e4995be33c
Motivation: In many places Netty uses Unpooled.buffer(0) while should use EMPTY_BUFFER. We can't change this due to back compatibility in the constructors but can use Unpooled.EMPTY_BUFFER in some cases to ensure we not allocate at all. In others we can directly use the allocator either from the Channel / ChannelHandlerContext or the request / response. Modification: - Use Unpooled.EMPTY_BUFFER where possible - Use allocator where possible Result: Fixes #9345 for websockets and http package
112 lines
3.6 KiB
Java
112 lines
3.6 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx;
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import io.netty.util.concurrent.FastThreadLocal;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Base64;
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import java.util.concurrent.ThreadLocalRandom;
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/**
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* A utility class mainly for use by web sockets
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*/
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final class WebSocketUtil {
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private static final FastThreadLocal<MessageDigest> MD5 = new FastThreadLocal<MessageDigest>() {
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@Override
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protected MessageDigest initialValue() throws Exception {
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try {
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//Try to get a MessageDigest that uses MD5
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return MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException e) {
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//This shouldn't happen! How old is the computer?
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throw new InternalError("MD5 not supported on this platform - Outdated?");
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}
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}
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};
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private static final FastThreadLocal<MessageDigest> SHA1 = new FastThreadLocal<MessageDigest>() {
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@Override
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protected MessageDigest initialValue() throws Exception {
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try {
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//Try to get a MessageDigest that uses SHA1
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return MessageDigest.getInstance("SHA1");
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} catch (NoSuchAlgorithmException e) {
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//This shouldn't happen! How old is the computer?
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throw new InternalError("SHA-1 not supported on this platform - Outdated?");
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}
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}
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};
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/**
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* Performs a MD5 hash on the specified data
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*
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* @param data The data to hash
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* @return The hashed data
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*/
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static byte[] md5(byte[] data) {
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// TODO(normanmaurer): Create md5 method that not need MessageDigest.
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return digest(MD5, data);
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}
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/**
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* Performs a SHA-1 hash on the specified data
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*
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* @param data The data to hash
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* @return The hashed data
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*/
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static byte[] sha1(byte[] data) {
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// TODO(normanmaurer): Create sha1 method that not need MessageDigest.
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return digest(SHA1, data);
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}
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private static byte[] digest(FastThreadLocal<MessageDigest> digestFastThreadLocal, byte[] data) {
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MessageDigest digest = digestFastThreadLocal.get();
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digest.reset();
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return digest.digest(data);
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}
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/**
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* Performs base64 encoding on the specified data
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*
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* @param data The data to encode
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* @return An encoded string containing the data
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*/
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static String base64(byte[] data) {
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return Base64.getEncoder().encodeToString(data);
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}
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/**
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* Creates an arbitrary number of random bytes
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*
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* @param size the number of random bytes to create
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* @return An array of random bytes
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*/
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static byte[] randomBytes(int size) {
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byte[] bytes = new byte[size];
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ThreadLocalRandom.current().nextBytes(bytes);
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return bytes;
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}
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/**
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* A private constructor to ensure that instances of this class cannot be made
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*/
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private WebSocketUtil() {
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// Unused
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}
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}
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