import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

import org.apache.log4j.Logger;
import org.apache.oro.text.regex.MalformedPatternException;

import com.jcraft.jsch.ChannelShell;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UserInfo;


 
import expect4j.Closure;
import expect4j.Expect4j;
import expect4j.ExpectState;
import expect4j.matches.EofMatch;
import expect4j.matches.Match;
import expect4j.matches.RegExpMatch;
import expect4j.matches.TimeoutMatch;

publicclass Shell {

    privatestatic Logger log = Logger.getLogger(Shell.class
 
);
    
    private Session session;
    private ChannelShell channel;
    privatestatic Expect4j expect =null;
    privatestaticfinallong defaultTimeOut =1000;
    private StringBuffer buffer=new StringBuffer();
    
    publicstaticfinalint COMMAND_EXECUTION_SUCCESS_OPCODE =-2;
    publicstaticfinal String BACKSLASH_R 
 
="\r";
    publicstaticfinal String BACKSLASH_N ="\n";
    publicstaticfinal String COLON_CHAR =":";
    publicstatic String ENTER_CHARACTER = BACKSLASH_R;
    publicstaticfinalint SSH_PORT =22;
    
    //正則匹配，用於處理伺服器返回的結果publicstatic String[] linuxPromptRegEx =new String[] { "~]#", "~#", "#",
            ":~#", "/$", ">" };
    
    publicstatic String[] errorMsg=new String[]{"could not acquire the config lock "};
    
    //ssh伺服器的ip地址private String ip;
    //ssh伺服器的登入埠privateint port;
    //ssh伺服器的登入使用者名稱private String user;
    //ssh伺服器的登入密碼private String password;
    
    public Shell(String ip,int port,String user,String password) {
        this.ip=ip;
        this.port=port;
        this.user=user;
        this.password=password;
        expect = getExpect();
    }
    
    /**
     * 關閉SSH遠端連線
     */publicvoid disconnect(){
        if(channel!=null){
            channel.disconnect();
        }
        if(session!=null){
            session.disconnect();
        }
    }
    
    /**
     * 獲取伺服器返回的資訊
     * @return 服務端的執行結果
     */public String getResponse(){
        return buffer.toString();
    }
    
    //獲得Expect4j物件，該對用可以往SSH傳送命令請求private Expect4j getExpect() {
        try {
            log.debug(String.format("Start logging to %[email protected]%s:%s",user,ip,port));
            JSch jsch =new JSch();
            session = jsch.getSession(user, ip, port);
            session.setPassword(password);
            Hashtable<String, String> config =new Hashtable<String, String>();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            localUserInfo ui =new localUserInfo();
            session.setUserInfo(ui);
            session.connect();
            channel = (ChannelShell) session.openChannel("shell");
            Expect4j expect =new Expect4j(channel.getInputStream(), channel
                    .getOutputStream());
            channel.connect();
            log.debug(String.format("Logging to %[email protected]%s:%s successfully!",user,ip,port));
            return expect;
        } catch (Exception ex) {
            log.error("Connect to "+ip+":"+port+"failed,please check your username and password!");
            ex.printStackTrace();
        }
        returnnull;
    }

    /**
     * 執行配置命令
     * @param commands 要執行的命令，為字元陣列
     * @return 執行是否成功
     */publicboolean executeCommands(String[] commands) {
        //如果expect返回為0，說明登入沒有成功if(expect==null){
            returnfalse;
        }
        
        log.debug("----------Running commands are listed as follows:----------");
        for(String command:commands){
            log.debug(command);
        }
        log.debug("----------End----------");
        
        Closure closure =new Closure() {
            publicvoid run(ExpectState expectState) throws Exception {
                buffer.append(expectState.getBuffer());// buffer is string
                                                        // buffer for appending
                                                        // output of executed
                                                        // command                expectState.exp_continue();
                
            }
        };
        List<Match> lstPattern =new ArrayList<Match>();
        String[] regEx = linuxPromptRegEx;
        if (regEx !=null&& regEx.length >0) {
            synchronized (regEx) {
                for (String regexElement : regEx) {// list of regx like, :>, />
                                                    // etc. it is possible
                                                    // command prompts of your
                                                    // remote machinetry {
                        RegExpMatch mat =new RegExpMatch(regexElement, closure);
                        lstPattern.add(mat);
                    } catch (MalformedPatternException e) {
                        returnfalse;
                    } catch (Exception e) {
                        returnfalse;
                    }
                }
                lstPattern.add(new EofMatch(new Closure() { // should cause
                                                            // entire page to be
                                                            // collectedpublicvoid run(ExpectState state) {
                            }
                        }));
                lstPattern.add(new TimeoutMatch(defaultTimeOut, new Closure() {
                    publicvoid run(ExpectState state) {
                    }
                }));
            }
        }
        try {
            boolean isSuccess =true;
            for (String strCmd : commands){
                isSuccess = isSuccess(lstPattern, strCmd);
            }
            //防止最後一個命令執行不了            isSuccess =!checkResult(expect.expect(lstPattern));
            
            //找不到錯誤資訊標示成功            String response=buffer.toString().toLowerCase();
            for(String msg:errorMsg){
                if(response.indexOf(msg)>-1){
                    returnfalse;
                }
            }
            
            return isSuccess;
        } catch (Exception ex) {
            ex.printStackTrace();
            returnfalse;
        }
    }

    //檢查執行是否成功privateboolean isSuccess(List<Match> objPattern, String strCommandPattern) {
        try {
            boolean isFailed = checkResult(expect.expect(objPattern));
            if (!isFailed) {
                expect.send(strCommandPattern);
                expect.send("\r");
                returntrue;
            }
            returnfalse;
        } catch (MalformedPatternException ex) {
            returnfalse;
        } catch (Exception ex) {
            returnfalse;
        }
    }

    //檢查執行返回的狀態privateboolean checkResult(int intRetVal) {
        if (intRetVal == COMMAND_EXECUTION_SUCCESS_OPCODE) {
            returntrue;
        }
        returnfalse;
    }
    
    //登入SSH時的控制資訊
    //設定不提示輸入密碼、不顯示登入資訊等publicstaticclass localUserInfo implements UserInfo {
        String passwd;

        public String getPassword() {
            return passwd;
        }

        publicboolean promptYesNo(String str) {
            returntrue;
        }

        public String getPassphrase() {
            returnnull;
        }

        publicboolean promptPassphrase(String message) {
            returntrue;
        }

        publicboolean promptPassword(String message) {
            returntrue;
        }

        publicvoid showMessage(String message) {
            
        }
    }

}