com.fireflysource.net.websocket.common.model.AcceptHash Maven / Gradle / Ivy
package com.fireflysource.net.websocket.common.model;
import com.fireflysource.common.codec.base64.Base64Utils;
import com.fireflysource.net.websocket.common.exception.EncodingAcceptHashKeyException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
/**
* Logic for working with the Sec-WebSocket-Key and Sec-WebSocket-Accept headers.
*
* This is kept separate from Connection objects to facilitate difference in behavior between client and server, as well as making testing easier.
*/
public class AcceptHash {
/**
* Globally Unique Identifier for use in WebSocket handshake within Sec-WebSocket-Accept and Sec-WebSocket-Key http headers.
*
* See Opening Handshake (Section 1.3)
*/
private final static byte[] MAGIC = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11".getBytes(StandardCharsets.ISO_8859_1);
/**
* Concatenate the provided key with the Magic GUID and return the Base64 encoded form.
*
* @param key the key to hash
* @return the Sec-WebSocket-Accept header response (per opening handshake spec)
*/
public static String hashKey(String key) {
try {
MessageDigest md = MessageDigest.getInstance("SHA1");
md.update(key.getBytes(StandardCharsets.UTF_8));
md.update(MAGIC);
return new String(Base64Utils.encode(md.digest()));
} catch (Exception e) {
throw new EncodingAcceptHashKeyException("", e);
}
}
}