Springboot升级至2.4.0中出现的跨域问题分析及修改方案

问题

Springboot升级至2.4.0中出现的跨域问题。
在Springboot 2.4.0版本之前使用的是2.3.5.RELEASE，对应的Spring版本为5.2.10.RELEASE。
升级至2.4.0后，对应的Spring版本为5.3.1。
Springboot2.3.5.RELEASE时，我们可以使用CorsFilter设置跨域。

分析

版本2.3.5.RELEASE 设置跨域

设置代码如下：

@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
  @Bean
  public CorsFilter corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    CorsConfiguration config = new CorsConfiguration();
    config.setAllowCredentials(true);
    // 允许访问的客户端域名
    config.addAllowedOrigin("*");
    // 允许服务端访问的客户端请求头
    config.addAllowedHeader("*");
    // 允许访问的方法名,GET POST等
    config.addAllowedMethod("*");
    // 对接口配置跨域设置
    source.registerCorsConfiguration("/**" , config);
    return new CorsFilter(source);
  }
}

是允许使用*设置允许的Origin。
这里我们看一下类CorsFilter的源码，5.3.x版本开始，针对CorsConfiguration新增了校验

5.3.x源码分析 CorsFilter

/**
 * {@link javax.servlet.Filter} to handle CORS pre-flight requests and intercept
 * CORS simple and actual requests with a {@link CorsProcessor}, and to update
 * the response, e.g. with CORS response headers, based on the policy matched
 * through the provided {@link CorsConfigurationSource}.
 *
 * 
This is an alternative to configuring CORS in the Spring MVC Java config
 * and the Spring MVC XML namespace. It is useful for applications depending
 * only on spring-web (not on spring-webmvc) or for security constraints that
 * require CORS checks to be performed at {@link javax.servlet.Filter} level.
 *
 * 
This filter could be used in conjunction with {@link DelegatingFilterProxy}
 * in order to help with its initialization.
 *
 * @author Sebastien Deleuze
 * @since 4.2
 * @see CORS W3C recommendation
 * @see UrlBasedCorsConfigurationSource
 */
public class CorsFilter extends OncePerRequestFilter {

	private final CorsConfigurationSource configSource;

	private CorsProcessor processor = new DefaultCorsProcessor();


	/**
	 * Constructor accepting a {@link CorsConfigurationSource} used by the filter
	 * to find the {@link CorsConfiguration} to use for each incoming request.
	 * @see UrlBasedCorsConfigurationSource
	 */
	public CorsFilter(CorsConfigurationSource configSource) {
		Assert.notNull(configSource, "CorsConfigurationSource must not be null");
		this.configSource = configSource;
	}


	/**
	 * Configure a custom {@link CorsProcessor} to use to apply the matched
	 * {@link CorsConfiguration} for a request.
	 * 
By default {@link DefaultCorsProcessor} is used.
	 */
	public void setCorsProcessor(CorsProcessor processor) {
		Assert.notNull(processor, "CorsProcessor must not be null");
		this.processor = processor;
	}


	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
			FilterChain filterChain) throws ServletException, IOException {

		CorsConfiguration corsConfiguration = this.configSource.getCorsConfiguration(request);
		boolean isValid = this.processor.processRequest(corsConfiguration, request, response);
		if (!isValid || CorsUtils.isPreFlightRequest(request)) {
			return;
		}
		filterChain.doFilter(request, response);
	}

}

类CorsFilter继承自OncePerRequestFilter，doFilterInternal方法会被执行。类中还创建了一个默认的处理类DefaultCorsProcessor，doFilterInternal调用this.processor.processRequest
往下

processRequest

@Override
	@SuppressWarnings("resource")
	public boolean processRequest(@Nullable CorsConfiguration config, HttpServletRequest request,
			HttpServletResponse response) throws IOException {

		Collection varyHeaders = response.getHeaders(HttpHeaders.VARY);
		if (!varyHeaders.contains(HttpHeaders.ORIGIN)) {
			response.addHeader(HttpHeaders.VARY, HttpHeaders.ORIGIN);
		}
		if (!varyHeaders.contains(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD)) {
			response.addHeader(HttpHeaders.VARY, HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD);
		}
		if (!varyHeaders.contains(HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS)) {
			response.addHeader(HttpHeaders.VARY, HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS);
		}

		if (!CorsUtils.isCorsRequest(request)) {
			return true;
		}

		if (response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN) != null) {
			logger.trace("Skip: response already contains \"Access-Control-Allow-Origin\"");
			return true;
		}

		boolean preFlightRequest = CorsUtils.isPreFlightRequest(request);
		if (config == null) {
			if (preFlightRequest) {
				rejectRequest(new ServletServerHttpResponse(response));
				return false;
			}
			else {
				return true;
			}
		}

		return handleInternal(new ServletServerHttpRequest(request), new ServletServerHttpResponse(response), config, preFlightRequest);
	}

