Java: introducing websocket support.

src/java/nginx/unit/websocket/AuthenticatorFactory.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 nginx.unit.websocket;
+
+import java.util.Iterator;
+import java.util.ServiceLoader;
+
+/**
+ * Utility method to return the appropriate authenticator according to
+ * the scheme that the server uses.
+ */
+public class AuthenticatorFactory {
+
+    /**
+     * Return a new authenticator instance.
+     * @param authScheme The scheme used
+     * @return the authenticator
+     */
+    public static Authenticator getAuthenticator(String authScheme) {
+
+        Authenticator auth = null;
+        switch (authScheme.toLowerCase()) {
+
+        case BasicAuthenticator.schemeName:
+            auth = new BasicAuthenticator();
+            break;
+
+        case DigestAuthenticator.schemeName:
+            auth = new DigestAuthenticator();
+            break;
+
+        default:
+            auth = loadAuthenticators(authScheme);
+            break;
+        }
+
+        return auth;
+
+    }
+
+    private static Authenticator loadAuthenticators(String authScheme) {
+        ServiceLoader<Authenticator> serviceLoader = ServiceLoader.load(Authenticator.class);
+        Iterator<Authenticator> auths = serviceLoader.iterator();
+
+        while (auths.hasNext()) {
+            Authenticator auth = auths.next();
+            if (auth.getSchemeName().equalsIgnoreCase(authScheme))
+                return auth;
+        }
+
+        return null;
+    }
+
+}