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Shiro的多Realm验证的实现--shiro实现不同身份使用不同Realm进行验证

如果要看多Realm进行授权:

请参看   https://blog.csdn.net/u013294097/article/details/90066869

假设现在有这样一种需求:存在两张表user和admin,分别记录普通用户和管理员的信息。并且现在要实现普通用户和管理员的分开登录,即需要两个Realm——UserRealm和AdminRealm,分别处理普通用户和管理员的验证功能。 
  但是正常情况下,当定义了两个Realm,无论是普通用户登录,还是管理员登录,都会由这两个Realm共同处理。这是因为,当配置了多个Realm时,我们通常使用的认证器是shiro自带的org.apache.shiro.authc.pam.ModularRealmAuthenticator,其中决定使用的Realm的是doAuthenticate()方法,源代码如下:

protected AuthenticationInfo doAuthenticate(AuthenticationToken authenticationToken) throws AuthenticationException {
        assertRealmsConfigured();
        Collection<Realm> realms = getRealms();
        if (realms.size() == 1) {
            return doSingleRealmAuthentication(realms.iterator().next(), authenticationToken);
        } else {
            return doMultiRealmAuthentication(realms, authenticationToken);
        }
    }

这段代码的意思是:当只有一个Realm时,就使用这个Realm,当配置了多个Realm时,会使用所有配置的Realm。 
  现在,为了实现需求,我会创建一个org.apache.shiro.authc.pam.ModularRealmAuthenticator的子类,并重写doAuthenticate()方法,让特定的Realm完成特定的功能。如何区分呢?我会同时创建一个org.apache.shiro.authc.UsernamePasswordToken的子类,在其中添加一个字段loginType,用来标识登录的类型,即是普通用户登录,还是管理员登录。具体步骤如下: 

1:创建枚举类LoginType用以记录登录的类型:

//登录类型
//普通用户登录,管理员登录
public enum LoginType {
    USER("User"),  ADMIN("Admin");

    private String type;

    private LoginType(String type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return this.type.toString();
    }
}

2.新建org.apache.shiro.authc.UsernamePasswordToken的子类CustomizedToken:

import org.apache.shiro.authc.UsernamePasswordToken;

public class CustomizedToken extends UsernamePasswordToken {

    //登录类型,判断是普通用户登录,教师登录还是管理员登录
    private String loginType;

    public CustomizedToken(final String username, final String password,String loginType) {
        super(username,password);
        this.loginType = loginType;
    }

    public String getLoginType() {
        return loginType;
    }

    public void setLoginType(String loginType) {
        this.loginType = loginType;
    }
}

3.新建org.apache.shiro.authc.pam.ModularRealmAuthenticator的子类CustomizedModularRealmAuthenticator:

import java.util.ArrayList;
import java.util.Collection;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.pam.ModularRealmAuthenticator;
import org.apache.shiro.realm.Realm;

/**
 * @author Alan_Xiang 
 * 自定义Authenticator
 * 注意,当需要分别定义处理普通用户和管理员验证的Realm时,对应Realm的全类名应该包含字符串“User”,或者“Admin”。
 * 并且,他们不能相互包含,例如,处理普通用户验证的Realm的全类名中不应该包含字符串"Admin"。
 */
public class CustomizedModularRealmAuthenticator extends ModularRealmAuthenticator {

    @Override
    protected AuthenticationInfo doAuthenticate(AuthenticationToken authenticationToken)
            throws AuthenticationException {
        // 判断getRealms()是否返回为空
        assertRealmsConfigured();
        // 强制转换回自定义的CustomizedToken
        CustomizedToken customizedToken = (CustomizedToken) authenticationToken;
        // 登录类型
        String loginType = customizedToken.getLoginType();
        // 所有Realm
        Collection<Realm> realms = getRealms();
        // 登录类型对应的所有Realm
        Collection<Realm> typeRealms = new ArrayList<>();
        for (Realm realm : realms) {
            if (realm.getName().contains(loginType))
                typeRealms.add(realm);
        }

