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来自你的消息:

给我一个完整的springboot实现jwt的例子,login实现token生成,show1,要验证token,token保存时间为一天,show1要检验token是否过期

来自 ChatGPT 的消息:

我可以给你一个简化版的Spring Boot和JWT的实现示例。这个示例会包含以下内容:

  1. 一个简单的登录接口,用于生成JWT令牌
  2. 一个需要验证JWT令牌的受保护接口
  3. JWT令牌的有效期设置为1天

首先,你需要在你的Spring Boot项目中添加以下依赖:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

然后,创建一个JwtUtil类来处理JWT的生成和验证:

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.function.Function;

@Component
public class JwtUtil {

    private String SECRET_KEY = "my_secret_key";

    public String generateToken(String username) {
        return Jwts.builder()
                .setSubject(username)
                .setIssuedAt(new Date(System.currentTimeMillis()))
                .setExpiration(new Date(System.currentTimeMillis() + 1000 * 60 * 60 * 24))
                .signWith(SignatureAlgorithm.HS256, SECRET_KEY)
                .compact();
    }

    public boolean validateToken(String token, String username) {
        return getUsernameFromToken(token).equals(username) && !isTokenExpired(token);
    }

    private String getUsernameFromToken(String token) {
        return getClaimFromToken(token, Claims::getSubject);
    }

    private boolean isTokenExpired(String token) {
        return getExpirationDateFromToken(token).before(new Date());
    }

    private Date getExpirationDateFromToken(String token) {
        return getClaimFromToken(token, Claims::getExpiration);
    }

    private <T> T getClaimFromToken(String token, Function<Claims, T> claimsResolver) {
        Claims claims = Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token).getBody();
        return claimsResolver.apply(claims);
    }
}

接下来,你需要配置Spring Security以使用JWT。创建一个SecurityConfig类,继承WebSecurityConfigurerAdapter

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.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.factory.PasswordEncoderFactories;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    private JwtRequestFilter jwtRequestFilter;

    public SecurityConfig(JwtRequestFilter jwtRequestFilter) {
        this.jwtRequestFilter = jwtRequestFilter;
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);

        http.addFilterBefore(jwtRequestFilter, UsernamePasswordAuthenticationFilter.class);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService()).passwordEncoder(passwordEncoder());
    }

    @Override
    protected UserDetailsService userDetailsService() {
        InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
        manager.createUser(User.withUsername("user").password(passwordEncoder().encode("password")).roles("USER").build());
        return manager;
    }

    private PasswordEncoder passwordEncoder() {
        return PasswordEncoderFactories.createDelegatingPasswordEncoder();
    }
}

创建一个JwtRequestFilter类,用于验证每个请求的JWT令牌:

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

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

@Component
public class JwtRequestFilter extends OncePerRequestFilter {

    private JwtUtil jwtUtil;
    private UserDetailsService userDetailsService;

    public JwtRequestFilter(JwtUtil jwtUtil, UserDetailsService userDetailsService) {
        this.jwtUtil = jwtUtil;
        this.userDetailsService = userDetailsService;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        final String authorizationHeader = request.getHeader("Authorization");

        String username = null;
        String jwt = null;

        if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) {
            jwt = authorizationHeader.substring(7);
            username = jwtUtil.getUsernameFromToken(jwt);
        }

        if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
            UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);

            if (jwtUtil.validateToken(jwt, userDetails.getUsername())) {
                UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                        userDetails, null, userDetails.getAuthorities());
                authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
            }
        }

        filterChain.doFilter(request, response);
    }
}

最后,创建一个简单的REST控制器,包含登录和受保护的接口:

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ApiController {

    private JwtUtil jwtUtil;

    public ApiController(JwtUtil jwtUtil) {
        this.jwtUtil = jwtUtil;
    }

    @PostMapping("/login")
    public String login(@RequestParam("username") String username, @RequestParam("password") String password) {
        // 这里简化了身份验证过程,实际项目中需要验证用户的用户名和密码
        return jwtUtil.generateToken(username);
    }

    @GetMapping("/show1")
    public String show1() {
        return "这是一个受保护的接口,需要验证JWT令牌";
    }
}

这个示例仅用于演示目的。实际项目中,你可能需要根据自己的需求进行相应的调整和优化。

来自你的消息:

要实现token过期检查

来自 ChatGPT 的消息:

