Author: scottbw
Date: Tue Mar 4 13:10:32 2014
New Revision: 1574086
URL: http://svn.apache.org/r1574086
Log:
Created a cache for expired single-use tokens. See WOOKIE-426.
Added:
wookie/trunk/wookie-server/src/main/java/org/apache/wookie/auth/ExpiredSingleUseTokenCache.java
Added:
wookie/trunk/wookie-server/src/main/java/org/apache/wookie/auth/ExpiredSingleUseTokenCache.java
URL:
http://svn.apache.org/viewvc/wookie/trunk/wookie-server/src/main/java/org/apache/wookie/auth/ExpiredSingleUseTokenCache.java?rev=1574086&view=auto
==============================================================================
---
wookie/trunk/wookie-server/src/main/java/org/apache/wookie/auth/ExpiredSingleUseTokenCache.java
(added)
+++
wookie/trunk/wookie-server/src/main/java/org/apache/wookie/auth/ExpiredSingleUseTokenCache.java
Tue Mar 4 13:10:32 2014
@@ -0,0 +1,90 @@
+/*
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.wookie.auth;
+
+import java.util.LinkedList;
+
+/**
+ *
+ * A cache of already-used single use tokens.
+ * Single use tokens have a short lifespan, so the cache
+ * doesn't have to be huge.
+ *
+ */
+public class ExpiredSingleUseTokenCache {
+
+ /**
+ * The singleton instance
+ */
+ private static ExpiredSingleUseTokenCache instance;
+
+ /**
+ * The cache, a simple linked list
+ */
+ private LinkedList<String> cache;
+
+ /**
+ * Private constructor
+ */
+ private ExpiredSingleUseTokenCache(){
+ cache = new LinkedList<String>();
+ }
+
+ /**
+ * The number of tokens to hold in the cache
+ */
+ private static final int CACHE_SIZE = 500;
+
+ /**
+ * Get the single instance
+ * @return the instance
+ */
+ public static ExpiredSingleUseTokenCache getInstance(){
+ if (instance == null){
+ instance = new ExpiredSingleUseTokenCache();
+ }
+ return instance;
+ }
+
+ /**
+ * Add a used token to the cache
+ * @param token
+ */
+ public void addToken(String token){
+ //
+ // add it to the end of the cache
+ //
+ cache.addLast(token);
+
+ //
+ // If the cache has grown to its max size, pop
+ // off the first nonce
+ //
+ if (cache.size() > CACHE_SIZE) cache.removeFirst();
+ }
+
+ /**
+ * Checks whether the token has been used.
+ * @param token the token to test
+ * @return true if the token is still valid, false if it has been used
already
+ */
+ public boolean isValid(String token){
+ if (cache.contains(token)) return false;
+ return true;
+ }
+
+}
