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java/org/apache/tomcat/websocket/server/DefaultServerEndpointConfigurator.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 org.apache.tomcat.websocket.server;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import javax.websocket.Extension;
+import javax.websocket.HandshakeResponse;
+import javax.websocket.server.HandshakeRequest;
+import javax.websocket.server.ServerEndpointConfig;
+
+public class DefaultServerEndpointConfigurator
+        extends ServerEndpointConfig.Configurator {
+
+    @Override
+    public <T> T getEndpointInstance(Class<T> clazz)
+            throws InstantiationException {
+        try {
+            return clazz.getConstructor().newInstance();
+        } catch (InstantiationException e) {
+            throw e;
+        } catch (ReflectiveOperationException e) {
+            InstantiationException ie = new InstantiationException();
+            ie.initCause(e);
+            throw ie;
+        }
+    }
+
+
+    @Override
+    public String getNegotiatedSubprotocol(List<String> supported,
+            List<String> requested) {
+
+        for (String request : requested) {
+            if (supported.contains(request)) {
+                return request;
+            }
+        }
+        return "";
+    }
+
+
+    @Override
+    public List<Extension> getNegotiatedExtensions(List<Extension> installed,
+            List<Extension> requested) {
+        Set<String> installedNames = new HashSet<>();
+        for (Extension e : installed) {
+            installedNames.add(e.getName());
+        }
+        List<Extension> result = new ArrayList<>();
+        for (Extension request : requested) {
+            if (installedNames.contains(request.getName())) {
+                result.add(request);
+            }
+        }
+        return result;
+    }
+
+
+    @Override
+    public boolean checkOrigin(String originHeaderValue) {
+        return true;
+    }
+
+    @Override
+    public void modifyHandshake(ServerEndpointConfig sec,
+            HandshakeRequest request, HandshakeResponse response) {
+        // NO-OP
+    }
+
+}