public static HandshakeBuilder translateHandshakeHttp(ByteBuffer buf, Role role)
throws InvalidHandshakeException, IncompleteHandshakeException {
HandshakeBuilder handshake;
String line = readStringLine(buf);
if (line == null) throw new IncompleteHandshakeException(buf.capacity() + 128);
String[] firstLineTokens = line.split(" ", 3); // eg. HTTP/1.1 101 Switching the Protocols
if (firstLineTokens.length != 3) {
throw new InvalidHandshakeException();
}
if (role == Role.CLIENT) {
// translating/parsing the response from the SERVER
handshake = new HandshakeImpl1Server();
ServerHandshakeBuilder serverhandshake = (ServerHandshakeBuilder) handshake;
serverhandshake.setHttpStatus(Short.parseShort(firstLineTokens[1]));
serverhandshake.setHttpStatusMessage(firstLineTokens[2]);
} else {
// translating/parsing the request from the CLIENT
ClientHandshakeBuilder clienthandshake = new HandshakeImpl1Client();
clienthandshake.setResourceDescriptor(firstLineTokens[1]);
handshake = clienthandshake;
}
line = readStringLine(buf);
while (line != null && line.length() > 0) {
String[] pair = line.split(":", 2);
if (pair.length != 2) throw new InvalidHandshakeException("not an http header");
handshake.put(pair[0], pair[1].replaceFirst("^ +", ""));
line = readStringLine(buf);
}
if (line == null) throw new IncompleteHandshakeException();
return handshake;
}
@Override
public ClientHandshakeBuilder postProcessHandshakeRequestAsClient(
ClientHandshakeBuilder request) {
request.put("Upgrade", "websocket");
request.put("Connection", "Upgrade"); // to respond to a Connection keep alives
request.put("Sec-WebSocket-Version", "8");
byte[] random = new byte[16];
reuseableRandom.nextBytes(random);
request.put("Sec-WebSocket-Key", Base64.encodeBytes(random));
return request;
}