春季启动：CORS问题

Question

我正在使用Spring Boot版本2.0.2Release。下面是我的安全配置

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(
        prePostEnabled = true,
        securedEnabled = true,
        jsr250Enabled = true)
@ComponentScan("com.mk")
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private AuthenticationProvider myAuthenticationProvider;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();
        http.cors().configurationSource(corsConfigurationSource())
                .and()
                .csrf().disable()
                .anonymous().and()
                .authorizeRequests()
                .antMatchers(HttpMethod.GET,"/index.html").permitAll()
                .antMatchers(HttpMethod.POST,"/login").permitAll()
                .antMatchers(HttpMethod.GET,"*").authenticated()
                .and().httpBasic();
    }
    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("*"));
        configuration.setAllowedMethods(Arrays.asList("GET","POST"));
        configuration.setAllowCredentials(true);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

由于CORS的问题，我无法调用任何API（包括login是allowAll）。

在浏览器上，我得到了（它与Postman一起使用，因为在那里没有进行CORS检查）

无法加载http：// localhost：8080 / myurl：对预检请求的响应未通过访问控制检查：所请求的资源上没有'Access-Control-Allow-Origin'标头。因此，不允许访问源' http：// localhost：4200 '。响应的HTTP状态码为403。

Answer 1

从 Spring 查看本指南：

https://spring.io/guides/gs/rest-service-cors/

在 Spring Boot 中添加 CORS 支持的方法很少。

使用全局配置：

@Bean
public WebMvcConfigurer corsConfigurer() {
    return new WebMvcConfigurerAdapter() {
        @Override
        public void addCorsMappings(CorsRegistry registry) {
            registry.addMapping("/greeting-javaconfig").allowedOrigins("http://localhost:9000");
        }
    };
}

并使用@CrossOrigin注释：

@CrossOrigin(origins = "http://localhost:9000")
@GetMapping("/greeting")
public Greeting greeting(@RequestParam(required=false, defaultValue="World") String name) {
    System.out.println("==== in greeting ====");
    return new Greeting(counter.incrementAndGet(), String.format(template, name));
}

Answer 2

无需添加任何额外的Filters或WebMvcConfigurer。主要问题是'Access-Control-Allow-Origin'没有出现在标头中，因为corsConfigurationSource没有添加必要的配置来获取相关的 CORS 响应标头。因此，我们配置时必须添加以下缺少的配置CorsConfigurationSource

configuration.addAllowedOrigin("*");
configuration.addAllowedHeader("*");
configuration.addAllowedMethod("*");

我们必须CorsConfigurationSource 如下配置 cors

 @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
            .cors().configurationSource(corsConfigurationSource())
                .and()
                 .....
  }

 @Bean
    CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("*"));
        configuration.setAllowedMethods(Arrays.asList("GET","POST"));
        configuration.setAllowCredentials(true);
        //the below three lines will add the relevant CORS response headers
        configuration.addAllowedOrigin("*");
        configuration.addAllowedHeader("*");
        configuration.addAllowedMethod("*");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

如果有人CORS在使用以下组合时遇到 Spring Boot 2.4.0 及更高版本的问题，请参考答案

CorsConfigurationSource#setAllowedOrigins 价值为 *

和

CorsConfigurationSource#setAllowCredentials 价值为 true

Answer 3

尽管Spring安全性提供了一种在http configurer中配置CORS的方法，但是有一种更加干净的方法可以将CORS过滤器添加到应用程序中，

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class MyCORSFilter implements Filter {


@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;

    response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
    response.setHeader("Access-Control-Allow-Credentials", "true");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With, remember-me");

    chain.doFilter(req, res);
}

@Override
public void init(FilterConfig filterConfig) {
}

@Override
public void destroy() {
}

}

对过滤器进行最高优先级排序可确保MyCORSFilter实现javax.servlet.Filter是链中的第一个实现。希望这可以帮助