added AD realm accepting user name only (by extending domain name automatically)

account/src/main/java/de/muehlencord/shared/account/util/UserNameActiveDirectoryRealm.java

@@ -0,0 +1,38 @@
+package de.muehlencord.shared.account.util;
+
+import javax.naming.NamingException;
+import javax.naming.ldap.LdapContext;
+import org.apache.shiro.authc.AuthenticationInfo;
+import org.apache.shiro.authc.AuthenticationToken;
+import org.apache.shiro.authc.UsernamePasswordToken;
+import org.apache.shiro.realm.activedirectory.ActiveDirectoryRealm;
+import org.apache.shiro.realm.ldap.LdapContextFactory;
+import org.apache.shiro.realm.ldap.LdapUtils;
+
+/**
+ *
+ * @author joern.muehlencord
+ */
+public class UserNameActiveDirectoryRealm extends ActiveDirectoryRealm {
+    
+    @Override
+    protected AuthenticationInfo queryForAuthenticationInfo(AuthenticationToken token, LdapContextFactory ldapContextFactory) throws NamingException {
+
+        UsernamePasswordToken upToken = (UsernamePasswordToken) token;
+        // Binds using the username and password provided by the user.
+        LdapContext ctx = null;
+        try {
+            String userName = upToken.getUsername();
+            if (principalSuffix != null) {
+                if (!userName.contains(principalSuffix))
+                    userName += principalSuffix;
+            }
+            
+            ctx = ldapContextFactory.getLdapContext(userName, String.valueOf(upToken.getPassword()));
+        } finally {
+            LdapUtils.closeContext(ctx);
+        }
+
+        return buildAuthenticationInfo(upToken.getUsername(), upToken.getPassword());
+    }
+}