java - Spring使用JWT身份验证，获取当前用户

Question

我有 Spring Boot REST 应用程序，它使用 JWT token 进行授权。我想使用 @AuthenticationPrincipal 注释获取 Controller 中当前登录的用户。但如果我从 loadUserByUsername 返回自定义模型并且身份验证停止工作，它总是返回 null。我的模型实现了UserDetails。

我尝试扩展org.springframework.security.core.userdetails.User，但我从JWTAuthenticationFilter中删除了默认构造函数不存在的错误(ApplicationUser creds = new ObjectMapper().readValue(req.getInputStream(), ApplicationUser.class);)

怎么了？

UserDetailsS​​erviceImpl.java

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    private UserRepository userRepository;

    public UserDetailsServiceImpl(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        ApplicationUser applicationUser = userRepository.findByUsername(username);
        if (applicationUser == null) throw new UsernameNotFoundException(username);

        return applicationUser;
    }
}

ApplicationUser.java(模型)

@Entity
@Table(name = "users")
public class ApplicationUser implements UserDetails {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @Column(unique = true, nullable = false)
    private String username;

    @Column(unique = true, nullable = false)
    private String email;

    @Column(nullable = false)
    private String password;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public boolean isAccountNonExpired() {
        return false;
    }

    @Override
    public boolean isAccountNonLocked() {
        return false;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return false;
    }

    @Override
    public boolean isEnabled() {
        return false;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }
}

JWTAuthenticationFilter

public class JWTAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
    private AuthenticationManager authenticationManager;

    public JWTAuthenticationFilter(AuthenticationManager authenticationManager) {
        super(new AntPathRequestMatcher(LOGIN_URL));

        this.authenticationManager = authenticationManager;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest req,
                                                HttpServletResponse res) throws AuthenticationException {
        try {
            ApplicationUser creds = new ObjectMapper()
                    .readValue(req.getInputStream(), ApplicationUser.class);

            return authenticationManager.authenticate(
                    new UsernamePasswordAuthenticationToken(
                            creds.getUsername(),
                            creds.getPassword(),
                            new ArrayList<>())
            );
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest req,
                                            HttpServletResponse res,
                                            FilterChain chain,
                                            Authentication auth) throws IOException, ServletException {

        String token = Jwts.builder()
                .setSubject(((ApplicationUser) auth.getPrincipal()).getUsername())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRATION_TIME))
                .signWith(SignatureAlgorithm.HS512, SECRET.getBytes())
                .compact();

        res.addHeader(HEADER_STRING, TOKEN_PREFIX + token);
    }
}

JWTAuthorizationFilter

public class JWTAuthorizationFilter extends BasicAuthenticationFilter {

    public JWTAuthorizationFilter(AuthenticationManager authManager) {
        super(authManager);
    }

    @Override
    protected void doFilterInternal(HttpServletRequest req,
                                    HttpServletResponse res,
                                    FilterChain chain) throws IOException, ServletException {
        String header = req.getHeader(HEADER_STRING);

        if (header == null || !header.startsWith(TOKEN_PREFIX)) {
            chain.doFilter(req, res);
            return;
        }

        UsernamePasswordAuthenticationToken authentication = getAuthentication(req);

        SecurityContextHolder.getContext().setAuthentication(authentication);
        chain.doFilter(req, res);
    }

    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
        String token = request.getHeader(HEADER_STRING);
        if (token != null) {
            // parse the token.
            String user;
            try {
                user = Jwts.parser()
                        .setSigningKey(SECRET.getBytes())
                        .parseClaimsJws(token.replace(TOKEN_PREFIX, ""))
                        .getBody()
                        .getSubject();
            } catch (SignatureException e) {
                return null;
            }

            if (user != null) return new UsernamePasswordAuthenticationToken(user, null, new ArrayList<>());

            return null;
        }
        return null;
    }
}

Answer 1

在您的情况下，@AuthenticationPrincipal 将返回带有用户名的字符串，您可以通过调用 Controller 中的存储库并通过用户名获取用户或将存储库声明为 @Bean 并执行以下操作来获取用户:

public class JWTAuthorizationFilter extends BasicAuthenticationFilter {

//Get the repository
private UserRepository userRepository;

public JWTAuthorizationFilter(AuthenticationManager authManager) {
    super(authManager);
}

@Override
protected void doFilterInternal(HttpServletRequest req,
                                HttpServletResponse res,
                                FilterChain chain) throws IOException, ServletException {
    String header = req.getHeader(HEADER_STRING);

    if (header == null || !header.startsWith(TOKEN_PREFIX)) {
        chain.doFilter(req, res);
        return;
    }

    UsernamePasswordAuthenticationToken authentication = getAuthentication(req);

    SecurityContextHolder.getContext().setAuthentication(authentication);
    chain.doFilter(req, res);
}

private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
    String token = request.getHeader(HEADER_STRING);
    if (token != null) {
        // parse the token.
        String user;
        try {
            user = Jwts.parser()
                    .setSigningKey(SECRET.getBytes())
                    .parseClaimsJws(token.replace(TOKEN_PREFIX, ""))
                    .getBody()
                    .getSubject();
        } catch (SignatureException e) {
            return null;
        }

        //Get your user
        UserEntity userEntity = this.userRepository.findByUsername(user);

        if (user != null) {
             //Seting in your AuthenticationPrincipal the user
             return new UsernamePasswordAuthenticationToken(userEntity, null, new ArrayList<>());
        }

        return null;
    }
    return null;
}

}