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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.http.websocketx.extensions;
17  
18  
19  /**
20   * Handshakes a client extension with the server.
21   */
22  public interface WebSocketClientExtensionHandshaker {
23  
24      /**
25       * Return extension configuration to submit to the server.
26       *
27       * @return the desired extension configuration.
28       */
29      WebSocketExtensionData newRequestData();
30  
31      /**
32       * Handshake based on server response. It should always succeed because server response
33       * should be a request acknowledge.
34       *
35       * @param extensionData
36       *          the extension configuration sent by the server.
37       * @return an initialized extension if handshake phase succeed or null if failed.
38       */
39      WebSocketClientExtension handshakeExtension(WebSocketExtensionData extensionData);
40  
41  }