SpringSecurity學習之自定義過濾器的實現代碼

這篇文章主要介紹了SpringSecurity學習之自定義過濾器的實現代碼，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨着小編來一起學習學習吧

我們系統中的認證場景通常比較複雜，比如說用戶被鎖定無法登錄，限制登錄IP等。而SpringSecuriy最基本的是基於用戶與密碼的形式進行認證，由此可知它的一套驗證規範根本無法滿足業務需要，因此擴展勢在必行。那麼我們可以考慮自己定義filter添加至SpringSecurity的過濾器棧當中，來實現我們自己的驗證需要。

本例中，基於前篇的數據庫的Student表來模擬一個簡單的例子：當Student的jointime在當天之後，那麼才允許登錄

一、創建自己定義的Filter

我們先在web包下創建好幾個包並定義如下幾個類

CustomerAuthFilter:

package com.bdqn.lyrk.security.study.web.filter;

import com.bdqn.lyrk.security.study.web.authentication.UserJoinTimeAuthentication;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


public class CustomerAuthFilter extends AbstractAuthenticationProcessingFilter {

  private AuthenticationManager authenticationManager;


  public CustomerAuthFilter(AuthenticationManager authenticationManager) {

    super(new AntPathRequestMatcher("/login", "POST"));
    this.authenticationManager = authenticationManager;

  }

  @Override
  public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException, IOException, ServletException {
    String username = request.getParameter("username");
    UserJoinTimeAuthentication usernamePasswordAuthenticationToken =new UserJoinTimeAuthentication(username);
    Authentication authentication = this.authenticationManager.authenticate(usernamePasswordAuthenticationToken);
    if (authentication != null) {
      super.setContinueChainBeforeSuccessfulAuthentication(true);
    }
    return authentication;
  }
}

該類繼承AbstractAuthenticationProcessingFilter，這個filter的作用是對最基本的用戶驗證的處理，我們必須重寫attemptAuthentication方法。Authentication接口表示授權接口，通常情況下業務認證通過時會返回一個這個對象。super.setContinueChainBeforeSuccessfulAuthentication(true) 設置成true的話，會交給其他過濾器處理。

二、定義UserJoinTimeAuthentication

package com.bdqn.lyrk.security.study.web.authentication;

import org.springframework.security.authentication.AbstractAuthenticationToken;

public class UserJoinTimeAuthentication extends AbstractAuthenticationToken {
  private String username;

  public UserJoinTimeAuthentication(String username) {
    super(null);
    this.username = username;
  }


  @Override
  public Object getCredentials() {
    return null;
  }

  @Override
  public Object getPrincipal() {
    return username;
  }
}

自定義授權方式，在這裏接收username的值處理，其中getPrincipal我們可以用來存放登錄名，getCredentials可以存放密碼，這些方法來自於Authentication接口

三、定義AuthenticationProvider

package com.bdqn.lyrk.security.study.web.authentication;

import com.bdqn.lyrk.security.study.app.pojo.Student;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;

import java.util.Date;

/**
 * 基本的驗證方式
 *
 * @author chen.nie
 * @date 2018/6/12
 **/
public class UserJoinTimeAuthenticationProvider implements AuthenticationProvider {
  private UserDetailsService userDetailsService;

  public UserJoinTimeAuthenticationProvider(UserDetailsService userDetailsService) {
    this.userDetailsService = userDetailsService;
  }

  /**
   * 認證授權，如果jointime在當前時間之後則認證通過
   * @param authentication
   * @return
   * @throws AuthenticationException
   */
  @Override
  public Authentication authenticate(Authentication authentication) throws AuthenticationException {
    String username = (String) authentication.getPrincipal();
    UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
    if (!(userDetails instanceof Student)) {
      return null;
    }
    Student student = (Student) userDetails;
    if (student.getJoinTime().after(new Date()))
      return new UserJoinTimeAuthentication(username);
    return null;
  }

  /**
   * 只處理UserJoinTimeAuthentication的認證
   * @param authentication
   * @return
   */
  @Override
  public boolean supports(Class<?> authentication) {
    return authentication.getName().equals(UserJoinTimeAuthentication.class.getName());
  }
}

AuthenticationManager會委託AuthenticationProvider進行授權處理，在這裏我們需要重寫support方法，該方法定義Provider支持的授權對象，那麼在這裏我們是對UserJoinTimeAuthentication處理。

四、WebSecurityConfig

package com.bdqn.lyrk.security.study.app.config;

import com.bdqn.lyrk.security.study.app.service.UserService;
import com.bdqn.lyrk.security.study.web.authentication.UserJoinTimeAuthenticationProvider;
import com.bdqn.lyrk.security.study.web.filter.CustomerAuthFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

/**
 * spring-security的相關配置
 *
 * @author chen.nie
 * @date 2018/6/7
 **/
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

  @Autowired
  private UserService userService;

  @Override
  protected void configure(HttpSecurity http) throws Exception {
    /*
      1.配置靜態資源不進行授權驗證
      2.登錄地址及跳轉過後的成功頁不需要驗證
      3.其餘均進行授權驗證
     */
    http.
        authorizeRequests().antMatchers("/static/**").permitAll().
        and().authorizeRequests().antMatchers("/user/**").hasRole("7022").
        and().authorizeRequests().anyRequest().authenticated().
        and().formLogin().loginPage("/login").successForwardUrl("/toIndex").permitAll()
        .and().logout().logoutUrl("/logout").invalidateHttpSession(true).deleteCookies().permitAll()
    ;

    http.addFilterBefore(new CustomerAuthFilter(authenticationManager()), UsernamePasswordAuthenticationFilter.class);


  }

  @Override
  protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    //設置自定義userService
    auth.userDetailsService(userService);
    auth.authenticationProvider(new UserJoinTimeAuthenticationProvider(userService));
  }

  @Override
  public void configure(WebSecurity web) throws Exception {
    super.configure(web);
  }
}

在這裏面我們通過HttpSecurity的方法來添加我們自定義的filter，一定要注意先後順序。在AuthenticationManagerBuilder當中還需要添加我們剛纔定義的AuthenticationProvider

啓動成功後，我們將Student表裏的jointime值改爲早於今天的時間，進行登錄可以發現：

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持神馬文庫。