org.apache.james.protocols.netty.ProtocolMDCContext Maven / Gradle / Ivy

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package org.apache.james.protocols.netty;

import java.io.Closeable;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Optional;

import org.apache.james.protocols.api.Protocol;
import org.apache.james.protocols.api.ProtocolSession;
import org.apache.james.util.MDCBuilder;
import org.jboss.netty.channel.ChannelHandlerContext;

public class ProtocolMDCContext {
    public static Closeable from(Protocol protocol, ChannelHandlerContext ctx) {
        return MDCBuilder.create()
            .addContext(from(ctx.getAttachment()))
            .addContext(MDCBuilder.PROTOCOL, protocol.getName())
            .addContext(MDCBuilder.IP, retrieveIp(ctx))
            .addContext(MDCBuilder.HOST, retrieveHost(ctx))
            .build();
    }

    private static String retrieveIp(ChannelHandlerContext ctx) {
        SocketAddress remoteAddress = ctx.getChannel().getRemoteAddress();
        if (remoteAddress instanceof InetSocketAddress) {
            InetSocketAddress address = (InetSocketAddress) remoteAddress;
            return address.getAddress().getHostAddress();
        }
        return remoteAddress.toString();
    }

    private static String retrieveHost(ChannelHandlerContext ctx) {
        SocketAddress remoteAddress = ctx.getChannel().getRemoteAddress();
        if (remoteAddress instanceof InetSocketAddress) {
            InetSocketAddress address = (InetSocketAddress) remoteAddress;
            return address.getHostName();
        }
        return remoteAddress.toString();
    }

    private static MDCBuilder from(Object o) {
        return Optional.ofNullable(o)
            .filter(object -> object instanceof ProtocolSession)
            .map(object -> (ProtocolSession) object)
            .map(protocolSession -> MDCBuilder.create()
                .addContext(MDCBuilder.SESSION_ID, protocolSession.getSessionID())
                .addContext(MDCBuilder.CHARSET, protocolSession.getCharset().displayName())
                .addContext(MDCBuilder.USER, protocolSession.getUser()))
            .orElse(MDCBuilder.create());
    }

}