        // 判断是单Realm还是多Realm
        if (typeRealms.size() == 1)
            return doSingleRealmAuthentication(typeRealms.iterator().next(), customizedToken);
        else
            return doMultiRealmAuthentication(typeRealms, customizedToken);
    }

}

4.创建分别处理普通用户登录和管理员登录的Realm: 

UserRealm:

import javax.annotation.Resource;



import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;

import com.ang.elearning.po.User;
import com.ang.elearning.service.IUserService;

public class UserRealm extends AuthorizingRealm {

    @Resource
    IUserService userService;

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        return null;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        User user = null;
        // 1. 把AuthenticationToken转换为CustomizedToken
        CustomizedToken customizedToken = (CustomizedToken) token;
        // 2. 从CustomizedToken中获取email
        String email = customizedToken.getUsername();
        // 3. 若用户不存在,抛出UnknownAccountException异常
        user = userService.getUserByEmail(email);
        if (user == null)
            throw new UnknownAccountException("用户不存在!");
        // 4.
        // 根据用户的情况,来构建AuthenticationInfo对象并返回,通常使用的实现类为SimpleAuthenticationInfo
        // 以下信息从数据库中获取
        // (1)principal:认证的实体信息,可以是email,也可以是数据表对应的用户的实体类对象
        Object principal = email;
        // (2)credentials:密码
        Object credentials = user.getPassword();
        // (3)realmName:当前realm对象的name,调用父类的getName()方法即可
        String realmName = getName();
        // (4)盐值:取用户信息中唯一的字段来生成盐值,避免由于两个用户原始密码相同,加密后的密码也相同
        ByteSource credentialsSalt = ByteSource.Util.bytes(email);
        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(principal, credentials, credentialsSalt,
                realmName);
        return info;
    }

}

AdminRealm:

import javax.annotation.Resource;

import org.apache.shiro.authc.AuthenticationException;

import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;

import com.ang.elearning.po.Admin;
import com.ang.elearning.service.IAdminService;


public class AdminRealm extends AuthorizingRealm {

    @Resource
    private IAdminService adminService;

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        Admin admin = null;
        // 1. 把AuthenticationToken转换为CustomizedToken
        CustomizedToken customizedToken = (CustomizedToken) token;
        // 2. 从CustomizedToken中获取username
        String username = customizedToken.getUsername();
        // 3. 若用户不存在,抛出UnknownAccountException异常
        admin = adminService.getAdminByUsername(username);
        if (admin == null)
            throw new UnknownAccountException("用户不存在!");
        // 4.
        // 根据用户的情况,来构建AuthenticationInfo对象并返回,通常使用的实现类为SimpleAuthenticationInfo
        // 以下信息从数据库中获取
        // (1)principal:认证的实体信息,可以是username,也可以是数据表对应的用户的实体类对象
        Object principal = username;
        // (2)credentials:密码
        Object credentials = admin.getPassword();
        // (3)realmName:当前realm对象的name,调用父类的getName()方法即可
        String realmName = getName();
        // (4)盐值:取用户信息中唯一的字段来生成盐值,避免由于两个用户原始密码相同,加密后的密码也相同
        ByteSource credentialsSalt = ByteSource.Util.bytes(username);
        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(principal, credentials, credentialsSalt,
                realmName);
        return info;
    }

}

5.在spring配置文件中指定使用自定义的认证器:(其他配置略)


 <!-- 配置SecurityManager -->
    <bean id="securityManager">
        <property name="cacheManager" ref="cacheManager" />
        <property name="authenticator" ref="authenticator"></property>
        <!-- 可以配置多个Realm,其实会把realms属性赋值给ModularRealmAuthenticator的realms属性 -->
        <property name="realms">
            <list>
                <ref bean="userRealm" />
                <ref bean="adminRealm"/>
            </list>
        </property>
    </bean>

