[ELY-2615] Add a test class that tests creating and making use of a custom NameRewriter

tests/base/src/test/java/org/wildfly/security/auth/server/CustomNameRewriterTest.java

@@ -0,0 +1,92 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2023 Red Hat, Inc., and individual contributors
+ * as indicated by the @author tags.
+ *
+ * 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.wildfly.security.auth.server;
+
+import org.junit.Test;
+import org.wildfly.security.auth.permission.LoginPermission;
+import org.wildfly.security.auth.realm.FileSystemSecurityRealm;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class CustomNameRewriterTest {
+
+    private static final String BEFORE_USER_NAME = "Bob";
+    private static final String AFTER_USER_NAME = "Robert";
+
+    @Test
+    public void testCustomNameRewriter() {
+        CustomNameRewriter rewriter = new CustomNameRewriter();
+        String adjustedName = rewriter.rewriteName(BEFORE_USER_NAME);
+        assertEquals(AFTER_USER_NAME, adjustedName);
+    }
+
+    @Test
+    public void testCustomNameRewriterAuthentication() throws Exception {
+        FileSystemSecurityRealm fileSystemSecurityRealm = createSecurityRealm();
+        CustomNameRewriter rewriter = new CustomNameRewriter();
+        SecurityDomain domainWithRewriter = SecurityDomain.builder().setDefaultRealmName("default").addRealm("default", fileSystemSecurityRealm).build()
+                .setPermissionMapper(((permissionMappable, roles) -> LoginPermission.getInstance()))
+                .setPreRealmRewriter(rewriter)
+                .build();
+        ServerAuthenticationContext sac1 = domainWithRewriter.createNewAuthenticationContext();
+        sac1.setAuthenticationName(BEFORE_USER_NAME); // security domain contains the user "Robert"
+        assertTrue(sac1.authorize());
+
+        SecurityDomain domainWithoutRewriter = SecurityDomain.builder().setDefaultRealmName("default").addRealm("default", fileSystemSecurityRealm).build()
+                .setPermissionMapper(((permissionMappable, roles) -> LoginPermission.getInstance()))
+                .build();
+        ServerAuthenticationContext sac2 = domainWithoutRewriter.createNewAuthenticationContext();
+        sac2.setAuthenticationName(BEFORE_USER_NAME); // should fail if rewriter not configured
+        assertFalse(sac2.authorize());
+    }
+
+    @Test
+    public void testCustomNameRewriterNonExistingUser() throws Exception{
+        FileSystemSecurityRealm fileSystemSecurityRealm = createSecurityRealm();
+        CustomNameRewriter rewriter = new CustomNameRewriter();
+        SecurityDomain securityDomain = SecurityDomain.builder().setDefaultRealmName("default").addRealm("default", fileSystemSecurityRealm).build()
+                .setPermissionMapper(((permissionMappable, roles) -> LoginPermission.getInstance()))
+                .setPreRealmRewriter(rewriter)
+                .build();
+        ServerAuthenticationContext sac = securityDomain.createNewAuthenticationContext();
+        sac.setAuthenticationName("John");
+        assertFalse(sac.authorize());
+    }
+
+    private FileSystemSecurityRealm createSecurityRealm() throws Exception {
+        FileSystemSecurityRealm realm = new FileSystemSecurityRealm(ServerUtils.getRootPath(true, getClass()));
+        ServerUtils.addUser(realm, AFTER_USER_NAME);
+        return realm;
+    }
+
+    private final class CustomNameRewriter implements NameRewriter {
+
+        @Override
+        public String rewriteName(String original) {
+            if (original == null) {
+                return null;
+            } else if (original.equals(BEFORE_USER_NAME)) {
+                return AFTER_USER_NAME;
+            } else {
+                return original;
+            }
+        }
+    }
+}