覆盖CORS配置

Question

我部署了一个基于OSGi示例的叶片CLI blade.rest模块，并对其进行了修改，以返回响应而不是纯文本。这是一堂课：

package com.autentia.api.rest.users;

import org.osgi.service.component.annotations.Component;
import javax.servlet.http.HttpServletRequest;


import javax.ws.rs.ApplicationPath;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.Collections;
import java.util.Set;

@ApplicationPath("/users")
@Component(
        immediate = true, property = {"jaxrs.application=true"},
        service = Application.class
)
public class UsersRestService extends Application {

    @Override
    public Set<Object> getSingletons() {
        return Collections.singleton(this);
    }

    @GET
    @Path("/")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getUsers(@Context HttpServletRequest request) {
        System.out.println(request.getRemoteAddr());
        String json = "{\n" + "  \"value\": \"ok\"\n" + "}";
        return Response
                .status(200)
                .header("Access-Control-Allow-Origin", "*")
                .entity(json)
                .build();
    }
}

(如果删除.header("Access-Control-Allow-Origin", "*")，则此操作在本地有效。)

当我向服务器请愿时，响应有两个访问控制-访问-原产地属性，一个设置为"*“(这正是我想要的)，另一个设置为发送它的ip。答复如下：

Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:http://localhost:3000
Access-Control-Allow-Origin:*
Content-Length:19
Content-Type:application/json
Date:Wed, 12 Apr 2017 15:23:38 GMT
Server:Apache-Coyote/1.1
Set-Cookie:JSESSIONID=CF771CD0FAECDAF226D153FB05875CC3; Path=/; HttpOnly
X-Content-Type-Options:nosniff
X-Frame-Options:SAMEORIGIN
X-Request-URL:http://localhost:8080/o/api/users
X-XSS-Protection:1

如您所见，有两个访问控制-允许-起源，这是不被接受的。我该从哪里开始找呢？我应该修改Tomcat的web.xml吗？我已经查看过portal.properties和system.properties，但还没有看到启用该标头的属性。

谢谢。

Answer 1

在您的CorsFilter中查找CATALINA_BASE/conf/web.xml过滤器

过滤器有文档。

若要允许来自任何来源的请求，可以将其添加到该文件中：

<init-param>
  <param-name>cors.allowed.origins</param-name>
  <param-value>*</param-value>
</init-param>

Answer 2

正如@sideshowbarker提到的，关键是编辑位于Liferay嵌入式Tomcat上的web.xml文件。我应用的配置如下：

<filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
    <init-param>
        <param-name>cors.allowed.origins</param-name>
        <param-value>http://localhost:49227</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.methods</param-name>
        <param-value>GET,POST,HEAD,OPTIONS,PUT</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.headers</param-name>
        <param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
    </init-param>
    <init-param>
        <param-name>cors.exposed.headers</param-name>
        <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
    </init-param>
    <init-param>
        <param-name>cors.support.credentials</param-name>
        <param-value>true</param-value>
    </init-param>
    <init-param>
        <param-name>cors.preflight.maxage</param-name>
        <param-value>10</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

之后，我从我使用的getUsers方法的响应中删除了头，并重新启动了Tomcat，从而应用了配置。

如果我想允许所有的起源或白名单If，我将不得不更改以下param

<init-param>
    <param-name>cors.allowed.origins</param-name>
    <param-value>http://<IP_TO_WHITELIST>:<PORT></param-value>
</init-param>

或允许所有来源：

<init-param>
    <param-name>cors.allowed.origins</param-name>
    <param-value>*</param-value>
</init-param>