  <!-- 配置使用自定义认证器,可以实现多Realm认证,并且可以指定特定Realm处理特定类型的验证 -->
    <bean id="authenticator">
        <!-- 配置认证策略,只要有一个Realm认证成功即可,并且返回所有认证成功信息 -->
        <property name="authenticationStrategy">
            <bean></bean>
        </property>
    </bean>

    <!-- 配置Realm -->
    <bean id="userRealm">
        <!-- 配置密码匹配器 -->
        <property name="credentialsMatcher">
            <bean>
                <!-- 加密算法为MD5 -->
                <property name="hashAlgorithmName" value="MD5"></property>
                <!-- 加密次数 -->
                <property name="hashIterations" value="1024"></property>
            </bean>
        </property>
    </bean>

    <bean id="adminRealm">
        <!-- 配置密码匹配器 -->
        <property name="credentialsMatcher">
            <bean>
                <!-- 加密算法为MD5 -->
                <property name="hashAlgorithmName" value="MD5"></property>
                <!-- 加密次数 -->
                <property name="hashIterations" value="1024"></property>
            </bean>
        </property>
    </bean>

6.配置控制器: 

UserController:

@Controller
@RequestMapping("/user")
public class UserController {

    private static final String USER_LOGIN_TYPE = LoginType.USER.toString();

    @Resource
    private IUserService userService;

    @RequestMapping(value = "login", method = RequestMethod.POST)
    public String login(@RequestParam("email") String email, @RequestParam("password") String password) {
        Subject currentUser = SecurityUtils.getSubject();
        if (!currentUser.isAuthenticated()) {
            CustomizedToken customizedToken = new CustomizedToken(email, password, USER_LOGIN_TYPE);
            customizedToken.setRememberMe(false);
            try {
                currentUser.login(customizedToken);
                return "user/index";
            } catch (IncorrectCredentialsException ice) {
                System.out.println("邮箱/密码不匹配!");
            } catch (LockedAccountException lae) {
                System.out.println("账户已被冻结!");
            } catch (AuthenticationException ae) {
                System.out.println(ae.getMessage());
            }
        }
        return "redirect:/login.jsp";
    }
}
  AdminController:

@Controller
@RequestMapping("/admin")
public class AdminController {

    private static final String ADMIN_LOGIN_TYPE = LoginType.ADMIN.toString();

    @RequestMapping(value="/login",method=RequestMethod.POST)
    public String login(@RequestParam("username") String username,@RequestParam("password") String password){
        Subject currentUser = SecurityUtils.getSubject();
        if(!currentUser.isAuthenticated()){
            CustomizedToken customizedToken = new CustomizedToken(username, password, ADMIN_LOGIN_TYPE);
            customizedToken.setRememberMe(false);
            try {
                currentUser.login(customizedToken);
                return "admin/index";
            } catch (IncorrectCredentialsException ice) {
                System.out.println("用户名/密码不匹配!");
            } catch (LockedAccountException lae) {
                System.out.println("账户已被冻结!");
            } catch (AuthenticationException ae) {
                System.out.println(ae.getMessage());
            }
        }
        return "redirect:/login.jsp";
    }
}

7.测试页面:login.jsp

<body>
    <form action="${pageContext.request.contextPath }/user/login"
        method="POST">
        邮箱:<input type="text" name="email"> 
        <br><br> 
        密码:<input type="password" name="password"> 
        <br><br> 
        <input type="submit" value="用户登录">
    </form>
    <br>
    <br>
    <form action="${pageContext.request.contextPath }/admin/login"
        method="POST">
        用户名:<input type="text" name="username"> 
        <br><br> 
        密 码:<input type="password" name="password"> 
        <br><br> 
        <input type="submit" value="管理员登录">
    </form>
</body>

这就实现了UserRealm用以处理普通用户的登录验证,AdminRealm用以处理管理员的登录验证。 
  如果还需要添加其他类型,例如,需要添加一个教师登录模块,只需要再新建一个TeacherRealm,并且在枚举类loginType中添加教师的信息,再完成其他类似的配置即可。

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