
 import java.util.Map;
 import java.util.Set;
@@ -58,7 +61,6 @@
 import com.nimbusds.jwt.JWTClaimsSet;
 import com.nimbusds.jwt.PlainJWT;
 import com.nimbusds.jwt.SignedJWT;
-
 /**
  * Default implementation of service to create specialty OpenID Connect tokens.
  * 
@@ -105,7 +107,7 @@ public OAuth2AccessTokenEntity createIdToken(ClientDetailsEntity client, OAuth2R
 JWTClaimsSet.Builder idClaims = new JWTClaimsSet.Builder();
 
 // if the auth time claim was explicitly requested OR if the client always wants the auth time, put it in
-if (request.getExtensions().containsKey("max_age")
+if (request.getExtensions().containsKey(MAX_AGE)
 || (request.getExtensions().containsKey("idtoken")) // TODO: parse the ID Token claims (#473) -- for now assume it could be in there
 || (client.getRequireAuthTime() != null && client.getRequireAuthTime())) {
 
@@ -134,7 +136,7 @@ public OAuth2AccessTokenEntity createIdToken(ClientDetailsEntity client, OAuth2R
 idClaims.audience(Lists.newArrayList(client.getClientId()));
 idClaims.jwtID(UUID.randomUUID().toString()); // set a random NONCE in the middle of it
 
-String nonce = (String)request.getExtensions().get("nonce");
+String nonce = (String)request.getExtensions().get(NONCE);
 if (!Strings.isNullOrEmpty(nonce)) {
 idClaims.claim("nonce", nonce);
 }