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/*
 * Copyright (c) Microsoft. All rights reserved.
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */

package com.microsoft.azure.proton.transport.ws.impl;

import com.microsoft.azure.proton.transport.ws.WebSocketHeader;
import org.apache.qpid.proton.engine.impl.HandshakeSniffingTransportWrapper;
import org.apache.qpid.proton.engine.impl.TransportWrapper;

public class WebSocketSniffer extends HandshakeSniffingTransportWrapper {
    public WebSocketSniffer(TransportWrapper webSocket, TransportWrapper other) {
        super(webSocket, other);
    }

    protected TransportWrapper getSelectedTransportWrapper() {
        return _selectedTransportWrapper;
    }

    @Override
    protected int bufferSize() {
        return WebSocketHeader.MIN_HEADER_LENGTH_MASKED;
    }

    @Override
    protected void makeDetermination(byte[] bytes) {
        if (bytes.length < bufferSize()) {
            throw new IllegalArgumentException("insufficient bytes");
        }

        if (bytes[0] != WebSocketHeader.FINAL_OPCODE_BINARY) {
            _selectedTransportWrapper = _wrapper2;
            return;
        }

        _selectedTransportWrapper = _wrapper1;
    }
}