OpenID / Cleaning up cached tokens (geonetwork#7810)

* always remove all expired tokens

* cleanup imports

* added unit test

* added copyright preamble

core/src/main/java/org/fao/geonet/kernel/security/openidconnect/bearer/UserInfoCache.java

@@ -10,19 +10,13 @@
  */
 public class UserInfoCache {
 
-    static Object lockobj = new Object();
+    static final Object lockobj = new Object();
     Map<String, UserInfoCacheItem> cache = new HashMap<>();
 
     public UserInfoCacheItem getItem(String accessKey) {
         synchronized (lockobj) {
-            if (!cache.containsKey(accessKey))
-                return null;
-            UserInfoCacheItem item = cache.get(accessKey);
-            if (item.isExpired()) {
-                cache.remove(accessKey);
-                return null;
-            }
-            return item;
+            cache.entrySet().removeIf(e -> e.getValue().isExpired());
+            return cache.get(accessKey);
         }
     }
 

core/src/test/java/org/fao/geonet/kernel/security/openidconnect/bearer/UserInfoCacheTest.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2022 Food and Agriculture Organization of the
+ * United Nations (FAO-UN), United Nations World Food Programme (WFP)
+ * and United Nations Environment Programme (UNEP)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
+ * Rome - Italy. email: [email protected]
+ */
+package org.fao.geonet.kernel.security.openidconnect.bearer;
+
+import com.google.common.collect.Lists;
+import junit.framework.TestCase;
+import org.springframework.security.oauth2.core.user.DefaultOAuth2User;
+import org.springframework.security.oauth2.core.user.OAuth2User;
+
+import java.time.Instant;
+import java.util.Collections;
+
+public class UserInfoCacheTest extends TestCase {
+
+    private OAuth2User user1 = new DefaultOAuth2User(Lists.newArrayList(), Collections.singletonMap("name", "frank"), "name");
+    private OAuth2User user2 = new DefaultOAuth2User(Lists.newArrayList(), Collections.singletonMap("name", "jeff"), "name");
+
+    public void testCache() {
+        UserInfoCacheItem item1 = new UserInfoCacheItem("a", Instant.now().plusSeconds(1000), user1, Lists.newArrayList());
+        UserInfoCacheItem item2 = new UserInfoCacheItem("b", Instant.now().plusSeconds(1000), user2, Lists.newArrayList());
+        UserInfoCacheItem item3 = new UserInfoCacheItem("c", Instant.now().minusSeconds(1000), user2, Lists.newArrayList());
+
+        UserInfoCache cache = new UserInfoCache();
+        cache.putItem(item1);
+        cache.putItem(item2);
+        cache.putItem(item3);
+
+        assertEquals(3, cache.cache.size());
+        assertEquals(item1, cache.getItem("a"));
+        assertEquals(item2, cache.getItem("b"));
+        assertNull(cache.getItem("c"));
+        assertEquals(2, cache.cache.size());
+    }
+}