io.netty.handler.codec.http.websocketx.WebSocketUtil Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* Copyright 2012 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;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.base64.Base64;
import io.netty.util.CharsetUtil;
import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SuppressJava6Requirement;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* A utility class mainly for use by web sockets
*/
final class WebSocketUtil {
private static final FastThreadLocal MD5 = new FastThreadLocal() {
@Override
protected MessageDigest initialValue() throws Exception {
try {
//Try to get a MessageDigest that uses MD5
//Suppress a warning about weak hash algorithm
//since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
return MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
//This shouldn't happen! How old is the computer?
throw new InternalError("MD5 not supported on this platform - Outdated?");
}
}
};
private static final FastThreadLocal SHA1 = new FastThreadLocal() {
@Override
protected MessageDigest initialValue() throws Exception {
try {
//Try to get a MessageDigest that uses SHA1
//Suppress a warning about weak hash algorithm
//since it's defined in draft-ietf-hybi-thewebsocketprotocol-00
return MessageDigest.getInstance("SHA1");
} catch (NoSuchAlgorithmException e) {
//This shouldn't happen! How old is the computer?
throw new InternalError("SHA-1 not supported on this platform - Outdated?");
}
}
};
/**
* Performs a MD5 hash on the specified data
*
* @param data The data to hash
* @return The hashed data
*/
static byte[] md5(byte[] data) {
// TODO(normanmaurer): Create md5 method that not need MessageDigest.
return digest(MD5, data);
}
/**
* Performs a SHA-1 hash on the specified data
*
* @param data The data to hash
* @return The hashed data
*/
static byte[] sha1(byte[] data) {
// TODO(normanmaurer): Create sha1 method that not need MessageDigest.
return digest(SHA1, data);
}
private static byte[] digest(FastThreadLocal digestFastThreadLocal, byte[] data) {
MessageDigest digest = digestFastThreadLocal.get();
digest.reset();
return digest.digest(data);
}
/**
* Performs base64 encoding on the specified data
*
* @param data The data to encode
* @return An encoded string containing the data
*/
@SuppressJava6Requirement(reason = "Guarded with java version check")
static String base64(byte[] data) {
if (PlatformDependent.javaVersion() >= 8) {
return java.util.Base64.getEncoder().encodeToString(data);
}
String encodedString;
ByteBuf encodedData = Unpooled.wrappedBuffer(data);
try {
ByteBuf encoded = Base64.encode(encodedData);
try {
encodedString = encoded.toString(CharsetUtil.UTF_8);
} finally {
encoded.release();
}
} finally {
encodedData.release();
}
return encodedString;
}
/**
* Creates an arbitrary number of random bytes
*
* @param size the number of random bytes to create
* @return An array of random bytes
*/
static byte[] randomBytes(int size) {
byte[] bytes = new byte[size];
PlatformDependent.threadLocalRandom().nextBytes(bytes);
return bytes;
}
/**
* Generates a pseudo-random number
*
* @param minimum The minimum allowable value
* @param maximum The maximum allowable value
* @return A pseudo-random number
*/
static int randomNumber(int minimum, int maximum) {
assert minimum < maximum;
double fraction = PlatformDependent.threadLocalRandom().nextDouble();
// the idea here is that nextDouble gives us a random value
//
// 0 <= fraction <= 1
//
// the distance from min to max declared as
//
// dist = max - min
//
// satisfies the following
//
// min + dist = max
//
// taking into account
//
// 0 <= fraction * dist <= dist
//
// we've got
//
// min <= min + fraction * dist <= max
return (int) (minimum + fraction * (maximum - minimum));
}
static int byteAtIndex(int mask, int index) {
return (mask >> 8 * (3 - index)) & 0xFF;
}
/**
* A private constructor to ensure that instances of this class cannot be made
*/
private WebSocketUtil() {
// Unused
}
}