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}.
 *
 * <p>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.
 *
 * <p>this filter could be used in conjunction with {@link delegatingfilterproxy}
 * in order to help with its initialization.
 *
 * @author sebastien deleuze
 * @since 4.2
 * @see <a href="https://www.w3.org/tr/cors/" rel="external nofollow" >cors w3c recommendation</a>
 * @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.
	 * <p>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<string> 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 <em>all</em> 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<string> 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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