Source Code : Security Example

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Security Example

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/



///////////////////////////////////////////////////////////////////////////////////////
class UserInfo {
    private String userName;

    private String password;

    public UserInfo(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }
    
    public String getPassword() {
        return password;
    }
    public String getUserName() {
        return userName;
    }
}

///////////////////////////////////////////////////////////////////////////////////////
public class SecureBean {

    public void writeSecureMessage() {
        System.out.println("Every time I learn something new, "
                + "it pushes some old stuff out my brain");
    }
}

///////////////////////////////////////////////////////////////////////////////////////

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class SecurityAdvice implements MethodBeforeAdvice {

    private SecurityManager securityManager;

    public SecurityAdvice() {
        this.securityManager = new SecurityManager();
    }

    public void before(Method method, Object[] args, Object target)
            throws Throwable {
        UserInfo user = securityManager.getLoggedOnUser();

        if (user == null) {
            System.out.println("No user authenticated");
            throw new SecurityException(
                    "You must login before attempting to invoke the method: "
                            + method.getName());
        } else if ("robh".equals(user.getUserName())) {
            System.out.println("Logged in user is robh - OKAY!");
        } else {
            System.out.println("Logged in user is " + user.getUserName()
                    + " NOT GOOD :(");
            throw new SecurityException("User " + user.getUserName()
                    + " is not allowed access to method " + method.getName());
        }

    }
}

///////////////////////////////////////////////////////////////////////////////////////
public class SecurityManager {

    private static ThreadLocal threadLocal = new ThreadLocal();

    public void login(String userName, String password) {
        // assumes that all credentials
        // are valid for a login
        threadLocal.set(new UserInfo(userName, password));
    }

    public void logout() {
        threadLocal.set(null);
        int x = 0;
    }

    public UserInfo getLoggedOnUser() {
        return (UserInfo) threadLocal.get();
    }
}

///////////////////////////////////////////////////////////////////////////////////////


import org.springframework.aop.framework.ProxyFactory;

public class SecurityExample {

    public static void main(String[] args) {
        // get the security manager
        SecurityManager mgr = new SecurityManager();
        
        // get the bean
        SecureBean bean = getSecureBean();

        // try as robh
        mgr.login("robh", "pwd");
        bean.writeSecureMessage();
        mgr.logout();
        
        // try as janm
        try {
            mgr.login("janm", "pwd");
            bean.writeSecureMessage();
        } catch(SecurityException ex) {
            System.out.println("Exception Caught: " + ex.getMessage());
        } finally {
            mgr.logout();
        }
        
        // try with no credentials
        try {
            bean.writeSecureMessage();
        } catch(SecurityException ex) {
            System.out.println("Exception Caught: " + ex.getMessage());
        }

    }
    
    private static SecureBean getSecureBean() {
        // create the target
        SecureBean target = new SecureBean();

        // create the advice
        SecurityAdvice advice = new SecurityAdvice();
        
        // get the proxy
        ProxyFactory factory = new ProxyFactory();
        factory.setTarget(target);
        factory.addAdvice(advice);
        SecureBean proxy = (SecureBean)factory.getProxy();
        
        return proxy;
        
    }
}

           
       

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