java - 如何使用 Embedded Tomcat 8 和 Spring boot 将子域转换为路径

Question

如何将子域重写为路径？

例子：

foo.bar .example.com --> example.com /foo/bar

或者更好的是（反向文件夹）：

foo.bar .example.com --> example.com /bar/foo

请求foo.bar .example.com 应该在 /src/main/resources/static/ bar/foo中发送一个文件 /index.html 中发送一个文件。

对于 Apache2，它由mod_rewrite完成。我找到了有关使用Tomcat 8重写的文档，但问题是使用 spring boot 将这些文件放在哪里？

更新

我尝试使用UrlRewriteFilter，但似乎无法使用正则表达式替换在域路径中定义规则。

这是我的配置：

Maven依赖：

<dependency>
    <groupId>org.tuckey</groupId>
    <artifactId>urlrewritefilter</artifactId>
    <version>4.0.3</version>
</dependency>

Spring Java Config 注册 Servlet 过滤器：

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application
{
    public static void main(String[] args)
    {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean()
    {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();

        registrationBean.setFilter(new UrlRewriteFilter());
        registrationBean.addUrlPatterns("*");
        registrationBean.addInitParameter("confReloadCheckInterval", "5");
        registrationBean.addInitParameter("logLevel", "DEBUG");

        return registrationBean;
    }
}

/src/main/webapp/WEB-INF 中的urlrewrite.xml

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE urlrewrite
    PUBLIC "-//tuckey.org//DTD UrlRewrite 4.0//EN"
    "http://www.tuckey.org/res/dtds/urlrewrite4.0.dtd">

<urlrewrite>
    <rule>
        <name>Translate</name>
        <condition name="host" operator="equal">foo.bar.example.com</condition>
        <from>^(.*)</from>
        <to type="redirect">example.com/bar/foo</to>
    </rule>
</urlrewrite>

使用这个硬编码的域它可以工作，但它应该适用于这样的每个子域。

score 8 · Accepted Answer

创建您自己的过滤器。

这个过滤器应该：

检查您是否必须重写您的请求
如果是，重写 URL 和 URI
转发请求
它再次通过相同的过滤器，但第一次检查将提供错误
不要忘记并小心打电话chain.doFilter

转发不会改变浏览器中的任何 URL。只需发送文件内容。

跟随代码可以是这种过滤器的实现。这不是任何一种干净的代码。只是快速而肮脏的工作代码：

@Component
public class SubdomainToReversePathFilter implements Filter {
    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
        final HttpServletRequest req = (HttpServletRequest) request;
        final String requestURI = req.getRequestURI();

        if (!requestURI.endsWith("/")) {
            chain.doFilter(request, response);
        } else {
            final String servername = req.getServerName();
            final Domain domain = getDomain(servername);

            if (domain.hasSubdomain()) {
                final HttpServletRequestWrapper wrapped = wrapServerName(req, domain);
                wrapped.getRequestDispatcher(requestURI + domain.getSubdomainAsPath()).forward(wrapped, response);
            } else {
                chain.doFilter(request, response);
            }
        }
    }

    private Domain getDomain(final String domain) {
        final String[] domainParts = domain.split("\\.");
        String mainDomain;
        String subDomain = null;

        final int dpLength = domainParts.length;
        if (dpLength > 2) {
            mainDomain = domainParts[dpLength - 2] + "." + domainParts[dpLength - 1];

            subDomain = reverseDomain(domainParts);
        } else {
            mainDomain = domain;
        }

        return new Domain(mainDomain, subDomain);
    }
    private HttpServletRequestWrapper wrapServerName(final HttpServletRequest req, final Domain domain) {
        return new HttpServletRequestWrapper(req) {
            @Override
            public String getServerName() {
                return domain.getMaindomain();
            }
            // more changes? getRequesetURL()? ...?
        };
    }

    private String reverseDomain(final String[] domainParts) {
        final List<String> subdomainList = Arrays.stream(domainParts, 0, domainParts.length - 2)//
                .collect(Collectors.toList());

        Collections.reverse(subdomainList);

        return subdomainList.stream().collect(Collectors.joining("."));
    }

    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void destroy() {
    }
}

这是域类：

public static class Domain {
    private final String maindomain;
    private final String subdomain;

    public Domain(final String maindomain, final String subdomain) {
        this.maindomain = maindomain;
        this.subdomain = subdomain;
    }

    public String getMaindomain() {
        return maindomain;
    }

    public String getSubdomain() {
        return subdomain;
    }

    public boolean hasSubdomain() {
        return subdomain != null;
    }

    public String getSubdomainAsPath() {
        return "/" + subdomain.replaceAll("\\.", "/") + "/";
    }
}

你需要一个能捕捉一切的控制器

@RestController
public class CatchAllController {

    @RequestMapping("**")
    public FileSystemResource deliver(final HttpServletRequest request) {
        final String file = ((String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE));

        return new FileSystemResource(getStaticFile(file));
    }

    private File getStaticFile(final String path) {
        try {
            // TODO handle correct
            return new File(CatchAllController.class.getResource("/static/" + path + "/index.html").toURI());
        } catch (final Exception e) {
            throw new RuntimeException("not found");
        }
    }
}