在上面的示例中,我们已经实现了JWT令牌的过期检查。JwtUtil类中的isTokenExpired方法用于检查令牌是否已过期。validateToken方法会调用isTokenExpired方法来确保令牌在验证过程中没有过期。

这是JwtUtil类中的相关代码:

public boolean validateToken(String token, String username) {
    return getUsernameFromToken(token).equals(username) && !isTokenExpired(token);
}

private boolean isTokenExpired(String token) {
    return getExpirationDateFromToken(token).before(new Date());
}

private Date getExpirationDateFromToken(String token) {
    return getClaimFromToken(token, Claims::getExpiration);
}

JwtRequestFilter类中,我们使用validateToken方法来验证令牌。如果令牌有效且未过期,请求将被允许访问受保护的资源。以下是JwtRequestFilter类中的相关代码:

if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
    UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);

    if (jwtUtil.validateToken(jwt, userDetails.getUsername())) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                userDetails, null, userDetails.getAuthorities());
        authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
    }
}

这样,当令牌过期时,验证将失败,用户将无法访问受保护的资源。如果你需要在令牌过期后返回一个特定的错误消息,你可以在JwtRequestFilter类的doFilterInternal方法中捕获这种情况并设置适当的响应。例如,你可以在验证失败时设置响应状态为401 Unauthorized

if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
    UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);

    if (jwtUtil.validateToken(jwt, userDetails.getUsername())) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                userDetails, null, userDetails.getAuthorities());
        authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
    } else {
        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        response.getWriter().write("令牌无效或已过期");
        return;
    }
}

这样,当令牌过期或无效时,用户将收到一个包含错误消息的401 Unauthorized响应。

来自你的消息:

show2不需要token怎么做

来自 ChatGPT 的消息:

要允许访问不需要JWT令牌的接口,你需要在SecurityConfig类中的configure方法中配置相应的路径。你可以使用antMatchers方法来指定不需要身份验证的路径。在这个例子中,我们将添加一个名为/show2的新接口,并将其配置为允许无需身份验证即可访问。

首先,在ApiController类中添加新的接口:

@GetMapping("/show2")
public String show2() {
    return "这是一个不需要验证JWT令牌的接口";
}

接下来,在SecurityConfig类中的configure方法中添加/show2路径,使其允许无需身份验证即可访问:

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.csrf().disable()
            .authorizeRequests()
            .antMatchers("/login", "/show2").permitAll()
            .anyRequest().authenticated()
            .and()
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);

    http.addFilterBefore(jwtRequestFilter, UsernamePasswordAuthenticationFilter.class);
}

现在,/show2接口将不再需要JWT令牌,任何用户都可以访问。其他接口(如/show1)仍然需要有效的令牌才能访问。

来自你的消息:

要帮我实现用用户名生成token

来自 ChatGPT 的消息:

要使用用户名生成JWT令牌,您可以在JwtUtil类中创建一个新方法,该方法接受一个用户名作为参数。以下是如何实现这个方法的示例:

  1. 首先,在JwtUtil类中,添加一个新方法generateTokenByUsername
public String generateTokenByUsername(String username) {
    Map<String, Object> claims = new HashMap<>();
    return createToken(claims, username);
}
  1. 修改createToken方法,使其接受一个用户名参数:
private String createToken(Map<String, Object> claims, String subject) {
    return Jwts.builder()
            .setClaims(claims)
            .setSubject(subject)
            .setIssuedAt(new Date(System.currentTimeMillis()))
            .setExpiration(new Date(System.currentTimeMillis() + JWT_TOKEN_VALIDITY * 1000))
            .signWith(SignatureAlgorithm.HS256, SECRET_KEY)
            .compact();
}
  1. ApiController类中,添加一个新的接口/generateToken,该接口将接受一个用户名参数,并使用JwtUtil类中的generateTokenByUsername方法生成令牌:
@Autowired
private JwtUtil jwtUtil;

@PostMapping("/generateToken")
public ResponseEntity<?> generateToken(@RequestParam("username") String username) {
    final String token = jwtUtil.generateTokenByUsername(username);
    return ResponseEntity.ok(new AuthenticationResponse(token));
}

现在,您可以通过调用/generateToken接口并传递一个用户名参数来生成一个JWT令牌。请注意,这个实现不会检查用户名是否有效或存在于您的用户存储中。您可能需要添加额外的逻辑来验证用户名,例如从数据库中加载用户并检查其凭据。

   
分类:未分类 作者:吃我一拂尘 发表于:2023-11-20 01:29:55 阅读量:110
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