content: package com.alibaba.otter.canal.admin.handler;
  
  import java.util.concurrent.TimeUnit;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.channel.SimpleChannelHandler;
  import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler;
  import org.jboss.netty.handler.timeout.IdleStateEvent;
  import org.jboss.netty.handler.timeout.IdleStateHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.slf4j.helpers.MessageFormatter;
  
  import com.alibaba.otter.canal.admin.CanalAdmin;
  import com.alibaba.otter.canal.admin.netty.AdminNettyUtils;
  import com.alibaba.otter.canal.protocol.AdminPacket.ClientAuth;
  import com.alibaba.otter.canal.protocol.AdminPacket.Packet;
  import com.alibaba.otter.canal.server.netty.NettyUtils;
  
  /**
   * 客户端身份认证处理
   * 
   * @author agapple 2019年8月24日 下午10:58:53
   * @since 1.1.4
   */
  public class ClientAuthenticationHandler extends SimpleChannelHandler {
  
      private static final Logger logger                                  = LoggerFactory.getLogger(ClientAuthenticationHandler.class);
      private final int           SUPPORTED_VERSION                       = 3;
      private final int           defaultSubscriptorDisconnectIdleTimeout = 60 * 60 * 1000;
      private CanalAdmin          canalAdmin;
      private byte[]              seed;
  
      public ClientAuthenticationHandler(){
  
      }
  
      public ClientAuthenticationHandler(CanalAdmin canalAdmin){
          this.canalAdmin = canalAdmin;
      }
  
      public void messageReceived(final ChannelHandlerContext ctx, MessageEvent e) throws Exception {
          ChannelBuffer buffer = (ChannelBuffer) e.getMessage();
          final Packet packet = Packet.parseFrom(buffer.readBytes(buffer.readableBytes()).array());
          switch (packet.getVersion()) {
              case SUPPORTED_VERSION:
              default:
                  final ClientAuth clientAuth = ClientAuth.parseFrom(packet.getBody());
                  if (seed == null) {
                      byte[] errorBytes = AdminNettyUtils.errorPacket(300,
                          MessageFormatter.format("auth failed for seed is null", clientAuth.getUsername()).getMessage());
                      AdminNettyUtils.write(ctx.getChannel(), errorBytes);
                  }
  
                  if (!canalAdmin.auth(clientAuth.getUsername(), clientAuth.getPassword().toStringUtf8(), seed)) {
                      byte[] errorBytes = AdminNettyUtils.errorPacket(300,
                          MessageFormatter.format("auth failed for user:{}", clientAuth.getUsername()).getMessage());
                      AdminNettyUtils.write(ctx.getChannel(), errorBytes);
                  }
  
                  byte[] ackBytes = AdminNettyUtils.ackPacket();
                  AdminNettyUtils.write(ctx.getChannel(), ackBytes, future -> {
                      logger.info("remove unused channel handlers after authentication is done successfully.");
                      ctx.getPipeline().remove(HandshakeInitializationHandler.class.getName());
                      ctx.getPipeline().remove(ClientAuthenticationHandler.class.getName());
  
                      int readTimeout = defaultSubscriptorDisconnectIdleTimeout;
                      int writeTimeout = defaultSubscriptorDisconnectIdleTimeout;
                      if (clientAuth.getNetReadTimeout() > 0) {
                          readTimeout = clientAuth.getNetReadTimeout();
                      }
                      if (clientAuth.getNetWriteTimeout() > 0) {
                          writeTimeout = clientAuth.getNetWriteTimeout();
                      }
                      // fix bug: soTimeout parameter's unit from connector is
                      // millseconds.
                      IdleStateHandler idleStateHandler = new IdleStateHandler(NettyUtils.hashedWheelTimer,
                          readTimeout,
                          writeTimeout,
                          0,
                          TimeUnit.MILLISECONDS);
                      ctx.getPipeline().addBefore(SessionHandler.class.getName(),
                          IdleStateHandler.class.getName(),
                          idleStateHandler);
  
                      IdleStateAwareChannelHandler idleStateAwareChannelHandler = new IdleStateAwareChannelHandler() {
  
                          public void channelIdle(ChannelHandlerContext ctx1, IdleStateEvent e1) throws Exception {
                              logger.warn("channel:{} idle timeout exceeds, close channel to save server resources...",
                                  ctx1.getChannel());
                              ctx1.getChannel().close();
                          }
  
                      };
                      ctx.getPipeline().addBefore(SessionHandler.class.getName(),
                          IdleStateAwareChannelHandler.class.getName(),
                          idleStateAwareChannelHandler);
                  });
                  break;
          }
      }
  
      public void setCanalAdmin(CanalAdmin canalAdmin) {
          this.canalAdmin = canalAdmin;
      }
  
      public void setSeed(byte[] seed) {
          this.seed = seed;
      }
  
  }
  