Spring security 重写Filter 实现 json 登录

在使用SpringSecurity中，大伙都知道默认的登录数据是通过key/value的形式来传递的，默认情况下不支持JSON格式的登录数据，如果有这种需求，就需要自己来解决，本文主要解决此问题：

使用JSON登录

上面演示的是一种原始的登录方案，如果想将用户名密码通过JSON的方式进行传递，则需要自定义相关过滤器，通过分析源码我们发现，默认的用户名密码提取在UsernamePasswordAuthenticationFilter过滤器中，部分源码如下：

public class UsernamePasswordAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
    public static final String SPRING_SECURITY_FORM_USERNAME_KEY = "username";
    public static final String SPRING_SECURITY_FORM_PASSWORD_KEY = "password";
    private String usernameParameter = SPRING_SECURITY_FORM_USERNAME_KEY;
    private String passwordParameter = SPRING_SECURITY_FORM_PASSWORD_KEY;
    private boolean postOnly = true;

    public UsernamePasswordAuthenticationFilter() {
        super(new AntPathRequestMatcher("/login", "POST"));
    }

    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        if (postOnly && !request.getMethod().equals("POST")) {
            throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());
        }
        String username = obtainUsername(request);
        String password = obtainPassword(request);
        if (username == null) {
            username = "";
        }
        if (password == null) {
            password = "";
        }
        username = username.trim();
        UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);        // Allow subclasses to set the "details" property        
        setDetails(request, authRequest);
        return this.getAuthenticationManager().authenticate(authRequest);
    }

    protected String obtainPassword(HttpServletRequest request) {
        return request.getParameter(passwordParameter);
    }

    protected String obtainUsername(HttpServletRequest request) {
        return request.getParameter(usernameParameter);
    }    
    //...    
    //...
}

从这里可以看到，默认的用户名/密码提取就是通过request中的getParameter来提取的，如果想使用JSON传递用户名密码，只需要将这个过滤器替换掉即可，自定义过滤器如下：

public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
    
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        if (request.getContentType().equals(MediaType.APPLICATION_JSON_UTF8_VALUE) || request.getContentType().equals(MediaType.APPLICATION_JSON_VALUE)) {
            ObjectMapper mapper = new ObjectMapper();
            UsernamePasswordAuthenticationToken authRequest = null;
            try (InputStream is = request.getInputStream()) {
                Map<String, String> authenticationBean = mapper.readValue(is, Map.class);
                authRequest = new UsernamePasswordAuthenticationToken(authenticationBean.get("username"), authenticationBean.get("password"));
            } catch (IOException e) {
                e.printStackTrace();
                authRequest = new UsernamePasswordAuthenticationToken("", "");
            } finally {
                setDetails(request, authRequest);
                return this.getAuthenticationManager().authenticate(authRequest);
            }
        } else {
            return super.attemptAuthentication(request, response);
        }
    }
}

这里只是将用户名/密码的获取方案重新修正下，改为了从JSON中获取用户名密码，然后在SecurityConfig中作出如下修改：

@Override
protected void configure(HttpSecurity http) throws Exception {
            http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().csrf().disable();
            http.addFilterAt(customAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class);
}

@Bean
CustomAuthenticationFilter customAuthenticationFilter() throws Exception {
            CustomAuthenticationFilter filter = new CustomAuthenticationFilter();
            filter.setAuthenticationSuccessHandler(new AuthenticationSuccessHandler() {
                @Override
                public void onAuthenticationSuccess(HttpServletRequest req, HttpServletResponse resp, Authentication authentication) throws IOException, ServletException {
                    resp.setContentType("application/json;charset=utf-8");
                    PrintWriter out = resp.getWriter();
                    RespBean respBean = RespBean.ok("登录成功!");
                    out.write(new ObjectMapper().writeValueAsString(respBean));
                    out.flush();
                    out.close();
                }
            });
            filter.setAuthenticationFailureHandler(new AuthenticationFailureHandler() {
                @Override
                public void onAuthenticationFailure(HttpServletRequest req, HttpServletResponse resp, AuthenticationException e) throws IOException, ServletException {
                    resp.setContentype("application/json;charset=utf-8");
                    PrintWriter out = resp.getWriter();
                    RespBean respBean = RespBean.error("登录失败!");
                    out.write(new ObjectMapper().writeValueAsString(respBean));
                    out.flush();
                    out.close();
                }
            });
            filter.setAuthenticationManager(authenticationManagerBean());
            return filter;
        }

搞定