进入最后一行

handleInternal

/**
	 * Handle the given request.
	 */
	protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
			CorsConfiguration config, boolean preFlightRequest) throws IOException {

		String requestOrigin = request.getHeaders().getOrigin();
		String allowOrigin = checkOrigin(config, requestOrigin);
		(省略...)
		response.flush();
		return true;
	}

查看方法checkOrigin

checkOrigin

@Nullable
	protected String checkOrigin(CorsConfiguration config, @Nullable String requestOrigin) {
		return config.checkOrigin(requestOrigin);
	}

Go on

checkOrigin

/**
	 * Check the origin of the request against the configured allowed origins.
	 * @param requestOrigin the origin to check
	 * @return the origin to use for the response, or {@code null} which
	 * means the request origin is not allowed
	 */
	@Nullable
	public String checkOrigin(@Nullable String requestOrigin) {
		if (!StringUtils.hasText(requestOrigin)) {
			return null;
		}
		if (!ObjectUtils.isEmpty(this.allowedOrigins)) {
			if (this.allowedOrigins.contains(ALL)) {
				validateAllowCredentials();
				return ALL;
			}
			for (String allowedOrigin : this.allowedOrigins) {
				if (requestOrigin.equalsIgnoreCase(allowedOrigin)) {
					return requestOrigin;
				}
			}
		}
		if (!ObjectUtils.isEmpty(this.allowedOriginPatterns)) {
			for (OriginPattern p : this.allowedOriginPatterns) {
				if (p.getDeclaredPattern().equals(ALL) || p.getPattern().matcher(requestOrigin).matches()) {
					return requestOrigin;
				}
			}
		}
		return null;
	}

方法validateAllowCredentials

validateAllowCredentials

/**
	 * Validate that when {@link #setAllowCredentials allowCredentials} is true,
	 * {@link #setAllowedOrigins allowedOrigins} does not contain the special
	 * value {@code "*"} since in that case the "Access-Control-Allow-Origin"
	 * cannot be set to {@code "*"}.
	 * @throws IllegalArgumentException if the validation fails
	 * @since 5.3
	 */
	public void validateAllowCredentials() {
		if (this.allowCredentials == Boolean.TRUE &&
				this.allowedOrigins != null && this.allowedOrigins.contains(ALL)) {

			throw new IllegalArgumentException(
					"When allowCredentials is true, allowedOrigins cannot contain the special value \"*\"" +
							"since that cannot be set on the \"Access-Control-Allow-Origin\" response header. " +
							"To allow credentials to a set of origins, list them explicitly " +
							"or consider using \"allowedOriginPatterns\" instead.");
		}

看一下ALL是什么

/** Wildcard representing all origins, methods, or headers. */
	public static final String ALL = "*";

所以如果使用2.4.0版本，还是设置*的话，访问API接口就会报错：

异常

java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*"since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
	at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:457)
	at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:561)
	at org.springframework.web.cors.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:174)
	at org.springframework.web.cors.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:116)
	at org.springframework.web.cors.DefaultCorsProcessor.processRequest(DefaultCorsProcessor.java:95)
	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:87)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

修改方式

方式1

不使用CorsFilter，直接重写方法addCorsMappings：

@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
  /**
   * 跨域配置
   */
  @Override
  public void addCorsMappings(CorsRegistry registry) {
    //对那些请求路径进行跨域处理
    registry.addMapping("/**")
        // 允许的请求头，默认允许所有的请求头
        .allowedHeaders("*")
        // 允许的方法，默认允许GET、POST、HEAD
        .allowedMethods("*")
        // 探测请求有效时间，单位秒
        .maxAge(1800)
        // 支持的域
        .allowedOrigins("*");
  }
}

方式2

继续使用CorsFilter，使用官方推荐的allowedOriginPatterns：
application.yml中新增配置：
（注：这里只是举个栗子…Origin的处理）

# 项目相关配置
project:
 uiPort: 8082
 basePath: http://localhost:${project.uiPort}

@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
	@Value("${project.basePath}")
  private String basePath;

  @Bean
  public CorsFilter corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    CorsConfiguration config = new CorsConfiguration();
    config.setAllowCredentials(true);
    // 允许访问的客户端域名
    List allowedOriginPatterns = new ArrayList<>();
    allowedOriginPatterns.add(basePath);
    config.setAllowedOriginPatterns(allowedOriginPatterns);
//    config.addAllowedOrigin(serverPort);
    // 允许服务端访问的客户端请求头
    config.addAllowedHeader("*");
    // 允许访问的方法名,GET POST等
    config.addAllowedMethod("*");
    // 对接口配置跨域设置
    source.registerCorsConfiguration("/**" , config);
    return new CorsFilter(source);
  }
}

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