我不确定这是否有必要覆盖HttpServletRequestWrapper. 这就是评论的原因。

您还必须处理文件传递的案例（不存在，...）。

score 4 · Accepted Answer

您可以使用Backreferences在您的<condition>. 像这样的东西-

<condition name="host" operator="equal">(*).(*).example.com</condition>
<from>^(.*)</from>
<to type="redirect">example.com/%1/%2</to>

当然，您必须调整上面的条件规则以停止急切匹配。

更多在这里 - http://urlrewritefilter.googlecode.com/svn/trunk/src/doc/manual/4.0/index.html#condition

score 3 · Accepted Answer

解决此问题的另一种方法：在 Controller 本身中执行。在我看来，这比使用过滤器更好，因为：

过滤器捕获每个请求。在这里，您可以更好地控制应使用“子域模式”传递哪些请求。作为示例，我选择了/subdomain2path.
您不必更改/包装 URI/URL 并再次通过过滤器链转发。
所有逻辑都在这个控制器中

方法getSubdomain和reverseDomain与之前的答案相同。

这是实现：

@RestController
@RequestMapping("/subdomain2path")
public class Subdomain2PathController {

    @RequestMapping("/")
    public FileSystemResource deliver(final HttpServletRequest request) {
        final Domain subdomain = getSubdomain(request.getServerName());

        String file = "/";
        if (subdomain.hasSubdomain()) {
            file = subdomain.getSubdomainAsPath();
        }

        return new FileSystemResource(getStaticFile(file));
    }

    private Domain getSubdomain(final String domain) {
        final String[] domainParts = domain.split("\\.");
        String mainDomain;
        String subDomain = null;

        final int dpLength = domainParts.length;
        if (dpLength > 2) {
            mainDomain = domainParts[dpLength - 2] + "." + domainParts[dpLength - 1];

            subDomain = reverseDomain(domainParts);
        } else {
            mainDomain = domain;
        }

        return new Domain(mainDomain, subDomain);
    }

    private String reverseDomain(final String[] domainParts) {
        final List<String> subdomainList = Arrays.stream(domainParts, 0, domainParts.length - 2)//
                .collect(Collectors.toList());

        Collections.reverse(subdomainList);

        return subdomainList.stream().collect(Collectors.joining("."));
    }

    private File getStaticFile(final String path) {
        try {
            // TODO handle correct
            return new File(Subdomain2PathController.class.getResource("/static/" + path + "/index.html").toURI());
        } catch (final Exception e) {
            throw new RuntimeException("not found");
        }
    }
}

域类与之前的答案相同：

public static class Domain {
    private final String maindomain;
    private final String subdomain;

    public Domain(final String maindomain, final String subdomain) {
        this.maindomain = maindomain;
        this.subdomain = subdomain;
    }

    public String getMaindomain() {
        return maindomain;
    }

    public String getSubdomain() {
        return subdomain;
    }

    public boolean hasSubdomain() {
        return subdomain != null;
    }

    public String getSubdomainAsPath() {
        return "/" + subdomain.replaceAll("\\.", "/") + "/";
    }
}

score -1 · Accepted Answer

It worked for me. Hope it works for others too.

Please use the following dependency

         <dependency>
           <groupId>org.tuckey</groupId>
           <artifactId>urlrewritefilter</artifactId>
           <version>4.0.4</version>
         </dependency>

Created urlrewrite.xml in resource folder

 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE urlrewrite
    PUBLIC "-//tuckey.org//DTD UrlRewrite 3.0//EN"
    "http://www.tuckey.org/res/dtds/urlrewrite3.0.dtd">

<urlrewrite>
<rule>
    <name>Domain Name Check</name>
    <condition name="host" operator="notequal">www.userdomain.com</condition>
    <from>^(.*)$</from>
    <to type="redirect">http://www.userdomain.com$1</to>
</rule>

Added in main ApplicationRunner.java

@Bean
public FilterRegistrationBean tuckeyRegistrationBean() {
    final FilterRegistrationBean registrationBean = new FilterRegistrationBean();
    registrationBean.setFilter(new CustomURLRewriter());
    return registrationBean;
}

And created a CustomURLRewriter

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ClassPathResource;
import org.tuckey.web.filters.urlrewrite.Conf;
import org.tuckey.web.filters.urlrewrite.UrlRewriteFilter;
import org.tuckey.web.filters.urlrewrite.UrlRewriter;
import javax.servlet.*;
import java.io.InputStream;

public class CustomURLRewriter extends UrlRewriteFilter {
private UrlRewriter urlRewriter;

@Autowired
Environment env;

@Override
public void loadUrlRewriter(FilterConfig filterConfig) throws ServletException {
    try {
        ClassPathResource classPathResource = new ClassPathResource("urlrewrite.xml");
        InputStream inputStream = classPathResource.getInputStream();
        Conf conf1 = new Conf(filterConfig.getServletContext(), inputStream, "urlrewrite.xml", "");
        urlRewriter = new UrlRewriter(conf1);
    } catch (Exception e) {
        throw new ServletException(e);
    }
}

@Override
public UrlRewriter getUrlRewriter(ServletRequest request, ServletResponse response, FilterChain chain) {
    return urlRewriter;
}

@Override
public void destroyUrlRewriter() {
    if(urlRewriter != null)
        urlRewriter.destroy();
}
}

java - 如何使用 Embedded Tomcat 8 和 Spring boot 将子域转换为路径

4 回答 4

It worked for me. Hope it works for others too.

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