PerMessageDeflateServerExtensionHandshaker.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.handler.codec.http.websocketx.extensions.compression;

import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionDecoder;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionEncoder;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionFilterProvider;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtension;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtensionHandshaker;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;

import static io.netty.util.internal.ObjectUtil.*;

/**
 * <a href="https://tools.ietf.org/html/draft-ietf-hybi-permessage-compression-18">permessage-deflate</a>
 * handshake implementation.
 */
public final class PerMessageDeflateServerExtensionHandshaker implements WebSocketServerExtensionHandshaker {

    public static final int MIN_WINDOW_SIZE = 8;
    public static final int MAX_WINDOW_SIZE = 15;

    static final String PERMESSAGE_DEFLATE_EXTENSION = "permessage-deflate";
    static final String CLIENT_MAX_WINDOW = "client_max_window_bits";
    static final String SERVER_MAX_WINDOW = "server_max_window_bits";
    static final String CLIENT_NO_CONTEXT = "client_no_context_takeover";
    static final String SERVER_NO_CONTEXT = "server_no_context_takeover";

    private final int compressionLevel;
    private final boolean allowServerWindowSize;
    private final int preferredClientWindowSize;
    private final boolean allowServerNoContext;
    private final boolean preferredClientNoContext;
    private final WebSocketExtensionFilterProvider extensionFilterProvider;
    private final int maxAllocation;

    /**
     * Constructor with default configuration.
     *
     * @deprecated
     *            Use {@link PerMessageDeflateServerExtensionHandshaker#
     *            PerMessageDeflateServerExtensionHandshaker(int)}.
// ... (258 more lines)